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#include "gpu_buffer.h"
namespace AsuraEngine
{
namespace Graphics
{
GPUBuffer::GPUBuffer(BufferType type, BufferUsage usage, size_t size)
: mTarget(GL_ZERO)
, mBuffer(GL_ZERO)
, mSize(0)
#if ASURA_DEBUG
, mData(nullptr)
#endif
{
switch (type)
{
case BUFFER_TYPE_VERTEX:
mTarget = GL_ARRAY_BUFFER;
break;
case BUFFER_TYPE_INDEX:
mTarget = GL_ELEMENT_ARRAY_BUFFER;
break;
}
switch (usage)
{
case BUFFER_USAGE_STREAM:
mUsage = GL_STREAM_DRAW;
break;
case BUFFER_USAGE_DYNAMIC:
mUsage = GL_DYNAMIC_DRAW;
break;
case BUFFER_USAGE_STATIC:
mUsage = GL_STATIC_DRAW;
break;
}
gl.WipeError();
glGenBuffers(1, &mBuffer);
if (mBuffer == 0)
throw Exception("OpenGL glGenBuffers failed.");
glBindBuffer(mTarget, mBuffer);
glBufferData(mTarget, size, NULL, mUsage); // ʼСΪsizeĻ
if (gl.HasError())
throw Exception("OpenGL glBufferData failed. Errorcode=%d.", gl.GetError());
glBindBuffer(mTarget, 0);
#if ASURA_DEBUG
mData = (byte*)malloc(size);
memset(mData, 0, size);
#endif
mSize = size;
}
GPUBuffer::~GPUBuffer()
{
#if ASURA_DEBUG
if (mData)
free(mData);
#endif
glDeleteBuffers(1, &mBuffer);
}
bool GPUBuffer::Fill(const void * data, size_t size, uint offset)
{
if (data == nullptr)
return false;
glBindBuffer(mTarget, mBuffer);
glBufferSubData(mTarget, offset, size, data);
if (gl.HasError())
throw Exception("OpenGL glBufferSubData failed. Errorcode=%d.", gl.GetError());
glBindBuffer(mTarget, 0);
#if ASURA_DEBUG
// һݣ
memcpy(mData + offset, data, size);
#endif
return true;
}
void GPUBuffer::Bind()
{
glBindBuffer(mTarget, mBuffer);
}
void GPUBuffer::UnBind()
{
glBindBuffer(mTarget, 0);
}
uint GPUBuffer::GetBufferSize()
{
return mSize;
}
}
}
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