cpuGLVertexBuffer.h

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//
//   Copyright 2013 Pixar
//
//   Licensed under the terms set forth in the LICENSE.txt file available at
//   https://opensubdiv.org/license.
//
 
#ifndef OPENSUBDIV3_OSD_CPU_GL_VERTEX_BUFFER_H
#define OPENSUBDIV3_OSD_CPU_GL_VERTEX_BUFFER_H
 
#include "../version.h"
 
#include <cstddef>
 
namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {
 
namespace Osd {

class CpuGLVertexBuffer {
public:
    using ID = unsigned int;    // GLuint resource ID

    static CpuGLVertexBuffer * Create(int numElements, int numVertices,
                                      void *deviceContext = NULL);

    ~CpuGLVertexBuffer();

    void UpdateData(const float *src, int startVertex, int numVertices,
                    void *deviceContext = NULL);

    int GetNumElements() const;

    int GetNumVertices() const;

    float * BindCpuBuffer();

    ID BindVBO(void *deviceContext = NULL);
 
protected:
    CpuGLVertexBuffer(int numElements, int numVertices);

    bool allocate();
 
private:
    int _numElements;
    int _numVertices;
    ID _vbo;
    float *_cpuBuffer;
    bool _dataDirty;
};
 
}  // end namespace Osd
 
}  // end namespace OPENSUBDIV_VERSION
using namespace OPENSUBDIV_VERSION;
 
}  // end namespace OpenSubdiv
 
#endif  // OPENSUBDIV3_OSD_CPU_GL_VERTEX_BUFFER_H