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} |
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// This function is use to help with debugging and must be implemented by any lit material |
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// Implementer must take into account what are the current override component and |
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// Implementer must take into account what are the current override component and |
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// adjust SurfaceData properties accordingdly |
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void ApplyDebugToSurfaceData(float3x3 worldToTangent, inout SurfaceData surfaceData) |
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{ |
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// GBuffer2 and GBuffer0.a interpretation depends on material feature enabled |
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//GBuffer0 RGBA8 sRGB Gbuffer0 encode baseColor and so is sRGB to save precision. Alpha is not affected. |
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//GBuffer1 R10B10G10A2 |
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//GBuffer1 RGBA8 |
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//GBuffer2 RGBA8 |
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//GBuffer3 RGBA8 |
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//GBuffer1 perceptualRoughness, normal.x, normal.y, normal.sign |
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//GBuffer1 normal.xy (1212), perceptualRoughness |
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//GBuffer1 perceptualRoughness, normal.x, normal.y, normal.sign |
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//GBuffer1 normal.xy (1212), perceptualRoughness |
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//GBuffer1 perceptualRoughness, normal.x, normal.y, normal.sign |
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//GBuffer1 normal.xy (1212), perceptualRoughness |
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//GBuffer1 perceptualRoughness, normal.x, normal.y, normal.sign |
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//GBuffer1 normal.xy (1212), perceptualRoughness |
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//GBuffer2 IOR, thickness, unused(3bit) / metallic(5), featureID(3) / coatMask(5) |
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//GBuffer3 bakedDiffuseLighting.rgb |
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// Isolate material features. |
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tileFeatureFlags &= MATERIAL_FEATURE_MASK_FLAGS; |
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bsdfData.materialFeatures = tileFeatureFlags; // Only tile-uniform feature evaluation |
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GBufferType0 inGBuffer0 = LOAD_TEXTURE2D(_GBufferTexture0, positionSS); |
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GBufferType1 inGBuffer1 = LOAD_TEXTURE2D(_GBufferTexture1, positionSS); |
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GBufferType2 inGBuffer2 = LOAD_TEXTURE2D(_GBufferTexture2, positionSS); |
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pixelFeatureFlags |= tileFeatureFlags & (pixelHasAnisotropy ? MATERIALFEATUREFLAGS_LIT_ANISOTROPY : 0); |
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pixelFeatureFlags |= tileFeatureFlags & (pixelHasIridescence ? MATERIALFEATUREFLAGS_LIT_IRIDESCENCE : 0); |
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pixelFeatureFlags |= tileFeatureFlags & (pixelHasClearCoat ? MATERIALFEATUREFLAGS_LIT_CLEAR_COAT : 0); |
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// In the case of material classification we assign tileFeatureFlags to bsdfData.materialFeatures |
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// This mean that the branch inside the tile will be the same (coherency). Remember that a divergent branch |
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// on AMD GCN mean we will execute both branch for all fragement. We setup at pixel level values |
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// such that a particular branch will not have effect if it shouldn't. For example if SSS is enabled, |
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// setup a sssMask of 0 don't have any effect and we can safely take the SSS branch for the tile. |
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// Note that in the catch all variant of material classification we get the value from the structure buffer done |
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// in the classification pass. Mean even in catch all, we it is high likely that we don't have tileFeatureFlags == MATERIAL_FEATURE_MASK_FLAGS case. |
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// tileFeatureFlags == MATERIAL_FEATURE_MASK_FLAGS can appear in following situation |
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// call from deferred.shader or other shader that doesn't peform material classification |
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// call from last catch all variant in material classification, which mean we have all possible material inside a same tile (very rare) |
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// call from a specific case in material classification (currently we have variant 0) |
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// When this happen, we prefer to use the pixelFeatureFlags rather than the tileFeatureFlags as bsdfData.materialFeatures |
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// because there is more likelihood to save performance (excep in the very rare case of catch all of material classification). |
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// We can indeed have divergence inside a tile (like having aniso and not aniso) |
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// but it is more likely that the whole time is convergent (like everything have SSS and clear coat). |
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if (tileFeatureFlags == MATERIAL_FEATURE_MASK_FLAGS) |
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{ |
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bsdfData.materialFeatures = pixelFeatureFlags; |
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tileFeatureFlags = pixelFeatureFlags; // Required for the aniso test (see below) |
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} |
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else |
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{ |
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bsdfData.materialFeatures = tileFeatureFlags; |
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} |
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// Decompress feature-agnostic data from the G-Buffer. |
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float3 baseColor = inGBuffer0.rgb; |
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