gl::Error VertexBuffer11::getSpaceRequired(const gl::VertexAttribute &attrib, GLsizei count,
GLsizei instances, unsigned int *outSpaceRequired) const
{
unsigned int elementCount = 0;
if (attrib.enabled)
{
if (instances == 0 || attrib.divisor == 0)
{
elementCount = count;
}
else
{
// Round up to divisor, if possible
elementCount = UnsignedCeilDivide(static_cast<unsigned int>(instances), attrib.divisor);
}
gl::VertexFormatType formatType = gl::GetVertexFormatType(attrib);
const D3D_FEATURE_LEVEL featureLevel = mRenderer->getRenderer11DeviceCaps().featureLevel;
const d3d11::VertexFormat &vertexFormatInfo = d3d11::GetVertexFormatInfo(formatType, featureLevel);
const d3d11::DXGIFormat &dxgiFormatInfo = d3d11::GetDXGIFormatInfo(vertexFormatInfo.nativeFormat);
unsigned int elementSize = dxgiFormatInfo.pixelBytes;
if (elementSize <= std::numeric_limits<unsigned int>::max() / elementCount)
{
if (outSpaceRequired)
{
*outSpaceRequired = elementSize * elementCount;
}
return gl::Error(GL_NO_ERROR);
}
else
{
return gl::Error(GL_OUT_OF_MEMORY, "New vertex buffer size would result in an overflow.");
}
}
else
{
const unsigned int elementSize = 4;
if (outSpaceRequired)
{
*outSpaceRequired = elementSize * 4;
}
return gl::Error(GL_NO_ERROR);
}
}
gl::Error VertexBuffer9::spaceRequired(const gl::VertexAttribute &attrib, std::size_t count, GLsizei instances,
unsigned int *outSpaceRequired) const
{
gl::VertexFormat vertexFormat(attrib, GL_FLOAT);
const d3d9::VertexFormat &d3d9VertexInfo = d3d9::GetVertexFormatInfo(mRenderer->getCapsDeclTypes(), vertexFormat);
if (attrib.enabled)
{
unsigned int elementCount = 0;
if (instances == 0 || attrib.divisor == 0)
{
elementCount = count;
}
else
{
// Round up to divisor, if possible
elementCount = UnsignedCeilDivide(static_cast<unsigned int>(instances), attrib.divisor);
}
if (d3d9VertexInfo.outputElementSize <= std::numeric_limits<unsigned int>::max() / elementCount)
{
if (outSpaceRequired)
{
*outSpaceRequired = d3d9VertexInfo.outputElementSize * elementCount;
}
return gl::Error(GL_NO_ERROR);
}
else
{
return gl::Error(GL_OUT_OF_MEMORY, "New vertex buffer size would result in an overflow.");
}
}
else
{
const unsigned int elementSize = 4;
if (outSpaceRequired)
{
*outSpaceRequired = elementSize * 4;
}
return gl::Error(GL_NO_ERROR);
}
}