TextureHandle CombineRTSSS(RenderGraph renderGraph, HDCamera hdCamera, TextureHandle rayTracedSSS, TextureHandle depthStencilBuffer, TextureHandle sssColor, TextureHandle ssgiBuffer, TextureHandle diffuseLightingBuffer, TextureHandle colorBuffer)
{
using (var builder = renderGraph.AddRenderPass <ComposeRTSSSPassData>("Composing the result of RTSSS", out var passData, ProfilingSampler.Get(HDProfileId.RaytracingSSSCompose)))
{
builder.EnableAsyncCompute(false);
passData.parameters = PrepareSSSCombineParameters(hdCamera);
passData.depthStencilBuffer = builder.UseDepthBuffer(depthStencilBuffer, DepthAccess.Read);
passData.sssColor = builder.ReadTexture(sssColor);
passData.ssgiBuffer = passData.parameters.validSSGI ? builder.ReadTexture(ssgiBuffer) : renderGraph.defaultResources.blackTextureXR;
passData.diffuseLightingBuffer = builder.ReadTexture(diffuseLightingBuffer);
passData.subsurfaceBuffer = builder.ReadTexture(rayTracedSSS);
passData.colorBuffer = builder.ReadWriteTexture(colorBuffer);
builder.SetRenderFunc(
(ComposeRTSSSPassData data, RenderGraphContext ctx) =>
{
// We need to fill the structure that holds the various resources
SSSCombineResources ssscResources = new SSSCombineResources();
ssscResources.depthStencilBuffer = data.depthStencilBuffer;
ssscResources.sssColor = data.sssColor;
ssscResources.ssgiBuffer = data.ssgiBuffer;
ssscResources.diffuseLightingBuffer = data.diffuseLightingBuffer;
ssscResources.subsurfaceBuffer = data.subsurfaceBuffer;
ssscResources.outputColorBuffer = data.colorBuffer;
ExecuteCombineSubsurfaceScattering(ctx.cmd, data.parameters, ssscResources);
});
return(passData.colorBuffer);
}
}
SSSCombineResources PrepareSSSCombineResources(RTHandle sssColor, RTHandle colorBufferRT, RTHandle diffuseLightingBuffer, RTHandle sssBuffer, bool validSSGI)
{
SSSCombineResources ssscResources = new SSSCombineResources();
// Input buffers
ssscResources.depthStencilBuffer = sharedRTManager.GetDepthStencilBuffer();
ssscResources.sssColor = sssColor;
ssscResources.ssgiBuffer = validSSGI ? m_IndirectDiffuseBuffer0 : TextureXR.GetBlackTexture();
ssscResources.diffuseLightingBuffer = diffuseLightingBuffer;
ssscResources.subsurfaceBuffer = sssBuffer;
// Output Buffers
ssscResources.outputColorBuffer = colorBufferRT;
return(ssscResources);
}
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);
}
