qt-everywhere-src-5.15.1/qtquick3d/src/render/qssgrendervertexbuffer_p.h

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#ifndef QSSG_RENDER_VERTEX_BUFFER_H
#define QSSG_RENDER_VERTEX_BUFFER_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 <QtQuick3DRender/private/qssgrenderdatabuffer_p.h>

QT_BEGIN_NAMESPACE

// forward declaration
class QSSGRenderContext;

///< Vertex buffer representation
class Q_QUICK3DRENDER_EXPORT QSSGRenderVertexBuffer : public QSSGRenderDataBuffer
{
public:
    /**
     * @brief constructor
     *
     * @param[in] context		Pointer to context
     * @param[in] entries		Vertex buffer attribute layout entries
     * @param[in] size			Size of the buffer
     * @param[in] bindFlags		Where to binf this buffer (e.g. vertex, index, ...)
     *							For OpenGL this should be a single
     *value
     * @param[in] usage			Usage of the buffer (e.g. static, dynamic...)
     * @param[in] data			A pointer to the buffer data that is allocated by the
     *application.
     *
     * @return No return.
     */
    QSSGRenderVertexBuffer(const QSSGRef<QSSGRenderContext> &context,
                             QSSGRenderBufferUsageType usageType,
                             quint32 stride,
                             QSSGByteView data);

    ///< destructor
    virtual ~QSSGRenderVertexBuffer() override;

    /**
     * @brief return vertex data stride
     *
     * @return data stride.
     */
    quint32 stride() const { return m_stride; }

    /**
     * @brief get vertex count
     *
     * @return vertex count
     */
    quint32 numVertexes() const
    {
        Q_ASSERT((m_bufferCapacity % m_stride) == 0);
        return m_bufferCapacity / m_stride;
    }

    /**
     * @brief bind the buffer bypasses the context state
     *
     * @return no return.
     */
    void bind() override;

private:
    quint32 m_stride;
};

QT_END_NAMESPACE

#endif