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);
}
WriteScreenSpaceShadowParameters PrepareWriteScreenSpaceShadowParameters(HDCamera hdCamera, int shadowSlot, ScreenSpaceShadowType shadowType)
{
WriteScreenSpaceShadowParameters wsssParams = new WriteScreenSpaceShadowParameters();
// Set the camera parameters
wsssParams.texWidth = hdCamera.actualWidth;
wsssParams.texHeight = hdCamera.actualHeight;
wsssParams.viewCount = hdCamera.viewCount;
// Evaluation parameters
GetShadowChannelMask(shadowSlot, shadowType, ref wsssParams.shadowChannelMask);
// If the light is an area, we also need to grab the individual channels
if (shadowType == ScreenSpaceShadowType.Area)
{
GetShadowChannelMask(shadowSlot, ScreenSpaceShadowType.GrayScale, ref wsssParams.shadowChannelMask0);
GetShadowChannelMask(shadowSlot + 1, ScreenSpaceShadowType.GrayScale, ref wsssParams.shadowChannelMask1);
}
wsssParams.shadowSlot = shadowSlot;
// Kernel
switch (shadowType)
{
case ScreenSpaceShadowType.GrayScale:
{
wsssParams.shadowKernel = m_OutputShadowTextureKernel;
}
break;
case ScreenSpaceShadowType.Area:
{
wsssParams.shadowKernel = m_OutputSpecularShadowTextureKernel;
}
break;
case ScreenSpaceShadowType.Color:
{
wsssParams.shadowKernel = m_OutputColorShadowTextureKernel;
}
break;
}
// Other parameters
wsssParams.screenSpaceShadowCS = m_ScreenSpaceShadowsCS;
return(wsssParams);
}
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.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);
}
WriteScreenSpaceShadowParameters PrepareWriteScreenSpaceShadowParameters(HDCamera hdCamera, int shadowSlot, ScreenSpaceShadowType shadowType)
{
WriteScreenSpaceShadowParameters wsssParams = new WriteScreenSpaceShadowParameters();
// Set the camera parameters
wsssParams.texWidth = hdCamera.actualWidth;
wsssParams.texHeight = hdCamera.actualHeight;
wsssParams.viewCount = hdCamera.viewCount;
// Evaluation parameters
GetShadowChannelMask(shadowSlot, shadowType, ref wsssParams.shadowChannelMask);
wsssParams.shadowSlot = shadowSlot;
// Kernel
wsssParams.shadowKernel = (shadowType == ScreenSpaceShadowType.Color ? m_OutputColorShadowTextureKernel : m_OutputShadowTextureKernel);
// Other parameters
wsssParams.screenSpaceShadowCS = m_ScreenSpaceShadowsCS;
return(wsssParams);
}
