void RenderSubsurfaceScatteringRT(HDCamera hdCamera, CommandBuffer cmd, RTHandle colorBufferRT,
RTHandle diffuseBufferRT, RTHandle depthStencilBufferRT, RTHandle depthTextureRT)
{
using (new ProfilingScope(cmd, ProfilingSampler.Get(HDProfileId.SubsurfaceScattering)))
{
// Grab the SSS params
var settings = hdCamera.volumeStack.GetComponent <SubSurfaceScattering>();
// Fetch all the intermediate buffers that we need (too much of them to be fair)
RTHandle intermediateBuffer0 = GetRayTracingBuffer(InternalRayTracingBuffers.RGBA0);
RTHandle intermediateBuffer1 = GetRayTracingBuffer(InternalRayTracingBuffers.RGBA1);
RTHandle intermediateBuffer2 = GetRayTracingBuffer(InternalRayTracingBuffers.RGBA2);
RTHandle intermediateBuffer3 = GetRayTracingBuffer(InternalRayTracingBuffers.RGBA3);
RTHandle intermediateBuffer4 = GetRayTracingBuffer(InternalRayTracingBuffers.RGBA4);
RTHandle directionBuffer = GetRayTracingBuffer(InternalRayTracingBuffers.Direction);
// Evaluate the lighting for the samples that we need to
SSSRayTracingParameters sssrtParams = PrepareSSSRayTracingParameters(hdCamera, settings);
SSSRayTracingResources sssrtResources = PrepareSSSRayTracingResources(m_SSSColor,
intermediateBuffer0, intermediateBuffer1,
intermediateBuffer2, intermediateBuffer3, directionBuffer,
intermediateBuffer4);
ExecuteRTSubsurfaceScattering(cmd, sssrtParams, sssrtResources);
// Grab the history buffer
RTHandle subsurfaceHistory = hdCamera.GetCurrentFrameRT((int)HDCameraFrameHistoryType.RayTracedSubSurface)
?? hdCamera.AllocHistoryFrameRT((int)HDCameraFrameHistoryType.RayTracedSubSurface, SubSurfaceHistoryBufferAllocatorFunction, 1);
// Check if we need to invalidate the history
float historyValidity = EvaluateHistoryValidity(hdCamera);
// Apply temporal filtering to the signal
HDTemporalFilter temporalFilter = GetTemporalFilter();
TemporalFilterParameters tfParameters = temporalFilter.PrepareTemporalFilterParameters(hdCamera, false, historyValidity);
RTHandle validationBuffer = GetRayTracingBuffer(InternalRayTracingBuffers.R0);
TemporalFilterResources tfResources = temporalFilter.PrepareTemporalFilterResources(hdCamera, validationBuffer, intermediateBuffer4, subsurfaceHistory, intermediateBuffer0);
HDTemporalFilter.DenoiseBuffer(cmd, tfParameters, tfResources);
// Combine the result with the rest of the lighting
SSSCombineParameters ssscParams = PrepareSSSCombineParameters(hdCamera);
SSSCombineResources ssscResources = PrepareSSSCombineResources(m_SSSColor, colorBufferRT, diffuseBufferRT, intermediateBuffer0, ssscParams.validSSGI);
ExecuteCombineSubsurfaceScattering(cmd, ssscParams, ssscResources);
// Push this version of the texture for debug
PushFullScreenDebugTexture(hdCamera, cmd, diffuseBufferRT, FullScreenDebugMode.RayTracedSubSurface);
}
}
static void ExecuteCombineSubsurfaceScattering(CommandBuffer cmd, SSSCombineParameters ssscParams, SSSCombineResources ssscResources)
{
// Evaluate the dispatch parameters
int numTilesXHR = (ssscParams.texWidth + (s_sssTileSize - 1)) / s_sssTileSize;
int numTilesYHR = (ssscParams.texHeight + (s_sssTileSize - 1)) / s_sssTileSize;
cmd.SetComputeTextureParam(ssscParams.rayTracingSubSurfaceCS, ssscParams.combineSSSKernel, HDShaderIDs._SubSurfaceLightingBuffer, ssscResources.subsurfaceBuffer);
cmd.SetComputeTextureParam(ssscParams.rayTracingSubSurfaceCS, ssscParams.combineSSSKernel, HDShaderIDs._DiffuseLightingTextureRW, ssscResources.diffuseLightingBuffer);
cmd.SetComputeTextureParam(ssscParams.rayTracingSubSurfaceCS, ssscParams.combineSSSKernel, HDShaderIDs._SSSBufferTexture, ssscResources.sssColor);
if (ssscParams.validSSGI)
{
cmd.SetComputeTextureParam(ssscParams.rayTracingSubSurfaceCS, ssscParams.combineSSSKernel, HDShaderIDs._IndirectDiffuseLightingBuffer, ssscResources.ssgiBuffer);
}
cmd.DispatchCompute(ssscParams.rayTracingSubSurfaceCS, ssscParams.combineSSSKernel, numTilesXHR, numTilesYHR, ssscParams.viewCount);
// Combine it with the rest of the lighting
ssscParams.combineLightingMat.SetTexture(HDShaderIDs._IrradianceSource, ssscResources.diffuseLightingBuffer);
HDUtils.DrawFullScreen(cmd, ssscParams.combineLightingMat, ssscResources.outputColorBuffer, ssscResources.depthStencilBuffer, shaderPassId: 1);
}
SSSCombineParameters PrepareSSSCombineParameters(HDCamera hdCamera)
{
SSSCombineParameters ssscParams = new SSSCombineParameters();
// Camera parameters
ssscParams.texWidth = hdCamera.actualWidth;
ssscParams.texHeight = hdCamera.actualHeight;
ssscParams.viewCount = hdCamera.viewCount;
// Generation parameters
ssscParams.validSSGI = GetIndirectDiffuseMode(hdCamera) != IndirectDiffuseMode.Off;
// Required kernels
ssscParams.combineSSSKernel = ssscParams.validSSGI ? m_CombineSubSurfaceWithGIKernel : m_CombineSubSurfaceKernel;
// Other parameters
ssscParams.rayTracingSubSurfaceCS = m_Asset.renderPipelineRayTracingResources.subSurfaceRayTracingCS;
ssscParams.combineLightingMat = m_CombineLightingPass;
return(ssscParams);
}
