void RenderRayTracedDirectionalScreenSpaceShadow(CommandBuffer cmd, HDCamera hdCamera)
{
// Request the intermediate buffers we shall be using
RTHandle outputShadowBuffer = GetRayTracingBuffer(InternalRayTracingBuffers.RGBA0);
RTHandle directionBuffer = GetRayTracingBuffer(InternalRayTracingBuffers.Direction);
RTHandle velocityBuffer = GetRayTracingBuffer(InternalRayTracingBuffers.R1);
RTHandle distanceBuffer = GetRayTracingBuffer(InternalRayTracingBuffers.Distance);
// Ray trace for shadow evaluation
RTShadowDirectionalTraceParameters rtsdtParams = PrepareRTShadowDirectionalTraceParameters(hdCamera, m_CurrentSunLightAdditionalLightData);
RTShadowDirectionalTraceResources rtsdtResources = PrepareSSSDirectionalTraceResources(velocityBuffer, directionBuffer, distanceBuffer, outputShadowBuffer);
ExecuteSSSDirectionalTrace(cmd, rtsdtParams, rtsdtResources);
// If required, denoise the shadow
if (m_CurrentSunLightAdditionalLightData.filterTracedShadow && rtsdtParams.softShadow)
{
DenoiseDirectionalScreenSpaceShadow(cmd, hdCamera, velocityBuffer, distanceBuffer, outputShadowBuffer);
}
// Write the result texture to the screen space shadow buffer
int dirShadowIndex = m_CurrentSunLightDirectionalLightData.screenSpaceShadowIndex & (int)LightDefinitions.s_ScreenSpaceShadowIndexMask;
WriteScreenSpaceShadowParameters wsssParams = PrepareWriteScreenSpaceShadowParameters(hdCamera, dirShadowIndex, m_CurrentSunLightAdditionalLightData.colorShadow ? ScreenSpaceShadowType.Color : ScreenSpaceShadowType.GrayScale);
WriteScreenSpaceShadowResources wsssResources = PrepareWriteScreenSpaceShadowResources(outputShadowBuffer);
ExecuteWriteScreenSpaceShadow(cmd, wsssParams, wsssResources);
}
WriteScreenSpaceShadowResources PrepareWriteScreenSpaceShadowResources(RTHandle inputShadowBuffer)
{
WriteScreenSpaceShadowResources wsssResources = new WriteScreenSpaceShadowResources();
wsssResources.inputShadowBuffer = inputShadowBuffer;
wsssResources.outputShadowArrayBuffer = m_ScreenSpaceShadowTextureArray;
return(wsssResources);
}
void WriteScreenSpaceShadow(RenderGraph renderGraph, HDCamera hdCamera, TextureHandle shadowTexture, TextureHandle screenSpaceShadowArray, int shadowIndex, ScreenSpaceShadowType shadowType)
{
// Write the result texture to the screen space shadow buffer
using (var builder = renderGraph.AddRenderPass <WriteScreenSpaceShadowPassData>("Write Screen Space Shadows", out var passData, ProfilingSampler.Get(HDProfileId.RaytracingWriteShadow)))
{
passData.parameters = PrepareWriteScreenSpaceShadowParameters(hdCamera, shadowIndex, shadowType);
passData.inputShadowBuffer = builder.ReadTexture(shadowTexture);
passData.outputShadowArrayBuffer = builder.WriteTexture(builder.ReadTexture(screenSpaceShadowArray));
builder.SetRenderFunc(
(WriteScreenSpaceShadowPassData data, RenderGraphContext context) =>
{
WriteScreenSpaceShadowResources resources = new WriteScreenSpaceShadowResources();
resources.inputShadowBuffer = data.inputShadowBuffer;
resources.outputShadowArrayBuffer = data.outputShadowArrayBuffer;
ExecuteWriteScreenSpaceShadow(context.cmd, data.parameters, resources);
});
}
}
static void ExecuteWriteScreenSpaceShadow(CommandBuffer cmd, WriteScreenSpaceShadowParameters wsssParams, WriteScreenSpaceShadowResources wsssResources)
{
// Evaluate the dispatch parameters
int shadowTileSize = 8;
int numTilesX = (wsssParams.texWidth + (shadowTileSize - 1)) / shadowTileSize;
int numTilesY = (wsssParams.texHeight + (shadowTileSize - 1)) / shadowTileSize;
// Bind the input data
cmd.SetComputeIntParam(wsssParams.screenSpaceShadowCS, HDShaderIDs._RaytracingShadowSlot, wsssParams.shadowSlot / 4);
cmd.SetComputeVectorParam(wsssParams.screenSpaceShadowCS, HDShaderIDs._RaytracingChannelMask, wsssParams.shadowChannelMask);
cmd.SetComputeVectorParam(wsssParams.screenSpaceShadowCS, HDShaderIDs._RaytracingChannelMask0, wsssParams.shadowChannelMask0);
cmd.SetComputeVectorParam(wsssParams.screenSpaceShadowCS, HDShaderIDs._RaytracingChannelMask1, wsssParams.shadowChannelMask1);
cmd.SetComputeTextureParam(wsssParams.screenSpaceShadowCS, wsssParams.shadowKernel, HDShaderIDs._RaytracedShadowIntegration, wsssResources.inputShadowBuffer);
// Bind the output texture
cmd.SetComputeTextureParam(wsssParams.screenSpaceShadowCS, wsssParams.shadowKernel, HDShaderIDs._ScreenSpaceShadowsTextureRW, wsssResources.outputShadowArrayBuffer);
//Do our copy
cmd.DispatchCompute(wsssParams.screenSpaceShadowCS, wsssParams.shadowKernel, numTilesX, numTilesY, wsssParams.viewCount);
}
