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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
** General Public License version 2.0 or (at your option) the GNU General
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****************************************************************************/

#ifndef QSGABSTRACTRENDERER_H
#define QSGABSTRACTRENDERER_H

#include <QtQuick/qsgnode.h>

#ifndef GLuint
#define GLuint uint
#endif

QT_BEGIN_NAMESPACE

class QSGAbstractRendererPrivate;

class Q_QUICK_EXPORT QSGAbstractRenderer : public QObject
{
    Q_OBJECT
public:
    enum ClearModeBit
    {
        ClearColorBuffer    = 0x0001,
        ClearDepthBuffer    = 0x0002,
        ClearStencilBuffer  = 0x0004
    };
    Q_DECLARE_FLAGS(ClearMode, ClearModeBit)
    Q_FLAG(ClearMode)

    ~QSGAbstractRenderer() override;

    void setRootNode(QSGRootNode *node);
    QSGRootNode *rootNode() const;
    void setDeviceRect(const QRect &rect);
    inline void setDeviceRect(const QSize &size) { setDeviceRect(QRect(QPoint(), size)); }
    QRect deviceRect() const;

    void setViewportRect(const QRect &rect);
    inline void setViewportRect(const QSize &size) { setViewportRect(QRect(QPoint(), size)); }
    QRect viewportRect() const;

    void setProjectionMatrixToRect(const QRectF &rect);
    void setProjectionMatrix(const QMatrix4x4 &matrix);
    QMatrix4x4 projectionMatrix() const;

    void setClearColor(const QColor &color);
    QColor clearColor() const;

    void setClearMode(ClearMode mode);
    ClearMode clearMode() const;

    virtual void renderScene(GLuint fboId = 0) = 0;

Q_SIGNALS:
    void sceneGraphChanged();

protected:
    explicit QSGAbstractRenderer(QObject *parent = nullptr);
    virtual void nodeChanged(QSGNode *node, QSGNode::DirtyState state) = 0;

private:
    Q_DECLARE_PRIVATE(QSGAbstractRenderer)
    friend class QSGRootNode;
};

Q_DECLARE_OPERATORS_FOR_FLAGS(QSGAbstractRenderer::ClearMode)

QT_END_NAMESPACE

#endif
