TextureHandle UpscaleSSGI(RenderGraph renderGraph, HDCamera hdCamera, GlobalIllumination giSettings, HDUtils.PackedMipChainInfo info, TextureHandle depthPyramid, TextureHandle inputBuffer)
{
using (var builder = renderGraph.AddRenderPass <UpscaleSSGIPassData>("Upscale SSGI", out var passData, ProfilingSampler.Get(HDProfileId.SSGIUpscale)))
{
builder.EnableAsyncCompute(false);
passData.parameters = PrepareSSGIUpscaleParameters(hdCamera, giSettings, info);
passData.depthTexture = builder.ReadTexture(depthPyramid);
passData.inputBuffer = builder.ReadTexture(inputBuffer);
passData.outputBuffer = builder.WriteTexture(renderGraph.CreateTexture(new TextureDesc(Vector2.one, true, true)
{
colorFormat = GraphicsFormat.R16G16B16A16_SFloat, enableRandomWrite = true, name = "SSGI Final"
}));
builder.SetRenderFunc(
(UpscaleSSGIPassData data, RenderGraphContext ctx) =>
{
// We need to fill the structure that holds the various resources
SSGIUpscaleResources resources = new SSGIUpscaleResources();
resources.depthTexture = data.depthTexture;
resources.inputBuffer = data.inputBuffer;
resources.outputBuffer = data.outputBuffer;
ExecuteSSGIUpscale(ctx.cmd, data.parameters, resources);
});
return(passData.outputBuffer);
}
}
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 buffer0, buffer1;
if (giSettings.fullResolutionSS)
{
buffer0 = m_IndirectDiffuseBuffer0;
buffer1 = m_IndirectDiffuseBuffer1;
}
else
{
buffer0 = m_IndirectDiffuseBuffer1;
buffer1 = m_IndirectDiffuseBuffer0;
}
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, buffer0, m_IndirectDiffuseHitPointBuffer);
ExecuteSSGITrace(cmd, parameters, resources);
}
// Denoise it
using (new ProfilingScope(cmd, ProfilingSampler.Get(HDProfileId.SSGIDenoise)))
{
float historyValidity = EvaluateHistoryValidity(hdCamera);
SSGIDenoiser ssgiDenoiser = GetSSGIDenoiser();
ssgiDenoiser.Denoise(cmd, hdCamera, buffer0, buffer1, halfResolution: !giSettings.fullResolutionSS, historyValidity: historyValidity);
}
// 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);
SSGIUpscaleResources resources = PrepareSSGIUpscaleResources(hdCamera, buffer0, buffer1);
ExecuteSSGIUpscale(cmd, parameters, resources);
}
}
(RenderPipelineManager.currentPipeline as HDRenderPipeline).PushFullScreenDebugTexture(hdCamera, cmd, m_IndirectDiffuseBuffer0, FullScreenDebugMode.ScreenSpaceGlobalIllumination);
}
}
SSGIUpscaleResources PrepareSSGIUpscaleResources(HDCamera hdCamera, RTHandle inputBuffer, RTHandle outputBuffer)
{
SSGIUpscaleResources ssgiUpscaleResources = new SSGIUpscaleResources();
// Input buffers
ssgiUpscaleResources.depthTexture = m_SharedRTManager.GetDepthTexture();
ssgiUpscaleResources.inputBuffer = inputBuffer;
// Output buffers
ssgiUpscaleResources.outputBuffer = outputBuffer;
return(ssgiUpscaleResources);
}
static void ExecuteSSGIUpscale(CommandBuffer cmd, SSGIUpscaleParameters parameters, SSGIUpscaleResources 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;
// Inject the input scalars
cmd.SetComputeVectorParam(parameters.bilateralUpsampleCS, HDShaderIDs._HalfScreenSize, parameters.halfScreenSize);
cmd.SetComputeVectorParam(parameters.bilateralUpsampleCS, HDShaderIDs._DepthPyramidFirstMipLevelOffset, parameters.firstMipOffset);
// Inject all the input buffers
cmd.SetComputeTextureParam(parameters.bilateralUpsampleCS, parameters.upscaleKernel, HDShaderIDs._DepthTexture, resources.depthTexture);
cmd.SetComputeTextureParam(parameters.bilateralUpsampleCS, parameters.upscaleKernel, HDShaderIDs._LowResolutionTexture, resources.inputBuffer);
// Inject the output textures
cmd.SetComputeTextureParam(parameters.bilateralUpsampleCS, parameters.upscaleKernel, HDShaderIDs._OutputUpscaledTexture, resources.outputBuffer);
// Upscale the buffer to full resolution
cmd.DispatchCompute(parameters.bilateralUpsampleCS, parameters.upscaleKernel, numTilesXHR, numTilesYHR, parameters.viewCount);
}