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341 lines
20 KiB
341 lines
20 KiB
using System;
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using UnityEngine.Experimental.Rendering;
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using UnityEngine.Rendering.RenderGraphModule;
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namespace UnityEngine.Rendering.HighDefinition
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{
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internal struct PunctualShadowProperties
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{
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public GPULightType lightType;
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public bool softShadow;
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public int lightIndex;
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public float lightRadius;
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public float lightConeAngle;
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public float lightSizeX;
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public float lightSizeY;
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public Vector3 lightPosition;
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public int kernelSize;
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public bool distanceBasedDenoiser;
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}
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public partial class HDRenderPipeline
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{
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static float EvaluateHistoryValidityPointShadow(HDCamera hdCamera, LightData lightData, HDAdditionalLightData additionalLightData)
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{
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// We need to set the history as invalid if the light has moved (rotated or translated),
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float historyValidity = 1.0f;
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if (hdCamera.shadowHistoryUsage[lightData.screenSpaceShadowIndex].transform != additionalLightData.transform.localToWorldMatrix
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|| !hdCamera.ValidShadowHistory(additionalLightData, lightData.screenSpaceShadowIndex, lightData.lightType))
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historyValidity = 0.0f;
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// We need to check if the camera implied an invalidation
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historyValidity *= EvaluateHistoryValidity(hdCamera);
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return historyValidity;
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}
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TextureHandle DenoisePunctualScreenSpaceShadow(RenderGraph renderGraph, HDCamera hdCamera,
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HDAdditionalLightData additionalLightData, in LightData lightData, PunctualShadowProperties properties,
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TextureHandle depthBuffer, TextureHandle normalBuffer, TextureHandle motionVetorsBuffer, TextureHandle historyValidityBuffer,
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TextureHandle noisyBuffer, TextureHandle velocityBuffer, TextureHandle distanceBufferI)
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{
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// Is the history still valid?
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float historyValidity = EvaluateHistoryValidityPointShadow(hdCamera, lightData, additionalLightData);
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// Evaluate the channel mask
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GetShadowChannelMask(lightData.screenSpaceShadowIndex, ScreenSpaceShadowType.GrayScale, ref m_ShadowChannelMask0);
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// Apply the temporal denoiser
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HDTemporalFilter temporalFilter = GetTemporalFilter();
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HDTemporalFilter.TemporalDenoiserArrayOutputData temporalFilterResult;
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// Only set the distance based denoising buffers if required.
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RTHandle shadowHistoryDistanceArray = null;
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TextureHandle distanceBuffer = new TextureHandle();
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if (additionalLightData.distanceBasedFiltering)
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{
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distanceBuffer = distanceBufferI;
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// Request the distance history buffer
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shadowHistoryDistanceArray = RequestShadowHistoryDistanceBuffer(hdCamera);
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}
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// Grab the history buffers for shadows
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RTHandle shadowHistoryArray = RequestShadowHistoryBuffer(hdCamera);
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RTHandle shadowHistoryValidityArray = RequestShadowHistoryValidityBuffer(hdCamera);
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// Temporal denoising
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temporalFilterResult = temporalFilter.DenoiseBuffer(renderGraph, hdCamera,
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depthBuffer, normalBuffer, motionVetorsBuffer, historyValidityBuffer,
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noisyBuffer, shadowHistoryArray,
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distanceBuffer, shadowHistoryDistanceArray,
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velocityBuffer,
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shadowHistoryValidityArray,
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lightData.screenSpaceShadowIndex / 4, m_ShadowChannelMask0, m_ShadowChannelMask0,
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additionalLightData.distanceBasedFiltering, true, historyValidity);
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// Spatial denoising
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HDDiffuseShadowDenoiser shadowDenoiser = GetDiffuseShadowDenoiser();
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TextureHandle denoisedBuffer = shadowDenoiser.DenoiseBufferSphere(renderGraph, hdCamera,
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depthBuffer, normalBuffer,
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temporalFilterResult.outputSignal, temporalFilterResult.outputSignalDistance,
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properties);
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// Now that we have overridden this history, mark is as used by this light
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hdCamera.PropagateShadowHistory(additionalLightData, lightData.screenSpaceShadowIndex, lightData.lightType);
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return denoisedBuffer;
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}
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class RTSPunctualTracePassData
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{
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// Camera parameters
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public int texWidth;
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public int texHeight;
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public int viewCount;
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// Evaluation parameters
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public bool distanceBasedFiltering;
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public int numShadowSamples;
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public bool semiTransparentShadow;
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public GPULightType lightType;
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public PunctualShadowProperties properties;
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// Kernels
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public int clearShadowKernel;
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public int shadowKernel;
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// Other parameters
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public RayTracingShader screenSpaceShadowRT;
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public ComputeShader screenSpaceShadowCS;
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public RayTracingAccelerationStructure accelerationStructure;
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public ShaderVariablesRaytracing shaderVariablesRayTracingCB;
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public BlueNoise.DitheredTextureSet ditheredTextureSet;
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// Input Buffers
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public TextureHandle depthStencilBuffer;
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public TextureHandle normalBuffer;
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// Intermediate buffers
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public TextureHandle directionBuffer;
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public TextureHandle rayLengthBuffer;
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// Debug textures
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public TextureHandle rayCountTexture;
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// Output buffers
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public TextureHandle velocityBuffer;
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public TextureHandle distanceBuffer;
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public TextureHandle outputShadowBuffer;
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}
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void RenderPunctualScreenSpaceShadow(RenderGraph renderGraph, HDCamera hdCamera
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, in LightData lightData, HDAdditionalLightData additionalLightData, int lightIndex,
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PrepassOutput prepassOutput, TextureHandle depthBuffer, TextureHandle normalBuffer, TextureHandle motionVectorsBuffer, TextureHandle historyValidityBuffer, TextureHandle rayCountTexture, TextureHandle screenSpaceShadowArray)
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{
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TextureHandle pointShadowBuffer;
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TextureHandle velocityBuffer;
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TextureHandle distanceBuffer;
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PunctualShadowProperties props = new PunctualShadowProperties();
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props.lightType = lightData.lightType;
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props.lightIndex = lightIndex;
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props.softShadow = additionalLightData.shapeRadius > 0.0 ? true : false;
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props.lightRadius = additionalLightData.shapeRadius;
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props.lightPosition = additionalLightData.transform.position;
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props.kernelSize = additionalLightData.filterSizeTraced;
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props.lightConeAngle = additionalLightData.legacyLight.spotAngle * (float)Math.PI / 180.0f;
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props.distanceBasedDenoiser = additionalLightData.distanceBasedFiltering;
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switch (lightData.lightType)
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{
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case (GPULightType.ProjectorPyramid):
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{
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float spotHalfAngleRadians = 0.5f * props.lightConeAngle;
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// Scale up one of the pyramind light angles based on aspect ratio
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// We reuse _RaytracingLightSizeX and _RaytracingLightSizeY for the pyramid angles here
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if (additionalLightData.aspectRatio < 1.0f)
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{
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float scaledLightAngle = 2.0f * Mathf.Atan(Mathf.Tan(spotHalfAngleRadians) / additionalLightData.aspectRatio);
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props.lightSizeX = props.lightConeAngle;
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props.lightSizeY = scaledLightAngle;
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}
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else
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{
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float scaledLightAngle = 2.0f * Mathf.Atan(Mathf.Tan(spotHalfAngleRadians) * additionalLightData.aspectRatio);
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props.lightSizeX = scaledLightAngle;
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props.lightSizeY = props.lightConeAngle;
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}
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}
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break;
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default:
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{
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props.lightSizeX = additionalLightData.shapeWidth;
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props.lightSizeY = additionalLightData.shapeHeight;
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}
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break;
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}
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using (var builder = renderGraph.AddRenderPass<RTSPunctualTracePassData>("Punctual RT Shadow", out var passData, ProfilingSampler.Get(HDProfileId.RaytracingLightShadow)))
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{
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// Set the camera parameters
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passData.texWidth = hdCamera.actualWidth;
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passData.texHeight = hdCamera.actualHeight;
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passData.viewCount = hdCamera.viewCount;
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// If the surface is infinitively small, we force it to one sample.
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passData.numShadowSamples = props.softShadow ? additionalLightData.numRayTracingSamples : 1;
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passData.distanceBasedFiltering = additionalLightData.distanceBasedFiltering;
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passData.semiTransparentShadow = additionalLightData.semiTransparentShadow;
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passData.lightType = lightData.lightType;
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passData.properties = props;
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// Kernels
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passData.clearShadowKernel = m_ClearShadowTexture;
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switch (lightData.lightType)
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{
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case GPULightType.Point:
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passData.shadowKernel = m_RaytracingPointShadowSample; break;
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case GPULightType.Spot: // Cone
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passData.shadowKernel = m_RaytracingSpotShadowSample; break;
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case GPULightType.ProjectorPyramid:
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passData.shadowKernel = m_RaytracingProjectorPyramidShadowSample; break;
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case GPULightType.ProjectorBox:
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passData.shadowKernel = m_RaytracingProjectorBoxShadowSample; break;
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default:
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passData.shadowKernel = m_RaytracingSpotShadowSample; break;
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}
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// Grab the acceleration structure for the target camera
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passData.accelerationStructure = RequestAccelerationStructure(hdCamera);
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passData.screenSpaceShadowCS = m_ScreenSpaceShadowsCS;
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passData.screenSpaceShadowRT = m_ScreenSpaceShadowsRT;
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passData.shaderVariablesRayTracingCB = m_ShaderVariablesRayTracingCB;
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passData.ditheredTextureSet = GetBlueNoiseManager().DitheredTextureSet8SPP();
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// Input Buffer
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passData.depthStencilBuffer = builder.UseDepthBuffer(depthBuffer, DepthAccess.Read);
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passData.normalBuffer = builder.ReadTexture(normalBuffer);
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passData.directionBuffer = builder.CreateTransientTexture(new TextureDesc(Vector2.one, true, true) { colorFormat = GraphicsFormat.R16G16B16A16_SFloat, enableRandomWrite = true, name = "Direction Buffer" });
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passData.rayLengthBuffer = builder.CreateTransientTexture(new TextureDesc(Vector2.one, true, true) { colorFormat = GraphicsFormat.R32_SFloat, enableRandomWrite = true, name = "Ray Length Buffer" });
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// Debug buffers
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passData.rayCountTexture = builder.ReadWriteTexture(rayCountTexture);
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// Output Buffers
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passData.velocityBuffer = builder.ReadWriteTexture(renderGraph.CreateTexture(new TextureDesc(Vector2.one, true, true)
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{ colorFormat = GraphicsFormat.R8_SNorm, enableRandomWrite = true, name = "Velocity Buffer" }));
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passData.distanceBuffer = builder.ReadWriteTexture(renderGraph.CreateTexture(new TextureDesc(Vector2.one, true, true)
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{ colorFormat = GraphicsFormat.R32_SFloat, enableRandomWrite = true, name = "Distance Buffer" }));
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passData.outputShadowBuffer = builder.ReadWriteTexture(renderGraph.CreateTexture(new TextureDesc(Vector2.one, true, true)
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{ colorFormat = GraphicsFormat.R16G16B16A16_SFloat, enableRandomWrite = true, name = "RT Sphere Shadow" }));
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builder.SetRenderFunc(
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(RTSPunctualTracePassData data, RenderGraphContext ctx) =>
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{
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// Inject the ray-tracing sampling data
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BlueNoise.BindDitheredTextureSet(ctx.cmd, data.ditheredTextureSet);
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// Evaluate the dispatch parameters
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int shadowTileSize = 8;
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int numTilesX = (data.texWidth + (shadowTileSize - 1)) / shadowTileSize;
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int numTilesY = (data.texHeight + (shadowTileSize - 1)) / shadowTileSize;
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// Clear the integration textures
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ctx.cmd.SetComputeTextureParam(data.screenSpaceShadowCS, data.clearShadowKernel, HDShaderIDs._RaytracedShadowIntegration, data.outputShadowBuffer);
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ctx.cmd.DispatchCompute(data.screenSpaceShadowCS, data.clearShadowKernel, numTilesX, numTilesY, data.viewCount);
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ctx.cmd.SetComputeTextureParam(data.screenSpaceShadowCS, data.clearShadowKernel, HDShaderIDs._RaytracedShadowIntegration, data.velocityBuffer);
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ctx.cmd.DispatchCompute(data.screenSpaceShadowCS, data.clearShadowKernel, numTilesX, numTilesY, data.viewCount);
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if (data.distanceBasedFiltering)
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{
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ctx.cmd.SetComputeTextureParam(data.screenSpaceShadowCS, data.clearShadowKernel, HDShaderIDs._RaytracedShadowIntegration, data.distanceBuffer);
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ctx.cmd.DispatchCompute(data.screenSpaceShadowCS, data.clearShadowKernel, numTilesX, numTilesY, data.viewCount);
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}
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// Set the acceleration structure for the pass
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ctx.cmd.SetRayTracingAccelerationStructure(data.screenSpaceShadowRT, HDShaderIDs._RaytracingAccelerationStructureName, data.accelerationStructure);
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// Define the shader pass to use for the reflection pass
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ctx.cmd.SetRayTracingShaderPass(data.screenSpaceShadowRT, "VisibilityDXR");
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if (data.lightType == GPULightType.ProjectorBox ||
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data.lightType == GPULightType.ProjectorPyramid)
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{
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ctx.cmd.SetComputeFloatParam(data.screenSpaceShadowCS, HDShaderIDs._RaytracingLightSizeX, data.properties.lightSizeX);
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ctx.cmd.SetComputeFloatParam(data.screenSpaceShadowCS, HDShaderIDs._RaytracingLightSizeY, data.properties.lightSizeY);
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}
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// Bind the light & sampling data
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ctx.cmd.SetComputeIntParam(data.screenSpaceShadowCS, HDShaderIDs._RaytracingTargetLight, data.properties.lightIndex);
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ctx.cmd.SetComputeFloatParam(data.screenSpaceShadowCS, HDShaderIDs._RaytracingLightRadius, data.properties.lightRadius);
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if (data.lightType == GPULightType.Spot)
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{
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ctx.cmd.SetComputeFloatParam(data.screenSpaceShadowCS, HDShaderIDs._RaytracingLightAngle, data.properties.lightConeAngle);
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}
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// Loop through the samples of this frame
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for (int sampleIdx = 0; sampleIdx < data.numShadowSamples; ++sampleIdx)
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{
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// Update global constant buffer
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data.shaderVariablesRayTracingCB._RaytracingSampleIndex = sampleIdx;
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data.shaderVariablesRayTracingCB._RaytracingNumSamples = data.numShadowSamples;
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ConstantBuffer.PushGlobal(ctx.cmd, data.shaderVariablesRayTracingCB, HDShaderIDs._ShaderVariablesRaytracing);
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// Input Buffer
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ctx.cmd.SetComputeTextureParam(data.screenSpaceShadowCS, data.shadowKernel, HDShaderIDs._DepthTexture, data.depthStencilBuffer);
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ctx.cmd.SetComputeTextureParam(data.screenSpaceShadowCS, data.shadowKernel, HDShaderIDs._StencilTexture, data.depthStencilBuffer, 0, RenderTextureSubElement.Stencil);
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ctx.cmd.SetComputeTextureParam(data.screenSpaceShadowCS, data.shadowKernel, HDShaderIDs._NormalBufferTexture, data.normalBuffer);
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// Output buffers
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ctx.cmd.SetComputeTextureParam(data.screenSpaceShadowCS, data.shadowKernel, HDShaderIDs._RaytracingDirectionBuffer, data.directionBuffer);
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ctx.cmd.SetComputeTextureParam(data.screenSpaceShadowCS, data.shadowKernel, HDShaderIDs._RayTracingLengthBuffer, data.rayLengthBuffer);
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// Generate a new direction
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ctx.cmd.DispatchCompute(data.screenSpaceShadowCS, data.shadowKernel, numTilesX, numTilesY, data.viewCount);
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// Define the shader pass to use for the shadow pass
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ctx.cmd.SetRayTracingShaderPass(data.screenSpaceShadowRT, "VisibilityDXR");
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// Set ray count texture
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ctx.cmd.SetRayTracingTextureParam(data.screenSpaceShadowRT, HDShaderIDs._RayCountTexture, data.rayCountTexture);
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// Input buffers
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ctx.cmd.SetRayTracingTextureParam(data.screenSpaceShadowRT, HDShaderIDs._DepthTexture, data.depthStencilBuffer);
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ctx.cmd.SetRayTracingTextureParam(data.screenSpaceShadowRT, HDShaderIDs._NormalBufferTexture, data.normalBuffer);
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ctx.cmd.SetRayTracingTextureParam(data.screenSpaceShadowRT, HDShaderIDs._RaytracingDirectionBuffer, data.directionBuffer);
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ctx.cmd.SetRayTracingTextureParam(data.screenSpaceShadowRT, HDShaderIDs._RayTracingLengthBuffer, data.rayLengthBuffer);
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// Output buffer
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ctx.cmd.SetRayTracingTextureParam(data.screenSpaceShadowRT, HDShaderIDs._RaytracedShadowIntegration, data.outputShadowBuffer);
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ctx.cmd.SetRayTracingTextureParam(data.screenSpaceShadowRT, HDShaderIDs._VelocityBuffer, data.velocityBuffer);
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ctx.cmd.SetRayTracingTextureParam(data.screenSpaceShadowRT, HDShaderIDs._RaytracingDistanceBufferRW, data.distanceBuffer);
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CoreUtils.SetKeyword(ctx.cmd, "TRANSPARENT_COLOR_SHADOW", data.semiTransparentShadow);
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ctx.cmd.DispatchRays(data.screenSpaceShadowRT, data.semiTransparentShadow ? m_RayGenSemiTransparentShadowSegmentSingleName : m_RayGenShadowSegmentSingleName, (uint)data.texWidth, (uint)data.texHeight, (uint)data.viewCount);
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CoreUtils.SetKeyword(ctx.cmd, "TRANSPARENT_COLOR_SHADOW", false);
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}
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});
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pointShadowBuffer = passData.outputShadowBuffer;
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velocityBuffer = passData.velocityBuffer;
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distanceBuffer = passData.distanceBuffer;
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}
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// If required, denoise the shadow
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if (additionalLightData.filterTracedShadow && props.softShadow)
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{
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pointShadowBuffer = DenoisePunctualScreenSpaceShadow(renderGraph, hdCamera,
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additionalLightData, lightData, props,
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depthBuffer, normalBuffer, motionVectorsBuffer, historyValidityBuffer,
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pointShadowBuffer, velocityBuffer, distanceBuffer);
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}
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// Write the result texture to the screen space shadow buffer
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WriteScreenSpaceShadow(renderGraph, hdCamera, pointShadowBuffer, screenSpaceShadowArray, lightData.screenSpaceShadowIndex, ScreenSpaceShadowType.GrayScale);
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}
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}
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}
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