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#ifndef __ASURA_GPU_BUFFER_H__
#define __ASURA_GPU_BUFFER_H__
#include <asura-utils/scripting/portable.hpp>
#include <asura-utils/exceptions/exception.h>
#include <asura-utils/type.h>
#include "gl.h"
namespace AsuraEngine
{
namespace Graphics
{
enum BufferType
{
BUFFER_TYPE_VERTEX, ///< 㻺壬position\tangent\normal\color\texcoord(n)
BUFFER_TYPE_INDEX, ///<
};
enum BufferUsage
{
BUFFER_USAGE_STREAM, ///< һΣʹô
BUFFER_USAGE_DYNAMIC, ///< һΣʹ
BUFFER_USAGE_STATIC, ///< ĺʹ
};
enum BufferDataType
{
BUFFER_DATA_TYPE_INT,
BUFFER_DATA_TYPE_FLOAT,
BUFFER_DATA_TYPE_UNSIGNED_BYTE,
};
///
/// VRAM壬ֶ㻺vboebo֣ÿζڴԴϴݡ
///
ASURA_ABSTRACT class GPUBuffer
{
public:
GPUBuffer(BufferType type, BufferUsage usage, BufferDataType datatype, size_t size);
virtual ~GPUBuffer();
static size_t GetDataTypeSize(GLenum datatype);
///
/// ʼ\»棬ûgpu bufferԴΪdzʼΪǸ¡
///
bool Fill(const void* data, size_t size, uint offset = 0) ASURA_THROW(Exception);
///
/// ӦĿϣͿʹˡ
///
void Bind();
void UnBind();
///
/// bufferĴС(Byte)
///
uint GetBufferSize();
///
/// bufferԪظ=size/datatypesize
///
uint GetBufferCount();
GLenum GetDataType();
size_t GetDataTypeSize();
private:
//----------------------------------------------------------------------------//
LUAX_DECL_ABSTRACT_FACTORY(GPUBuffer);
LUAX_DECL_ENUM(BufferType, 1);
LUAX_DECL_ENUM(BufferUsage, 1);
LUAX_DECL_ENUM(BufferDataType, 2);
LUAX_DECL_METHOD(_Fill);
LUAX_DECL_METHOD(_GetSize);
LUAX_DECL_METHOD(_GetCount);
//----------------------------------------------------------------------------//
GLenum ConvertBufferType(BufferType type);
GLenum ConvertBufferUsage(BufferUsage type);
GLenum ConvertBufferDataType(BufferDataType type);
GLenum mTarget;
GLuint mBuffer;
///
/// openglԴ滺岢ûж͵ҪֻglVertexAttribPointerʱָ
/// drawcall ʱݸʼַʹbufferȡඥݣԲͬ
/// ԱһbufferСΪ˱ֽӿڵļ࣬ڳʼbufferʱָ
/// ͣڱ͵һ£Բͬͷͬbuffer
///
GLenum mDataType;
GLuint mUsage;
uint mSize;
#if ASURA_DEBUG
///
/// رbufferݣԴݱһ£ԺԴ档
///
byte* mData;
#endif
};
}
}
#endif
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