void BackBuffer::CreateReductionTargets(ID3D11Device* device)
{
// Create the staging textures for reading back the reduced depth buffer
for (uint32 i = 0; i < MaxReadbackLatency; ++i)
m_ReductionStagingTextures[i].Initialize(device, 1, 1, DXGI_FORMAT_R16G16_UNORM);
m_DepthReductionTargets.clear();
uint32 w = m_SurfaceDesc.Width;
uint32 h = m_SurfaceDesc.Height;
auto DispatchSize = [](uint32 tgSize, uint32 numElements)
{
uint32 dispatchSize = numElements / tgSize;
dispatchSize += numElements % tgSize > 0 ? 1 : 0;
return dispatchSize;
};
while (w > 1 || h > 1)
{
w = DispatchSize(ReductionTGSize, w);
h = DispatchSize(ReductionTGSize, h);
RenderTarget2D rt;
rt.Initialize(device, w, h, DXGI_FORMAT_R16G16_UNORM, 1, 1, 0, FALSE, TRUE);
m_DepthReductionTargets.push_back(rt);
}
}
void MeshRenderer::OnResize(uint32 width, uint32 height)
{
depthReductionTargets.clear();
uint32 w = width;
uint32 h = height;
while(w > 1 || h > 1)
{
w = DispatchSize(ReductionTGSize, w);
h = DispatchSize(ReductionTGSize, h);
RenderTarget2D rt;
rt.Initialize(device, w, h, DXGI_FORMAT_R16G16_UNORM, 1, 1, 0, false, true);
depthReductionTargets.push_back(rt);
}
}