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

#ifndef QT3DRENDER_QBUFFER_H
#define QT3DRENDER_QBUFFER_H

#include <Qt3DRender/qabstractbuffer.h>
#include <Qt3DRender/qt3drender_global.h>
#include <QSharedPointer>

QT_BEGIN_NAMESPACE

namespace Qt3DRender {

class QBufferPrivate;
class QBufferFunctor;
typedef QSharedPointer<QBufferFunctor> QBufferFunctorPtr;

class QT3DRENDERSHARED_EXPORT QBuffer : public QAbstractBuffer
{
    Q_OBJECT
    Q_PROPERTY(BufferType type READ type WRITE setType NOTIFY typeChanged)
    Q_PROPERTY(UsageType usage READ usage WRITE setUsage NOTIFY usageChanged)
    Q_PROPERTY(bool sync READ isSync WRITE setSync NOTIFY syncChanged)

public:
    enum BufferType
    {
        VertexBuffer        = 0x8892, // GL_ARRAY_BUFFER
        IndexBuffer         = 0x8893, // GL_ELEMENT_ARRAY_BUFFER
        PixelPackBuffer     = 0x88EB, // GL_PIXEL_PACK_BUFFER
        PixelUnpackBuffer   = 0x88EC, // GL_PIXEL_UNPACK_BUFFER
        UniformBuffer       = 0x8A11, // GL_UNIFORM_BUFFER
        ShaderStorageBuffer = 0x90D2  // GL_SHADER_STORAGE_BUFFER
    };
    Q_ENUM(BufferType)

    enum UsageType
    {
        StreamDraw          = 0x88E0, // GL_STREAM_DRAW
        StreamRead          = 0x88E1, // GL_STREAM_READ
        StreamCopy          = 0x88E2, // GL_STREAM_COPY
        StaticDraw          = 0x88E4, // GL_STATIC_DRAW
        StaticRead          = 0x88E5, // GL_STATIC_READ
        StaticCopy          = 0x88E6, // GL_STATIC_COPY
        DynamicDraw         = 0x88E8, // GL_DYNAMIC_DRAW
        DynamicRead         = 0x88E9, // GL_DYNAMIC_READ
        DynamicCopy         = 0x88EA  // GL_DYNAMIC_COPY
    };
    Q_ENUM(UsageType)

    explicit QBuffer(BufferType ty = QBuffer::VertexBuffer, Qt3DCore::QNode *parent = 0);
    ~QBuffer();

    UsageType usage() const;
    BufferType type() const;
    bool isSync() const;

    void setBufferFunctor(const QBufferFunctorPtr &functor);
    QBufferFunctorPtr bufferFunctor() const;

public Q_SLOTS:
    void setType(BufferType type);
    void setUsage(UsageType usage);
    void setSync(bool sync);

protected:
    QBuffer(QBufferPrivate &dd, QBuffer::BufferType ty, Qt3DCore::QNode *parent = 0);
    void copy(const Qt3DCore::QNode *ref) Q_DECL_OVERRIDE;
    void sceneChangeEvent(const Qt3DCore::QSceneChangePtr &change) Q_DECL_OVERRIDE;

Q_SIGNALS:
    void typeChanged(BufferType type);
    void usageChanged(UsageType usage);
    void syncChanged(bool sync);

private:
    Q_DECLARE_PRIVATE(QBuffer)
    QT3D_CLONEABLE(QBuffer)
};

} // namespace Qt3DRender

QT_END_NAMESPACE

#endif // QT3DRENDER_QBUFFER_H