void OGL4GeometryData::AttachIndexBuffer(GPUBufferPtr pBuffer, G_FORMAT format)
{
if(m_pIndexBuffer)
{
m_pIndexBuffer->Release();
}
m_pIndexBuffer = pBuffer;
switch(format)
{
case G_FORMAT_R32_UINT:
m_indexType = GL_UNSIGNED_INT;
m_indexElementBytes = 4;
break;
case G_FORMAT_R16_UINT:
m_indexType = GL_UNSIGNED_SHORT;
m_indexElementBytes = 2;
break;
default:
assert(0);
m_indexType = GL_UNSIGNED_SHORT;
m_indexElementBytes = 2;
break;
}
OGL4BufferPtr pOGLBuffer = std::dynamic_pointer_cast<OGL4Buffer>(m_pIndexBuffer);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, pOGLBuffer->GetBufferObject());
}
void OGL4GeometryData::CommitModify()
{
glBindVertexArray(m_vao);
OGL4BufferPtr pOGLBuffer = std::dynamic_pointer_cast<OGL4Buffer>(m_pVertexBuffer);
glBindBuffer(GL_ARRAY_BUFFER, pOGLBuffer->GetBufferObject());
pOGLBuffer = std::dynamic_pointer_cast<OGL4Buffer>(m_pIndexBuffer);
if(pOGLBuffer)
{
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, pOGLBuffer->GetBufferObject());
}
glBindVertexArray(0);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
}
void OGL4GeometryData::SetVertexLayout(const VertexLayout& layout)
{
m_layout = layout;
unsigned int stride = m_layout.VertexStride();
OGL4BufferPtr pOGLBuffer = std::dynamic_pointer_cast<OGL4Buffer>(m_pVertexBuffer);
glBindBuffer(GL_ARRAY_BUFFER, pOGLBuffer->GetBufferObject());
unsigned int offset = 0;
for(unsigned int i = 0; i < m_layout.AttrCount(); ++i)
{
glEnableVertexAttribArray(i);
G_FORMAT type = m_layout.AttrType(i);
unsigned int value_count = 0;
GLenum gltype = GL_INVALID_ENUM;
if(OGL4Convert::FormatToGLVertexAttr(type, value_count, gltype) == false)
{
assert(0);
}
switch(gltype)
{
case GL_INT:
case GL_UNSIGNED_INT:
glVertexAttribIPointer(i, value_count, gltype, stride, (GLvoid*)(m_vbOffset + offset));
break;
default:
glVertexAttribPointer(i, value_count, gltype, GL_FALSE, stride, (GLvoid*)(m_vbOffset + offset));
break;
}
offset += m_layout.TypeBytes(type);
}
}
