using UnityEngine.Rendering;
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namespace UnityEngine.PostProcessing
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{
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using SSRResolution = ScreenSpaceReflectionModel.SSRResolution;
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using SSRReflectionBlendType = ScreenSpaceReflectionModel.SSRReflectionBlendType;
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public sealed class ScreenSpaceReflectionComponent : PostProcessingComponentCommandBuffer<ScreenSpaceReflectionModel>
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{
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static class Uniforms
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{
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internal static readonly int _RayStepSize = Shader.PropertyToID("_RayStepSize");
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internal static readonly int _AdditiveReflection = Shader.PropertyToID("_AdditiveReflection");
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internal static readonly int _BilateralUpsampling = Shader.PropertyToID("_BilateralUpsampling");
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internal static readonly int _TreatBackfaceHitAsMiss = Shader.PropertyToID("_TreatBackfaceHitAsMiss");
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internal static readonly int _AllowBackwardsRays = Shader.PropertyToID("_AllowBackwardsRays");
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internal static readonly int _TraceBehindObjects = Shader.PropertyToID("_TraceBehindObjects");
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internal static readonly int _MaxSteps = Shader.PropertyToID("_MaxSteps");
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internal static readonly int _FullResolutionFiltering = Shader.PropertyToID("_FullResolutionFiltering");
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internal static readonly int _HalfResolution = Shader.PropertyToID("_HalfResolution");
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internal static readonly int _HighlightSuppression = Shader.PropertyToID("_HighlightSuppression");
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internal static readonly int _PixelsPerMeterAtOneMeter = Shader.PropertyToID("_PixelsPerMeterAtOneMeter");
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internal static readonly int _ScreenEdgeFading = Shader.PropertyToID("_ScreenEdgeFading");
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internal static readonly int _ReflectionBlur = Shader.PropertyToID("_ReflectionBlur");
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internal static readonly int _MaxRayTraceDistance = Shader.PropertyToID("_MaxRayTraceDistance");
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internal static readonly int _FadeDistance = Shader.PropertyToID("_FadeDistance");
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internal static readonly int _LayerThickness = Shader.PropertyToID("_LayerThickness");
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internal static readonly int _SSRMultiplier = Shader.PropertyToID("_SSRMultiplier");
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internal static readonly int _FresnelFade = Shader.PropertyToID("_FresnelFade");
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internal static readonly int _FresnelFadePower = Shader.PropertyToID("_FresnelFadePower");
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internal static readonly int _ReflectionBufferSize = Shader.PropertyToID("_ReflectionBufferSize");
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internal static readonly int _ScreenSize = Shader.PropertyToID("_ScreenSize");
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internal static readonly int _InvScreenSize = Shader.PropertyToID("_InvScreenSize");
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internal static readonly int _ProjInfo = Shader.PropertyToID("_ProjInfo");
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internal static readonly int _CameraClipInfo = Shader.PropertyToID("_CameraClipInfo");
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internal static readonly int _ProjectToPixelMatrix = Shader.PropertyToID("_ProjectToPixelMatrix");
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internal static readonly int _WorldToCameraMatrix = Shader.PropertyToID("_WorldToCameraMatrix");
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internal static readonly int _CameraToWorldMatrix = Shader.PropertyToID("_CameraToWorldMatrix");
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internal static readonly int _Axis = Shader.PropertyToID("_Axis");
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internal static readonly int _CurrentMipLevel = Shader.PropertyToID("_CurrentMipLevel");
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internal static readonly int _NormalAndRoughnessTexture = Shader.PropertyToID("_NormalAndRoughnessTexture");
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internal static readonly int _HitPointTexture = Shader.PropertyToID("_HitPointTexture");
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internal static readonly int _BlurTexture = Shader.PropertyToID("_BlurTexture");
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internal static readonly int _FilteredReflections = Shader.PropertyToID("_FilteredReflections");
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internal static readonly int _FinalReflectionTexture = Shader.PropertyToID("_FinalReflectionTexture");
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internal static readonly int _TempTexture = Shader.PropertyToID("_TempTexture");
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}
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// Unexposed variables
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bool k_HighlightSuppression = false;
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bool k_TraceBehindObjects = true;
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bool k_TreatBackfaceHitAsMiss = false;
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bool k_BilateralUpsample = true;
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enum PassIndex
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{
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RayTraceStep = 0,
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CompositeFinal = 1,
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Blur = 2,
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CompositeSSR = 3,
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MinMipGeneration = 4,
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HitPointToReflections = 5,
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BilateralKeyPack = 6,
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BlitDepthAsCSZ = 7,
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PoissonBlur = 8,
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}
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readonly int[] m_ReflectionTextures = new int[5];
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// Not really needed as SSR only works in deferred right now
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public override DepthTextureMode GetCameraFlags()
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{
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return DepthTextureMode.Depth;
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}
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public override bool active
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{
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get
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{
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return model.enabled
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&& context.isGBufferAvailable
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&& !context.interrupted;
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}
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}
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public override void OnEnable()
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{
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m_ReflectionTextures[0] = Shader.PropertyToID("_ReflectionTexture0");
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m_ReflectionTextures[1] = Shader.PropertyToID("_ReflectionTexture1");
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m_ReflectionTextures[2] = Shader.PropertyToID("_ReflectionTexture2");
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m_ReflectionTextures[3] = Shader.PropertyToID("_ReflectionTexture3");
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m_ReflectionTextures[4] = Shader.PropertyToID("_ReflectionTexture4");
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}
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public override string GetName()
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{
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return "Screen Space Reflection";
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}
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public override CameraEvent GetCameraEvent()
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{
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return CameraEvent.AfterFinalPass;
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}
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public override void PopulateCommandBuffer(CommandBuffer cb)
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{
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var settings = model.settings;
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var camera = context.camera;
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// Material setup
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int downsampleAmount = (settings.reflection.reflectionQuality == SSRResolution.High) ? 1 : 2;
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var rtW = context.width / downsampleAmount;
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var rtH = context.height / downsampleAmount;
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float sWidth = context.width;
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float sHeight = context.height;
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float sx = sWidth / 2f;
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float sy = sHeight / 2f;
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var material = context.materialFactory.Get("Hidden/Post FX/Screen Space Reflection");
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material.SetInt(Uniforms._RayStepSize, settings.reflection.stepSize);
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material.SetInt(Uniforms._AdditiveReflection, settings.reflection.blendType == SSRReflectionBlendType.Additive ? 1 : 0);
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material.SetInt(Uniforms._BilateralUpsampling, k_BilateralUpsample ? 1 : 0);
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material.SetInt(Uniforms._TreatBackfaceHitAsMiss, k_TreatBackfaceHitAsMiss ? 1 : 0);
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material.SetInt(Uniforms._AllowBackwardsRays, settings.reflection.reflectBackfaces ? 1 : 0);
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material.SetInt(Uniforms._TraceBehindObjects, k_TraceBehindObjects ? 1 : 0);
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material.SetInt(Uniforms._MaxSteps, settings.reflection.iterationCount);
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material.SetInt(Uniforms._FullResolutionFiltering, 0);
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material.SetInt(Uniforms._HalfResolution, (settings.reflection.reflectionQuality != SSRResolution.High) ? 1 : 0);
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material.SetInt(Uniforms._HighlightSuppression, k_HighlightSuppression ? 1 : 0);
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// The height in pixels of a 1m object if viewed from 1m away.
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float pixelsPerMeterAtOneMeter = sWidth / (-2f * Mathf.Tan(camera.fieldOfView / 180f * Mathf.PI * 0.5f));
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material.SetFloat(Uniforms._PixelsPerMeterAtOneMeter, pixelsPerMeterAtOneMeter);
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material.SetFloat(Uniforms._ScreenEdgeFading, settings.screenEdgeMask.intensity);
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material.SetFloat(Uniforms._ReflectionBlur, settings.reflection.reflectionBlur);
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material.SetFloat(Uniforms._MaxRayTraceDistance, settings.reflection.maxDistance);
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material.SetFloat(Uniforms._FadeDistance, settings.intensity.fadeDistance);
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material.SetFloat(Uniforms._LayerThickness, settings.reflection.widthModifier);
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material.SetFloat(Uniforms._SSRMultiplier, settings.intensity.reflectionMultiplier);
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material.SetFloat(Uniforms._FresnelFade, settings.intensity.fresnelFade);
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material.SetFloat(Uniforms._FresnelFadePower, settings.intensity.fresnelFadePower);
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var P = camera.projectionMatrix;
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var projInfo = new Vector4(
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-2f / (sWidth * P[0]),
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-2f / (sHeight * P[5]),
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(1f - P[2]) / P[0],
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(1f + P[6]) / P[5]
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);
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var cameraClipInfo = float.IsPositiveInfinity(camera.farClipPlane) ?
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new Vector3(camera.nearClipPlane, -1f, 1f) :
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new Vector3(camera.nearClipPlane * camera.farClipPlane, camera.nearClipPlane - camera.farClipPlane, camera.farClipPlane);
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material.SetVector(Uniforms._ReflectionBufferSize, new Vector2(rtW, rtH));
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material.SetVector(Uniforms._ScreenSize, new Vector2(sWidth, sHeight));
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material.SetVector(Uniforms._InvScreenSize, new Vector2(1f / sWidth, 1f / sHeight));
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material.SetVector(Uniforms._ProjInfo, projInfo); // used for unprojection
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material.SetVector(Uniforms._CameraClipInfo, cameraClipInfo);
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var warpToScreenSpaceMatrix = new Matrix4x4();
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warpToScreenSpaceMatrix.SetRow(0, new Vector4(sx, 0f, 0f, sx));
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warpToScreenSpaceMatrix.SetRow(1, new Vector4(0f, sy, 0f, sy));
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warpToScreenSpaceMatrix.SetRow(2, new Vector4(0f, 0f, 1f, 0f));
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warpToScreenSpaceMatrix.SetRow(3, new Vector4(0f, 0f, 0f, 1f));
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var projectToPixelMatrix = warpToScreenSpaceMatrix * P;
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material.SetMatrix(Uniforms._ProjectToPixelMatrix, projectToPixelMatrix);
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material.SetMatrix(Uniforms._WorldToCameraMatrix, camera.worldToCameraMatrix);
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material.SetMatrix(Uniforms._CameraToWorldMatrix, camera.worldToCameraMatrix.inverse);
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// Command buffer setup
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var intermediateFormat = context.isHdr ? RenderTextureFormat.ARGBHalf : RenderTextureFormat.ARGB32;
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const int maxMip = 5;
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var kNormalAndRoughnessTexture = Uniforms._NormalAndRoughnessTexture;
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var kHitPointTexture = Uniforms._HitPointTexture;
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var kBlurTexture = Uniforms._BlurTexture;
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var kFilteredReflections = Uniforms._FilteredReflections;
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var kFinalReflectionTexture = Uniforms._FinalReflectionTexture;
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var kTempTexture = Uniforms._TempTexture;
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// RGB: Normals, A: Roughness.
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// Has the nice benefit of allowing us to control the filtering mode as well.
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cb.GetTemporaryRT(kNormalAndRoughnessTexture, -1, -1, 0, FilterMode.Point, RenderTextureFormat.ARGB32, RenderTextureReadWrite.Linear);
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cb.GetTemporaryRT(kHitPointTexture, rtW, rtH, 0, FilterMode.Bilinear, RenderTextureFormat.ARGBHalf, RenderTextureReadWrite.Linear);
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for (int i = 0; i < maxMip; ++i)
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{
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// We explicitly interpolate during bilateral upsampling.
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cb.GetTemporaryRT(m_ReflectionTextures[i], rtW >> i, rtH >> i, 0, FilterMode.Bilinear, intermediateFormat);
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}
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cb.GetTemporaryRT(kFilteredReflections, rtW, rtH, 0, k_BilateralUpsample ? FilterMode.Point : FilterMode.Bilinear, intermediateFormat);
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cb.GetTemporaryRT(kFinalReflectionTexture, rtW, rtH, 0, FilterMode.Point, intermediateFormat);
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cb.Blit(BuiltinRenderTextureType.CameraTarget, kNormalAndRoughnessTexture, material, (int)PassIndex.BilateralKeyPack);
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cb.Blit(BuiltinRenderTextureType.CameraTarget, kHitPointTexture, material, (int)PassIndex.RayTraceStep);
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cb.Blit(BuiltinRenderTextureType.CameraTarget, kFilteredReflections, material, (int)PassIndex.HitPointToReflections);
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cb.Blit(kFilteredReflections, m_ReflectionTextures[0], material, (int)PassIndex.PoissonBlur);
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for (int i = 1; i < maxMip; ++i)
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{
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int inputTex = m_ReflectionTextures[i - 1];
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int lowMip = i;
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cb.GetTemporaryRT(kBlurTexture, rtW >> lowMip, rtH >> lowMip, 0, FilterMode.Bilinear, intermediateFormat);
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cb.SetGlobalVector(Uniforms._Axis, new Vector4(1.0f, 0.0f, 0.0f, 0.0f));
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cb.SetGlobalFloat(Uniforms._CurrentMipLevel, i - 1.0f);
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cb.Blit(inputTex, kBlurTexture, material, (int)PassIndex.Blur);
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cb.SetGlobalVector(Uniforms._Axis, new Vector4(0.0f, 1.0f, 0.0f, 0.0f));
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inputTex = m_ReflectionTextures[i];
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cb.Blit(kBlurTexture, inputTex, material, (int)PassIndex.Blur);
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cb.ReleaseTemporaryRT(kBlurTexture);
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}
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cb.Blit(m_ReflectionTextures[0], kFinalReflectionTexture, material, (int)PassIndex.CompositeSSR);
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cb.GetTemporaryRT(kTempTexture, camera.pixelWidth, camera.pixelHeight, 0, FilterMode.Bilinear, intermediateFormat);
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cb.Blit(BuiltinRenderTextureType.CameraTarget, kTempTexture, material, (int)PassIndex.CompositeFinal);
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cb.Blit(kTempTexture, BuiltinRenderTextureType.CameraTarget);
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cb.ReleaseTemporaryRT(kTempTexture);
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}
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}
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}
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