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#ifndef GPU_DATABUFFER_H
#define GPU_DATABUFFER_H
#include <vector>
#include "../Utilities/Type.h"
#include "../Utilities/Singleton.h"
#include "../Utilities/UtilMacros.h"
#include "../Utilities/Assert.h"
#include "OpenGL.h"
namespace GPU
{
class DataBuffer
{
public:
void Upload(int offset, int size, const void* data);
void* Map(uint32 access);
void* MapRange(int offset, int size, uint32 access); // best performance
void FlushMapedRange(int offset, int size);
void UnMap();
void Orphan();
// claim storage of size
void Restore(int size, GLenum usage);
// claim storage of size and fill it
void RestoreWithData(int size, GLenum usage, const void* data);
GET(int, Size, m_Size);
GET(GLenum, Usage, m_Usage);
GET(GLuint, Handle, m_Handle);
private:
friend class BufferPool;
DataBuffer();
~DataBuffer();
GLuint m_Handle;
int m_Size;
GLenum m_Usage;
};
// recycle data buffer
class BufferPool : public Singleton<BufferPool>
{
public:
BufferPool();
~BufferPool();
void Initialize();
DataBuffer* ClaimBuffer(int size, GLenum usage);
void ReleaseBuffer(DataBuffer* buffer);
void OnEndFrame();
private:
inline int GetSizeClassLimit(int classNdx);
void UpdatePendingBuffersArray();
void InsertToLive(DataBuffer* buffer);
uint GetSizeClass(uint bufferSize);
enum {
kSizeClassBaseLog2 = 10,
kSizeClassStepLog2 = 1,
kSizeClassCount = 7
};
std::vector<DataBuffer*> m_LiveBuffers[kSizeClassCount];
};
inline int BufferPool::GetSizeClassLimit(int classNdx)
{
// (0, 2^10] 2^11 2^12 2^13 2^14 2^15 INT_MAX
return classNdx + 1 < kSizeClassCount ? (1 << (classNdx*kSizeClassStepLog2 + kSizeClassBaseLog2)) : INT_MAX;
}
DataBuffer* ClaimBuffer(int size = 0, GLenum usage = GL_ARRAY_BUFFER);
void ReleaseBuffer(DataBuffer* buffer);
}
#endif
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