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#pragma once
#include <vector>
#include "Runtime/Lua/LuaHelper.h"
#include "../Utilities/Type.h"
#include "../Utilities/Singleton.h"
#include "../Utilities/UtilMacros.h"
#include "../Utilities/Assert.h"
#include "OpenGL.h"
template<typename T>
// GPU侧的通用缓冲区，最底层的实现
class GPUDataBuffer
{
public:
GPUDataBuffer(GLenum target, GLenum usage)/*throw GLException*/
: m_Target(target)
, m_Usage(usage)
{
glGenBuffers(1, &m_Handle);
CheckGLError(
glDeleteBuffers(1, &m_Handle);
throw GLException(error);
);
}
virtual ~GPUDataBuffer()
{
glDeleteBuffers(1, &m_Handle);
}
// 提交\更新缓冲区数据
void Upload(int offset, int size, const T* data)
{
glBindBuffer(m_Target, m_Handle);
glBufferSubData(m_Target, offset, size, data);
glBindBuffer(m_Target, 0);
}
// 更新缓冲区数据（性能优于Upload）
T* Map(uint32 access)
{
glBindBuffer(m_Target, m_Handle);
void* ptr = glMapBuffer(m_Target, access);
glBindBuffer(m_Target, 0);
return ptr;
}
T* MapRange(int offset, int size, uint32 access) // 性能最佳
{
glBindBuffer(m_Target, m_Handle);
void* ptr = glMapBufferRange(m_Target, offset, size, access);
glBindBuffer(m_Target, 0);
return ptr;
}
void FlushMapedRange(int offset, int size)
{
glBindBuffer(m_Target, m_Handle);
glFlushMappedBufferRange(m_Target, offset, size);
glBindBuffer(m_Target, 0);
}
void UnMap()
{
glBindBuffer(m_Target, m_Handle);
glUnmapBuffer(m_Target);
glBindBuffer(m_Target, 0);
}
// 重置缓冲区
void Restore(int size, GLenum usage)
{
RestoreWithData(size, usage, 0);
}
void RestoreWithData(int size, GLenum usage, const T* data)
{
glBindBuffer(m_Target, m_Handle);
glBufferData(m_Target, size, data, usage);
glBindBuffer(m_Target, 0);
m_Size = size;
m_Usage = usage;
}
void Orphan()
{
glBindBuffer(m_Target, m_Handle);
glBufferData(m_Target, 0, 0, GL_STREAM_DRAW);
glBindBuffer(m_Target, 0);
}
int GetComponentSize()
{
return sizeof(T);
}
GET(int, Size, m_Size);
GET(GLenum, Usage, m_Usage);
GET(GLuint, Handle, m_Handle);
protected:
GLuint m_Handle;
GLenum m_Target;
GLenum m_Usage;
int m_Size;
};
struct VertexAttributeDescriptor
{
int index; // attribute layout index //glBindAttribLocation
int numOfComponents; // 1,2,3,4
int stride;
};
struct VertexDataLayout
{
std::vector<VertexAttributeDescriptor> attributes;
};
class DynamicVBO;
//顶点数据流
class VBO : public GPUDataBuffer<float>
{
public:
VBO();
virtual ~VBO();
void AddVertexAttribute(int index, int numOfComps, int stride);
void AddVertexAttribute(VertexAttributeDescriptor& attribute);
int GetVertexAttributesCount();
void ClearVertexAttribute();
static const GLenum componentType = GL_FLOAT;
protected:
friend class DynamicVBO;
VBO(GLenum usage);
VertexDataLayout m_Layout;
};
// 频繁读写的共享vbo
class DynamicVBO : public VBO
{
public:
DynamicVBO();
~DynamicVBO();
};
// 索引数据流
class IBO : GPUDataBuffer<UInt16>
{
public:
static const GLenum componentType = GL_UNSIGNED_SHORT;
};
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