static void TraceVolumetricClouds_Sky_Low(CommandBuffer cmd, VolumetricCloudsSkyLowPassData passData, MaterialPropertyBlock mpb)
{
// Compute the number of tiles to evaluate
int traceTX = (passData.traceWidth + (8 - 1)) / 8;
int traceTY = (passData.traceHeight + (8 - 1)) / 8;
// Bind the sampling textures
BlueNoise.BindDitheredTextureSet(cmd, passData.commonData.ditheredTextureSet);
// Bind the constant buffer
ConstantBuffer.Push(cmd, passData.commonData.cloudsCB, passData.commonData.volumetricCloudsCS, HDShaderIDs._ShaderVariablesClouds);
CoreUtils.SetKeyword(cmd, "LOCAL_VOLUMETRIC_CLOUDS", false);
// Ray-march the clouds for this frame
CoreUtils.SetKeyword(cmd, "PHYSICALLY_BASED_SUN", passData.commonData.cloudsCB._PhysicallyBasedSun == 1);
cmd.SetComputeTextureParam(passData.commonData.volumetricCloudsCS, passData.renderKernel, HDShaderIDs._MaxZMaskTexture, passData.maxZMask);
cmd.SetComputeTextureParam(passData.commonData.volumetricCloudsCS, passData.renderKernel, HDShaderIDs._Worley128RGBA, passData.commonData.worley128RGBA);
cmd.SetComputeTextureParam(passData.commonData.volumetricCloudsCS, passData.renderKernel, HDShaderIDs._ErosionNoise, passData.commonData.erosionNoise);
cmd.SetComputeTextureParam(passData.commonData.volumetricCloudsCS, passData.renderKernel, HDShaderIDs._CloudMapTexture, passData.commonData.cloudMapTexture);
cmd.SetComputeTextureParam(passData.commonData.volumetricCloudsCS, passData.renderKernel, HDShaderIDs._CloudLutTexture, passData.commonData.cloudLutTexture);
cmd.SetComputeBufferParam(passData.commonData.volumetricCloudsCS, passData.renderKernel, HDShaderIDs._VolumetricCloudsAmbientProbeBuffer, passData.ambientProbeBuffer);
// Output buffers
cmd.SetComputeTextureParam(passData.commonData.volumetricCloudsCS, passData.renderKernel, HDShaderIDs._CloudsLightingTextureRW, passData.intermediateLightingBuffer);
cmd.SetComputeTextureParam(passData.commonData.volumetricCloudsCS, passData.renderKernel, HDShaderIDs._CloudsDepthTextureRW, passData.intermediateDepthBuffer);
cmd.DispatchCompute(passData.commonData.volumetricCloudsCS, passData.renderKernel, traceTX, traceTY, 1);
CoreUtils.SetKeyword(cmd, "PHYSICALLY_BASED_SUN", false);
mpb.SetTexture(HDShaderIDs._VolumetricCloudsUpscaleTextureRW, passData.intermediateLightingBuffer);
CoreUtils.SetRenderTarget(cmd, passData.output, ClearFlag.None, miplevel: 2, cubemapFace: passData.cubemapFace);
CoreUtils.DrawFullScreen(cmd, passData.cloudCombinePass, mpb, 3);
}
void PrepareVolumetricCloudsSkyLowPassData(RenderGraph renderGraph, RenderGraphBuilder builder, HDCamera hdCamera, int width, int height, Matrix4x4[] pixelCoordToViewDir, CubemapFace cubemapFace, VolumetricClouds settings, VolumetricCloudsSkyLowPassData data)
{
// Compute the cloud model data
CloudModelData cloudModelData = GetCloudModelData(settings);
// Fill the common data
FillVolumetricCloudsCommonData(false, settings, TVolumetricCloudsCameraType.Sky, in cloudModelData, ref data.commonData);
// We need to make sure that the allocated size of the history buffers and the dispatch size are perfectly equal.
// The ideal approach would be to have a function for that returns the converted size from a viewport and texture size.
// but for now we do it like this.
// Final resolution at which the effect should be exported
data.finalWidth = width;
data.finalHeight = height;
// Intermediate resolution at which the effect is accumulated
data.intermediateWidth = Mathf.RoundToInt(0.5f * width);
data.intermediateHeight = Mathf.RoundToInt(0.5f * height);
// Resolution at which the effect is traced
data.traceWidth = Mathf.RoundToInt(0.25f * width);
data.traceHeight = Mathf.RoundToInt(0.25f * height);
// Sky
data.cubemapFace = cubemapFace;
data.cloudCombinePass = m_CloudCombinePass;
// Kernels
data.renderKernel = m_CloudRenderKernel;
data.preUpscaleKernel = m_PreUpscaleCloudsSkyKernel;
data.finalUpscaleKernel = m_UpscaleAndCombineCloudsSkyKernel;
data.pixelCoordToViewDir = pixelCoordToViewDir;
// Update the constant buffer
VolumetricCloudsCameraData cameraData;
cameraData.cameraType = data.commonData.cameraType;
cameraData.traceWidth = data.traceWidth;
cameraData.traceHeight = data.traceHeight;
cameraData.intermediateWidth = data.intermediateWidth;
cameraData.intermediateHeight = data.intermediateHeight;
cameraData.finalWidth = data.finalWidth;
cameraData.finalHeight = data.finalHeight;
cameraData.viewCount = 1;
cameraData.enableExposureControl = data.commonData.enableExposureControl;
cameraData.lowResolution = true;
cameraData.enableIntegration = false;
UpdateShaderVariableslClouds(ref data.commonData.cloudsCB, hdCamera, settings, cameraData, cloudModelData, false);
int skyResolution = (int)m_Asset.currentPlatformRenderPipelineSettings.lightLoopSettings.skyReflectionSize;
data.intermediateLightingBuffer = builder.CreateTransientTexture(GetVolumetricCloudsIntermediateLightingBufferDesc());
data.intermediateDepthBuffer = builder.CreateTransientTexture(GetVolumetricCloudsIntermediateDepthBufferDesc());
data.output = builder.WriteTexture(renderGraph.CreateTexture(GetVolumetricCloudsIntermediateCubeTextureDesc()));
data.maxZMask = builder.ReadTexture(renderGraph.defaultResources.blackTextureXR);
data.ambientProbeBuffer = builder.ReadComputeBuffer(renderGraph.ImportComputeBuffer(m_CloudsProbeBuffer));
}
