void RenderSSGI(HDCamera hdCamera, CommandBuffer cmd, ScriptableRenderContext renderContext, int frameCount)
{
// Grab the global illumination volume component
GlobalIllumination giSettings = hdCamera.volumeStack.GetComponent <GlobalIllumination>();
// Based on if we are doing it in half resolution or full, we need to define initial and final buffer to avoid a useless blit
RTHandle buffer00, buffer01, buffer10, buffer11;
if (giSettings.fullResolutionSS)
{
buffer00 = m_IndirectDiffuseBuffer0;
buffer01 = m_IndirectDiffuseBuffer1;
buffer10 = m_IndirectDiffuseBuffer2;
buffer11 = m_IndirectDiffuseBuffer3;
}
else
{
buffer00 = m_IndirectDiffuseBuffer2;
buffer01 = m_IndirectDiffuseBuffer3;
buffer10 = m_IndirectDiffuseBuffer0;
buffer11 = m_IndirectDiffuseBuffer1;
}
using (new ProfilingScope(cmd, ProfilingSampler.Get(HDProfileId.SSGIPass)))
{
// Trace the signal
using (new ProfilingScope(cmd, ProfilingSampler.Get(HDProfileId.SSGITrace)))
{
SSGITraceParameters parameters = PrepareSSGITraceParameters(hdCamera, giSettings);
SSGITraceResources resources = PrepareSSGITraceResources(hdCamera, buffer00, buffer01, m_IndirectDiffuseHitPointBuffer);
ExecuteSSGITrace(cmd, parameters, resources);
}
// Denoise it
using (new ProfilingScope(cmd, ProfilingSampler.Get(HDProfileId.SSGIDenoise)))
{
// Evaluate the history validity
float historyValidity = EvaluateIndirectDiffuseHistoryValidity(hdCamera, giSettings.fullResolutionSS, false);
SSGIDenoiser ssgiDenoiser = GetSSGIDenoiser();
ssgiDenoiser.Denoise(cmd, hdCamera, buffer00, buffer01, buffer10, buffer11, halfResolution: !giSettings.fullResolutionSS, historyValidity: historyValidity);
// Propagate the history
PropagateIndirectDiffuseHistoryValidity(hdCamera, giSettings.fullResolutionSS, false);
}
// Convert it
using (new ProfilingScope(cmd, ProfilingSampler.Get(HDProfileId.SSGIConvert)))
{
SSGIConvertParameters parameters = PrepareSSGIConvertParameters(hdCamera, !giSettings.fullResolutionSS);
SSGIConvertResources resources = PrepareSSGIConvertResources(hdCamera, buffer00, buffer01);
ExecuteSSGIConversion(cmd, parameters, resources);
}
// Upscale it if required
// If this was a half resolution effect, we still have to upscale it
if (!giSettings.fullResolutionSS)
{
using (new ProfilingScope(cmd, ProfilingSampler.Get(HDProfileId.SSGIUpscale)))
{
ComputeShader bilateralUpsampleCS = m_Asset.renderPipelineResources.shaders.bilateralUpsampleCS;
SSGIUpscaleParameters parameters = PrepareSSGIUpscaleParameters(hdCamera, giSettings, m_SharedRTManager.GetDepthBufferMipChainInfo());
SSGIUpscaleResources resources = PrepareSSGIUpscaleResources(hdCamera, buffer00, buffer10);
ExecuteSSGIUpscale(cmd, parameters, resources);
}
}
(RenderPipelineManager.currentPipeline as HDRenderPipeline).PushFullScreenDebugTexture(hdCamera, cmd, m_IndirectDiffuseBuffer0, FullScreenDebugMode.ScreenSpaceGlobalIllumination);
}
}
static void ExecuteSSGIConversion(CommandBuffer cmd, SSGIConvertParameters parameters, SSGIConvertResources resources)
{
// Re-evaluate the dispatch parameters (we are evaluating the upsample in full resolution)
int ssgiTileSize = 8;
int numTilesXHR = (parameters.texWidth + (ssgiTileSize - 1)) / ssgiTileSize;
int numTilesYHR = (parameters.texHeight + (ssgiTileSize - 1)) / ssgiTileSize;
cmd.SetComputeTextureParam(parameters.ssGICS, parameters.convertKernel, HDShaderIDs._DepthTexture, resources.depthTexture);
cmd.SetComputeTextureParam(parameters.ssGICS, parameters.convertKernel, HDShaderIDs._NormalBufferTexture, resources.normalBuffer);
cmd.SetComputeBufferParam(parameters.ssGICS, parameters.convertKernel, HDShaderIDs._DepthPyramidMipLevelOffsets, parameters.offsetBuffer);
cmd.SetComputeTextureParam(parameters.ssGICS, parameters.convertKernel, HDShaderIDs._IndirectDiffuseTexture0RW, resources.inoutBuffer0);
cmd.SetComputeTextureParam(parameters.ssGICS, parameters.convertKernel, HDShaderIDs._IndirectDiffuseTexture1, resources.inputBufer1);
cmd.SetComputeTextureParam(parameters.ssGICS, parameters.convertKernel, HDShaderIDs._StencilTexture, resources.stencilBuffer, 0, RenderTextureSubElement.Stencil);
cmd.SetComputeIntParams(parameters.ssGICS, HDShaderIDs._SsrStencilBit, (int)StencilUsage.TraceReflectionRay);
cmd.DispatchCompute(parameters.ssGICS, parameters.convertKernel, numTilesXHR, numTilesYHR, parameters.viewCount);
}
