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** Copyright (C) 2016 The Qt Company Ltd.
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** This file is part of the QtQuick module of the Qt Toolkit.
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
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** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
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****************************************************************************/

#ifndef QSGCONTEXT_H
#define QSGCONTEXT_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 <QtCore/QObject>
#include <QtCore/qabstractanimation.h>

#include <QtGui/QImage>
#include <QtGui/QSurfaceFormat>

#include <private/qtquickglobal_p.h>
#include <private/qrawfont_p.h>

#include <QtQuick/qsgnode.h>
#include <QtQuick/private/qsgdepthstencilbuffer_p.h>

QT_BEGIN_NAMESPACE

namespace QSGAtlasTexture {
    class Manager;
}

class QSGContextPrivate;
class QSGRectangleNode;
class QSGImageNode;
class QSGPainterNode;
class QSGGlyphNode;
class QSGNinePatchNode;
class QSGRenderer;
class QSGDistanceFieldGlyphCache;
class QQuickWindow;
class QSGTexture;
class QSGMaterial;
class QSGMaterialShader;
class QSGRenderLoop;
class QSGLayer;

class QOpenGLContext;
class QOpenGLFramebufferObject;

class QQuickTextureFactory;
class QSGDistanceFieldGlyphCacheManager;
class QSGContext;
class QQuickPaintedItem;

Q_DECLARE_LOGGING_CATEGORY(QSG_LOG_TIME_RENDERLOOP)
Q_DECLARE_LOGGING_CATEGORY(QSG_LOG_TIME_COMPILATION)
Q_DECLARE_LOGGING_CATEGORY(QSG_LOG_TIME_TEXTURE)
Q_DECLARE_LOGGING_CATEGORY(QSG_LOG_TIME_GLYPH)
Q_DECLARE_LOGGING_CATEGORY(QSG_LOG_TIME_RENDERER)

Q_DECLARE_LOGGING_CATEGORY(QSG_LOG_INFO)
Q_DECLARE_LOGGING_CATEGORY(QSG_LOG_RENDERLOOP)

class Q_QUICK_PRIVATE_EXPORT QSGRenderContext : public QObject
{
    Q_OBJECT
public:
    enum CreateTextureFlags {
        CreateTexture_Alpha       = 0x1,
        CreateTexture_Atlas       = 0x2,
        CreateTexture_Mipmap      = 0x4
    };

    QSGRenderContext(QSGContext *context);
    ~QSGRenderContext();

    QOpenGLContext *openglContext() const { return m_gl; }
    QSGContext *sceneGraphContext() const { return m_sg; }
    virtual bool isValid() const { return m_gl; }

    virtual void initialize(QOpenGLContext *context);
    virtual void invalidate();

    virtual void renderNextFrame(QSGRenderer *renderer, GLuint fboId);
    virtual void endSync();

    virtual QSharedPointer<QSGDepthStencilBuffer> depthStencilBufferForFbo(QOpenGLFramebufferObject *fbo);
    QSGDepthStencilBufferManager *depthStencilBufferManager();

    virtual QSGDistanceFieldGlyphCache *distanceFieldGlyphCache(const QRawFont &font);
    QSGTexture *textureForFactory(QQuickTextureFactory *factory, QQuickWindow *window);

    virtual QSGTexture *createTexture(const QImage &image, uint flags = CreateTexture_Alpha) const;

    virtual QSGRenderer *createRenderer();

    virtual void compile(QSGMaterialShader *shader, QSGMaterial *material, const char *vertexCode = 0, const char *fragmentCode = 0);
    virtual void initialize(QSGMaterialShader *shader);

    void setAttachToGLContext(bool attach);
    void registerFontengineForCleanup(QFontEngine *engine);

    static QSGRenderContext *from(QOpenGLContext *context);

    bool hasBrokenIndexBufferObjects() const { return m_brokenIBOs; }
    int maxTextureSize() const { return m_maxTextureSize; }

Q_SIGNALS:
    void initialized();
    void invalidated();

public Q_SLOTS:
    void textureFactoryDestroyed(QObject *o);

protected:
    QOpenGLContext *m_gl;
    QSGContext *m_sg;

    QMutex m_mutex;
    QHash<QQuickTextureFactory *, QSGTexture *> m_textures;
    QSet<QSGTexture *> m_texturesToDelete;
    QSGAtlasTexture::Manager *m_atlasManager;

    QSGDepthStencilBufferManager *m_depthStencilManager;
    QSGDistanceFieldGlyphCacheManager *m_distanceFieldCacheManager;

    QSet<QFontEngine *> m_fontEnginesToClean;
    int m_maxTextureSize;
    bool m_brokenIBOs;
    bool m_serializedRender;
    bool m_attachToGLContext;
};


class Q_QUICK_PRIVATE_EXPORT QSGContext : public QObject
{
    Q_OBJECT
    Q_DECLARE_PRIVATE(QSGContext)

public:
    enum AntialiasingMethod {
        UndecidedAntialiasing,
        VertexAntialiasing,
        MsaaAntialiasing
    };

    explicit QSGContext(QObject *parent = 0);
    ~QSGContext();

    virtual void renderContextInitialized(QSGRenderContext *renderContext);
    virtual void renderContextInvalidated(QSGRenderContext *renderContext);
    virtual QSGRenderContext *createRenderContext();

    QSGRectangleNode *createRectangleNode(const QRectF &rect, const QColor &c);
    virtual QSGRectangleNode *createRectangleNode();
    virtual QSGImageNode *createImageNode();
    virtual QSGPainterNode *createPainterNode(QQuickPaintedItem *item);
    virtual QSGGlyphNode *createGlyphNode(QSGRenderContext *rc, bool preferNativeGlyphNode);
    virtual QSGNinePatchNode *createNinePatchNode();
    virtual QSGLayer *createLayer(QSGRenderContext *renderContext);
    virtual QAnimationDriver *createAnimationDriver(QObject *parent);

    virtual QSize minimumFBOSize() const;
    virtual QSurfaceFormat defaultSurfaceFormat() const;

    void setDistanceFieldEnabled(bool enabled);
    bool isDistanceFieldEnabled() const;

    static QSGContext *createDefaultContext();
    static QQuickTextureFactory *createTextureFactoryFromImage(const QImage &image);
    static QSGRenderLoop *createWindowManager();
};

QT_END_NAMESPACE

#endif // QSGCONTEXT_H
