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

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

#ifndef QGRAPHICSCONTEXT_OPENGL2_P_H

#define QGRAPHICSCONTEXT_OPENGL2_P_H

//

//  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 <QDebug>

#include <private/qpaintengineex_p.h>

#include <private/qglengineshadermanager_p.h>

#include <private/qgl2pexvertexarray_p.h>

#include <private/qglpaintdevice_p.h>

#include <private/qglpixmapfilter_p.h>

#include <private/qfontengine_p.h>

#include <private/qdatabuffer_p.h>

#include <private/qtriangulatingstroker_p.h>

enum EngineMode {

    ImageDrawingMode,

    TextDrawingMode,

    BrushDrawingMode,

    ImageArrayDrawingMode

};

QT_BEGIN_NAMESPACE

class QGL2PaintEngineExPrivate;

class QOpenGL2PaintEngineState : public QPainterState

{

public:

    QOpenGL2PaintEngineState(QOpenGL2PaintEngineState &other);

    QOpenGL2PaintEngineState();

    ~QOpenGL2PaintEngineState();

    uint isNew : 1;

    uint needsClipBufferClear : 1;

    uint clipTestEnabled : 1;

    uint canRestoreClip : 1;

    uint matrixChanged : 1;

    uint compositionModeChanged : 1;

    uint opacityChanged : 1;

    uint renderHintsChanged : 1;

    uint clipChanged : 1;

    uint currentClip : 8;

    QRect rectangleClip;

};

class Q_OPENGL_EXPORT QGL2PaintEngineEx : public QPaintEngineEx

{

    Q_DECLARE_PRIVATE(QGL2PaintEngineEx)

public:

    QGL2PaintEngineEx();

    ~QGL2PaintEngineEx();

    bool begin(QPaintDevice *device);

    bool end();

    void ensureActive();

    virtual void fill(const QVectorPath &path, const QBrush &brush);

    virtual void stroke(const QVectorPath &path, const QPen &pen);

    virtual void clip(const QVectorPath &path, Qt::ClipOperation op);

    virtual void clipEnabledChanged();

    virtual void penChanged();

    virtual void brushChanged();

    virtual void brushOriginChanged();

    virtual void opacityChanged();

    virtual void compositionModeChanged();

    virtual void renderHintsChanged();

    virtual void transformChanged();

    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);

    virtual void drawPixmaps(const QDrawPixmaps::Data *drawingData, int dataCount, const QPixmap &pixmap, QDrawPixmaps::DrawingHints hints);

    Type type() const { return OpenGL2; }

    void setState(QPainterState *s);

    QPainterState *createState(QPainterState *orig) const;

    inline QOpenGL2PaintEngineState *state() {

        return static_cast<QOpenGL2PaintEngineState *>(QPaintEngineEx::state());

    }

    inline const QOpenGL2PaintEngineState *state() const {

        return static_cast<const QOpenGL2PaintEngineState *>(QPaintEngineEx::state());

    }

    void beginNativePainting();

    void endNativePainting();

    const QGLContext* context();

    QPixmapFilter *pixmapFilter(int type, const QPixmapFilter *prototype);

    void setRenderTextActive(bool);

private:

    Q_DISABLE_COPY(QGL2PaintEngineEx)

};

class QGL2PaintEngineExPrivate : public QPaintEngineExPrivate

{

    Q_DECLARE_PUBLIC(QGL2PaintEngineEx)

public:

    enum StencilFillMode {

        OddEvenFillMode,

        WindingFillMode,

        TriStripStrokeFillMode

    };

    QGL2PaintEngineExPrivate(QGL2PaintEngineEx *q_ptr) :

            q(q_ptr),

            width(0), height(0),

            ctx(0),

            currentBrush(0),

            inverseScale(1),

            shaderManager(0),

            inRenderText(false)

    { }

    ~QGL2PaintEngineExPrivate();

    void updateBrushTexture();

    void updateBrushUniforms();

    void updateMatrix();

    void updateCompositionMode();

    void updateTextureFilter(GLenum target, GLenum wrapMode, bool smoothPixmapTransform, GLuint id = -1);

    void setBrush(const QBrush* brush);

    void transferMode(EngineMode newMode);

    void resetGLState();

    // fill, drawOutline, drawTexture & drawCachedGlyphs are the rendering entry points:

    void fill(const QVectorPath &path);

    void drawTexture(const QGLRect& dest, const QGLRect& src, const QSize &textureSize, bool opaque, bool pattern = false);

    void drawCachedGlyphs(const QPointF &p, QFontEngineGlyphCache::Type glyphType, const QTextItemInt &ti);

    void drawVertexArrays(const float *data, const QVector<int> *stops, GLenum primitive);

    void drawVertexArrays(QGL2PEXVertexArray &vertexArray, GLenum primitive) {

        drawVertexArrays((const float *) vertexArray.data(), &vertexArray.stops(), primitive);

    }

        // ^ draws whatever is in the vertex array

    void composite(const QGLRect& boundingRect);

        // ^ Composites the bounding rect onto dest buffer

    void fillStencilWithVertexArray(const float *data, int count, const QVector<int> *stops, const QGLRect &bounds, StencilFillMode mode);

    void fillStencilWithVertexArray(QGL2PEXVertexArray& vertexArray, bool useWindingFill) {

        fillStencilWithVertexArray((const float *) vertexArray.data(), 0, &vertexArray.stops(),

                                   vertexArray.boundingRect(),

                                   useWindingFill ? WindingFillMode : OddEvenFillMode);

    }

        // ^ Calls drawVertexArrays to render into stencil buffer

    bool prepareForDraw(bool srcPixelsAreOpaque);

        // ^ returns whether the current program changed or not

    inline void useSimpleShader();

    void prepareDepthRangeForRenderText();

    void restoreDepthRangeForRenderText();

    static QGLEngineShaderManager* shaderManagerForEngine(QGL2PaintEngineEx *engine) { return engine->d_func()->shaderManager; }

    QGL2PaintEngineEx* q;

    QGLPaintDevice* device;

    int width, height;

    QGLContext *ctx;

    EngineMode mode;

    QFontEngineGlyphCache::Type glyphCacheType;

    // Dirty flags

    bool matrixDirty; // Implies matrix uniforms are also dirty

    bool compositionModeDirty;

    bool brushTextureDirty;

    bool brushUniformsDirty;

    bool simpleShaderMatrixUniformDirty;

    bool shaderMatrixUniformDirty;

    bool opacityUniformDirty;

    bool stencilClean; // Has the stencil not been used for clipping so far?

    QRegion dirtyStencilRegion;

    QRect currentScissorBounds;

    uint maxClip;

    const QBrush*    currentBrush; // May not be the state's brush!

    GLfloat     inverseScale;

    QGL2PEXVertexArray vertexCoordinateArray;

    QGL2PEXVertexArray textureCoordinateArray;

    QDataBuffer<GLfloat> opacityArray;

    GLfloat staticVertexCoordinateArray[8];

    GLfloat staticTextureCoordinateArray[8];

    GLfloat pmvMatrix[4][4];

    QGLEngineShaderManager* shaderManager;

    void clearClip(uint value);

    void writeClip(const QVectorPath &path, uint value);

    void resetClipIfNeeded();

    void updateClipScissorTest();

    void setScissor(const QRect &rect);

    void regenerateClip();

    void systemStateChanged();

    uint use_system_clip : 1;

    uint location(QGLEngineShaderManager::Uniform uniform)

    {

        return shaderManager->getUniformLocation(uniform);

    }

    GLuint lastTexture;

    bool needsSync;

    bool inRenderText;

    GLfloat depthRange[2];

    float textureInvertedY;

    QTriangulatingStroker stroker;

    QDashedStrokeProcessor dasher;

    QTransform temporaryTransform;

    QScopedPointer<QPixmapFilter> convolutionFilter;

    QScopedPointer<QPixmapFilter> colorizeFilter;

    QScopedPointer<QPixmapFilter> blurFilter;

    QScopedPointer<QPixmapFilter> fastBlurFilter;

    QScopedPointer<QPixmapFilter> dropShadowFilter;

    QScopedPointer<QPixmapFilter> fastDropShadowFilter;

};

QT_END_NAMESPACE

#endif