/****************************************************************************

**

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtOpenGL module of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

** Alternatively, this file may be used under the terms of the GNU Lesser

** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at qt-info@nokia.com.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

****************************************************************************/

#include "qglengineshadermanager_p.h"

#include "qglengineshadersource_p.h"

#if defined(QT_DEBUG)

#include <QMetaEnum>

#endif

QT_BEGIN_NAMESPACE

static void qt_shared_shaders_free(void *data)

{

    delete reinterpret_cast<QGLEngineSharedShaders *>(data);

}

Q_GLOBAL_STATIC_WITH_ARGS(QGLContextResource, qt_shared_shaders, (qt_shared_shaders_free))

QGLEngineSharedShaders *QGLEngineSharedShaders::shadersForContext(const QGLContext *context)

{

    QGLEngineSharedShaders *p = reinterpret_cast<QGLEngineSharedShaders *>(qt_shared_shaders()->value(context));

    if (!p) {

        QGLShareContextScope scope(context);

        qt_shared_shaders()->insert(context, p = new QGLEngineSharedShaders(context));

    }

    return p;

}

const char* QGLEngineSharedShaders::qShaderSnippets[] = {

    0,0,0,0,0,0,0,0,0,0,

    0,0,0,0,0,0,0,0,0,0,

    0,0,0,0,0,0,0,0,0,0,

    0,0,0,0,0

};

QGLEngineSharedShaders::QGLEngineSharedShaders(const QGLContext* context)

    : ctxGuard(context)

    , blitShaderProg(0)

    , simpleShaderProg(0)

{

/*

    Rather than having the shader source array statically initialised, it is initialised

    here instead. This is to allow new shader names to be inserted or existing names moved

    around without having to change the order of the glsl strings. It is hoped this will

    make future hard-to-find runtime bugs more obvious and generally give more solid code.

*/

    static bool snippetsPopulated = false;

    if (!snippetsPopulated) {

        const char** code = qShaderSnippets; // shortcut

        code[MainVertexShader] = qglslMainVertexShader;

        code[MainWithTexCoordsVertexShader] = qglslMainWithTexCoordsVertexShader;

        code[MainWithTexCoordsAndOpacityVertexShader] = qglslMainWithTexCoordsAndOpacityVertexShader;

        code[UntransformedPositionVertexShader] = qglslUntransformedPositionVertexShader;

        code[PositionOnlyVertexShader] = qglslPositionOnlyVertexShader;

        code[PositionWithPatternBrushVertexShader] = qglslPositionWithPatternBrushVertexShader;

        code[PositionWithLinearGradientBrushVertexShader] = qglslPositionWithLinearGradientBrushVertexShader;

        code[PositionWithConicalGradientBrushVertexShader] = qglslPositionWithConicalGradientBrushVertexShader;

        code[PositionWithRadialGradientBrushVertexShader] = qglslPositionWithRadialGradientBrushVertexShader;

        code[PositionWithTextureBrushVertexShader] = qglslPositionWithTextureBrushVertexShader;

        code[AffinePositionWithPatternBrushVertexShader] = qglslAffinePositionWithPatternBrushVertexShader;

        code[AffinePositionWithLinearGradientBrushVertexShader] = qglslAffinePositionWithLinearGradientBrushVertexShader;

        code[AffinePositionWithConicalGradientBrushVertexShader] = qglslAffinePositionWithConicalGradientBrushVertexShader;

        code[AffinePositionWithRadialGradientBrushVertexShader] = qglslAffinePositionWithRadialGradientBrushVertexShader;

        code[AffinePositionWithTextureBrushVertexShader] = qglslAffinePositionWithTextureBrushVertexShader;

        code[MainFragmentShader_CMO] = qglslMainFragmentShader_CMO;

        code[MainFragmentShader_CM] = qglslMainFragmentShader_CM;

        code[MainFragmentShader_MO] = qglslMainFragmentShader_MO;

        code[MainFragmentShader_M] = qglslMainFragmentShader_M;

        code[MainFragmentShader_CO] = qglslMainFragmentShader_CO;

        code[MainFragmentShader_C] = qglslMainFragmentShader_C;

        code[MainFragmentShader_O] = qglslMainFragmentShader_O;

        code[MainFragmentShader] = qglslMainFragmentShader;

        code[MainFragmentShader_ImageArrays] = qglslMainFragmentShader_ImageArrays;

        code[ImageSrcFragmentShader] = qglslImageSrcFragmentShader;

        code[ImageSrcWithPatternFragmentShader] = qglslImageSrcWithPatternFragmentShader;

        code[NonPremultipliedImageSrcFragmentShader] = qglslNonPremultipliedImageSrcFragmentShader;

        code[CustomImageSrcFragmentShader] = qglslCustomSrcFragmentShader; // Calls "customShader", which must be appended

        code[SolidBrushSrcFragmentShader] = qglslSolidBrushSrcFragmentShader;

        code[TextureBrushSrcFragmentShader] = qglslTextureBrushSrcFragmentShader;

        code[TextureBrushSrcWithPatternFragmentShader] = qglslTextureBrushSrcWithPatternFragmentShader;

        code[PatternBrushSrcFragmentShader] = qglslPatternBrushSrcFragmentShader;

        code[LinearGradientBrushSrcFragmentShader] = qglslLinearGradientBrushSrcFragmentShader;

        code[RadialGradientBrushSrcFragmentShader] = qglslRadialGradientBrushSrcFragmentShader;

        code[ConicalGradientBrushSrcFragmentShader] = qglslConicalGradientBrushSrcFragmentShader;

        code[ShockingPinkSrcFragmentShader] = qglslShockingPinkSrcFragmentShader;

        code[NoMaskFragmentShader] = "";

        code[MaskFragmentShader] = qglslMaskFragmentShader;

        code[RgbMaskFragmentShaderPass1] = qglslRgbMaskFragmentShaderPass1;

        code[RgbMaskFragmentShaderPass2] = qglslRgbMaskFragmentShaderPass2;

        code[RgbMaskWithGammaFragmentShader] = ""; //###

        code[NoCompositionModeFragmentShader] = "";

        code[MultiplyCompositionModeFragmentShader] = ""; //###

        code[ScreenCompositionModeFragmentShader] = ""; //###

        code[OverlayCompositionModeFragmentShader] = ""; //###

        code[DarkenCompositionModeFragmentShader] = ""; //###

        code[LightenCompositionModeFragmentShader] = ""; //###

        code[ColorDodgeCompositionModeFragmentShader] = ""; //###

        code[ColorBurnCompositionModeFragmentShader] = ""; //###

        code[HardLightCompositionModeFragmentShader] = ""; //###

        code[SoftLightCompositionModeFragmentShader] = ""; //###

        code[DifferenceCompositionModeFragmentShader] = ""; //###

        code[ExclusionCompositionModeFragmentShader] = ""; //###

#if defined(QT_DEBUG)

        // Check that all the elements have been filled:

        for (int i = 0; i < TotalSnippetCount; ++i) {

            if (qShaderSnippets[i] == 0) {

                qFatal("Shader snippet for %s (#%d) is missing!",

                       snippetNameStr(SnippetName(i)).constData(), i);

            }

        }

#endif

        snippetsPopulated = true;

    }

    QGLShader* fragShader;

    QGLShader* vertexShader;

    QByteArray source;

    // Compile up the simple shader:

    source.clear();

    source.append(qShaderSnippets[MainVertexShader]);

    source.append(qShaderSnippets[PositionOnlyVertexShader]);

    vertexShader = new QGLShader(QGLShader::Vertex, context, this);

    source.clear();

    source.append(qShaderSnippets[MainFragmentShader]);

    source.append(qShaderSnippets[ShockingPinkSrcFragmentShader]);

    fragShader = new QGLShader(QGLShader::Fragment, context, this);

    simpleShaderProg = new QGLShaderProgram(context, this);

    simpleShaderProg->addShader(vertexShader);

    simpleShaderProg->addShader(fragShader);

    simpleShaderProg->bindAttributeLocation("vertexCoordsArray", QT_VERTEX_COORDS_ATTR);

    simpleShaderProg->link();

    if (!simpleShaderProg->isLinked()) {

        qCritical() << "Errors linking simple shader:"

                    << simpleShaderProg->log();

    }

    // Compile the blit shader:

    source.clear();

    source.append(qShaderSnippets[MainWithTexCoordsVertexShader]);

    source.append(qShaderSnippets[UntransformedPositionVertexShader]);

    vertexShader = new QGLShader(QGLShader::Vertex, context, this);

    source.clear();

    source.append(qShaderSnippets[MainFragmentShader]);

    source.append(qShaderSnippets[ImageSrcFragmentShader]);

    fragShader = new QGLShader(QGLShader::Fragment, context, this);

    blitShaderProg = new QGLShaderProgram(context, this);

    blitShaderProg->addShader(vertexShader);

    blitShaderProg->addShader(fragShader);

    blitShaderProg->bindAttributeLocation("textureCoordArray", QT_TEXTURE_COORDS_ATTR);

    blitShaderProg->bindAttributeLocation("vertexCoordsArray", QT_VERTEX_COORDS_ATTR);

    blitShaderProg->link();

    if (!blitShaderProg->isLinked()) {

        qCritical() << "Errors linking blit shader:"

                    << simpleShaderProg->log();

    }

}

#if defined (QT_DEBUG)

QByteArray QGLEngineSharedShaders::snippetNameStr(SnippetName name)

{

    QMetaEnum m = staticMetaObject.enumerator(staticMetaObject.indexOfEnumerator("SnippetName"));

    return QByteArray(m.valueToKey(name));

}

#endif

// The address returned here will only be valid until next time this function is called.

QGLEngineShaderProg *QGLEngineSharedShaders::findProgramInCache(const QGLEngineShaderProg &prog)

{

    for (int i = 0; i < cachedPrograms.size(); ++i) {

        QGLEngineShaderProg *cachedProg = cachedPrograms[i];

        if (*cachedProg == prog) {

            // Move the program to the top of the list as a poor-man's cache algo

            cachedPrograms.move(i, 0);

            return cachedProg;

        }

    }

#if defined(QT_DEBUG)

#endif

#if defined(QT_DEBUG)

#endif

        if (cachedPrograms.count() > 30) {

            // The cache is full, so delete the last 5 programs in the list.

            // These programs will be least used, as a program us bumped to

            // the top of the list when it's used.

            for (int i = 0; i < 5; ++i) {

                delete cachedPrograms.last();

                cachedPrograms.removeLast();

            }

        }

        cachedPrograms.insert(0, newProg);

    }

    return newProg;

}

void QGLEngineSharedShaders::cleanupCustomStage(QGLCustomShaderStage* stage)

{

    // Remove any shader programs which has this as the custom shader src:

    for (int i = 0; i < cachedPrograms.size(); ++i) {

        QGLEngineShaderProg *cachedProg = cachedPrograms[i];

        if (cachedProg->customStageSource == stage->source()) {

            delete cachedProg;

            cachedPrograms.removeAt(i);

            i--;

        }

    }

}

QGLEngineShaderManager::QGLEngineShaderManager(QGLContext* context)

    : ctx(context),

      shaderProgNeedsChanging(true),

      srcPixelType(Qt::NoBrush),

      opacityMode(NoOpacity),

      maskType(NoMask),

      compositionMode(QPainter::CompositionMode_SourceOver),

      customSrcStage(0),

      currentShaderProg(0)

{

    sharedShaders = QGLEngineSharedShaders::shadersForContext(context);

    connect(sharedShaders, SIGNAL(shaderProgNeedsChanging()), this, SLOT(shaderProgNeedsChangingSlot()));

}

QGLEngineShaderManager::~QGLEngineShaderManager()

{

    //###

    removeCustomStage();

}

{

    QVector<uint> &uniformLocations = currentShaderProg->uniformLocations;

    if (uniformLocations.isEmpty())

        uniformLocations.fill(GLuint(-1), NumUniforms);

    static const char *uniformNames[] = {

        "imageTexture",

        "patternColor",

        "globalOpacity",

        "depth",

        "pmvMatrix",

        "maskTexture",

        "fragmentColor",

        "linearData",

        "angle",

        "halfViewportSize",

        "fmp",

        "fmp2_m_radius2",

        "inverse_2_fmp2_m_radius2",

        "invertedTextureSize",

        "brushTransform",

        "brushTexture"

    };

    if (uniformLocations.at(id) == GLuint(-1))

        uniformLocations[id] = currentShaderProg->program->uniformLocation(uniformNames[id]);

    return uniformLocations.at(id);

}

{

}

void QGLEngineShaderManager::setDirty()

{

    shaderProgNeedsChanging = true;

}

void QGLEngineShaderManager::setSrcPixelType(Qt::BrushStyle style)

{

    Q_ASSERT(style != Qt::NoBrush);

    if (srcPixelType == PixelSrcType(style))

        return;

    srcPixelType = style;

    shaderProgNeedsChanging = true; //###

}

void QGLEngineShaderManager::setSrcPixelType(PixelSrcType type)

{

    if (srcPixelType == type)

        return;

    srcPixelType = type;

    shaderProgNeedsChanging = true; //###

}

void QGLEngineShaderManager::setOpacityMode(OpacityMode mode)

{

    if (opacityMode == mode)

        return;

    opacityMode = mode;

    shaderProgNeedsChanging = true; //###

}

void QGLEngineShaderManager::setMaskType(MaskType type)

{

    if (maskType == type)

        return;

    maskType = type;

    shaderProgNeedsChanging = true; //###

}

void QGLEngineShaderManager::setCompositionMode(QPainter::CompositionMode mode)

{

    if (compositionMode == mode)

        return;

    compositionMode = mode;

    shaderProgNeedsChanging = true; //###

}

void QGLEngineShaderManager::setCustomStage(QGLCustomShaderStage* stage)

{

    if (customSrcStage)

        removeCustomStage();

    customSrcStage = stage;