vault backup: 2024-06-20 19:05:41
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@ -1,3 +1,7 @@
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# TODO
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- [ ] [[#BasePass]]
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- [ ] [[#DeferredShadingCommon.ush]]
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# Common
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## Common.ush
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添加结构体，主要用在材质的CustomNode里。
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@ -29,18 +33,377 @@ struct FToonShadingPerMaterialCustomData
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static FToonShadingPerMaterialCustomData ToonShadingPerMaterialCustomData;
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```
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## DeferredShadingCommon.ush
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# BasePass
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BasePassPixelShader.usf
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# Lighting
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## ShadingModels
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### ShadingCommon.ush
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1. 添加ShadingModelID宏：
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- SHADINGMODELID_TOON_BASE 13
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-
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**添加ShadingModelID宏**：
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- SHADINGMODELID_TOON_BASE 13
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- SHADINGMODELID_TOON_PBR 14
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- SHADINGMODELID_TOON_SKIN 15
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- SHADINGMODELID_NUM 16
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判断是否是IsToonShadingModel:
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```c++
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bool IsToonShadingModel(uint ShadingModel)
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{
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uint4 ToonShadingModels = uint4(SHADINGMODELID_TOON_BASE, SHADINGMODELID_TOON_PBR, SHADINGMODELID_TOON_SKIN, 0xFF);
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return any(ShadingModel.xxxx == ToonShadingModels);
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}
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```
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## DeferredLightingCommon.ush
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修改了AccumulateDynamicLighting()的逻辑。
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```c++
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FLightAccumulator AccumulateDynamicLighting(
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float3 TranslatedWorldPosition, half3 CameraVector, FGBufferData GBuffer, half AmbientOcclusion, uint ShadingModelID,
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FDeferredLightData LightData, half4 LightAttenuation, float Dither, uint2 SVPos,
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inout float SurfaceShadow)
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{
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FLightAccumulator LightAccumulator = (FLightAccumulator)0;
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half3 V = -CameraVector;
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half3 N = GBuffer.WorldNormal;
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BRANCH if( GBuffer.ShadingModelID == SHADINGMODELID_CLEAR_COAT && CLEAR_COAT_BOTTOM_NORMAL)
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{
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const float2 oct1 = ((float2(GBuffer.CustomData.a, GBuffer.CustomData.z) * 4) - (512.0/255.0)) + UnitVectorToOctahedron(GBuffer.WorldNormal);
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N = OctahedronToUnitVector(oct1);
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}
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float3 L = LightData.Direction; // Already normalized
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float3 ToLight = L;
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float3 MaskedLightColor = LightData.Color;
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float LightMask = 1;
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if (LightData.bRadialLight)
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{
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LightMask = GetLocalLightAttenuation( TranslatedWorldPosition, LightData, ToLight, L );
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MaskedLightColor *= LightMask;
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}
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LightAccumulator.EstimatedCost += 0.3f; // running the PixelShader at all has a cost
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BRANCH
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if( LightMask > 0 )
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{
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FShadowTerms Shadow;
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Shadow.SurfaceShadow = AmbientOcclusion;
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Shadow.TransmissionShadow = 1;
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Shadow.TransmissionThickness = 1;
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Shadow.HairTransmittance.OpaqueVisibility = 1;
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const float ContactShadowOpacity = GBuffer.CustomData.a;
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GetShadowTerms(GBuffer.Depth, GBuffer.PrecomputedShadowFactors, GBuffer.ShadingModelID, ContactShadowOpacity,
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LightData, TranslatedWorldPosition, L, LightAttenuation, Dither, Shadow);
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SurfaceShadow = Shadow.SurfaceShadow;
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LightAccumulator.EstimatedCost += 0.3f; // add the cost of getting the shadow terms
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#if SHADING_PATH_MOBILE
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const bool bNeedsSeparateSubsurfaceLightAccumulation = UseSubsurfaceProfile(GBuffer.ShadingModelID);
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FDirectLighting Lighting = (FDirectLighting)0;
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half NoL = max(0, dot(GBuffer.WorldNormal, L));
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#if TRANSLUCENCY_NON_DIRECTIONAL
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NoL = 1.0f;
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#endif
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Lighting = EvaluateBxDF(GBuffer, N, V, L, NoL, Shadow);
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Lighting.Specular *= LightData.SpecularScale;
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LightAccumulator_AddSplit( LightAccumulator, Lighting.Diffuse, Lighting.Specular, Lighting.Diffuse, MaskedLightColor * Shadow.SurfaceShadow, bNeedsSeparateSubsurfaceLightAccumulation );
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LightAccumulator_AddSplit( LightAccumulator, Lighting.Transmission, 0.0f, Lighting.Transmission, MaskedLightColor * Shadow.TransmissionShadow, bNeedsSeparateSubsurfaceLightAccumulation );
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#else // SHADING_PATH_MOBILE
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//修改了这里
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bool UseToonShadow = IsToonShadingModel(GBuffer.ShadingModelID);
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BRANCH
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if( Shadow.SurfaceShadow + Shadow.TransmissionShadow > 0 || UseToonShadow)//修改结束
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{
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const bool bNeedsSeparateSubsurfaceLightAccumulation = UseSubsurfaceProfile(GBuffer.ShadingModelID);
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//修改了这里
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BRANCH
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if(UseToonShadow)
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{
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float NoL = dot(N, L);
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float ToonNoL = min(NoL, GBuffer.ToonForceShadow);
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//合并SurfaceShadow以及Transmision Shadow
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Shadow.SurfaceShadow = min(Shadow.SurfaceShadow, Shadow.TransmissionShadow);
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//根据ToonShadowSmoothness、ToonShadowLocation、NoL计算阴影亮度，最后计算主阴影颜色。
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float RangeHalf = GBuffer.ToonShadowSmoothness * 0.5;
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float RangeMin = max(0.0, GBuffer.ToonShadowLocation - RangeHalf);
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float RangeMax = min(1.0, GBuffer.ToonShadowLocation + RangeHalf);
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float ShadowIntensity = Shadow.SurfaceShadow * smoothstep(RangeMin, RangeMax, ToonNoL);
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GBuffer.ToonCalcShadowColor = lerp(GBuffer.ToonShadowColor * LightData.SpecularScale, (1.0).xxx, ShadowIntensity);
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//计算次级阴影颜色，并最终合成。
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RangeHalf = GBuffer.ToonSecondaryShadowSmoothness * 0.5;
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RangeMin = max(0.0, GBuffer.ToonSecondaryShadowLocation - RangeHalf);
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RangeMax = min(1.0, GBuffer.ToonSecondaryShadowLocation + RangeHalf);
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ShadowIntensity = Shadow.SurfaceShadow * smoothstep(RangeMin, RangeMax, ToonNoL);
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GBuffer.ToonCalcShadowColor = lerp(GBuffer.ToonSecondaryShadowColor * LightData.SpecularScale, GBuffer.ToonCalcShadowColor, ShadowIntensity);
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}
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//修改结束
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#if NON_DIRECTIONAL_DIRECT_LIGHTING
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float Lighting;
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if( LightData.bRectLight )
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{
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FRect Rect = GetRect( ToLight, LightData );
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Lighting = IntegrateLight( Rect );
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}
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else
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{
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FCapsuleLight Capsule = GetCapsule( ToLight, LightData );
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Lighting = IntegrateLight( Capsule, LightData.bInverseSquared );
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}
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float3 LightingDiffuse = Diffuse_Lambert( GBuffer.DiffuseColor ) * Lighting;
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LightAccumulator_AddSplit(LightAccumulator, LightingDiffuse, 0.0f, 0, MaskedLightColor * Shadow.SurfaceShadow, bNeedsSeparateSubsurfaceLightAccumulation);
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#else
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FDirectLighting Lighting;
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if (LightData.bRectLight)
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{
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FRect Rect = GetRect( ToLight, LightData );
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const FRectTexture SourceTexture = ConvertToRectTexture(LightData);
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#if REFERENCE_QUALITY
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Lighting = IntegrateBxDF( GBuffer, N, V, Rect, Shadow, SourceTexture, SVPos );
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#else
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Lighting = IntegrateBxDF( GBuffer, N, V, Rect, Shadow, SourceTexture);
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#endif
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}
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else
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{
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FCapsuleLight Capsule = GetCapsule( ToLight, LightData );
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#if REFERENCE_QUALITY
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Lighting = IntegrateBxDF( GBuffer, N, V, Capsule, Shadow, SVPos );
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#else
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Lighting = IntegrateBxDF( GBuffer, N, V, Capsule, Shadow, LightData.bInverseSquared );
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#endif
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}
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//修改了这里
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float SurfaceShadow = UseToonShadow ? 1.0 : Shadow.SurfaceShadow;
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float TransmissionShadow = UseToonShadow ? 1.0 : Shadow.TransmissionShadow;
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Lighting.Specular *= UseToonShadow ? GBuffer.ToonSpecularColor : LightData.SpecularScale;
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LightAccumulator_AddSplit( LightAccumulator, Lighting.Diffuse, Lighting.Specular, Lighting.Diffuse, MaskedLightColor * SurfaceShadow, bNeedsSeparateSubsurfaceLightAccumulation );
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LightAccumulator_AddSplit( LightAccumulator, Lighting.Transmission, 0.0f, Lighting.Transmission, MaskedLightColor * TransmissionShadow, bNeedsSeparateSubsurfaceLightAccumulation );
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//修改结束
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LightAccumulator.EstimatedCost += 0.4f; // add the cost of the lighting computations (should sum up to 1 form one light)
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#endif
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}
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#endif // SHADING_PATH_MOBILE
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}
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return LightAccumulator;
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}
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```
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## ShadingModels.ush
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```c++
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float3 ToonSpecular(float ToonSpecularLocation, float ToonSpecularSmoothness, float3 ToonSpecularColor, float NoL)
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{
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float ToonSpecularRangeHalf = ToonSpecularSmoothness * 0.5;
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float ToonSpecularRangeMin = ToonSpecularLocation - ToonSpecularRangeHalf;
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float ToonSpecularRangeMax = ToonSpecularLocation + ToonSpecularRangeHalf;
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return smoothstep(ToonSpecularRangeMin, ToonSpecularRangeMax, NoL) * ToonSpecularColor;
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}
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```
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创建了ToonCustomBxDF（**SHADINGMODELID_TOON_BASE**）与ToonLitBxDF（**SHADINGMODELID_TOON_PBR**、**SHADINGMODELID_TOON_SKIN**）2个ShadingModel函数。
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### ToonCustomBxDF的修改
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Diffuse里面乘以之前在DeferredShadingCommon.ush中计算好的ShadowColor（已经计算了NoL）
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`Lighting.Diffuse *= AreaLight.FalloffColor * (Falloff * NoL);`
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=>
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`Lighting.Diffuse *= AreaLight.FalloffColor * Falloff * GBuffer.ToonCalcShadowColor;`
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Speuclar直接归零，具体是在BasePass阶段进行计算了。
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`Lighting.Specular = 0；`
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### ToonLitBxDF的修改
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Diffuse里面乘以之前在DeferredShadingCommon.ush中计算好的ShadowColor（已经计算了NoL）
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`Lighting.Diffuse *= AreaLight.FalloffColor * (Falloff * NoL);`
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=>
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`Lighting.Diffuse *= AreaLight.FalloffColor * Falloff * GBuffer.ToonCalcShadowColor;`
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Speuclar最后乘以了**Shadow.SurfaceShadow**
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`Lighting.Specular *= Shadow.SurfaceShadow;`
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```c++
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FDirectLighting ToonLitBxDF( FGBufferData GBuffer, half3 N, half3 V, half3 L, float Falloff, half NoL, FAreaLight AreaLight, FShadowTerms Shadow )
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{
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BxDFContext Context;
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FDirectLighting Lighting;
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#if SUPPORTS_ANISOTROPIC_MATERIALS
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bool bHasAnisotropy = HasAnisotropy(GBuffer.SelectiveOutputMask);
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#else
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bool bHasAnisotropy = false;
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#endif
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float NoV, VoH, NoH;
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BRANCH
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if (bHasAnisotropy)
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{
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half3 X = GBuffer.WorldTangent;
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half3 Y = normalize(cross(N, X));
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Init(Context, N, X, Y, V, L);
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NoV = Context.NoV;
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VoH = Context.VoH;
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NoH = Context.NoH;
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}
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else
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{
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#if SHADING_PATH_MOBILE
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InitMobile(Context, N, V, L, NoL);
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#else
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Init(Context, N, V, L);
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#endif
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NoV = Context.NoV;
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VoH = Context.VoH;
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NoH = Context.NoH;
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SphereMaxNoH(Context, AreaLight.SphereSinAlpha, true);
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}
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Context.NoV = saturate(abs( Context.NoV ) + 1e-5);
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#if MATERIAL_ROUGHDIFFUSE
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// Chan diffuse model with roughness == specular roughness. This is not necessarily a good modelisation of reality because when the mean free path is super small, the diffuse can in fact looks rougher. But this is a start.
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// Also we cannot use the morphed context maximising NoH as this is causing visual artefact when interpolating rough/smooth diffuse response.
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Lighting.Diffuse = Diffuse_Chan(GBuffer.DiffuseColor, Pow4(GBuffer.Roughness), NoV, NoL, VoH, NoH, GetAreaLightDiffuseMicroReflWeight(AreaLight));
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#else
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Lighting.Diffuse = Diffuse_Lambert(GBuffer.DiffuseColor);
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#endif
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// Toon Diffuse
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Lighting.Diffuse *= AreaLight.FalloffColor * Falloff * GBuffer.ToonCalcShadowColor;
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BRANCH
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if (bHasAnisotropy)
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{
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//Lighting.Specular = GBuffer.WorldTangent * .5f + .5f;
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Lighting.Specular = AreaLight.FalloffColor * (Falloff * NoL) * SpecularGGX(GBuffer.Roughness, GBuffer.Anisotropy, GBuffer.SpecularColor, Context, NoL, AreaLight);
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}
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else
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{
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if( IsRectLight(AreaLight) )
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{
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Lighting.Specular = RectGGXApproxLTC(GBuffer.Roughness, GBuffer.SpecularColor, N, V, AreaLight.Rect, AreaLight.Texture);
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}
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else
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{
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// Toon specular
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Lighting.Specular = AreaLight.FalloffColor * (Falloff * NoL) * SpecularGGX(GBuffer.Roughness, GBuffer.SpecularColor, Context, NoL, AreaLight);
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}
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}
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Lighting.Specular *= Shadow.SurfaceShadow;
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FBxDFEnergyTerms EnergyTerms = ComputeGGXSpecEnergyTerms(GBuffer.Roughness, Context.NoV, GBuffer.SpecularColor);
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// Add energy presevation (i.e. attenuation of the specular layer onto the diffuse component
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Lighting.Diffuse *= ComputeEnergyPreservation(EnergyTerms);
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// Add specular microfacet multiple scattering term (energy-conservation)
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Lighting.Specular *= ComputeEnergyConservation(EnergyTerms);
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Lighting.Transmission = 0;
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return Lighting;
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}
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FDirectLighting ToonCustomBxDF( FGBufferData GBuffer, half3 N, half3 V, half3 L, float Falloff, half NoL, FAreaLight AreaLight, FShadowTerms Shadow )
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{
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BxDFContext Context;
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FDirectLighting Lighting;
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float NoV, VoH, NoH;
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#if SHADING_PATH_MOBILE
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InitMobile(Context, N, V, L, NoL);
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#else
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Init(Context, N, V, L);
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#endif
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NoV = Context.NoV;
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VoH = Context.VoH;
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NoH = Context.NoH;
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SphereMaxNoH(Context, AreaLight.SphereSinAlpha, true);
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Context.NoV = saturate(abs( Context.NoV ) + 1e-5);
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#if MATERIAL_ROUGHDIFFUSE
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// Chan diffuse model with roughness == specular roughness. This is not necessarily a good modelisation of reality because when the mean free path is super small, the diffuse can in fact looks rougher. But this is a start.
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// Also we cannot use the morphed context maximising NoH as this is causing visual artefact when interpolating rough/smooth diffuse response.
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Lighting.Diffuse = Diffuse_Chan(GBuffer.DiffuseColor, Pow4(GBuffer.Roughness), NoV, NoL, VoH, NoH, GetAreaLightDiffuseMicroReflWeight(AreaLight));
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#else
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Lighting.Diffuse = Diffuse_Lambert(GBuffer.DiffuseColor);
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#endif
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// Toon Diffuse
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Lighting.Diffuse *= AreaLight.FalloffColor * Falloff * GBuffer.ToonCalcShadowColor;
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// Toon specular
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// Lighting.Specular = AreaLight.FalloffColor * (Falloff * NoL) * ToonSpecular(GBuffer.ToonSpecularLocation, GBuffer.ToonSpecularSmoothness, GBuffer.ToonSpecularColor, NoL);
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// Lighting.Specular *= Shadow.SurfaceShadow;
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// FBxDFEnergyTerms EnergyTerms = ComputeGGXSpecEnergyTerms(GBuffer.Roughness, Context.NoV, GBuffer.SpecularColor);
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// Add energy presevation (i.e. attenuation of the specular layer onto the diffuse component
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// Lighting.Diffuse *= ComputeEnergyPreservation(EnergyTerms);
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Lighting.Specular = 0;
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Lighting.Transmission = 0;
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return Lighting;
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}
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FDirectLighting IntegrateBxDF( FGBufferData GBuffer, half3 N, half3 V, half3 L, float Falloff, half NoL, FAreaLight AreaLight, FShadowTerms Shadow )
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{
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switch( GBuffer.ShadingModelID )
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{
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case SHADINGMODELID_DEFAULT_LIT:
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case SHADINGMODELID_SINGLELAYERWATER:
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case SHADINGMODELID_THIN_TRANSLUCENT:
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return DefaultLitBxDF( GBuffer, N, V, L, Falloff, NoL, AreaLight, Shadow );
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case SHADINGMODELID_SUBSURFACE:
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return SubsurfaceBxDF( GBuffer, N, V, L, Falloff, NoL, AreaLight, Shadow );
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case SHADINGMODELID_PREINTEGRATED_SKIN:
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return PreintegratedSkinBxDF( GBuffer, N, V, L, Falloff, NoL, AreaLight, Shadow );
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case SHADINGMODELID_CLEAR_COAT:
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return ClearCoatBxDF( GBuffer, N, V, L, Falloff, NoL, AreaLight, Shadow );
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case SHADINGMODELID_SUBSURFACE_PROFILE:
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return SubsurfaceProfileBxDF( GBuffer, N, V, L, Falloff, NoL, AreaLight, Shadow );
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case SHADINGMODELID_TWOSIDED_FOLIAGE:
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return TwoSidedBxDF( GBuffer, N, V, L, Falloff, NoL, AreaLight, Shadow );
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case SHADINGMODELID_HAIR:
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return HairBxDF( GBuffer, N, V, L, Falloff, NoL, AreaLight, Shadow );
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case SHADINGMODELID_CLOTH:
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return ClothBxDF( GBuffer, N, V, L, Falloff, NoL, AreaLight, Shadow );
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case SHADINGMODELID_EYE:
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return EyeBxDF( GBuffer, N, V, L, Falloff, NoL, AreaLight, Shadow );
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case SHADINGMODELID_TOON_BASE:
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return ToonCustomBxDF( GBuffer, N, V, L, Falloff, NoL, AreaLight, Shadow );
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case SHADINGMODELID_TOON_PBR:
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case SHADINGMODELID_TOON_SKIN:
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return ToonLitBxDF( GBuffer, N, V, L, Falloff, NoL, AreaLight, Shadow );
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default:
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return (FDirectLighting)0;
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}
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}
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```
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## DeferredLightPixelShaders.usf
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# PostProcess
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## ToneMapping
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c++部分主要修改了：
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@ -51,8 +414,6 @@ c++部分主要修改了：
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***实现向ToneMaper Shader传递 `TRDGUniformBufferRef<FSceneTextureUniformParameters>`的功能***
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之后再PostProcessTonemap.usf中，对**CustomStencil**进行判断，如果为true，则直接返回之前渲染结果。实际上BufferVisualization里根本看不出来。
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||||
|
||||
|
||||
```c++
|
||||
#include "DeferredShadingCommon.ush"
|
||||
|
||||
@ -86,4 +447,34 @@ void MainPS(
|
||||
}
|
||||
```
|
||||
|
||||
## Lut
|
||||
## PostProcessCombineLUT.usf
|
||||
主要移植了UE4版本的LUT，以此保证效果统一。
|
||||
|
||||
# 其他
|
||||
## GpuSkinCacheComputeShader.usf
|
||||
注释2行代码，用处不明。
|
||||
```c++
|
||||
#if GPUSKIN_MORPH_BLEND
|
||||
{
|
||||
Intermediates.UnpackedPosition += Unpacked.DeltaPosition;
|
||||
// calc new normal by offseting it with the delta
|
||||
LocalTangentZ = normalize( LocalTangentZ + Unpacked.DeltaTangentZ);
|
||||
// derive the new tangent by orthonormalizing the new normal against
|
||||
// the base tangent vector (assuming these are normalized)
|
||||
LocalTangentX = normalize( LocalTangentX - (dot(LocalTangentX, LocalTangentZ) * LocalTangentZ) );
|
||||
}#else
|
||||
#if GPUSKIN_APEX_CLOTH
|
||||
```
|
||||
=>
|
||||
```c++
|
||||
#if GPUSKIN_MORPH_BLEND
|
||||
{
|
||||
Intermediates.UnpackedPosition += Unpacked.DeltaPosition;
|
||||
// calc new normal by offseting it with the delta
|
||||
//LocalTangentZ = normalize( LocalTangentZ + Unpacked.DeltaTangentZ);
|
||||
// derive the new tangent by orthonormalizing the new normal against
|
||||
// the base tangent vector (assuming these are normalized)
|
||||
//LocalTangentX = normalize( LocalTangentX - (dot(LocalTangentX, LocalTangentZ) * LocalTangentZ) );
|
||||
}#else
|
||||
#if GPUSKIN_APEX_CLOTH
|
||||
```
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user