ID3D11BlendState *Clear11::getBlendState(const std::vector<MaskedRenderTarget>& rts)
{
ClearBlendInfo blendKey = { 0 };
for (unsigned int i = 0; i < D3D11_SIMULTANEOUS_RENDER_TARGET_COUNT; i++)
{
if (i < rts.size())
{
RenderTarget11 *rt = rts[i].renderTarget;
const gl::InternalFormat &formatInfo = gl::GetInternalFormatInfo(rt->getInternalFormat());
blendKey.maskChannels[i][0] = (rts[i].colorMask[0] && formatInfo.redBits > 0);
blendKey.maskChannels[i][1] = (rts[i].colorMask[1] && formatInfo.greenBits > 0);
blendKey.maskChannels[i][2] = (rts[i].colorMask[2] && formatInfo.blueBits > 0);
blendKey.maskChannels[i][3] = (rts[i].colorMask[3] && formatInfo.alphaBits > 0);
}
else
{
blendKey.maskChannels[i][0] = false;
blendKey.maskChannels[i][1] = false;
blendKey.maskChannels[i][2] = false;
blendKey.maskChannels[i][3] = false;
}
}
ClearBlendStateMap::const_iterator i = mClearBlendStates.find(blendKey);
if (i != mClearBlendStates.end())
{
return i->second;
}
else
{
D3D11_BLEND_DESC blendDesc = { 0 };
blendDesc.AlphaToCoverageEnable = FALSE;
blendDesc.IndependentBlendEnable = (rts.size() > 1) ? TRUE : FALSE;
for (unsigned int j = 0; j < D3D11_SIMULTANEOUS_RENDER_TARGET_COUNT; j++)
{
blendDesc.RenderTarget[j].BlendEnable = FALSE;
blendDesc.RenderTarget[j].RenderTargetWriteMask = gl_d3d11::ConvertColorMask(blendKey.maskChannels[j][0],
blendKey.maskChannels[j][1],
blendKey.maskChannels[j][2],
blendKey.maskChannels[j][3]);
}
ID3D11Device *device = mRenderer->getDevice();
ID3D11BlendState* blendState = NULL;
HRESULT result = device->CreateBlendState(&blendDesc, &blendState);
if (FAILED(result) || !blendState)
{
ERR("Unable to create a ID3D11BlendState, HRESULT: 0x%X.", result);
return NULL;
}
mClearBlendStates[blendKey] = blendState;
return blendState;
}
}
