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#ifndef OPENGLVERTEXARRAYOBJECT_H
#define OPENGLVERTEXARRAYOBJECT_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of other Qt classes.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <QtGui/qopenglvertexarrayobject.h>
#include <Qt3DRender/private/graphicscontext_p.h>

QT_BEGIN_NAMESPACE

namespace Qt3DRender {
namespace Render {

class GeometryManager;
class ShaderManager;

typedef QPair<HGeometry, HShader> VAOIdentifier;

class OpenGLVertexArrayObject
{
public:
    OpenGLVertexArrayObject();

    void bind();
    void release();

    void create(GraphicsContext *ctx, const VAOIdentifier &key);
    void destroy();
    void cleanup();

    bool isAbandoned(GeometryManager *geomMgr, ShaderManager *shaderMgr);

    QOpenGLVertexArrayObject *vao() { return m_vao.data(); }
    const QOpenGLVertexArrayObject *vao() const { return m_vao.data(); }

    void setSpecified(bool b) { m_specified = b; }
    bool isSpecified() const { return m_specified; }


private:
    QMutex m_mutex;
    GraphicsContext *m_ctx;
    QScopedPointer<QOpenGLVertexArrayObject> m_vao;
    bool m_specified;
    bool m_supportsVao;
    VAOIdentifier m_owners;

    friend class GraphicsContext;

    void saveVertexAttribute(const GraphicsContext::VAOVertexAttribute &attr);
    inline void saveIndexAttribute(HGLBuffer glBufferHandle) { m_indexAttribute = glBufferHandle; }

    QVector<GraphicsContext::VAOVertexAttribute> m_vertexAttributes;
    GraphicsContext::VAOIndexAttribute m_indexAttribute;
};

} // namespace Render
} // namespace Qt3DRender

QT_END_NAMESPACE

#endif // OPENGLVERTEXARRAYOBJECT_H
