Merge remote branch 'origin/master'

24 files changed, 1760 insertions, 1517 deletions

diff --git a/src/opengl/gl2paintengineex/qglcustomshaderstage_p.h b/src/opengl/gl2paintengineex/qglcustomshaderstage_p.h
index e319389..e0033be 100644
--- a/src/opengl/gl2paintengineex/qglcustomshaderstage_p.h
+++ b/src/opengl/gl2paintengineex/qglcustomshaderstage_p.h
@@ -68,7 +68,7 @@ class Q_OPENGL_EXPORT QGLCustomShaderStage
 public:
     QGLCustomShaderStage();
     virtual ~QGLCustomShaderStage();
-    virtual void setUniforms(QGLShaderProgram*) = 0;
+    virtual void setUniforms(QGLShaderProgram*) {}
 
     void setUniformsDirty();
 
diff --git a/src/opengl/gl2paintengineex/qglengineshadermanager.cpp b/src/opengl/gl2paintengineex/qglengineshadermanager.cpp
index 8a8f483..326ea1f 100644
--- a/src/opengl/gl2paintengineex/qglengineshadermanager.cpp
+++ b/src/opengl/gl2paintengineex/qglengineshadermanager.cpp
@@ -170,13 +170,15 @@ QGLEngineSharedShaders::QGLEngineSharedShaders(const QGLContext* context)
     source.append(qShaderSnippets[MainVertexShader]);
     source.append(qShaderSnippets[PositionOnlyVertexShader]);
     vertexShader = new QGLShader(QGLShader::Vertex, context, this);
-    vertexShader->compileSourceCode(source);
+    if (!vertexShader->compileSourceCode(source))
+        qWarning("Vertex shader for simpleShaderProg (MainVertexShader & PositionOnlyVertexShader) failed to compile");
 
     source.clear();
     source.append(qShaderSnippets[MainFragmentShader]);
     source.append(qShaderSnippets[ShockingPinkSrcFragmentShader]);
     fragShader = new QGLShader(QGLShader::Fragment, context, this);
-    fragShader->compileSourceCode(source);
+    if (!fragShader->compileSourceCode(source))
+        qWarning("Fragment shader for simpleShaderProg (MainFragmentShader & ShockingPinkSrcFragmentShader) failed to compile");
 
     simpleShaderProg = new QGLShaderProgram(context, this);
     simpleShaderProg->addShader(vertexShader);
@@ -193,13 +195,15 @@ QGLEngineSharedShaders::QGLEngineSharedShaders(const QGLContext* context)
     source.append(qShaderSnippets[MainWithTexCoordsVertexShader]);
     source.append(qShaderSnippets[UntransformedPositionVertexShader]);
     vertexShader = new QGLShader(QGLShader::Vertex, context, this);
-    vertexShader->compileSourceCode(source);
+    if (!vertexShader->compileSourceCode(source))
+        qWarning("Vertex shader for blitShaderProg (MainWithTexCoordsVertexShader & UntransformedPositionVertexShader) failed to compile");
 
     source.clear();
     source.append(qShaderSnippets[MainFragmentShader]);
     source.append(qShaderSnippets[ImageSrcFragmentShader]);
     fragShader = new QGLShader(QGLShader::Fragment, context, this);
-    fragShader->compileSourceCode(source);
+    if (!fragShader->compileSourceCode(source))
+        qWarning("Fragment shader for blitShaderProg (MainFragmentShader & ImageSrcFragmentShader) failed to compile");
 
     blitShaderProg = new QGLShaderProgram(context, this);
     blitShaderProg->addShader(vertexShader);
@@ -214,6 +218,23 @@ QGLEngineSharedShaders::QGLEngineSharedShaders(const QGLContext* context)
 
 }
 
+QGLEngineSharedShaders::~QGLEngineSharedShaders()
+{
+    QList<QGLEngineShaderProg*>::iterator itr;
+    for (itr = cachedPrograms.begin(); itr != cachedPrograms.end(); ++itr)
+        delete *itr;
+
+    if (blitShaderProg) {
+        delete blitShaderProg;
+        blitShaderProg = 0;
+    }
+
+    if (simpleShaderProg) {
+        delete simpleShaderProg;
+        simpleShaderProg = 0;
+    }
+}
+
 #if defined (QT_DEBUG)
 QByteArray QGLEngineSharedShaders::snippetNameStr(SnippetName name)
 {
@@ -234,84 +255,95 @@ QGLEngineShaderProg *QGLEngineSharedShaders::findProgramInCache(const QGLEngineS
         }
     }
 
-    QByteArray source;
-    source.append(qShaderSnippets[prog.mainFragShader]);
-    source.append(qShaderSnippets[prog.srcPixelFragShader]);
-    if (prog.srcPixelFragShader == CustomImageSrcFragmentShader)
-        source.append(prog.customStageSource);
-    if (prog.compositionFragShader)
-        source.append(qShaderSnippets[prog.compositionFragShader]);
-    if (prog.maskFragShader)
-        source.append(qShaderSnippets[prog.maskFragShader]);
-    QGLShader* fragShader = new QGLShader(QGLShader::Fragment, ctxGuard.context(), this);
-    fragShader->compileSourceCode(source);
-
-    source.clear();
-    source.append(qShaderSnippets[prog.mainVertexShader]);
-    source.append(qShaderSnippets[prog.positionVertexShader]);
-    QGLShader* vertexShader = new QGLShader(QGLShader::Vertex, ctxGuard.context(), this);
-    vertexShader->compileSourceCode(source);
+    QGLShader *vertexShader = 0;
+    QGLShader *fragShader = 0;
+    QGLEngineShaderProg *newProg = 0;
+    bool success = false;
+
+    do {
+        QByteArray source;
+        source.append(qShaderSnippets[prog.mainFragShader]);
+        source.append(qShaderSnippets[prog.srcPixelFragShader]);
+        if (prog.srcPixelFragShader == CustomImageSrcFragmentShader)
+            source.append(prog.customStageSource);
+        if (prog.compositionFragShader)
+            source.append(qShaderSnippets[prog.compositionFragShader]);
+        if (prog.maskFragShader)
+            source.append(qShaderSnippets[prog.maskFragShader]);
+        fragShader = new QGLShader(QGLShader::Fragment, ctxGuard.context(), this);
+        QByteArray description;
+#if defined(QT_DEBUG)
+        // Name the shader for easier debugging
+        description.append("Fragment shader: main=");
+        description.append(snippetNameStr(prog.mainFragShader));
+        description.append(", srcPixel=");
+        description.append(snippetNameStr(prog.srcPixelFragShader));
+        if (prog.compositionFragShader) {
+            description.append(", composition=");
+            description.append(snippetNameStr(prog.compositionFragShader));
+        }
+        if (prog.maskFragShader) {
+            description.append(", mask=");
+            description.append(snippetNameStr(prog.maskFragShader));
+        }
+        fragShader->setObjectName(QString::fromLatin1(description));
+#endif
+        if (!fragShader->compileSourceCode(source)) {
+            qWarning() << "Warning:" << description << "failed to compile!";
+            break;
+        }
 
+        source.clear();
+        source.append(qShaderSnippets[prog.mainVertexShader]);
+        source.append(qShaderSnippets[prog.positionVertexShader]);
+        vertexShader = new QGLShader(QGLShader::Vertex, ctxGuard.context(), this);
 #if defined(QT_DEBUG)
-    // Name the shaders for easier debugging
-    QByteArray description;
-    description.append("Fragment shader: main=");
-    description.append(snippetNameStr(prog.mainFragShader));
-    description.append(", srcPixel=");
-    description.append(snippetNameStr(prog.srcPixelFragShader));
-    if (prog.compositionFragShader) {
-        description.append(", composition=");
-        description.append(snippetNameStr(prog.compositionFragShader));
-    }
-    if (prog.maskFragShader) {
-        description.append(", mask=");
-        description.append(snippetNameStr(prog.maskFragShader));
-    }
-    fragShader->setObjectName(QString::fromLatin1(description));
-
-    description.clear();
-    description.append("Vertex shader: main=");
-    description.append(snippetNameStr(prog.mainVertexShader));
-    description.append(", position=");
-    description.append(snippetNameStr(prog.positionVertexShader));
-    vertexShader->setObjectName(QString::fromLatin1(description));
+        // Name the shader for easier debugging
+        description.clear();
+        description.append("Vertex shader: main=");
+        description.append(snippetNameStr(prog.mainVertexShader));
+        description.append(", position=");
+        description.append(snippetNameStr(prog.positionVertexShader));
+        vertexShader->setObjectName(QString::fromLatin1(description));
 #endif
+        if (!vertexShader->compileSourceCode(source)) {
+            qWarning() << "Warning:" << description << "failed to compile!";
+            break;
+        }
 
-    QGLEngineShaderProg* newProg = new QGLEngineShaderProg(prog);
-
-    // If the shader program's not found in the cache, create it now.
-    newProg->program = new QGLShaderProgram(ctxGuard.context(), this);
-    newProg->program->addShader(vertexShader);
-    newProg->program->addShader(fragShader);
-
-    // We have to bind the vertex attribute names before the program is linked:
-    newProg->program->bindAttributeLocation("vertexCoordsArray", QT_VERTEX_COORDS_ATTR);
-    if (newProg->useTextureCoords)
-        newProg->program->bindAttributeLocation("textureCoordArray", QT_TEXTURE_COORDS_ATTR);
-    if (newProg->useOpacityAttribute)
-        newProg->program->bindAttributeLocation("opacityArray", QT_OPACITY_ATTR);
-
-    newProg->program->link();
-    if (!newProg->program->isLinked()) {
-        QLatin1String none("none");
-        QLatin1String br("\n");
-        QString error;
-        error = QLatin1String("Shader program failed to link,")
+        newProg = new QGLEngineShaderProg(prog);
+
+        // If the shader program's not found in the cache, create it now.
+        newProg->program = new QGLShaderProgram(ctxGuard.context(), this);
+        newProg->program->addShader(vertexShader);
+        newProg->program->addShader(fragShader);
+
+        // We have to bind the vertex attribute names before the program is linked:
+        newProg->program->bindAttributeLocation("vertexCoordsArray", QT_VERTEX_COORDS_ATTR);
+        if (newProg->useTextureCoords)
+            newProg->program->bindAttributeLocation("textureCoordArray", QT_TEXTURE_COORDS_ATTR);
+        if (newProg->useOpacityAttribute)
+            newProg->program->bindAttributeLocation("opacityArray", QT_OPACITY_ATTR);
+
+        newProg->program->link();
+        if (!newProg->program->isLinked()) {
+            QLatin1String none("none");
+            QLatin1String br("\n");
+            QString error;
+            error = QLatin1String("Shader program failed to link,")
 #if defined(QT_DEBUG)
-            + br
-            + QLatin1String("  Shaders Used:") + br
-            + QLatin1String("    ") + vertexShader->objectName() + QLatin1String(": ") + br
-            + QLatin1String(vertexShader->sourceCode()) + br
-            + QLatin1String("    ") + fragShader->objectName() + QLatin1String(": ") + br
-            + QLatin1String(fragShader->sourceCode()) + br
+                + br
+                + QLatin1String("  Shaders Used:") + br
+                + QLatin1String("    ") + vertexShader->objectName() + QLatin1String(": ") + br
+                + QLatin1String(vertexShader->sourceCode()) + br
+                + QLatin1String("    ") + fragShader->objectName() + QLatin1String(": ") + br
+                + QLatin1String(fragShader->sourceCode()) + br
 #endif
-            + QLatin1String("  Error Log:\n")
-            + QLatin1String("    ") + newProg->program->log();
-        qWarning() << error;
-        delete newProg; // Deletes the QGLShaderProgram in it's destructor
-        newProg = 0;
-    }
-    else {
+                + QLatin1String("  Error Log:\n")
+                + QLatin1String("    ") + newProg->program->log();
+            qWarning() << error;
+            break;
+        }
         if (cachedPrograms.count() > 30) {
             // The cache is full, so delete the last 5 programs in the list.
             // These programs will be least used, as a program us bumped to
@@ -323,6 +355,22 @@ QGLEngineShaderProg *QGLEngineSharedShaders::findProgramInCache(const QGLEngineS
         }
 
         cachedPrograms.insert(0, newProg);
+
+        success = true;
+    } while (false);
+
+    // Clean up everything if we weren't successful
+    if (!success) {
+        if (newProg) {
+            delete newProg; // Also deletes the QGLShaderProgram which in turn deletes the QGLShaders
+            newProg = 0;
+        }
+        else {
+            if (vertexShader)
+                delete vertexShader;
+            if (fragShader)
+                delete fragShader;
+        }
     }
 
     return newProg;
@@ -362,8 +410,11 @@ QGLEngineShaderManager::~QGLEngineShaderManager()
     removeCustomStage();
 }
 
-uint QGLEngineShaderManager::getUniformLocation(Uniform id)
+GLuint QGLEngineShaderManager::getUniformLocation(Uniform id)
 {
+    if (!currentShaderProg)
+        return 0;
+
     QVector<uint> &uniformLocations = currentShaderProg->uniformLocations;
     if (uniformLocations.isEmpty())
         uniformLocations.fill(GLuint(-1), NumUniforms);
@@ -394,9 +445,9 @@ uint QGLEngineShaderManager::getUniformLocation(Uniform id)
 }
 
 
-void QGLEngineShaderManager::optimiseForBrushTransform(const QTransform &transform)
+void QGLEngineShaderManager::optimiseForBrushTransform(QTransform::TransformationType transformType)
 {
-    Q_UNUSED(transform); // Currently ignored
+    Q_UNUSED(transformType); // Currently ignored
 }
 
 void QGLEngineShaderManager::setDirty()
@@ -406,6 +457,7 @@ void QGLEngineShaderManager::setDirty()
 
 void QGLEngineShaderManager::setSrcPixelType(Qt::BrushStyle style)
 {
+    Q_ASSERT(style != Qt::NoBrush);
     if (srcPixelType == PixelSrcType(style))
         return;
 
@@ -467,7 +519,30 @@ void QGLEngineShaderManager::removeCustomStage()
 
 QGLShaderProgram* QGLEngineShaderManager::currentProgram()
 {
-    return currentShaderProg->program;
+    if (currentShaderProg)
+        return currentShaderProg->program;
+    else
+        return sharedShaders->simpleProgram();
+}
+
+void QGLEngineShaderManager::useSimpleProgram()
+{
+    sharedShaders->simpleProgram()->bind();
+    QGLContextPrivate* ctx_d = ctx->d_func();
+    ctx_d->setVertexAttribArrayEnabled(QT_VERTEX_COORDS_ATTR, true);
+    ctx_d->setVertexAttribArrayEnabled(QT_TEXTURE_COORDS_ATTR, false);
+    ctx_d->setVertexAttribArrayEnabled(QT_OPACITY_ATTR, false);
+    shaderProgNeedsChanging = true;
+}
+
+void QGLEngineShaderManager::useBlitProgram()
+{
+    sharedShaders->blitProgram()->bind();
+    QGLContextPrivate* ctx_d = ctx->d_func();
+    ctx_d->setVertexAttribArrayEnabled(QT_VERTEX_COORDS_ATTR, true);
+    ctx_d->setVertexAttribArrayEnabled(QT_TEXTURE_COORDS_ATTR, true);
+    ctx_d->setVertexAttribArrayEnabled(QT_OPACITY_ATTR, false);
+    shaderProgNeedsChanging = true;
 }
 
 QGLShaderProgram* QGLEngineShaderManager::simpleProgram()
@@ -678,6 +753,13 @@ bool QGLEngineShaderManager::useCorrectShaderProg()
             customSrcStage->setUniforms(currentShaderProg->program);
     }
 
+    // Make sure all the vertex attribute arrays the program uses are enabled (and the ones it
+    // doesn't use are disabled)
+    QGLContextPrivate* ctx_d = ctx->d_func();
+    ctx_d->setVertexAttribArrayEnabled(QT_VERTEX_COORDS_ATTR, true);
+    ctx_d->setVertexAttribArrayEnabled(QT_TEXTURE_COORDS_ATTR, currentShaderProg->useTextureCoords);
+    ctx_d->setVertexAttribArrayEnabled(QT_OPACITY_ATTR, currentShaderProg->useOpacityAttribute);
+
     shaderProgNeedsChanging = false;
     return true;
 }
diff --git a/src/opengl/gl2paintengineex/qglengineshadermanager_p.h b/src/opengl/gl2paintengineex/qglengineshadermanager_p.h
index 50c1432..a3464d4 100644
--- a/src/opengl/gl2paintengineex/qglengineshadermanager_p.h
+++ b/src/opengl/gl2paintengineex/qglengineshadermanager_p.h
@@ -344,6 +344,7 @@ public:
 */
 
     QGLEngineSharedShaders(const QGLContext *context);
+    ~QGLEngineSharedShaders();
 
     QGLShaderProgram *simpleProgram() { return simpleShaderProg; }
     QGLShaderProgram *blitProgram() { return blitShaderProg; }
@@ -454,7 +455,7 @@ public:
     // There are optimisations we can do, depending on the brush transform:
     //    1) May not have to apply perspective-correction
     //    2) Can use lower precision for matrix
-    void optimiseForBrushTransform(const QTransform &transform);
+    void optimiseForBrushTransform(QTransform::TransformationType transformType);
     void setSrcPixelType(Qt::BrushStyle);
     void setSrcPixelType(PixelSrcType); // For non-brush sources, like pixmaps & images
     void setOpacityMode(OpacityMode);
@@ -463,11 +464,14 @@ public:
     void setCustomStage(QGLCustomShaderStage* stage);
     void removeCustomStage();
 
-    uint getUniformLocation(Uniform id);
+    GLuint getUniformLocation(Uniform id);
 
     void setDirty(); // someone has manually changed the current shader program
     bool useCorrectShaderProg(); // returns true if the shader program needed to be changed
 
+    void useSimpleProgram();
+    void useBlitProgram();
+
     QGLShaderProgram* currentProgram(); // Returns pointer to the shader the manager has chosen
     QGLShaderProgram* simpleProgram(); // Used to draw into e.g. stencil buffers
     QGLShaderProgram* blitProgram(); // Used to blit a texture into the framebuffer
diff --git a/src/opengl/gl2paintengineex/qglengineshadersource_p.h b/src/opengl/gl2paintengineex/qglengineshadersource_p.h
index 2407979..46de124 100644
--- a/src/opengl/gl2paintengineex/qglengineshadersource_p.h
+++ b/src/opengl/gl2paintengineex/qglengineshadersource_p.h
@@ -99,12 +99,15 @@ static const char* const qglslMainWithTexCoordsAndOpacityVertexShader = "\
             opacity = opacityArray; \
     }";
 
+// NOTE: We let GL do the perspective correction so texture lookups in the fragment
+//       shader are also perspective corrected.
 static const char* const qglslPositionOnlyVertexShader = "\
-    attribute highp vec4    vertexCoordsArray;\
-    uniform   highp mat4    pmvMatrix;\
+    attribute highp vec2    vertexCoordsArray;\
+    uniform   highp mat3    pmvMatrix;\
     void setPosition(void)\
     {\
-            gl_Position = pmvMatrix * vertexCoordsArray;\
+        vec3 transformedPos = pmvMatrix * vec3(vertexCoordsArray.xy, 1.0); \
+        gl_Position = vec4(transformedPos.xy, 0.0, transformedPos.z); \
     }";
 
 static const char* const qglslUntransformedPositionVertexShader = "\
@@ -116,20 +119,19 @@ static const char* const qglslUntransformedPositionVertexShader = "\
 
 // Pattern Brush - This assumes the texture size is 8x8 and thus, the inverted size is 0.125
 static const char* const qglslPositionWithPatternBrushVertexShader = "\
-    attribute highp   vec4  vertexCoordsArray; \
-    uniform   highp   mat4  pmvMatrix; \
+    attribute highp   vec2  vertexCoordsArray; \
+    uniform   highp   mat3  pmvMatrix; \
     uniform   mediump vec2  halfViewportSize; \
     uniform   highp   vec2  invertedTextureSize; \
     uniform   highp   mat3  brushTransform; \
     varying   highp   vec2  patternTexCoords; \
     void setPosition(void) { \
-            gl_Position = pmvMatrix * vertexCoordsArray;\
-            gl_Position.xy = gl_Position.xy / gl_Position.w; \
+            vec3 transformedPos = pmvMatrix * vec3(vertexCoordsArray.xy, 1.0); \
+            gl_Position.xy = transformedPos.xy / transformedPos.z; \
             mediump vec2 viewportCoords = (gl_Position.xy + 1.0) * halfViewportSize; \
-            mediump vec3 hTexCoords = brushTransform * vec3(viewportCoords, 1); \
+            mediump vec3 hTexCoords = brushTransform * vec3(viewportCoords, 1.0); \
             mediump float invertedHTexCoordsZ = 1.0 / hTexCoords.z; \
-            gl_Position.xy = gl_Position.xy * invertedHTexCoordsZ; \
-            gl_Position.w = invertedHTexCoordsZ; \
+            gl_Position = vec4(gl_Position.xy * invertedHTexCoordsZ, 0.0, invertedHTexCoordsZ); \
             patternTexCoords.xy = (hTexCoords.xy * 0.125) * invertedHTexCoordsZ; \
     }";
 
@@ -147,20 +149,19 @@ static const char* const qglslPatternBrushSrcFragmentShader = "\
 
 // Linear Gradient Brush
 static const char* const qglslPositionWithLinearGradientBrushVertexShader = "\
-    attribute highp   vec4  vertexCoordsArray; \
-    uniform   highp   mat4  pmvMatrix; \
+    attribute highp   vec2  vertexCoordsArray; \
+    uniform   highp   mat3  pmvMatrix; \
     uniform   mediump vec2  halfViewportSize; \
     uniform   highp   vec3  linearData; \
     uniform   highp   mat3  brushTransform; \
     varying   mediump float index; \
     void setPosition() { \
-        gl_Position = pmvMatrix * vertexCoordsArray;\
-        gl_Position.xy = gl_Position.xy / gl_Position.w; \
+        vec3 transformedPos = pmvMatrix * vec3(vertexCoordsArray.xy, 1.0); \
+        gl_Position.xy = transformedPos.xy / transformedPos.z; \
         mediump vec2 viewportCoords = (gl_Position.xy + 1.0) * halfViewportSize; \
         mediump vec3 hTexCoords = brushTransform * vec3(viewportCoords, 1); \
         mediump float invertedHTexCoordsZ = 1.0 / hTexCoords.z; \
-        gl_Position.xy = gl_Position.xy * invertedHTexCoordsZ; \
-        gl_Position.w = invertedHTexCoordsZ; \
+        gl_Position = vec4(gl_Position.xy * invertedHTexCoordsZ, 0.0, invertedHTexCoordsZ); \
         index = (dot(linearData.xy, hTexCoords.xy) * linearData.z) * invertedHTexCoordsZ; \
     }";
 
@@ -178,20 +179,19 @@ static const char* const qglslLinearGradientBrushSrcFragmentShader = "\
 
 // Conical Gradient Brush
 static const char* const qglslPositionWithConicalGradientBrushVertexShader = "\
-    attribute highp   vec4  vertexCoordsArray;\
-    uniform   highp   mat4  pmvMatrix;\
+    attribute highp   vec2  vertexCoordsArray;\
+    uniform   highp   mat3  pmvMatrix;\
     uniform   mediump vec2  halfViewportSize; \
     uniform   highp   mat3  brushTransform; \
     varying   highp   vec2  A; \
     void setPosition(void)\
     {\
-        gl_Position = pmvMatrix * vertexCoordsArray;\
-        gl_Position.xy = gl_Position.xy / gl_Position.w; \
+        vec3 transformedPos = pmvMatrix * vec3(vertexCoordsArray.xy, 1.0); \
+        gl_Position.xy = transformedPos.xy / transformedPos.z; \
         mediump vec2  viewportCoords = (gl_Position.xy + 1.0) * halfViewportSize; \
         mediump vec3 hTexCoords = brushTransform * vec3(viewportCoords, 1); \
         mediump float invertedHTexCoordsZ = 1.0 / hTexCoords.z; \
-        gl_Position.xy = gl_Position.xy * invertedHTexCoordsZ; \
-        gl_Position.w = invertedHTexCoordsZ; \
+        gl_Position = vec4(gl_Position.xy * invertedHTexCoordsZ, 0.0, invertedHTexCoordsZ); \
         A = hTexCoords.xy * invertedHTexCoordsZ; \
     }";
 
@@ -215,8 +215,8 @@ static const char* const qglslConicalGradientBrushSrcFragmentShader = "\n\
 
 // Radial Gradient Brush
 static const char* const qglslPositionWithRadialGradientBrushVertexShader = "\
-    attribute highp   vec4 vertexCoordsArray;\
-    uniform   highp   mat4 pmvMatrix;\
+    attribute highp   vec2 vertexCoordsArray;\
+    uniform   highp   mat3 pmvMatrix;\
     uniform   mediump vec2 halfViewportSize; \
     uniform   highp   mat3 brushTransform; \
     uniform   highp   vec2 fmp; \
@@ -224,13 +224,12 @@ static const char* const qglslPositionWithRadialGradientBrushVertexShader = "\
     varying   highp   vec2  A; \
     void setPosition(void) \
     {\
-        gl_Position = pmvMatrix * vertexCoordsArray;\
-        gl_Position.xy = gl_Position.xy / gl_Position.w; \
+        vec3 transformedPos = pmvMatrix * vec3(vertexCoordsArray.xy, 1.0); \
+        gl_Position.xy = transformedPos.xy / transformedPos.z; \
         mediump vec2 viewportCoords = (gl_Position.xy + 1.0) * halfViewportSize; \
         mediump vec3 hTexCoords = brushTransform * vec3(viewportCoords, 1); \
         mediump float invertedHTexCoordsZ = 1.0 / hTexCoords.z; \
-        gl_Position.xy = gl_Position.xy * invertedHTexCoordsZ; \
-        gl_Position.w = invertedHTexCoordsZ; \
+        gl_Position = vec4(gl_Position.xy * invertedHTexCoordsZ, 0.0, invertedHTexCoordsZ); \
         A = hTexCoords.xy * invertedHTexCoordsZ; \
         b = 2.0 * dot(A, fmp); \
     }";
@@ -253,20 +252,19 @@ static const char* const qglslRadialGradientBrushSrcFragmentShader = "\
 
 // Texture Brush
 static const char* const qglslPositionWithTextureBrushVertexShader = "\
-    attribute highp   vec4  vertexCoordsArray; \
-    uniform   highp   mat4  pmvMatrix; \
+    attribute highp   vec2 vertexCoordsArray; \
+    uniform   highp   mat3  pmvMatrix; \
     uniform   mediump vec2  halfViewportSize; \
     uniform   highp   vec2  invertedTextureSize; \
     uniform   highp   mat3  brushTransform; \
     varying   highp   vec2  textureCoords; \
     void setPosition(void) { \
-            gl_Position = pmvMatrix * vertexCoordsArray;\
-            gl_Position.xy = gl_Position.xy / gl_Position.w; \
+            vec3 transformedPos = pmvMatrix * vec3(vertexCoordsArray.xy, 1.0); \
+            gl_Position.xy = transformedPos.xy / transformedPos.z; \
             mediump vec2 viewportCoords = (gl_Position.xy + 1.0) * halfViewportSize; \
             mediump vec3 hTexCoords = brushTransform * vec3(viewportCoords, 1); \
             mediump float invertedHTexCoordsZ = 1.0 / hTexCoords.z; \
-            gl_Position.xy = gl_Position.xy * invertedHTexCoordsZ; \
-            gl_Position.w = invertedHTexCoordsZ; \
+            gl_Position = vec4(gl_Position.xy * invertedHTexCoordsZ, 0.0, invertedHTexCoordsZ); \
             textureCoords.xy = (hTexCoords.xy * invertedTextureSize) * gl_Position.w; \
     }";
 
diff --git a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
index 8fa8171..c411ba2 100644
--- a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
+++ b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
@@ -75,7 +75,6 @@
 #include <QPaintEngine>
 #include <private/qpainter_p.h>
 #include <private/qfontengine_p.h>
-#include <private/qtextureglyphcache_p.h>
 #include <private/qpixmapdata_gl_p.h>
 #include <private/qdatabuffer_p.h>
 #include <private/qtriangulator_p.h>
@@ -83,8 +82,8 @@
 #include "qglgradientcache_p.h"
 #include "qglengineshadermanager_p.h"
 #include "qgl2pexvertexarray_p.h"
-
 #include "qtriangulatingstroker_p.h"
+#include "qtextureglyphcache_gl_p.h"
 
 #include <QDebug>
 
@@ -92,254 +91,6 @@ QT_BEGIN_NAMESPACE
 
 //#define QT_GL_NO_SCISSOR_TEST
 
-static const GLuint GL_STENCIL_HIGH_BIT         = 0x80;
-static const GLuint QT_BRUSH_TEXTURE_UNIT       = 0;
-static const GLuint QT_IMAGE_TEXTURE_UNIT       = 0; //Can be the same as brush texture unit
-static const GLuint QT_MASK_TEXTURE_UNIT        = 1;
-static const GLuint QT_BACKGROUND_TEXTURE_UNIT  = 2;
-
-#ifdef Q_WS_WIN
-extern Q_GUI_EXPORT bool qt_cleartype_enabled;
-#endif
-
-class QGLTextureGlyphCache : public QObject, public QTextureGlyphCache
-{
-    Q_OBJECT
-public:
-    QGLTextureGlyphCache(QGLContext *context, QFontEngineGlyphCache::Type type, const QTransform &matrix);
-    ~QGLTextureGlyphCache();
-
-    virtual void createTextureData(int width, int height);
-    virtual void resizeTextureData(int width, int height);
-    virtual void fillTexture(const Coord &c, glyph_t glyph);
-    virtual int glyphMargin() const;
-
-    inline GLuint texture() const { return m_texture; }
-
-    inline int width() const { return m_width; }
-    inline int height() const { return m_height; }
-
-    inline void setPaintEnginePrivate(QGL2PaintEngineExPrivate *p) { pex = p; }
-
-
-public Q_SLOTS:
-    void contextDestroyed(const QGLContext *context) {
-        if (context == ctx) {
-            QList<const QGLContext *> shares = qgl_share_reg()->shares(ctx);
-            if (shares.isEmpty()) {
-                glDeleteFramebuffers(1, &m_fbo);
-                if (m_width || m_height)
-                    glDeleteTextures(1, &m_texture);
-                ctx = 0;
-            } else {
-                // since the context holding the texture is shared, and
-                // about to be destroyed, we have to transfer ownership
-                // of the texture to one of the share contexts
-                ctx = const_cast<QGLContext *>((ctx == shares.at(0)) ? shares.at(1) : shares.at(0));
-            }
-        }
-    }
-
-private:
-    QGLContext *ctx;
-
-    QGL2PaintEngineExPrivate *pex;
-
-    GLuint m_texture;
-    GLuint m_fbo;
-
-    int m_width;
-    int m_height;
-
-    QGLShaderProgram *m_program;
-};
-
-QGLTextureGlyphCache::QGLTextureGlyphCache(QGLContext *context, QFontEngineGlyphCache::Type type, const QTransform &matrix)
-    : QTextureGlyphCache(type, matrix)
-    , ctx(context)
-    , m_width(0)
-    , m_height(0)
-{
-    glGenFramebuffers(1, &m_fbo);
-    connect(QGLSignalProxy::instance(), SIGNAL(aboutToDestroyContext(const QGLContext*)),
-            SLOT(contextDestroyed(const QGLContext*)));
-}
-
-QGLTextureGlyphCache::~QGLTextureGlyphCache()
-{
-    if (ctx) {
-        QGLShareContextScope scope(ctx);
-        glDeleteFramebuffers(1, &m_fbo);
-
-        if (m_width || m_height)
-            glDeleteTextures(1, &m_texture);
-    }
-}
-
-void QGLTextureGlyphCache::createTextureData(int width, int height)
-{
-    glGenTextures(1, &m_texture);
-    glBindTexture(GL_TEXTURE_2D, m_texture);
-
-    m_width = width;
-    m_height = height;
-
-    QVarLengthArray<uchar> data(width * height);
-    for (int i = 0; i < data.size(); ++i)
-        data[i] = 0;
-
-    if (m_type == QFontEngineGlyphCache::Raster_RGBMask)
-        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, &data[0]);
-    else
-        glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, width, height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, &data[0]);
-
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-}
-
-void QGLTextureGlyphCache::resizeTextureData(int width, int height)
-{
-    // ### the QTextureGlyphCache API needs to be reworked to allow
-    // ### resizeTextureData to fail
-
-    int oldWidth = m_width;
-    int oldHeight = m_height;
-
-    GLuint oldTexture = m_texture;
-    createTextureData(width, height);
-
-    glBindFramebuffer(GL_FRAMEBUFFER_EXT, m_fbo);
-
-    GLuint tmp_texture;
-    glGenTextures(1, &tmp_texture);
-    glBindTexture(GL_TEXTURE_2D, tmp_texture);
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, oldWidth, oldHeight, 0,
-                 GL_RGBA, GL_UNSIGNED_BYTE, NULL);
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-    glBindTexture(GL_TEXTURE_2D, 0);
-    glFramebufferTexture2D(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
-                           GL_TEXTURE_2D, tmp_texture, 0);
-
-    glActiveTexture(GL_TEXTURE0 + QT_IMAGE_TEXTURE_UNIT);
-    glBindTexture(GL_TEXTURE_2D, oldTexture);
-
-    pex->transferMode(BrushDrawingMode);
-
-#ifndef QT_OPENGL_ES_2
-    if (pex->inRenderText)
-        glPushAttrib(GL_ENABLE_BIT | GL_VIEWPORT_BIT | GL_SCISSOR_BIT);
-#endif
-
-    glDisable(GL_STENCIL_TEST);
-    glDisable(GL_DEPTH_TEST);
-    glDisable(GL_SCISSOR_TEST);
-    glDisable(GL_BLEND);
-
-    glViewport(0, 0, oldWidth, oldHeight);
-
-    float vertexCoordinateArray[] = { -1, -1, 1, -1, 1, 1, -1, 1 };
-    float textureCoordinateArray[] = { 0, 0, 1, 0, 1, 1, 0, 1 };
-
-    glEnableVertexAttribArray(QT_VERTEX_COORDS_ATTR);
-    glEnableVertexAttribArray(QT_TEXTURE_COORDS_ATTR);
-
-    glVertexAttribPointer(QT_VERTEX_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, vertexCoordinateArray);
-    glVertexAttribPointer(QT_TEXTURE_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, textureCoordinateArray);
-
-    pex->shaderManager->blitProgram()->bind();
-    pex->shaderManager->blitProgram()->setUniformValue("imageTexture", QT_IMAGE_TEXTURE_UNIT);
-    pex->shaderManager->setDirty();
-
-    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
-
-    glDisableVertexAttribArray(QT_VERTEX_COORDS_ATTR);
-    glDisableVertexAttribArray(QT_TEXTURE_COORDS_ATTR);
-
-    glBindTexture(GL_TEXTURE_2D, m_texture);
-
-#ifdef QT_OPENGL_ES_2
-    QDataBuffer<uchar> buffer(4*oldWidth*oldHeight);
-    buffer.resize(4*oldWidth*oldHeight);
-    glReadPixels(0, 0, oldWidth, oldHeight, GL_RGBA, GL_UNSIGNED_BYTE, buffer.data());
-
-    // do an in-place conversion from GL_RGBA to GL_ALPHA
-    for (int i=0; i<oldWidth*oldHeight; ++i)
-        buffer.data()[i] = buffer.at(4*i + 3);
-
-    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, oldWidth, oldHeight,
-                    GL_ALPHA, GL_UNSIGNED_BYTE, buffer.data());
-#else
-    glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, oldWidth, oldHeight);
-#endif
-
-    glFramebufferRenderbuffer(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
-                              GL_RENDERBUFFER_EXT, 0);
-    glDeleteTextures(1, &tmp_texture);
-    glDeleteTextures(1, &oldTexture);
-
-    glBindFramebuffer(GL_FRAMEBUFFER_EXT, ctx->d_ptr->current_fbo);
-
-    glViewport(0, 0, pex->width, pex->height);
-    pex->updateClipScissorTest();
-
-#ifndef QT_OPENGL_ES_2
-    if (pex->inRenderText)
-        glPopAttrib();
-#endif
-}
-
-void QGLTextureGlyphCache::fillTexture(const Coord &c, glyph_t glyph)
-{
-    QImage mask = textureMapForGlyph(glyph);
-    const int maskWidth = mask.width();
-    const int maskHeight = mask.height();
-
-    if (mask.format() == QImage::Format_Mono) {
-        mask = mask.convertToFormat(QImage::Format_Indexed8);
-        for (int y = 0; y < maskHeight; ++y) {
-            uchar *src = (uchar *) mask.scanLine(y);
-            for (int x = 0; x < maskWidth; ++x)
-                src[x] = -src[x]; // convert 0 and 1 into 0 and 255
-        }
-     }
-
-
-    glBindTexture(GL_TEXTURE_2D, m_texture);
-    if (mask.format() == QImage::Format_RGB32) {
-        glTexSubImage2D(GL_TEXTURE_2D, 0, c.x, c.y, maskWidth, maskHeight, GL_BGRA, GL_UNSIGNED_BYTE, mask.bits());
-    } else {
-#ifdef QT_OPENGL_ES2
-        glTexSubImage2D(GL_TEXTURE_2D, 0, c.x, c.y, maskWidth, maskHeight, GL_ALPHA, GL_UNSIGNED_BYTE, mask.bits());
-#else
-        // glTexSubImage2D() might cause some garbage to appear in the texture if the mask width is
-        // not a multiple of four bytes. The bug appeared on a computer with 32-bit Windows Vista
-        // and nVidia GeForce 8500GT. GL_UNPACK_ALIGNMENT is set to four bytes, 'mask' has a
-        // multiple of four bytes per line, and most of the glyph shows up correctly in the
-        // texture, which makes me think that this is a driver bug.
-        // One workaround is to make sure the mask width is a multiple of four bytes, for instance
-        // by converting it to a format with four bytes per pixel. Another is to copy one line at a
-        // time.
-
-        for (int i = 0; i < maskHeight; ++i)
-            glTexSubImage2D(GL_TEXTURE_2D, 0, c.x, c.y + i, maskWidth, 1, GL_ALPHA, GL_UNSIGNED_BYTE, mask.scanLine(i));
-#endif
-    }
-}
-
-int QGLTextureGlyphCache::glyphMargin() const
-{
-#if defined(Q_WS_MAC)
-    return 2;
-#elif defined (Q_WS_X11)
-    return 0;
-#else
-    return m_type == QFontEngineGlyphCache::Raster_RGBMask ? 2 : 0;
-#endif
-}
-
 extern QImage qt_imageForBrush(int brushStyle, bool invert);
 
 ////////////////////////////////// Private Methods //////////////////////////////////////////
@@ -359,10 +110,10 @@ QGL2PaintEngineExPrivate::~QGL2PaintEngineExPrivate()
 void QGL2PaintEngineExPrivate::updateTextureFilter(GLenum target, GLenum wrapMode, bool smoothPixmapTransform, GLuint id)
 {
 //    glActiveTexture(GL_TEXTURE0 + QT_BRUSH_TEXTURE_UNIT); //### Is it always this texture unit?
-    if (id != GLuint(-1) && id == lastTexture)
+    if (id != GLuint(-1) && id == lastTextureUsed)
         return;
 
-    lastTexture = id;
+    lastTextureUsed = id;
 
     if (smoothPixmapTransform) {
         glTexParameterf(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
@@ -387,32 +138,41 @@ inline QColor qt_premultiplyColor(QColor c, GLfloat opacity)
 }
 
 
-void QGL2PaintEngineExPrivate::setBrush(const QBrush* brush)
+void QGL2PaintEngineExPrivate::setBrush(const QBrush& brush)
 {
+    if (qbrush_fast_equals(currentBrush, brush))
+        return;
+
+    const Qt::BrushStyle newStyle = qbrush_style(brush);
+    Q_ASSERT(newStyle != Qt::NoBrush);
+
     currentBrush = brush;
-    brushTextureDirty = true;
-    brushUniformsDirty = true;
-    if (currentBrush->style() == Qt::TexturePattern
-        && qHasPixmapTexture(*brush) && brush->texture().isQBitmap())
+    brushUniformsDirty = true; // All brushes have at least one uniform
+
+    if (newStyle > Qt::SolidPattern)
+        brushTextureDirty = true;
+
+    if (currentBrush.style() == Qt::TexturePattern
+        && qHasPixmapTexture(brush) && brush.texture().isQBitmap())
     {
         shaderManager->setSrcPixelType(QGLEngineShaderManager::TextureSrcWithPattern);
     } else {
-        shaderManager->setSrcPixelType(currentBrush->style());
+        shaderManager->setSrcPixelType(newStyle);
     }
-    shaderManager->optimiseForBrushTransform(currentBrush->transform());
+    shaderManager->optimiseForBrushTransform(currentBrush.transform().type());
 }
 
 
 void QGL2PaintEngineExPrivate::useSimpleShader()
 {
-    shaderManager->simpleProgram()->bind();
-    shaderManager->setDirty();
+    shaderManager->useSimpleProgram();
 
     if (matrixDirty)
         updateMatrix();
 
     if (simpleShaderMatrixUniformDirty) {
-        shaderManager->simpleProgram()->setUniformValue("pmvMatrix", pmvMatrix);
+        const GLuint location = shaderManager->simpleProgram()->uniformLocation("pmvMatrix");
+        glUniformMatrix3fv(location, 1, GL_FALSE, (GLfloat*)pmvMatrix);
         simpleShaderMatrixUniformDirty = false;
     }
 }
@@ -421,7 +181,7 @@ void QGL2PaintEngineExPrivate::updateBrushTexture()
 {
     Q_Q(QGL2PaintEngineEx);
 //     qDebug("QGL2PaintEngineExPrivate::updateBrushTexture()");
-    Qt::BrushStyle style = currentBrush->style();
+    Qt::BrushStyle style = currentBrush.style();
 
     if ( (style >= Qt::Dense1Pattern) && (style <= Qt::DiagCrossPattern) ) {
         // Get the image data for the pattern
@@ -434,7 +194,7 @@ void QGL2PaintEngineExPrivate::updateBrushTexture()
     else if (style >= Qt::LinearGradientPattern && style <= Qt::ConicalGradientPattern) {
         // Gradiant brush: All the gradiants use the same texture
 
-        const QGradient* g = currentBrush->gradient();
+        const QGradient* g = currentBrush.gradient();
 
         // We apply global opacity in the fragment shaders, so we always pass 1.0
         // for opacity to the cache.
@@ -451,7 +211,7 @@ void QGL2PaintEngineExPrivate::updateBrushTexture()
             updateTextureFilter(GL_TEXTURE_2D, GL_CLAMP_TO_EDGE, q->state()->renderHints & QPainter::SmoothPixmapTransform);
     }
     else if (style == Qt::TexturePattern) {
-        const QPixmap& texPixmap = currentBrush->texture();
+        const QPixmap& texPixmap = currentBrush.texture();
 
         glActiveTexture(GL_TEXTURE0 + QT_BRUSH_TEXTURE_UNIT);
         QGLTexture *tex = ctx->d_func()->bindTexture(texPixmap, GL_TEXTURE_2D, GL_RGBA, QGLContext::InternalBindOption);
@@ -465,15 +225,15 @@ void QGL2PaintEngineExPrivate::updateBrushTexture()
 void QGL2PaintEngineExPrivate::updateBrushUniforms()
 {
 //     qDebug("QGL2PaintEngineExPrivate::updateBrushUniforms()");
-    Qt::BrushStyle style = currentBrush->style();
+    Qt::BrushStyle style = currentBrush.style();
 
     if (style == Qt::NoBrush)
         return;
 
-    QTransform brushQTransform = currentBrush->transform();
+    QTransform brushQTransform = currentBrush.transform();
 
     if (style == Qt::SolidPattern) {
-        QColor col = qt_premultiplyColor(currentBrush->color(), (GLfloat)q->state()->opacity);
+        QColor col = qt_premultiplyColor(currentBrush.color(), (GLfloat)q->state()->opacity);
         shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::FragmentColor), col);
     }
     else {
@@ -481,7 +241,7 @@ void QGL2PaintEngineExPrivate::updateBrushUniforms()
         QPointF translationPoint;
 
         if (style <= Qt::DiagCrossPattern) {
-            QColor col = qt_premultiplyColor(currentBrush->color(), (GLfloat)q->state()->opacity);
+            QColor col = qt_premultiplyColor(currentBrush.color(), (GLfloat)q->state()->opacity);
 
             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::PatternColor), col);
 
@@ -489,7 +249,7 @@ void QGL2PaintEngineExPrivate::updateBrushUniforms()
             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::HalfViewportSize), halfViewportSize);
         }
         else if (style == Qt::LinearGradientPattern) {
-            const QLinearGradient *g = static_cast<const QLinearGradient *>(currentBrush->gradient());
+            const QLinearGradient *g = static_cast<const QLinearGradient *>(currentBrush.gradient());
 
             QPointF realStart = g->start();
             QPointF realFinal = g->finalStop();
@@ -509,7 +269,7 @@ void QGL2PaintEngineExPrivate::updateBrushUniforms()
             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::HalfViewportSize), halfViewportSize);
         }
         else if (style == Qt::ConicalGradientPattern) {
-            const QConicalGradient *g = static_cast<const QConicalGradient *>(currentBrush->gradient());
+            const QConicalGradient *g = static_cast<const QConicalGradient *>(currentBrush.gradient());
             translationPoint   = g->center();
 
             GLfloat angle = -(g->angle() * 2 * Q_PI) / 360.0;
@@ -520,7 +280,7 @@ void QGL2PaintEngineExPrivate::updateBrushUniforms()
             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::HalfViewportSize), halfViewportSize);
         }
         else if (style == Qt::RadialGradientPattern) {
-            const QRadialGradient *g = static_cast<const QRadialGradient *>(currentBrush->gradient());
+            const QRadialGradient *g = static_cast<const QRadialGradient *>(currentBrush.gradient());
             QPointF realCenter = g->center();
             QPointF realFocal  = g->focalPoint();
             qreal   realRadius = g->radius();
@@ -538,10 +298,10 @@ void QGL2PaintEngineExPrivate::updateBrushUniforms()
             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::HalfViewportSize), halfViewportSize);
         }
         else if (style == Qt::TexturePattern) {
-            const QPixmap& texPixmap = currentBrush->texture();
+            const QPixmap& texPixmap = currentBrush.texture();
 
-            if (qHasPixmapTexture(*currentBrush) && currentBrush->texture().isQBitmap()) {
-                QColor col = qt_premultiplyColor(currentBrush->color(), (GLfloat)q->state()->opacity);
+            if (qHasPixmapTexture(currentBrush) && currentBrush.texture().isQBitmap()) {
+                QColor col = qt_premultiplyColor(currentBrush.color(), (GLfloat)q->state()->opacity);
                 shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::PatternColor), col);
             }
 
@@ -562,7 +322,7 @@ void QGL2PaintEngineExPrivate::updateBrushUniforms()
         QTransform gl_to_qt(1, 0, 0, -1, 0, height);
         QTransform inv_matrix;
         if (style == Qt::TexturePattern && textureInvertedY == -1)
-            inv_matrix = gl_to_qt * (QTransform(1, 0, 0, -1, 0, currentBrush->texture().height()) * brushQTransform * matrix).inverted() * translate;
+            inv_matrix = gl_to_qt * (QTransform(1, 0, 0, -1, 0, currentBrush.texture().height()) * brushQTransform * matrix).inverted() * translate;
         else
             inv_matrix = gl_to_qt * (brushQTransform * matrix).inverted() * translate;
 
@@ -578,37 +338,52 @@ void QGL2PaintEngineExPrivate::updateMatrix()
 {
 //     qDebug("QGL2PaintEngineExPrivate::updateMatrix()");
 
-    // We set up the 4x4 transformation matrix on the vertex shaders to
-    // be the equivalent of glOrtho(0, w, h, 0, -1, 1) * transform:
+    const QTransform& transform = q->state()->matrix;
+
+    // The projection matrix converts from Qt's coordinate system to GL's coordinate system
+    //    * GL's viewport is 2x2, Qt's is width x height
+    //    * GL has +y -> -y going from bottom -> top, Qt is the other way round
+    //    * GL has [0,0] in the center, Qt has it in the top-left
     //
-    // | 2/width     0     0 -1 |   | m11  m21  0   dx |
-    // |   0    -2/height  0  1 |   | m12  m22  0   dy |
-    // |   0         0    -1  0 | * |  0    0   1   0  |
-    // |   0         0     0  1 |   | m13  m23  0  m33 |
+    // This results in the Projection matrix below, which is multiplied by the painter's
+    // transformation matrix, as shown below:
     //
-    // We expand out the multiplication to save the cost of a full 4x4
-    // matrix multiplication as most of the components are trivial.
-    const QTransform& transform = q->state()->matrix;
+    //                Projection Matrix                      Painter Transform
+    // ------------------------------------------------   ------------------------
+    // | 2.0 / width  |      0.0      |     -1.0      |   |  m11  |  m21  |  dx  |
+    // |     0.0      | -2.0 / height |      1.0      | * |  m12  |  m22  |  dy  |
+    // |     0.0      |      0.0      |      1.0      |   |  m13  |  m23  |  m33 |
+    // ------------------------------------------------   ------------------------
+    //
+    // NOTE: The resultant matrix is also transposed, as GL expects column-major matracies
+
+    const GLfloat wfactor = 2.0f / width;
+    const GLfloat hfactor = -2.0f / height;
+    GLfloat dx = transform.dx();
+    GLfloat dy = transform.dy();
+
+    // Non-integer translates can have strange effects for some rendering operations such as
+    // anti-aliased text rendering. In such cases, we snap the translate to the pixel grid.
+    if (snapToPixelGrid && transform.type() == QTransform::TxTranslate) {
+        // 0.50 needs to rounded down to 0.0 for consistency with raster engine:
+        dx = ceilf(dx - 0.5f);
+        dy = ceilf(dy - 0.5f);
+    }
+
+    if (addOffset) {
+        dx += 0.49f;
+        dy += 0.49f;
+    }
 
-    qreal wfactor = 2.0 / width;
-    qreal hfactor = -2.0 / height;
-
-    pmvMatrix[0][0] = wfactor * transform.m11() - transform.m13();
-    pmvMatrix[0][1] = hfactor * transform.m12() + transform.m13();
-    pmvMatrix[0][2] = 0.0;
-    pmvMatrix[0][3] = transform.m13();
-    pmvMatrix[1][0] = wfactor * transform.m21() - transform.m23();
-    pmvMatrix[1][1] = hfactor * transform.m22() + transform.m23();
-    pmvMatrix[1][2] = 0.0;
-    pmvMatrix[1][3] = transform.m23();
-    pmvMatrix[2][0] = 0.0;
-    pmvMatrix[2][1] = 0.0;
-    pmvMatrix[2][2] = -1.0;
-    pmvMatrix[2][3] = 0.0;
-    pmvMatrix[3][0] = wfactor * transform.dx() - transform.m33();
-    pmvMatrix[3][1] = hfactor * transform.dy() + transform.m33();
-    pmvMatrix[3][2] = 0.0;
-    pmvMatrix[3][3] = transform.m33();
+    pmvMatrix[0][0] = (wfactor * transform.m11())  - transform.m13();
+    pmvMatrix[1][0] = (wfactor * transform.m21())  - transform.m23();
+    pmvMatrix[2][0] = (wfactor * dx) - transform.m33();
+    pmvMatrix[0][1] = (hfactor * transform.m12())  + transform.m13();
+    pmvMatrix[1][1] = (hfactor * transform.m22())  + transform.m23();
+    pmvMatrix[2][1] = (hfactor * dy) + transform.m33();
+    pmvMatrix[0][2] = transform.m13();
+    pmvMatrix[1][2] = transform.m23();
+    pmvMatrix[2][2] = transform.m33();
 
     // 1/10000 == 0.0001, so we have good enough res to cover curves
     // that span the entire widget...
@@ -695,7 +470,19 @@ static inline void setCoords(GLfloat *coords, const QGLRect &rect)
 void QGL2PaintEngineExPrivate::drawTexture(const QGLRect& dest, const QGLRect& src, const QSize &textureSize, bool opaque, bool pattern)
 {
     // Setup for texture drawing
+    currentBrush = noBrush;
     shaderManager->setSrcPixelType(pattern ? QGLEngineShaderManager::PatternSrc : QGLEngineShaderManager::ImageSrc);
+
+    if (addOffset) {
+        addOffset = false;
+        matrixDirty = true;
+    }
+
+    if (snapToPixelGrid) {
+        snapToPixelGrid = false;
+        matrixDirty = true;
+    }
+
     if (prepareForDraw(opaque))
         shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::ImageTexture), QT_IMAGE_TEXTURE_UNIT);
 
@@ -724,6 +511,10 @@ void QGL2PaintEngineEx::beginNativePainting()
     QGLContext *ctx = d->ctx;
     glUseProgram(0);
 
+    // Disable all the vertex attribute arrays:
+    for (int i = 0; i < QT_GL_VERTEX_ARRAY_TRACKED_COUNT; ++i)
+        glDisableVertexAttribArray(i);
+
 #ifndef QT_OPENGL_ES_2
     // be nice to people who mix OpenGL 1.x code with QPainter commands
     // by setting modelview and projection matrices to mirror the GL 1
@@ -750,7 +541,7 @@ void QGL2PaintEngineEx::beginNativePainting()
     Q_UNUSED(ctx);
 #endif
 
-    d->lastTexture = GLuint(-1);
+    d->lastTextureUsed = GLuint(-1);
     d->dirtyStencilRegion = QRect(0, 0, d->width, d->height);
     d->resetGLState();
 
@@ -769,6 +560,9 @@ void QGL2PaintEngineExPrivate::resetGLState()
     glDepthMask(true);
     glDepthFunc(GL_LESS);
     glClearDepth(1);
+    glStencilMask(0xff);
+    glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
+    glStencilFunc(GL_ALWAYS, 0, 0xff);
 }
 
 void QGL2PaintEngineEx::endNativePainting()
@@ -777,46 +571,26 @@ void QGL2PaintEngineEx::endNativePainting()
     d->needsSync = true;
 }
 
-const QGLContext *QGL2PaintEngineEx::context()
-{
-    Q_D(QGL2PaintEngineEx);
-    return d->ctx;
-}
-
 void QGL2PaintEngineExPrivate::transferMode(EngineMode newMode)
 {
     if (newMode == mode)
         return;
 
     if (mode == TextDrawingMode || mode == ImageDrawingMode || mode == ImageArrayDrawingMode) {
-        glDisableVertexAttribArray(QT_TEXTURE_COORDS_ATTR);
-        glDisableVertexAttribArray(QT_VERTEX_COORDS_ATTR);
-        glDisableVertexAttribArray(QT_OPACITY_ATTR);
-
-        lastTexture = GLuint(-1);
+        lastTextureUsed = GLuint(-1);
     }
 
     if (newMode == TextDrawingMode) {
-        glEnableVertexAttribArray(QT_VERTEX_COORDS_ATTR);
-        glEnableVertexAttribArray(QT_TEXTURE_COORDS_ATTR);
-
         glVertexAttribPointer(QT_VERTEX_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, vertexCoordinateArray.data());
         glVertexAttribPointer(QT_TEXTURE_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, textureCoordinateArray.data());
     }
 
     if (newMode == ImageDrawingMode) {
-        glEnableVertexAttribArray(QT_VERTEX_COORDS_ATTR);
-        glEnableVertexAttribArray(QT_TEXTURE_COORDS_ATTR);
-
         glVertexAttribPointer(QT_VERTEX_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, staticVertexCoordinateArray);
         glVertexAttribPointer(QT_TEXTURE_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, staticTextureCoordinateArray);
     }
 
     if (newMode == ImageArrayDrawingMode) {
-        glEnableVertexAttribArray(QT_VERTEX_COORDS_ATTR);
-        glEnableVertexAttribArray(QT_TEXTURE_COORDS_ATTR);
-        glEnableVertexAttribArray(QT_OPACITY_ATTR);
-
         glVertexAttribPointer(QT_VERTEX_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, vertexCoordinateArray.data());
         glVertexAttribPointer(QT_TEXTURE_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, textureCoordinateArray.data());
         glVertexAttribPointer(QT_OPACITY_ATTR, 1, GL_FLOAT, GL_FALSE, 0, opacityArray.data());
@@ -844,15 +618,16 @@ struct QGL2PEVectorPathCache
     qreal iscale;
 };
 
-void qopengl2paintengine_cleanup_vectorpath(QPaintEngineEx *engine, void *data)
+void QGL2PaintEngineExPrivate::cleanupVectorPath(QPaintEngineEx *engine, void *data)
 {
     QGL2PEVectorPathCache *c = (QGL2PEVectorPathCache *) data;
 #ifdef QT_OPENGL_CACHE_AS_VBOS
-    QGL2PaintEngineExPrivate *d = QGL2PaintEngineExPrivate::getData((QGL2PaintEngineEx *) engine);
-    d->unusedVBOSToClean << c->vbo;
+    Q_ASSERT(engine->type() == QPaintEngine::OpenGL2);
+    static_cast<QGL2PaintEngineEx *>(engine)->d_func()->unusedVBOSToClean << c->vbo;
     if (c->ibo)
         d->unusedIBOSToClean << c->ibo;
 #else
+    Q_UNUSED(engine);
     qFree(c->vertices);
     qFree(c->indices);
 #endif
@@ -864,6 +639,21 @@ void QGL2PaintEngineExPrivate::fill(const QVectorPath& path)
 {
     transferMode(BrushDrawingMode);
 
+    const QOpenGL2PaintEngineState *s = q->state();
+    const bool newAddOffset = !(s->renderHints & QPainter::Antialiasing) &&
+                              (qbrush_style(currentBrush) == Qt::SolidPattern) &&
+                              !multisamplingAlwaysEnabled;
+
+    if (addOffset != newAddOffset) {
+        addOffset = newAddOffset;
+        matrixDirty = true;
+    }
+
+    if (snapToPixelGrid) {
+        snapToPixelGrid = false;
+        matrixDirty = true;
+    }
+
     // Might need to call updateMatrix to re-calculate inverseScale
     if (matrixDirty)
         updateMatrix();
@@ -876,7 +666,7 @@ void QGL2PaintEngineExPrivate::fill(const QVectorPath& path)
     // Check to see if there's any hints
     if (path.shape() == QVectorPath::RectangleHint) {
         QGLRect rect(points[0].x(), points[0].y(), points[2].x(), points[2].y());
-        prepareForDraw(currentBrush->isOpaque());
+        prepareForDraw(currentBrush.isOpaque());
         composite(rect);
     } else if (path.isConvex()) {
 
@@ -884,6 +674,8 @@ void QGL2PaintEngineExPrivate::fill(const QVectorPath& path)
             QVectorPath::CacheEntry *data = path.lookupCacheData(q);
             QGL2PEVectorPathCache *cache;
 
+            bool updateCache = false;
+
             if (data) {
                 cache = (QGL2PEVectorPathCache *) data->data;
                 // Check if scale factor is exceeded for curved paths and generate curves if so...
@@ -898,23 +690,23 @@ void QGL2PaintEngineExPrivate::fill(const QVectorPath& path)
                         qFree(cache->vertices);
                         Q_ASSERT(cache->indices == 0);
 #endif
-                        cache->vertexCount = 0;
+                        updateCache = true;
                     }
                 }
             } else {
                 cache = new QGL2PEVectorPathCache;
-                cache->vertexCount = 0;
-                cache->indexCount = 0;
-                data = const_cast<QVectorPath &>(path).addCacheData(q, cache, qopengl2paintengine_cleanup_vectorpath);
+                data = const_cast<QVectorPath &>(path).addCacheData(q, cache, cleanupVectorPath);
+                updateCache = true;
             }
 
             // Flatten the path at the current scale factor and fill it into the cache struct.
-            if (!cache->vertexCount) {
+            if (updateCache) {
                 vertexCoordinateArray.clear();
                 vertexCoordinateArray.addPath(path, inverseScale, false);
                 int vertexCount = vertexCoordinateArray.vertexCount();
                 int floatSizeInBytes = vertexCount * 2 * sizeof(float);
                 cache->vertexCount = vertexCount;
+                cache->indexCount = 0;
                 cache->primitiveType = GL_TRIANGLE_FAN;
                 cache->iscale = inverseScale;
 #ifdef QT_OPENGL_CACHE_AS_VBOS
@@ -929,8 +721,7 @@ void QGL2PaintEngineExPrivate::fill(const QVectorPath& path)
 #endif
             }
 
-            prepareForDraw(currentBrush->isOpaque());
-            glEnableVertexAttribArray(QT_VERTEX_COORDS_ATTR);
+            prepareForDraw(currentBrush.isOpaque());
 #ifdef QT_OPENGL_CACHE_AS_VBOS
             glBindBuffer(GL_ARRAY_BUFFER, cache->vbo);
             glVertexAttribPointer(QT_VERTEX_COORDS_ATTR, 2, GL_FLOAT, false, 0, 0);
@@ -946,23 +737,27 @@ void QGL2PaintEngineExPrivate::fill(const QVectorPath& path)
                 path.makeCacheable();
             vertexCoordinateArray.clear();
             vertexCoordinateArray.addPath(path, inverseScale, false);
-            prepareForDraw(currentBrush->isOpaque());
+            prepareForDraw(currentBrush.isOpaque());
             drawVertexArrays(vertexCoordinateArray, GL_TRIANGLE_FAN);
         }
 
     } else {
+        bool useCache = path.isCacheable();
+        if (useCache) {
+            QRectF bbox = path.controlPointRect();
+            // If the path doesn't fit within these limits, it is possible that the triangulation will fail.
+            useCache &= (bbox.left() > -0x8000 * inverseScale)
+                     && (bbox.right() < 0x8000 * inverseScale)
+                     && (bbox.top() > -0x8000 * inverseScale)
+                     && (bbox.bottom() < 0x8000 * inverseScale);
+        }
 
-        QRectF bbox = path.controlPointRect();
-        // If the path doesn't fit within these limits, it is possible that the triangulation will fail.
-        bool pathIsWithinLimits = (bbox.left() > -0x8000 * inverseScale)
-                                && (bbox.right() < 0x8000 * inverseScale)
-                                && (bbox.top() > -0x8000 * inverseScale)
-                                && (bbox.bottom() < 0x8000 * inverseScale);
-
-        if (path.isCacheable() && pathIsWithinLimits) {
+        if (useCache) {
             QVectorPath::CacheEntry *data = path.lookupCacheData(q);
             QGL2PEVectorPathCache *cache;
 
+            bool updateCache = false;
+
             if (data) {
                 cache = (QGL2PEVectorPathCache *) data->data;
                 // Check if scale factor is exceeded for curved paths and generate curves if so...
@@ -972,24 +767,21 @@ void QGL2PaintEngineExPrivate::fill(const QVectorPath& path)
 #ifdef QT_OPENGL_CACHE_AS_VBOS
                         glDeleteBuffers(1, &cache->vbo);
                         glDeleteBuffers(1, &cache->ibo);
-                        cache->vbo = cache->ibo = 0;
 #else
                         qFree(cache->vertices);
                         qFree(cache->indices);
 #endif
-                        cache->vertexCount = 0;
-                        cache->indexCount = 0;
+                        updateCache = true;
                     }
                 }
             } else {
                 cache = new QGL2PEVectorPathCache;
-                cache->vertexCount = 0;
-                cache->indexCount = 0;
-                data = const_cast<QVectorPath &>(path).addCacheData(q, cache, qopengl2paintengine_cleanup_vectorpath);
+                data = const_cast<QVectorPath &>(path).addCacheData(q, cache, cleanupVectorPath);
+                updateCache = true;
             }
 
             // Flatten the path at the current scale factor and fill it into the cache struct.
-            if (!cache->vertexCount) {
+            if (updateCache) {
                 QTriangleSet polys = qTriangulate(path, QTransform().scale(1 / inverseScale, 1 / inverseScale));
                 cache->vertexCount = polys.vertices.size() / 2;
                 cache->indexCount = polys.indices.size();
@@ -1016,7 +808,7 @@ void QGL2PaintEngineExPrivate::fill(const QVectorPath& path)
 #endif
             }
 
-            prepareForDraw(currentBrush->isOpaque());
+            prepareForDraw(currentBrush.isOpaque());
             glEnableVertexAttribArray(QT_VERTEX_COORDS_ATTR);
 #ifdef QT_OPENGL_CACHE_AS_VBOS
             glBindBuffer(GL_ARRAY_BUFFER, cache->vbo);
@@ -1055,20 +847,11 @@ void QGL2PaintEngineExPrivate::fill(const QVectorPath& path)
                 // Pass when high bit is set, replace stencil value with 0
                 glStencilFunc(GL_NOTEQUAL, 0, GL_STENCIL_HIGH_BIT);
             }
-
-            prepareForDraw(currentBrush->isOpaque());
-
-            if (inRenderText)
-                prepareDepthRangeForRenderText();
+            prepareForDraw(currentBrush.isOpaque());
 
             // Stencil the brush onto the dest buffer
             composite(vertexCoordinateArray.boundingRect());
-
-            if (inRenderText)
-                restoreDepthRangeForRenderText();
-
             glStencilMask(0);
-
             updateClipScissorTest();
         }
     }
@@ -1108,13 +891,6 @@ void QGL2PaintEngineExPrivate::fillStencilWithVertexArray(const float *data,
     useSimpleShader();
     glEnable(GL_STENCIL_TEST); // For some reason, this has to happen _after_ the simple shader is use()'d
 
-#ifndef QT_OPENGL_ES_2
-    if (inRenderText) {
-        glPushAttrib(GL_ENABLE_BIT);
-        glDisable(GL_DEPTH_TEST);
-    }
-#endif
-
     if (mode == WindingFillMode) {
         Q_ASSERT(stops && !count);
         if (q->state()->clipTestEnabled) {
@@ -1155,10 +931,8 @@ void QGL2PaintEngineExPrivate::fillStencilWithVertexArray(const float *data,
         glStencilMask(GL_STENCIL_HIGH_BIT);
 #if 0
         glStencilOp(GL_KEEP, GL_KEEP, GL_INVERT); // Simply invert the stencil bit
-        glEnableVertexAttribArray(QT_VERTEX_COORDS_ATTR);
         glVertexAttribPointer(QT_VERTEX_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, data);
         glDrawArrays(GL_TRIANGLE_STRIP, 0, count);
-        glDisableVertexAttribArray(QT_VERTEX_COORDS_ATTR);
 #else
 
         glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
@@ -1168,21 +942,13 @@ void QGL2PaintEngineExPrivate::fillStencilWithVertexArray(const float *data,
         } else {
             glStencilFunc(GL_ALWAYS, GL_STENCIL_HIGH_BIT, 0xff);
         }
-        glEnableVertexAttribArray(QT_VERTEX_COORDS_ATTR);
         glVertexAttribPointer(QT_VERTEX_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, data);
         glDrawArrays(GL_TRIANGLE_STRIP, 0, count);
-        glDisableVertexAttribArray(QT_VERTEX_COORDS_ATTR);
 #endif
     }
 
     // Enable color writes & disable stencil writes
     glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
-
-#ifndef QT_OPENGL_ES_2
-    if (inRenderText)
-        glPopAttrib();
-#endif
-
 }
 
 /*
@@ -1254,10 +1020,10 @@ bool QGL2PaintEngineExPrivate::prepareForDraw(bool srcPixelsAreOpaque)
                                       : QGLEngineShaderManager::NoOpacity;
         if (stateHasOpacity && (mode != ImageDrawingMode)) {
             // Using a brush
-            bool brushIsPattern = (currentBrush->style() >= Qt::Dense1Pattern) &&
-                                  (currentBrush->style() <= Qt::DiagCrossPattern);
+            bool brushIsPattern = (currentBrush.style() >= Qt::Dense1Pattern) &&
+                                  (currentBrush.style() <= Qt::DiagCrossPattern);
 
-            if ((currentBrush->style() == Qt::SolidPattern) || brushIsPattern)
+            if ((currentBrush.style() == Qt::SolidPattern) || brushIsPattern)
                 opacityMode = QGLEngineShaderManager::NoOpacity; // Global opacity handled by srcPixel shader
         }
     }
@@ -1276,7 +1042,7 @@ bool QGL2PaintEngineExPrivate::prepareForDraw(bool srcPixelsAreOpaque)
         updateBrushUniforms();
 
     if (shaderMatrixUniformDirty) {
-        shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::PmvMatrix), pmvMatrix);
+        glUniformMatrix3fv(location(QGLEngineShaderManager::PmvMatrix), 1, GL_FALSE, (GLfloat*)pmvMatrix);
         shaderMatrixUniformDirty = false;
     }
 
@@ -1298,12 +1064,8 @@ void QGL2PaintEngineExPrivate::composite(const QGLRect& boundingRect)
         boundingRect.right, boundingRect.top
     };
 
-    glEnableVertexAttribArray(QT_VERTEX_COORDS_ATTR);
     glVertexAttribPointer(QT_VERTEX_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, rectVerts);
-
     glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
-
-    glDisableVertexAttribArray(QT_VERTEX_COORDS_ATTR);
 }
 
 // Draws the vertex array as a set of <vertexArrayStops.size()> triangle fans.
@@ -1311,7 +1073,6 @@ void QGL2PaintEngineExPrivate::drawVertexArrays(const float *data, int *stops, i
                                                 GLenum primitive)
 {
     // Now setup the pointer to the vertex array:
-    glEnableVertexAttribArray(QT_VERTEX_COORDS_ATTR);
     glVertexAttribPointer(QT_VERTEX_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, data);
 
     int previousStop = 0;
@@ -1325,31 +1086,6 @@ void QGL2PaintEngineExPrivate::drawVertexArrays(const float *data, int *stops, i
         glDrawArrays(primitive, previousStop, stop - previousStop);
         previousStop = stop;
     }
-    glDisableVertexAttribArray(QT_VERTEX_COORDS_ATTR);
-}
-
-void QGL2PaintEngineExPrivate::prepareDepthRangeForRenderText()
-{
-#ifndef QT_OPENGL_ES_2
-    // Get the z translation value from the model view matrix and
-    // transform it using the ortogonal projection with z-near = 0,
-    // and z-far = 1, which is used in QGLWidget::renderText()
-    GLdouble model[4][4];
-    glGetDoublev(GL_MODELVIEW_MATRIX, &model[0][0]);
-    float deviceZ = -2 * model[3][2] - 1;
-
-    glGetFloatv(GL_DEPTH_RANGE, depthRange);
-    float windowZ = depthRange[0] + (deviceZ + 1) * 0.5 * (depthRange[1] - depthRange[0]);
-
-    glDepthRange(windowZ, windowZ);
-#endif
-}
-
-void QGL2PaintEngineExPrivate::restoreDepthRangeForRenderText()
-{
-#ifndef QT_OPENGL_ES_2
-    glDepthRange(depthRange[0], depthRange[1]);
-#endif
 }
 
 /////////////////////////////////// Public Methods //////////////////////////////////////////
@@ -1367,31 +1103,11 @@ void QGL2PaintEngineEx::fill(const QVectorPath &path, const QBrush &brush)
 {
     Q_D(QGL2PaintEngineEx);
 
-    Qt::BrushStyle style = qbrush_style(brush);
-    if (style == Qt::NoBrush)
+    if (qbrush_style(brush) == Qt::NoBrush)
         return;
-    if (!d->inRenderText)
-        ensureActive();
-
-    QOpenGL2PaintEngineState *s = state();
-    bool doOffset = !(s->renderHints & QPainter::Antialiasing) &&
-                    (style == Qt::SolidPattern) &&
-                    !d->multisamplingAlwaysEnabled;
-
-    if (doOffset) {
-        d->temporaryTransform = s->matrix;
-        QTransform tx = QTransform::fromTranslate(.49, .49);
-        s->matrix = s->matrix * tx;
-        d->matrixDirty = true;
-    }
-
-    d->setBrush(&brush);
+    ensureActive();
+    d->setBrush(brush);
     d->fill(path);
-
-    if (doOffset) {
-        s->matrix = d->temporaryTransform;
-        d->matrixDirty = true;
-    }
 }
 
 extern bool qt_scaleForTransform(const QTransform &transform, qreal *scale); // qtransform.cpp
@@ -1401,9 +1117,8 @@ void QGL2PaintEngineEx::stroke(const QVectorPath &path, const QPen &pen)
 {
     Q_D(QGL2PaintEngineEx);
 
-    Qt::PenStyle penStyle = qpen_style(pen);
     const QBrush &penBrush = qpen_brush(pen);
-    if (penStyle == Qt::NoPen || qbrush_style(penBrush) == Qt::NoBrush)
+    if (qpen_style(pen) == Qt::NoPen || qbrush_style(penBrush) == Qt::NoBrush)
         return;
 
     QOpenGL2PaintEngineState *s = state();
@@ -1414,53 +1129,57 @@ void QGL2PaintEngineEx::stroke(const QVectorPath &path, const QPen &pen)
     }
 
     ensureActive();
+    d->setBrush(penBrush);
+    d->stroke(path, pen);
+}
 
-    bool doOffset = !(s->renderHints & QPainter::Antialiasing) && !d->multisamplingAlwaysEnabled;
-    if (doOffset) {
-        d->temporaryTransform = s->matrix;
-        QTransform tx = QTransform::fromTranslate(0.49, .49);
-        s->matrix = s->matrix * tx;
-        d->matrixDirty = true;
+void QGL2PaintEngineExPrivate::stroke(const QVectorPath &path, const QPen &pen)
+{
+    const QOpenGL2PaintEngineState *s = q->state();
+    const bool newAddOffset = !(s->renderHints & QPainter::Antialiasing) && !multisamplingAlwaysEnabled;
+    if (addOffset != newAddOffset) {
+        addOffset = newAddOffset;
+        matrixDirty = true;
     }
 
-    bool opaque = penBrush.isOpaque() && s->opacity > 0.99;
-    d->setBrush(&penBrush);
-    d->transferMode(BrushDrawingMode);
+    if (snapToPixelGrid) {
+        snapToPixelGrid = false;
+        matrixDirty = true;
+    }
+
+    const Qt::PenStyle penStyle = qpen_style(pen);
+    const QBrush &penBrush = qpen_brush(pen);
+    const bool opaque = penBrush.isOpaque() && s->opacity > 0.99;
+
+    transferMode(BrushDrawingMode);
 
     // updateMatrix() is responsible for setting the inverse scale on
     // the strokers, so we need to call it here and not wait for
     // prepareForDraw() down below.
-    d->updateMatrix();
+    updateMatrix();
 
     if (penStyle == Qt::SolidLine) {
-        d->stroker.process(path, pen);
+        stroker.process(path, pen);
 
     } else { // Some sort of dash
-        d->dasher.process(path, pen);
+        dasher.process(path, pen);
 
-        QVectorPath dashStroke(d->dasher.points(),
-                               d->dasher.elementCount(),
-                               d->dasher.elementTypes());
-        d->stroker.process(dashStroke, pen);
+        QVectorPath dashStroke(dasher.points(),
+                               dasher.elementCount(),
+                               dasher.elementTypes());
+        stroker.process(dashStroke, pen);
     }
 
-
-    QGLContext *ctx = d->ctx;
-    Q_UNUSED(ctx);
-
     if (opaque) {
-        d->prepareForDraw(opaque);
-        glEnableVertexAttribArray(QT_VERTEX_COORDS_ATTR);
-        glVertexAttribPointer(QT_VERTEX_COORDS_ATTR, 2, GL_FLOAT, false, 0, d->stroker.vertices());
-        glDrawArrays(GL_TRIANGLE_STRIP, 0, d->stroker.vertexCount() / 2);
+        prepareForDraw(opaque);
+        glVertexAttribPointer(QT_VERTEX_COORDS_ATTR, 2, GL_FLOAT, false, 0, stroker.vertices());
+        glDrawArrays(GL_TRIANGLE_STRIP, 0, stroker.vertexCount() / 2);
 
 //         QBrush b(Qt::green);
 //         d->setBrush(&b);
 //         d->prepareForDraw(true);
 //         glDrawArrays(GL_LINE_STRIP, 0, d->stroker.vertexCount() / 2);
 
-        glDisableVertexAttribArray(QT_VERTEX_COORDS_ATTR);
-
     } else {
         qreal width = qpen_widthf(pen) / 2;
         if (width == 0)
@@ -1470,30 +1189,25 @@ void QGL2PaintEngineEx::stroke(const QVectorPath &path, const QPen &pen)
                       : width;
 
         if (pen.isCosmetic())
-            extra = extra * d->inverseScale;
+            extra = extra * inverseScale;
 
         QRectF bounds = path.controlPointRect().adjusted(-extra, -extra, extra, extra);
 
-        d->fillStencilWithVertexArray(d->stroker.vertices(), d->stroker.vertexCount() / 2,
+        fillStencilWithVertexArray(stroker.vertices(), stroker.vertexCount() / 2,
                                       0, 0, bounds, QGL2PaintEngineExPrivate::TriStripStrokeFillMode);
 
         glStencilOp(GL_KEEP, GL_REPLACE, GL_REPLACE);
 
         // Pass when any bit is set, replace stencil value with 0
         glStencilFunc(GL_NOTEQUAL, 0, GL_STENCIL_HIGH_BIT);
-        d->prepareForDraw(false);
+        prepareForDraw(false);
 
         // Stencil the brush onto the dest buffer
-        d->composite(bounds);
+        composite(bounds);
 
         glStencilMask(0);
 
-        d->updateClipScissorTest();
-    }
-
-    if (doOffset) {
-        s->matrix = d->temporaryTransform;
-        d->matrixDirty = true;
+        updateClipScissorTest();
     }
 }
 
@@ -1533,7 +1247,7 @@ void QGL2PaintEngineEx::renderHintsChanged()
 #endif
 
     Q_D(QGL2PaintEngineEx);
-    d->lastTexture = GLuint(-1);
+    d->lastTextureUsed = GLuint(-1);
     d->brushTextureDirty = true;
 //    qDebug("QGL2PaintEngineEx::renderHintsChanged() not implemented!");
 }
@@ -1611,8 +1325,7 @@ void QGL2PaintEngineEx::drawTextItem(const QPointF &p, const QTextItem &textItem
 {
     Q_D(QGL2PaintEngineEx);
 
-    if (!d->inRenderText)
-        ensureActive();
+    ensureActive();
     QOpenGL2PaintEngineState *s = state();
 
     const QTextItemInt &ti = static_cast<const QTextItemInt &>(textItem);
@@ -1631,7 +1344,7 @@ void QGL2PaintEngineEx::drawTextItem(const QPointF &p, const QTextItem &textItem
                                             ? QFontEngineGlyphCache::Type(ti.fontEngine->glyphFormat)
                                             : d->glyphCacheType;
 
-    if (d->inRenderText || txtype > QTransform::TxTranslate)
+    if (txtype > QTransform::TxTranslate)
         glyphType = QFontEngineGlyphCache::Raster_A8;
 
     if (glyphType == QFontEngineGlyphCache::Raster_RGBMask
@@ -1673,8 +1386,6 @@ void QGL2PaintEngineExPrivate::drawCachedGlyphs(const QPointF &p, QFontEngineGly
     if (cache->width() == 0 || cache->height() == 0)
         return;
 
-    if (inRenderText)
-        transferMode(BrushDrawingMode);
     transferMode(TextDrawingMode);
 
     int margin = cache->glyphMargin();
@@ -1702,11 +1413,17 @@ void QGL2PaintEngineExPrivate::drawCachedGlyphs(const QPointF &p, QFontEngineGly
     if (textureCoordinateArray.data() != oldTextureCoordinateDataPtr)
         glVertexAttribPointer(QT_TEXTURE_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, textureCoordinateArray.data());
 
-    QBrush pensBrush = q->state()->pen.brush();
-    setBrush(&pensBrush);
+    if (addOffset) {
+        addOffset = false;
+        matrixDirty = true;
+    }
+    if (!snapToPixelGrid) {
+        snapToPixelGrid = true;
+        matrixDirty = true;
+    }
 
-    if (inRenderText)
-        prepareDepthRangeForRenderText();
+    QBrush pensBrush = q->state()->pen.brush();
+    setBrush(pensBrush);
 
     if (glyphType == QFontEngineGlyphCache::Raster_RGBMask) {
 
@@ -1748,7 +1465,7 @@ void QGL2PaintEngineExPrivate::drawCachedGlyphs(const QPointF &p, QFontEngineGly
                 q->state()->opacity = 1;
                 opacityUniformDirty = true;
                 pensBrush = Qt::white;
-                setBrush(&pensBrush);
+                setBrush(pensBrush);
             }
 
             compositionModeDirty = false; // I can handle this myself, thank you very much
@@ -1769,7 +1486,7 @@ void QGL2PaintEngineExPrivate::drawCachedGlyphs(const QPointF &p, QFontEngineGly
                 q->state()->opacity = oldOpacity;
                 opacityUniformDirty = true;
                 pensBrush = q->state()->pen.brush();
-                setBrush(&pensBrush);
+                setBrush(pensBrush);
             }
 
             compositionModeDirty = false;
@@ -1792,27 +1509,40 @@ void QGL2PaintEngineExPrivate::drawCachedGlyphs(const QPointF &p, QFontEngineGly
 
     shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::MaskTexture), QT_MASK_TEXTURE_UNIT);
     glDrawArrays(GL_TRIANGLES, 0, 6 * glyphs.size());
-
-    if (inRenderText)
-        restoreDepthRangeForRenderText();
 }
 
 void QGL2PaintEngineEx::drawPixmaps(const QDrawPixmaps::Data *drawingData, int dataCount, const QPixmap &pixmap, QDrawPixmaps::DrawingHints hints)
 {
+    Q_D(QGL2PaintEngineEx);
     // Use fallback for extended composition modes.
     if (state()->composition_mode > QPainter::CompositionMode_Plus) {
         QPaintEngineEx::drawPixmaps(drawingData, dataCount, pixmap, hints);
         return;
     }
 
-    Q_D(QGL2PaintEngineEx);
+    ensureActive();
+    d->drawPixmaps(drawingData, dataCount, pixmap, hints);
+}
 
+
+void QGL2PaintEngineExPrivate::drawPixmaps(const QDrawPixmaps::Data *drawingData, int dataCount, const QPixmap &pixmap, QDrawPixmaps::DrawingHints hints)
+{
     GLfloat dx = 1.0f / pixmap.size().width();
     GLfloat dy = 1.0f / pixmap.size().height();
 
-    d->vertexCoordinateArray.clear();
-    d->textureCoordinateArray.clear();
-    d->opacityArray.reset();
+    vertexCoordinateArray.clear();
+    textureCoordinateArray.clear();
+    opacityArray.reset();
+
+    if (addOffset) {
+        addOffset = false;
+        matrixDirty = true;
+    }
+
+    if (snapToPixelGrid) {
+        snapToPixelGrid = false;
+        matrixDirty = true;
+    }
 
     bool allOpaque = true;
 
@@ -1829,31 +1559,28 @@ void QGL2PaintEngineEx::drawPixmaps(const QDrawPixmaps::Data *drawingData, int d
         QGLPoint bottomRight(right * c - bottom * s, right * s + bottom * c);
         QGLPoint bottomLeft(-right * c - bottom * s, -right * s + bottom * c);
 
-        d->vertexCoordinateArray.lineToArray(bottomRight.x + drawingData[i].point.x(), bottomRight.y + drawingData[i].point.y());
-        d->vertexCoordinateArray.lineToArray(-bottomLeft.x + drawingData[i].point.x(), -bottomLeft.y + drawingData[i].point.y());
-        d->vertexCoordinateArray.lineToArray(-bottomRight.x + drawingData[i].point.x(), -bottomRight.y + drawingData[i].point.y());
-        d->vertexCoordinateArray.lineToArray(-bottomRight.x + drawingData[i].point.x(), -bottomRight.y + drawingData[i].point.y());
-        d->vertexCoordinateArray.lineToArray(bottomLeft.x + drawingData[i].point.x(), bottomLeft.y + drawingData[i].point.y());
-        d->vertexCoordinateArray.lineToArray(bottomRight.x + drawingData[i].point.x(), bottomRight.y + drawingData[i].point.y());
+        vertexCoordinateArray.lineToArray(bottomRight.x + drawingData[i].point.x(), bottomRight.y + drawingData[i].point.y());
+        vertexCoordinateArray.lineToArray(-bottomLeft.x + drawingData[i].point.x(), -bottomLeft.y + drawingData[i].point.y());
+        vertexCoordinateArray.lineToArray(-bottomRight.x + drawingData[i].point.x(), -bottomRight.y + drawingData[i].point.y());
+        vertexCoordinateArray.lineToArray(-bottomRight.x + drawingData[i].point.x(), -bottomRight.y + drawingData[i].point.y());
+        vertexCoordinateArray.lineToArray(bottomLeft.x + drawingData[i].point.x(), bottomLeft.y + drawingData[i].point.y());
+        vertexCoordinateArray.lineToArray(bottomRight.x + drawingData[i].point.x(), bottomRight.y + drawingData[i].point.y());
 
         QGLRect src(drawingData[i].source.left() * dx, drawingData[i].source.top() * dy,
                     drawingData[i].source.right() * dx, drawingData[i].source.bottom() * dy);
 
-        d->textureCoordinateArray.lineToArray(src.right, src.bottom);
-        d->textureCoordinateArray.lineToArray(src.right, src.top);
-        d->textureCoordinateArray.lineToArray(src.left, src.top);
-        d->textureCoordinateArray.lineToArray(src.left, src.top);
-        d->textureCoordinateArray.lineToArray(src.left, src.bottom);
-        d->textureCoordinateArray.lineToArray(src.right, src.bottom);
+        textureCoordinateArray.lineToArray(src.right, src.bottom);
+        textureCoordinateArray.lineToArray(src.right, src.top);
+        textureCoordinateArray.lineToArray(src.left, src.top);
+        textureCoordinateArray.lineToArray(src.left, src.top);
+        textureCoordinateArray.lineToArray(src.left, src.bottom);
+        textureCoordinateArray.lineToArray(src.right, src.bottom);
 
-        qreal opacity = drawingData[i].opacity * state()->opacity;
-        d->opacityArray << opacity << opacity << opacity << opacity << opacity << opacity;
+        qreal opacity = drawingData[i].opacity * q->state()->opacity;
+        opacityArray << opacity << opacity << opacity << opacity << opacity << opacity;
         allOpaque &= (opacity >= 0.99f);
     }
 
-    ensureActive();
-
-    QGLContext *ctx = d->ctx;
     glActiveTexture(GL_TEXTURE0 + QT_IMAGE_TEXTURE_UNIT);
     QGLTexture *texture = ctx->d_func()->bindTexture(pixmap, GL_TEXTURE_2D, GL_RGBA,
                                                      QGLContext::InternalBindOption
@@ -1861,27 +1588,28 @@ void QGL2PaintEngineEx::drawPixmaps(const QDrawPixmaps::Data *drawingData, int d
 
     if (texture->options & QGLContext::InvertedYBindOption) {
         // Flip texture y-coordinate.
-        QGLPoint *data = d->textureCoordinateArray.data();
+        QGLPoint *data = textureCoordinateArray.data();
         for (int i = 0; i < 6 * dataCount; ++i)
             data[i].y = 1 - data[i].y;
     }
 
-    d->transferMode(ImageArrayDrawingMode);
+    transferMode(ImageArrayDrawingMode);
 
     bool isBitmap = pixmap.isQBitmap();
     bool isOpaque = !isBitmap && (!pixmap.hasAlphaChannel() || (hints & QDrawPixmaps::OpaqueHint)) && allOpaque;
 
-    d->updateTextureFilter(GL_TEXTURE_2D, GL_CLAMP_TO_EDGE,
-                           state()->renderHints & QPainter::SmoothPixmapTransform, texture->id);
+    updateTextureFilter(GL_TEXTURE_2D, GL_CLAMP_TO_EDGE,
+                           q->state()->renderHints & QPainter::SmoothPixmapTransform, texture->id);
 
     // Setup for texture drawing
-    d->shaderManager->setSrcPixelType(isBitmap ? QGLEngineShaderManager::PatternSrc : QGLEngineShaderManager::ImageSrc);
-    if (d->prepareForDraw(isOpaque))
-        d->shaderManager->currentProgram()->setUniformValue(d->location(QGLEngineShaderManager::ImageTexture), QT_IMAGE_TEXTURE_UNIT);
+    currentBrush = noBrush;
+    shaderManager->setSrcPixelType(isBitmap ? QGLEngineShaderManager::PatternSrc : QGLEngineShaderManager::ImageSrc);
+    if (prepareForDraw(isOpaque))
+        shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::ImageTexture), QT_IMAGE_TEXTURE_UNIT);
 
     if (isBitmap) {
-        QColor col = qt_premultiplyColor(state()->pen.color(), (GLfloat)state()->opacity);
-        d->shaderManager->currentProgram()->setUniformValue(d->location(QGLEngineShaderManager::PatternColor), col);
+        QColor col = qt_premultiplyColor(q->state()->pen.color(), (GLfloat)q->state()->opacity);
+        shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::PatternColor), col);
     }
 
     glDrawArrays(GL_TRIANGLES, 0, 6 * dataCount);
@@ -1913,7 +1641,8 @@ bool QGL2PaintEngineEx::begin(QPaintDevice *pdev)
     d->compositionModeDirty = true;
     d->opacityUniformDirty = true;
     d->needsSync = true;
-    d->use_system_clip = !systemClip().isEmpty();
+    d->useSystemClip = !systemClip().isEmpty();
+    d->currentBrush = QBrush();
 
     d->dirtyStencilRegion = QRect(0, 0, d->width, d->height);
     d->stencilClean = true;
@@ -1932,11 +1661,9 @@ bool QGL2PaintEngineEx::begin(QPaintDevice *pdev)
 
     d->shaderManager = new QGLEngineShaderManager(d->ctx);
 
-    if (!d->inRenderText) {
-        glDisable(GL_STENCIL_TEST);
-        glDisable(GL_DEPTH_TEST);
-        glDisable(GL_SCISSOR_TEST);
-    }
+    glDisable(GL_STENCIL_TEST);
+    glDisable(GL_DEPTH_TEST);
+    glDisable(GL_SCISSOR_TEST);
 
 #if !defined(QT_OPENGL_ES_2)
     glDisable(GL_MULTISAMPLE);
@@ -1946,6 +1673,7 @@ bool QGL2PaintEngineEx::begin(QPaintDevice *pdev)
 
 #if !defined(QT_OPENGL_ES_2)
 #if defined(Q_WS_WIN)
+    extern Q_GUI_EXPORT bool qt_cleartype_enabled;
     if (qt_cleartype_enabled)
 #endif
         d->glyphCacheType = QFontEngineGlyphCache::Raster_RGBMask;
@@ -2017,6 +1745,7 @@ void QGL2PaintEngineEx::ensureActive()
         glViewport(0, 0, d->width, d->height);
         d->needsSync = false;
         d->shaderManager->setDirty();
+        d->ctx->d_func()->syncGlState();
         setState(state());
     }
 }
@@ -2037,12 +1766,12 @@ void QGL2PaintEngineExPrivate::updateClipScissorTest()
 #else
     QRect bounds = q->state()->rectangleClip;
     if (!q->state()->clipEnabled) {
-        if (use_system_clip)
+        if (useSystemClip)
             bounds = systemClip.boundingRect();
         else
             bounds = QRect(0, 0, width, height);
     } else {
-        if (use_system_clip)
+        if (useSystemClip)
             bounds = bounds.intersected(systemClip.boundingRect());
         else
             bounds = bounds.intersected(QRect(0, 0, width, height));
@@ -2097,6 +1826,15 @@ void QGL2PaintEngineExPrivate::writeClip(const QVectorPath &path, uint value)
 {
     transferMode(BrushDrawingMode);
 
+    if (addOffset) {
+        addOffset = false;
+        matrixDirty = true;
+    }
+    if (snapToPixelGrid) {
+        snapToPixelGrid = false;
+        matrixDirty = true;
+    }
+
     if (matrixDirty)
         updateMatrix();
 
@@ -2196,7 +1934,7 @@ void QGL2PaintEngineEx::clip(const QVectorPath &path, Qt::ClipOperation op)
 
     switch (op) {
     case Qt::NoClip:
-        if (d->use_system_clip) {
+        if (d->useSystemClip) {
             state()->clipTestEnabled = true;
             state()->currentClip = 1;
         } else {
@@ -2268,13 +2006,13 @@ void QGL2PaintEngineExPrivate::systemStateChanged()
     q->state()->clipChanged = true;
 
     if (systemClip.isEmpty()) {
-        use_system_clip = false;
+        useSystemClip = false;
     } else {
         if (q->paintDevice()->devType() == QInternal::Widget && currentClipWidget) {
             QWidgetPrivate *widgetPrivate = qt_widget_private(currentClipWidget->window());
-            use_system_clip = widgetPrivate->extra && widgetPrivate->extra->inRenderWithPainter;
+            useSystemClip = widgetPrivate->extra && widgetPrivate->extra->inRenderWithPainter;
         } else {
-            use_system_clip = true;
+            useSystemClip = true;
         }
     }
 
@@ -2284,19 +2022,19 @@ void QGL2PaintEngineExPrivate::systemStateChanged()
     q->state()->currentClip = 1;
     maxClip = 1;
 
-    q->state()->rectangleClip = use_system_clip ? systemClip.boundingRect() : QRect(0, 0, width, height);
+    q->state()->rectangleClip = useSystemClip ? systemClip.boundingRect() : QRect(0, 0, width, height);
     updateClipScissorTest();
 
     if (systemClip.rectCount() == 1) {
         if (systemClip.boundingRect() == QRect(0, 0, width, height))
-            use_system_clip = false;
+            useSystemClip = false;
 #ifndef QT_GL_NO_SCISSOR_TEST
         // scissoring takes care of the system clip
         return;
 #endif
     }
 
-    if (use_system_clip) {
+    if (useSystemClip) {
         clearClip(0);
 
         QPainterPath path;
@@ -2375,12 +2113,6 @@ QPainterState *QGL2PaintEngineEx::createState(QPainterState *orig) const
     return s;
 }
 
-void QGL2PaintEngineEx::setRenderTextActive(bool active)
-{
-    Q_D(QGL2PaintEngineEx);
-    d->inRenderText = active;
-}
-
 QOpenGL2PaintEngineState::QOpenGL2PaintEngineState(QOpenGL2PaintEngineState &other)
     : QPainterState(other)
 {
@@ -2405,5 +2137,3 @@ QOpenGL2PaintEngineState::~QOpenGL2PaintEngineState()
 }
 
 QT_END_NAMESPACE
-
-#include "qpaintengineex_opengl2.moc"
diff --git a/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h b/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h
index 844d42b..f3cba17 100644
--- a/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h
+++ b/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h
@@ -73,6 +73,12 @@ enum EngineMode {
 
 QT_BEGIN_NAMESPACE
 
+#define GL_STENCIL_HIGH_BIT         GLuint(0x80)
+#define QT_BRUSH_TEXTURE_UNIT       GLuint(0)
+#define QT_IMAGE_TEXTURE_UNIT       GLuint(0) //Can be the same as brush texture unit
+#define QT_MASK_TEXTURE_UNIT        GLuint(1)
+#define QT_BACKGROUND_TEXTURE_UNIT  GLuint(2)
+
 class QGL2PaintEngineExPrivate;
 
 
@@ -105,13 +111,8 @@ public:
     ~QGL2PaintEngineEx();
 
     bool begin(QPaintDevice *device);
-    bool end();
-
     void ensureActive();
-
-    virtual void fill(const QVectorPath &path, const QBrush &brush);
-    virtual void stroke(const QVectorPath &path, const QPen &pen);
-    virtual void clip(const QVectorPath &path, Qt::ClipOperation op);
+    bool end();
 
     virtual void clipEnabledChanged();
     virtual void penChanged();
@@ -122,20 +123,21 @@ public:
     virtual void renderHintsChanged();
     virtual void transformChanged();
 
-
+    virtual void drawTexture(const QRectF &r, GLuint textureId, const QSize &size, const QRectF &sr);
     virtual void drawPixmap(const QRectF &r, const QPixmap &pm, const QRectF &sr);
+    virtual void drawPixmaps(const QDrawPixmaps::Data *drawingData, int dataCount, const QPixmap &pixmap, QDrawPixmaps::DrawingHints hints);
     virtual void drawImage(const QRectF &r, const QImage &pm, const QRectF &sr,
                            Qt::ImageConversionFlags flags = Qt::AutoColor);
-    virtual void drawTexture(const QRectF &r, GLuint textureId, const QSize &size, const QRectF &sr);
-
     virtual void drawTextItem(const QPointF &p, const QTextItem &textItem);
+    virtual void fill(const QVectorPath &path, const QBrush &brush);
+    virtual void stroke(const QVectorPath &path, const QPen &pen);
+    virtual void clip(const QVectorPath &path, Qt::ClipOperation op);
 
-    virtual void drawPixmaps(const QDrawPixmaps::Data *drawingData, int dataCount, const QPixmap &pixmap, QDrawPixmaps::DrawingHints hints);
 
     Type type() const { return OpenGL2; }
 
-    void setState(QPainterState *s);
-    QPainterState *createState(QPainterState *orig) const;
+    virtual void setState(QPainterState *s);
+    virtual QPainterState *createState(QPainterState *orig) const;
     inline QOpenGL2PaintEngineState *state() {
         return static_cast<QOpenGL2PaintEngineState *>(QPaintEngineEx::state());
     }
@@ -146,8 +148,6 @@ public:
     void beginNativePainting();
     void endNativePainting();
 
-    const QGLContext* context();
-
     QPixmapFilter *pixmapFilter(int type, const QPixmapFilter *prototype);
 
     void setRenderTextActive(bool);
@@ -169,12 +169,13 @@ public:
 
     QGL2PaintEngineExPrivate(QGL2PaintEngineEx *q_ptr) :
             q(q_ptr),
+            shaderManager(0),
             width(0), height(0),
             ctx(0),
-            currentBrush(0),
-            inverseScale(1),
-            shaderManager(0),
-            inRenderText(false)
+            useSystemClip(true),
+            snapToPixelGrid(false),
+            addOffset(false),
+            inverseScale(1)
     { }
 
     ~QGL2PaintEngineExPrivate();
@@ -185,45 +186,57 @@ public:
     void updateCompositionMode();
     void updateTextureFilter(GLenum target, GLenum wrapMode, bool smoothPixmapTransform, GLuint id = -1);
 
-    void setBrush(const QBrush* brush);
-
-    void transferMode(EngineMode newMode);
     void resetGLState();
 
-    // fill, drawOutline, drawTexture & drawCachedGlyphs are the rendering entry points:
+    // fill, stroke, drawTexture, drawPixmaps & drawCachedGlyphs are the main rendering entry-points,
+    // however writeClip can also be thought of as en entry point as it does similar things.
     void fill(const QVectorPath &path);
+    void stroke(const QVectorPath &path, const QPen &pen);
     void drawTexture(const QGLRect& dest, const QGLRect& src, const QSize &textureSize, bool opaque, bool pattern = false);
+    void drawPixmaps(const QDrawPixmaps::Data *drawingData, int dataCount, const QPixmap &pixmap, QDrawPixmaps::DrawingHints hints);
     void drawCachedGlyphs(const QPointF &p, QFontEngineGlyphCache::Type glyphType, const QTextItemInt &ti);
 
+    // draws whatever is in the vertex array:
     void drawVertexArrays(const float *data, int *stops, int stopCount, GLenum primitive);
     void drawVertexArrays(QGL2PEXVertexArray &vertexArray, GLenum primitive) {
         drawVertexArrays((const float *) vertexArray.data(), vertexArray.stops(), vertexArray.stopCount(), primitive);
     }
 
-        // ^ draws whatever is in the vertex array
+    // Composites the bounding rect onto dest buffer:
     void composite(const QGLRect& boundingRect);
-        // ^ Composites the bounding rect onto dest buffer
 
+    // Calls drawVertexArrays to render into stencil buffer:
     void fillStencilWithVertexArray(const float *data, int count, int *stops, int stopCount, const QGLRect &bounds, StencilFillMode mode);
     void fillStencilWithVertexArray(QGL2PEXVertexArray& vertexArray, bool useWindingFill) {
         fillStencilWithVertexArray((const float *) vertexArray.data(), 0, vertexArray.stops(), vertexArray.stopCount(),
                                    vertexArray.boundingRect(),
                                    useWindingFill ? WindingFillMode : OddEvenFillMode);
     }
-        // ^ Calls drawVertexArrays to render into stencil buffer
-
-    bool prepareForDraw(bool srcPixelsAreOpaque);
-        // ^ returns whether the current program changed or not
 
+    void setBrush(const QBrush& brush);
+    void transferMode(EngineMode newMode);
+    bool prepareForDraw(bool srcPixelsAreOpaque); // returns true if the program has changed
     inline void useSimpleShader();
+    inline GLuint location(const QGLEngineShaderManager::Uniform uniform) {
+        return shaderManager->getUniformLocation(uniform);
+    }
 
-    void prepareDepthRangeForRenderText();
-    void restoreDepthRangeForRenderText();
+    void clearClip(uint value);
+    void writeClip(const QVectorPath &path, uint value);
+    void resetClipIfNeeded();
+
+    void updateClipScissorTest();
+    void setScissor(const QRect &rect);
+    void regenerateClip();
+    void systemStateChanged();
 
     static QGLEngineShaderManager* shaderManagerForEngine(QGL2PaintEngineEx *engine) { return engine->d_func()->shaderManager; }
     static QGL2PaintEngineExPrivate *getData(QGL2PaintEngineEx *engine) { return engine->d_func(); }
+    static void cleanupVectorPath(QPaintEngineEx *engine, void *data);
+
 
     QGL2PaintEngineEx* q;
+    QGLEngineShaderManager* shaderManager;
     QGLPaintDevice* device;
     int width, height;
     QGLContext *ctx;
@@ -240,44 +253,28 @@ public:
     bool opacityUniformDirty;
 
     bool stencilClean; // Has the stencil not been used for clipping so far?
+    bool useSystemClip;
     QRegion dirtyStencilRegion;
     QRect currentScissorBounds;
     uint maxClip;
 
-    const QBrush*    currentBrush; // May not be the state's brush!
-
-    GLfloat     inverseScale;
+    QBrush currentBrush; // May not be the state's brush!
+    const QBrush noBrush;
 
     QGL2PEXVertexArray vertexCoordinateArray;
     QGL2PEXVertexArray textureCoordinateArray;
     QDataBuffer<GLfloat> opacityArray;
-
     GLfloat staticVertexCoordinateArray[8];
     GLfloat staticTextureCoordinateArray[8];
 
-    GLfloat pmvMatrix[4][4];
-
-    QGLEngineShaderManager* shaderManager;
-
-    void clearClip(uint value);
-    void writeClip(const QVectorPath &path, uint value);
-    void resetClipIfNeeded();
-
-    void updateClipScissorTest();
-    void setScissor(const QRect &rect);
-    void regenerateClip();
-    void systemStateChanged();
-    uint use_system_clip : 1;
-
-    uint location(QGLEngineShaderManager::Uniform uniform)
-    {
-        return shaderManager->getUniformLocation(uniform);
-    }
+    bool snapToPixelGrid;
+    bool addOffset; // When enabled, adds a 0.49,0.49 offset to matrix in updateMatrix
+    GLfloat pmvMatrix[3][3];
+    GLfloat inverseScale;
 
-    GLuint lastTexture;
+    GLuint lastTextureUsed;
 
     bool needsSync;
-    bool inRenderText;
     bool multisamplingAlwaysEnabled;
 
     GLfloat depthRange[2];
@@ -286,15 +283,11 @@ public:
 
     QTriangulatingStroker stroker;
     QDashedStrokeProcessor dasher;
-    QTransform temporaryTransform;
 
     QScopedPointer<QPixmapFilter> convolutionFilter;
     QScopedPointer<QPixmapFilter> colorizeFilter;
     QScopedPointer<QPixmapFilter> blurFilter;
-    QScopedPointer<QPixmapFilter> animationBlurFilter;
-    QScopedPointer<QPixmapFilter> fastBlurFilter;
     QScopedPointer<QPixmapFilter> dropShadowFilter;
-    QScopedPointer<QPixmapFilter> fastDropShadowFilter;
 
     QSet<QVectorPath::CacheEntry *> pathCaches;
     QVector<GLuint> unusedVBOSToClean;
diff --git a/src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp b/src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp
new file mode 100644
index 0000000..047876f
--- /dev/null
+++ b/src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp
@@ -0,0 +1,216 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtOpenGL module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qtextureglyphcache_gl_p.h"
+#include "qpaintengineex_opengl2_p.h"
+
+#ifdef Q_WS_WIN
+extern Q_GUI_EXPORT bool qt_cleartype_enabled;
+#endif
+
+QGLTextureGlyphCache::QGLTextureGlyphCache(QGLContext *context, QFontEngineGlyphCache::Type type, const QTransform &matrix)
+    : QTextureGlyphCache(type, matrix)
+    , ctx(context)
+    , m_width(0)
+    , m_height(0)
+{
+    glGenFramebuffers(1, &m_fbo);
+    connect(QGLSignalProxy::instance(), SIGNAL(aboutToDestroyContext(const QGLContext*)),
+            SLOT(contextDestroyed(const QGLContext*)));
+}
+
+QGLTextureGlyphCache::~QGLTextureGlyphCache()
+{
+    if (ctx) {
+        QGLShareContextScope scope(ctx);
+        glDeleteFramebuffers(1, &m_fbo);
+
+        if (m_width || m_height)
+            glDeleteTextures(1, &m_texture);
+    }
+}
+
+void QGLTextureGlyphCache::createTextureData(int width, int height)
+{
+    glGenTextures(1, &m_texture);
+    glBindTexture(GL_TEXTURE_2D, m_texture);
+
+    m_width = width;
+    m_height = height;
+
+    QVarLengthArray<uchar> data(width * height);
+    for (int i = 0; i < data.size(); ++i)
+        data[i] = 0;
+
+    if (m_type == QFontEngineGlyphCache::Raster_RGBMask)
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, &data[0]);
+    else
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, width, height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, &data[0]);
+
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+}
+
+void QGLTextureGlyphCache::resizeTextureData(int width, int height)
+{
+    // ### the QTextureGlyphCache API needs to be reworked to allow
+    // ### resizeTextureData to fail
+
+    int oldWidth = m_width;
+    int oldHeight = m_height;
+
+    GLuint oldTexture = m_texture;
+    createTextureData(width, height);
+
+    glBindFramebuffer(GL_FRAMEBUFFER_EXT, m_fbo);
+
+    GLuint tmp_texture;
+    glGenTextures(1, &tmp_texture);
+    glBindTexture(GL_TEXTURE_2D, tmp_texture);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, oldWidth, oldHeight, 0,
+                 GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    glBindTexture(GL_TEXTURE_2D, 0);
+    glFramebufferTexture2D(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
+                           GL_TEXTURE_2D, tmp_texture, 0);
+
+    glActiveTexture(GL_TEXTURE0 + QT_IMAGE_TEXTURE_UNIT);
+    glBindTexture(GL_TEXTURE_2D, oldTexture);
+
+    pex->transferMode(BrushDrawingMode);
+
+    glDisable(GL_STENCIL_TEST);
+    glDisable(GL_DEPTH_TEST);
+    glDisable(GL_SCISSOR_TEST);
+    glDisable(GL_BLEND);
+
+    glViewport(0, 0, oldWidth, oldHeight);
+
+    float vertexCoordinateArray[] = { -1, -1, 1, -1, 1, 1, -1, 1 };
+    float textureCoordinateArray[] = { 0, 0, 1, 0, 1, 1, 0, 1 };
+
+    glVertexAttribPointer(QT_VERTEX_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, vertexCoordinateArray);
+    glVertexAttribPointer(QT_TEXTURE_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, textureCoordinateArray);
+
+    pex->shaderManager->useBlitProgram();
+    pex->shaderManager->blitProgram()->setUniformValue("imageTexture", QT_IMAGE_TEXTURE_UNIT);
+
+    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+
+    glBindTexture(GL_TEXTURE_2D, m_texture);
+
+#ifdef QT_OPENGL_ES_2
+    QDataBuffer<uchar> buffer(4*oldWidth*oldHeight);
+    buffer.resize(4*oldWidth*oldHeight);
+    glReadPixels(0, 0, oldWidth, oldHeight, GL_RGBA, GL_UNSIGNED_BYTE, buffer.data());
+
+    // do an in-place conversion from GL_RGBA to GL_ALPHA
+    for (int i=0; i<oldWidth*oldHeight; ++i)
+        buffer.data()[i] = buffer.at(4*i + 3);
+
+    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, oldWidth, oldHeight,
+                    GL_ALPHA, GL_UNSIGNED_BYTE, buffer.data());
+#else
+    glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, oldWidth, oldHeight);
+#endif
+
+    glFramebufferRenderbuffer(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
+                              GL_RENDERBUFFER_EXT, 0);
+    glDeleteTextures(1, &tmp_texture);
+    glDeleteTextures(1, &oldTexture);
+
+    glBindFramebuffer(GL_FRAMEBUFFER_EXT, ctx->d_ptr->current_fbo);
+
+    glViewport(0, 0, pex->width, pex->height);
+    pex->updateClipScissorTest();
+}
+
+void QGLTextureGlyphCache::fillTexture(const Coord &c, glyph_t glyph)
+{
+    QImage mask = textureMapForGlyph(glyph);
+    const int maskWidth = mask.width();
+    const int maskHeight = mask.height();
+
+    if (mask.format() == QImage::Format_Mono) {
+        mask = mask.convertToFormat(QImage::Format_Indexed8);
+        for (int y = 0; y < maskHeight; ++y) {
+            uchar *src = (uchar *) mask.scanLine(y);
+            for (int x = 0; x < maskWidth; ++x)
+                src[x] = -src[x]; // convert 0 and 1 into 0 and 255
+        }
+     }
+
+
+    glBindTexture(GL_TEXTURE_2D, m_texture);
+    if (mask.format() == QImage::Format_RGB32) {
+        glTexSubImage2D(GL_TEXTURE_2D, 0, c.x, c.y, maskWidth, maskHeight, GL_BGRA, GL_UNSIGNED_BYTE, mask.bits());
+    } else {
+#ifdef QT_OPENGL_ES2
+        glTexSubImage2D(GL_TEXTURE_2D, 0, c.x, c.y, maskWidth, maskHeight, GL_ALPHA, GL_UNSIGNED_BYTE, mask.bits());
+#else
+        // glTexSubImage2D() might cause some garbage to appear in the texture if the mask width is
+        // not a multiple of four bytes. The bug appeared on a computer with 32-bit Windows Vista
+        // and nVidia GeForce 8500GT. GL_UNPACK_ALIGNMENT is set to four bytes, 'mask' has a
+        // multiple of four bytes per line, and most of the glyph shows up correctly in the
+        // texture, which makes me think that this is a driver bug.
+        // One workaround is to make sure the mask width is a multiple of four bytes, for instance
+        // by converting it to a format with four bytes per pixel. Another is to copy one line at a
+        // time.
+
+        for (int i = 0; i < maskHeight; ++i)
+            glTexSubImage2D(GL_TEXTURE_2D, 0, c.x, c.y + i, maskWidth, 1, GL_ALPHA, GL_UNSIGNED_BYTE, mask.scanLine(i));
+#endif
+    }
+}
+
+int QGLTextureGlyphCache::glyphMargin() const
+{
+#if defined(Q_WS_MAC)
+    return 2;
+#elif defined (Q_WS_X11)
+    return 0;
+#else
+    return m_type == QFontEngineGlyphCache::Raster_RGBMask ? 2 : 0;
+#endif
+}
diff --git a/src/opengl/gl2paintengineex/qtextureglyphcache_gl_p.h b/src/opengl/gl2paintengineex/qtextureglyphcache_gl_p.h
new file mode 100644
index 0000000..393893c
--- /dev/null
+++ b/src/opengl/gl2paintengineex/qtextureglyphcache_gl_p.h
@@ -0,0 +1,123 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtOpenGL module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QTEXTUREGLYPHCACHE_GL_P_H
+#define QTEXTUREGLYPHCACHE_GL_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of the QLibrary class.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <private/qtextureglyphcache_p.h>
+#include <private/qgl_p.h>
+#include <qglshaderprogram.h>
+
+
+QT_BEGIN_NAMESPACE
+
+class QGL2PaintEngineExPrivate;
+
+class QGLTextureGlyphCache : public QObject, public QTextureGlyphCache
+{
+    Q_OBJECT
+public:
+    QGLTextureGlyphCache(QGLContext *context, QFontEngineGlyphCache::Type type, const QTransform &matrix);
+    ~QGLTextureGlyphCache();
+
+    virtual void createTextureData(int width, int height);
+    virtual void resizeTextureData(int width, int height);
+    virtual void fillTexture(const Coord &c, glyph_t glyph);
+    virtual int glyphMargin() const;
+
+    inline GLuint texture() const { return m_texture; }
+
+    inline int width() const { return m_width; }
+    inline int height() const { return m_height; }
+
+    inline void setPaintEnginePrivate(QGL2PaintEngineExPrivate *p) { pex = p; }
+
+
+public Q_SLOTS:
+    void contextDestroyed(const QGLContext *context) {
+        if (context == ctx) {
+            const QGLContext *nextCtx = qt_gl_transfer_context(ctx);
+            if (!nextCtx) {
+                // the context may not be current, so we cannot directly
+                // destroy the fbo and texture here, but since the context
+                // is about to be destroyed, the GL server will do the
+                // clean up for us anyway
+                m_fbo = 0;
+                m_texture = 0;
+                ctx = 0;
+            } else {
+                // since the context holding the texture is shared, and
+                // about to be destroyed, we have to transfer ownership
+                // of the texture to one of the share contexts
+                ctx = const_cast<QGLContext *>(nextCtx);
+            }
+        }
+    }
+
+private:
+    QGLContext *ctx;
+
+    QGL2PaintEngineExPrivate *pex;
+
+    GLuint m_texture;
+    GLuint m_fbo;
+
+    int m_width;
+    int m_height;
+
+    QGLShaderProgram *m_program;
+};
+
+QT_END_NAMESPACE
+
+#endif
+
diff --git a/src/opengl/gl2paintengineex/qtriangulatingstroker.cpp b/src/opengl/gl2paintengineex/qtriangulatingstroker.cpp
index 6082f49..395b8a3 100644
--- a/src/opengl/gl2paintengineex/qtriangulatingstroker.cpp
+++ b/src/opengl/gl2paintengineex/qtriangulatingstroker.cpp
@@ -62,8 +62,14 @@ void QTriangulatingStroker::endCapOrJoinClosed(const qreal *start, const qreal *
         endCap(cur);
     }
     int count = m_vertices.size();
-    m_vertices.add(m_vertices.at(count-2));
-    m_vertices.add(m_vertices.at(count-1));
+
+    // Copy the (x, y) values because QDataBuffer::add(const float& t)
+    // may resize the buffer, which will leave t pointing at the
+    // previous buffer's memory region if we don't copy first.
+    float x = m_vertices.at(count-2);
+    float y = m_vertices.at(count-1);
+    m_vertices.add(x);
+    m_vertices.add(y);
 }
 
 
diff --git a/src/opengl/gl2paintengineex/qtriangulator.cpp b/src/opengl/gl2paintengineex/qtriangulator.cpp
index 6a1112b..b60e10d 100644
--- a/src/opengl/gl2paintengineex/qtriangulator.cpp
+++ b/src/opengl/gl2paintengineex/qtriangulator.cpp
@@ -650,53 +650,53 @@ inline void QRBTree<T>::clear()
 template <class T>
 void QRBTree<T>::rotateLeft(Node *node)
 {
-    //   |            |
-    //   N            B
-    //  / \          / \
-    // A   B  --->  N   D
-    //    / \      / \
-    //   C   D    A   C
+    //   |            |      //
+    //   N            B      //
+    //  / \          / \     //
+    // A   B  --->  N   D    //
+    //    / \      / \       //
+    //   C   D    A   C      //
 
     Node *&ref = (node->parent ? (node == node->parent->left ? node->parent->left : node->parent->right) : root);
     ref = node->right;
     node->right->parent = node->parent;
 
-    //   :
-    //   N
-    //  / :|
-    // A   B
-    //    / \
-    //   C   D
+    //   :        //
+    //   N        //
+    //  / :|      //
+    // A   B      //
+    //    / \     //
+    //   C   D    //
 
     node->right = ref->left;
     if (ref->left)
         ref->left->parent = node;
 
-    //   :   |
-    //   N   B
-    //  / \ : \
-    // A   C   D
+    //   :   |     //
+    //   N   B     //
+    //  / \ : \    //
+    // A   C   D   //
 
     ref->left = node;
     node->parent = ref;
 
-    //     |
-    //     B
-    //    / \
-    //   N   D
-    //  / \
-    // A   C
+    //     |       //
+    //     B       //
+    //    / \      //
+    //   N   D     //
+    //  / \        //
+    // A   C       //
 }
 
 template <class T>
 void QRBTree<T>::rotateRight(Node *node)
 {
-    //     |            |
-    //     N            A
-    //    / \          / \
-    //   A   B  --->  C   N
-    //  / \              / \
-    // C   D            D   B
+    //     |            |        //
+    //     N            A        //
+    //    / \          / \       //
+    //   A   B  --->  C   N      //
+    //  / \              / \     //
+    // C   D            D   B    //
 
     Node *&ref = (node->parent ? (node == node->parent->left ? node->parent->left : node->parent->right) : root);
     ref = node->left;
@@ -2707,7 +2707,7 @@ void QTriangulator::SimpleToMonotone::monotoneDecomposition()
         return;
 
     Q_ASSERT(!m_edgeList.root);
-    QDataBuffer<std::pair<int, int> > diagonals;
+    QDataBuffer<QPair<int, int> > diagonals;
 
     int i = 0;
     for (int index = 1; index < m_edges.size(); ++index) {
@@ -2743,7 +2743,7 @@ void QTriangulator::SimpleToMonotone::monotoneDecomposition()
                 if (m_edges.at(i).node) {
                     Q_ASSERT(!m_edges.at(j).node);
                     if (m_edges.at(m_edges.at(i).helper).type == MergeVertex)
-                        diagonals.add(std::pair<int, int>(i, m_edges.at(i).helper));
+                        diagonals.add(QPair<int, int>(i, m_edges.at(i).helper));
                     m_edges.at(j).node = m_edges.at(i).node;
                     m_edges.at(i).node = 0;
                     m_edges.at(j).node->data = j;
@@ -2751,7 +2751,7 @@ void QTriangulator::SimpleToMonotone::monotoneDecomposition()
                 } else if (m_edges.at(j).node) {
                     Q_ASSERT(!m_edges.at(i).node);
                     if (m_edges.at(m_edges.at(j).helper).type == MergeVertex)
-                        diagonals.add(std::pair<int, int>(i, m_edges.at(j).helper));
+                        diagonals.add(QPair<int, int>(i, m_edges.at(j).helper));
                     m_edges.at(i).node = m_edges.at(j).node;
                     m_edges.at(j).node = 0;
                     m_edges.at(i).node->data = i;
@@ -2763,7 +2763,7 @@ void QTriangulator::SimpleToMonotone::monotoneDecomposition()
                 leftEdgeNode = searchEdgeLeftOfPoint(m_edges.at(i).from);
                 if (leftEdgeNode) {
                     if (m_edges.at(m_edges.at(leftEdgeNode->data).helper).type == MergeVertex)
-                        diagonals.add(std::pair<int, int>(i, m_edges.at(leftEdgeNode->data).helper));
+                        diagonals.add(QPair<int, int>(i, m_edges.at(leftEdgeNode->data).helper));
                     m_edges.at(leftEdgeNode->data).helper = i;
                 } else {
                     qWarning("Inconsistent polygon. (#2)");
@@ -2773,7 +2773,7 @@ void QTriangulator::SimpleToMonotone::monotoneDecomposition()
         case SplitVertex:
             leftEdgeNode = searchEdgeLeftOfPoint(m_edges.at(i).from);
             if (leftEdgeNode) {
-                diagonals.add(std::pair<int, int>(i, m_edges.at(leftEdgeNode->data).helper));
+                diagonals.add(QPair<int, int>(i, m_edges.at(leftEdgeNode->data).helper));
                 m_edges.at(leftEdgeNode->data).helper = i;
             } else {
                 qWarning("Inconsistent polygon. (#3)");
@@ -2802,7 +2802,7 @@ void QTriangulator::SimpleToMonotone::monotoneDecomposition()
             leftEdgeNode = searchEdgeLeftOfPoint(m_edges.at(i).from);
             if (leftEdgeNode) {
                 if (m_edges.at(m_edges.at(leftEdgeNode->data).helper).type == MergeVertex)
-                    diagonals.add(std::pair<int, int>(i, m_edges.at(leftEdgeNode->data).helper));
+                    diagonals.add(QPair<int, int>(i, m_edges.at(leftEdgeNode->data).helper));
                 m_edges.at(leftEdgeNode->data).helper = i;
             } else {
                 qWarning("Inconsistent polygon. (#4)");
@@ -2811,7 +2811,7 @@ void QTriangulator::SimpleToMonotone::monotoneDecomposition()
         case EndVertex:
             if (m_clockwiseOrder) {
                 if (m_edges.at(m_edges.at(i).helper).type == MergeVertex)
-                    diagonals.add(std::pair<int, int>(i, m_edges.at(i).helper));
+                    diagonals.add(QPair<int, int>(i, m_edges.at(i).helper));
                 if (m_edges.at(i).node) {
                     m_edgeList.deleteNode(m_edges.at(i).node);
                     Q_ASSERT(m_edgeList.verify());
@@ -2820,7 +2820,7 @@ void QTriangulator::SimpleToMonotone::monotoneDecomposition()
                 }
             } else {
                 if (m_edges.at(m_edges.at(j).helper).type == MergeVertex)
-                    diagonals.add(std::pair<int, int>(i, m_edges.at(j).helper));
+                    diagonals.add(QPair<int, int>(i, m_edges.at(j).helper));
                 if (m_edges.at(j).node) {
                     m_edgeList.deleteNode(m_edges.at(j).node);
                     Q_ASSERT(m_edgeList.verify());
diff --git a/src/opengl/opengl.pro b/src/opengl/opengl.pro
index ec01db0..69cfd30 100644
--- a/src/opengl/opengl.pro
+++ b/src/opengl/opengl.pro
@@ -55,7 +55,8 @@ SOURCES	+= qgl.cpp \
                 gl2paintengineex/qglengineshadersource_p.h \
                 gl2paintengineex/qglcustomshaderstage_p.h \
                 gl2paintengineex/qtriangulatingstroker_p.h \
-                gl2paintengineex/qtriangulator_p.h
+                gl2paintengineex/qtriangulator_p.h \
+                gl2paintengineex/qtextureglyphcache_gl_p.h
 
     SOURCES +=  qglshaderprogram.cpp \
                 qglpixmapfilter.cpp \
@@ -69,7 +70,8 @@ SOURCES	+= qgl.cpp \
                 gl2paintengineex/qpaintengineex_opengl2.cpp \
                 gl2paintengineex/qglcustomshaderstage.cpp \
                 gl2paintengineex/qtriangulatingstroker.cpp \
-                gl2paintengineex/qtriangulator.cpp
+                gl2paintengineex/qtriangulator.cpp \
+                gl2paintengineex/qtextureglyphcache_gl.cpp
 
 }
 
diff --git a/src/opengl/qgl.cpp b/src/opengl/qgl.cpp
index b6f8919..7e922ac 100644
--- a/src/opengl/qgl.cpp
+++ b/src/opengl/qgl.cpp
@@ -227,6 +227,9 @@ bool qt_gl_preferGL2Engine()
     \value DirectRendering   Specifies that the context is used for direct rendering to a display.
     \value HasOverlay        Enables the use of an overlay.
     \value SampleBuffers     Enables the use of sample buffers.
+    \value DeprecatedFunctions      Enables the use of deprecated functionality for OpenGL 3.x
+                                    contexts. A context with deprecated functionality enabled is
+                                    called a full context in the OpenGL specification.
     \value SingleBuffer      Specifies the use of a single buffer, as opposed to double buffers.
     \value NoDepthBuffer     Disables the use of a depth buffer.
     \value ColorIndex        Specifies that the context should use a color index as its pixel format.
@@ -237,6 +240,9 @@ bool qt_gl_preferGL2Engine()
     \value IndirectRendering Specifies that the context is used for indirect rendering to a buffer.
     \value NoOverlay         Disables the use of an overlay.
     \value NoSampleBuffers   Disables the use of sample buffers.
+    \value NoDeprecatedFunctions    Disables the use of deprecated functionality for OpenGL 3.x
+                                    contexts. A context with deprecated functionality disabled is
+                                    called a forward compatible context in the OpenGL specification.
 
     \sa {Sample Buffers Example}
 */
@@ -1082,6 +1088,88 @@ int QGLFormat::stencilBufferSize() const
 }
 
 /*!
+    \since 4.7
+
+    Set the OpenGL version. If a context compatible with the requested OpenGL version
+    cannot be created, a context compatible with version 1.x is created instead.
+
+    \sa majorVersion(), minorVersion()
+*/
+void QGLFormat::setVersion(int major, int minor)
+{
+    if (major < 1 || minor < 0) {
+        qWarning("QGLFormat::setVersion: Cannot set zero or negative version number %d.%d", major, minor);
+        return;
+    }
+    detach();
+    d->majorVersion = major;
+    d->minorVersion = minor;
+}
+
+/*!
+    \since 4.7
+
+    Returns the OpenGL major version.
+
+    \sa setVersion(), minorVersion()
+*/
+int QGLFormat::majorVersion() const
+{
+    return d->majorVersion;
+}
+
+/*!
+    \since 4.7
+
+    Returns the OpenGL minor version.
+
+    \sa setVersion(), majorVersion()
+*/
+int QGLFormat::minorVersion() const
+{
+    return d->minorVersion;
+}
+
+/*!
+    \enum QGLFormat::OpenGLContextProfile
+    \since 4.7
+
+    This enum describes the OpenGL context profiles that can be specified for contexts implementing
+    OpenGL version 3.2 or higher. These profiles are different from OpenGL ES profiles.
+
+    \value NoProfile            OpenGL version is lower than 3.2.
+    \value CoreProfile          Functionality deprecated in OpenGL version 3.0 is not available.
+    \value CompatibilityProfile Functionality from earlier OpenGL versions is available.
+*/
+
+/*!
+    \since 4.7
+
+    Set the OpenGL context profile. The profile is ignored if the requested OpenGL
+    version is less than 3.2.
+
+    \sa profile()
+*/
+void QGLFormat::setProfile(OpenGLContextProfile profile)
+{
+    detach();
+    d->profile = profile;
+}
+
+/*!
+    \since 4.7
+
+    Returns the OpenGL context profile.
+
+    \sa setProfile()
+*/
+QGLFormat::OpenGLContextProfile QGLFormat::profile() const
+{
+    return d->profile;
+}
+
+
+/*!
     \fn bool QGLFormat::hasOpenGL()
 
     Returns true if the window system has any OpenGL support;
@@ -1117,25 +1205,21 @@ QGLFormat::OpenGLVersionFlags Q_AUTOTEST_EXPORT qOpenGLVersionFlagsFromString(co
                     if (parts[2].startsWith(QLatin1String("1.1")))
                         versionFlags |= QGLFormat::OpenGL_ES_Common_Version_1_1 |
                                         QGLFormat::OpenGL_ES_CommonLite_Version_1_1;
-                }
-                else {
+                } else {
                     // Not -CM, must be CL, CommonLite
                     versionFlags |= QGLFormat::OpenGL_ES_CommonLite_Version_1_0;
                     if (parts[2].startsWith(QLatin1String("1.1")))
                         versionFlags |= QGLFormat::OpenGL_ES_CommonLite_Version_1_1;
                 }
-            }
-            else {
+            } else {
                 // OpenGL ES version 2.0 or higher
                 versionFlags |= QGLFormat::OpenGL_ES_Version_2_0;
             }
-        }
-        else {
+        } else {
             // if < 3 parts to the name, it is an unrecognised OpenGL ES
             qWarning("Unrecognised OpenGL ES version");
         }
-    }
-    else {
+    } else {
         // not ES, regular OpenGL, the version numbers are first in the string
         if (versionString.startsWith(QLatin1String("1."))) {
             switch (versionString[2].toAscii()) {
@@ -1152,30 +1236,35 @@ QGLFormat::OpenGLVersionFlags Q_AUTOTEST_EXPORT qOpenGLVersionFlagsFromString(co
             default:
                 break;
             }
-        }
-        else if (versionString.startsWith(QLatin1String("2."))) {
+        } else if (versionString.startsWith(QLatin1String("2."))) {
             versionFlags |= QGLFormat::OpenGL_Version_1_1 |
                             QGLFormat::OpenGL_Version_1_2 |
                             QGLFormat::OpenGL_Version_1_3 |
                             QGLFormat::OpenGL_Version_1_4 |
                             QGLFormat::OpenGL_Version_1_5 |
                             QGLFormat::OpenGL_Version_2_0;
-            QString minorVersion = versionString.section(QLatin1Char(' '), 0, 0).section(QLatin1Char('.'), 1, 1);
-            if (minorVersion == QChar(QLatin1Char('1')))
+            if (versionString[2].toAscii() == '1')
                 versionFlags |= QGLFormat::OpenGL_Version_2_1;
-        }
-        else if (versionString.startsWith(QLatin1String("3."))) {
-         versionFlags |= QGLFormat::OpenGL_Version_1_1 |
-                         QGLFormat::OpenGL_Version_1_2 |
-                         QGLFormat::OpenGL_Version_1_3 |
-                         QGLFormat::OpenGL_Version_1_4 |
-                         QGLFormat::OpenGL_Version_1_5 |
-                         QGLFormat::OpenGL_Version_2_0 |
-                         QGLFormat::OpenGL_Version_2_1 |
-                         QGLFormat::OpenGL_Version_3_0;
-        }
-        else
+        } else if (versionString.startsWith(QLatin1String("3."))) {
+            versionFlags |= QGLFormat::OpenGL_Version_1_1 |
+                            QGLFormat::OpenGL_Version_1_2 |
+                            QGLFormat::OpenGL_Version_1_3 |
+                            QGLFormat::OpenGL_Version_1_4 |
+                            QGLFormat::OpenGL_Version_1_5 |
+                            QGLFormat::OpenGL_Version_2_0 |
+                            QGLFormat::OpenGL_Version_2_1 |
+                            QGLFormat::OpenGL_Version_3_0;
+            switch (versionString[2].toAscii()) {
+            case '2':
+                versionFlags |= QGLFormat::OpenGL_Version_3_2;
+            case '1':
+                versionFlags |= QGLFormat::OpenGL_Version_3_1;
+            default:
+                break;
+            }
+        } else {
             qWarning("Unrecognised OpenGL version");
+        }
     }
     return versionFlags;
 }
@@ -1207,6 +1296,12 @@ QGLFormat::OpenGLVersionFlags Q_AUTOTEST_EXPORT qOpenGLVersionFlagsFromString(co
 
     \value OpenGL_Version_3_0  OpenGL version 3.0 or higher is present.
 
+    \value OpenGL_Version_3_1  OpenGL version 3.1 or higher is present.
+    Note that OpenGL version 3.1 or higher does not necessarily support all the features of
+    version 3.0 and lower.
+
+    \value OpenGL_Version_3_2  OpenGL version 3.2 or higher is present.
+
     \value OpenGL_ES_CommonLite_Version_1_0  OpenGL ES version 1.0 Common Lite or higher is present.
 
     \value OpenGL_ES_Common_Version_1_0  OpenGL ES version 1.0 Common or higher is present.
@@ -1379,14 +1474,20 @@ void QGLFormat::setDefaultOverlayFormat(const QGLFormat &f)
 
 bool operator==(const QGLFormat& a, const QGLFormat& b)
 {
-    return (int) a.d->opts == (int) b.d->opts && a.d->pln == b.d->pln && a.d->alphaSize == b.d->alphaSize
-        && a.d->accumSize == b.d->accumSize && a.d->stencilSize == b.d->stencilSize
+    return (a.d == b.d) || ((int) a.d->opts == (int) b.d->opts
+        && a.d->pln == b.d->pln
+        && a.d->alphaSize == b.d->alphaSize
+        && a.d->accumSize == b.d->accumSize
+        && a.d->stencilSize == b.d->stencilSize
         && a.d->depthSize == b.d->depthSize
         && a.d->redSize == b.d->redSize
         && a.d->greenSize == b.d->greenSize
         && a.d->blueSize == b.d->blueSize
         && a.d->numSamples == b.d->numSamples
-        && a.d->swapInterval == b.d->swapInterval;
+        && a.d->swapInterval == b.d->swapInterval
+        && a.d->majorVersion == b.d->majorVersion
+        && a.d->minorVersion == b.d->minorVersion
+        && a.d->profile == b.d->profile);
 }
 
 
@@ -1436,6 +1537,18 @@ void QGLContextGroup::removeGuard(QGLSharedResourceGuard *guard)
         m_guards = guard->m_next;
 }
 
+const QGLContext *qt_gl_transfer_context(const QGLContext *ctx)
+{
+    if (!ctx)
+        return 0;
+    QList<const QGLContext *> shares
+        (QGLContextPrivate::contextGroup(ctx)->shares());
+    if (shares.size() >= 2)
+        return (ctx == shares.at(0)) ? shares.at(1) : shares.at(0);
+    else
+        return 0;
+}
+
 QGLContextPrivate::~QGLContextPrivate()
 {
     if (!group->m_refs.deref()) {
@@ -1484,6 +1597,8 @@ void QGLContextPrivate::init(QPaintDevice *dev, const QGLFormat &format)
     current_fbo = 0;
     default_fbo = 0;
     active_engine = 0;
+    for (int i = 0; i < QT_GL_VERTEX_ARRAY_TRACKED_COUNT; ++i)
+        vertexAttributeArraysEnabledState[i] = false;
 }
 
 QGLContext* QGLContext::currentCtx = 0;
@@ -1729,12 +1844,6 @@ struct DDSFormat {
 #define GL_GENERATE_MIPMAP_HINT_SGIS  0x8192
 #endif
 
-Q_GLOBAL_STATIC(QGLShareRegister, _qgl_share_reg)
-Q_OPENGL_EXPORT QGLShareRegister* qgl_share_reg()
-{
-    return _qgl_share_reg();
-}
-
 /*!
     \class QGLContext
     \brief The QGLContext class encapsulates an OpenGL rendering context.
@@ -1874,6 +1983,35 @@ void QGLContextPrivate::cleanup()
 {
 }
 
+#define ctx q_ptr
+void QGLContextPrivate::setVertexAttribArrayEnabled(int arrayIndex, bool enabled)
+{
+    Q_ASSERT(arrayIndex < QT_GL_VERTEX_ARRAY_TRACKED_COUNT);
+    Q_ASSERT(glEnableVertexAttribArray);
+
+    if (vertexAttributeArraysEnabledState[arrayIndex] && !enabled)
+        glDisableVertexAttribArray(arrayIndex);
+
+    if (!vertexAttributeArraysEnabledState[arrayIndex] && enabled)
+        glEnableVertexAttribArray(arrayIndex);
+
+    vertexAttributeArraysEnabledState[arrayIndex] = enabled;
+}
+
+void QGLContextPrivate::syncGlState()
+{
+    Q_ASSERT(glEnableVertexAttribArray);
+    for (int i = 0; i < QT_GL_VERTEX_ARRAY_TRACKED_COUNT; ++i) {
+        if (vertexAttributeArraysEnabledState[i])
+            glEnableVertexAttribArray(i);
+        else
+            glDisableVertexAttribArray(i);
+    }
+
+}
+#undef ctx
+
+
 /*!
     \overload
 
@@ -2063,6 +2201,29 @@ QGLTexture *QGLContextPrivate::bindTexture(const QImage &image, GLenum target, G
 
 // #define QGL_BIND_TEXTURE_DEBUG
 
+// map from Qt's ARGB endianness-dependent format to GL's big-endian RGBA layout
+static inline void qgl_byteSwapImage(QImage &img, GLenum pixel_type)
+{
+    const int width = img.width();
+    const int height = img.height();
+
+    if (pixel_type == GL_UNSIGNED_INT_8_8_8_8_REV
+        || (pixel_type == GL_UNSIGNED_BYTE && QSysInfo::ByteOrder == QSysInfo::LittleEndian))
+    {
+        for (int i = 0; i < height; ++i) {
+            uint *p = (uint *) img.scanLine(i);
+            for (int x = 0; x < width; ++x)
+                p[x] = ((p[x] << 16) & 0xff0000) | ((p[x] >> 16) & 0xff) | (p[x] & 0xff00ff00);
+        }
+    } else {
+        for (int i = 0; i < height; ++i) {
+            uint *p = (uint *) img.scanLine(i);
+            for (int x = 0; x < width; ++x)
+                p[x] = (p[x] << 8) | ((p[x] >> 24) & 0xff);
+        }
+    }
+}
+
 QGLTexture* QGLContextPrivate::bindTexture(const QImage &image, GLenum target, GLint internalFormat,
                                            const qint64 key, QGLContext::BindOptions options)
 {
@@ -2215,23 +2376,7 @@ QGLTexture* QGLContextPrivate::bindTexture(const QImage &image, GLenum target, G
         // 32 in the switch above is for the RGB16 case, where we set
         // the format to GL_RGB
         Q_ASSERT(img.depth() == 32);
-        const int width = img.width();
-        const int height = img.height();
-
-        if (pixel_type == GL_UNSIGNED_INT_8_8_8_8_REV
-            || (pixel_type == GL_UNSIGNED_BYTE && QSysInfo::ByteOrder == QSysInfo::LittleEndian)) {
-            for (int i=0; i < height; ++i) {
-                uint *p = (uint *) img.scanLine(i);
-                for (int x=0; x<width; ++x)
-                    p[x] = ((p[x] << 16) & 0xff0000) | ((p[x] >> 16) & 0xff) | (p[x] & 0xff00ff00);
-            }
-        } else {
-            for (int i=0; i < height; ++i) {
-                uint *p = (uint *) img.scanLine(i);
-                for (int x=0; x<width; ++x)
-                    p[x] = (p[x] << 8) | ((p[x] >> 24) & 0xff);
-            }
-        }
+        qgl_byteSwapImage(img, pixel_type);
     }
 #ifdef QT_OPENGL_ES
     // OpenGL/ES requires that the internal and external formats be identical.
@@ -2947,7 +3092,7 @@ bool QGLContext::create(const QGLContext* shareContext)
         wd->usesDoubleBufferedGLContext = d->glFormat.doubleBuffer();
     }
     if (d->sharing)  // ok, we managed to share
-        qgl_share_reg()->addShare(this, shareContext);
+        QGLContextGroup::addShare(this, shareContext);
     return d->valid;
 }
 
@@ -3803,6 +3948,11 @@ bool QGLWidget::event(QEvent *e)
     }
 
 #if defined(QT_OPENGL_ES)
+    // A re-parent is likely to destroy the X11 window and re-create it. It is important
+    // that we free the EGL surface _before_ the winID changes - otherwise we can leak.
+    if (e->type() == QEvent::ParentAboutToChange)
+        d->glcx->d_func()->destroyEglSurfaceForDevice();
+
     if ((e->type() == QEvent::ParentChange) || (e->type() == QEvent::WindowStateChange)) {
         // The window may have been re-created during re-parent or state change - if so, the EGL
         // surface will need to be re-created.
@@ -4290,6 +4440,7 @@ static void qt_save_gl_state()
     glDisable(GL_CULL_FACE);
     glDisable(GL_LIGHTING);
     glDisable(GL_STENCIL_TEST);
+    glDisable(GL_DEPTH_TEST);
     glEnable(GL_BLEND);
     glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
 }
@@ -4343,6 +4494,10 @@ static void qt_gl_draw_text(QPainter *p, int x, int y, const QString &str,
    \note This function clears the stencil buffer.
 
    \note This function is not supported on OpenGL/ES systems.
+
+   \note This function temporarily disables depth-testing when the
+   text is drawn.
+
    \l{Overpainting Example}{Overpaint} with QPainter::drawText() instead.
 */
 
@@ -4361,9 +4516,9 @@ void QGLWidget::renderText(int x, int y, const QString &str, const QFont &font,
     int height = d->glcx->device()->height();
     bool auto_swap = autoBufferSwap();
 
+    QPaintEngine::Type oldEngineType = qgl_engine_selector()->preferredPaintEngine();
+    qgl_engine_selector()->setPreferredPaintEngine(QPaintEngine::OpenGL);
     QPaintEngine *engine = paintEngine();
-    if (engine->type() == QPaintEngine::OpenGL2)
-        static_cast<QGL2PaintEngineEx *>(engine)->setRenderTextActive(true);
     QPainter *p;
     bool reuse_painter = false;
     if (engine->isActive()) {
@@ -4383,11 +4538,6 @@ void QGLWidget::renderText(int x, int y, const QString &str, const QFont &font,
         setAutoBufferSwap(false);
         // disable glClear() as a result of QPainter::begin()
         d->disable_clear_on_painter_begin = true;
-        if (engine->type() == QPaintEngine::OpenGL2) {
-            qt_save_gl_state();
-            glMatrixMode(GL_MODELVIEW);
-            glLoadIdentity();
-        }
         p = new QPainter(this);
     }
 
@@ -4411,11 +4561,8 @@ void QGLWidget::renderText(int x, int y, const QString &str, const QFont &font,
         delete p;
         setAutoBufferSwap(auto_swap);
         d->disable_clear_on_painter_begin = false;
-        if (engine->type() == QPaintEngine::OpenGL2)
-            qt_restore_gl_state();
     }
-    if (engine->type() == QPaintEngine::OpenGL2)
-        static_cast<QGL2PaintEngineEx *>(engine)->setRenderTextActive(false);
+    qgl_engine_selector()->setPreferredPaintEngine(oldEngineType);
 #else // QT_OPENGL_ES
     Q_UNUSED(x);
     Q_UNUSED(y);
@@ -4433,6 +4580,13 @@ void QGLWidget::renderText(int x, int y, const QString &str, const QFont &font,
     have the labels move with the model as it is rotated etc.
 
     \note This function is not supported on OpenGL/ES systems.
+
+    \note If depth testing is enabled before this function is called,
+    then the drawn text will be depth-tested against the models that
+    have already been drawn in the scene.  Use \c{glDisable(GL_DEPTH_TEST)}
+    before calling this function to annotate the models without
+    depth-testing the text.
+
     \l{Overpainting Example}{Overpaint} with QPainter::drawText() instead.
 */
 void QGLWidget::renderText(double x, double y, double z, const QString &str, const QFont &font, int)
@@ -4456,9 +4610,9 @@ void QGLWidget::renderText(double x, double y, double z, const QString &str, con
                 &win_x, &win_y, &win_z);
     win_y = height - win_y; // y is inverted
 
+    QPaintEngine::Type oldEngineType = qgl_engine_selector()->preferredPaintEngine();
+    qgl_engine_selector()->setPreferredPaintEngine(QPaintEngine::OpenGL);
     QPaintEngine *engine = paintEngine();
-    if (engine->type() == QPaintEngine::OpenGL2)
-        static_cast<QGL2PaintEngineEx *>(engine)->setRenderTextActive(true);
     QPainter *p;
     bool reuse_painter = false;
     bool use_depth_testing = glIsEnabled(GL_DEPTH_TEST);
@@ -4472,8 +4626,6 @@ void QGLWidget::renderText(double x, double y, double z, const QString &str, con
         setAutoBufferSwap(false);
         // disable glClear() as a result of QPainter::begin()
         d->disable_clear_on_painter_begin = true;
-        if (engine->type() == QPaintEngine::OpenGL2)
-            qt_save_gl_state();
         p = new QPainter(this);
     }
 
@@ -4502,13 +4654,10 @@ void QGLWidget::renderText(double x, double y, double z, const QString &str, con
     } else {
         p->end();
         delete p;
-        if (engine->type() == QPaintEngine::OpenGL2)
-            qt_restore_gl_state();
         setAutoBufferSwap(auto_swap);
         d->disable_clear_on_painter_begin = false;
     }
-    if (engine->type() == QPaintEngine::OpenGL2)
-        static_cast<QGL2PaintEngineEx *>(engine)->setRenderTextActive(false);
+    qgl_engine_selector()->setPreferredPaintEngine(oldEngineType);
 #else // QT_OPENGL_ES
     Q_UNUSED(x);
     Q_UNUSED(y);
@@ -4904,8 +5053,6 @@ void QGLWidgetPrivate::initContext(QGLContext *context, const QGLWidget* shareWi
 
     if (!glcx)
         glcx = new QGLContext(QGLFormat::defaultFormat(), q);
-
-    q->setAttribute(Qt::WA_NoSystemBackground);
 }
 
 #if defined(Q_WS_X11) || defined(Q_WS_MAC) || defined(Q_WS_QWS)
@@ -4929,7 +5076,7 @@ Q_OPENGL_EXPORT const QString qt_gl_library_name()
 }
 #endif
 
-void QGLShareRegister::addShare(const QGLContext *context, const QGLContext *share) {
+void QGLContextGroup::addShare(const QGLContext *context, const QGLContext *share) {
     Q_ASSERT(context && share);
     if (context->d_ptr->group == share->d_ptr->group)
         return;
@@ -4950,11 +5097,7 @@ void QGLShareRegister::addShare(const QGLContext *context, const QGLContext *sha
     group->m_shares.append(context);
 }
 
-QList<const QGLContext *> QGLShareRegister::shares(const QGLContext *context) {
-    return context->d_ptr->group->m_shares;
-}
-
-void QGLShareRegister::removeShare(const QGLContext *context) {
+void QGLContextGroup::removeShare(const QGLContext *context) {
     // Remove the context from the group.
     QGLContextGroup *group = context->d_ptr->group;
     if (group->m_shares.isEmpty())
diff --git a/src/opengl/qgl.h b/src/opengl/qgl.h
index 079953f..c5ad945 100644
--- a/src/opengl/qgl.h
+++ b/src/opengl/qgl.h
@@ -144,6 +144,7 @@ namespace QGL
         DirectRendering         = 0x0080,
         HasOverlay              = 0x0100,
         SampleBuffers           = 0x0200,
+        DeprecatedFunctions     = 0x0400,
         SingleBuffer            = DoubleBuffer    << 16,
         NoDepthBuffer           = DepthBuffer     << 16,
         ColorIndex              = Rgba            << 16,
@@ -153,7 +154,8 @@ namespace QGL
         NoStereoBuffers         = StereoBuffers   << 16,
         IndirectRendering       = DirectRendering << 16,
         NoOverlay               = HasOverlay      << 16,
-        NoSampleBuffers         = SampleBuffers   << 16
+        NoSampleBuffers         = SampleBuffers   << 16,
+        NoDeprecatedFunctions   = DeprecatedFunctions << 16
     };
     Q_DECLARE_FLAGS(FormatOptions, FormatOption)
 }
@@ -235,7 +237,20 @@ public:
     static bool hasOpenGL();
     static bool hasOpenGLOverlays();
 
-    enum  OpenGLVersionFlag {
+    void setVersion(int major, int minor);
+    int majorVersion() const;
+    int minorVersion() const;
+
+    enum OpenGLContextProfile {
+        NoProfile,
+        CoreProfile,
+        CompatibilityProfile
+    };
+
+    void setProfile(OpenGLContextProfile profile);
+    OpenGLContextProfile profile() const;
+
+    enum OpenGLVersionFlag {
         OpenGL_Version_None               = 0x00000000,
         OpenGL_Version_1_1                = 0x00000001,
         OpenGL_Version_1_2                = 0x00000002,
@@ -249,7 +264,9 @@ public:
         OpenGL_ES_Common_Version_1_1      = 0x00000200,
         OpenGL_ES_CommonLite_Version_1_1  = 0x00000400,
         OpenGL_ES_Version_2_0             = 0x00000800,
-        OpenGL_Version_3_0                = 0x00001000
+        OpenGL_Version_3_0                = 0x00001000,
+        OpenGL_Version_3_1                = 0x00002000,
+        OpenGL_Version_3_2                = 0x00004000
     };
     Q_DECLARE_FLAGS(OpenGLVersionFlags, OpenGLVersionFlag)
 
@@ -393,11 +410,12 @@ private:
     friend class QOpenGLPaintEnginePrivate;
     friend class QGL2PaintEngineEx;
     friend class QGL2PaintEngineExPrivate;
+    friend class QGLEngineShaderManager;
     friend class QGLWindowSurface;
     friend class QGLPixmapData;
     friend class QGLPixmapFilterBase;
     friend class QGLTextureGlyphCache;
-    friend class QGLShareRegister;
+    friend class QGLContextGroup;
     friend class QGLSharedResourceGuard;
     friend class QGLPixmapBlurFilter;
     friend QGLFormat::OpenGLVersionFlags QGLFormat::openGLVersionFlags();
@@ -546,6 +564,7 @@ private:
     friend class QGLPixelBuffer;
     friend class QGLPixelBufferPrivate;
     friend class QGLContext;
+    friend class QGLContextPrivate;
     friend class QGLOverlayWidget;
     friend class QOpenGLPaintEngine;
     friend class QGLPaintDevice;
diff --git a/src/opengl/qgl_egl.cpp b/src/opengl/qgl_egl.cpp
index fbf0349..084db32 100644
--- a/src/opengl/qgl_egl.cpp
+++ b/src/opengl/qgl_egl.cpp
@@ -142,19 +142,7 @@ void QGLContext::reset()
     d->cleanup();
     doneCurrent();
     if (d->eglContext) {
-        if (d->eglSurface != EGL_NO_SURFACE) {
-#ifdef Q_WS_X11
-            // Make sure we don't call eglDestroySurface on a surface which
-            // was created for a different winId:
-            if (d->paintDevice->devType() == QInternal::Widget) {
-                QGLWidget* w = static_cast<QGLWidget*>(d->paintDevice);
-
-                if (w->d_func()->eglSurfaceWindowId == w->winId())
-                    eglDestroySurface(d->eglContext->display(), d->eglSurface);
-            } else
-#endif
-                eglDestroySurface(d->eglContext->display(), d->eglSurface);
-        }
+        d->destroyEglSurfaceForDevice();
         delete d->eglContext;
     }
     d->eglContext = 0;
@@ -164,7 +152,7 @@ void QGLContext::reset()
     d->valid = false;
     d->transpColor = QColor();
     d->initDone = false;
-    qgl_share_reg()->removeShare(this);
+    QGLContextGroup::removeShare(this);
 }
 
 void QGLContext::makeCurrent()
@@ -198,6 +186,26 @@ void QGLContext::swapBuffers() const
     d->eglContext->swapBuffers(d->eglSurface);
 }
 
+void QGLContextPrivate::destroyEglSurfaceForDevice()
+{
+    if (eglSurface != EGL_NO_SURFACE) {
+#ifdef Q_WS_X11
+        // Make sure we don't call eglDestroySurface on a surface which
+        // was created for a different winId:
+        if (paintDevice->devType() == QInternal::Widget) {
+            QGLWidget* w = static_cast<QGLWidget*>(paintDevice);
+
+            if (w->d_func()->eglSurfaceWindowId == w->winId())
+                eglDestroySurface(eglContext->display(), eglSurface);
+            else
+                qWarning("WARNING: Potential EGL surface leak!");
+        } else
+#endif
+            eglDestroySurface(eglContext->display(), eglSurface);
+        eglSurface = EGL_NO_SURFACE;
+    }
+}
+
 void QGLWidget::setMouseTracking(bool enable)
 {
     QWidget::setMouseTracking(enable);
diff --git a/src/opengl/qgl_mac.mm b/src/opengl/qgl_mac.mm
index 4dd822d..8ecc48b 100644
--- a/src/opengl/qgl_mac.mm
+++ b/src/opengl/qgl_mac.mm
@@ -476,7 +476,7 @@ void QGLContext::reset()
     d->valid = false;
     d->transpColor = QColor();
     d->initDone = false;
-    qgl_share_reg()->removeShare(this);
+    QGLContextGroup::removeShare(this);
 }
 
 void QGLContext::makeCurrent()
diff --git a/src/opengl/qgl_p.h b/src/opengl/qgl_p.h
index 11770d3..37781d5 100644
--- a/src/opengl/qgl_p.h
+++ b/src/opengl/qgl_p.h
@@ -132,11 +132,15 @@ public:
     QGLFormatPrivate()
         : ref(1)
     {
-        opts = QGL::DoubleBuffer | QGL::DepthBuffer | QGL::Rgba | QGL::DirectRendering | QGL::StencilBuffer;
+        opts = QGL::DoubleBuffer | QGL::DepthBuffer | QGL::Rgba | QGL::DirectRendering
+             | QGL::StencilBuffer | QGL::DeprecatedFunctions;
         pln = 0;
         depthSize = accumSize = stencilSize = redSize = greenSize = blueSize = alphaSize = -1;
         numSamples = -1;
         swapInterval = -1;
+        majorVersion = 1;
+        minorVersion = 0;
+        profile = QGLFormat::NoProfile;
     }
     QGLFormatPrivate(const QGLFormatPrivate *other)
         : ref(1),
@@ -150,7 +154,10 @@ public:
           blueSize(other->blueSize),
           alphaSize(other->alphaSize),
           numSamples(other->numSamples),
-          swapInterval(other->swapInterval)
+          swapInterval(other->swapInterval),
+          majorVersion(other->majorVersion),
+          minorVersion(other->minorVersion),
+          profile(other->profile)
     {
     }
     QAtomicInt ref;
@@ -165,6 +172,9 @@ public:
     int alphaSize;
     int numSamples;
     int swapInterval;
+    int majorVersion;
+    int minorVersion;
+    QGLFormat::OpenGLContextProfile profile;
 };
 
 class QGLWidgetPrivate : public QWidgetPrivate
@@ -222,9 +232,8 @@ class QGLSharedResourceGuard;
 typedef QHash<QString, GLuint> QGLDDSCache;
 
 // QGLContextPrivate has the responsibility of creating context groups.
-// QGLContextPrivate and QGLShareRegister will both maintain the reference counter and destroy
+// QGLContextPrivate maintains the reference counter and destroys
 // context groups when needed.
-// QGLShareRegister has the responsibility of keeping the context pointer up to date.
 class QGLContextGroup
 {
 public:
@@ -233,9 +242,13 @@ public:
     QGLExtensionFuncs &extensionFuncs() {return m_extensionFuncs;}
     const QGLContext *context() const {return m_context;}
     bool isSharing() const { return m_shares.size() >= 2; }
+    QList<const QGLContext *> shares() const { return m_shares; }
 
     void addGuard(QGLSharedResourceGuard *guard);
     void removeGuard(QGLSharedResourceGuard *guard);
+
+    static void addShare(const QGLContext *context, const QGLContext *share);
+    static void removeShare(const QGLContext *context);
 private:
     QGLContextGroup(const QGLContext *context) : m_context(context), m_guards(0), m_refs(1) { }
 
@@ -249,14 +262,21 @@ private:
 
     void cleanupResources(const QGLContext *ctx);
 
-    friend class QGLShareRegister;
     friend class QGLContext;
     friend class QGLContextPrivate;
     friend class QGLContextResource;
 };
 
+// Get the context that resources for "ctx" will transfer to once
+// "ctx" is destroyed.  Returns null if nothing is sharing with ctx.
+Q_OPENGL_EXPORT const QGLContext *qt_gl_transfer_context(const QGLContext *);
+
 class QGLTexture;
 
+// This probably needs to grow to GL_MAX_VERTEX_ATTRIBS, but 3 is ok for now as that's
+// all the GL2 engine uses:
+#define QT_GL_VERTEX_ARRAY_TRACKED_COUNT 3
+
 class QGLContextPrivate
 {
     Q_DECLARE_PUBLIC(QGLContext)
@@ -276,6 +296,13 @@ public:
 
     void cleanup();
 
+    void setVertexAttribArrayEnabled(int arrayIndex, bool enabled = true);
+    void syncGlState(); // Makes sure the GL context's state is what we think it is
+
+#if defined(Q_WS_WIN)
+    void updateFormatVersion();
+#endif
+
 #if defined(Q_WS_WIN)
     HGLRC rc;
     HDC dc;
@@ -288,6 +315,7 @@ public:
 #if defined(QT_OPENGL_ES)
     QEglContext *eglContext;
     EGLSurface eglSurface;
+    void destroyEglSurfaceForDevice();
 #elif defined(Q_WS_X11) || defined(Q_WS_MAC)
     void* cx;
 #endif
@@ -331,6 +359,8 @@ public:
     GLuint default_fbo;
     QPaintEngine *active_engine;
 
+    bool vertexAttributeArraysEnabledState[QT_GL_VERTEX_ARRAY_TRACKED_COUNT];
+
     static inline QGLContextGroup *contextGroup(const QGLContext *ctx) { return ctx->d_ptr->group; }
 
 #ifdef Q_WS_WIN
@@ -394,19 +424,6 @@ public:
 Q_DECLARE_OPERATORS_FOR_FLAGS(QGLExtensions::Extensions)
 
 
-class Q_OPENGL_EXPORT QGLShareRegister
-{
-public:
-    QGLShareRegister() {}
-    ~QGLShareRegister() {}
-
-    void addShare(const QGLContext *context, const QGLContext *share);
-    QList<const QGLContext *> shares(const QGLContext *context);
-    void removeShare(const QGLContext *context);
-};
-
-extern Q_OPENGL_EXPORT QGLShareRegister* qgl_share_reg();
-
 // Temporarily make a context current if not already current or
 // shared with the current contex.  The previous context is made
 // current when the object goes out of scope.
diff --git a/src/opengl/qgl_win.cpp b/src/opengl/qgl_win.cpp
index 5b5820a..357f726 100644
--- a/src/opengl/qgl_win.cpp
+++ b/src/opengl/qgl_win.cpp
@@ -122,6 +122,30 @@ typedef bool (APIENTRY *PFNWGLCHOOSEPIXELFORMATARB)(HDC hdc,
 #define WGL_TYPE_COLORINDEX_ARB        0x202C
 #endif
 
+#ifndef WGL_ARB_create_context
+#define WGL_CONTEXT_MAJOR_VERSION_ARB               0x2091
+#define WGL_CONTEXT_MINOR_VERSION_ARB               0x2092
+#define WGL_CONTEXT_LAYER_PLANE_ARB                 0x2093
+#define WGL_CONTEXT_FLAGS_ARB                       0x2094
+#define WGL_CONTEXT_PROFILE_MASK_ARB                0x9126
+#define WGL_CONTEXT_DEBUG_BIT_ARB                   0x0001
+#define WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB      0x0002
+#define WGL_CONTEXT_CORE_PROFILE_BIT_ARB            0x0001
+#define WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB   0x0002
+// Error codes returned by GetLastError().
+#define ERROR_INVALID_VERSION_ARB                   0x2095
+#define ERROR_INVALID_PROFILE_ARB                   0x2096
+#endif
+
+#ifndef GL_VERSION_3_2
+#define GL_CONTEXT_PROFILE_MASK                     0x9126
+#define GL_MAJOR_VERSION                            0x821B
+#define GL_MINOR_VERSION                            0x821C
+#define GL_NUM_EXTENSIONS                           0x821D
+#define GL_CONTEXT_FLAGS                            0x821E
+#define GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT      0x0001
+#endif
+
 QT_BEGIN_NAMESPACE
 
 class QGLCmapPrivate
@@ -681,8 +705,118 @@ public:
     WId dmy_id;
 };
 
+static bool qgl_create_context(HDC hdc, QGLContextPrivate *d, QGLContextPrivate *shareContext)
+{
+    d->rc = 0;
+
+    typedef HGLRC (APIENTRYP PFNWGLCREATECONTEXTATTRIBSARB)(HDC, HGLRC, const int *);
+    PFNWGLCREATECONTEXTATTRIBSARB wglCreateContextAttribsARB =
+        (PFNWGLCREATECONTEXTATTRIBSARB) wglGetProcAddress("wglCreateContextAttribsARB");
+    if (wglCreateContextAttribsARB) {
+        int attributes[11];
+        int attribIndex = 0;
+        const int major = d->reqFormat.majorVersion();
+        const int minor = d->reqFormat.minorVersion();
+        attributes[attribIndex++] = WGL_CONTEXT_MAJOR_VERSION_ARB;
+        attributes[attribIndex++] = major;
+        attributes[attribIndex++] = WGL_CONTEXT_MINOR_VERSION_ARB;
+        attributes[attribIndex++] = minor;
+
+        if (major >= 3 && !d->reqFormat.testOption(QGL::DeprecatedFunctions)) {
+            attributes[attribIndex++] = WGL_CONTEXT_FLAGS_ARB;
+            attributes[attribIndex++] = WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
+        }
+
+        if ((major == 3 && minor >= 2) || major > 3) {
+            switch (d->reqFormat.profile()) {
+            case QGLFormat::NoProfile:
+                break;
+            case QGLFormat::CoreProfile:
+                attributes[attribIndex++] = WGL_CONTEXT_PROFILE_MASK_ARB;
+                attributes[attribIndex++] = WGL_CONTEXT_CORE_PROFILE_BIT_ARB;
+                break;
+            case QGLFormat::CompatibilityProfile:
+                attributes[attribIndex++] = WGL_CONTEXT_PROFILE_MASK_ARB;
+                attributes[attribIndex++] = WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB;
+                break;
+            default:
+                qWarning("QGLContext::chooseContext(): Context profile not supported.");
+                return false;
+            }
+        }
+
+        if (d->reqFormat.plane() != 0) {
+            attributes[attribIndex++] = WGL_CONTEXT_LAYER_PLANE_ARB;
+            attributes[attribIndex++] = d->reqFormat.plane();
+        }
+
+        attributes[attribIndex++] = 0; // Terminate list.
+        d->rc = wglCreateContextAttribsARB(hdc, shareContext && shareContext->valid
+                                           ? shareContext->rc : 0, attributes);
+        if (d->rc) {
+            if (shareContext)
+                shareContext->sharing = d->sharing = true;
+            return true;
+        }
+    }
+
+    d->rc = wglCreateLayerContext(hdc, d->reqFormat.plane());
+    if (d->rc && shareContext && shareContext->valid)
+        shareContext->sharing = d->sharing = wglShareLists(shareContext->rc, d->rc);
+    return d->rc != 0;
+}
+
+void QGLContextPrivate::updateFormatVersion()
+{
+    const GLubyte *s = glGetString(GL_VERSION);
+
+    if (!(s && s[0] >= '0' && s[0] <= '9' && s[1] == '.' && s[2] >= '0' && s[2] <= '9')) {
+        if (!s)
+            qWarning("QGLContext::chooseContext(): OpenGL version string is null.");
+        else
+            qWarning("QGLContext::chooseContext(): Unexpected OpenGL version string format.");
+        glFormat.setVersion(0, 0);
+        glFormat.setProfile(QGLFormat::NoProfile);
+        glFormat.setOption(QGL::DeprecatedFunctions);
+        return;
+    }
+
+    int major = s[0] - '0';
+    int minor = s[2] - '0';
+    glFormat.setVersion(major, minor);
+
+    if (major < 3) {
+        glFormat.setProfile(QGLFormat::NoProfile);
+        glFormat.setOption(QGL::DeprecatedFunctions);
+    } else {
+        GLint value = 0;
+        if (major > 3 || minor >= 2)
+            glGetIntegerv(GL_CONTEXT_PROFILE_MASK, &value);
+
+        switch (value) {
+        case WGL_CONTEXT_CORE_PROFILE_BIT_ARB:
+            glFormat.setProfile(QGLFormat::CoreProfile);
+            break;
+        case WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB:
+            glFormat.setProfile(QGLFormat::CompatibilityProfile);
+            break;
+        default:
+            glFormat.setProfile(QGLFormat::NoProfile);
+            break;
+        }
+
+        glGetIntegerv(GL_CONTEXT_FLAGS, &value);
+        if (value & GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT)
+            glFormat.setOption(QGL::NoDeprecatedFunctions);
+        else
+            glFormat.setOption(QGL::DeprecatedFunctions);
+    }
+}
+
 bool QGLContext::chooseContext(const QGLContext* shareContext)
 {
+    QGLContextPrivate *share = shareContext ? const_cast<QGLContext *>(shareContext)->d_func() : 0;
+
     Q_D(QGLContext);
     // workaround for matrox driver:
     // make a cheap call to opengl to force loading of DLL
@@ -740,8 +874,7 @@ bool QGLContext::chooseContext(const QGLContext* shareContext)
             goto end;
         }
 
-        d->rc = wglCreateLayerContext(myDc, d->glFormat.plane());
-        if (!d->rc) {
+        if (!qgl_create_context(myDc, d, share)) {
             qwglError("QGLContext::chooseContext()", "CreateLayerContext");
             result = false;
             goto end;
@@ -791,16 +924,7 @@ bool QGLContext::chooseContext(const QGLContext* shareContext)
             d->cmap = new QGLCmap(1 << lpfd.cColorBits);
             d->cmap->setEntry(lpfd.crTransparent, qRgb(1, 2, 3));//, QGLCmap::Reserved);
         }
-
-        if (shareContext && shareContext->isValid()) {
-            QGLContext *share = const_cast<QGLContext *>(shareContext);
-            d->sharing = (wglShareLists(shareContext->d_func()->rc, d->rc) != 0);
-            share->d_func()->sharing = d->sharing;
-        }
-
-        goto end;
-    }
-    {
+    } else {
         PIXELFORMATDESCRIPTOR pfd;
         PIXELFORMATDESCRIPTOR realPfd;
         d->pixelFormatId = choosePixelFormat(&pfd, myDc);
@@ -839,17 +963,12 @@ bool QGLContext::chooseContext(const QGLContext* shareContext)
             goto end;
         }
 
-        if (!(d->rc = wglCreateLayerContext(myDc, 0))) {
+        if (!qgl_create_context(myDc, d, share)) {
             qwglError("QGLContext::chooseContext()", "wglCreateContext");
             result = false;
             goto end;
         }
 
-        if (shareContext && shareContext->isValid()) {
-            d->sharing = (wglShareLists(shareContext->d_func()->rc, d->rc) != 0);
-            const_cast<QGLContext *>(shareContext)->d_func()->sharing = d->sharing;
-        }
-
         if(!deviceIsPixmap()) {
             QRgb* pal = qgl_create_rgb_palette(&realPfd);
             if (pal) {
@@ -864,6 +983,9 @@ bool QGLContext::chooseContext(const QGLContext* shareContext)
 end:
     // vblanking
     wglMakeCurrent(myDc, d->rc);
+    if (d->rc)
+        d->updateFormatVersion();
+
     typedef BOOL (APIENTRYP PFNWGLSWAPINTERVALEXT) (int interval);
     typedef int (APIENTRYP PFNWGLGETSWAPINTERVALEXT) (void);
     PFNWGLSWAPINTERVALEXT wglSwapIntervalEXT = (PFNWGLSWAPINTERVALEXT) wglGetProcAddress("wglSwapIntervalEXT");
@@ -1145,7 +1267,7 @@ void QGLContext::reset()
     delete d->cmap;
     d->cmap = 0;
     d->initDone = false;
-    qgl_share_reg()->removeShare(this);
+    QGLContextGroup::removeShare(this);
 }
 
 //
diff --git a/src/opengl/qgl_x11.cpp b/src/opengl/qgl_x11.cpp
index 9c3fc79..9fca28c 100644
--- a/src/opengl/qgl_x11.cpp
+++ b/src/opengl/qgl_x11.cpp
@@ -825,7 +825,7 @@ void QGLContext::reset()
     d->valid = false;
     d->transpColor = QColor();
     d->initDone = false;
-    qgl_share_reg()->removeShare(this);
+    QGLContextGroup::removeShare(this);
 }
 
 
@@ -1132,6 +1132,72 @@ void *QGLContext::getProcAddress(const QString &proc) const
     return glXGetProcAddressARB(reinterpret_cast<const GLubyte *>(proc.toLatin1().data()));
 }
 
+//
+// This class is used to create a temporary, minimal GL context, which is used
+// to retrive GL version and extension info. It's significantly faster to
+// construct than a QGLWidget, and it doesn't have the recursive creation
+// problem that QGLWidget would have. E.g. creating a temporary QGLWidget to
+// retrieve GL info as part of the QGLWidget initialization.
+//
+class QGLTempContext
+{
+public:
+    QGLTempContext(int screen = 0) :
+            initialized(false),
+            old_drawable(0),
+            old_context(0)
+    {
+        int attribs[] = {GLX_RGBA, XNone};
+        XVisualInfo *vi = glXChooseVisual(X11->display, screen, attribs);
+        if (!vi) {
+            qWarning("QGLTempContext: No GL capable X visuals available.");
+            return;
+        }
+
+        int useGL;
+        glXGetConfig(X11->display, vi, GLX_USE_GL, &useGL);
+        if (!useGL) {
+            XFree(vi);
+            return;
+        }
+
+        old_drawable = glXGetCurrentDrawable();
+        old_context = glXGetCurrentContext();
+
+        XSetWindowAttributes a;
+        a.colormap = qt_gl_choose_cmap(X11->display, vi);
+        drawable = XCreateWindow(X11->display, RootWindow(X11->display, screen),
+                                 0, 0, 1, 1, 0,
+                                 vi->depth, InputOutput, vi->visual,
+                                 CWColormap, &a);
+        context = glXCreateContext(X11->display, vi, 0, True);
+        if (context && glXMakeCurrent(X11->display, drawable, context)) {
+            initialized = true;
+        } else {
+            qWarning("QGLTempContext: Unable to create GL context.");
+            XDestroyWindow(X11->display, drawable);
+        }
+        XFree(vi);
+    }
+
+    ~QGLTempContext() {
+        if (initialized) {
+            glXMakeCurrent(X11->display, 0, 0);
+            glXDestroyContext(X11->display, context);
+            XDestroyWindow(X11->display, drawable);
+        }
+        if (old_drawable && old_context)
+            glXMakeCurrent(X11->display, old_drawable, old_context);
+    }
+
+private:
+    bool initialized;
+    Window drawable;
+    GLXContext context;
+    GLXDrawable old_drawable;
+    GLXContext old_context;
+};
+
 /*****************************************************************************
   QGLOverlayWidget (Internal overlay class for X11)
  *****************************************************************************/
@@ -1574,8 +1640,7 @@ void QGLExtensions::init()
         return;
     init_done = true;
 
-    QGLWidget dmy;
-    dmy.makeCurrent();
+    QGLTempContext context;
     init_extensions();
 
     // nvidia 9x.xx unix drivers contain a bug which requires us to call glFinish before releasing an fbo
diff --git a/src/opengl/qgl_x11egl.cpp b/src/opengl/qgl_x11egl.cpp
index a868e83..d6281f7 100644
--- a/src/opengl/qgl_x11egl.cpp
+++ b/src/opengl/qgl_x11egl.cpp
@@ -52,6 +52,116 @@
 
 QT_BEGIN_NAMESPACE
 
+
+bool qt_egl_setup_x11_visual(XVisualInfo &vi, EGLDisplay display, EGLConfig config,
+                             const QX11Info &x11Info, bool useArgbVisual);
+//
+// QGLTempContext is a class for creating a temporary GL context
+// (which is needed during QGLWidget initialization to retrieve GL
+// extension info).  Faster to construct than a full QGLWidget.
+//
+class QGLTempContext
+{
+public:
+    QGLTempContext(int screen = 0) :
+        initialized(false),
+        window(0),
+        context(0),
+        surface(0)
+    {
+        display = eglGetDisplay(EGLNativeDisplayType(X11->display));
+
+        if (!eglInitialize(display, NULL, NULL)) {
+            qWarning("QGLTempContext: Unable to initialize EGL display.");
+            return;
+        }
+
+        EGLConfig config;
+        int numConfigs = 0;
+        EGLint attribs[] = {
+            EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
+#ifdef QT_OPENGL_ES_2
+            EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
+#endif
+            EGL_NONE
+        };
+
+        eglChooseConfig(display, attribs, &config, 1, &numConfigs);
+        if (!numConfigs) {
+            qWarning("QGLTempContext: No EGL configurations available.");
+            return;
+        }
+
+        XVisualInfo visualInfo;
+        XVisualInfo *vi;
+        int numVisuals;
+        EGLint id = 0;
+
+        eglGetConfigAttrib(display, config, EGL_NATIVE_VISUAL_ID, &id);
+        if (id == 0) {
+            // EGL_NATIVE_VISUAL_ID is optional and might not be supported
+            // on some implementations - we'll have to do it the hard way
+            QX11Info xinfo;
+            qt_egl_setup_x11_visual(visualInfo, display, config, xinfo, false);
+        } else {
+            visualInfo.visualid = id;
+        }
+        vi = XGetVisualInfo(X11->display, VisualIDMask, &visualInfo, &numVisuals);
+        if (!vi || numVisuals < 1) {
+            qWarning("QGLTempContext: Unable to get X11 visual info id.");
+            return;
+        }
+
+        window = XCreateWindow(X11->display, RootWindow(X11->display, screen),
+                               0, 0, 1, 1, 0,
+                               vi->depth, InputOutput, vi->visual,
+                               0, 0);
+
+        surface = eglCreateWindowSurface(display, config, (EGLNativeWindowType) window, NULL);
+
+        if (surface == EGL_NO_SURFACE) {
+            qWarning("QGLTempContext: Error creating EGL surface.");
+            XFree(vi);
+            XDestroyWindow(X11->display, window);
+            return;
+        }
+
+        EGLint contextAttribs[] = {
+#ifdef QT_OPENGL_ES_2
+            EGL_CONTEXT_CLIENT_VERSION, 2,
+#endif
+            EGL_NONE
+        };
+        context = eglCreateContext(display, config, 0, contextAttribs);
+        if (context != EGL_NO_CONTEXT
+            && eglMakeCurrent(display, surface, surface, context))
+        {
+            initialized = true;
+        } else {
+            qWarning("QGLTempContext: Error creating EGL context.");
+            eglDestroySurface(display, surface);
+            XDestroyWindow(X11->display, window);
+        }
+        XFree(vi);
+    }
+
+    ~QGLTempContext() {
+        if (initialized) {
+            eglMakeCurrent(display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+            eglDestroyContext(display, context);
+            eglDestroySurface(display, surface);
+            XDestroyWindow(X11->display, window);
+        }
+    }
+
+private:
+    bool initialized;
+    Window window;
+    EGLContext context;
+    EGLSurface surface;
+    EGLDisplay display;
+};
+
 bool QGLFormat::hasOpenGLOverlays()
 {
     return false;
@@ -173,10 +283,16 @@ void QGLWidget::updateOverlayGL()
     //handle overlay
 }
 
+//#define QT_DEBUG_X11_VISUAL_SELECTION 1
+
 bool qt_egl_setup_x11_visual(XVisualInfo &vi, EGLDisplay display, EGLConfig config, const QX11Info &x11Info, bool useArgbVisual)
 {
     bool foundVisualIsArgb = useArgbVisual;
 
+#ifdef QT_DEBUG_X11_VISUAL_SELECTION
+    qDebug("qt_egl_setup_x11_visual() - useArgbVisual=%d", useArgbVisual);
+#endif
+
     memset(&vi, 0, sizeof(XVisualInfo));
 
     EGLint eglConfigColorSize;
@@ -199,7 +315,9 @@ bool qt_egl_setup_x11_visual(XVisualInfo &vi, EGLDisplay display, EGLConfig conf
                 XRenderPictFormat *format;
                 format = XRenderFindVisualFormat(x11Info.display(), chosenVisualInfo->visual);
                 if (format->type == PictTypeDirect && format->direct.alphaMask) {
-//                    qDebug("Using ARGB X Visual ID (%d) provided by EGL", (int)vi.visualid);
+#ifdef QT_DEBUG_X11_VISUAL_SELECTION
+                    qDebug("Using ARGB X Visual ID (%d) provided by EGL", (int)vi.visualid);
+#endif
                     foundVisualIsArgb = true;
                     vi = *chosenVisualInfo;
                 }
@@ -212,7 +330,9 @@ bool qt_egl_setup_x11_visual(XVisualInfo &vi, EGLDisplay display, EGLConfig conf
 #endif
             {
                 if (eglConfigColorSize == chosenVisualInfo->depth) {
-//                    qDebug("Using opaque X Visual ID (%d) provided by EGL", (int)vi.visualid);
+#ifdef QT_DEBUG_X11_VISUAL_SELECTION
+                    qDebug("Using opaque X Visual ID (%d) provided by EGL", (int)vi.visualid);
+#endif
                     vi = *chosenVisualInfo;
                 } else
                     qWarning("Warning: EGL suggested using X visual ID %d (%d bpp) for config %d (%d bpp), but the depths do not match!",
@@ -229,7 +349,7 @@ bool qt_egl_setup_x11_visual(XVisualInfo &vi, EGLDisplay display, EGLConfig conf
 
     // If EGL does not know the visual ID, so try to select an appropriate one ourselves, first
     // using XRender if we're supposed to have an alpha, then falling back to XGetVisualInfo
-          
+
 #if !defined(QT_NO_XRENDER)
     if (vi.visualid == 0 && useArgbVisual) {
         // Try to use XRender to find an ARGB visual we can use
@@ -248,7 +368,9 @@ bool qt_egl_setup_x11_visual(XVisualInfo &vi, EGLDisplay display, EGLConfig conf
             if (format->type == PictTypeDirect && format->direct.alphaMask) {
                 vi = matchingVisuals[i];
                 foundVisualIsArgb = true;
-//                qDebug("Using X Visual ID (%d) for ARGB visual as provided by XRender", (int)vi.visualid);
+#ifdef QT_DEBUG_X11_VISUAL_SELECTION
+                qDebug("Using X Visual ID (%d) for ARGB visual as provided by XRender", (int)vi.visualid);
+#endif
                 break;
             }
         }
@@ -272,24 +394,28 @@ bool qt_egl_setup_x11_visual(XVisualInfo &vi, EGLDisplay display, EGLConfig conf
             } else
                 qWarning("         - Falling back to X11 suggested depth (%d)", depth);
         }
-//        else
-//            qDebug("Using X Visual ID (%d) for EGL provided depth (%d)", (int)vi.visualid, depth);
+#ifdef QT_DEBUG_X11_VISUAL_SELECTION
+        else
+            qDebug("Using X Visual ID (%d) for EGL provided depth (%d)", (int)vi.visualid, depth);
+#endif
 
         // Don't try to use ARGB now unless the visual is 32-bit - even then it might stil fail :-(
         if (useArgbVisual)
             foundVisualIsArgb = vi.depth == 32; //### We might at some point (soon) get ARGB4444
     }
 
-//    qDebug("Visual Info:");
-//    qDebug("   bits_per_rgb=%d", vi.bits_per_rgb);
-//    qDebug("   red_mask=0x%x", vi.red_mask);
-//    qDebug("   green_mask=0x%x", vi.green_mask);
-//    qDebug("   blue_mask=0x%x", vi.blue_mask);
-//    qDebug("   colormap_size=%d", vi.colormap_size);
-//    qDebug("   c_class=%d", vi.c_class);
-//    qDebug("   depth=%d", vi.depth);
-//    qDebug("   screen=%d", vi.screen);
-//    qDebug("   visualid=%d", vi.visualid);
+#ifdef QT_DEBUG_X11_VISUAL_SELECTION
+    qDebug("Visual Info:");
+    qDebug("   bits_per_rgb=%d", vi.bits_per_rgb);
+    qDebug("   red_mask=0x%x", vi.red_mask);
+    qDebug("   green_mask=0x%x", vi.green_mask);
+    qDebug("   blue_mask=0x%x", vi.blue_mask);
+    qDebug("   colormap_size=%d", vi.colormap_size);
+    qDebug("   c_class=%d", vi.c_class);
+    qDebug("   depth=%d", vi.depth);
+    qDebug("   screen=%d", vi.screen);
+    qDebug("   visualid=%d", vi.visualid);
+#endif
     return foundVisualIsArgb;
 }
 
@@ -320,7 +446,7 @@ void QGLWidget::setContext(QGLContext *context, const QGLContext* shareContext,
     // If the application has set WA_TranslucentBackground and not explicitly set
     // the alpha buffer size to zero, modify the format so it have an alpha channel
     QGLFormat& fmt = d->glcx->d_func()->glFormat;
-    const bool tryArgbVisual = testAttribute(Qt::WA_TranslucentBackground);
+    const bool tryArgbVisual = testAttribute(Qt::WA_TranslucentBackground) || fmt.alpha();
     if (tryArgbVisual && fmt.alphaBufferSize() == -1)
         fmt.setAlphaBufferSize(1);
 
@@ -430,12 +556,8 @@ void QGLExtensions::init()
     init_done = true;
 
     // We need a context current to initialize the extensions.
-    QGLWidget tmpWidget;
-    tmpWidget.makeCurrent();
-
+    QGLTempContext context;
     init_extensions();
-
-    tmpWidget.doneCurrent();
 }
 
 // Re-creates the EGL surface if the window ID has changed or if force is true
diff --git a/src/opengl/qglframebufferobject.cpp b/src/opengl/qglframebufferobject.cpp
index d0297c9..4b5c30a 100644
--- a/src/opengl/qglframebufferobject.cpp
+++ b/src/opengl/qglframebufferobject.cpp
@@ -597,6 +597,12 @@ void QGLFramebufferObjectPrivate::init(QGLFramebufferObject *q, const QSize &sz,
     the constructors that take a QGLFramebufferObject parameter, and set the
     QGLFramebufferObject::samples() property to a non-zero value.
 
+    When painting to a QGLFramebufferObject using QPainter, the state of
+    the current GL context will be altered by the paint engine to reflect
+    its needs.  Applications should not rely upon the GL state being reset
+    to its original conditions, particularly the current shader program,
+    GL viewport, texture units, and drawing modes.
+
     For multisample framebuffer objects a color render buffer is created,
     otherwise a texture with the specified texture target is created.
     The color render buffer or texture will have the specified internal
diff --git a/src/opengl/qglpixelbuffer.cpp b/src/opengl/qglpixelbuffer.cpp
index 7c97ebb..fab6efc 100644
--- a/src/opengl/qglpixelbuffer.cpp
+++ b/src/opengl/qglpixelbuffer.cpp
@@ -127,7 +127,7 @@ void QGLPixelBufferPrivate::common_init(const QSize &size, const QGLFormat &form
         qctx = new QGLContext(format);
         qctx->d_func()->sharing = (shareWidget != 0);
         if (shareWidget != 0 && shareWidget->d_func()->glcx) {
-            qgl_share_reg()->addShare(qctx, shareWidget->d_func()->glcx);
+            QGLContextGroup::addShare(qctx, shareWidget->d_func()->glcx);
             shareWidget->d_func()->glcx->d_func()->sharing = true;
         }
 
diff --git a/src/opengl/qglpixmapfilter.cpp b/src/opengl/qglpixmapfilter.cpp
index c478630..d4bcbe9 100644
--- a/src/opengl/qglpixmapfilter.cpp
+++ b/src/opengl/qglpixmapfilter.cpp
@@ -55,11 +55,17 @@
 #include "qgl_p.h"
 
 #include "private/qapplication_p.h"
+#include "private/qdrawhelper_p.h"
+#include "private/qmemrotate_p.h"
 #include "private/qmath_p.h"
 #include "qmath.h"
 
 QT_BEGIN_NAMESPACE
 
+// qpixmapfilter.cpp
+void qt_blurImage(QImage &blurImage, qreal radius, bool quality, int transposed = 0);
+QImage qt_halfScaled(const QImage &source);
+
 void QGLPixmapFilterBase::bindTexture(const QPixmap &src) const
 {
     const_cast<QGLContext *>(QGLContext::currentContext())->d_func()->bindTexture(src, GL_TEXTURE_2D, GL_RGBA, QGLContext::BindOptions(QGLContext::DefaultBindOption | QGLContext::MemoryManagedBindOption));
@@ -102,48 +108,21 @@ private:
 class QGLPixmapBlurFilter : public QGLCustomShaderStage, public QGLPixmapFilter<QPixmapBlurFilter>
 {
 public:
-    QGLPixmapBlurFilter(QGraphicsBlurEffect::BlurHints hints);
-
-    void setUniforms(QGLShaderProgram *program);
-
-    static QByteArray generateGaussianShader(int radius, bool singlePass = false, bool dropShadow = false);
+    QGLPixmapBlurFilter();
 
 protected:
     bool processGL(QPainter *painter, const QPointF &pos, const QPixmap &src, const QRectF &srcRect) const;
-
-private:
-
-    mutable QSize m_textureSize;
-    mutable bool m_horizontalBlur;
-    mutable bool m_singlePass;
-    mutable bool m_animatedBlur;
-
-    mutable qreal m_t;
-    mutable QSize m_targetSize;
-
-    mutable bool m_haveCached;
-    mutable int m_cachedRadius;
-    mutable QGraphicsBlurEffect::BlurHints m_hints;
 };
 
 class QGLPixmapDropShadowFilter : public QGLCustomShaderStage, public QGLPixmapFilter<QPixmapDropShadowFilter>
 {
 public:
-    QGLPixmapDropShadowFilter(QGraphicsBlurEffect::BlurHints hints);
+    QGLPixmapDropShadowFilter();
 
     void setUniforms(QGLShaderProgram *program);
 
 protected:
     bool processGL(QPainter *painter, const QPointF &pos, const QPixmap &src, const QRectF &srcRect) const;
-
-private:
-    mutable QSize m_textureSize;
-    mutable bool m_horizontalBlur;
-    mutable bool m_singlePass;
-
-    mutable bool m_haveCached;
-    mutable int m_cachedRadius;
-    mutable QGraphicsBlurEffect::BlurHints m_hints;
 };
 
 extern QGLWidget *qt_gl_share_widget();
@@ -158,31 +137,14 @@ QPixmapFilter *QGL2PaintEngineEx::pixmapFilter(int type, const QPixmapFilter *pr
         return d->colorizeFilter.data();
 
     case QPixmapFilter::BlurFilter: {
-        const QPixmapBlurFilter *proto = static_cast<const QPixmapBlurFilter *>(prototype);
-        if (proto->blurHints() & QGraphicsBlurEffect::AnimationHint) {
-            if (!d->animationBlurFilter)
-                d->animationBlurFilter.reset(new QGLPixmapBlurFilter(proto->blurHints()));
-            return d->animationBlurFilter.data();
-        }
-        if ((proto->blurHints() & QGraphicsBlurEffect::QualityHint) && proto->radius() > 5) {
-            if (!d->blurFilter)
-                d->blurFilter.reset(new QGLPixmapBlurFilter(QGraphicsBlurEffect::QualityHint));
-            return d->blurFilter.data();
-        }
-        if (!d->fastBlurFilter)
-            d->fastBlurFilter.reset(new QGLPixmapBlurFilter(QGraphicsBlurEffect::PerformanceHint));
-        return d->fastBlurFilter.data();
+        if (!d->blurFilter)
+            d->blurFilter.reset(new QGLPixmapBlurFilter());
+        return d->blurFilter.data();
         }
 
     case QPixmapFilter::DropShadowFilter: {
-        const QPixmapDropShadowFilter *proto = static_cast<const QPixmapDropShadowFilter *>(prototype);
-        if (proto->blurRadius() <= 5) {
-            if (!d->fastDropShadowFilter)
-                d->fastDropShadowFilter.reset(new QGLPixmapDropShadowFilter(QGraphicsBlurEffect::PerformanceHint));
-            return d->fastDropShadowFilter.data();
-        }
         if (!d->dropShadowFilter)
-            d->dropShadowFilter.reset(new QGLPixmapDropShadowFilter(QGraphicsBlurEffect::QualityHint));
+            d->dropShadowFilter.reset(new QGLPixmapDropShadowFilter());
         return d->dropShadowFilter.data();
         }
 
@@ -311,59 +273,43 @@ bool QGLPixmapConvolutionFilter::processGL(QPainter *painter, const QPointF &pos
     return true;
 }
 
-static const char *qt_gl_texture_sampling_helper =
-    "lowp float texture2DAlpha(lowp sampler2D src, highp vec2 srcCoords) {\n"
-    "   return texture2D(src, srcCoords).a;\n"
-    "}\n";
-
-QGLPixmapBlurFilter::QGLPixmapBlurFilter(QGraphicsBlurEffect::BlurHints hints)
-    : m_animatedBlur(false)
-    , m_haveCached(false)
-    , m_cachedRadius(0)
-    , m_hints(hints)
-{
-}
-
-// should be even numbers as they will be divided by two
-static const int qCachedBlurLevels[] = { 6, 14, 30 };
-static const int qNumCachedBlurTextures = sizeof(qCachedBlurLevels) / sizeof(*qCachedBlurLevels);
-static const int qMaxCachedBlurLevel = qCachedBlurLevels[qNumCachedBlurTextures - 1];
-
-static qreal qLogBlurLevel(int level)
+QGLPixmapBlurFilter::QGLPixmapBlurFilter()
 {
-    static bool initialized = false;
-    static qreal logBlurLevelCache[qNumCachedBlurTextures];
-    if (!initialized) {
-        for (int i = 0; i < qNumCachedBlurTextures; ++i)
-            logBlurLevelCache[i] = qLn(qCachedBlurLevels[i]);
-        initialized = true;
-    }
-    return logBlurLevelCache[level];
 }
 
 class QGLBlurTextureInfo
 {
 public:
-    QGLBlurTextureInfo(QSize size, GLuint textureIds[])
-        : m_size(size)
+    QGLBlurTextureInfo(const QImage &image, GLuint tex, qreal r)
+        : m_texture(tex)
+        , m_radius(r)
     {
-        for (int i = 0; i < qNumCachedBlurTextures; ++i)
-            m_textureIds[i] = textureIds[i];
+        m_paddedImage << image;
     }
 
     ~QGLBlurTextureInfo()
     {
-        glDeleteTextures(qNumCachedBlurTextures, m_textureIds);
+        glDeleteTextures(1, &m_texture);
     }
 
-    QSize size() const { return m_size; }
-    GLuint textureId(int i) const { return m_textureIds[i]; }
+    QImage paddedImage(int scaleLevel = 0) const;
+    GLuint texture() const { return m_texture; }
+    qreal radius() const { return m_radius; }
 
 private:
-    GLuint m_textureIds[qNumCachedBlurTextures];
-    QSize m_size;
+    mutable QList<QImage> m_paddedImage;
+    GLuint m_texture;
+    qreal m_radius;
 };
 
+QImage QGLBlurTextureInfo::paddedImage(int scaleLevel) const
+{
+    for (int i = m_paddedImage.size() - 1; i <= scaleLevel; ++i)
+        m_paddedImage << qt_halfScaled(m_paddedImage.at(i));
+
+    return m_paddedImage.at(scaleLevel);
+}
+
 class QGLBlurTextureCache : public QObject
 {
 public:
@@ -373,7 +319,6 @@ public:
     ~QGLBlurTextureCache();
 
     QGLBlurTextureInfo *takeBlurTextureInfo(const QPixmap &pixmap);
-    bool fitsInCache(const QPixmap &pixmap) const;
     bool hasBlurTextureInfo(const QPixmap &pixmap) const;
     void insertBlurTextureInfo(const QPixmap &pixmap, QGLBlurTextureInfo *info);
     void clearBlurTextureInfo(const QPixmap &pixmap);
@@ -458,12 +403,7 @@ void QGLBlurTextureCache::insertBlurTextureInfo(const QPixmap &pixmap, QGLBlurTe
     if (timerId)
         killTimer(timerId);
 
-    timerId = startTimer(1000);
-}
-
-bool QGLBlurTextureCache::fitsInCache(const QPixmap &pixmap) const
-{
-    return pixmap.width() * pixmap.height() <= cache.maxCost();
+    timerId = startTimer(8000);
 }
 
 void QGLBlurTextureCache::pixmapDestroyed(QPixmap *pixmap)
@@ -474,567 +414,217 @@ void QGLBlurTextureCache::pixmapDestroyed(QPixmap *pixmap)
     }
 }
 
-static const char *qt_gl_interpolate_filter =
-        "uniform lowp float interpolationValue;"
-        "uniform lowp sampler2D interpolateTarget;"
-        "uniform highp vec4 interpolateMapping;"
-        "lowp vec4 customShader(lowp sampler2D src, highp vec2 srcCoords)"
-        "{"
-        "    return mix(texture2D(interpolateTarget, interpolateMapping.xy + interpolateMapping.zw * srcCoords),"
-        "               texture2D(src, srcCoords), interpolationValue);"
-        "}";
+static const int qAnimatedBlurLevelIncrement = 16;
+static const int qMaxBlurHalfScaleLevel = 1;
 
-static void initializeTexture(GLuint id, int width, int height)
+static GLuint generateBlurTexture(const QSize &size, GLenum format = GL_RGBA)
 {
-    glBindTexture(GL_TEXTURE_2D, id);
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
-                 GL_RGBA, GL_UNSIGNED_BYTE, NULL);
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-    glBindTexture(GL_TEXTURE_2D, 0);
+    GLuint texture;
+    glGenTextures(1, &texture);
+    glBindTexture(GL_TEXTURE_2D, texture);
+    glTexImage2D(GL_TEXTURE_2D, 0, format, size.width(), size.height(), 0, format,
+                 GL_UNSIGNED_BYTE, 0);
+    return texture;
 }
 
-bool QGLPixmapBlurFilter::processGL(QPainter *painter, const QPointF &pos, const QPixmap &src, const QRectF &) const
+static inline uint nextMultiple(uint x, uint multiplier)
 {
-    QGLPixmapBlurFilter *filter = const_cast<QGLPixmapBlurFilter *>(this);
-
-    QGLContext *ctx = const_cast<QGLContext *>(QGLContext::currentContext());
-    QGLBlurTextureCache *blurTextureCache = QGLBlurTextureCache::cacheForContext(ctx);
-
-    if ((m_hints & QGraphicsBlurEffect::AnimationHint) && blurTextureCache->fitsInCache(src)) {
-        QRect targetRect = src.rect().adjusted(-qMaxCachedBlurLevel, -qMaxCachedBlurLevel, qMaxCachedBlurLevel, qMaxCachedBlurLevel);
-        // ensure even dimensions (going to divide by two)
-        targetRect.setWidth((targetRect.width() + 1) & ~1);
-        targetRect.setHeight((targetRect.height() + 1) & ~1);
-
-        QGLBlurTextureInfo *info = 0;
-        if (blurTextureCache->hasBlurTextureInfo(src)) {
-            info = blurTextureCache->takeBlurTextureInfo(src);
-        } else {
-            m_animatedBlur = false;
-            m_hints = QGraphicsBlurEffect::QualityHint;
-            m_singlePass = false;
-
-            QGLFramebufferObjectFormat format;
-            format.setInternalTextureFormat(GLenum(GL_RGBA));
-            QGLFramebufferObject *fbo = qgl_fbo_pool()->acquire(targetRect.size() / 2, format, true);
-
-            if (!fbo)
-                return false;
-
-            QPainter fboPainter(fbo);
-            QGL2PaintEngineEx *engine = static_cast<QGL2PaintEngineEx *>(fboPainter.paintEngine());
-
-            glClearColor(0, 0, 0, 0);
-            glClear(GL_COLOR_BUFFER_BIT);
-
-            // ensure GL_LINEAR filtering is used for scaling down to half the size
-            fboPainter.setRenderHint(QPainter::SmoothPixmapTransform);
-            fboPainter.setCompositionMode(QPainter::CompositionMode_Source);
-            fboPainter.drawPixmap(qMaxCachedBlurLevel / 2, qMaxCachedBlurLevel / 2,
-                    targetRect.width() / 2 - qMaxCachedBlurLevel, targetRect.height() / 2 - qMaxCachedBlurLevel, src);
-
-            GLuint textures[qNumCachedBlurTextures]; // blur textures
-            glGenTextures(qNumCachedBlurTextures, textures);
-            GLuint temp; // temp texture
-            glGenTextures(1, &temp);
-
-            initializeTexture(temp, fbo->width(), fbo->height());
-            m_textureSize = fbo->size();
-
-            int currentBlur = 0;
-
-            QRect fboRect(0, 0, fbo->width(), fbo->height());
-            GLuint sourceTexture = fbo->texture();
-            for (int i = 0; i < qNumCachedBlurTextures; ++i) {
-                int targetBlur = qCachedBlurLevels[i] / 2;
-
-                int blurDelta = qRound(qSqrt(targetBlur * targetBlur - currentBlur * currentBlur));
-                QByteArray source = generateGaussianShader(blurDelta);
-                filter->setSource(source);
-
-                currentBlur = targetBlur;
-
-                // now we're going to be nasty and keep using the same FBO with different textures
-                glFramebufferTexture2D(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
-                        GL_TEXTURE_2D, temp, 0);
-
-                m_horizontalBlur = true;
-                filter->setOnPainter(&fboPainter);
-                engine->drawTexture(fboRect, sourceTexture, fbo->size(), fboRect);
-                filter->removeFromPainter(&fboPainter);
-
-                sourceTexture = textures[i];
-                initializeTexture(sourceTexture, fbo->width(), fbo->height());
-
-                glFramebufferTexture2D(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
-                        GL_TEXTURE_2D, textures[i], 0);
-
-                m_horizontalBlur = false;
-                filter->setOnPainter(&fboPainter);
-                engine->drawTexture(fboRect, temp, fbo->size(), fboRect);
-                filter->removeFromPainter(&fboPainter);
-            }
-
-            glDeleteTextures(1, &temp);
+    uint mod = x % multiplier;
+    if (mod == 0)
+        return x;
+    return x + multiplier - mod;
+}
 
-            // reattach the original FBO texture
-            glFramebufferTexture2D(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
-                    GL_TEXTURE_2D, fbo->texture(), 0);
+void qt_memrotate90_gl(const quint32 *src, int srcWidth, int srcHeight, int srcStride,
+                       quint32 *dest, int dstStride);
 
-            fboPainter.end();
+bool QGLPixmapBlurFilter::processGL(QPainter *painter, const QPointF &pos, const QPixmap &src, const QRectF &) const
+{
+    if (radius() < 1) {
+        painter->drawPixmap(pos, src);
+        return true;
+    }
 
-            qgl_fbo_pool()->release(fbo);
+    qreal actualRadius = radius();
 
-            info = new QGLBlurTextureInfo(fboRect.size(), textures);
-        }
+    QGLContext *ctx = const_cast<QGLContext *>(QGLContext::currentContext());
 
-        if (!m_haveCached || !m_animatedBlur) {
-            m_haveCached = true;
-            m_animatedBlur = true;
-            m_hints = QGraphicsBlurEffect::AnimationHint;
-            filter->setSource(qt_gl_interpolate_filter);
-        }
+    QGLBlurTextureCache *blurTextureCache = QGLBlurTextureCache::cacheForContext(ctx);
+    QGLBlurTextureInfo *info = 0;
+    int padding = nextMultiple(qCeil(actualRadius), qAnimatedBlurLevelIncrement);
+    QRect targetRect = src.rect().adjusted(-padding, -padding, padding, padding);
 
-        QGL2PaintEngineEx *engine = static_cast<QGL2PaintEngineEx *>(painter->paintEngine());
-        painter->setRenderHint(QPainter::SmoothPixmapTransform);
-        filter->setOnPainter(painter);
+    // pad so that we'll be able to half-scale qMaxBlurHalfScaleLevel times
+    targetRect.setWidth((targetRect.width() + (qMaxBlurHalfScaleLevel-1)) & ~(qMaxBlurHalfScaleLevel-1));
+    targetRect.setHeight((targetRect.height() + (qMaxBlurHalfScaleLevel-1)) & ~(qMaxBlurHalfScaleLevel-1));
 
-        qreal logRadius = qLn(radius());
+    QSize textureSize;
 
-        int t;
-        for (t = -1; t < qNumCachedBlurTextures - 2; ++t) {
-            if (logRadius < qLogBlurLevel(t+1))
-                break;
-        }
+    info = blurTextureCache->takeBlurTextureInfo(src);
+    if (!info || info->radius() < actualRadius) {
+        QSize paddedSize = targetRect.size() / 2;
 
-        qreal logBase = t >= 0 ? qLogBlurLevel(t) : 0;
-        m_t = qBound(qreal(0), (logRadius - logBase) / (qLogBlurLevel(t+1) - logBase), qreal(1));
+        QImage padded(paddedSize.height(), paddedSize.width(), QImage::Format_ARGB32_Premultiplied);
+        padded.fill(0);
 
-        m_textureSize = info->size();
+        if (info) {
+            int oldPadding = qRound(info->radius());
 
-        glActiveTexture(GL_TEXTURE0 + 3);
-        if (t >= 0) {
-            glBindTexture(GL_TEXTURE_2D, info->textureId(t));
-            m_targetSize = info->size();
+            QPainter p(&padded);
+            p.setCompositionMode(QPainter::CompositionMode_Source);
+            p.drawImage((padding - oldPadding) / 2, (padding - oldPadding) / 2, info->paddedImage());
+            p.end();
         } else {
-            QGLTexture *texture =
-                ctx->d_func()->bindTexture(src, GL_TEXTURE_2D, GL_RGBA,
-                                           QGLContext::InternalBindOption
-                                           | QGLContext::CanFlipNativePixmapBindOption);
-            m_targetSize = src.size();
-            if (!(texture->options & QGLContext::InvertedYBindOption))
-                m_targetSize.setHeight(-m_targetSize.height());
+            // TODO: combine byteswapping and memrotating into one by declaring
+            // custom GL_RGBA pixel type and qt_colorConvert template for it
+            QImage prepadded = qt_halfScaled(src.toImage()).convertToFormat(QImage::Format_ARGB32_Premultiplied);
+
+            // byte-swap and memrotates in one go
+            qt_memrotate90_gl(reinterpret_cast<const quint32*>(prepadded.bits()),
+                              prepadded.width(), prepadded.height(), prepadded.bytesPerLine(),
+                              reinterpret_cast<quint32*>(padded.scanLine(padding / 2)) + padding / 2,
+                              padded.bytesPerLine());
         }
 
-        // restrict the target rect to the max of the radii we are interpolating between
-        int radiusDelta = qMaxCachedBlurLevel - qCachedBlurLevels[t+1];
-        targetRect = targetRect.translated(pos.toPoint()).adjusted(radiusDelta, radiusDelta, -radiusDelta, -radiusDelta);
-
-        radiusDelta /= 2;
-        QRect sourceRect = QRect(QPoint(), m_textureSize).adjusted(radiusDelta, radiusDelta, -radiusDelta, -radiusDelta);
-
-        engine->drawTexture(targetRect, info->textureId(t+1), m_textureSize, sourceRect);
-
-        glActiveTexture(GL_TEXTURE0 + 3);
-        glBindTexture(GL_TEXTURE_2D, 0);
-
-        filter->removeFromPainter(painter);
-        blurTextureCache->insertBlurTextureInfo(src, info);
-
-        return true;
-    }
+        delete info;
+        info = new QGLBlurTextureInfo(padded, generateBlurTexture(paddedSize), padding);
 
-    if (blurTextureCache->hasBlurTextureInfo(src))
-        blurTextureCache->clearBlurTextureInfo(src);
-
-    int actualRadius = qRound(radius());
-    int filterRadius = actualRadius;
-    int fastRadii[] = { 1, 2, 3, 5, 8, 15, 25 };
-    if (!(m_hints & QGraphicsBlurEffect::QualityHint)) {
-        uint i = 0;
-        for (; i < (sizeof(fastRadii)/sizeof(*fastRadii))-1; ++i) {
-            if (fastRadii[i+1] > filterRadius)
-                break;
-        }
-        filterRadius = fastRadii[i];
+        textureSize = paddedSize;
+    } else {
+        textureSize = QSize(info->paddedImage().height(), info->paddedImage().width());
     }
 
-    m_singlePass = filterRadius <= 3;
-
-    if (!m_haveCached || m_animatedBlur || filterRadius != m_cachedRadius) {
-        // Only regenerate the shader from source if parameters have changed.
-        m_haveCached = true;
-        m_animatedBlur = false;
-        m_cachedRadius = filterRadius;
-        QByteArray source = generateGaussianShader(filterRadius, m_singlePass);
-        filter->setSource(source);
+    actualRadius *= qreal(0.5);
+    int level = 1;
+    for (; level < qMaxBlurHalfScaleLevel; ++level) {
+        if (actualRadius <= 16)
+            break;
+        actualRadius *= qreal(0.5);
     }
 
-    QRect targetRect = QRectF(src.rect()).translated(pos).adjusted(-actualRadius, -actualRadius, actualRadius, actualRadius).toAlignedRect();
+    const int s = (1 << level);
 
-    if (m_singlePass) {
-        // prepare for updateUniforms
-        m_textureSize = src.size();
+    int prepadding = qRound(info->radius());
+    padding = qMin(prepadding, qCeil(actualRadius) << level);
+    targetRect = src.rect().adjusted(-padding, -padding, padding, padding);
 
-        // ensure GL_LINEAR filtering is used
-        painter->setRenderHint(QPainter::SmoothPixmapTransform);
-        filter->setOnPainter(painter);
-        QBrush pixmapBrush = src;
-        pixmapBrush.setTransform(QTransform::fromTranslate(pos.x(), pos.y()));
-        painter->fillRect(targetRect, pixmapBrush);
-        filter->removeFromPainter(painter);
-    } else {
-        QGLFramebufferObjectFormat format;
-        format.setInternalTextureFormat(GLenum(src.hasAlphaChannel() ? GL_RGBA : GL_RGB));
-        QGLFramebufferObject *fbo = qgl_fbo_pool()->acquire(targetRect.size(), format);
+    targetRect.setWidth(targetRect.width() & ~(s-1));
+    targetRect.setHeight(targetRect.height() & ~(s-1));
 
-        if (!fbo)
-            return false;
+    int paddingDelta = (prepadding - padding) >> level;
 
-        // prepare for updateUniforms
-        m_textureSize = src.size();
+    QRect subRect(paddingDelta, paddingDelta, targetRect.width() >> level, targetRect.height() >> level);
+    QImage sourceImage = info->paddedImage(level-1);
 
-        // horizontal pass, to pixmap
-        m_horizontalBlur = true;
+    QImage subImage(subRect.height(), subRect.width(), QImage::Format_ARGB32_Premultiplied);
+    qt_rectcopy((QRgb *)subImage.bits(), ((QRgb *)sourceImage.scanLine(paddingDelta)) + paddingDelta,
+                0, 0, subRect.height(), subRect.width(), subImage.bytesPerLine(), sourceImage.bytesPerLine());
 
-        QPainter fboPainter(fbo);
+    GLuint texture = info->texture();
 
-        glClearColor(0, 0, 0, 0);
-        glClear(GL_COLOR_BUFFER_BIT);
+    qt_blurImage(subImage, actualRadius, blurHints() & QGraphicsBlurEffect::QualityHint, 1);
 
-        // ensure GL_LINEAR filtering is used
-        fboPainter.setRenderHint(QPainter::SmoothPixmapTransform);
-        fboPainter.setCompositionMode(QPainter::CompositionMode_Source);
-        filter->setOnPainter(&fboPainter);
-        QBrush pixmapBrush = src;
-        pixmapBrush.setTransform(QTransform::fromTranslate(actualRadius, actualRadius));
-        fboPainter.fillRect(QRect(0, 0, targetRect.width(), targetRect.height()), pixmapBrush);
-        filter->removeFromPainter(&fboPainter);
-        fboPainter.end();
+    // subtract one pixel off the end to prevent the bilinear sampling from sampling uninitialized data
+    QRect textureSubRect = subImage.rect().adjusted(0, 0, -1, -1);
+    QRectF targetRectF = QRectF(targetRect).adjusted(0, 0, -targetRect.width() / qreal(textureSize.width()), -targetRect.height() / qreal(textureSize.height()));
 
-        QGL2PaintEngineEx *engine = static_cast<QGL2PaintEngineEx *>(painter->paintEngine());
+    glBindTexture(GL_TEXTURE_2D, texture);
+    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, subImage.width(), subImage.height(), GL_RGBA,
+            GL_UNSIGNED_BYTE, const_cast<const QImage &>(subImage).bits());
 
-        // vertical pass, to painter
-        m_horizontalBlur = false;
-        m_textureSize = fbo->size();
+    QGL2PaintEngineEx *engine = static_cast<QGL2PaintEngineEx *>(painter->paintEngine());
+    painter->setRenderHint(QPainter::SmoothPixmapTransform);
 
-        painter->save();
-        // ensure GL_LINEAR filtering is used
-        painter->setRenderHint(QPainter::SmoothPixmapTransform);
-        filter->setOnPainter(painter);
-        engine->drawTexture(targetRect, fbo->texture(), fbo->size(), QRect(QPoint(), targetRect.size()).translated(0, fbo->height() - targetRect.height()));
-        filter->removeFromPainter(painter);
-        painter->restore();
+    // texture is flipped on the y-axis
+    targetRectF = QRectF(targetRectF.x(), targetRectF.bottom(), targetRectF.width(), -targetRectF.height());
+    engine->drawTexture(targetRectF.translated(pos), texture, textureSize, textureSubRect);
 
-        qgl_fbo_pool()->release(fbo);
-    }
+    blurTextureCache->insertBlurTextureInfo(src, info);
 
     return true;
 }
 
-void QGLPixmapBlurFilter::setUniforms(QGLShaderProgram *program)
-{
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-
-    if (m_animatedBlur) {
-        program->setUniformValue("interpolateTarget", 3);
-        program->setUniformValue("interpolationValue", GLfloat(m_t));
-
-        if (m_textureSize == m_targetSize) {
-            program->setUniformValue("interpolateMapping", 0.0f, 0.0f, 1.0f, 1.0f);
-        } else {
-            float offsetX = (-qMaxCachedBlurLevel - 0.5) / qreal(m_targetSize.width());
-            float offsetY = (-qMaxCachedBlurLevel - 0.5) / qreal(m_targetSize.height());
-
-            if (m_targetSize.height() < 0)
-                offsetY = 1 + offsetY;
-
-            float scaleX = 2.0f * qreal(m_textureSize.width()) / qreal(m_targetSize.width());
-            float scaleY = 2.0f * qreal(m_textureSize.height()) / qreal(m_targetSize.height());
-
-            program->setUniformValue("interpolateMapping", offsetX, offsetY, scaleX, scaleY);
-        }
-
-        return;
-    }
+static const char *qt_gl_drop_shadow_filter =
+        "uniform lowp vec4 shadowColor;"
+        "lowp vec4 customShader(lowp sampler2D src, highp vec2 srcCoords)"
+        "{"
+        "    return shadowColor * texture2D(src, srcCoords.yx).a;"
+        "}";
 
-    if (m_hints & QGraphicsBlurEffect::QualityHint) {
-        if (m_singlePass)
-            program->setUniformValue("delta", 1.0 / m_textureSize.width(), 1.0 / m_textureSize.height());
-        else if (m_horizontalBlur)
-            program->setUniformValue("delta", 1.0 / m_textureSize.width(), 0.0);
-        else
-            program->setUniformValue("delta", 0.0, 1.0 / m_textureSize.height());
-    } else {
-        qreal blur = radius() / qreal(m_cachedRadius);
-
-        if (m_singlePass)
-            program->setUniformValue("delta", blur / m_textureSize.width(), blur / m_textureSize.height());
-        else if (m_horizontalBlur)
-            program->setUniformValue("delta", blur / m_textureSize.width(), 0.0);
-        else
-            program->setUniformValue("delta", 0.0, blur / m_textureSize.height());
-    }
-}
 
-static inline qreal gaussian(qreal dx, qreal sigma)
+QGLPixmapDropShadowFilter::QGLPixmapDropShadowFilter()
 {
-    return exp(-dx * dx / (2 * sigma * sigma)) / (Q_2PI * sigma * sigma);
+    setSource(qt_gl_drop_shadow_filter);
 }
 
-QByteArray QGLPixmapBlurFilter::generateGaussianShader(int radius, bool singlePass, bool dropShadow)
+bool QGLPixmapDropShadowFilter::processGL(QPainter *painter, const QPointF &pos, const QPixmap &src, const QRectF &srcRect) const
 {
-    Q_ASSERT(radius >= 1);
-
-    radius = qMin(127, radius);
-
-    static QCache<uint, QByteArray> shaderSourceCache;
-    uint key = radius | (int(singlePass) << 7) | (int(dropShadow) << 8);
-    QByteArray *cached = shaderSourceCache.object(key);
-    if (cached)
-        return *cached;
-
-    QByteArray source;
-    source.reserve(1000);
-    source.append(qt_gl_texture_sampling_helper);
-
-    source.append("uniform highp vec2      delta;\n");
-    if (dropShadow)
-        source.append("uniform mediump vec4    shadowColor;\n");
-    source.append("lowp vec4 customShader(lowp sampler2D src, highp vec2 srcCoords) {\n");
-
-    QVector<qreal> sampleOffsets;
-    QVector<qreal> weights;
-
-    QVector<qreal> gaussianComponents;
-
-    qreal sigma = radius / 1.65;
-
-    qreal sum = 0;
-    for (int i = -radius; i < radius; ++i) {
-        float value = gaussian(i, sigma);
-        gaussianComponents << value;
-        sum += value;
-    }
-
-    // normalize
-    for (int i = 0; i < gaussianComponents.size(); ++i)
-        gaussianComponents[i] /= sum;
-
-    for (int i = 0; i < gaussianComponents.size() - 1; i += 2) {
-        qreal weight = gaussianComponents.at(i) + gaussianComponents.at(i + 1);
-        qreal offset = i - radius + gaussianComponents.at(i + 1) / weight;
-
-        sampleOffsets << offset;
-        weights << weight;
-    }
-
-    int limit = sampleOffsets.size();
-    if (singlePass)
-        limit *= limit;
-
-    QByteArray baseCoordinate = "srcCoords";
-
-    for (int i = 0; i < limit; ++i) {
-        QByteArray coordinate = baseCoordinate;
-
-        qreal weight;
-        if (singlePass) {
-            const int xIndex = i % sampleOffsets.size();
-            const int yIndex = i / sampleOffsets.size();
-
-            const qreal deltaX = sampleOffsets.at(xIndex);
-            const qreal deltaY = sampleOffsets.at(yIndex);
-            weight = weights.at(xIndex) * weights.at(yIndex);
-
-            if (!qFuzzyCompare(deltaX, deltaY)) {
-                coordinate.append(" + vec2(delta.x * float(");
-                coordinate.append(QByteArray::number(deltaX));
-                coordinate.append("), delta.y * float(");
-                coordinate.append(QByteArray::number(deltaY));
-                coordinate.append("))");
-            } else if (!qFuzzyIsNull(deltaX)) {
-                coordinate.append(" + delta * float(");
-                coordinate.append(QByteArray::number(deltaX));
-                coordinate.append(")");
-            }
-        } else {
-            const qreal delta = sampleOffsets.at(i);
-            weight = weights.at(i);
-            if (!qFuzzyIsNull(delta)) {
-                coordinate.append(" + delta * float(");
-                coordinate.append(QByteArray::number(delta));
-                coordinate.append(")");
-            }
-        }
-
-        if (i == 0) {
-            if (dropShadow)
-                source.append("    mediump float sample = ");
-            else
-                source.append("    mediump vec4 sample = ");
-        } else {
-            if (dropShadow)
-                source.append("    sample += ");
-            else
-                source.append("    sample += ");
-        }
+    QGLPixmapDropShadowFilter *filter = const_cast<QGLPixmapDropShadowFilter *>(this);
 
-        source.append("texture2D(src, ");
-        source.append(coordinate);
-        source.append(")");
+    qreal r = blurRadius();
+    QRectF targetRectUnaligned = QRectF(src.rect()).translated(pos + offset()).adjusted(-r, -r, r, r);
+    QRect targetRect = targetRectUnaligned.toAlignedRect();
 
-        if (dropShadow)
-            source.append(".a");
+    // ensure even dimensions (going to divide by two)
+    targetRect.setWidth((targetRect.width() + 1) & ~1);
+    targetRect.setHeight((targetRect.height() + 1) & ~1);
 
-        if (!qFuzzyCompare(weight, qreal(1))) {
-            source.append(" * float(");
-            source.append(QByteArray::number(weight));
-            source.append(");\n");
-        } else {
-            source.append(";\n");
-        }
-    }
+    QGLContext *ctx = const_cast<QGLContext *>(QGLContext::currentContext());
+    QGLBlurTextureCache *blurTextureCache = QGLBlurTextureCache::cacheForContext(ctx);
 
-    source.append("    return ");
-    if (dropShadow)
-        source.append("shadowColor * ");
-    source.append("sample;\n");
-    source.append("}\n");
+    QGLBlurTextureInfo *info = blurTextureCache->takeBlurTextureInfo(src);
+    if (!info || info->radius() != r) {
+        QImage half = qt_halfScaled(src.toImage().alphaChannel());
 
-    cached = new QByteArray(source);
-    shaderSourceCache.insert(key, cached);
+        qreal rx = r + targetRect.left() - targetRectUnaligned.left();
+        qreal ry = r + targetRect.top() - targetRectUnaligned.top();
 
-    return source;
-}
+        QImage image = QImage(targetRect.size() / 2, QImage::Format_Indexed8);
+        image.setColorTable(half.colorTable());
+        image.fill(0);
+        int dx = qRound(rx * qreal(0.5));
+        int dy = qRound(ry * qreal(0.5));
+        qt_rectcopy(image.bits(), half.bits(), dx, dy,
+                    half.width(), half.height(),
+                    image.bytesPerLine(), half.bytesPerLine());
 
-QGLPixmapDropShadowFilter::QGLPixmapDropShadowFilter(QGraphicsBlurEffect::BlurHints hints)
-    : m_haveCached(false)
-    , m_cachedRadius(0)
-    , m_hints(hints)
-{
-}
+        qt_blurImage(image, r * qreal(0.5), false, 1);
 
-bool QGLPixmapDropShadowFilter::processGL(QPainter *painter, const QPointF &pos, const QPixmap &src, const QRectF &srcRect) const
-{
-    QGLPixmapDropShadowFilter *filter = const_cast<QGLPixmapDropShadowFilter *>(this);
+        GLuint texture = generateBlurTexture(image.size(), GL_ALPHA);
 
-    int actualRadius = qRound(blurRadius());
-    int filterRadius = actualRadius;
-    m_singlePass = filterRadius <= 3;
+        glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, image.width(), image.height(), GL_ALPHA,
+                        GL_UNSIGNED_BYTE, image.bits());
 
-    if (!m_haveCached || filterRadius != m_cachedRadius) {
-        // Only regenerate the shader from source if parameters have changed.
-        m_haveCached = true;
-        m_cachedRadius = filterRadius;
-        QByteArray source = QGLPixmapBlurFilter::generateGaussianShader(filterRadius, m_singlePass, true);
-        filter->setSource(source);
+        info = new QGLBlurTextureInfo(image, texture, r);
     }
 
-    QRect targetRect = QRectF(src.rect()).translated(pos + offset()).adjusted(-actualRadius, -actualRadius, actualRadius, actualRadius).toAlignedRect();
-
-    if (m_singlePass) {
-        // prepare for updateUniforms
-        m_textureSize = src.size();
-
-        painter->save();
-        // ensure GL_LINEAR filtering is used
-        painter->setRenderHint(QPainter::SmoothPixmapTransform);
-        filter->setOnPainter(painter);
-        QBrush pixmapBrush = src;
-        pixmapBrush.setTransform(QTransform::fromTranslate(pos.x() + offset().x(), pos.y() + offset().y()));
-        painter->fillRect(targetRect, pixmapBrush);
-        filter->removeFromPainter(painter);
-        painter->restore();
-    } else {
-        QGLFramebufferObjectFormat format;
-        format.setInternalTextureFormat(GLenum(src.hasAlphaChannel() ? GL_RGBA : GL_RGB));
-        QGLFramebufferObject *fbo = qgl_fbo_pool()->acquire(targetRect.size(), format);
-
-        if (!fbo)
-            return false;
-
-        // prepare for updateUniforms
-        m_textureSize = src.size();
-
-        // horizontal pass, to pixmap
-        m_horizontalBlur = true;
-
-        QPainter fboPainter(fbo);
+    GLuint texture = info->texture();
 
-        glClearColor(0, 0, 0, 0);
-        glClear(GL_COLOR_BUFFER_BIT);
-
-        // ensure GL_LINEAR filtering is used
-        fboPainter.setRenderHint(QPainter::SmoothPixmapTransform);
-        fboPainter.setCompositionMode(QPainter::CompositionMode_Source);
-        filter->setOnPainter(&fboPainter);
-        QBrush pixmapBrush = src;
-        pixmapBrush.setTransform(QTransform::fromTranslate(actualRadius, actualRadius));
-        fboPainter.fillRect(QRect(0, 0, targetRect.width(), targetRect.height()), pixmapBrush);
-        filter->removeFromPainter(&fboPainter);
-        fboPainter.end();
-
-        QGL2PaintEngineEx *engine = static_cast<QGL2PaintEngineEx *>(painter->paintEngine());
+    filter->setOnPainter(painter);
 
-        // vertical pass, to painter
-        m_horizontalBlur = false;
-        m_textureSize = fbo->size();
+    QGL2PaintEngineEx *engine = static_cast<QGL2PaintEngineEx *>(painter->paintEngine());
+    painter->setRenderHint(QPainter::SmoothPixmapTransform);
 
-        painter->save();
-        // ensure GL_LINEAR filtering is used
-        painter->setRenderHint(QPainter::SmoothPixmapTransform);
-        filter->setOnPainter(painter);
-        engine->drawTexture(targetRect, fbo->texture(), fbo->size(), QRectF(0, fbo->height() - targetRect.height(), targetRect.width(), targetRect.height()));
-        filter->removeFromPainter(painter);
-        painter->restore();
+    engine->drawTexture(targetRect, texture, info->paddedImage().size(), info->paddedImage().rect());
 
-        qgl_fbo_pool()->release(fbo);
-    }
+    filter->removeFromPainter(painter);
 
     // Now draw the actual pixmap over the top.
     painter->drawPixmap(pos, src, srcRect);
 
+    blurTextureCache->insertBlurTextureInfo(src, info);
+
     return true;
 }
 
 void QGLPixmapDropShadowFilter::setUniforms(QGLShaderProgram *program)
 {
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-
     QColor col = color();
-    if (m_horizontalBlur && !m_singlePass) {
-        program->setUniformValue("shadowColor", 1.0f, 1.0f, 1.0f, 1.0f);
-    } else {
-        qreal alpha = col.alphaF();
-        program->setUniformValue("shadowColor", col.redF() * alpha,
-                                                col.greenF() * alpha,
-                                                col.blueF() * alpha,
-                                                alpha);
-    }
-
-    if (m_hints & QGraphicsBlurEffect::QualityHint) {
-        if (m_singlePass)
-            program->setUniformValue("delta", 1.0 / m_textureSize.width(), 1.0 / m_textureSize.height());
-        else if (m_horizontalBlur)
-            program->setUniformValue("delta", 1.0 / m_textureSize.width(), 0.0);
-        else
-            program->setUniformValue("delta", 0.0, 1.0 / m_textureSize.height());
-    } else {
-        qreal blur = blurRadius() / qreal(m_cachedRadius);
-
-        if (m_singlePass)
-            program->setUniformValue("delta", blur / m_textureSize.width(), blur / m_textureSize.height());
-        else if (m_horizontalBlur)
-            program->setUniformValue("delta", blur / m_textureSize.width(), 0.0);
-        else
-            program->setUniformValue("delta", 0.0, blur / m_textureSize.height());
-    }
+    qreal alpha = col.alphaF();
+    program->setUniformValue("shadowColor", col.redF() * alpha,
+                                            col.greenF() * alpha,
+                                            col.blueF() * alpha,
+                                            alpha);
 }
 
 QT_END_NAMESPACE
diff --git a/src/opengl/qpaintengine_opengl.cpp b/src/opengl/qpaintengine_opengl.cpp
index ed7fdff..8dae02a 100644
--- a/src/opengl/qpaintengine_opengl.cpp
+++ b/src/opengl/qpaintengine_opengl.cpp
@@ -4522,6 +4522,12 @@ typedef QHash<QFontEngine*, QGLGlyphHash*> QGLFontGlyphHash;
 typedef QHash<quint64, QGLFontTexture*> QGLFontTexHash;
 typedef QHash<const QGLContext*, QGLFontGlyphHash*> QGLContextHash;
 
+static inline void qt_delete_glyph_hash(QGLGlyphHash *hash)
+{
+    qDeleteAll(*hash);
+    delete hash;
+}
+
 class QGLGlyphCache : public QObject
 {
     Q_OBJECT
@@ -4562,7 +4568,7 @@ void QGLGlyphCache::fontEngineDestroyed(QObject *o)
         if (font_cache->find(fe) != font_cache->end()) {
             ctx = keys.at(i);
             QGLGlyphHash *cache = font_cache->take(fe);
-            delete cache;
+            qt_delete_glyph_hash(cache);
             break;
         }
     }
@@ -4599,7 +4605,7 @@ void QGLGlyphCache::cleanupContext(const QGLContext *ctx)
         QList<QFontEngine *> keys = font_cache->keys();
         for (int i=0; i < keys.size(); ++i) {
             QFontEngine *fe = keys.at(i);
-            delete font_cache->take(fe);
+            qt_delete_glyph_hash(font_cache->take(fe));
             quint64 font_key = (reinterpret_cast<quint64>(ctx) << 32) | reinterpret_cast<quint64>(fe);
             QGLFontTexture *font_tex = qt_font_textures.take(font_key);
             if (font_tex) {
@@ -4640,7 +4646,9 @@ void QGLGlyphCache::cleanCache()
     QList<const QGLContext *> keys = qt_context_cache.keys();
     for (int i=0; i < keys.size(); ++i) {
         QGLFontGlyphHash *font_cache = qt_context_cache.value(keys.at(i));
-        qDeleteAll(*font_cache);
+        QGLFontGlyphHash::Iterator it = font_cache->begin();
+        for (; it != font_cache->end(); ++it)
+            qt_delete_glyph_hash(it.value());
         font_cache->clear();
     }
     qDeleteAll(qt_context_cache);
diff --git a/src/opengl/qpixmapdata_gl.cpp b/src/opengl/qpixmapdata_gl.cpp
index 4e1d50d..92c990b 100644
--- a/src/opengl/qpixmapdata_gl.cpp
+++ b/src/opengl/qpixmapdata_gl.cpp
@@ -341,22 +341,11 @@ void QGLPixmapData::ensureCreated() const
 
     if (!m_source.isNull()) {
         if (external_format == GL_RGB) {
-            QImage tx = m_source.convertToFormat(QImage::Format_RGB32);
-
-            QVector<uchar> pixelData(w * h * 3);
-            uchar *p = &pixelData[0];
-            QRgb *src = (QRgb *)tx.bits();
-
-            for (int i = 0; i < w * h; ++i) {
-                *p++ = qRed(*src);
-                *p++ = qGreen(*src);
-                *p++ = qBlue(*src);
-                ++src;
-            }
+            const QImage tx = m_source.convertToFormat(QImage::Format_RGB888);
 
             glBindTexture(target, m_texture.id);
             glTexSubImage2D(target, 0, 0, 0, w, h, external_format,
-                            GL_UNSIGNED_BYTE, &pixelData[0]);
+                            GL_UNSIGNED_BYTE, tx.bits());
         } else {
             const QImage tx = ctx->d_func()->convertToGLFormat(m_source, true, external_format);