Merge branch 'master' of git@scm.dev.nokia.troll.no:qt/qt into master-s60

Conflicts:
	src/gui/graphicsview/qgraphicsitem.cpp
	src/gui/kernel/qwidget.cpp
	src/gui/kernel/qwidget_p.h

13 files changed, 1211 insertions, 115 deletions

diff --git a/src/opengl/gl2paintengineex/qglcustomshaderstage.cpp b/src/opengl/gl2paintengineex/qglcustomshaderstage.cpp
new file mode 100644
index 0000000..a82caa0
--- /dev/null
+++ b/src/opengl/gl2paintengineex/qglcustomshaderstage.cpp
@@ -0,0 +1,123 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://www.qtsoftware.com/contact.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qglcustomshaderstage_p.h"
+#include "qglengineshadermanager_p.h"
+#include "qpaintengineex_opengl2_p.h"
+#include <private/qpainter_p.h>
+
+class QGLCustomShaderStagePrivate
+{
+public:
+    QGLCustomShaderStagePrivate() :
+        m_manager(0) {}
+
+    QGLEngineShaderManager* m_manager;
+    QByteArray              m_source;
+};
+
+
+
+
+QGLCustomShaderStage::QGLCustomShaderStage()
+    : d_ptr(new QGLCustomShaderStagePrivate)
+{
+}
+
+QGLCustomShaderStage::~QGLCustomShaderStage()
+{
+    Q_D(QGLCustomShaderStage);
+    if (d->m_manager)
+        d->m_manager->removeCustomStage(this);
+}
+
+void QGLCustomShaderStage::setUniformsDirty()
+{
+    Q_D(QGLCustomShaderStage);
+    if (d->m_manager)
+        d->m_manager->setDirty(); // ### Probably a bit overkill!
+}
+
+bool QGLCustomShaderStage::setOnPainter(QPainter* p)
+{
+    Q_D(QGLCustomShaderStage);
+    if (p->paintEngine()->type() != QPaintEngine::OpenGL2) {
+        qWarning("QGLCustomShaderStage::setOnPainter() - paint engine not OpenGL2");
+        return false;
+    }
+
+    // Might as well go through the paint engine to get to the context
+    const QGLContext* ctx = static_cast<QGL2PaintEngineEx*>(p->paintEngine())->context();
+    d->m_manager = QGLEngineShaderManager::managerForContext(ctx);
+    Q_ASSERT(d->m_manager);
+
+    d->m_manager->setCustomStage(this);
+    return true;
+}
+
+void QGLCustomShaderStage::removeFromPainter(QPainter* p)
+{
+    Q_D(QGLCustomShaderStage);
+    if (p->paintEngine()->type() != QPaintEngine::OpenGL2)
+        return;
+
+    // Might as well go through the paint engine to get to the context
+    const QGLContext* ctx = static_cast<QGL2PaintEngineEx*>(p->paintEngine())->context();
+    d->m_manager = QGLEngineShaderManager::managerForContext(ctx);
+    Q_ASSERT(d->m_manager);
+
+    // Just set the stage to null, don't call removeCustomStage().
+    // This should leave the program in a compiled/linked state
+    // if the next custom shader stage is this one again.
+    d->m_manager->setCustomStage(0);
+}
+
+const char* QGLCustomShaderStage::source() const
+{
+    Q_D(const QGLCustomShaderStage);
+    return d->m_source.constData();
+}
+
+void QGLCustomShaderStage::setSource(const QByteArray& s)
+{
+    Q_D(QGLCustomShaderStage);
+    d->m_source = s;
+}
diff --git a/src/opengl/gl2paintengineex/qglcustomshaderstage_p.h b/src/opengl/gl2paintengineex/qglcustomshaderstage_p.h
new file mode 100644
index 0000000..70e9ff0
--- /dev/null
+++ b/src/opengl/gl2paintengineex/qglcustomshaderstage_p.h
@@ -0,0 +1,92 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://www.qtsoftware.com/contact.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#ifndef QGL_CUSTOM_SHADER_STAGE_H
+#define QGL_CUSTOM_SHADER_STAGE_H
+
+#include <QGLShaderProgram>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(OpenGL)
+
+class QGLCustomShaderStagePrivate;
+class Q_OPENGL_EXPORT QGLCustomShaderStage
+{
+    Q_DECLARE_PRIVATE(QGLCustomShaderStage);
+public:
+    QGLCustomShaderStage();
+    virtual ~QGLCustomShaderStage();
+    virtual void setUniforms(QGLShaderProgram*) = 0;
+
+    void setUniformsDirty();
+
+    bool setOnPainter(QPainter*);
+    void removeFromPainter(QPainter*);
+    const char* source() const;
+
+protected:
+    void setSource(const QByteArray&);
+
+private:
+    QGLCustomShaderStagePrivate* d_ptr;
+};
+
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+
+#endif
diff --git a/src/opengl/gl2paintengineex/qglengineshadermanager.cpp b/src/opengl/gl2paintengineex/qglengineshadermanager.cpp
index 42b36a2..795c8b0 100644
--- a/src/opengl/gl2paintengineex/qglengineshadermanager.cpp
+++ b/src/opengl/gl2paintengineex/qglengineshadermanager.cpp
@@ -86,6 +86,7 @@ QGLEngineShaderManager::QGLEngineShaderManager(QGLContext* context)
       maskType(NoMask),
       useTextureCoords(false),
       compositionMode(QPainter::CompositionMode_SourceOver),
+      customSrcStage(0),
       blitShaderProg(0),
       simpleShaderProg(0),
       currentShaderProg(0)
@@ -131,6 +132,7 @@ QGLEngineShaderManager::QGLEngineShaderManager(QGLContext* context)
         code[ImageSrcFragmentShader] = qglslImageSrcFragmentShader;
         code[ImageSrcWithPatternFragmentShader] = qglslImageSrcWithPatternFragmentShader;
         code[NonPremultipliedImageSrcFragmentShader] = qglslNonPremultipliedImageSrcFragmentShader;
+        code[CustomImageSrcFragmentShader] = ""; // Supplied by app.
         code[SolidBrushSrcFragmentShader] = qglslSolidBrushSrcFragmentShader;
         code[TextureBrushSrcFragmentShader] = qglslTextureBrushSrcFragmentShader;
         code[TextureBrushSrcWithPatternFragmentShader] = qglslTextureBrushSrcWithPatternFragmentShader;
@@ -159,7 +161,7 @@ QGLEngineShaderManager::QGLEngineShaderManager(QGLContext* context)
 #if defined(QT_DEBUG)
         // Check that all the elements have been filled:
         for (int i = 0; i < TotalShaderCount; ++i) {
-            if (qglEngineShaderSourceCode[i] == 0) {
+            if (i != CustomImageSrcFragmentShader && qglEngineShaderSourceCode[i] == 0) {
                 int enumIndex = staticMetaObject.indexOfEnumerator("ShaderName");
                 QMetaEnum m = staticMetaObject.enumerator(enumIndex);
 
@@ -308,6 +310,44 @@ void QGLEngineShaderManager::setCompositionMode(QPainter::CompositionMode mode)
     shaderProgNeedsChanging = true; //###
 }
 
+void QGLEngineShaderManager::setCustomStage(QGLCustomShaderStage* stage)
+{
+    // If the custom shader has changed, then destroy the previous compilation.
+    if (customSrcStage && stage && customSrcStage != stage)
+        removeCustomStage(customSrcStage);
+
+    customSrcStage = stage;
+    shaderProgNeedsChanging = true;
+}
+
+void QGLEngineShaderManager::shaderDestroyed(QObject *shader)
+{
+    // Remove any shader programs which has this as the srcPixel shader:
+    for (int i = 0; i < cachedPrograms.size(); ++i) {
+        if (cachedPrograms.at(i).srcPixelFragShader == shader) {
+            delete cachedPrograms.at(i).program;
+            cachedPrograms.removeAt(i--);
+        }
+    }
+
+    shaderProgNeedsChanging = true;
+}
+
+void QGLEngineShaderManager::removeCustomStage(QGLCustomShaderStage* stage)
+{
+    Q_UNUSED(stage); // Currently we only support one at a time...
+
+    QGLShader *compiledShader = compiledShaders[CustomImageSrcFragmentShader];
+
+    if (!compiledShader)
+        return;
+
+    compiledShaders[CustomImageSrcFragmentShader] = 0;
+    customSrcStage = 0;
+    shaderProgNeedsChanging = true;
+}
+
+
 QGLShaderProgram* QGLEngineShaderManager::currentProgram()
 {
     return currentShaderProg->program;
@@ -332,6 +372,12 @@ bool QGLEngineShaderManager::useCorrectShaderProg()
     if (!shaderProgNeedsChanging)
         return false;
 
+    bool useCustomSrc = customSrcStage != 0;
+    if (useCustomSrc && srcPixelType != QGLEngineShaderManager::ImageSrc) {
+        useCustomSrc = false;
+        qWarning("QGLEngineShaderManager - Ignoring custom shader stage for non image src");
+    }
+
     QGLEngineShaderProg requiredProgram;
     requiredProgram.program = 0;
 
@@ -363,7 +409,11 @@ bool QGLEngineShaderManager::useCorrectShaderProg()
             qCritical("QGLEngineShaderManager::useCorrectShaderProg() - I'm scared, Qt::NoBrush style is set");
             break;
         case QGLEngineShaderManager::ImageSrc:
-            srcPixelFragShaderName = ImageSrcFragmentShader;
+            srcPixelFragShaderName = useCustomSrc ? CustomImageSrcFragmentShader : ImageSrcFragmentShader;
+            positionVertexShaderName = PositionOnlyVertexShader;
+            break;
+        case QGLEngineShaderManager::NonPremultipliedImageSrc:
+            srcPixelFragShaderName = NonPremultipliedImageSrcFragmentShader;
             positionVertexShaderName = PositionOnlyVertexShader;
             break;
         case QGLEngineShaderManager::PatternSrc:
@@ -375,10 +425,6 @@ bool QGLEngineShaderManager::useCorrectShaderProg()
             positionVertexShaderName = isAffine ? AffinePositionWithTextureBrushVertexShader
                                                 : PositionWithTextureBrushVertexShader;
             break;
-        case QGLEngineShaderManager::NonPremultipliedImageSrc:
-            srcPixelFragShaderName = NonPremultipliedImageSrcFragmentShader;
-            positionVertexShaderName = PositionOnlyVertexShader;
-            break;
         case Qt::SolidPattern:
             srcPixelFragShaderName = SolidBrushSrcFragmentShader;
             positionVertexShaderName = PositionOnlyVertexShader;
@@ -409,7 +455,6 @@ bool QGLEngineShaderManager::useCorrectShaderProg()
     requiredProgram.positionVertexShader = compiledShaders[positionVertexShaderName];
     requiredProgram.srcPixelFragShader = compiledShaders[srcPixelFragShaderName];
 
-
     const bool hasCompose = compositionMode > QPainter::CompositionMode_Plus;
     const bool hasMask = maskType != QGLEngineShaderManager::NoMask;
 
@@ -498,62 +543,63 @@ bool QGLEngineShaderManager::useCorrectShaderProg()
     else
         requiredProgram.compositionFragShader = 0;
 
-
     // At this point, requiredProgram is fully populated so try to find the program in the cache
+    bool foundProgramInCache = false;
     for (int i = 0; i < cachedPrograms.size(); ++i) {
-        QGLEngineShaderProg &prog = cachedPrograms[i];
-        if (    (prog.mainVertexShader == requiredProgram.mainVertexShader)
-             && (prog.positionVertexShader == requiredProgram.positionVertexShader)
-             && (prog.mainFragShader == requiredProgram.mainFragShader)
-             && (prog.srcPixelFragShader == requiredProgram.srcPixelFragShader)
-             && (prog.compositionFragShader == requiredProgram.compositionFragShader) )
-        {
-            currentShaderProg = &prog;
-            currentShaderProg->program->enable();
-            shaderProgNeedsChanging = false;
-            return true;
+        if (cachedPrograms[i] == requiredProgram) {
+            currentShaderProg = &cachedPrograms[i];
+            foundProgramInCache = true;
+            break;
         }
     }
 
-    // Shader program not found in cache, create it now.
-    requiredProgram.program = new QGLShaderProgram(ctx, this);
-    requiredProgram.program->addShader(requiredProgram.mainVertexShader);
-    requiredProgram.program->addShader(requiredProgram.positionVertexShader);
-    requiredProgram.program->addShader(requiredProgram.mainFragShader);
-    requiredProgram.program->addShader(requiredProgram.srcPixelFragShader);
-    requiredProgram.program->addShader(requiredProgram.maskFragShader);
-    requiredProgram.program->addShader(requiredProgram.compositionFragShader);
-
-    // We have to bind the vertex attribute names before the program is linked:
-    requiredProgram.program->bindAttributeLocation("vertexCoordsArray", QT_VERTEX_COORDS_ATTR);
-    if (useTextureCoords)
-        requiredProgram.program->bindAttributeLocation("textureCoordArray", QT_TEXTURE_COORDS_ATTR);
-
-    requiredProgram.program->link();
-    if (!requiredProgram.program->isLinked()) {
-        QString error;
-        qWarning() <<  "Shader program failed to link,"
+    // If the shader program's not found in the cache, create it now.
+    if (!foundProgramInCache) {
+        requiredProgram.program = new QGLShaderProgram(ctx, this);
+        requiredProgram.program->addShader(requiredProgram.mainVertexShader);
+        requiredProgram.program->addShader(requiredProgram.positionVertexShader);
+        requiredProgram.program->addShader(requiredProgram.mainFragShader);
+        requiredProgram.program->addShader(requiredProgram.srcPixelFragShader);
+        requiredProgram.program->addShader(requiredProgram.maskFragShader);
+        requiredProgram.program->addShader(requiredProgram.compositionFragShader);
+
+        // We have to bind the vertex attribute names before the program is linked:
+        requiredProgram.program->bindAttributeLocation("vertexCoordsArray", QT_VERTEX_COORDS_ATTR);
+        if (useTextureCoords)
+            requiredProgram.program->bindAttributeLocation("textureCoordArray", QT_TEXTURE_COORDS_ATTR);
+
+        requiredProgram.program->link();
+        if (!requiredProgram.program->isLinked()) {
+            QString error;
+            qWarning() <<  "Shader program failed to link,"
 #if defined(QT_DEBUG)
-              << '\n'
-              << "  Shaders Used:" << '\n'
-              << "    mainVertexShader = "     << requiredProgram.mainVertexShader->objectName()  << '\n'
-              << "    positionVertexShader = " << requiredProgram.positionVertexShader->objectName() << '\n'
-              << "    mainFragShader = "       << requiredProgram.mainFragShader->objectName() << '\n'
-              << "    srcPixelFragShader = "   << requiredProgram.srcPixelFragShader->objectName() << '\n'
-              << "    maskFragShader = "       << requiredProgram.maskFragShader->objectName() << '\n'
-              << "    compositionFragShader = "<< requiredProgram.compositionFragShader->objectName() << '\n'
+                  << '\n'
+                  << "  Shaders Used:" << '\n'
+                  << "    mainVertexShader = "     << requiredProgram.mainVertexShader->objectName()  << '\n'
+                  << "    positionVertexShader = " << requiredProgram.positionVertexShader->objectName() << '\n'
+                  << "    mainFragShader = "       << requiredProgram.mainFragShader->objectName() << '\n'
+                  << "    srcPixelFragShader = "   << requiredProgram.srcPixelFragShader->objectName() << '\n'
+                  << "    maskFragShader = "       << requiredProgram.maskFragShader->objectName() << '\n'
+                  << "    compositionFragShader = "<< requiredProgram.compositionFragShader->objectName() << '\n'
 #endif
-              << "  Error Log:" << '\n'
-              << "    " << requiredProgram.program->log();
-        qWarning() << error;
+                  << "  Error Log:" << '\n'
+                  << "    " << requiredProgram.program->log();
+            qWarning() << error;
+            delete requiredProgram.program;
+        } else {
+            cachedPrograms.append(requiredProgram);
+            // taking the address here is safe since
+            // cachePrograms isn't resized anywhere else
+            currentShaderProg = &cachedPrograms.last();
+        }
     }
-    else {
-        cachedPrograms.append(requiredProgram);
-        // taking the address here is safe since
-        // cachePrograms isn't resized anywhere else
-        currentShaderProg = &cachedPrograms.last();
+
+    if (currentShaderProg) {
         currentShaderProg->program->enable();
+        if (useCustomSrc)
+            customSrcStage->setUniforms(currentShaderProg->program);
     }
+
     shaderProgNeedsChanging = false;
     return true;
 }
@@ -563,8 +609,27 @@ void QGLEngineShaderManager::compileNamedShader(QGLEngineShaderManager::ShaderNa
     if (compiledShaders[name])
         return;
 
-    QGLShader *newShader = new QGLShader(type, ctx, this);
-    newShader->compile(qglEngineShaderSourceCode[name]);
+    QGLShader *newShader;
+
+    QByteArray source;
+    if (name == CustomImageSrcFragmentShader) {
+        source = customSrcStage->source();
+        source += qglslCustomSrcFragmentShader;
+
+        newShader = customShaderCache.object(source);
+        if (!newShader) {
+            newShader = new QGLShader(type, ctx, this);
+            newShader->compile(source);
+            customShaderCache.insert(source, newShader);
+
+            connect(newShader, SIGNAL(destroyed(QObject *)),
+                    this, SLOT(shaderDestroyed(QObject *)));
+        }
+    } else {
+        source = qglEngineShaderSourceCode[name];
+        newShader = new QGLShader(type, ctx, this);
+        newShader->compile(source);
+    }
 
 #if defined(QT_DEBUG)
     // Name the shader for easier debugging
diff --git a/src/opengl/gl2paintengineex/qglengineshadermanager_p.h b/src/opengl/gl2paintengineex/qglengineshadermanager_p.h
index b314998..1ee75df 100644
--- a/src/opengl/gl2paintengineex/qglengineshadermanager_p.h
+++ b/src/opengl/gl2paintengineex/qglengineshadermanager_p.h
@@ -199,19 +199,23 @@
         O = Global Opacity
 
 
-    CUSTOM SHADER CODE (idea, depricated)
+    CUSTOM SHADER CODE
     ==================
 
     The use of custom shader code is supported by the engine for drawImage and
     drawPixmap calls. This is implemented via hooks in the fragment pipeline.
+
     The custom shader is passed to the engine as a partial fragment shader
-    (QGLCustomizedShader). The shader will implement a pre-defined method name
-    which Qt's fragment pipeline will call. There are two different hooks which
-    can be implemented as custom shader code:
+    (QGLCustomShaderStage). The shader will implement a pre-defined method name
+    which Qt's fragment pipeline will call:
+
+        lowp vec4 customShader(sampler2d src, vec2 srcCoords)
 
-        mediump vec4 customShader(sampler2d src, vec2 srcCoords)
-        mediump vec4 customShaderWithDest(sampler2d dest, sampler2d src, vec2 srcCoords)
+    The provided src and srcCoords parameters can be used to sample from the
+    source image.
 
+    Transformations, clipping, opacity, and composition modes set using QPainter
+    will be respected when using the custom shader hook.
 */
 
 #ifndef QGLENGINE_SHADER_MANAGER_H
@@ -221,6 +225,7 @@
 #include <QGLShaderProgram>
 #include <QPainter>
 #include <private/qgl_p.h>
+#include <private/qglcustomshaderstage_p.h>
 
 QT_BEGIN_HEADER
 
@@ -228,7 +233,6 @@ QT_BEGIN_NAMESPACE
 
 QT_MODULE(OpenGL)
 
-
 struct QGLEngineShaderProg
 {
     QGLShader*          mainVertexShader;
@@ -240,6 +244,17 @@ struct QGLEngineShaderProg
     QGLShaderProgram*   program;
 
     QVector<uint> uniformLocations;
+
+    bool operator==(const QGLEngineShaderProg& other) {
+        // We don't care about the program
+        return ( mainVertexShader      == other.mainVertexShader &&
+                 positionVertexShader  == other.positionVertexShader &&
+                 mainFragShader        == other.mainFragShader &&
+                 srcPixelFragShader    == other.srcPixelFragShader &&
+                 maskFragShader        == other.maskFragShader &&
+                 compositionFragShader == other.compositionFragShader
+               );
+    }
 };
 
 /*
@@ -260,7 +275,7 @@ struct QGLEngineCachedShaderProg
 static const GLuint QT_VERTEX_COORDS_ATTR  = 0;
 static const GLuint QT_TEXTURE_COORDS_ATTR = 1;
 
-class QGLEngineShaderManager : public QObject
+class Q_OPENGL_EXPORT QGLEngineShaderManager : public QObject
 {
     Q_OBJECT
 public:
@@ -305,6 +320,8 @@ public:
     void setUseGlobalOpacity(bool);
     void setMaskType(MaskType);
     void setCompositionMode(QPainter::CompositionMode);
+    void setCustomStage(QGLCustomShaderStage* stage);
+    void removeCustomStage(QGLCustomShaderStage* stage);
 
     uint getUniformLocation(Uniform id);
 
@@ -344,8 +361,10 @@ public:
         MainFragmentShader,
 
         ImageSrcFragmentShader,
+        CustomSrcFragmentShader,
         ImageSrcWithPatternFragmentShader,
         NonPremultipliedImageSrcFragmentShader,
+        CustomImageSrcFragmentShader,
         SolidBrushSrcFragmentShader,
         TextureBrushSrcFragmentShader,
         TextureBrushSrcWithPatternFragmentShader,
@@ -389,6 +408,8 @@ public:
     Q_ENUMS(ShaderName)
 #endif
 
+private slots:
+    void shaderDestroyed(QObject *shader);
 
 private:
     QGLContext*     ctx;
@@ -401,6 +422,7 @@ private:
     MaskType                    maskType;
     bool                        useTextureCoords;
     QPainter::CompositionMode   compositionMode;
+    QGLCustomShaderStage*       customSrcStage;
 
     QGLShaderProgram*     blitShaderProg;
     QGLShaderProgram*     simpleShaderProg;
@@ -408,6 +430,7 @@ private:
 
     // TODO: Possibly convert to a LUT
     QList<QGLEngineShaderProg> cachedPrograms;
+    QCache<QByteArray, QGLShader> customShaderCache;
 
     QGLShader* compiledShaders[TotalShaderCount];
 
diff --git a/src/opengl/gl2paintengineex/qglengineshadersource_p.h b/src/opengl/gl2paintengineex/qglengineshadersource_p.h
index c80d6e1..cf930f3 100644
--- a/src/opengl/gl2paintengineex/qglengineshadersource_p.h
+++ b/src/opengl/gl2paintengineex/qglengineshadersource_p.h
@@ -290,6 +290,14 @@ static const char* const qglslImageSrcFragmentShader = "\
         return texture2D(imageTexture, textureCoords); \
     }";
 
+static const char* const qglslCustomSrcFragmentShader = "\
+    varying highp vec2      textureCoords; \
+    uniform       sampler2D imageTexture; \
+    lowp vec4 customShader(sampler2D texture, vec2 coords); \
+    lowp vec4 srcPixel() { \
+        return customShader(imageTexture, textureCoords); \
+    }";
+
 static const char* const qglslImageSrcWithPatternFragmentShader = "\
     varying highp vec2      textureCoords; \
     uniform lowp  vec4      patternColor; \
diff --git a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
index c3f2de1..7a3fa56 100644
--- a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
+++ b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
@@ -720,6 +720,12 @@ void QGL2PaintEngineEx::sync()
     d->needsSync = true;
 }
 
+const QGLContext *QGL2PaintEngineEx::context()
+{
+    Q_D(QGL2PaintEngineEx);
+    return d->ctx;
+}
+
 void QGL2PaintEngineExPrivate::transferMode(EngineMode newMode)
 {
     if (newMode == mode)
@@ -1116,6 +1122,21 @@ void QGL2PaintEngineEx::drawImage(const QRectF& dest, const QImage& image, const
     d->drawTexture(dest, src, image.size(), !image.hasAlphaChannel());
 }
 
+void QGL2PaintEngineEx::drawTexture(const QRectF &dest, GLuint textureId, const QSize &size, const QRectF &src)
+{
+    Q_D(QGL2PaintEngineEx);
+    ensureActive();
+    d->transferMode(ImageDrawingMode);
+
+    QGLContext *ctx = d->ctx;
+    glActiveTexture(GL_TEXTURE0 + QT_IMAGE_TEXTURE_UNIT);
+    glBindTexture(GL_TEXTURE_2D, textureId);
+
+    d->updateTextureFilter(GL_TEXTURE_2D, GL_REPEAT,
+                           state()->renderHints & QPainter::SmoothPixmapTransform, textureId);
+    d->drawTexture(dest, src, size, false);
+}
+
 void QGL2PaintEngineEx::drawTextItem(const QPointF &p, const QTextItem &textItem)
 {
     Q_D(QGL2PaintEngineEx);
@@ -1720,6 +1741,14 @@ QOpenGL2PaintEngineState::~QOpenGL2PaintEngineState()
 {
 }
 
+QPixmapFilter *QGL2PaintEngineEx::createPixmapFilter(int type) const
+{
+    const QGLContext *ctx = QGLContext::currentContext();
+    if (ctx)
+        return ctx->d_func()->createPixmapFilter(type);
+    return 0;
+}
+
 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 fa216bc..7b734e3 100644
--- a/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h
+++ b/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h
@@ -90,8 +90,7 @@ public:
     bool hasRectangleClip;
 };
 
-
-class QGL2PaintEngineEx : public QPaintEngineEx
+class Q_OPENGL_EXPORT QGL2PaintEngineEx : public QPaintEngineEx
 {
     Q_DECLARE_PRIVATE(QGL2PaintEngineEx)
 public:
@@ -118,12 +117,13 @@ public:
 
 
     virtual void drawPixmap(const QRectF &r, const QPixmap &pm, const QRectF &sr);
-
     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);
 
-    Type type() const { return OpenGL; }
+    Type type() const { return OpenGL2; }
 
     void setState(QPainterState *s);
     QPainterState *createState(QPainterState *orig) const;
@@ -135,10 +135,15 @@ public:
     }
     virtual void sync();
 
+    const QGLContext* context();
+
+    QPixmapFilter *createPixmapFilter(int type) const;
+
 private:
     Q_DISABLE_COPY(QGL2PaintEngineEx)
 };
 
+
 class QGL2PaintEngineExPrivate : public QPaintEngineExPrivate
 {
     Q_DECLARE_PUBLIC(QGL2PaintEngineEx)
@@ -147,7 +152,7 @@ public:
             q(q_ptr),
             width(0), height(0),
             ctx(0),
-            currentBrush( &(q->state()->brush) ),
+            currentBrush(0),
             inverseScale(1),
             shaderManager(0)
     { }
diff --git a/src/opengl/opengl.pro b/src/opengl/opengl.pro
index 4231721..458aa7e 100644
--- a/src/opengl/opengl.pro
+++ b/src/opengl/opengl.pro
@@ -38,6 +38,7 @@ SOURCES	+= qgl.cpp \
 !contains(QT_CONFIG, opengles1):!contains(QT_CONFIG, opengles1cl) {
     HEADERS +=  qglshaderprogram.h \
                 qglpixmapfilter_p.h  \
+                qgraphicsshadereffect.h \
                 qgraphicssystem_gl_p.h \
                 qwindowsurface_gl_p.h \
                 qpixmapdata_gl_p.h \
@@ -45,17 +46,20 @@ SOURCES	+= qgl.cpp \
                 gl2paintengineex/qglengineshadermanager_p.h \
                 gl2paintengineex/qgl2pexvertexarray_p.h \
                 gl2paintengineex/qpaintengineex_opengl2_p.h \
-                gl2paintengineex/qglengineshadersource_p.h
+                gl2paintengineex/qglengineshadersource_p.h \
+                gl2paintengineex/qglcustomshaderstage_p.h
 
     SOURCES +=  qglshaderprogram.cpp \
                 qglpixmapfilter.cpp \
+                qgraphicsshadereffect.cpp \
                 qgraphicssystem_gl.cpp \
                 qwindowsurface_gl.cpp \
                 qpixmapdata_gl.cpp \
                 gl2paintengineex/qglgradientcache.cpp \
                 gl2paintengineex/qglengineshadermanager.cpp \
                 gl2paintengineex/qgl2pexvertexarray.cpp \
-                gl2paintengineex/qpaintengineex_opengl2.cpp
+                gl2paintengineex/qpaintengineex_opengl2.cpp \
+                gl2paintengineex/qglcustomshaderstage.cpp
 
 }
 
diff --git a/src/opengl/qglpixmapfilter.cpp b/src/opengl/qglpixmapfilter.cpp
index f8e4226..29f6440 100644
--- a/src/opengl/qglpixmapfilter.cpp
+++ b/src/opengl/qglpixmapfilter.cpp
@@ -40,20 +40,24 @@
 ****************************************************************************/
 
 #include "private/qpixmapfilter_p.h"
+#include "private/qpixmapdata_gl_p.h"
+#include "private/qpaintengineex_opengl2_p.h"
+#include "private/qglengineshadermanager_p.h"
 #include "qglpixmapfilter_p.h"
 #include "qgraphicssystem_gl_p.h"
 #include "qpaintengine_opengl_p.h"
+#include "qcache.h"
 
-#include "qglpixelbuffer.h"
+#include "qglframebufferobject.h"
 #include "qglshaderprogram.h"
 #include "qgl_p.h"
 
 #include "private/qapplication_p.h"
+#include "private/qmath_p.h"
 
 
 QT_BEGIN_NAMESPACE
 
-
 void QGLPixmapFilterBase::bindTexture(const QPixmap &src) const
 {
     const_cast<QGLContext *>(QGLContext::currentContext())->d_func()->bindTexture(src, GL_TEXTURE_2D, GL_RGBA, true, false);
@@ -97,6 +101,27 @@ private:
     mutable int m_kernelHeight;
 };
 
+class QGLPixmapBlurFilter : public QGLCustomShaderStage, public QGLPixmapFilter<QPixmapBlurFilter>
+{
+public:
+    QGLPixmapBlurFilter();
+    ~QGLPixmapBlurFilter();
+
+    void setUniforms(QGLShaderProgram *program);
+
+protected:
+    bool processGL(QPainter *painter, const QPointF &pos, const QPixmap &src, const QRectF &srcRect) const;
+
+private:
+    static QByteArray generateBlurShader(int radius, bool gaussianBlur);
+
+    mutable QGLShader *m_shader;
+
+    mutable QSize m_textureSize;
+
+    QGLShaderProgram *m_program;
+};
+
 extern QGLWidget *qt_gl_share_widget();
 
 QPixmapFilter *QGLContextPrivate::createPixmapFilter(int type) const
@@ -105,6 +130,8 @@ QPixmapFilter *QGLContextPrivate::createPixmapFilter(int type) const
     case QPixmapFilter::ColorizeFilter:
         return new QGLPixmapColorizeFilter;
 
+    case QPixmapFilter::BlurFilter:
+        return new QGLPixmapBlurFilter;
 
     case QPixmapFilter::ConvolutionFilter:
         return new QGLPixmapConvolutionFilter;
@@ -281,4 +308,250 @@ bool QGLPixmapConvolutionFilter::processGL(QPainter *, const QPointF &pos, const
     return true;
 }
 
+QGLPixmapBlurFilter::QGLPixmapBlurFilter()
+{
+}
+
+QGLPixmapBlurFilter::~QGLPixmapBlurFilter()
+{
+}
+
+bool QGLPixmapBlurFilter::processGL(QPainter *painter, const QPointF &pos, const QPixmap &src, const QRectF &) const
+{
+    QGLPixmapBlurFilter *filter = const_cast<QGLPixmapBlurFilter *>(this);
+    filter->setSource(generateBlurShader(radius(), quality() == Qt::SmoothTransformation));
+
+    QGLFramebufferObjectFormat format;
+    format.setInternalFormat(src.hasAlphaChannel() ? GL_RGBA : GL_RGB);
+    QGLFramebufferObject *fbo = qgl_fbo_pool()->acquire(src.size(), format);
+
+    if (!fbo)
+        return false;
+
+    glBindTexture(GL_TEXTURE_2D, fbo->texture());
+
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(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);
+
+    QGL2PaintEngineEx *engine = static_cast<QGL2PaintEngineEx *>(painter->paintEngine());
+
+    engine->syncState();
+    painter->save();
+
+    // ensure GL_LINEAR filtering is used
+    painter->setRenderHint(QPainter::SmoothPixmapTransform);
+
+    // prepare for updateUniforms
+    m_textureSize = src.size();
+
+    // first pass, to fbo
+    fbo->bind();
+    if (src.hasAlphaChannel()) {
+        glClearColor(0, 0, 0, 0);
+        glClear(GL_COLOR_BUFFER_BIT);
+    }
+
+    filter->setOnPainter(painter);
+
+    QTransform transform = engine->state()->matrix;
+    if (!transform.isIdentity()) {
+        engine->state()->matrix = QTransform();
+        engine->transformChanged();
+    }
+
+    engine->drawPixmap(src.rect().translated(0, painter->device()->height() - fbo->height()),
+                       src, src.rect());
+
+    if (!transform.isIdentity()) {
+        engine->state()->matrix = transform;
+        engine->transformChanged();
+    }
+
+    fbo->release();
+
+    // second pass, to widget
+    m_program->setUniformValue("delta", 0.0, 1.0);
+    engine->drawTexture(src.rect().translated(pos.x(), pos.y()), fbo->texture(), fbo->size(), src.rect().translated(0, fbo->height() - src.height()));
+    filter->removeFromPainter(painter);
+
+    painter->restore();
+
+    qgl_fbo_pool()->release(fbo);
+
+    return true;
+}
+
+void QGLPixmapBlurFilter::setUniforms(QGLShaderProgram *program)
+{
+    program->setUniformValue("invTextureSize", 1.0 / m_textureSize.width(), 1.0 / m_textureSize.height());
+    program->setUniformValue("delta", 1.0, 0.0);
+
+    m_program = program;
+}
+
+static inline qreal gaussian(qreal dx, qreal sigma)
+{
+    return exp(-dx * dx / (2 * sigma * sigma)) / (Q_2PI * sigma * sigma);
+}
+
+QByteArray QGLPixmapBlurFilter::generateBlurShader(int radius, bool gaussianBlur)
+{
+    Q_ASSERT(radius >= 1);
+
+    QByteArray source;
+    source.reserve(1000);
+
+    source.append("uniform highp vec2      invTextureSize;\n");
+
+    bool separateXY = true;
+    bool clip = false;
+
+    if (separateXY) {
+        source.append("uniform highp vec2      delta;\n");
+
+        if (clip)
+            source.append("uniform highp vec2      clip;\n");
+    } else if (clip) {
+        source.append("uniform highp vec4      clip;\n");
+    }
+
+    source.append("mediump vec4 customShader(sampler2D src, vec2 srcCoords) {\n");
+
+    QVector<qreal> sampleOffsets;
+    QVector<qreal> weights;
+
+    if (gaussianBlur) {
+        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;
+        }
+
+        // odd size ?
+        if (gaussianComponents.size() & 1) {
+            sampleOffsets << radius;
+            weights << gaussianComponents.last();
+        }
+    } else {
+        for (int i = 0; i < radius; ++i) {
+            sampleOffsets << 2 * i - radius + 0.5;
+            weights << qreal(1);
+        }
+        sampleOffsets << radius;
+        weights << qreal(0.5);
+    }
+
+    int currentVariable = 1;
+    source.append("    mediump vec4 sample = vec4(0.0);\n");
+    source.append("    mediump vec2 coord;\n");
+
+    qreal weightSum = 0;
+    if (separateXY) {
+        source.append("    mediump float c;\n");
+        for (int i = 0; i < sampleOffsets.size(); ++i) {
+            qreal delta = sampleOffsets.at(i);
+
+            ++currentVariable;
+
+            QByteArray coordinate = "srcCoords";
+            if (delta != qreal(0)) {
+                coordinate.append(" + invTextureSize * delta * float(");
+                coordinate.append(QByteArray::number(delta));
+                coordinate.append(")");
+            }
+
+            source.append("    coord = ");
+            source.append(coordinate);
+            source.append(";\n");
+
+            if (clip) {
+                source.append("    c = dot(coord, delta);\n");
+                source.append("    if (c > clip.x && c < clip.y)\n    ");
+            }
+
+            source.append("    sample += texture2D(src, coord)");
+
+            weightSum += weights.at(i);
+            if (weights.at(i) != qreal(1)) {
+                source.append(" * float(");
+                source.append(QByteArray::number(weights.at(i)));
+                source.append(");\n");
+            } else {
+                source.append(";\n");
+            }
+        }
+    } else {
+        for (int y = 0; y < sampleOffsets.size(); ++y) {
+            for (int x = 0; x < sampleOffsets.size(); ++x) {
+                QByteArray coordinate = "srcCoords";
+
+                qreal dx = sampleOffsets.at(x);
+                qreal dy = sampleOffsets.at(y);
+
+                if (dx != qreal(0) || dy != qreal(0)) {
+                    coordinate.append(" + invTextureSize * vec2(float(");
+                    coordinate.append(QByteArray::number(dx));
+                    coordinate.append("), float(");
+                    coordinate.append(QByteArray::number(dy));
+                    coordinate.append("))");
+                }
+
+                source.append("    coord = ");
+                source.append(coordinate);
+                source.append(";\n");
+
+                if (clip)
+                    source.append("    if (coord.x > clip.x && coord.x < clip.y && coord.y > clip.z && coord.y < clip.w)\n    ");
+
+                source.append("    sample += texture2D(src, coord)");
+
+                ++currentVariable;
+
+                weightSum += weights.at(x) * weights.at(y);
+                if ((weights.at(x) != qreal(1) || weights.at(y) != qreal(1))) {
+                    source.append(" * float(");
+                    source.append(QByteArray::number(weights.at(x) * weights.at(y)));
+                    source.append(");\n");
+                } else {
+                    source.append(";\n");
+                }
+            }
+        }
+    }
+
+    source.append("    return ");
+    if (!gaussianBlur) {
+        source.append("float(");
+        if (separateXY)
+            source.append(QByteArray::number(1 / weightSum));
+        else
+            source.append(QByteArray::number(1 / weightSum));
+        source.append(") * ");
+    }
+    source.append("sample;\n");
+    source.append("}\n");
+
+    return source;
+}
+
 QT_END_NAMESPACE
diff --git a/src/opengl/qgraphicsshadereffect.cpp b/src/opengl/qgraphicsshadereffect.cpp
new file mode 100644
index 0000000..e8741b5
--- /dev/null
+++ b/src/opengl/qgraphicsshadereffect.cpp
@@ -0,0 +1,321 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qgraphicsshadereffect.h"
+#if !defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL)
+#include "qglshaderprogram.h"
+#include "gl2paintengineex/qglcustomshaderstage_p.h"
+#define QGL_HAVE_CUSTOM_SHADERS 1
+#endif
+#include <QtGui/qpainter.h>
+#include <QtGui/qgraphicsitem.h>
+#include <QtGui/private/qgraphicseffect_p.h>
+
+QT_BEGIN_NAMESPACE
+
+#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW
+
+/*!
+    \class QGraphicsShaderEffect
+    \brief The QGraphicsShaderEffect class is the base class for creating
+    custom GLSL shader effects in a QGraphicsScene.
+    \since 4.6
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    The specific effect is defined by a fragment of GLSL source code
+    supplied to setPixelShaderFragment().  This source code must define a
+    function called \c{srcPixel()} that returns the source pixel value
+    to use in the paint engine's shader program.  The shader fragment
+    is linked with the regular shader code used by the GL2 paint engine
+    to construct a complete QGLShaderProgram.
+
+    The following example shader converts the incoming pixmap to
+    grayscale and then applies a colorize operation using the
+    \c effectColor value:
+
+    \code
+    static char const colorizeShaderCode[] =
+        "varying highp vec2 textureCoords;\n"
+        "uniform sampler2D imageTexture;\n"
+        "uniform lowp vec4 effectColor;\n"
+        "lowp vec4 srcPixel() {\n"
+        "    vec4 src = texture2D(imageTexture, textureCoords);\n"
+        "    float gray = dot(src.rgb, vec3(0.212671, 0.715160, 0.072169));\n"
+        "    vec4 colorize = 1.0-((1.0-gray)*(1.0-effectColor));\n"
+        "    return vec4(colorize.rgb, src.a);\n"
+        "}";
+    \endcode
+
+    To use this shader code, it is necessary to define a subclass
+    of QGraphicsShaderEffect as follows:
+
+    \code
+    class ColorizeEffect : public QGraphicsShaderEffect
+    {
+        Q_OBJECT
+    public:
+        ColorizeEffect(QObject *parent = 0)
+            : QGraphicsShaderEffect(parent), color(Qt::black)
+        {
+            setPixelShaderFragment(colorizeShaderCode);
+        }
+
+        QColor effectColor() const { return color; }
+        void setEffectColor(const QColor& c)
+        {
+            color = c;
+            setUniformsDirty();
+        }
+
+    protected:
+        void setUniforms(QGLShaderProgram *program)
+        {
+            program->setUniformValue("effectColor", color);
+        }
+
+    private:
+        QColor color;
+    };
+    \endcode
+
+    The setUniforms() function is called when the effect is about
+    to be used for drawing to give the subclass the opportunity to
+    set effect-specific uniform variables.
+
+    QGraphicsShaderEffect is only supported when the GL2 paint engine
+    is in use.  When any other paint engine is in use (GL1, raster, etc),
+    the drawItem() method will draw its item argument directly with
+    no effect applied.
+
+    \sa QGrapicsEffect
+*/
+
+static const char qglslDefaultImageFragmentShader[] = "\
+    varying highp vec2 textureCoords; \
+    uniform sampler2D imageTexture; \
+    lowp vec4 srcPixel() { \
+        return texture2D(imageTexture, textureCoords); \
+    }\n";
+
+#ifdef QGL_HAVE_CUSTOM_SHADERS
+
+class QGLCustomShaderEffectStage : public QGLCustomShaderStage
+{
+public:
+    QGLCustomShaderEffectStage
+            (QGraphicsShaderEffect *e, const QByteArray& source)
+        : QGLCustomShaderStage(),
+          effect(e)
+    {
+        setSource(source);
+    }
+
+    void setUniforms(QGLShaderProgram *program);
+
+    QGraphicsShaderEffect *effect;
+};
+
+void QGLCustomShaderEffectStage::setUniforms(QGLShaderProgram *program)
+{
+    effect->setUniforms(program);
+}
+
+#endif
+
+class QGraphicsShaderEffectPrivate : public QGraphicsEffectPrivate
+{
+    Q_DECLARE_PUBLIC(QGraphicsShaderEffect)
+public:
+    QGraphicsShaderEffectPrivate()
+        : pixelShaderFragment(qglslDefaultImageFragmentShader)
+#ifdef QGL_HAVE_CUSTOM_SHADERS
+          , customShaderStage(0)
+#endif
+    {
+    }
+
+    QByteArray pixelShaderFragment;
+#ifdef QGL_HAVE_CUSTOM_SHADERS
+    QGLCustomShaderEffectStage *customShaderStage;
+#endif
+};
+
+/*!
+    Constructs a shader effect and attaches it to \a parent.
+*/
+QGraphicsShaderEffect::QGraphicsShaderEffect(QObject *parent)
+    : QGraphicsEffect(*new QGraphicsShaderEffectPrivate(), parent)
+{
+}
+
+/*!
+    Destroys this shader effect.
+*/
+QGraphicsShaderEffect::~QGraphicsShaderEffect()
+{
+#ifdef QGL_HAVE_CUSTOM_SHADERS
+    Q_D(QGraphicsShaderEffect);
+    delete d->customShaderStage;
+#endif
+}
+
+/*!
+    Returns the source code for the pixel shader fragment for
+    this shader effect.  The default is a shader that copies
+    its incoming pixmap directly to the output with no effect
+    applied.
+
+    \sa setPixelShaderFragment()
+*/
+QByteArray QGraphicsShaderEffect::pixelShaderFragment() const
+{
+    Q_D(const QGraphicsShaderEffect);
+    return d->pixelShaderFragment;
+}
+
+/*!
+    Sets the source code for the pixel shader fragment for
+    this shader effect to \a code.
+
+    The \a code must define a GLSL function called \c{srcPixel()}
+    that returns the source pixel value to use in the paint engine's
+    shader program.  The following is the default pixel shader fragment,
+    which draws a pixmap with no effect applied:
+
+    \code
+    varying highp vec2 textureCoords;
+    uniform sampler2D imageTexture;
+    lowp vec4 srcPixel() {
+        return texture2D(imageTexture, textureCoords);
+    }
+    \endcode
+
+    \sa pixelShaderFragment(), setUniforms()
+*/
+void QGraphicsShaderEffect::setPixelShaderFragment(const QByteArray& code)
+{
+    Q_D(QGraphicsShaderEffect);
+    if (d->pixelShaderFragment != code) {
+        d->pixelShaderFragment = code;
+#ifdef QGL_HAVE_CUSTOM_SHADERS
+        delete d->customShaderStage;
+        d->customShaderStage = 0;
+#endif
+    }
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsShaderEffect::draw(QPainter *painter, QGraphicsEffectSource *source)
+{
+    Q_D(QGraphicsShaderEffect);
+
+#ifdef QGL_HAVE_CUSTOM_SHADERS
+    // Set the custom shader on the paint engine.  The setOnPainter()
+    // call may fail if the paint engine is not GL2.  In that case,
+    // we fall through to drawing the pixmap normally.
+    if (!d->customShaderStage) {
+        d->customShaderStage = new QGLCustomShaderEffectStage
+            (this, d->pixelShaderFragment);
+    }
+    bool usingShader = d->customShaderStage->setOnPainter(painter);
+
+    QPoint offset;
+    if (source->isPixmap()) {
+        // No point in drawing in device coordinates (pixmap will be scaled anyways).
+        const QPixmap pixmap = source->pixmap(Qt::LogicalCoordinates, &offset);
+        painter->drawPixmap(offset, pixmap);
+    } else {
+        // Draw pixmap in device coordinates to avoid pixmap scaling.
+        const QPixmap pixmap = source->pixmap(Qt::DeviceCoordinates, &offset);
+        QTransform restoreTransform = painter->worldTransform();
+        painter->setWorldTransform(QTransform());
+        painter->drawPixmap(offset, pixmap);
+        painter->setWorldTransform(restoreTransform);
+    }
+
+    // Remove the custom shader to return to normal painting operations.
+    if (usingShader)
+        d->customShaderStage->removeFromPainter(painter);
+#else
+    source->draw(painter);
+#endif
+}
+
+/*!
+    Sets the custom uniform variables on this shader effect to
+    be dirty.  The setUniforms() function will be called the next
+    time the shader program corresponding to this effect is used.
+
+    This function is typically called by subclasses when an
+    effect-specific parameter is changed by the application.
+
+    \sa setUniforms()
+*/
+void QGraphicsShaderEffect::setUniformsDirty()
+{
+#ifdef QGL_HAVE_CUSTOM_SHADERS
+    Q_D(QGraphicsShaderEffect);
+    if (d->customShaderStage)
+        d->customShaderStage->setUniformsDirty();
+#endif
+}
+
+/*!
+    Sets custom uniform variables on the current GL context when
+    \a program is about to be used by the paint engine.
+
+    This function should be overridden if the shader set with
+    setPixelShaderFragment() has additional parameters beyond
+    those that the paint engine normally sets itself.
+
+    \sa setUniformsDirty()
+*/
+void QGraphicsShaderEffect::setUniforms(QGLShaderProgram *program)
+{
+    Q_UNUSED(program);
+}
+
+#endif // QT_NO_GRAPHICSVIEW
+
+QT_END_NAMESPACE
diff --git a/src/opengl/qgraphicsshadereffect.h b/src/opengl/qgraphicsshadereffect.h
new file mode 100644
index 0000000..1612431
--- /dev/null
+++ b/src/opengl/qgraphicsshadereffect.h
@@ -0,0 +1,87 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGRAPHICSSHADEREFFECT_H
+#define QGRAPHICSSHADEREFFECT_H
+
+#include <QtGui/qgraphicseffect.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(OpenGL)
+
+#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW
+
+class QGLShaderProgram;
+class QGLCustomShaderEffectStage;
+class QGraphicsShaderEffectPrivate;
+
+class Q_OPENGL_EXPORT QGraphicsShaderEffect : public QGraphicsEffect
+{
+    Q_OBJECT
+public:
+    QGraphicsShaderEffect(QObject *parent = 0);
+    virtual ~QGraphicsShaderEffect();
+
+    QByteArray pixelShaderFragment() const;
+    void setPixelShaderFragment(const QByteArray& code);
+
+protected:
+    void draw(QPainter *painter, QGraphicsEffectSource *source);
+    void setUniformsDirty();
+    virtual void setUniforms(QGLShaderProgram *program);
+
+private:
+    Q_DECLARE_PRIVATE(QGraphicsShaderEffect)
+    Q_DISABLE_COPY(QGraphicsShaderEffect)
+
+    friend class QGLCustomShaderEffectStage;
+};
+
+#endif // QT_NO_GRAPHICSVIEW
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QGRAPHICSSHADEREFFECT_H
diff --git a/src/opengl/qpixmapdata_gl.cpp b/src/opengl/qpixmapdata_gl.cpp
index 8de1aae..a441a23 100644
--- a/src/opengl/qpixmapdata_gl.cpp
+++ b/src/opengl/qpixmapdata_gl.cpp
@@ -55,6 +55,85 @@ QT_BEGIN_NAMESPACE
 
 extern QGLWidget* qt_gl_share_widget();
 
+/*!
+    \class QGLFramebufferObjectPool
+    \since 4.6
+
+    \brief The QGLFramebufferObject class provides a pool of framebuffer
+    objects for offscreen rendering purposes.
+
+    When requesting an FBO of a given size and format, an FBO of the same
+    format and a size at least as big as the requested size will be returned.
+
+    \internal
+*/
+
+static inline int areaDiff(const QSize &size, const QGLFramebufferObject *fbo)
+{
+    return qAbs(size.width() * size.height() - fbo->width() * fbo->height());
+}
+
+QGLFramebufferObject *QGLFramebufferObjectPool::acquire(const QSize &requestSize, const QGLFramebufferObjectFormat &requestFormat)
+{
+    QGLFramebufferObject *chosen = 0;
+    QGLFramebufferObject *candidate = 0;
+    for (int i = 0; !chosen && i < m_fbos.size(); ++i) {
+        QGLFramebufferObject *fbo = m_fbos.at(i);
+
+        QGLFramebufferObjectFormat format = fbo->format();
+        if (format.samples() == requestFormat.samples()
+            && format.attachment() == requestFormat.attachment()
+            && format.textureTarget() == requestFormat.textureTarget()
+            && format.internalFormat() == requestFormat.internalFormat())
+        {
+            // choose the fbo with a matching format and the closest size
+            if (!candidate || areaDiff(requestSize, candidate) > areaDiff(requestSize, fbo))
+                candidate = fbo;
+        }
+
+        if (candidate) {
+            m_fbos.removeOne(candidate);
+
+            const QSize fboSize = candidate->size();
+            QSize sz = fboSize;
+
+            if (sz.width() < requestSize.width())
+                sz.setWidth(qMax(requestSize.width(), qRound(sz.width() * 1.5)));
+            if (sz.height() < requestSize.height())
+                sz.setHeight(qMax(requestSize.height(), qRound(sz.height() * 1.5)));
+
+            // wasting too much space?
+            if (sz.width() * sz.height() > requestSize.width() * requestSize.height() * 2.5)
+                sz = requestSize;
+
+            if (sz != fboSize) {
+                delete candidate;
+                qDebug() << "Resizing fbo in pool:" << sz;
+                candidate = new QGLFramebufferObject(sz, requestFormat);
+            }
+
+            chosen = candidate;
+        }
+    }
+
+    if (!chosen) {
+        qDebug() << "Creating new fbo in pool:" << requestSize;
+        chosen = new QGLFramebufferObject(requestSize, requestFormat);
+    }
+
+    if (!chosen->isValid()) {
+        delete chosen;
+        chosen = 0;
+    }
+
+    return chosen;
+}
+
+void QGLFramebufferObjectPool::release(QGLFramebufferObject *fbo)
+{
+    m_fbos << fbo;
+}
+
 class QGLShareContextScope
 {
 public:
@@ -112,6 +191,8 @@ QGLPixmapData::~QGLPixmapData()
     if (!shareWidget)
         return;
 
+    delete m_engine;
+
     if (m_texture.id) {
         QGLShareContextScope ctx(shareWidget->context());
         glDeleteTextures(1, &m_texture.id);
@@ -332,8 +413,11 @@ struct TextureBuffer
     QGL2PaintEngineEx *engine;
 };
 
-static QVector<TextureBuffer> textureBufferStack;
-static int currentTextureBuffer = 0;
+Q_GLOBAL_STATIC(QGLFramebufferObjectPool, _qgl_fbo_pool)
+QGLFramebufferObjectPool* qgl_fbo_pool()
+{
+    return _qgl_fbo_pool();
+}
 
 void QGLPixmapData::copyBackFromRenderFbo(bool keepCurrentFboBound) const
 {
@@ -380,10 +464,9 @@ void QGLPixmapData::swapBuffers()
     copyBackFromRenderFbo(false);
     m_renderFbo->release();
 
-    --currentTextureBuffer;
+    qgl_fbo_pool()->release(m_renderFbo);
 
     m_renderFbo = 0;
-    m_engine = 0;
 }
 
 void QGLPixmapData::makeCurrent()
@@ -398,19 +481,6 @@ void QGLPixmapData::doneCurrent()
         m_renderFbo->release();
 }
 
-static TextureBuffer createTextureBuffer(const QSize &size, QGL2PaintEngineEx *engine = 0)
-{
-    TextureBuffer buffer;
-    QGLFramebufferObjectFormat fmt;
-    fmt.setAttachment(QGLFramebufferObject::CombinedDepthStencil);
-    fmt.setSamples(4);
-
-    buffer.fbo = new QGLFramebufferObject(size, fmt);
-    buffer.engine = engine ? engine : new QGL2PaintEngineEx;
-
-    return buffer;
-}
-
 bool QGLPixmapData::useFramebufferObjects()
 {
     return QGLFramebufferObject::hasOpenGLFramebufferObjects()
@@ -423,7 +493,7 @@ QPaintEngine* QGLPixmapData::paintEngine() const
     if (!isValid())
         return 0;
 
-    if (m_engine)
+    if (m_renderFbo)
         return m_engine;
 
     if (useFramebufferObjects()) {
@@ -433,33 +503,16 @@ QPaintEngine* QGLPixmapData::paintEngine() const
             qt_gl_share_widget()->makeCurrent();
         QGLShareContextScope ctx(qt_gl_share_widget()->context());
 
-        if (textureBufferStack.size() <= currentTextureBuffer) {
-            textureBufferStack << createTextureBuffer(size());
-        } else {
-            QSize sz = textureBufferStack.at(currentTextureBuffer).fbo->size();
-            if (sz.width() < w || sz.height() < h) {
-                if (sz.width() < w)
-                    sz.setWidth(qMax(w, qRound(sz.width() * 1.5)));
-                if (sz.height() < h)
-                    sz.setHeight(qMax(h, qRound(sz.height() * 1.5)));
-
-                // wasting too much space?
-                if (sz.width() * sz.height() > w * h * 2.5)
-                    sz = QSize(w, h);
-
-                delete textureBufferStack.at(currentTextureBuffer).fbo;
-                textureBufferStack[currentTextureBuffer] =
-                    createTextureBuffer(sz, textureBufferStack.at(currentTextureBuffer).engine);
-                qDebug() << "Creating new pixmap texture buffer:" << sz;
-            }
-        }
-
-        if (textureBufferStack.at(currentTextureBuffer).fbo->isValid()) {
-            m_renderFbo = textureBufferStack.at(currentTextureBuffer).fbo;
-            m_engine = textureBufferStack.at(currentTextureBuffer).engine;
+        QGLFramebufferObjectFormat format;
+        format.setAttachment(QGLFramebufferObject::CombinedDepthStencil);
+        format.setSamples(4);
+        format.setInternalFormat(m_hasAlpha ? GL_RGBA : GL_RGB);
 
-            ++currentTextureBuffer;
+        m_renderFbo = qgl_fbo_pool()->acquire(size(), format);
 
+        if (m_renderFbo) {
+            if (!m_engine)
+                m_engine = new QGL2PaintEngineEx;
             return m_engine;
         }
 
diff --git a/src/opengl/qpixmapdata_gl_p.h b/src/opengl/qpixmapdata_gl_p.h
index 7a5e197..236dcae 100644
--- a/src/opengl/qpixmapdata_gl_p.h
+++ b/src/opengl/qpixmapdata_gl_p.h
@@ -62,6 +62,19 @@ QT_BEGIN_NAMESPACE
 
 class QPaintEngine;
 class QGLFramebufferObject;
+class QGLFramebufferObjectFormat;
+
+class QGLFramebufferObjectPool
+{
+public:
+    QGLFramebufferObject *acquire(const QSize &size, const QGLFramebufferObjectFormat &format);
+    void release(QGLFramebufferObject *fbo);
+
+private:
+    QList<QGLFramebufferObject *> m_fbos;
+};
+
+QGLFramebufferObjectPool* qgl_fbo_pool();
 
 class QGLPixmapData : public QPixmapData
 {