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#ifndef QPAINTENGINEEX_OPENGL2_P_H
#define QPAINTENGINEEX_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/qfontengine_p.h>
#include <private/qdatabuffer_p.h>
#include <private/qtriangulatingstroker_p.h>
#include <private/qopenglextensions_p.h>
enum EngineMode {
ImageDrawingMode,
TextDrawingMode,
BrushDrawingMode,
ImageArrayDrawingMode
};
QT_BEGIN_NAMESPACE
#define GL_STENCIL_HIGH_BIT GLuint(0x80)
#define QT_BRUSH_TEXTURE_UNIT GLuint(0)
#define QT_IMAGE_TEXTURE_UNIT GLuint(0) //Can be the same as brush texture unit
#define QT_MASK_TEXTURE_UNIT GLuint(1)
#define QT_BACKGROUND_TEXTURE_UNIT GLuint(2)
class QGL2PaintEngineExPrivate;
class QGL2PaintEngineState : public QPainterState
{
public:
QGL2PaintEngineState(QGL2PaintEngineState &other);
QGL2PaintEngineState();
~QGL2PaintEngineState();
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) Q_DECL_OVERRIDE;
void ensureActive();
bool end() Q_DECL_OVERRIDE;
virtual void clipEnabledChanged() Q_DECL_OVERRIDE;
virtual void penChanged() Q_DECL_OVERRIDE;
virtual void brushChanged() Q_DECL_OVERRIDE;
virtual void brushOriginChanged() Q_DECL_OVERRIDE;
virtual void opacityChanged() Q_DECL_OVERRIDE;
virtual void compositionModeChanged() Q_DECL_OVERRIDE;
virtual void renderHintsChanged() Q_DECL_OVERRIDE;
virtual void transformChanged() Q_DECL_OVERRIDE;
virtual void drawPixmap(const QRectF &r, const QPixmap &pm, const QRectF &sr) Q_DECL_OVERRIDE;
virtual void drawPixmapFragments(const QPainter::PixmapFragment *fragments, int fragmentCount, const QPixmap &pixmap,
QPainter::PixmapFragmentHints hints) Q_DECL_OVERRIDE;
virtual void drawImage(const QRectF &r, const QImage &pm, const QRectF &sr,
Qt::ImageConversionFlags flags = Qt::AutoColor) Q_DECL_OVERRIDE;
virtual void drawTextItem(const QPointF &p, const QTextItem &textItem) Q_DECL_OVERRIDE;
virtual void fill(const QVectorPath &path, const QBrush &brush) Q_DECL_OVERRIDE;
virtual void stroke(const QVectorPath &path, const QPen &pen) Q_DECL_OVERRIDE;
virtual void clip(const QVectorPath &path, Qt::ClipOperation op) Q_DECL_OVERRIDE;
virtual void drawStaticTextItem(QStaticTextItem *textItem) Q_DECL_OVERRIDE;
bool drawTexture(const QRectF &r, GLuint textureId, const QSize &size, const QRectF &sr);
Type type() const Q_DECL_OVERRIDE { return OpenGL2; }
virtual void setState(QPainterState *s) Q_DECL_OVERRIDE;
virtual QPainterState *createState(QPainterState *orig) const Q_DECL_OVERRIDE;
inline QGL2PaintEngineState *state() {
return static_cast<QGL2PaintEngineState *>(QPaintEngineEx::state());
}
inline const QGL2PaintEngineState *state() const {
return static_cast<const QGL2PaintEngineState *>(QPaintEngineEx::state());
}
void beginNativePainting() Q_DECL_OVERRIDE;
void endNativePainting() Q_DECL_OVERRIDE;
void invalidateState();
void setRenderTextActive(bool);
bool isNativePaintingActive() const;
bool requiresPretransformedGlyphPositions(QFontEngine *, const QTransform &) const Q_DECL_OVERRIDE { return false; }
bool shouldDrawCachedGlyphs(QFontEngine *, const QTransform &) const Q_DECL_OVERRIDE;
void setTranslateZ(GLfloat z);
private:
Q_DISABLE_COPY(QGL2PaintEngineEx)
};
class QGL2PaintEngineExPrivate : public QPaintEngineExPrivate, protected QOpenGLExtensions
{
Q_DECLARE_PUBLIC(QGL2PaintEngineEx)
public:
enum StencilFillMode {
OddEvenFillMode,
WindingFillMode,
TriStripStrokeFillMode
};
QGL2PaintEngineExPrivate(QGL2PaintEngineEx *q_ptr) :
q(q_ptr),
shaderManager(0),
width(0), height(0),
ctx(0),
useSystemClip(true),
elementIndicesVBOId(0),
opacityArray(0),
snapToPixelGrid(false),
nativePaintingActive(false),
inverseScale(1),
lastMaskTextureUsed(0),
translateZ(0)
{ }
~QGL2PaintEngineExPrivate();
void updateBrushTexture();
void updateBrushUniforms();
void updateMatrix();
void updateCompositionMode();
void updateTextureFilter(GLenum target, GLenum wrapMode, bool smoothPixmapTransform, GLuint id = GLuint(-1));
void resetGLState();
bool resetOpenGLContextActiveEngine();
// fill, stroke, drawTexture, drawPixmaps & drawCachedGlyphs are the main rendering entry-points,
// however writeClip can also be thought of as en entry point as it does similar things.
void fill(const QVectorPath &path);
void stroke(const QVectorPath &path, const QPen &pen);
void drawTexture(const QGLRect& dest, const QGLRect& src, const QSize &textureSize, bool opaque, bool pattern = false);
void drawPixmapFragments(const QPainter::PixmapFragment *fragments, int fragmentCount, const QPixmap &pixmap,
QPainter::PixmapFragmentHints hints);
void drawCachedGlyphs(QFontEngine::GlyphFormat glyphFormat, QStaticTextItem *staticTextItem);
// Calls glVertexAttributePointer if the pointer has changed
inline void setVertexAttributePointer(unsigned int arrayIndex, const GLfloat *pointer);
// draws whatever is in the vertex array:
void drawVertexArrays(const float *data, int *stops, int stopCount, GLenum primitive);
void drawVertexArrays(QGL2PEXVertexArray &vertexArray, GLenum primitive) {
drawVertexArrays((const float *) vertexArray.data(), vertexArray.stops(), vertexArray.stopCount(), primitive);
}
// Composites the bounding rect onto dest buffer:
void composite(const QGLRect& boundingRect);
// Calls drawVertexArrays to render into stencil buffer:
void fillStencilWithVertexArray(const float *data, int count, int *stops, int stopCount, const QGLRect &bounds, StencilFillMode mode);
void fillStencilWithVertexArray(QGL2PEXVertexArray& vertexArray, bool useWindingFill) {
fillStencilWithVertexArray((const float *) vertexArray.data(), 0, vertexArray.stops(), vertexArray.stopCount(),
vertexArray.boundingRect(),
useWindingFill ? WindingFillMode : OddEvenFillMode);
}
void setBrush(const QBrush& brush);
void transferMode(EngineMode newMode);
bool prepareForDraw(bool srcPixelsAreOpaque); // returns true if the program has changed
bool prepareForCachedGlyphDraw(const QFontEngineGlyphCache &cache);
inline void useSimpleShader();
inline GLuint location(const QGLEngineShaderManager::Uniform uniform) {
return shaderManager->getUniformLocation(uniform);
}
void clearClip(uint value);
void writeClip(const QVectorPath &path, uint value);
void resetClipIfNeeded();
void updateClipScissorTest();
void setScissor(const QRect &rect);
void regenerateClip();
void systemStateChanged() Q_DECL_OVERRIDE;
static QGLEngineShaderManager* shaderManagerForEngine(QGL2PaintEngineEx *engine) { return engine->d_func()->shaderManager; }
static QGL2PaintEngineExPrivate *getData(QGL2PaintEngineEx *engine) { return engine->d_func(); }
static void cleanupVectorPath(QPaintEngineEx *engine, void *data);
QGL2PaintEngineEx* q;
QGLEngineShaderManager* shaderManager;
QGLPaintDevice* device;
int width, height;
QGLContext *ctx;
EngineMode mode;
QFontEngine::GlyphFormat glyphCacheFormat;
// Dirty flags
bool matrixDirty; // Implies matrix uniforms are also dirty
bool compositionModeDirty;
bool brushTextureDirty;
bool brushUniformsDirty;
bool opacityUniformDirty;
bool matrixUniformDirty;
bool translateZUniformDirty;
bool stencilClean; // Has the stencil not been used for clipping so far?
bool useSystemClip;
QRegion dirtyStencilRegion;
QRect currentScissorBounds;
uint maxClip;
QBrush currentBrush; // May not be the state's brush!
const QBrush noBrush;
QPixmap currentBrushPixmap;
QGL2PEXVertexArray vertexCoordinateArray;
QGL2PEXVertexArray textureCoordinateArray;
QVector<GLushort> elementIndices;
GLuint elementIndicesVBOId;
QDataBuffer<GLfloat> opacityArray;
GLfloat staticVertexCoordinateArray[8];
GLfloat staticTextureCoordinateArray[8];
bool snapToPixelGrid;
bool nativePaintingActive;
GLfloat pmvMatrix[3][3];
GLfloat inverseScale;
GLuint lastTextureUsed;
GLuint lastMaskTextureUsed;
bool needsSync;
bool multisamplingAlwaysEnabled;
GLfloat depthRange[2];
float textureInvertedY;
QTriangulatingStroker stroker;
QDashedStrokeProcessor dasher;
QSet<QVectorPath::CacheEntry *> pathCaches;
QVector<GLuint> unusedVBOSToClean;
QVector<GLuint> unusedIBOSToClean;
const GLfloat *vertexAttribPointers[3];
GLfloat translateZ;
};
void QGL2PaintEngineExPrivate::setVertexAttributePointer(unsigned int arrayIndex, const GLfloat *pointer)
{
Q_ASSERT(arrayIndex < 3);
if (pointer == vertexAttribPointers[arrayIndex])
return;
vertexAttribPointers[arrayIndex] = pointer;
if (arrayIndex == QT_OPACITY_ATTR)
glVertexAttribPointer(arrayIndex, 1, GL_FLOAT, GL_FALSE, 0, pointer);
else
glVertexAttribPointer(arrayIndex, 2, GL_FLOAT, GL_FALSE, 0, pointer);
}
QT_END_NAMESPACE
#endif // QPAINTENGINEEX_OPENGL2_P_H