Re-write the shader manager & completely break everything ;-)

7 files changed, 758 insertions, 750 deletions

diff --git a/src/opengl/gl2paintengineex/glgc_shader_source.h b/src/opengl/gl2paintengineex/glgc_shader_source.h
index 47a1cbb..5184c78 100644
--- a/src/opengl/gl2paintengineex/glgc_shader_source.h
+++ b/src/opengl/gl2paintengineex/glgc_shader_source.h
@@ -49,143 +49,6 @@ QT_BEGIN_NAMESPACE
 QT_MODULE(OpenGL)
 
 
-/*
-    VERTEX SHADERS
-    ==============
-
-    Vertex shaders are specified as multiple (partial) shaders. On desktop,
-    this works fine. On ES, QGLShader & QGLShaderProgram will make partial
-    shaders work by concatenating the source in each QGLShader and compiling
-    it as a single shader. This is abstracted nicely by QGLShaderProgram and
-    the GL2 engine doesn't need to worry about it.
-
-    Generally, there's two vertex shader objects. The position shaders are
-    the ones which set gl_Position. There's also two "main" vertex shaders,
-    one which just calls the position shader and another which also passes
-    through some texture coordinates from a vertex attribute array to a
-    varying. These texture coordinates are used for mask position in text
-    rendering and for the source coordinates in drawImage/drawPixmap. There's
-    also a "Simple" vertex shader for rendering a solid colour (used to render
-    into the stencil buffer where the actual colour value is discarded).
-
-    The position shaders for brushes look scary. This is because many of the
-    calculations which logically belong in the fragment shader have been moved
-    into the vertex shader to improve performance. This is why the position
-    calculation is in a seperate shader. Not only does it calculate the
-    position, but it also calculates some data to be passed to the fragment
-    shader as a varying. It is optimal to move as much of the calculation as
-    possible into the vertex shader as this is executed less often.
-
-    The varyings passed to the fragment shaders are interpolated (which is
-    cheap). Unfortunately, GL will apply perspective correction to the
-    interpolation calusing errors. To get around this, the vertex shader must
-    apply perspective correction itself and set the w-value of gl_Position to
-    zero. That way, GL will be tricked into thinking it doesn't need to apply a
-    perspective correction and use linear interpolation instead (which is what
-    we want). Of course, if the brush transform is affeine, no perspective
-    correction is needed and a simpler vertex shader can be used instead.
-
-    So there are the following "main" vertex shaders:
-        qglslSimpleVertexShader
-        qglslMainVertexShader
-        qglslMainWithTexCoordsVertexShader
-
-    And the the following position vertex shaders:
-        qglslPositionOnlyVertexShader
-        qglslPositionWithTextureBrushVertexShader
-        qglslPositionWithPatternBrushVertexShader
-        qglslPositionWithLinearGradientBrushVertexShader
-        qglslPositionWithRadialGradientBrushVertexShader
-        qglslPositionWithConicalGradientBrushVertexShader
-        qglslAffinePositionWithTextureBrushVertexShader
-        qglslAffinePositionWithPatternBrushVertexShader
-        qglslAffinePositionWithLinearGradientBrushVertexShader
-        qglslAffinePositionWithRadialGradientBrushVertexShader
-        qglslAffinePositionWithConicalGradientBrushVertexShader
-
-    Leading to 23 possible vertex shaders
-
-
-    FRAGMENT SHADERS
-    ================
-
-    Fragment shaders are also specified as multiple (partial) shaders. The
-    different fragment shaders represent the different stages in Qt's fragment
-    pipeline. There are 1-3 stages in this pipeline: First stage is to get the
-    fragment's colour value. The next stage is to get the fragment's mask value
-    (coverage value for anti-aliasing) and the final stage is to blend the
-    incoming fragment with the background (for composition modes not supported
-    by GL).
-
-    Of these, the first stage will always be present. If Qt doesn't need to
-    apply anti-aliasing (because it's off or handled by multisampling) then
-    the coverage value doesn't need to be applied. (Note: There are two types
-    of mask, one for regular anti-aliasing and one for sub-pixel anti-
-    aliasing.) If the composition mode is one which GL supports natively then
-    the blending stage doesn't need to be applied.
-
-    As eash stage can have multiple implementations, they are abstracted as
-    GLSL function calls, with the following signatures:
-
-    Brushes & image drawing are implementations of "mediump vec4 srcPixel()":
-        qglslImageFragmentShader
-        qglslNonPremultipliedImageFragmentShader
-        qglslSolidBrushFragmentShader
-        qglslTextureBrushFragmentShader
-        qglslPatternBrushFragmentShader
-        qglslLinearGradientBrushFragmentShader
-        qglslRadialGradientBrushFragmentShader
-        qglslConicalGradientBrushFragmentShader
-
-    NOTE: It is assumed the colour returned by srcPixel() is pre-multiplied
-
-    The two masks are have these signature and are called:
-        qglslMaskFragmentShader: "mediump float mask()"
-        qglslRgbMaskFragmentShader: "mediump vec3 rgbMask()"
-
-    Composition modes are "mediump vec4 composite(mediump vec4 src, mediump vec4 dest)":
-        qglslColorBurnCompositionModeFragmentShader
-        qglslColorDodgeCompositionModeFragmentShader
-        qglslDarkenCompositionModeFragmentShader
-        qglslDifferenceCompositionModeFragmentShader
-        qglslExclusionCompositionModeFragmentShader
-        qglslHardLightCompositionModeFragmentShader
-        qglslLightenCompositionModeFragmentShader
-        qglslMultiplyCompositionModeFragmentShader
-        qglslOverlayCompositionModeFragmentShader
-        qglslScreenCompositionModeFragmentShader
-        qglslSoftLightCompositionModeFragmentShader
-
-
-    So there are differnt frament shader main functions, depending on the
-    number & type of pipelines the fragment needs to go through.
-
-    The choice of which main() fragment shader string to use depends on:
-        - Use of global opacity
-        - Brush style (some brushes apply opacity themselves)
-        - Use & type of mask (TODO: Need to support high quality anti-aliasing & text)
-        - Use of gamma-correction
-        - Use of non-GL Composition mode
-
-
-    CUSTOM SHADER CODE (idea)
-    ==================
-
-    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:
-
-        mediump vec4 customShader(sampler2d src, vec2 srcCoords)
-        mediump vec4 customShaderWithDest(sampler2d dest, sampler2d src, vec2 srcCoords)
-
-*/
-
-/////////////////////////////////////////////////////////////////////
-
-
 static const char* qglslImageVertexShader = "\
     attribute highp vec4    inputVertex; \
     attribute lowp  vec2    textureCoord; \
diff --git a/src/opengl/gl2paintengineex/qglengineshadermanager.cpp b/src/opengl/gl2paintengineex/qglengineshadermanager.cpp
new file mode 100644
index 0000000..1086430
--- /dev/null
+++ b/src/opengl/gl2paintengineex/qglengineshadermanager.cpp
@@ -0,0 +1,367 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qglengineshadermanager_p.h"
+
+#if defined(QT_DEBUG)
+#include <QMetaEnum>
+#endif
+
+
+QGLEngineShaderManager::QGLEngineShaderManager(QGLContext* context)
+    : ctx(context),
+      shaderProgNeedsChanging(true),
+      srcPixelType(Qt::NoBrush),
+      useGlobalOpacity(false),
+      maskType(NoMask),
+      useTextureCoords(false),
+      compositionMode(QPainter::CompositionMode_SourceOver),
+      simpleShaderProg(0),
+      currentShaderProg(0)
+{
+    memset(compiledShaders, 0, sizeof(compiledShaders));
+}
+
+QGLEngineShaderManager::~QGLEngineShaderManager()
+{
+    //###
+}
+
+
+
+
+
+void QGLEngineShaderManager::optimiseForBrushTransform(const QTransform transform)
+{
+    Q_UNUSED(transform); // Currently ignored
+}
+
+void QGLEngineShaderManager::setSrcPixelType(Qt::BrushStyle style)
+{
+    srcPixelType = style;
+    shaderProgNeedsChanging = true; //###
+}
+
+void QGLEngineShaderManager::setSrcPixelType(PixelSrcType type)
+{
+    srcPixelType = type;
+    shaderProgNeedsChanging = true; //###
+}
+
+void QGLEngineShaderManager::setTextureCoordsEnabled(bool enabled)
+{
+    useTextureCoords = enabled;
+    shaderProgNeedsChanging = true; //###
+}
+
+void QGLEngineShaderManager::setUseGlobalOpacity(bool useOpacity)
+{
+    useGlobalOpacity = useOpacity;
+    shaderProgNeedsChanging = true; //###
+}
+
+void QGLEngineShaderManager::setMaskType(MaskType type)
+{
+    maskType = type;
+    shaderProgNeedsChanging = true; //###
+}
+
+void QGLEngineShaderManager::setCompositionMode(QPainter::CompositionMode mode)
+{
+    compositionMode = mode;
+    shaderProgNeedsChanging = true; //###
+}
+
+bool QGLEngineShaderManager::shaderProgramDirty()
+{
+    return shaderProgNeedsChanging;
+}
+
+QGLShaderProgram* QGLEngineShaderManager::currentProgram()
+{
+    return currentShaderProg;
+}
+
+QGLShaderProgram* QGLEngineShaderManager::simpleProgram()
+{
+    return simpleShaderProg;
+}
+
+
+
+
+// Select & use the correct shader program using the current state
+void QGLEngineShaderManager::useCorrectShaderProg()
+{
+    QGLEngineShaderProg requiredProgram;
+
+    // Choose vertex shader main function
+    QGLEngineShaderManager::ShaderName mainVertexShaderName = InvalidShaderName;
+    if (useTextureCoords)
+        mainVertexShaderName = MainWithTexCoordsVertexShader;
+    else
+        mainVertexShaderName = MainVertexShader;
+    compileNamedShader(mainVertexShaderName, QGLShader::PartialVertexShader);
+    requiredProgram.mainVertexShader = compiledShaders[mainVertexShaderName];
+
+    // Choose vertex shader shader position function (which typically also sets
+    // varyings) and the source pixel (srcPixel) fragment shader function:
+    QGLEngineShaderManager::ShaderName positionVertexShaderName = InvalidShaderName;
+    QGLEngineShaderManager::ShaderName srcPixelFragShaderName = InvalidShaderName;
+    bool isAffine = transform.isAffine();
+    if ( (srcPixelType >= Qt::Dense1Pattern) && (srcPixelType <= Qt::DiagCrossPattern) ) {
+        if (isAffine)
+            positionVertexShaderName = AffinePositionWithPatternBrushVertexShader;
+        else
+            positionVertexShaderName = PositionWithPatternBrushVertexShader;
+
+        srcPixelFragShaderName = PatternBrushSrcFragmentShader;
+    }
+    else switch (srcPixelType) {
+        default:
+        case Qt::NoBrush:
+            qCritical("QGLEngineShaderManager::useCorrectShaderProg() - I'm scared, Qt::NoBrush style is set");
+            break;
+        case QGLEngineShaderManager::ImageSrc:
+            srcPixelFragShaderName = ImageSrcFragmentShader;
+            positionVertexShaderName = PositionOnlyVertexShader;
+            break;
+        case QGLEngineShaderManager::NonPremultipliedImageSrc:
+            srcPixelFragShaderName = NonPremultipliedImageSrcFragmentShader;
+            positionVertexShaderName = PositionOnlyVertexShader;
+            break;
+        case Qt::SolidPattern:
+            srcPixelFragShaderName = SolidBrushSrcFragmentShader;
+            positionVertexShaderName = PositionOnlyVertexShader;
+            break;
+        case Qt::LinearGradientPattern:
+            srcPixelFragShaderName = LinearGradientBrushSrcFragmentShader;
+            positionVertexShaderName = isAffine ? AffinePositionWithLinearGradientBrushVertexShader
+                                                : PositionWithLinearGradientBrushVertexShader;
+            break;
+        case Qt::ConicalGradientPattern:
+            srcPixelFragShaderName = ConicalGradientBrushSrcFragmentShader;
+            positionVertexShaderName = isAffine ? AffinePositionWithConicalGradientBrushVertexShader
+                                                : PositionWithConicalGradientBrushVertexShader;
+            break;
+        case Qt::RadialGradientPattern:
+            srcPixelFragShaderName = RadialGradientBrushSrcFragmentShader;
+            positionVertexShaderName = isAffine ? AffinePositionWithRadialGradientBrushVertexShader
+                                                : PositionWithRadialGradientBrushVertexShader;
+            break;
+        case Qt::TexturePattern:
+            srcPixelFragShaderName = TextureBrushSrcFragmentShader;
+            positionVertexShaderName = isAffine ? AffinePositionWithTextureBrushVertexShader
+                                                : PositionWithTextureBrushVertexShader;
+            break;
+    };
+    compileNamedShader(positionVertexShaderName, QGLShader::PartialVertexShader);
+    compileNamedShader(srcPixelFragShaderName, QGLShader::PartialFragmentShader);
+    requiredProgram.positionVertexShader = compiledShaders[positionVertexShaderName];
+    requiredProgram.srcPixelFragShader = compiledShaders[srcPixelFragShaderName];
+
+
+    const bool hasCompose = compositionMode > QPainter::CompositionMode_Plus;
+    const bool hasMask = maskType != QGLEngineShaderManager::NoMask;
+
+    // Choose fragment shader main function:
+    QGLEngineShaderManager::ShaderName mainFragShaderName;
+
+    if (hasCompose && hasMask && useGlobalOpacity)
+        mainFragShaderName = MainFragmentShader_CMO;
+    if (hasCompose && hasMask && !useGlobalOpacity)
+        mainFragShaderName = MainFragmentShader_CM;
+    if (!hasCompose && hasMask && useGlobalOpacity)
+        mainFragShaderName = MainFragmentShader_MO;
+    if (!hasCompose && hasMask && !useGlobalOpacity)
+        mainFragShaderName = MainFragmentShader_M;
+    if (hasCompose && !hasMask && useGlobalOpacity)
+        mainFragShaderName = MainFragmentShader_CO;
+    if (hasCompose && !hasMask && !useGlobalOpacity)
+        mainFragShaderName = MainFragmentShader_C;
+    if (!hasCompose && !hasMask && useGlobalOpacity)
+        mainFragShaderName = MainFragmentShader_O;
+    if (!hasCompose && !hasMask && !useGlobalOpacity)
+        mainFragShaderName = MainFragmentShader;
+
+    compileNamedShader(mainFragShaderName, QGLShader::PartialFragmentShader);
+    requiredProgram.mainFragShader = compiledShaders[mainFragShaderName];
+
+    if (hasMask) {
+        QGLEngineShaderManager::ShaderName maskShaderName = QGLEngineShaderManager::InvalidShaderName;
+        if (maskType == PixelMask)
+            maskShaderName = MaskFragmentShader;
+        else if (maskType == SubPixelMask)
+            maskShaderName = RgbMaskFragmentShader;
+        else if (maskType == SubPixelWithGammaMask)
+            maskShaderName = RgbMaskWithGammaFragmentShader;
+        else
+            qCritical("QGLEngineShaderManager::useCorrectShaderProg() - Unknown mask type");
+
+        compileNamedShader(maskShaderName, QGLShader::PartialFragmentShader);
+        requiredProgram.maskFragShader = compiledShaders[maskShaderName];
+    }
+    else
+        requiredProgram.maskFragShader = 0;
+
+    if (hasCompose) {
+        QGLEngineShaderManager::ShaderName compositionShaderName = QGLEngineShaderManager::InvalidShaderName;
+        switch (compositionMode) {
+            case QPainter::CompositionMode_Multiply:
+                compositionShaderName = MultiplyCompositionModeFragmentShader;
+                break;
+            case QPainter::CompositionMode_Screen:
+                compositionShaderName = ScreenCompositionModeFragmentShader;
+                break;
+            case QPainter::CompositionMode_Overlay:
+                compositionShaderName = OverlayCompositionModeFragmentShader;
+                break;
+            case QPainter::CompositionMode_Darken:
+                compositionShaderName = DarkenCompositionModeFragmentShader;
+                break;
+            case QPainter::CompositionMode_Lighten:
+                compositionShaderName = LightenCompositionModeFragmentShader;
+                break;
+            case QPainter::CompositionMode_ColorDodge:
+                compositionShaderName = ColorDodgeCompositionModeFragmentShader;
+                break;
+            case QPainter::CompositionMode_ColorBurn:
+                compositionShaderName = ColorBurnCompositionModeFragmentShader;
+                break;
+            case QPainter::CompositionMode_HardLight:
+                compositionShaderName = HardLightCompositionModeFragmentShader;
+                break;
+            case QPainter::CompositionMode_SoftLight:
+                compositionShaderName = SoftLightCompositionModeFragmentShader;
+                break;
+            case QPainter::CompositionMode_Difference:
+                compositionShaderName = DifferenceCompositionModeFragmentShader;
+                break;
+            case QPainter::CompositionMode_Exclusion:
+                compositionShaderName = ExclusionCompositionModeFragmentShader;
+                break;
+            default:
+                qWarning("QGLEngineShaderManager::useCorrectShaderProg() - Unsupported composition mode");
+        }
+        compileNamedShader(compositionShaderName, QGLShader::PartialFragmentShader);
+        requiredProgram.compositionFragShader = compiledShaders[compositionShaderName];
+    }
+    else
+        requiredProgram.compositionFragShader = 0;
+
+
+    // At this point, requiredProgram is fully populated so try to find the program in the cache
+    foreach (const QGLEngineShaderProg &prog, cachedPrograms) {
+        if (    (prog.mainVertexShader == requiredProgram.mainVertexShader)
+             && (prog.positionVertexShader == requiredProgram.positionVertexShader)
+             && (prog.mainFragShader == requiredProgram.mainFragShader)
+             && (prog.srcPixelFragShader == requiredProgram.srcPixelFragShader)
+             && (prog.compositionFragShader == requiredProgram.compositionFragShader) )
+        {
+            currentShaderProg = requiredProgram.program;
+            currentShaderProg->enable();
+            shaderProgNeedsChanging = false;
+            return;
+        }
+    }
+
+/*
+    QGLShader*          mainVertexShader;
+    QGLShader*          positionVertexShader;
+    QGLShader*          mainFragShader;
+    QGLShader*          srcPixelFragShader;
+    QGLShader*          maskFragShader;        // Can be null for no mask
+    QGLShader*          compositionFragShader; // Can be null for GL-handled mode
+    QGLShaderProgram*   program;
+*/
+    // 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);
+    requiredProgram.program->link();
+    if (!requiredProgram.program->isValid()) {
+        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'
+#endif
+              << "  Error Log:" << '\n'
+              << "    " << requiredProgram.program->errors();
+        qWarning() << error;
+    }
+    else {
+        cachedPrograms.append(requiredProgram);
+        currentShaderProg = requiredProgram.program;
+        currentShaderProg->enable();
+    }
+    shaderProgNeedsChanging = false;
+}
+
+void QGLEngineShaderManager::compileNamedShader(QGLEngineShaderManager::ShaderName name, QGLShader::ShaderType type)
+{
+    if (compiledShaders[name])
+        return;
+
+    QGLShader *newShader = new QGLShader(type, ctx, this);
+    newShader->setSourceCode(qglEngineShaderSourceCode[name]);
+    // newShader->compile(); ### does not exist?
+
+#if defined(QT_DEBUG)
+    // Name the shader for easier debugging
+    QMetaEnum m = staticMetaObject.enumerator(staticMetaObject.indexOfEnumerator("ShaderName"));
+    newShader->setObjectName(QLatin1String(m.valueToKey(name)));
+#endif
+
+    compiledShaders[name] = newShader;
+}
+
+
diff --git a/src/opengl/gl2paintengineex/qglengineshadermanager_p.h b/src/opengl/gl2paintengineex/qglengineshadermanager_p.h
new file mode 100644
index 0000000..fe30a70
--- /dev/null
+++ b/src/opengl/gl2paintengineex/qglengineshadermanager_p.h
@@ -0,0 +1,385 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//
+//  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.
+//
+
+/*
+    VERTEX SHADERS
+    ==============
+
+    Vertex shaders are specified as multiple (partial) shaders. On desktop,
+    this works fine. On ES, QGLShader & QGLShaderProgram will make partial
+    shaders work by concatenating the source in each QGLShader and compiling
+    it as a single shader. This is abstracted nicely by QGLShaderProgram and
+    the GL2 engine doesn't need to worry about it.
+
+    Generally, there's two vertex shader objects. The position shaders are
+    the ones which set gl_Position. There's also two "main" vertex shaders,
+    one which just calls the position shader and another which also passes
+    through some texture coordinates from a vertex attribute array to a
+    varying. These texture coordinates are used for mask position in text
+    rendering and for the source coordinates in drawImage/drawPixmap. There's
+    also a "Simple" vertex shader for rendering a solid colour (used to render
+    into the stencil buffer where the actual colour value is discarded).
+
+    The position shaders for brushes look scary. This is because many of the
+    calculations which logically belong in the fragment shader have been moved
+    into the vertex shader to improve performance. This is why the position
+    calculation is in a seperate shader. Not only does it calculate the
+    position, but it also calculates some data to be passed to the fragment
+    shader as a varying. It is optimal to move as much of the calculation as
+    possible into the vertex shader as this is executed less often.
+
+    The varyings passed to the fragment shaders are interpolated (which is
+    cheap). Unfortunately, GL will apply perspective correction to the
+    interpolation calusing errors. To get around this, the vertex shader must
+    apply perspective correction itself and set the w-value of gl_Position to
+    zero. That way, GL will be tricked into thinking it doesn't need to apply a
+    perspective correction and use linear interpolation instead (which is what
+    we want). Of course, if the brush transform is affeine, no perspective
+    correction is needed and a simpler vertex shader can be used instead.
+
+    So there are the following "main" vertex shaders:
+        qglslSimpleVertexShader
+        qglslMainVertexShader
+        qglslMainWithTexCoordsVertexShader
+
+    And the the following position vertex shaders:
+        qglslPositionOnlyVertexShader
+        qglslPositionWithTextureBrushVertexShader
+        qglslPositionWithPatternBrushVertexShader
+        qglslPositionWithLinearGradientBrushVertexShader
+        qglslPositionWithRadialGradientBrushVertexShader
+        qglslPositionWithConicalGradientBrushVertexShader
+        qglslAffinePositionWithTextureBrushVertexShader
+        qglslAffinePositionWithPatternBrushVertexShader
+        qglslAffinePositionWithLinearGradientBrushVertexShader
+        qglslAffinePositionWithRadialGradientBrushVertexShader
+        qglslAffinePositionWithConicalGradientBrushVertexShader
+
+    Leading to 23 possible vertex shaders
+
+
+    FRAGMENT SHADERS
+    ================
+
+    Fragment shaders are also specified as multiple (partial) shaders. The
+    different fragment shaders represent the different stages in Qt's fragment
+    pipeline. There are 1-3 stages in this pipeline: First stage is to get the
+    fragment's colour value. The next stage is to get the fragment's mask value
+    (coverage value for anti-aliasing) and the final stage is to blend the
+    incoming fragment with the background (for composition modes not supported
+    by GL).
+
+    Of these, the first stage will always be present. If Qt doesn't need to
+    apply anti-aliasing (because it's off or handled by multisampling) then
+    the coverage value doesn't need to be applied. (Note: There are two types
+    of mask, one for regular anti-aliasing and one for sub-pixel anti-
+    aliasing.) If the composition mode is one which GL supports natively then
+    the blending stage doesn't need to be applied.
+
+    As eash stage can have multiple implementations, they are abstracted as
+    GLSL function calls with the following signatures:
+
+    Brushes & image drawing are implementations of "qcolorp vec4 srcPixel()":
+        qglslImageSrcFragShader
+        qglslNonPremultipliedImageSrcFragShader
+        qglslSolidBrushSrcFragShader
+        qglslTextureBrushSrcFragShader
+        qglslPatternBrushSrcFragShader
+        qglslLinearGradientBrushSrcFragShader
+        qglslRadialGradientBrushSrcFragShader
+        qglslConicalGradientBrushSrcFragShader
+    NOTE: It is assumed the colour returned by srcPixel() is pre-multiplied
+
+    Masks are implementations of "qcolorp vec4 applyMask(qcolorp vec4 src)":
+        qglslMaskFragmentShader
+        qglslRgbMaskFragmentShader
+        qglslRgbMaskWithGammaFragmentShader
+
+    Composition modes are "qcolorp vec4 compose(qcolorp vec4 src)":
+        qglslColorBurnCompositionModeFragmentShader
+        qglslColorDodgeCompositionModeFragmentShader
+        qglslDarkenCompositionModeFragmentShader
+        qglslDifferenceCompositionModeFragmentShader
+        qglslExclusionCompositionModeFragmentShader
+        qglslHardLightCompositionModeFragmentShader
+        qglslLightenCompositionModeFragmentShader
+        qglslMultiplyCompositionModeFragmentShader
+        qglslOverlayCompositionModeFragmentShader
+        qglslScreenCompositionModeFragmentShader
+        qglslSoftLightCompositionModeFragmentShader
+
+
+    Note: In the future, some GLSL compilers will support an extension allowing
+          a new 'color' precision specifier. To support this, qcolorp is used for
+          all color components so it can be defined to colorp or lowp depending upon
+          the implementation.
+
+    So there are differnt frament shader main functions, depending on the
+    number & type of pipelines the fragment needs to go through.
+
+    The choice of which main() fragment shader string to use depends on:
+        - Use of global opacity
+        - Brush style (some brushes apply opacity themselves)
+        - Use & type of mask (TODO: Need to support high quality anti-aliasing & text)
+        - Use of non-GL Composition mode
+
+    Leading to the following fragment shader main functions:
+        gl_FragColor = compose(applyMask(srcPixel()*globalOpacity));
+        gl_FragColor = compose(applyMask(srcPixel()));
+        gl_FragColor = applyMask(srcPixel()*globalOpacity);
+        gl_FragColor = applyMask(srcPixel());
+        gl_FragColor = compose(srcPixel()*globalOpacity);
+        gl_FragColor = compose(srcPixel());
+        gl_FragColor = srcPixel()*globalOpacity;
+        gl_FragColor = srcPixel();
+
+    Called:
+        qglslMainFragmentShader_CMO
+        qglslMainFragmentShader_CM
+        qglslMainFragmentShader_MO
+        qglslMainFragmentShader_M
+        qglslMainFragmentShader_CO
+        qglslMainFragmentShader_C
+        qglslMainFragmentShader_O
+        qglslMainFragmentShader
+
+    Where:
+        M = Mask
+        C = Composition
+        O = Global Opacity
+
+
+    CUSTOM SHADER CODE (idea, depricated)
+    ==================
+
+    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:
+
+        mediump vec4 customShader(sampler2d src, vec2 srcCoords)
+        mediump vec4 customShaderWithDest(sampler2d dest, sampler2d src, vec2 srcCoords)
+
+*/
+
+#ifndef QGLENGINE_SHADER_MANAGER_H
+#define QGLENGINE_SHADER_MANAGER_H
+
+#include <QGLShader>
+#include <QGLShaderProgram>
+#include <QPainter>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(OpenGL)
+
+
+struct QGLEngineShaderProg
+{
+    QGLShader*          mainVertexShader;
+    QGLShader*          positionVertexShader;
+    QGLShader*          mainFragShader;
+    QGLShader*          srcPixelFragShader;
+    QGLShader*          maskFragShader;        // Can be null for no mask
+    QGLShader*          compositionFragShader; // Can be null for GL-handled mode
+    QGLShaderProgram*   program;
+};
+
+/*
+struct QGLEngineCachedShaderProg
+{
+    QGLEngineCachedShaderProg(QGLEngineShaderManager::ShaderName vertexMain,
+                              QGLEngineShaderManager::ShaderName vertexPosition,
+                              QGLEngineShaderManager::ShaderName fragMain,
+                              QGLEngineShaderManager::ShaderName pixelSrc,
+                              QGLEngineShaderManager::ShaderName mask,
+                              QGLEngineShaderManager::ShaderName composition);
+
+    int cacheKey;
+    QGLShaderProgram* program;
+}
+*/
+
+class QGLEngineShaderManager : public QObject
+{
+    Q_OBJECT;
+public:
+    QGLEngineShaderManager(QGLContext* context);
+    ~QGLEngineShaderManager();
+
+    enum MaskType {NoMask, PixelMask, SubPixelMask, SubPixelWithGammaMask};
+    enum PixelSrcType {
+        ImageSrc = Qt::TexturePattern+1,
+        NonPremultipliedImageSrc = Qt::TexturePattern+2
+    };
+
+    // There are optimisations we can do, depending on the transform:
+    //    1) May not have to apply perspective-correction
+    //    2) Can use lower precision for vertecies
+    void optimiseForBrushTransform(const QTransform transform);
+    void setSrcPixelType(Qt::BrushStyle);
+    void setSrcPixelType(PixelSrcType); // For non-brush sources, like pixmaps & images
+    void setTextureCoordsEnabled(bool); // For images & text glyphs
+    void setUseGlobalOpacity(bool);
+    void setMaskType(MaskType);
+    void setCompositionMode(QPainter::CompositionMode);
+
+    bool shaderProgramDirty(); // returns true if the shader program needs to be changed
+    void useCorrectShaderProg();
+
+    QGLShaderProgram* currentProgram(); // Returns pointer to the shader the manager has chosen
+    QGLShaderProgram* simpleProgram(); // Used to draw into e.g. stencil buffers
+
+    enum ShaderName {
+        SimpleVertexShader,
+        MainVertexShader,
+        MainWithTexCoordsVertexShader,
+
+        PositionOnlyVertexShader,
+        PositionWithPatternBrushVertexShader,
+        PositionWithLinearGradientBrushVertexShader,
+        PositionWithConicalGradientBrushVertexShader,
+        PositionWithRadialGradientBrushVertexShader,
+        PositionWithTextureBrushVertexShader,
+        AffinePositionWithPatternBrushVertexShader,
+        AffinePositionWithLinearGradientBrushVertexShader,
+        AffinePositionWithConicalGradientBrushVertexShader,
+        AffinePositionWithRadialGradientBrushVertexShader,
+        AffinePositionWithTextureBrushVertexShader,
+
+        MainFragmentShader_CMO,
+        MainFragmentShader_CM,
+        MainFragmentShader_MO,
+        MainFragmentShader_M,
+        MainFragmentShader_CO,
+        MainFragmentShader_C,
+        MainFragmentShader_O,
+        MainFragmentShader,
+
+        ImageSrcFragmentShader,
+        NonPremultipliedImageSrcFragmentShader,
+        SolidBrushSrcFragmentShader,
+        TextureBrushSrcFragmentShader,
+        PatternBrushSrcFragmentShader,
+        LinearGradientBrushSrcFragmentShader,
+        RadialGradientBrushSrcFragmentShader,
+        ConicalGradientBrushSrcFragmentShader,
+
+        MaskFragmentShader,
+        RgbMaskFragmentShader,
+        RgbMaskWithGammaFragmentShader,
+
+        MultiplyCompositionModeFragmentShader,
+        ScreenCompositionModeFragmentShader,
+        OverlayCompositionModeFragmentShader,
+        DarkenCompositionModeFragmentShader,
+        LightenCompositionModeFragmentShader,
+        ColorDodgeCompositionModeFragmentShader,
+        ColorBurnCompositionModeFragmentShader,
+        HardLightCompositionModeFragmentShader,
+        SoftLightCompositionModeFragmentShader,
+        DifferenceCompositionModeFragmentShader,
+        ExclusionCompositionModeFragmentShader,
+
+        TotalShaderCount, InvalidShaderName
+    };
+
+/*
+    // These allow the ShaderName enum to be used as a cache key
+    const int mainVertexOffset = 0;
+    const int positionVertexOffset = (1<<2) - PositionOnlyVertexShader;
+    const int mainFragOffset = (1<<6) - MainFragmentShader_CMO;
+    const int srcPixelOffset = (1<<10) - ImageSrcFragmentShader;
+    const int maskOffset = (1<<14) - NoMaskShader;
+    const int compositionOffset = (1 << 16) - MultiplyCompositionModeFragmentShader;
+*/
+
+#if defined (QT_DEBUG)
+    Q_ENUMS(ShaderName);
+#else
+#error Release build not supported yet
+#endif
+
+
+private:
+    QGLContext*     ctx;
+    bool            shaderProgNeedsChanging;
+
+    // Current state variables which influence the choice of shader:
+    QTransform                  transform;
+    int                         srcPixelType;
+    bool                        useGlobalOpacity;
+    MaskType                    maskType;
+    bool                        useTextureCoords;
+    QPainter::CompositionMode   compositionMode;
+
+    QGLShaderProgram*   simpleShaderProg;
+    QGLShaderProgram*   currentShaderProg;
+
+    // TODO: Possibly convert to a LUT
+    QList<QGLEngineShaderProg> cachedPrograms;
+
+    QGLShader* compiledShaders[TotalShaderCount];
+
+    void compileNamedShader(QGLEngineShaderManager::ShaderName name, QGLShader::ShaderType type);
+};
+
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif //QGLENGINE_SHADER_MANAGER_H
diff --git a/src/opengl/gl2paintengineex/qglpexshadermanager.cpp b/src/opengl/gl2paintengineex/qglpexshadermanager.cpp
deleted file mode 100644
index e460e08..0000000
--- a/src/opengl/gl2paintengineex/qglpexshadermanager.cpp
+++ /dev/null
@@ -1,450 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
-** Contact: Qt Software Information (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 qt-sales@nokia.com.
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#include "qglpexshadermanager_p.h"
-
-#include "glgc_shader_source.h"
-
-QGLPEXShaderManager::QGLPEXShaderManager(const QGLContext* context)
-{
-    ctx = const_cast<QGLContext*>(context);
-
-    defaultVertexShader= new QGLShader(QGLShader::VertexShader, context);
-    defaultVertexShader->addSource(QLatin1String(qglslDefaultVertexShader));
-    if (!defaultVertexShader->compile())
-        qWarning() << "Default vertex shader failed to compile: " << defaultVertexShader->log();
-
-    noBrushShader = new QGLShader(QGLShader::FragmentShader, context);
-    noBrushShader->addSource(QLatin1String(qglslFragmentShaderMain));
-    noBrushShader->addSource(QLatin1String(qglslNoBrushFragmentShader));
-    if (!noBrushShader->compile())
-        qWarning() << "No brush shader failed to compile:" << noBrushShader->log();
-
-
-    // Create a program for noBrush:
-    QGLShaderProgram* noBrushProg = new QGLShaderProgram(ctx);
-    noBrushProg->addShader(defaultVertexShader);
-    noBrushProg->addShader(noBrushShader);
-    if (!noBrushProg->link())
-        qWarning() << "NoBrush shader program failed to link:" << noBrushProg->log();
-
-    // Add noBrush Program to cache:
-    QGLCachedShaderProg cachedProg;
-    cachedProg.vertexShader = defaultVertexShader;
-    cachedProg.brushShader = noBrushShader;
-    cachedProg.compositionShader = 0;
-    cachedProg.shader = noBrushProg;
-    cachedPrograms.append(cachedProg);
-
-
-    // Set state
-    useGlobalOpacity = true;
-    currentBrushStyle = Qt::NoBrush;
-    currentTransformType = FullTransform;
-    shaderProgNeedsChanging = false;
-    activeProgram = noBrushProg;
-
-    solidBrushShader    = 0;
-
-    conicalBrushVertexShader = 0;
-    conicalBrushFragmentShader = 0;
-
-    radialBrushVertexShader   = 0;
-    radialBrushFragmentShader   = 0;
-
-    linearBrushVertexShader = 0;
-    linearBrushFragmentShader = 0;
-
-    patternBrushVertexShader  = 0;
-    patternBrushFragmentShader  = 0;
-
-    textureBrushFragmentShader  = 0;
-    textureBrushVertexShader  = 0;
-
-    simpleFragmentShader = 0;
-    simpleShaderProgram  = 0;
-
-    imageVertexShader = 0;
-    imageFragmentShader = 0;
-    imageShaderProgram = 0;
-
-    textVertexShader = 0;
-    textFragmentShader = 0;
-    textShaderProgram = 0;
-}
-
-QGLPEXShaderManager::~QGLPEXShaderManager()
-{
-    delete defaultVertexShader;
-    delete imageVertexShader;
-    delete imageFragmentShader;
-    delete imageShaderProgram;
-    delete textVertexShader;
-    delete textFragmentShader;
-    delete textShaderProgram;
-    delete noBrushShader;
-    delete solidBrushShader;
-
-    delete conicalBrushVertexShader;
-    delete conicalBrushFragmentShader;
-
-    delete radialBrushVertexShader;
-    delete radialBrushFragmentShader;
-
-    delete linearBrushFragmentShader;
-    delete linearBrushVertexShader;
-
-    delete patternBrushFragmentShader;
-    delete patternBrushVertexShader;
-
-    delete textureBrushFragmentShader;
-    delete textureBrushVertexShader;
-
-    delete simpleFragmentShader;
-    delete simpleShaderProgram;
-}
-
-void QGLPEXShaderManager::setUseGlobalOpacity(bool value)
-{
-    if (value != useGlobalOpacity)
-        shaderProgNeedsChanging = true;
-
-    useGlobalOpacity = value;
-}
-
-void QGLPEXShaderManager::setBrushStyle(Qt::BrushStyle style)
-{
-    if (currentBrushStyle != style)
-        shaderProgNeedsChanging = true;
-
-    currentBrushStyle = style;
-}
-
-void QGLPEXShaderManager::setAffineOnlyBrushTransform(bool value)
-{
-    Q_UNUSED(value);
-    // TODO
-}
-
-bool QGLPEXShaderManager::useCorrectShaderProg()
-{
-    if (!shaderProgNeedsChanging) {
-        activeProgram->use();
-        return false;
-    }
-
-    const char* fragmentShaderMainSrc = qglslFragmentShaderMain;
-    QGLShader* vertexShader = defaultVertexShader;
-    QGLShader* fragmentShader = noBrushShader;
-
-    // Make sure we compile up the correct brush shader
-    switch (currentBrushStyle) {
-    case Qt::NoBrush:
-        break;
-    case Qt::SolidPattern:
-        if (!solidBrushShader) {
-            qDebug("Compiling qglslSolidBrushFragmentShader");
-            solidBrushShader = new QGLShader(QGLShader::FragmentShader, ctx);
-            solidBrushShader->addSource(QLatin1String(qglslNoOpacityFragmentShaderMain));
-            solidBrushShader->addSource(QLatin1String(qglslSolidBrushFragmentShader));
-            if (!solidBrushShader->compile())
-                qWarning() << "qglslSolidBrush failed to compile:" << solidBrushShader->log();
-        }
-        fragmentShader = solidBrushShader;
-        break;
-    case Qt::TexturePattern:
-        if (!textureBrushVertexShader) {
-            qDebug("Compiling qglslTextureBrushVertexShader");
-            textureBrushVertexShader = new QGLShader(QGLShader::VertexShader, ctx);
-            textureBrushVertexShader->addSource(QLatin1String(qglslTextureBrushVertexShader));
-            if (!textureBrushVertexShader->compile()) {
-                qWarning() << "qglslTextureBrushVertexShader failed to compile: "
-                           << textureBrushVertexShader->log();
-            }
-        }
-        vertexShader = textureBrushVertexShader;
-
-        if (!textureBrushFragmentShader) {
-            qDebug("Compiling qglslTextureBrushFragmentShader");
-            textureBrushFragmentShader = new QGLShader(QGLShader::FragmentShader, ctx);
-            textureBrushFragmentShader->addSource(QLatin1String(fragmentShaderMainSrc));
-            textureBrushFragmentShader->addSource(QLatin1String(qglslTextureBrushFragmentShader));
-            if (!textureBrushFragmentShader->compile()) {
-                qWarning() << "qglslTextureBrushFragmentShader failed to compile:"
-                           << textureBrushFragmentShader->log();
-            }
-        }
-        fragmentShader = textureBrushFragmentShader;
-        break;
-    case Qt::LinearGradientPattern:
-        if (!linearBrushVertexShader) {
-            qDebug("Compiling qglslLinearGradientBrushVertexShader");
-            linearBrushVertexShader = new QGLShader(QGLShader::VertexShader, ctx);
-            linearBrushVertexShader->addSource(QLatin1String(qglslLinearGradientBrushVertexShader));
-            if (!linearBrushVertexShader->compile()) {
-                qWarning() << "qglslLinearGradientBrushVertexShader failed to compile: "
-                           << linearBrushVertexShader->log();
-            }
-        }
-        vertexShader = linearBrushVertexShader;
-
-        if (!linearBrushFragmentShader) {
-            qDebug("Compiling qglslLinearGradientBrushFragmentShader");
-            linearBrushFragmentShader = new QGLShader(QGLShader::FragmentShader, ctx);
-            linearBrushFragmentShader->addSource(QLatin1String(fragmentShaderMainSrc));
-            linearBrushFragmentShader->addSource(QLatin1String(qglslLinearGradientBrushFragmentShader));
-            if (!linearBrushFragmentShader->compile()) {
-                qWarning() << "qglslLinearGradientBrushFragmentShader failed to compile:"
-                           << linearBrushFragmentShader->log();
-            }
-        }
-        fragmentShader = linearBrushFragmentShader;
-        break;
-    case Qt::RadialGradientPattern:
-        if (!radialBrushVertexShader) {
-            qDebug("Compiling qglslRadialGradientBrushVertexShader");
-            radialBrushVertexShader = new QGLShader(QGLShader::VertexShader, ctx);
-            radialBrushVertexShader->addSource(QLatin1String(qglslRadialGradientBrushVertexShader));
-            if (!radialBrushVertexShader->compile()) {
-                qWarning() << "qglslRadialGradientBrushVertexShader failed to compile: "
-                           << radialBrushVertexShader->log();
-            }
-        }
-        vertexShader = radialBrushVertexShader;
-
-        if (!radialBrushFragmentShader) {
-            qDebug("Compiling qglslRadialGradientBrushFragmentShader");
-            radialBrushFragmentShader = new QGLShader(QGLShader::FragmentShader, ctx);
-            radialBrushFragmentShader->addSource(QLatin1String(fragmentShaderMainSrc));
-            radialBrushFragmentShader->addSource(QLatin1String(qglslRadialGradientBrushFragmentShader));
-            if (!radialBrushFragmentShader->compile()) {
-                qWarning() << "qglslRadialGradientBrushFragmentShader failed to compile:"
-                           << radialBrushFragmentShader->log();
-            }
-        }
-        fragmentShader = radialBrushFragmentShader;
-        break;
-    case Qt::ConicalGradientPattern:
-        // FIXME: We currently use the same vertex shader as radial brush
-        if (!conicalBrushVertexShader) {
-            qDebug("Compiling qglslConicalGradientBrushVertexShader");
-            conicalBrushVertexShader = new QGLShader(QGLShader::VertexShader, ctx);
-            conicalBrushVertexShader->addSource(QLatin1String(qglslConicalGradientBrushVertexShader));
-            if (!conicalBrushVertexShader->compile()) {
-                qWarning() << "qglslConicalGradientBrushVertexShader failed to compile: "
-                           << conicalBrushVertexShader->log();
-            }
-        }
-        vertexShader = conicalBrushVertexShader;
-
-        if (!conicalBrushFragmentShader) {
-            qDebug("Compiling qglslConicalGradientBrushFragmentShader");
-            conicalBrushFragmentShader = new QGLShader(QGLShader::FragmentShader, ctx);
-            conicalBrushFragmentShader->addSource(QLatin1String(fragmentShaderMainSrc));
-            conicalBrushFragmentShader->addSource(QLatin1String(qglslConicalGradientBrushFragmentShader));
-            if (!conicalBrushFragmentShader->compile()) {
-                qWarning() << "qglslConicalGradientBrushFragmentShader failed to compile:"
-                           << conicalBrushFragmentShader->log();
-            }
-        }
-        fragmentShader = conicalBrushFragmentShader;
-        break;
-    case Qt::Dense1Pattern:
-    case Qt::Dense2Pattern:
-    case Qt::Dense3Pattern:
-    case Qt::Dense4Pattern:
-    case Qt::Dense5Pattern:
-    case Qt::Dense6Pattern:
-    case Qt::Dense7Pattern:
-    case Qt::HorPattern:
-    case Qt::VerPattern:
-    case Qt::CrossPattern:
-    case Qt::BDiagPattern:
-    case Qt::FDiagPattern:
-    case Qt::DiagCrossPattern:
-        if (!patternBrushVertexShader) {
-            qDebug("Compiling qglslPatternBrushVertexShader");
-            patternBrushVertexShader = new QGLShader(QGLShader::VertexShader, ctx);
-            patternBrushVertexShader->addSource(QLatin1String(qglslPatternBrushVertexShader));
-            if (!patternBrushVertexShader->compile()) {
-                qWarning() << "qglslPatternBrushVertexShader failed to compile: "
-                           << patternBrushVertexShader->log();
-            }
-        }
-        vertexShader = patternBrushVertexShader;
-
-        if (!patternBrushFragmentShader) {
-            qDebug("Compiling qglslPatternBrushFragmentShader");
-            patternBrushFragmentShader = new QGLShader(QGLShader::FragmentShader, ctx);
-            patternBrushFragmentShader->addSource(QLatin1String(qglslNoOpacityFragmentShaderMain));
-            patternBrushFragmentShader->addSource(QLatin1String(qglslPatternBrushFragmentShader));
-            if (!patternBrushFragmentShader->compile()) {
-                qWarning() << "qglslPatternBrushFragmentShader failed to compile:"
-                           << patternBrushFragmentShader->log();
-            }
-        }
-        fragmentShader = patternBrushFragmentShader;
-        break;
-    default:
-        qWarning("Unimplemented brush style (%d)", currentBrushStyle);
-    }
-
-    // Now newBrushShader is set correctly, check to see if we already have the program
-    // already linked and ready to go in the cache:
-    bool foundProgram = false;
-    foreach (QGLCachedShaderProg cachedProg, cachedPrograms) {
-        if ((cachedProg.vertexShader == vertexShader) &&
-            (cachedProg.brushShader == fragmentShader) &&
-            (cachedProg.compositionShader == 0) ) {
-
-            activeProgram = cachedProg.shader;
-            foundProgram = true;
-            break;
-        }
-    }
-
-    if (!foundProgram) {
-        qDebug() << "Linking shader program for " << currentBrushStyle;
-        // Required program not found - create it.
-        QGLShaderProgram* newProg = new QGLShaderProgram(ctx);
-
-        newProg->addShader(vertexShader);
-        newProg->addShader(fragmentShader);
-
-        if (!newProg->link())
-            qWarning() << "Shader program for " << currentBrushStyle << "failed to link:" << newProg->log();
-
-        QGLCachedShaderProg cachedProg;
-        cachedProg.vertexShader = vertexShader;
-        cachedProg.brushShader = fragmentShader;
-        cachedProg.compositionShader = 0;
-        cachedProg.shader = newProg;
-
-        cachedPrograms.append(cachedProg);
-        activeProgram = newProg;
-    }
-
-    activeProgram->use();
-    shaderProgNeedsChanging = false;
-    return true;
-}
-
-QGLShaderProgram* QGLPEXShaderManager::brushShader()
-{
-    return activeProgram;
-}
-
-// The only uniform the simple shader has is the PMV matrix
-QGLShaderProgram* QGLPEXShaderManager::simpleShader()
-{
-    if (!simpleShaderProgram) {
-        simpleShaderProgram = new QGLShaderProgram(ctx);
-
-        if (!simpleFragmentShader) {
-            simpleFragmentShader = new QGLShader(QGLShader::FragmentShader, ctx);
-            simpleFragmentShader->addSource(QLatin1String(qglslSimpleFragmentShader));
-            if (!simpleFragmentShader->compile())
-                qWarning() << "qglslSimpleFragmentShader failed to compile:" << simpleFragmentShader->log();
-        }
-
-        simpleShaderProgram->addShader(defaultVertexShader);
-        simpleShaderProgram->addShader(simpleFragmentShader);
-        if (!simpleShaderProgram->link())
-            qWarning() << "Simple shader program failed to link:" << simpleShaderProgram->log();
-    }
-
-    return simpleShaderProgram;
-}
-
-QGLShaderProgram* QGLPEXShaderManager::imageShader()
-{
-    if (!imageShaderProgram) {
-        if (!imageVertexShader) {
-            imageVertexShader = new QGLShader(QGLShader::VertexShader, ctx);
-            imageVertexShader->addSource(QLatin1String(qglslImageVertexShader));
-            if (!imageVertexShader->compile())
-                qWarning() << "Image/Pixmap vertex shader failed to compile:" << imageVertexShader->log();
-        }
-
-        if (!imageFragmentShader) {
-            imageFragmentShader = new QGLShader(QGLShader::FragmentShader, ctx);
-            imageFragmentShader->addSource(QLatin1String(qglslImageFragmentShader));
-            if (!imageFragmentShader->compile())
-                qWarning() << "Image/Pixmap fragment shader failed to compile:" << imageFragmentShader->log();
-        }
-
-        imageShaderProgram = new QGLShaderProgram(ctx);
-        imageShaderProgram->addShader(imageVertexShader);
-        imageShaderProgram->addShader(imageFragmentShader);
-        if (!imageShaderProgram->link())
-            qWarning() << "Image/Pixmap shader program failed to link:" << imageShaderProgram->log();
-    }
-
-    return imageShaderProgram;
-}
-
-QGLShaderProgram* QGLPEXShaderManager::textShader()
-{
-    if (!textShaderProgram) {
-        if (!textVertexShader) {
-            textVertexShader = new QGLShader(QGLShader::VertexShader, ctx);
-            textVertexShader->addSource(QLatin1String(qglslImageVertexShader));
-            if (!textVertexShader->compile())
-                qWarning() << "Text vertex shader failed to compile:" << textVertexShader->log();
-        }
-
-        if (!textFragmentShader) {
-            textFragmentShader = new QGLShader(QGLShader::FragmentShader, ctx);
-            textFragmentShader->addSource(QLatin1String(qglslTextFragmentShader));
-            if (!textFragmentShader->compile())
-                qWarning() << "Text fragment shader failed to compile:" << textFragmentShader->log();
-        }
-
-        textShaderProgram = new QGLShaderProgram(ctx);
-        textShaderProgram->addShader(textVertexShader);
-        textShaderProgram->addShader(textFragmentShader);
-        if (!textShaderProgram->link())
-            qWarning() << "Text shader program failed to link:" << textShaderProgram->log();
-    }
-
-    return textShaderProgram;
-}
-
diff --git a/src/opengl/gl2paintengineex/qglpexshadermanager_p.h b/src/opengl/gl2paintengineex/qglpexshadermanager_p.h
deleted file mode 100644
index c8f47b2..0000000
--- a/src/opengl/gl2paintengineex/qglpexshadermanager_p.h
+++ /dev/null
@@ -1,156 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
-** Contact: Qt Software Information (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 qt-sales@nokia.com.
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-//
-//  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.
-//
-
-#include "qglshader_p.h"
-
-
-// Worstcase combo: Brush->Mask->Composition
-
-/*
-    Vertex shader source is specified with a single string. This string
-    contains the main function and sets the gl_Position. The choice of
-    which vertex shader to use depends on:
-        - Brush style
-        - Brush transform->isAffine()
-
-    Fragment shaders are specified as multiple strings, one for the main
-    function, one for the brush calculation and optionally one for the
-    extended composition mode. Brushes are implementations of
-        "mediump vec4 brush()" 
-    Composition modes are implemented as a
-        "mediump vec4 compose(mediump vec4 color)"
-    NOTE: Precision may change in future.
-
-    The choice of which main() fragment shader string to use depends on:
-        - Global opacity
-        - Brush style (some brushes apply opacity themselves)
-        - Use of mask (TODO: Need to support high quality anti-aliasing & text)
-        - Composition mode
-
-    The choice of which brush() fragment shader to use depends on:
-        - Brush style
-
-*/
-
-
-struct QGLCachedShaderProg
-{
-    QGLShader*          vertexShader;
-    QGLShader*          brushShader;
-    QGLShader*          compositionShader;
-    QGLShaderProgram*   shader;
-};
-
-class QGLPEXShaderManager
-{
-public:
-    QGLPEXShaderManager(const QGLContext* context);
-    ~QGLPEXShaderManager();
-
-    enum TransformType {IdentityTransform, ScaleTransform, TranslateTransform, FullTransform};
-
-    void optimiseForBrushTransform(const QTransform& transform);
-    void setBrushStyle(Qt::BrushStyle style);
-    void setUseGlobalOpacity(bool value);
-    void setAffineOnlyBrushTransform(bool value); // I.e. Do we need to apply perspective-correction?
-                                                  // Not doing so saves some vertex shader calculations.
-
-    bool useCorrectShaderProg(); // returns true if the shader program has changed
-
-    QGLShaderProgram* brushShader();
-    QGLShaderProgram* simpleShader(); // Used to draw into e.g. stencil buffers
-    QGLShaderProgram* imageShader();
-    QGLShaderProgram* textShader();
-
-private:
-    QGLShader* defaultVertexShader;
-
-    QGLShader* imageVertexShader;
-    QGLShader* imageFragmentShader;
-    QGLShaderProgram* imageShaderProgram;
-
-    QGLShader* textVertexShader;
-    QGLShader* textFragmentShader;
-    QGLShaderProgram* textShaderProgram;
-
-    QGLShader* noBrushShader;
-    QGLShader* solidBrushShader;
-
-    QGLShader* conicalBrushVertexShader;
-    QGLShader* conicalBrushFragmentShader;
-
-    QGLShader* radialBrushVertexShader;
-    QGLShader* radialBrushFragmentShader;
-
-    QGLShader* linearBrushVertexShader;
-    QGLShader* linearBrushFragmentShader;
-
-    QGLShader* patternBrushVertexShader;
-    QGLShader* patternBrushFragmentShader;
-
-    QGLShader* textureBrushFragmentShader;
-    QGLShader* textureBrushVertexShader;
-
-    QGLShader*          simpleFragmentShader;
-    QGLShaderProgram*   simpleShaderProgram;
-
-    QGLShaderProgram*   activeProgram;
-
-    Qt::BrushStyle      currentBrushStyle;
-    bool                useGlobalOpacity;
-    TransformType       currentTransformType;
-    bool                shaderProgNeedsChanging;
-
-    QList<QGLCachedShaderProg> cachedPrograms;
-
-    QGLContext*          ctx;
-};
diff --git a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
index 89ed1f7..53ae4fb 100644
--- a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
+++ b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
@@ -77,7 +77,7 @@
 #include <private/qtextureglyphcache_p.h>
 
 #include "qglgradientcache_p.h"
-#include "qglpexshadermanager_p.h"
+#include "qglengineshadermanager_p.h"
 #include "qgl2pexvertexarray_p.h"
 
 
@@ -170,7 +170,7 @@ public:
 
     GLfloat pmvMatrix[4][4];
 
-    QGLPEXShaderManager* shaderManager;
+    QGLEngineShaderManager* shaderManager;
 
     // Clipping & state stuff stolen from QOpenGLPaintEngine:
     void updateDepthClip();
diff --git a/src/opengl/opengl.pro b/src/opengl/opengl.pro
index 3b8bfa1..1527f2d 100644
--- a/src/opengl/opengl.pro
+++ b/src/opengl/opengl.pro
@@ -43,16 +43,15 @@ SOURCES	+= qgl.cpp \
 
 #contains(QT_CONFIG, opengles2) {
     SOURCES +=  gl2paintengineex/qglgradientcache.cpp \
-                gl2paintengineex/qglpexshadermanager.cpp \
-                gl2paintengineex/qglshader.cpp \
+                gl2paintengineex/qglengineshadermanager.cpp \
                 gl2paintengineex/qgl2pexvertexarray.cpp \
                 gl2paintengineex/qpaintengineex_opengl2.cpp
 
     HEADERS +=  gl2paintengineex/qglgradientcache_p.h \
-                gl2paintengineex/qglpexshadermanager_p.h \
-                gl2paintengineex/qglshader_p.h \
+                gl2paintengineex/qglengineshadermanager_p.h \
                 gl2paintengineex/qgl2pexvertexarray_p.h \
-                gl2paintengineex/qpaintengineex_opengl2_p.h
+                gl2paintengineex/qpaintengineex_opengl2_p.h \
+                gl2paintengineex/glgc_shader_source.h
 #}