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2067 行
96 KiB
2067 行
96 KiB
//-----------------------------------------------------------------------------
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// Includes
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//-----------------------------------------------------------------------------
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// SurfaceData is define in Lit.cs which generate Lit.cs.hlsl
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#include "Lit.cs.hlsl"
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// Those define allow to include desired SSS/Transmission functions
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#define MATERIAL_INCLUDE_SUBSURFACESCATTERING
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#define MATERIAL_INCLUDE_TRANSMISSION
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#include "HDRP/Material/SubsurfaceScattering/SubsurfaceScattering.hlsl"
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#include "HDRP/Material/NormalBuffer.hlsl"
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#include "CoreRP/ShaderLibrary/VolumeRendering.hlsl"
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//-----------------------------------------------------------------------------
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// Configuration
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//-----------------------------------------------------------------------------
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// Choose between Lambert diffuse and Disney diffuse (enable only one of them)
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// #define USE_DIFFUSE_LAMBERT_BRDF
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#define LIT_USE_GGX_ENERGY_COMPENSATION
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// Enable reference mode for IBL and area lights
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// Both reference define below can be define only if LightLoop is present, else we get a compile error
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#ifdef HAS_LIGHTLOOP
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// #define LIT_DISPLAY_REFERENCE_AREA
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// #define LIT_DISPLAY_REFERENCE_IBL
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#endif
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// In forward we can chose between reading the normal from the normalBufferTexture or computing it again
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// This is tradeoff between performance and quality. As we store the normal conpressed, recomputing again is higher quality.
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// Uncomment this to get speed (to measure), let it comment to get quality
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// #define FORWARD_MATERIAL_READ_FROM_WRITTEN_NORMAL_BUFFER
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//-----------------------------------------------------------------------------
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// Texture and constant buffer declaration
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//-----------------------------------------------------------------------------
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// GBuffer texture declaration
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TEXTURE2D(_GBufferTexture0);
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TEXTURE2D(_GBufferTexture1);
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TEXTURE2D(_GBufferTexture2);
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TEXTURE2D(_GBufferTexture3); // Bake lighting and/or emissive
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TEXTURE2D(_GBufferTexture4); // Light layer or shadow mask
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TEXTURE2D(_GBufferTexture5); // shadow mask
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TEXTURE2D(_LightLayersTexture);
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#ifdef SHADOWS_SHADOWMASK
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TEXTURE2D(_ShadowMaskTexture); // Alias for shadow mask, so we don't need to know which gbuffer is used for shadow mask
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#endif
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#include "HDRP/Material/LTCAreaLight/LTCAreaLight.hlsl"
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#include "HDRP/Material/PreIntegratedFGD/PreIntegratedFGD.hlsl"
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//-----------------------------------------------------------------------------
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// Definition
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//-----------------------------------------------------------------------------
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#define GBufferType0 float4
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#define GBufferType1 float4
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#define GBufferType2 float4
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#define GBufferType3 float4
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#define GBufferType4 float4
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#define GBufferType5 float4
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#ifdef LIGHT_LAYERS
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#define GBUFFERMATERIAL_LIGHT_LAYERS 1
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#else
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#define GBUFFERMATERIAL_LIGHT_LAYERS 0
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#endif
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#ifdef SHADOWS_SHADOWMASK
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#define GBUFFERMATERIAL_SHADOWMASK 1
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#else
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#define GBUFFERMATERIAL_SHADOWMASK 0
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#endif
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// Caution: This must be in sync with Lit.cs GetMaterialGBufferCount()
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#define GBUFFERMATERIAL_COUNT (4 + GBUFFERMATERIAL_LIGHT_LAYERS + GBUFFERMATERIAL_SHADOWMASK)
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#if defined(LIGHT_LAYERS) && defined(SHADOWS_SHADOWMASK)
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#define OUT_GBUFFER_LIGHT_LAYERS outGBuffer4
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#define OUT_GBUFFER_SHADOWMASK outGBuffer5
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#elif defined(LIGHT_LAYERS)
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#define OUT_GBUFFER_LIGHT_LAYERS outGBuffer4
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#elif defined(SHADOWS_SHADOWMASK)
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#define OUT_GBUFFER_SHADOWMASK outGBuffer4
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#endif
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#define HAS_REFRACTION (defined(_REFRACTION_PLANE) || defined(_REFRACTION_SPHERE)) && (defined(_REFRACTION_SSRAY_PROXY) || defined(_REFRACTION_SSRAY_HIZ))
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#define DEFAULT_SPECULAR_VALUE 0.04
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// Enum for materialFeatureId (only use for encode/decode GBuffer)
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#define GBUFFER_LIT_STANDARD 0
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// we have not enough space (3bit) to store mat feature to have SSS and Transmission as bitmask, such why we have all variant
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#define GBUFFER_LIT_SSS 1
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#define GBUFFER_LIT_TRANSMISSION 2
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#define GBUFFER_LIT_TRANSMISSION_SSS 3
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#define GBUFFER_LIT_ANISOTROPIC 4
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#define GBUFFER_LIT_IRIDESCENCE 5 // TODO
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#define CLEAR_COAT_IOR 1.5
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#define CLEAR_COAT_IETA (1.0 / CLEAR_COAT_IOR) // IETA is the inverse eta which is the ratio of IOR of two interface
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#define CLEAR_COAT_F0 0.04 // IORToFresnel0(CLEAR_COAT_IOR)
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#define CLEAR_COAT_ROUGHNESS 0.03
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#define CLEAR_COAT_PERCEPTUAL_SMOOTHNESS RoughnessToPerceptualSmoothness(CLEAR_COAT_ROUGHNESS)
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#define CLEAR_COAT_PERCEPTUAL_ROUGHNESS RoughnessToPerceptualRoughness(CLEAR_COAT_ROUGHNESS)
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//-----------------------------------------------------------------------------
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// Light and material classification for the deferred rendering path
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// Configure what kind of combination is supported
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//-----------------------------------------------------------------------------
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// Lighting architecture and material are suppose to be decoupled files.
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// However as we use material classification it is hard to be fully separated
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// the dependecy is define in this include where there is shared define for material and lighting in case of deferred material.
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// If a user do a lighting architecture without material classification, this can be remove
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#include "../../Lighting/LightLoop/LightLoop.cs.hlsl"
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// Currently disable SSR until critical editor fix is available
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#undef LIGHTFEATUREFLAGS_SSREFLECTION
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#define LIGHTFEATUREFLAGS_SSREFLECTION 0
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// Combination need to be define in increasing "comlexity" order as define by FeatureFlagsToTileVariant
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static const uint kFeatureVariantFlags[NUM_FEATURE_VARIANTS] =
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{
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// Precomputed illumination (no dynamic lights) for all material types
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/* 0 */ LIGHTFEATUREFLAGS_SKY | LIGHTFEATUREFLAGS_ENV | LIGHTFEATUREFLAGS_SSREFLECTION | MATERIAL_FEATURE_MASK_FLAGS,
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/* 1 */ LIGHTFEATUREFLAGS_SKY | LIGHTFEATUREFLAGS_DIRECTIONAL | LIGHTFEATUREFLAGS_PUNCTUAL | MATERIALFEATUREFLAGS_LIT_STANDARD,
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/* 2 */ LIGHTFEATUREFLAGS_SKY | LIGHTFEATUREFLAGS_DIRECTIONAL | LIGHTFEATUREFLAGS_AREA | MATERIALFEATUREFLAGS_LIT_STANDARD,
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/* 3 */ LIGHTFEATUREFLAGS_SKY | LIGHTFEATUREFLAGS_DIRECTIONAL | LIGHTFEATUREFLAGS_ENV | LIGHTFEATUREFLAGS_SSREFLECTION | MATERIALFEATUREFLAGS_LIT_STANDARD,
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/* 4 */ LIGHTFEATUREFLAGS_SKY | LIGHTFEATUREFLAGS_DIRECTIONAL | LIGHTFEATUREFLAGS_PUNCTUAL | LIGHTFEATUREFLAGS_ENV | LIGHTFEATUREFLAGS_SSREFLECTION | MATERIALFEATUREFLAGS_LIT_STANDARD,
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/* 5 */ LIGHT_FEATURE_MASK_FLAGS_OPAQUE | MATERIALFEATUREFLAGS_LIT_STANDARD,
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// Standard with SSS and Transmission
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/* 6 */ LIGHTFEATUREFLAGS_SKY | LIGHTFEATUREFLAGS_DIRECTIONAL | LIGHTFEATUREFLAGS_PUNCTUAL | MATERIALFEATUREFLAGS_LIT_SUBSURFACE_SCATTERING | MATERIALFEATUREFLAGS_LIT_TRANSMISSION | MATERIALFEATUREFLAGS_LIT_STANDARD,
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/* 7 */ LIGHTFEATUREFLAGS_SKY | LIGHTFEATUREFLAGS_DIRECTIONAL | LIGHTFEATUREFLAGS_AREA | MATERIALFEATUREFLAGS_LIT_SUBSURFACE_SCATTERING | MATERIALFEATUREFLAGS_LIT_TRANSMISSION | MATERIALFEATUREFLAGS_LIT_STANDARD,
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/* 8 */ LIGHTFEATUREFLAGS_SKY | LIGHTFEATUREFLAGS_DIRECTIONAL | LIGHTFEATUREFLAGS_ENV | LIGHTFEATUREFLAGS_SSREFLECTION | MATERIALFEATUREFLAGS_LIT_SUBSURFACE_SCATTERING | MATERIALFEATUREFLAGS_LIT_TRANSMISSION | MATERIALFEATUREFLAGS_LIT_STANDARD,
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/* 9 */ LIGHTFEATUREFLAGS_SKY | LIGHTFEATUREFLAGS_DIRECTIONAL | LIGHTFEATUREFLAGS_PUNCTUAL | LIGHTFEATUREFLAGS_ENV | LIGHTFEATUREFLAGS_SSREFLECTION | MATERIALFEATUREFLAGS_LIT_SUBSURFACE_SCATTERING | MATERIALFEATUREFLAGS_LIT_TRANSMISSION | MATERIALFEATUREFLAGS_LIT_STANDARD,
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/* 10 */ LIGHT_FEATURE_MASK_FLAGS_OPAQUE | MATERIALFEATUREFLAGS_LIT_SUBSURFACE_SCATTERING | MATERIALFEATUREFLAGS_LIT_TRANSMISSION | MATERIALFEATUREFLAGS_LIT_STANDARD,
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// Anisotropy
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/* 11 */ LIGHTFEATUREFLAGS_SKY | LIGHTFEATUREFLAGS_DIRECTIONAL | LIGHTFEATUREFLAGS_PUNCTUAL | MATERIALFEATUREFLAGS_LIT_ANISOTROPY | MATERIALFEATUREFLAGS_LIT_STANDARD,
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/* 12 */ LIGHTFEATUREFLAGS_SKY | LIGHTFEATUREFLAGS_DIRECTIONAL | LIGHTFEATUREFLAGS_AREA | MATERIALFEATUREFLAGS_LIT_ANISOTROPY | MATERIALFEATUREFLAGS_LIT_STANDARD,
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/* 13 */ LIGHTFEATUREFLAGS_SKY | LIGHTFEATUREFLAGS_DIRECTIONAL | LIGHTFEATUREFLAGS_ENV | LIGHTFEATUREFLAGS_SSREFLECTION | MATERIALFEATUREFLAGS_LIT_ANISOTROPY | MATERIALFEATUREFLAGS_LIT_STANDARD,
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/* 14 */ LIGHTFEATUREFLAGS_SKY | LIGHTFEATUREFLAGS_DIRECTIONAL | LIGHTFEATUREFLAGS_PUNCTUAL | LIGHTFEATUREFLAGS_ENV | LIGHTFEATUREFLAGS_SSREFLECTION | MATERIALFEATUREFLAGS_LIT_ANISOTROPY | MATERIALFEATUREFLAGS_LIT_STANDARD,
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/* 15 */ LIGHT_FEATURE_MASK_FLAGS_OPAQUE | MATERIALFEATUREFLAGS_LIT_ANISOTROPY | MATERIALFEATUREFLAGS_LIT_STANDARD,
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// Standard with clear coat
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/* 16 */ LIGHTFEATUREFLAGS_SKY | LIGHTFEATUREFLAGS_DIRECTIONAL | LIGHTFEATUREFLAGS_PUNCTUAL | MATERIALFEATUREFLAGS_LIT_CLEAR_COAT | MATERIALFEATUREFLAGS_LIT_STANDARD,
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/* 17 */ LIGHTFEATUREFLAGS_SKY | LIGHTFEATUREFLAGS_DIRECTIONAL | LIGHTFEATUREFLAGS_AREA | MATERIALFEATUREFLAGS_LIT_CLEAR_COAT | MATERIALFEATUREFLAGS_LIT_STANDARD,
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/* 18 */ LIGHTFEATUREFLAGS_SKY | LIGHTFEATUREFLAGS_DIRECTIONAL | LIGHTFEATUREFLAGS_ENV | LIGHTFEATUREFLAGS_SSREFLECTION | MATERIALFEATUREFLAGS_LIT_CLEAR_COAT | MATERIALFEATUREFLAGS_LIT_STANDARD,
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/* 19 */ LIGHTFEATUREFLAGS_SKY | LIGHTFEATUREFLAGS_DIRECTIONAL | LIGHTFEATUREFLAGS_PUNCTUAL | LIGHTFEATUREFLAGS_ENV | LIGHTFEATUREFLAGS_SSREFLECTION | MATERIALFEATUREFLAGS_LIT_CLEAR_COAT | MATERIALFEATUREFLAGS_LIT_STANDARD,
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/* 20 */ LIGHT_FEATURE_MASK_FLAGS_OPAQUE | MATERIALFEATUREFLAGS_LIT_CLEAR_COAT | MATERIALFEATUREFLAGS_LIT_STANDARD,
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// Standard with Iridescence
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/* 21 */ LIGHTFEATUREFLAGS_SKY | LIGHTFEATUREFLAGS_DIRECTIONAL | LIGHTFEATUREFLAGS_PUNCTUAL | MATERIALFEATUREFLAGS_LIT_IRIDESCENCE | MATERIALFEATUREFLAGS_LIT_STANDARD,
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/* 22 */ LIGHTFEATUREFLAGS_SKY | LIGHTFEATUREFLAGS_DIRECTIONAL | LIGHTFEATUREFLAGS_AREA | MATERIALFEATUREFLAGS_LIT_IRIDESCENCE | MATERIALFEATUREFLAGS_LIT_STANDARD,
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/* 23 */ LIGHTFEATUREFLAGS_SKY | LIGHTFEATUREFLAGS_DIRECTIONAL | LIGHTFEATUREFLAGS_ENV | LIGHTFEATUREFLAGS_SSREFLECTION | MATERIALFEATUREFLAGS_LIT_IRIDESCENCE | MATERIALFEATUREFLAGS_LIT_STANDARD,
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/* 24 */ LIGHTFEATUREFLAGS_SKY | LIGHTFEATUREFLAGS_DIRECTIONAL | LIGHTFEATUREFLAGS_PUNCTUAL | LIGHTFEATUREFLAGS_ENV | LIGHTFEATUREFLAGS_SSREFLECTION | MATERIALFEATUREFLAGS_LIT_IRIDESCENCE | MATERIALFEATUREFLAGS_LIT_STANDARD,
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/* 25 */ LIGHT_FEATURE_MASK_FLAGS_OPAQUE | MATERIALFEATUREFLAGS_LIT_IRIDESCENCE | MATERIALFEATUREFLAGS_LIT_STANDARD,
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/* 26 */ LIGHT_FEATURE_MASK_FLAGS_OPAQUE | MATERIAL_FEATURE_MASK_FLAGS, // Catch all case with MATERIAL_FEATURE_MASK_FLAGS is needed in case we disable material classification
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};
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uint FeatureFlagsToTileVariant(uint featureFlags)
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{
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for (int i = 0; i < NUM_FEATURE_VARIANTS; i++)
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{
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if ((featureFlags & kFeatureVariantFlags[i]) == featureFlags)
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return i;
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}
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return NUM_FEATURE_VARIANTS - 1;
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}
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#ifdef USE_INDIRECT
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uint TileVariantToFeatureFlags(uint variant, uint tileIndex)
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{
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if (variant == NUM_FEATURE_VARIANTS - 1)
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{
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// We don't have any compile-time feature information.
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// Therefore, we load the feature classification data at runtime to avoid
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// entering every single branch based on feature flags.
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return g_TileFeatureFlags[tileIndex];
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}
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else
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{
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// Return the compile-time feature flags.
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return kFeatureVariantFlags[variant];
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}
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}
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#endif // USE_INDIRECT
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//-----------------------------------------------------------------------------
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// Helper functions/variable specific to this material
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//-----------------------------------------------------------------------------
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// SSReflection
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#include "HDRP/Lighting/LightDefinition.cs.hlsl"
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#include "HDRP/Lighting/Reflection/VolumeProjection.hlsl"
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#include "HDRP/Lighting/ScreenSpaceLighting/ScreenSpaceLighting.hlsl"
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#if HAS_REFRACTION
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#if defined(_REFRACTION_PLANE)
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#define REFRACTION_MODEL(V, posInputs, bsdfData) RefractionModelPlane(V, posInputs.positionWS, bsdfData.normalWS, bsdfData.ior, bsdfData.thickness)
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#elif defined(_REFRACTION_SPHERE)
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#define REFRACTION_MODEL(V, posInputs, bsdfData) RefractionModelSphere(V, posInputs.positionWS, bsdfData.normalWS, bsdfData.ior, bsdfData.thickness)
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#endif
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#endif
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// Assume bsdfData.normalWS is init
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void FillMaterialAnisotropy(float anisotropy, float3 tangentWS, float3 bitangentWS, inout BSDFData bsdfData)
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{
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bsdfData.anisotropy = anisotropy;
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bsdfData.tangentWS = tangentWS;
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bsdfData.bitangentWS = bitangentWS;
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}
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void FillMaterialIridescence(float mask, float thickness, inout BSDFData bsdfData)
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{
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bsdfData.iridescenceMask = mask;
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bsdfData.iridescenceThickness = thickness;
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}
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// Note: this modify the parameter perceptualRoughness and fresnel0, so they need to be setup
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void FillMaterialClearCoatData(float coatMask, inout BSDFData bsdfData)
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{
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bsdfData.coatMask = coatMask;
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float ieta = lerp(1.0, CLEAR_COAT_IETA, bsdfData.coatMask);
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bsdfData.coatRoughness = CLEAR_COAT_ROUGHNESS;
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// Approx to deal with roughness appearance of base layer (should appear rougher)
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float coatRoughnessScale = Sq(ieta);
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float sigma = RoughnessToVariance(PerceptualRoughnessToRoughness(bsdfData.perceptualRoughness));
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bsdfData.perceptualRoughness = RoughnessToPerceptualRoughness(VarianceToRoughness(sigma * coatRoughnessScale));
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}
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void FillMaterialTransparencyData(float3 baseColor, float metallic, float ior, float3 transmittanceColor, float atDistance, float thickness, float transmittanceMask, inout BSDFData bsdfData)
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{
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// Uses thickness from SSS's property set
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bsdfData.ior = ior;
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// IOR define the fresnel0 value, so update it also for consistency (and even if not physical we still need to take into account any metal mask)
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bsdfData.fresnel0 = lerp(IorToFresnel0(ior).xxx, baseColor, metallic);
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bsdfData.absorptionCoefficient = TransmittanceColorAtDistanceToAbsorption(transmittanceColor, atDistance);
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bsdfData.transmittanceMask = transmittanceMask;
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bsdfData.thickness = max(thickness, 0.0001);
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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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// adjust SurfaceData properties accordingdly
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void ApplyDebugToSurfaceData(float3x3 worldToTangent, inout SurfaceData surfaceData)
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{
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#ifdef DEBUG_DISPLAY
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// Override value if requested by user
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// this can be use also in case of debug lighting mode like diffuse only
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bool overrideAlbedo = _DebugLightingAlbedo.x != 0.0;
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bool overrideSmoothness = _DebugLightingSmoothness.x != 0.0;
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bool overrideNormal = _DebugLightingNormal.x != 0.0;
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if (overrideAlbedo)
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{
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float3 overrideAlbedoValue = _DebugLightingAlbedo.yzw;
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surfaceData.baseColor = overrideAlbedoValue;
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}
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if (overrideSmoothness)
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{
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float overrideSmoothnessValue = _DebugLightingSmoothness.y;
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surfaceData.perceptualSmoothness = overrideSmoothnessValue;
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}
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if (overrideNormal)
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{
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surfaceData.normalWS = worldToTangent[2];
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}
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#endif
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}
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// This function is similar to ApplyDebugToSurfaceData but for BSDFData
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void ApplyDebugToBSDFData(inout BSDFData bsdfData)
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{
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#ifdef DEBUG_DISPLAY
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// Override value if requested by user
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// this can be use also in case of debug lighting mode like specular only
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bool overrideSpecularColor = _DebugLightingSpecularColor.x != 0.0;
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if (overrideSpecularColor)
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{
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float3 overrideSpecularColor = _DebugLightingSpecularColor.yzw;
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bsdfData.fresnel0 = overrideSpecularColor;
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}
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#endif
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}
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SSSData ConvertSurfaceDataToSSSData(SurfaceData surfaceData)
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{
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SSSData sssData;
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sssData.diffuseColor = surfaceData.baseColor;
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sssData.subsurfaceMask = surfaceData.subsurfaceMask;
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sssData.diffusionProfile = surfaceData.diffusionProfile;
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return sssData;
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}
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NormalData ConvertSurfaceDataToNormalData(SurfaceData surfaceData)
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{
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NormalData normalData;
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// Note: We can't handle clear coat material here, we have only one slot to store smoothness
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// and the buffer is the GBuffer1.
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normalData.normalWS = surfaceData.normalWS;
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normalData.perceptualRoughness = PerceptualSmoothnessToPerceptualRoughness(surfaceData.perceptualSmoothness);
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return normalData;
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}
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void UpdateSurfaceDataFromNormalData(uint2 positionSS, inout BSDFData bsdfData)
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{
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NormalData normalData;
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DecodeFromNormalBuffer(positionSS, normalData);
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bsdfData.normalWS = normalData.normalWS;
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bsdfData.perceptualRoughness = normalData.perceptualRoughness;
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}
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//-----------------------------------------------------------------------------
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// conversion function for forward
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//-----------------------------------------------------------------------------
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BSDFData ConvertSurfaceDataToBSDFData(uint2 positionSS, SurfaceData surfaceData)
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{
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BSDFData bsdfData;
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ZERO_INITIALIZE(BSDFData, bsdfData);
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// IMPORTANT: In case of foward or gbuffer pass all enable flags are statically know at compile time, so the compiler can do compile time optimization
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bsdfData.materialFeatures = surfaceData.materialFeatures;
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// Standard material
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bsdfData.ambientOcclusion = surfaceData.ambientOcclusion;
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bsdfData.specularOcclusion = surfaceData.specularOcclusion;
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bsdfData.normalWS = surfaceData.normalWS;
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bsdfData.perceptualRoughness = PerceptualSmoothnessToPerceptualRoughness(surfaceData.perceptualSmoothness);
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// Check if we read value of normal and roughness from buffer. This is a tradeoff
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#ifdef FORWARD_MATERIAL_READ_FROM_WRITTEN_NORMAL_BUFFER
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#if (SHADERPASS == SHADERPASS_FORWARD) && !defined(_SURFACE_TYPE_TRANSPARENT)
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UpdateSurfaceDataFromNormalData(positionSS, bsdfData);
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#endif
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#endif
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// There is no metallic with SSS and specular color mode
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float metallic = HasFlag(surfaceData.materialFeatures, MATERIALFEATUREFLAGS_LIT_SPECULAR_COLOR | MATERIALFEATUREFLAGS_LIT_SUBSURFACE_SCATTERING | MATERIALFEATUREFLAGS_LIT_TRANSMISSION) ? 0.0 : surfaceData.metallic;
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bsdfData.diffuseColor = ComputeDiffuseColor(surfaceData.baseColor, metallic);
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bsdfData.fresnel0 = HasFlag(surfaceData.materialFeatures, MATERIALFEATUREFLAGS_LIT_SPECULAR_COLOR) ? surfaceData.specularColor : ComputeFresnel0(surfaceData.baseColor, surfaceData.metallic, DEFAULT_SPECULAR_VALUE);
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// Note: we have ZERO_INITIALIZE the struct so bsdfData.anisotropy == 0.0
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// Note: DIFFUSION_PROFILE_NEUTRAL_ID is 0
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// In forward everything is statically know and we could theorically cumulate all the material features. So the code reflect it.
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// However in practice we keep parity between deferred and forward, so we should constrain the various features.
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// The UI is in charge of setuping the constrain, not the code. So if users is forward only and want unleash power, it is easy to unleash by some UI change
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if (HasFlag(surfaceData.materialFeatures, MATERIALFEATUREFLAGS_LIT_SUBSURFACE_SCATTERING))
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{
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// Assign profile id and overwrite fresnel0
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FillMaterialSSS(surfaceData.diffusionProfile, surfaceData.subsurfaceMask, bsdfData);
|
|
}
|
|
|
|
if (HasFlag(surfaceData.materialFeatures, MATERIALFEATUREFLAGS_LIT_TRANSMISSION))
|
|
{
|
|
// Assign profile id and overwrite fresnel0
|
|
FillMaterialTransmission(surfaceData.diffusionProfile, surfaceData.thickness, bsdfData);
|
|
}
|
|
|
|
if (HasFlag(surfaceData.materialFeatures, MATERIALFEATUREFLAGS_LIT_ANISOTROPY))
|
|
{
|
|
FillMaterialAnisotropy(surfaceData.anisotropy, surfaceData.tangentWS, cross(surfaceData.normalWS, surfaceData.tangentWS), bsdfData);
|
|
}
|
|
|
|
if (HasFlag(surfaceData.materialFeatures, MATERIALFEATUREFLAGS_LIT_IRIDESCENCE))
|
|
{
|
|
FillMaterialIridescence(surfaceData.iridescenceMask, surfaceData.iridescenceThickness, bsdfData);
|
|
}
|
|
|
|
if (HasFlag(surfaceData.materialFeatures, MATERIALFEATUREFLAGS_LIT_CLEAR_COAT))
|
|
{
|
|
// Modify perceptualRoughness
|
|
FillMaterialClearCoatData(surfaceData.coatMask, bsdfData);
|
|
}
|
|
|
|
// roughnessT and roughnessB are clamped, and are meant to be used with punctual and directional lights.
|
|
// perceptualRoughness is not clamped, and is meant to be used for IBL.
|
|
// perceptualRoughness can be modify by FillMaterialClearCoatData, so ConvertAnisotropyToClampRoughness must be call after
|
|
ConvertAnisotropyToClampRoughness(bsdfData.perceptualRoughness, bsdfData.anisotropy, bsdfData.roughnessT, bsdfData.roughnessB);
|
|
|
|
#if HAS_REFRACTION
|
|
// Note: Reuse thickness of transmission's property set
|
|
FillMaterialTransparencyData( surfaceData.baseColor, surfaceData.metallic, surfaceData.ior, surfaceData.transmittanceColor, surfaceData.atDistance,
|
|
surfaceData.thickness, surfaceData.transmittanceMask, bsdfData);
|
|
#endif
|
|
|
|
ApplyDebugToBSDFData(bsdfData);
|
|
|
|
return bsdfData;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// conversion function for deferred
|
|
//-----------------------------------------------------------------------------
|
|
|
|
// GBuffer layout.
|
|
// GBuffer2 and GBuffer0.a interpretation depends on material feature enabled
|
|
|
|
//GBuffer0 RGBA8 sRGB Gbuffer0 encode baseColor and so is sRGB to save precision. Alpha is not affected.
|
|
//GBuffer1 RGBA8
|
|
//GBuffer2 RGBA8
|
|
//GBuffer3 RGBA8
|
|
|
|
|
|
//FeatureName Standard
|
|
//GBuffer0 baseColor.r, baseColor.g, baseColor.b, specularOcclusion
|
|
//GBuffer1 normal.xy (1212), perceptualRoughness
|
|
//GBuffer2 f0.r, f0.g, f0.b, featureID(3) / coatMask(5)
|
|
//GBuffer3 bakedDiffuseLighting.rgb
|
|
|
|
//FeatureName Subsurface Scattering + Transmission
|
|
//GBuffer0 baseColor.r, baseColor.g, baseColor.b, diffusionProfile(4) / subsurfaceMask(4)
|
|
//GBuffer1 normal.xy (1212), perceptualRoughness
|
|
//GBuffer2 specularOcclusion, thickness, diffusionProfile(4) / subsurfaceMask(4), featureID(3) / coatMask(5)
|
|
//GBuffer3 bakedDiffuseLighting.rgb
|
|
|
|
//FeatureName Anisotropic
|
|
//GBuffer0 baseColor.r, baseColor.g, baseColor.b, specularOcclusion
|
|
//GBuffer1 normal.xy (1212), perceptualRoughness
|
|
//GBuffer2 anisotropy, tangent.x, tangent.y(3) / metallic(5), featureID(3) / coatMask(5)
|
|
//GBuffer3 bakedDiffuseLighting.rgb
|
|
|
|
//FeatureName Irridescence
|
|
//GBuffer0 baseColor.r, baseColor.g, baseColor.b, specularOcclusion
|
|
//GBuffer1 normal.xy (1212), perceptualRoughness
|
|
//GBuffer2 IOR, thickness, unused(3bit) / metallic(5), featureID(3) / coatMask(5)
|
|
//GBuffer3 bakedDiffuseLighting.rgb
|
|
|
|
// Note:
|
|
// For standard we have chose to always encode fresnel0. Even when we use metal/baseColor parametrization. This avoid
|
|
// compiler optimization problem that was using VGPR to deal with the various combination of metal non metal.
|
|
|
|
// For SSS, we move diffusionProfile(4) / subsurfaceMask(4) in GBuffer0.a so the forward SSS code only need to write into one RT
|
|
// and the SSS postprocess only need to read one RT
|
|
// We duplicate diffusionProfile / subsurfaceMask in GBuffer2.b so the compiler don't need to read the GBuffer0 before PostEvaluateBSDF
|
|
// The lighting code have been adapted to only apply diffuseColor at the end.
|
|
// This save VGPR as we don' need to keep the GBuffer0 value in register.
|
|
|
|
// The layout is also design to only require one RT for the material classification. All the material feature flags are deduced from GBuffer2.
|
|
|
|
// Encode SurfaceData (BSDF parameters) into GBuffer
|
|
// Must be in sync with RT declared in HDRenderPipeline.cs ::Rebuild
|
|
void EncodeIntoGBuffer( SurfaceData surfaceData
|
|
, BuiltinData builtinData
|
|
, uint2 positionSS
|
|
, out GBufferType0 outGBuffer0
|
|
, out GBufferType1 outGBuffer1
|
|
, out GBufferType2 outGBuffer2
|
|
, out GBufferType3 outGBuffer3
|
|
#if GBUFFERMATERIAL_COUNT > 4
|
|
, out GBufferType4 outGBuffer4
|
|
#endif
|
|
#if GBUFFERMATERIAL_COUNT > 5
|
|
, out GBufferType5 outGBuffer5
|
|
#endif
|
|
)
|
|
{
|
|
// RT0 - 8:8:8:8 sRGB
|
|
// Warning: the contents are later overwritten for Standard and SSS!
|
|
outGBuffer0 = float4(surfaceData.baseColor, surfaceData.specularOcclusion);
|
|
|
|
// This encode normalWS and PerceptualSmoothness into GBuffer1
|
|
EncodeIntoNormalBuffer(ConvertSurfaceDataToNormalData(surfaceData), positionSS, outGBuffer1);
|
|
|
|
// RT2 - 8:8:8:8
|
|
uint materialFeatureId;
|
|
|
|
if (HasFlag(surfaceData.materialFeatures, MATERIALFEATUREFLAGS_LIT_SUBSURFACE_SCATTERING | MATERIALFEATUREFLAGS_LIT_TRANSMISSION))
|
|
{
|
|
// Reminder that during GBuffer pass we know statically material materialFeatures
|
|
if ((surfaceData.materialFeatures & (MATERIALFEATUREFLAGS_LIT_SUBSURFACE_SCATTERING | MATERIALFEATUREFLAGS_LIT_TRANSMISSION)) == (MATERIALFEATUREFLAGS_LIT_SUBSURFACE_SCATTERING | MATERIALFEATUREFLAGS_LIT_TRANSMISSION))
|
|
materialFeatureId = GBUFFER_LIT_TRANSMISSION_SSS;
|
|
else if ((surfaceData.materialFeatures & MATERIALFEATUREFLAGS_LIT_SUBSURFACE_SCATTERING) == MATERIALFEATUREFLAGS_LIT_SUBSURFACE_SCATTERING)
|
|
materialFeatureId = GBUFFER_LIT_SSS;
|
|
else
|
|
materialFeatureId = GBUFFER_LIT_TRANSMISSION;
|
|
|
|
// We perform the same encoding for SSS and transmission even if not used as it is the same cost
|
|
// Note that regarding EncodeIntoSSSBuffer, as the lit.shader IS the deferred shader (and the SSS fullscreen pass is based on deferred encoding),
|
|
// it know the details of the encoding, so it is fine to assume here how SSSBuffer0 is encoded
|
|
|
|
// For the SSS feature, the alpha channel is overwritten with (diffusionProfile | subsurfaceMask).
|
|
// It is done so that the SSS pass only has to read a single G-Buffer 0.
|
|
// We move specular occlusion to the red channel of the G-Buffer 2.
|
|
EncodeIntoSSSBuffer(ConvertSurfaceDataToSSSData(surfaceData), positionSS, outGBuffer0);
|
|
|
|
// We duplicate the alpha channel of the G-Buffer 0 (for diffusion profile).
|
|
// It allows us to delay reading the G-Buffer 0 until the end of the deferred lighting shader.
|
|
outGBuffer2.rgb = float3(surfaceData.specularOcclusion, surfaceData.thickness, outGBuffer0.a);
|
|
}
|
|
else if (HasFlag(surfaceData.materialFeatures, MATERIALFEATUREFLAGS_LIT_ANISOTROPY))
|
|
{
|
|
materialFeatureId = GBUFFER_LIT_ANISOTROPIC;
|
|
|
|
// Reconstruct the default tangent frame.
|
|
float3x3 frame = GetLocalFrame(surfaceData.normalWS);
|
|
|
|
// Compute the rotation angle of the actual tangent frame with respect to the default one.
|
|
float sinFrame = dot(surfaceData.tangentWS, frame[1]);
|
|
float cosFrame = dot(surfaceData.tangentWS, frame[0]);
|
|
uint storeSin = abs(sinFrame) < abs(cosFrame) ? 4 : 0;
|
|
uint quadrant = ((sinFrame < 0) ? 1 : 0) | ((cosFrame < 0) ? 2 : 0);
|
|
|
|
// sin [and cos] are approximately linear up to [after] 45 degrees.
|
|
float sinOrCos = min(abs(sinFrame), abs(cosFrame)) * sqrt(2);
|
|
|
|
outGBuffer2.rgb = float3(surfaceData.anisotropy * 0.5 + 0.5,
|
|
sinOrCos,
|
|
PackFloatInt8bit(surfaceData.metallic, storeSin | quadrant, 8));
|
|
}
|
|
else if (HasFlag(surfaceData.materialFeatures, MATERIALFEATUREFLAGS_LIT_IRIDESCENCE))
|
|
{
|
|
materialFeatureId = GBUFFER_LIT_IRIDESCENCE;
|
|
|
|
outGBuffer2.rgb = float3(surfaceData.iridescenceMask, surfaceData.iridescenceThickness,
|
|
PackFloatInt8bit(surfaceData.metallic, 0, 8));
|
|
}
|
|
else // Standard
|
|
{
|
|
// In the case of standard or specular color we always convert to specular color parametrization before encoding,
|
|
// so decoding is more efficient (it allow better optimization for the compiler and save VGPR)
|
|
// This mean that on the decode side, MATERIALFEATUREFLAGS_LIT_SPECULAR_COLOR doesn't exist anymore
|
|
materialFeatureId = GBUFFER_LIT_STANDARD;
|
|
|
|
float3 diffuseColor = surfaceData.baseColor;
|
|
float3 fresnel0 = surfaceData.specularColor;
|
|
|
|
if (!HasFlag(surfaceData.materialFeatures, MATERIALFEATUREFLAGS_LIT_SPECULAR_COLOR))
|
|
{
|
|
// Convert from the metallic parametrization.
|
|
diffuseColor = ComputeDiffuseColor(surfaceData.baseColor, surfaceData.metallic);
|
|
fresnel0 = ComputeFresnel0(surfaceData.baseColor, surfaceData.metallic, DEFAULT_SPECULAR_VALUE);
|
|
}
|
|
|
|
outGBuffer0.rgb = diffuseColor; // sRGB RT
|
|
// outGBuffer2 is not sRGB, so use a fast encode/decode sRGB to keep precision
|
|
outGBuffer2.rgb = FastLinearToSRGB(fresnel0); // TODO: optimize
|
|
}
|
|
|
|
// Ensure that surfaceData.coatMask is 0 if the feature is not enabled
|
|
float coatMask = HasFlag(surfaceData.materialFeatures, MATERIALFEATUREFLAGS_LIT_CLEAR_COAT) ? surfaceData.coatMask : 0.0;
|
|
// Note: no need to store MATERIALFEATUREFLAGS_LIT_STANDARD, always present
|
|
outGBuffer2.a = PackFloatInt8bit(coatMask, materialFeatureId, 8);
|
|
|
|
// RT3 - 11f:11f:10f
|
|
// In deferred we encode emissive color with bakeDiffuseLighting. We don't have the room to store emissiveColor.
|
|
// It mean that any futher process that affect bakeDiffuseLighting will also affect emissiveColor, like SSAO for example.
|
|
// Also if we don't have the room to store AO, then we apply it at this time on bakeDiffuseLighting which will cause a double occlusion with SSAO
|
|
#ifdef LIGHT_LAYERS
|
|
outGBuffer3 = float4(builtinData.bakeDiffuseLighting + builtinData.emissiveColor, 0.0);
|
|
// If we have light layers, take the opportunity to save AO and avoid double occlusion with SSAO
|
|
OUT_GBUFFER_LIGHT_LAYERS = float4(0.0, 0.0, surfaceData.ambientOcclusion, builtinData.renderingLayers / 255.0);
|
|
#else
|
|
outGBuffer3 = float4(builtinData.bakeDiffuseLighting * surfaceData.ambientOcclusion + builtinData.emissiveColor, 0.0);
|
|
#endif
|
|
|
|
#ifdef SHADOWS_SHADOWMASK
|
|
OUT_GBUFFER_SHADOWMASK = BUILTIN_DATA_SHADOW_MASK;
|
|
#endif
|
|
}
|
|
|
|
// Fills the BSDFData. Also returns the (per-pixel) material feature flags inferred
|
|
// from the contents of the G-buffer, which can be used by the feature classification system.
|
|
// Note that return type is not part of the MACRO DECODE_FROM_GBUFFER, so it is safe to use return value for our need
|
|
// 'tileFeatureFlags' are compile-time flags provided by the feature classification system.
|
|
// If you're not using the feature classification system, pass UINT_MAX.
|
|
// Also, see comment in TileVariantToFeatureFlags. When we are the worse case (i.e last variant), we read the featureflags
|
|
// from the structured buffer use to generate the indirect draw call. It allow to not go through all branch and the branch is scalar (not VGPR)
|
|
uint DecodeFromGBuffer(uint2 positionSS, uint tileFeatureFlags, out BSDFData bsdfData, out BuiltinData builtinData)
|
|
{
|
|
// Note: we have ZERO_INITIALIZE the struct, so bsdfData.diffusionProfile == DIFFUSION_PROFILE_NEUTRAL_ID,
|
|
// bsdfData.anisotropy == 0, bsdfData.subsurfaceMask == 0, etc...
|
|
ZERO_INITIALIZE(BSDFData, bsdfData);
|
|
// Note: Some properties of builtinData are not used, just init all at 0 to silent the compiler
|
|
ZERO_INITIALIZE(BuiltinData, builtinData);
|
|
|
|
// Isolate material features.
|
|
tileFeatureFlags &= MATERIAL_FEATURE_MASK_FLAGS;
|
|
|
|
GBufferType0 inGBuffer0 = LOAD_TEXTURE2D(_GBufferTexture0, positionSS);
|
|
GBufferType1 inGBuffer1 = LOAD_TEXTURE2D(_GBufferTexture1, positionSS);
|
|
GBufferType2 inGBuffer2 = LOAD_TEXTURE2D(_GBufferTexture2, positionSS);
|
|
|
|
// BuiltinData
|
|
builtinData.bakeDiffuseLighting = LOAD_TEXTURE2D(_GBufferTexture3, positionSS).rgb; // This also contain emissive (and * AO if no lightlayers)
|
|
|
|
// Avoid to introduce a new variant for light layer as it is already long to compile
|
|
if (_EnableLightLayers)
|
|
{
|
|
float4 inGBuffer4 = LOAD_TEXTURE2D(_LightLayersTexture, positionSS);
|
|
// If we have light layers, take the opportunity to save AO and avoid double occlusion with SSAO
|
|
bsdfData.ambientOcclusion = inGBuffer4.z;
|
|
builtinData.renderingLayers = uint(inGBuffer4.w * 255.5);
|
|
}
|
|
else
|
|
{
|
|
bsdfData.ambientOcclusion = 1.0; // No value available, just settings 1.0. This mean double occlusion with SSAO.
|
|
builtinData.renderingLayers = DEFAULT_LIGHT_LAYERS;
|
|
}
|
|
|
|
// We know the GBufferType no need to use abstraction
|
|
#ifdef SHADOWS_SHADOWMASK
|
|
float4 shadowMaskGbuffer = LOAD_TEXTURE2D(_ShadowMaskTexture, positionSS);
|
|
builtinData.shadowMask0 = shadowMaskGbuffer.x;
|
|
builtinData.shadowMask1 = shadowMaskGbuffer.y;
|
|
builtinData.shadowMask2 = shadowMaskGbuffer.z;
|
|
builtinData.shadowMask3 = shadowMaskGbuffer.w;
|
|
#else
|
|
builtinData.shadowMask0 = 1.0;
|
|
builtinData.shadowMask1 = 1.0;
|
|
builtinData.shadowMask2 = 1.0;
|
|
builtinData.shadowMask3 = 1.0;
|
|
#endif
|
|
|
|
// SurfaceData
|
|
|
|
// Material classification only uses the G-Buffer 2.
|
|
float coatMask;
|
|
uint materialFeatureId;
|
|
UnpackFloatInt8bit(inGBuffer2.a, 8, coatMask, materialFeatureId);
|
|
|
|
uint pixelFeatureFlags = MATERIALFEATUREFLAGS_LIT_STANDARD; // Only sky/background do not have the Standard flag.
|
|
bool pixelHasSubsurface = materialFeatureId == GBUFFER_LIT_TRANSMISSION_SSS || materialFeatureId == GBUFFER_LIT_SSS;
|
|
bool pixelHasTransmission = materialFeatureId == GBUFFER_LIT_TRANSMISSION_SSS || materialFeatureId == GBUFFER_LIT_TRANSMISSION;
|
|
bool pixelHasAnisotropy = materialFeatureId == GBUFFER_LIT_ANISOTROPIC;
|
|
bool pixelHasIridescence = materialFeatureId == GBUFFER_LIT_IRIDESCENCE;
|
|
bool pixelHasClearCoat = coatMask > 0.0;
|
|
|
|
// Disable pixel features disabled by the tile.
|
|
pixelFeatureFlags |= tileFeatureFlags & (pixelHasSubsurface ? MATERIALFEATUREFLAGS_LIT_SUBSURFACE_SCATTERING : 0);
|
|
pixelFeatureFlags |= tileFeatureFlags & (pixelHasTransmission ? MATERIALFEATUREFLAGS_LIT_TRANSMISSION : 0);
|
|
pixelFeatureFlags |= tileFeatureFlags & (pixelHasAnisotropy ? MATERIALFEATUREFLAGS_LIT_ANISOTROPY : 0);
|
|
pixelFeatureFlags |= tileFeatureFlags & (pixelHasIridescence ? MATERIALFEATUREFLAGS_LIT_IRIDESCENCE : 0);
|
|
pixelFeatureFlags |= tileFeatureFlags & (pixelHasClearCoat ? MATERIALFEATUREFLAGS_LIT_CLEAR_COAT : 0);
|
|
|
|
// In the case of material classification we assign tileFeatureFlags to bsdfData.materialFeatures
|
|
// This mean that the branch inside the tile will be the same (coherency). Remember that a divergent branch
|
|
// on AMD GCN mean we will execute both branch for all fragement. We setup at pixel level values
|
|
// such that a particular branch will not have effect if it shouldn't. For example if SSS is enabled,
|
|
// setup a sssMask of 0 don't have any effect and we can safely take the SSS branch for the tile.
|
|
// Note that in the catch all variant of material classification we get the value from the structure buffer done
|
|
// 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.
|
|
|
|
// tileFeatureFlags == MATERIAL_FEATURE_MASK_FLAGS can appear in following situation
|
|
// call from deferred.shader or other shader that doesn't peform material classification
|
|
// call from last catch all variant in material classification, which mean we have all possible material inside a same tile (very rare)
|
|
// call from a specific case in material classification (currently we have variant 0)
|
|
// When this happen, we prefer to use the pixelFeatureFlags rather than the tileFeatureFlags as bsdfData.materialFeatures
|
|
// because there is more likelihood to save performance (excep in the very rare case of catch all of material classification).
|
|
// We can indeed have divergence inside a tile (like having aniso and not aniso)
|
|
// but it is more likely that the whole time is convergent (like everything have SSS and clear coat).
|
|
if (tileFeatureFlags == MATERIAL_FEATURE_MASK_FLAGS)
|
|
{
|
|
bsdfData.materialFeatures = pixelFeatureFlags;
|
|
tileFeatureFlags = pixelFeatureFlags; // Required for the aniso test (see below)
|
|
}
|
|
else
|
|
{
|
|
bsdfData.materialFeatures = tileFeatureFlags;
|
|
}
|
|
|
|
// Decompress feature-agnostic data from the G-Buffer.
|
|
float3 baseColor = inGBuffer0.rgb;
|
|
|
|
NormalData normalData;
|
|
DecodeFromNormalBuffer(inGBuffer1, positionSS, normalData);
|
|
bsdfData.normalWS = normalData.normalWS;
|
|
bsdfData.perceptualRoughness = normalData.perceptualRoughness;
|
|
|
|
// Decompress feature-specific data from the G-Buffer.
|
|
bool pixelHasMetallic = HasFlag(pixelFeatureFlags, MATERIALFEATUREFLAGS_LIT_ANISOTROPY | MATERIALFEATUREFLAGS_LIT_IRIDESCENCE);
|
|
|
|
if (pixelHasMetallic)
|
|
{
|
|
float metallic;
|
|
uint unused;
|
|
UnpackFloatInt8bit(inGBuffer2.b, 8, metallic, unused);
|
|
|
|
bsdfData.diffuseColor = ComputeDiffuseColor(baseColor, metallic);
|
|
bsdfData.fresnel0 = ComputeFresnel0(baseColor, metallic, DEFAULT_SPECULAR_VALUE);
|
|
}
|
|
else
|
|
{
|
|
bsdfData.diffuseColor = baseColor;
|
|
bsdfData.fresnel0 = FastSRGBToLinear(inGBuffer2.rgb); // Later possibly overwritten by SSS
|
|
}
|
|
|
|
if (HasFlag(pixelFeatureFlags, MATERIALFEATUREFLAGS_LIT_SUBSURFACE_SCATTERING | MATERIALFEATUREFLAGS_LIT_TRANSMISSION))
|
|
{
|
|
SSSData sssData;
|
|
|
|
// We don't need to do this call, see comment below
|
|
// DecodeFromSSSBuffer(inGBuffer0, positionSS, sssData);
|
|
|
|
// Overwrite the diffusion profile/subsurfaceMask extracted by DecodeFromSSSBuffer().
|
|
// We must do this so the compiler can optimize away the read from the G-Buffer 0 to the very end (in PostEvaluateBSDF)
|
|
// Note that we don't use sssData.subsurfaceMask here. But it is still assign so we can have the information in the
|
|
// material debug view + If we require it in the future.
|
|
UnpackFloatInt8bit(inGBuffer2.b, 16, sssData.subsurfaceMask, sssData.diffusionProfile);
|
|
|
|
// Reminder: when using SSS we exchange specular occlusion and subsurfaceMask/profileID
|
|
bsdfData.specularOcclusion = inGBuffer2.r;
|
|
|
|
// Note: both function assign profile and overwrite fresnel0 (both SSS and Transmission)
|
|
// in case one feature is enabled and not the other.
|
|
|
|
// The neutral value of subsurfaceMask is 0 (handled by ZERO_INITIALIZE).
|
|
if (HasFlag(pixelFeatureFlags, MATERIALFEATUREFLAGS_LIT_SUBSURFACE_SCATTERING))
|
|
{
|
|
FillMaterialSSS(sssData.diffusionProfile, sssData.subsurfaceMask, bsdfData);
|
|
}
|
|
|
|
// The neutral value of thickness and transmittance is 0 (handled by ZERO_INITIALIZE).
|
|
if (HasFlag(pixelFeatureFlags, MATERIALFEATUREFLAGS_LIT_TRANSMISSION))
|
|
{
|
|
FillMaterialTransmission(sssData.diffusionProfile, inGBuffer2.g, bsdfData);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
bsdfData.specularOcclusion = inGBuffer0.a;
|
|
}
|
|
|
|
// Special handling for anisotropy: When anisotropy is present in a tile, the whole tile will use anisotropy to avoid divergent evaluation of GGX that increase the cost
|
|
// Note that it mean that when we have the worse case, we always use Anisotropy and shader like deferred.shader are always the worst case (but only used for debugging)
|
|
if (HasFlag(tileFeatureFlags, MATERIALFEATUREFLAGS_LIT_ANISOTROPY))
|
|
{
|
|
float anisotropy = 0;
|
|
float3x3 frame = GetLocalFrame(bsdfData.normalWS);
|
|
|
|
if (HasFlag(pixelFeatureFlags, MATERIALFEATUREFLAGS_LIT_ANISOTROPY))
|
|
{
|
|
anisotropy = inGBuffer2.r * 2.0 - 1.0;
|
|
|
|
float unused;
|
|
uint tangentFlags;
|
|
UnpackFloatInt8bit(inGBuffer2.b, 8, unused, tangentFlags);
|
|
|
|
// Get the rotation angle of the actual tangent frame with respect to the default one.
|
|
uint quadrant = tangentFlags;
|
|
uint storeSin = tangentFlags & 4;
|
|
float sinOrCos = inGBuffer2.g * rsqrt(2);
|
|
float cosOrSin = sqrt(1 - sinOrCos * sinOrCos);
|
|
float sinFrame = storeSin ? sinOrCos : cosOrSin;
|
|
float cosFrame = storeSin ? cosOrSin : sinOrCos;
|
|
sinFrame = (quadrant & 1) ? -sinFrame : sinFrame;
|
|
cosFrame = (quadrant & 2) ? -cosFrame : cosFrame;
|
|
|
|
// Rotate the reconstructed tangent around the normal.
|
|
frame[0] = sinFrame * frame[1] + cosFrame * frame[0];
|
|
frame[1] = cross(frame[2], frame[0]);
|
|
}
|
|
|
|
FillMaterialAnisotropy(anisotropy, frame[0], frame[1], bsdfData);
|
|
}
|
|
|
|
// The neutral value of iridescenceMask is 0 (handled by ZERO_INITIALIZE).
|
|
if (HasFlag(pixelFeatureFlags, MATERIALFEATUREFLAGS_LIT_IRIDESCENCE))
|
|
{
|
|
FillMaterialIridescence(inGBuffer2.r, inGBuffer2.g, bsdfData);
|
|
}
|
|
|
|
// The neutral value of coatMask is 0 (handled by ZERO_INITIALIZE).
|
|
if (HasFlag(pixelFeatureFlags, MATERIALFEATUREFLAGS_LIT_CLEAR_COAT))
|
|
{
|
|
// Modify perceptualRoughness
|
|
FillMaterialClearCoatData(coatMask, bsdfData);
|
|
}
|
|
|
|
// Note: the full code below (for both roughness) only execute when we have enableAnisotropy == true, otherwise as we only use roughnessT compiler will optimize out
|
|
// Mean that in the worst case we always execute it.
|
|
|
|
// roughnessT and roughnessB are clamped, and are meant to be used with punctual and directional lights.
|
|
// perceptualRoughness is not clamped, and is meant to be used for IBL.
|
|
// perceptualRoughness can be modify by FillMaterialClearCoatData, so ConvertAnisotropyToClampRoughness must be call after
|
|
ConvertAnisotropyToClampRoughness(bsdfData.perceptualRoughness, bsdfData.anisotropy, bsdfData.roughnessT, bsdfData.roughnessB);
|
|
|
|
ApplyDebugToBSDFData(bsdfData);
|
|
|
|
return pixelFeatureFlags;
|
|
}
|
|
|
|
// Function call from the material classification compute shader
|
|
uint MaterialFeatureFlagsFromGBuffer(uint2 positionSS)
|
|
{
|
|
BSDFData bsdfData;
|
|
BuiltinData unused;
|
|
// Call the regular function, compiler will optimized out everything not used.
|
|
// Note that all material feature flag bellow are in the same GBuffer (inGBuffer2) and thus material classification only sample one Gbuffer
|
|
return DecodeFromGBuffer(positionSS, UINT_MAX, bsdfData, unused);
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Debug method (use to display values)
|
|
//-----------------------------------------------------------------------------
|
|
|
|
void GetSurfaceDataDebug(uint paramId, SurfaceData surfaceData, inout float3 result, inout bool needLinearToSRGB)
|
|
{
|
|
GetGeneratedSurfaceDataDebug(paramId, surfaceData, result, needLinearToSRGB);
|
|
|
|
// Overide debug value output to be more readable
|
|
switch (paramId)
|
|
{
|
|
case DEBUGVIEW_LIT_SURFACEDATA_NORMAL_VIEW_SPACE:
|
|
// Convert to view space
|
|
result = TransformWorldToViewDir(surfaceData.normalWS) * 0.5 + 0.5;
|
|
break;
|
|
case DEBUGVIEW_LIT_SURFACEDATA_MATERIAL_FEATURES:
|
|
result = (surfaceData.materialFeatures.xxx) / 255.0; // Aloow to read with color picker debug mode
|
|
break;
|
|
case DEBUGVIEW_LIT_SURFACEDATA_INDEX_OF_REFRACTION:
|
|
result = saturate((surfaceData.ior - 1.0) / 1.5).xxx;
|
|
break;
|
|
}
|
|
}
|
|
|
|
void GetBSDFDataDebug(uint paramId, BSDFData bsdfData, inout float3 result, inout bool needLinearToSRGB)
|
|
{
|
|
GetGeneratedBSDFDataDebug(paramId, bsdfData, result, needLinearToSRGB);
|
|
|
|
// Overide debug value output to be more readable
|
|
switch (paramId)
|
|
{
|
|
case DEBUGVIEW_LIT_BSDFDATA_NORMAL_VIEW_SPACE:
|
|
// Convert to view space
|
|
result = TransformWorldToViewDir(bsdfData.normalWS) * 0.5 + 0.5;
|
|
break;
|
|
case DEBUGVIEW_LIT_BSDFDATA_MATERIAL_FEATURES:
|
|
result = (bsdfData.materialFeatures.xxx) / 255.0; // Aloow to read with color picker debug mode
|
|
break;
|
|
case DEBUGVIEW_LIT_BSDFDATA_IOR:
|
|
result = saturate((bsdfData.ior - 1.0) / 1.5).xxx;
|
|
break;
|
|
}
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// PreLightData
|
|
//-----------------------------------------------------------------------------
|
|
|
|
// Precomputed lighting data to send to the various lighting functions
|
|
struct PreLightData
|
|
{
|
|
float NdotV; // Could be negative due to normal mapping, use ClampNdotV()
|
|
|
|
// GGX
|
|
float partLambdaV;
|
|
float energyCompensation;
|
|
|
|
// IBL
|
|
float3 iblR; // Reflected specular direction, used for IBL in EvaluateBSDF_Env()
|
|
float iblPerceptualRoughness;
|
|
|
|
float3 specularFGD; // Store preintegrated BSDF for both specular and diffuse
|
|
float diffuseFGD;
|
|
|
|
// Area lights (17 VGPRs)
|
|
// TODO: 'orthoBasisViewNormal' is just a rotation around the normal and should thus be just 1x VGPR.
|
|
float3x3 orthoBasisViewNormal; // Right-handed view-dependent orthogonal basis around the normal (6x VGPRs)
|
|
float3x3 ltcTransformDiffuse; // Inverse transformation for Lambertian or Disney Diffuse (4x VGPRs)
|
|
float3x3 ltcTransformSpecular; // Inverse transformation for GGX (4x VGPRs)
|
|
|
|
// Clear coat
|
|
float coatPartLambdaV;
|
|
float3 coatIblR;
|
|
float coatIblF; // Fresnel term for view vector
|
|
float3x3 ltcTransformCoat; // Inverse transformation for GGX (4x VGPRs)
|
|
|
|
#if HAS_REFRACTION
|
|
// Refraction
|
|
float3 transparentRefractV; // refracted view vector after exiting the shape
|
|
float3 transparentPositionWS; // start of the refracted ray after exiting the shape
|
|
float3 transparentTransmittance; // transmittance due to absorption
|
|
float transparentSSMipLevel; // mip level of the screen space gaussian pyramid for rough refraction
|
|
#endif
|
|
};
|
|
|
|
PreLightData GetPreLightData(float3 V, PositionInputs posInput, inout BSDFData bsdfData)
|
|
{
|
|
PreLightData preLightData;
|
|
// Don't init to zero to allow to track warning about uninitialized data
|
|
|
|
float3 N = bsdfData.normalWS;
|
|
preLightData.NdotV = dot(N, V);
|
|
preLightData.iblPerceptualRoughness = bsdfData.perceptualRoughness;
|
|
|
|
float NdotV = ClampNdotV(preLightData.NdotV);
|
|
|
|
// We modify the bsdfData.fresnel0 here for iridescence
|
|
if (HasFlag(bsdfData.materialFeatures, MATERIALFEATUREFLAGS_LIT_IRIDESCENCE))
|
|
{
|
|
float viewAngle = NdotV;
|
|
float topIor = 1.0; // Default is air
|
|
if (HasFlag(bsdfData.materialFeatures, MATERIALFEATUREFLAGS_LIT_CLEAR_COAT))
|
|
{
|
|
topIor = lerp(1.0, CLEAR_COAT_IOR, bsdfData.coatMask);
|
|
// HACK: Use the reflected direction to specify the Fresnel coefficient for pre-convolved envmaps
|
|
viewAngle = sqrt(1.0 + Sq(1.0 / topIor) * (Sq(dot(bsdfData.normalWS, V)) - 1.0));
|
|
}
|
|
|
|
if (bsdfData.iridescenceMask > 0.0)
|
|
{
|
|
bsdfData.fresnel0 = lerp(bsdfData.fresnel0, EvalIridescence(topIor, viewAngle, bsdfData.iridescenceThickness, bsdfData.fresnel0), bsdfData.iridescenceMask);
|
|
}
|
|
}
|
|
|
|
// We modify the bsdfData.fresnel0 here for clearCoat
|
|
if (HasFlag(bsdfData.materialFeatures, MATERIALFEATUREFLAGS_LIT_CLEAR_COAT))
|
|
{
|
|
// Fresnel0 is deduced from interface between air and material (Assume to be 1.5 in Unity, or a metal).
|
|
// but here we go from clear coat (1.5) to material, we need to update fresnel0
|
|
// Note: Schlick is a poor approximation of Fresnel when ieta is 1 (1.5 / 1.5), schlick target 1.4 to 2.2 IOR.
|
|
bsdfData.fresnel0 = lerp(bsdfData.fresnel0, ConvertF0ForAirInterfaceToF0ForClearCoat15(bsdfData.fresnel0), bsdfData.coatMask);
|
|
|
|
preLightData.coatPartLambdaV = GetSmithJointGGXPartLambdaV(NdotV, CLEAR_COAT_ROUGHNESS);
|
|
preLightData.coatIblR = reflect(-V, N);
|
|
preLightData.coatIblF = F_Schlick(CLEAR_COAT_F0, NdotV) * bsdfData.coatMask;
|
|
}
|
|
|
|
// Handle IBL + area light + multiscattering.
|
|
// Note: use the not modified by anisotropy iblPerceptualRoughness here.
|
|
float specularReflectivity;
|
|
GetPreIntegratedFGDGGXAndDisneyDiffuse(NdotV, preLightData.iblPerceptualRoughness, bsdfData.fresnel0, preLightData.specularFGD, preLightData.diffuseFGD, specularReflectivity);
|
|
#ifdef USE_DIFFUSE_LAMBERT_BRDF
|
|
preLightData.diffuseFGD = 1.0;
|
|
#endif
|
|
|
|
#ifdef LIT_USE_GGX_ENERGY_COMPENSATION
|
|
// Ref: Practical multiple scattering compensation for microfacet models.
|
|
// We only apply the formulation for metals.
|
|
// For dielectrics, the change of reflectance is negligible.
|
|
// We deem the intensity difference of a couple of percent for high values of roughness
|
|
// to not be worth the cost of another precomputed table.
|
|
// Note: this formulation bakes the BSDF non-symmetric!
|
|
preLightData.energyCompensation = 1.0 / specularReflectivity - 1.0;
|
|
#else
|
|
preLightData.energyCompensation = 0.0;
|
|
#endif // LIT_USE_GGX_ENERGY_COMPENSATION
|
|
|
|
float3 iblN;
|
|
|
|
// We avoid divergent evaluation of the GGX, as that nearly doubles the cost.
|
|
// If the tile has anisotropy, all the pixels within the tile are evaluated as anisotropic.
|
|
if (HasFlag(bsdfData.materialFeatures, MATERIALFEATUREFLAGS_LIT_ANISOTROPY))
|
|
{
|
|
float TdotV = dot(bsdfData.tangentWS, V);
|
|
float BdotV = dot(bsdfData.bitangentWS, V);
|
|
|
|
preLightData.partLambdaV = GetSmithJointGGXAnisoPartLambdaV(TdotV, BdotV, NdotV, bsdfData.roughnessT, bsdfData.roughnessB);
|
|
|
|
// perceptualRoughness is use as input and output here
|
|
GetGGXAnisotropicModifiedNormalAndRoughness(bsdfData.bitangentWS, bsdfData.tangentWS, N, V, bsdfData.anisotropy, preLightData.iblPerceptualRoughness, iblN, preLightData.iblPerceptualRoughness);
|
|
}
|
|
else
|
|
{
|
|
preLightData.partLambdaV = GetSmithJointGGXPartLambdaV(NdotV, bsdfData.roughnessT);
|
|
iblN = N;
|
|
}
|
|
|
|
preLightData.iblR = reflect(-V, iblN);
|
|
|
|
// Area light
|
|
// UVs for sampling the LUTs
|
|
float theta = FastACosPos(NdotV); // For Area light - UVs for sampling the LUTs
|
|
float2 uv = LTC_LUT_OFFSET + LTC_LUT_SCALE * float2(bsdfData.perceptualRoughness, theta * INV_HALF_PI);
|
|
|
|
// Note we load the matrix transpose (avoid to have to transpose it in shader)
|
|
#ifdef USE_DIFFUSE_LAMBERT_BRDF
|
|
preLightData.ltcTransformDiffuse = k_identity3x3;
|
|
#else
|
|
// Get the inverse LTC matrix for Disney Diffuse
|
|
preLightData.ltcTransformDiffuse = 0.0;
|
|
preLightData.ltcTransformDiffuse._m22 = 1.0;
|
|
preLightData.ltcTransformDiffuse._m00_m02_m11_m20 = SAMPLE_TEXTURE2D_ARRAY_LOD(_LtcData, s_linear_clamp_sampler, uv, LTC_DISNEY_DIFFUSE_MATRIX_INDEX, 0);
|
|
#endif
|
|
|
|
// Get the inverse LTC matrix for GGX
|
|
// Note we load the matrix transpose (avoid to have to transpose it in shader)
|
|
preLightData.ltcTransformSpecular = 0.0;
|
|
preLightData.ltcTransformSpecular._m22 = 1.0;
|
|
preLightData.ltcTransformSpecular._m00_m02_m11_m20 = SAMPLE_TEXTURE2D_ARRAY_LOD(_LtcData, s_linear_clamp_sampler, uv, LTC_GGX_MATRIX_INDEX, 0);
|
|
|
|
// Construct a right-handed view-dependent orthogonal basis around the normal
|
|
preLightData.orthoBasisViewNormal[0] = normalize(V - N * preLightData.NdotV); // Do not clamp NdotV here
|
|
preLightData.orthoBasisViewNormal[2] = N;
|
|
preLightData.orthoBasisViewNormal[1] = cross(preLightData.orthoBasisViewNormal[2], preLightData.orthoBasisViewNormal[0]);
|
|
|
|
preLightData.ltcTransformCoat = 0.0;
|
|
if (HasFlag(bsdfData.materialFeatures, MATERIALFEATUREFLAGS_LIT_CLEAR_COAT))
|
|
{
|
|
float2 uv = LTC_LUT_OFFSET + LTC_LUT_SCALE * float2(CLEAR_COAT_PERCEPTUAL_ROUGHNESS, theta * INV_HALF_PI);
|
|
|
|
// Get the inverse LTC matrix for GGX
|
|
// Note we load the matrix transpose (avoid to have to transpose it in shader)
|
|
preLightData.ltcTransformCoat._m22 = 1.0;
|
|
preLightData.ltcTransformCoat._m00_m02_m11_m20 = SAMPLE_TEXTURE2D_ARRAY_LOD(_LtcData, s_linear_clamp_sampler, uv, LTC_GGX_MATRIX_INDEX, 0);
|
|
}
|
|
|
|
// refraction (forward only)
|
|
#if HAS_REFRACTION
|
|
RefractionModelResult refraction = REFRACTION_MODEL(V, posInput, bsdfData);
|
|
preLightData.transparentRefractV = refraction.rayWS;
|
|
preLightData.transparentPositionWS = refraction.positionWS;
|
|
preLightData.transparentTransmittance = exp(-bsdfData.absorptionCoefficient * refraction.dist);
|
|
// Empirical remap to try to match a bit the refraction probe blurring for the fallback
|
|
// Use IblPerceptualRoughness so we can handle approx of clear coat.
|
|
preLightData.transparentSSMipLevel = PositivePow(preLightData.iblPerceptualRoughness, 1.3) * uint(max(_ColorPyramidScale.z - 1, 0));
|
|
#endif
|
|
|
|
return preLightData;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// bake lighting function
|
|
//-----------------------------------------------------------------------------
|
|
|
|
// This define allow to say that we implement a ModifyBakedDiffuseLighting function to be call in PostInitBuiltinData
|
|
#define MODIFY_BAKED_DIFFUSE_LIGHTING
|
|
|
|
// This function allow to modify the content of (back) baked diffuse lighting when we gather builtinData
|
|
// This is use to apply lighting model specific code, like pre-integration, transmission etc...
|
|
// It is up to the lighting model implementer to chose if the modification are apply here or in PostEvaluateBSDF
|
|
void ModifyBakedDiffuseLighting(float3 V, PositionInputs posInput, SurfaceData surfaceData, inout BuiltinData builtinData)
|
|
{
|
|
// In case of deferred, all lighting model operation are done before storage in GBuffer, as we store emissive with bakeDiffuseLighting
|
|
|
|
// To get the data we need to do the whole process - compiler should optimize everything
|
|
BSDFData bsdfData = ConvertSurfaceDataToBSDFData(posInput.positionSS, surfaceData);
|
|
PreLightData preLightData = GetPreLightData(V, posInput, bsdfData);
|
|
|
|
// Add GI transmission contribution to bakeDiffuseLighting, we then drop backBakeDiffuseLighting (i.e it is not used anymore, this save VGPR in forward and in deferred we can't store it anyway)
|
|
if (HasFlag(bsdfData.materialFeatures, MATERIALFEATUREFLAGS_LIT_TRANSMISSION))
|
|
{
|
|
builtinData.bakeDiffuseLighting += builtinData.backBakeDiffuseLighting * bsdfData.transmittance;
|
|
}
|
|
|
|
// For SSS we need to take into account the state of diffuseColor
|
|
if (HasFlag(bsdfData.materialFeatures, MATERIALFEATUREFLAGS_LIT_SUBSURFACE_SCATTERING))
|
|
{
|
|
bsdfData.diffuseColor = GetModifiedDiffuseColorForSSS(bsdfData);
|
|
}
|
|
|
|
// Premultiply (back) bake diffuse lighting information with DisneyDiffuse pre-integration
|
|
builtinData.bakeDiffuseLighting *= preLightData.diffuseFGD * bsdfData.diffuseColor;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// light transport functions
|
|
//-----------------------------------------------------------------------------
|
|
|
|
LightTransportData GetLightTransportData(SurfaceData surfaceData, BuiltinData builtinData, BSDFData bsdfData)
|
|
{
|
|
LightTransportData lightTransportData;
|
|
|
|
// diffuseColor for lightmapping should basically be diffuse color.
|
|
// But rough metals (black diffuse) still scatter quite a lot of light around, so
|
|
// we want to take some of that into account too.
|
|
|
|
float roughness = PerceptualRoughnessToRoughness(bsdfData.perceptualRoughness);
|
|
lightTransportData.diffuseColor = bsdfData.diffuseColor + bsdfData.fresnel0 * roughness * 0.5 * surfaceData.metallic;
|
|
lightTransportData.emissiveColor = builtinData.emissiveColor;
|
|
|
|
return lightTransportData;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// LightLoop related function (Only include if required)
|
|
// HAS_LIGHTLOOP is define in Lighting.hlsl
|
|
//-----------------------------------------------------------------------------
|
|
|
|
#ifdef HAS_LIGHTLOOP
|
|
|
|
#ifndef _SURFACE_TYPE_TRANSPARENT
|
|
// For /Lighting/LightEvaluation.hlsl:
|
|
#define USE_DEFERRED_DIRECTIONAL_SHADOWS // Deferred shadows are always enabled for opaque objects
|
|
#endif
|
|
|
|
#include "HDRP/Material/MaterialEvaluation.hlsl"
|
|
#include "HDRP/Lighting/LightEvaluation.hlsl"
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// BSDF share between directional light, punctual light and area light (reference)
|
|
//-----------------------------------------------------------------------------
|
|
|
|
// This function apply BSDF. Assumes that NdotL is positive.
|
|
void BSDF( float3 V, float3 L, float NdotL, float3 positionWS, PreLightData preLightData, BSDFData bsdfData,
|
|
out float3 diffuseLighting,
|
|
out float3 specularLighting)
|
|
{
|
|
float LdotV, NdotH, LdotH, NdotV, invLenLV;
|
|
GetBSDFAngle(V, L, NdotL, preLightData.NdotV, LdotV, NdotH, LdotH, NdotV, invLenLV);
|
|
|
|
float3 F = F_Schlick(bsdfData.fresnel0, LdotH);
|
|
// Remark: Fresnel must be use with LdotH angle. But Fresnel for iridescence is expensive to compute at each light.
|
|
// Instead we use the incorrect angle NdotV as an approximation for LdotH for Fresnel evaluation.
|
|
// The Fresnel with iridescence and NDotV angle is precomputed ahead and here we jsut reuse the result.
|
|
// Thus why we shouldn't apply a second time Fresnel on the value if iridescence is enabled.
|
|
if (HasFlag(bsdfData.materialFeatures, MATERIALFEATUREFLAGS_LIT_IRIDESCENCE))
|
|
{
|
|
F = lerp(F, bsdfData.fresnel0, bsdfData.iridescenceMask);
|
|
}
|
|
|
|
float DV;
|
|
if (HasFlag(bsdfData.materialFeatures, MATERIALFEATUREFLAGS_LIT_ANISOTROPY))
|
|
{
|
|
float3 H = (L + V) * invLenLV;
|
|
|
|
// For anisotropy we must not saturate these values
|
|
float TdotH = dot(bsdfData.tangentWS, H);
|
|
float TdotL = dot(bsdfData.tangentWS, L);
|
|
float BdotH = dot(bsdfData.bitangentWS, H);
|
|
float BdotL = dot(bsdfData.bitangentWS, L);
|
|
|
|
// TODO: Do comparison between this correct version and the one from isotropic and see if there is any visual difference
|
|
DV = DV_SmithJointGGXAniso(TdotH, BdotH, NdotH, NdotV, TdotL, BdotL, NdotL,
|
|
bsdfData.roughnessT, bsdfData.roughnessB, preLightData.partLambdaV);
|
|
}
|
|
else
|
|
{
|
|
DV = DV_SmithJointGGX(NdotH, NdotL, NdotV, bsdfData.roughnessT, preLightData.partLambdaV);
|
|
}
|
|
specularLighting = F * DV;
|
|
|
|
#ifdef USE_DIFFUSE_LAMBERT_BRDF
|
|
float diffuseTerm = Lambert();
|
|
#else
|
|
// A note on subsurface scattering: [SSS-NOTE-TRSM]
|
|
// The correct way to handle SSS is to transmit light inside the surface, perform SSS,
|
|
// and then transmit it outside towards the viewer.
|
|
// Transmit(X) = F_Transm_Schlick(F0, F90, NdotX), where F0 = 0, F90 = 1.
|
|
// Therefore, the diffuse BSDF should be decomposed as follows:
|
|
// f_d = A / Pi * F_Transm_Schlick(0, 1, NdotL) * F_Transm_Schlick(0, 1, NdotV) + f_d_reflection,
|
|
// with F_Transm_Schlick(0, 1, NdotV) applied after the SSS pass.
|
|
// The alternative (artistic) formulation of Disney is to set F90 = 0.5:
|
|
// f_d = A / Pi * F_Transm_Schlick(0, 0.5, NdotL) * F_Transm_Schlick(0, 0.5, NdotV) + f_retro_reflection.
|
|
// That way, darkening at grading angles is reduced to 0.5.
|
|
// In practice, applying F_Transm_Schlick(F0, F90, NdotV) after the SSS pass is expensive,
|
|
// as it forces us to read the normal buffer at the end of the SSS pass.
|
|
// Separating f_retro_reflection also has a small cost (mostly due to energy compensation
|
|
// for multi-bounce GGX), and the visual difference is negligible.
|
|
// Therefore, we choose not to separate diffuse lighting into reflected and transmitted.
|
|
float diffuseTerm = DisneyDiffuse(NdotV, NdotL, LdotV, bsdfData.perceptualRoughness);
|
|
#endif
|
|
|
|
// We don't multiply by 'bsdfData.diffuseColor' here. It's done only once in PostEvaluateBSDF().
|
|
diffuseLighting = diffuseTerm;
|
|
|
|
if (HasFlag(bsdfData.materialFeatures, MATERIALFEATUREFLAGS_LIT_CLEAR_COAT))
|
|
{
|
|
// Apply isotropic GGX for clear coat
|
|
// Note: coat F is scalar as it is a dieletric
|
|
float coatF = F_Schlick(CLEAR_COAT_F0, LdotH) * bsdfData.coatMask;
|
|
// Scale base specular
|
|
specularLighting *= Sq(1.0 - coatF);
|
|
|
|
// Add top specular
|
|
// TODO: Should we call just D_GGX here ?
|
|
float DV = DV_SmithJointGGX(NdotH, NdotL, NdotV, bsdfData.coatRoughness, preLightData.coatPartLambdaV);
|
|
specularLighting += coatF * DV;
|
|
|
|
// Note: The modification of the base roughness and fresnel0 by the clear coat is already handled in FillMaterialClearCoatData
|
|
|
|
// Very coarse attempt at doing energy conservation for the diffuse layer based on NdotL. No science.
|
|
diffuseLighting *= lerp(1, 1.0 - coatF, bsdfData.coatMask);
|
|
}
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// EvaluateBSDF_Directional
|
|
//-----------------------------------------------------------------------------
|
|
|
|
DirectLighting EvaluateBSDF_Directional(LightLoopContext lightLoopContext,
|
|
float3 V, PositionInputs posInput, PreLightData preLightData,
|
|
DirectionalLightData lightData, BSDFData bsdfData,
|
|
BuiltinData builtinData)
|
|
{
|
|
DirectLighting lighting;
|
|
ZERO_INITIALIZE(DirectLighting, lighting);
|
|
|
|
float3 L = -lightData.forward;
|
|
float3 N = bsdfData.normalWS;
|
|
float NdotL = dot(N, L);
|
|
|
|
float3 transmittance = float3(0.0, 0.0, 0.0);
|
|
if (HasFlag(bsdfData.materialFeatures, MATERIAL_FEATURE_FLAGS_TRANSMISSION_MODE_THIN_THICKNESS))
|
|
{
|
|
// Caution: This function modify N and contactShadowIndex
|
|
transmittance = PreEvaluateDirectionalLightTransmission(NdotL, lightData, bsdfData, N, lightData.contactShadowIndex); // contactShadowIndex is only modify for the code of this function
|
|
}
|
|
|
|
float3 color;
|
|
float attenuation;
|
|
EvaluateLight_Directional(lightLoopContext, posInput, lightData, builtinData, N, L, color, attenuation);
|
|
|
|
float intensity = max(0, attenuation * NdotL); // Warning: attenuation can be greater than 1 due to the inverse square attenuation (when position is close to light)
|
|
|
|
// Note: We use NdotL here to early out, but in case of clear coat this is not correct. But we are ok with this
|
|
UNITY_BRANCH if (intensity > 0.0)
|
|
{
|
|
BSDF(V, L, NdotL, posInput.positionWS, preLightData, bsdfData, lighting.diffuse, lighting.specular);
|
|
|
|
lighting.diffuse *= intensity * lightData.diffuseScale;
|
|
lighting.specular *= intensity * lightData.specularScale;
|
|
}
|
|
|
|
// The mixed thickness mode is not supported by directional lights due to poor quality and high performance impact.
|
|
if (HasFlag(bsdfData.materialFeatures, MATERIAL_FEATURE_FLAGS_TRANSMISSION_MODE_THIN_THICKNESS))
|
|
{
|
|
float NdotV = ClampNdotV(preLightData.NdotV);
|
|
float LdotV = dot(L, V);
|
|
// We use diffuse lighting for accumulation since it is going to be blurred during the SSS pass.
|
|
lighting.diffuse += EvaluateTransmission(bsdfData, transmittance, NdotL, NdotV, LdotV, attenuation * lightData.diffuseScale);
|
|
}
|
|
|
|
// Save ALU by applying light and cookie colors only once.
|
|
lighting.diffuse *= color;
|
|
lighting.specular *= color;
|
|
|
|
#ifdef DEBUG_DISPLAY
|
|
if (_DebugLightingMode == DEBUGLIGHTINGMODE_LUX_METER)
|
|
{
|
|
// Only lighting, not BSDF
|
|
lighting.diffuse = color * intensity * lightData.diffuseScale;
|
|
}
|
|
#endif
|
|
|
|
return lighting;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// EvaluateBSDF_Punctual (supports spot, point and projector lights)
|
|
//-----------------------------------------------------------------------------
|
|
|
|
DirectLighting EvaluateBSDF_Punctual(LightLoopContext lightLoopContext,
|
|
float3 V, PositionInputs posInput,
|
|
PreLightData preLightData, LightData lightData, BSDFData bsdfData, BuiltinData builtinData)
|
|
{
|
|
DirectLighting lighting;
|
|
ZERO_INITIALIZE(DirectLighting, lighting);
|
|
|
|
float3 L;
|
|
float3 lightToSample;
|
|
float4 distances; // {d, d^2, 1/d, d_proj}
|
|
GetPunctualLightVectors(posInput.positionWS, lightData, L, lightToSample, distances);
|
|
|
|
float3 N = bsdfData.normalWS;
|
|
float NdotL = dot(N, L);
|
|
|
|
float3 transmittance = float3(0.0, 0.0, 0.0);
|
|
if (HasFlag(bsdfData.materialFeatures, MATERIALFEATUREFLAGS_LIT_TRANSMISSION))
|
|
{
|
|
// Caution: This function modify N and lightData.contactShadowIndex
|
|
transmittance = PreEvaluatePunctualLightTransmission(lightLoopContext, posInput, distances.x, NdotL, L, bsdfData, N, lightData);
|
|
}
|
|
|
|
float3 color;
|
|
float attenuation;
|
|
EvaluateLight_Punctual(lightLoopContext, posInput, lightData, builtinData, N, L,
|
|
lightToSample, distances, color, attenuation);
|
|
|
|
float intensity = max(0, attenuation * NdotL); // Warning: attenuation can be greater than 1 due to the inverse square attenuation (when position is close to light)
|
|
|
|
// Note: We use NdotL here to early out, but in case of clear coat this is not correct. But we are ok with this
|
|
UNITY_BRANCH if (intensity > 0.0)
|
|
{
|
|
// Simulate a sphere light with this hack
|
|
// Note that it is not correct with our pre-computation of PartLambdaV (mean if we disable the optimization we will not have the
|
|
// same result) but we don't care as it is a hack anyway
|
|
bsdfData.coatRoughness = max(bsdfData.coatRoughness, lightData.minRoughness);
|
|
bsdfData.roughnessT = max(bsdfData.roughnessT, lightData.minRoughness);
|
|
bsdfData.roughnessB = max(bsdfData.roughnessB, lightData.minRoughness);
|
|
|
|
BSDF(V, L, NdotL, posInput.positionWS, preLightData, bsdfData, lighting.diffuse, lighting.specular);
|
|
|
|
lighting.diffuse *= intensity * lightData.diffuseScale;
|
|
lighting.specular *= intensity * lightData.specularScale;
|
|
}
|
|
|
|
if (HasFlag(bsdfData.materialFeatures, MATERIALFEATUREFLAGS_LIT_TRANSMISSION))
|
|
{
|
|
float NdotV = ClampNdotV(preLightData.NdotV);
|
|
float LdotV = dot(L, V);
|
|
// We use diffuse lighting for accumulation since it is going to be blurred during the SSS pass.
|
|
lighting.diffuse += EvaluateTransmission(bsdfData, transmittance, NdotL, NdotV, LdotV, attenuation * lightData.diffuseScale);
|
|
}
|
|
|
|
// Save ALU by applying light and cookie colors only once.
|
|
lighting.diffuse *= color;
|
|
lighting.specular *= color;
|
|
|
|
#ifdef DEBUG_DISPLAY
|
|
if (_DebugLightingMode == DEBUGLIGHTINGMODE_LUX_METER)
|
|
{
|
|
// Only lighting, not BSDF
|
|
lighting.diffuse = color * intensity * lightData.diffuseScale;
|
|
}
|
|
#endif
|
|
|
|
return lighting;
|
|
}
|
|
|
|
#include "LitReference.hlsl"
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// EvaluateBSDF_Line - Approximation with Linearly Transformed Cosines
|
|
//-----------------------------------------------------------------------------
|
|
|
|
DirectLighting EvaluateBSDF_Line( LightLoopContext lightLoopContext,
|
|
float3 V, PositionInputs posInput,
|
|
PreLightData preLightData, LightData lightData, BSDFData bsdfData, BuiltinData builtinData)
|
|
{
|
|
DirectLighting lighting;
|
|
ZERO_INITIALIZE(DirectLighting, lighting);
|
|
|
|
float3 positionWS = posInput.positionWS;
|
|
|
|
#ifdef LIT_DISPLAY_REFERENCE_AREA
|
|
IntegrateBSDF_LineRef(V, positionWS, preLightData, lightData, bsdfData,
|
|
lighting.diffuse, lighting.specular);
|
|
#else
|
|
float len = lightData.size.x;
|
|
float3 T = lightData.right;
|
|
|
|
float3 unL = lightData.positionRWS - positionWS;
|
|
|
|
// Pick the major axis of the ellipsoid.
|
|
float3 axis = lightData.right;
|
|
|
|
// We define the ellipsoid s.t. r1 = (r + len / 2), r2 = r3 = r.
|
|
// TODO: This could be precomputed.
|
|
float radius = rsqrt(lightData.rangeAttenuationScale); // // rangeAttenuationScale is inverse Square Radius
|
|
float invAspectRatio = saturate(radius / (radius + (0.5 * len)));
|
|
|
|
// Compute the light attenuation.
|
|
float intensity = EllipsoidalDistanceAttenuation(unL, lightData.rangeAttenuationScale, lightData.rangeAttenuationBias,
|
|
axis, invAspectRatio);
|
|
|
|
// Terminate if the shaded point is too far away.
|
|
if (intensity == 0.0)
|
|
return lighting;
|
|
|
|
lightData.diffuseScale *= intensity;
|
|
lightData.specularScale *= intensity;
|
|
|
|
// Translate the light s.t. the shaded point is at the origin of the coordinate system.
|
|
lightData.positionRWS -= positionWS;
|
|
|
|
// TODO: some of this could be precomputed.
|
|
float3 P1 = lightData.positionRWS - T * (0.5 * len);
|
|
float3 P2 = lightData.positionRWS + T * (0.5 * len);
|
|
|
|
// Rotate the endpoints into the local coordinate system.
|
|
P1 = mul(P1, transpose(preLightData.orthoBasisViewNormal));
|
|
P2 = mul(P2, transpose(preLightData.orthoBasisViewNormal));
|
|
|
|
// Compute the binormal in the local coordinate system.
|
|
float3 B = normalize(cross(P1, P2));
|
|
|
|
float ltcValue;
|
|
|
|
// Evaluate the diffuse part
|
|
ltcValue = LTCEvaluate(P1, P2, B, preLightData.ltcTransformDiffuse);
|
|
ltcValue *= lightData.diffuseScale;
|
|
// We don't multiply by 'bsdfData.diffuseColor' here. It's done only once in PostEvaluateBSDF().
|
|
|
|
// See comment for specular magnitude, it apply to diffuse as well
|
|
lighting.diffuse = preLightData.diffuseFGD * ltcValue;
|
|
|
|
UNITY_BRANCH if (HasFlag(bsdfData.materialFeatures, MATERIALFEATUREFLAGS_LIT_TRANSMISSION))
|
|
{
|
|
// Flip the view vector and the normal. The bitangent stays the same.
|
|
float3x3 flipMatrix = float3x3(-1, 0, 0,
|
|
0, 1, 0,
|
|
0, 0, -1);
|
|
|
|
// Use the Lambertian approximation for performance reasons.
|
|
// The matrix multiplication should not generate any extra ALU on GCN.
|
|
// TODO: double evaluation is very inefficient! This is a temporary solution.
|
|
ltcValue = LTCEvaluate(P1, P2, B, mul(flipMatrix, k_identity3x3));
|
|
ltcValue *= lightData.diffuseScale;
|
|
// We use diffuse lighting for accumulation since it is going to be blurred during the SSS pass.
|
|
// We don't multiply by 'bsdfData.diffuseColor' here. It's done only once in PostEvaluateBSDF().
|
|
lighting.diffuse += bsdfData.transmittance * ltcValue;
|
|
}
|
|
|
|
// Evaluate the specular part
|
|
ltcValue = LTCEvaluate(P1, P2, B, preLightData.ltcTransformSpecular);
|
|
ltcValue *= lightData.specularScale;
|
|
// We need to multiply by the magnitude of the integral of the BRDF
|
|
// ref: http://advances.realtimerendering.com/s2016/s2016_ltc_fresnel.pdf
|
|
// This value is what we store in specularFGD, so reuse it
|
|
lighting.specular = preLightData.specularFGD * ltcValue;
|
|
|
|
// Evaluate the coat part
|
|
if (HasFlag(bsdfData.materialFeatures, MATERIALFEATUREFLAGS_LIT_CLEAR_COAT))
|
|
{
|
|
ltcValue = LTCEvaluate(P1, P2, B, preLightData.ltcTransformCoat);
|
|
ltcValue *= lightData.specularScale;
|
|
// For clear coat we don't fetch specularFGD we can use directly the perfect fresnel coatIblF
|
|
lighting.diffuse *= (1.0 - preLightData.coatIblF);
|
|
lighting.specular *= (1.0 - preLightData.coatIblF);
|
|
lighting.specular += preLightData.coatIblF * ltcValue;
|
|
}
|
|
|
|
// Save ALU by applying 'lightData.color' only once.
|
|
lighting.diffuse *= lightData.color;
|
|
lighting.specular *= lightData.color;
|
|
|
|
#ifdef DEBUG_DISPLAY
|
|
if (_DebugLightingMode == DEBUGLIGHTINGMODE_LUX_METER)
|
|
{
|
|
// Only lighting, not BSDF
|
|
// Apply area light on lambert then multiply by PI to cancel Lambert
|
|
lighting.diffuse = LTCEvaluate(P1, P2, B, k_identity3x3);
|
|
lighting.diffuse *= PI * lightData.diffuseScale;
|
|
}
|
|
#endif
|
|
|
|
#endif // LIT_DISPLAY_REFERENCE_AREA
|
|
|
|
return lighting;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// EvaluateBSDF_Rect - Approximation with Linearly Transformed Cosines
|
|
//-----------------------------------------------------------------------------
|
|
|
|
// #define ELLIPSOIDAL_ATTENUATION
|
|
|
|
DirectLighting EvaluateBSDF_Rect( LightLoopContext lightLoopContext,
|
|
float3 V, PositionInputs posInput,
|
|
PreLightData preLightData, LightData lightData, BSDFData bsdfData, BuiltinData builtinData)
|
|
{
|
|
DirectLighting lighting;
|
|
ZERO_INITIALIZE(DirectLighting, lighting);
|
|
|
|
float3 positionWS = posInput.positionWS;
|
|
|
|
#ifdef LIT_DISPLAY_REFERENCE_AREA
|
|
IntegrateBSDF_AreaRef(V, positionWS, preLightData, lightData, bsdfData,
|
|
lighting.diffuse, lighting.specular);
|
|
#else
|
|
float3 unL = lightData.positionRWS - positionWS;
|
|
|
|
if (dot(lightData.forward, unL) >= 0.0001)
|
|
{
|
|
// The light is back-facing.
|
|
return lighting;
|
|
}
|
|
|
|
// Rotate the light direction into the light space.
|
|
float3x3 lightToWorld = float3x3(lightData.right, lightData.up, -lightData.forward);
|
|
unL = mul(unL, transpose(lightToWorld));
|
|
|
|
// TODO: This could be precomputed.
|
|
float halfWidth = lightData.size.x * 0.5;
|
|
float halfHeight = lightData.size.y * 0.5;
|
|
|
|
// Define the dimensions of the attenuation volume.
|
|
// TODO: This could be precomputed.
|
|
float radius = rsqrt(lightData.rangeAttenuationScale); // rangeAttenuationScale is inverse Square Radius
|
|
float3 invHalfDim = rcp(float3(radius + halfWidth,
|
|
radius + halfHeight,
|
|
radius));
|
|
|
|
// Compute the light attenuation.
|
|
#ifdef ELLIPSOIDAL_ATTENUATION
|
|
// The attenuation volume is an axis-aligned ellipsoid s.t.
|
|
// r1 = (r + w / 2), r2 = (r + h / 2), r3 = r.
|
|
float intensity = EllipsoidalDistanceAttenuation(unL, invHalfDim);
|
|
#else
|
|
// The attenuation volume is an axis-aligned box s.t.
|
|
// hX = (r + w / 2), hY = (r + h / 2), hZ = r.
|
|
float intensity = BoxDistanceAttenuation(unL, invHalfDim);
|
|
#endif
|
|
|
|
// Terminate if the shaded point is too far away.
|
|
if (intensity == 0.0)
|
|
return lighting;
|
|
|
|
lightData.diffuseScale *= intensity;
|
|
lightData.specularScale *= intensity;
|
|
|
|
// Translate the light s.t. the shaded point is at the origin of the coordinate system.
|
|
lightData.positionRWS -= positionWS;
|
|
|
|
float4x3 lightVerts;
|
|
|
|
// TODO: some of this could be precomputed.
|
|
lightVerts[0] = lightData.positionRWS + lightData.right * halfWidth + lightData.up * halfHeight;
|
|
lightVerts[1] = lightData.positionRWS + lightData.right * halfWidth + lightData.up * -halfHeight;
|
|
lightVerts[2] = lightData.positionRWS + lightData.right * -halfWidth + lightData.up * -halfHeight;
|
|
lightVerts[3] = lightData.positionRWS + lightData.right * -halfWidth + lightData.up * halfHeight;
|
|
|
|
// Rotate the endpoints into the local coordinate system.
|
|
lightVerts = mul(lightVerts, transpose(preLightData.orthoBasisViewNormal));
|
|
|
|
float ltcValue;
|
|
|
|
// Evaluate the diffuse part
|
|
// Polygon irradiance in the transformed configuration.
|
|
ltcValue = PolygonIrradiance(mul(lightVerts, preLightData.ltcTransformDiffuse));
|
|
ltcValue *= lightData.diffuseScale;
|
|
// We don't multiply by 'bsdfData.diffuseColor' here. It's done only once in PostEvaluateBSDF().
|
|
// See comment for specular magnitude, it apply to diffuse as well
|
|
lighting.diffuse = preLightData.diffuseFGD * ltcValue;
|
|
|
|
UNITY_BRANCH if (HasFlag(bsdfData.materialFeatures, MATERIALFEATUREFLAGS_LIT_TRANSMISSION))
|
|
{
|
|
// Flip the view vector and the normal. The bitangent stays the same.
|
|
float3x3 flipMatrix = float3x3(-1, 0, 0,
|
|
0, 1, 0,
|
|
0, 0, -1);
|
|
|
|
// Use the Lambertian approximation for performance reasons.
|
|
// The matrix multiplication should not generate any extra ALU on GCN.
|
|
float3x3 ltcTransform = mul(flipMatrix, k_identity3x3);
|
|
|
|
// Polygon irradiance in the transformed configuration.
|
|
// TODO: double evaluation is very inefficient! This is a temporary solution.
|
|
ltcValue = PolygonIrradiance(mul(lightVerts, ltcTransform));
|
|
ltcValue *= lightData.diffuseScale;
|
|
// We use diffuse lighting for accumulation since it is going to be blurred during the SSS pass.
|
|
// We don't multiply by 'bsdfData.diffuseColor' here. It's done only once in PostEvaluateBSDF().
|
|
lighting.diffuse += bsdfData.transmittance * ltcValue;
|
|
}
|
|
|
|
// Evaluate the specular part
|
|
// Polygon irradiance in the transformed configuration.
|
|
ltcValue = PolygonIrradiance(mul(lightVerts, preLightData.ltcTransformSpecular));
|
|
ltcValue *= lightData.specularScale;
|
|
// We need to multiply by the magnitude of the integral of the BRDF
|
|
// ref: http://advances.realtimerendering.com/s2016/s2016_ltc_fresnel.pdf
|
|
// This value is what we store in specularFGD, so reuse it
|
|
lighting.specular += preLightData.specularFGD * ltcValue;
|
|
|
|
// Evaluate the coat part
|
|
if (HasFlag(bsdfData.materialFeatures, MATERIALFEATUREFLAGS_LIT_CLEAR_COAT))
|
|
{
|
|
ltcValue = PolygonIrradiance(mul(lightVerts, preLightData.ltcTransformCoat));
|
|
ltcValue *= lightData.specularScale;
|
|
// For clear coat we don't fetch specularFGD we can use directly the perfect fresnel coatIblF
|
|
lighting.diffuse *= (1.0 - preLightData.coatIblF);
|
|
lighting.specular *= (1.0 - preLightData.coatIblF);
|
|
lighting.specular += preLightData.coatIblF * ltcValue;
|
|
}
|
|
|
|
// Save ALU by applying 'lightData.color' only once.
|
|
lighting.diffuse *= lightData.color;
|
|
lighting.specular *= lightData.color;
|
|
|
|
#ifdef DEBUG_DISPLAY
|
|
if (_DebugLightingMode == DEBUGLIGHTINGMODE_LUX_METER)
|
|
{
|
|
// Only lighting, not BSDF
|
|
// Apply area light on lambert then multiply by PI to cancel Lambert
|
|
lighting.diffuse = PolygonIrradiance(mul(lightVerts, k_identity3x3));
|
|
lighting.diffuse *= PI * lightData.diffuseScale;
|
|
}
|
|
#endif
|
|
|
|
#endif // LIT_DISPLAY_REFERENCE_AREA
|
|
|
|
return lighting;
|
|
}
|
|
|
|
DirectLighting EvaluateBSDF_Area(LightLoopContext lightLoopContext,
|
|
float3 V, PositionInputs posInput,
|
|
PreLightData preLightData, LightData lightData,
|
|
BSDFData bsdfData, BuiltinData builtinData)
|
|
{
|
|
if (lightData.lightType == GPULIGHTTYPE_LINE)
|
|
{
|
|
return EvaluateBSDF_Line(lightLoopContext, V, posInput, preLightData, lightData, bsdfData, builtinData);
|
|
}
|
|
else
|
|
{
|
|
return EvaluateBSDF_Rect(lightLoopContext, V, posInput, preLightData, lightData, bsdfData, builtinData);
|
|
}
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// EvaluateBSDF_SSLighting for screen space lighting
|
|
// ----------------------------------------------------------------------------
|
|
|
|
IndirectLighting EvaluateBSDF_SSLighting(LightLoopContext lightLoopContext,
|
|
float3 V, PositionInputs posInput,
|
|
PreLightData preLightData, BSDFData bsdfData,
|
|
EnvLightData envLightData,
|
|
int GPUImageBasedLightingType,
|
|
inout float hierarchyWeight)
|
|
{
|
|
IndirectLighting lighting;
|
|
ZERO_INITIALIZE(IndirectLighting, lighting);
|
|
|
|
// -------------------------------
|
|
// Early out
|
|
// -------------------------------
|
|
#if !HAS_REFRACTION
|
|
if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFRACTION)
|
|
{
|
|
// No refraction, no need to go further
|
|
hierarchyWeight = 1.0;
|
|
return lighting;
|
|
}
|
|
#endif
|
|
|
|
// -------------------------------
|
|
// Choose projection model
|
|
// -------------------------------
|
|
int projectionModel = PROJECTIONMODEL_NONE;
|
|
#if HAS_REFRACTION
|
|
if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFRACTION)
|
|
{
|
|
#if defined(_REFRACTION_SSRAY_HIZ)
|
|
projectionModel = PROJECTIONMODEL_HI_Z;
|
|
#elif defined(_REFRACTION_SSRAY_PROXY)
|
|
projectionModel = PROJECTIONMODEL_PROXY;
|
|
#endif
|
|
}
|
|
#else
|
|
if (_SSReflectionEnabled != 0)
|
|
projectionModel = _SSReflectionProjectionModel;
|
|
#endif
|
|
|
|
if (projectionModel == PROJECTIONMODEL_NONE)
|
|
return lighting;
|
|
|
|
// -------------------------------
|
|
// Initialize screen space tracing
|
|
// -------------------------------
|
|
float3 rayOriginWS = float3(0, 0, 0);
|
|
float3 rayDirWS = float3(0, 0, 0);
|
|
float mipLevel = 0;
|
|
#ifdef DEBUG_DISPLAY
|
|
int debugMode = 0;
|
|
#endif
|
|
float invScreenWeightDistance = 0;
|
|
float temporalFilteringWeight = 0.1;
|
|
|
|
#if HAS_REFRACTION
|
|
if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFRACTION)
|
|
{
|
|
// Refraction process:
|
|
// 1. Depending on the shape model, we calculate the refracted point in world space and the optical depth
|
|
// 2. We calculate the screen space position of the refracted point
|
|
// 3. If this point is available (ie: in color buffer and point is not in front of the object)
|
|
// a. Get the corresponding color depending on the roughness from the gaussian pyramid of the color buffer
|
|
// b. Multiply by the transmittance for absorption (depends on the optical depth)
|
|
|
|
rayOriginWS = preLightData.transparentPositionWS;
|
|
rayDirWS = preLightData.transparentRefractV;
|
|
mipLevel = preLightData.transparentSSMipLevel;
|
|
invScreenWeightDistance = _SSRefractionInvScreenWeightDistance;
|
|
#ifdef DEBUG_DISPLAY
|
|
debugMode = DEBUGLIGHTINGMODE_SCREEN_SPACE_TRACING_REFRACTION;
|
|
#endif
|
|
}
|
|
else
|
|
#endif
|
|
if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFLECTION)
|
|
{
|
|
rayOriginWS = posInput.positionWS;
|
|
rayDirWS = preLightData.iblR;
|
|
mipLevel = PlanarPerceptualRoughnessToMipmapLevel(preLightData.iblPerceptualRoughness, _ColorPyramidScale.z);
|
|
invScreenWeightDistance = _SSReflectionInvScreenWeightDistance;
|
|
#ifdef DEBUG_DISPLAY
|
|
debugMode = DEBUGLIGHTINGMODE_SCREEN_SPACE_TRACING_REFLECTION;
|
|
#endif
|
|
}
|
|
|
|
#ifdef DEBUG_DISPLAY
|
|
bool debug = _DebugLightingMode == debugMode
|
|
&& !any(int2(_MouseClickPixelCoord.xy) - int2(posInput.positionSS));
|
|
#endif
|
|
|
|
// -------------------------------
|
|
// Screen space tracing query
|
|
// -------------------------------
|
|
ScreenSpaceRayHit hit;
|
|
ZERO_INITIALIZE(ScreenSpaceRayHit, hit);
|
|
bool hitSuccessful = false;
|
|
float hitWeight = 1;
|
|
|
|
// -------------------------------
|
|
// Proxy raycasting
|
|
// -------------------------------
|
|
if (projectionModel == PROJECTIONMODEL_PROXY)
|
|
{
|
|
ScreenSpaceProxyRaycastInput ssRayInput;
|
|
ZERO_INITIALIZE(ScreenSpaceProxyRaycastInput, ssRayInput);
|
|
|
|
ssRayInput.rayOriginWS = rayOriginWS;
|
|
ssRayInput.rayDirWS = rayDirWS;
|
|
#ifdef DEBUG_DISPLAY
|
|
ssRayInput.debug = debug;
|
|
#endif
|
|
ssRayInput.proxyData = envLightData;
|
|
|
|
#if HAS_REFRACTION
|
|
if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFRACTION)
|
|
hitSuccessful = ScreenSpaceProxyRaycastRefraction(ssRayInput, hit);
|
|
else
|
|
#endif
|
|
if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFLECTION)
|
|
hitSuccessful = ScreenSpaceProxyRaycastReflection(ssRayInput, hit);
|
|
}
|
|
|
|
// -------------------------------
|
|
// HiZ raymarching
|
|
// -------------------------------
|
|
else if (projectionModel == PROJECTIONMODEL_HI_Z)
|
|
{
|
|
ScreenSpaceRaymarchInput ssRayInput;
|
|
ZERO_INITIALIZE(ScreenSpaceRaymarchInput, ssRayInput);
|
|
|
|
// Jitter the ray origin to trade some noise instead of banding effect
|
|
ssRayInput.rayOriginWS = rayOriginWS + rayDirWS * SampleBayer4(posInput.positionSS + uint2(_FrameCount, uint(_FrameCount) / 4u)) * 0.1;
|
|
ssRayInput.rayDirWS = rayDirWS;
|
|
#ifdef DEBUG_DISPLAY
|
|
ssRayInput.debug = debug;
|
|
#endif
|
|
|
|
#if HAS_REFRACTION
|
|
if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFRACTION)
|
|
hitSuccessful = ScreenSpaceHiZRaymarchRefraction(ssRayInput, hit, hitWeight);
|
|
else
|
|
#endif
|
|
if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFLECTION)
|
|
hitSuccessful = ScreenSpaceHiZRaymarchReflection(ssRayInput, hit, hitWeight);
|
|
}
|
|
|
|
// Debug screen space tracing
|
|
#ifdef DEBUG_DISPLAY
|
|
if (_DebugLightingMode == debugMode
|
|
&& _DebugLightingSubMode != DEBUGSCREENSPACETRACING_COLOR
|
|
&& _DebugLightingSubMode != DEBUGSCREENSPACETRACING_LINEAR_SAMPLED_COLOR
|
|
&& _DebugLightingSubMode != DEBUGSCREENSPACETRACING_HI_ZSAMPLED_COLOR
|
|
)
|
|
{
|
|
float weight = 1.0;
|
|
UpdateLightingHierarchyWeights(hierarchyWeight, weight);
|
|
if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFRACTION)
|
|
lighting.specularTransmitted = hit.debugOutput;
|
|
else if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFLECTION)
|
|
lighting.specularReflected = hit.debugOutput;
|
|
return lighting;
|
|
}
|
|
#endif
|
|
|
|
if (!hitSuccessful)
|
|
return lighting;
|
|
|
|
// -------------------------------
|
|
// Resolve weight and color
|
|
// -------------------------------
|
|
// Fade pixels near the texture buffers' borders
|
|
float2 weightNDC = clamp(min(hit.positionNDC, 1 - hit.positionNDC) * invScreenWeightDistance, 0, 1);
|
|
weightNDC = weightNDC * weightNDC * (3 - 2 * weightNDC);
|
|
// TODO: Fade pixels with normal non facing the ray direction
|
|
// TODO: Fade pixels marked as foreground in stencil
|
|
float weight = weightNDC.x * weightNDC.y * hitWeight;
|
|
|
|
// Exit if texel is discarded
|
|
if (weight == 0)
|
|
// Do nothing and don't update the hierarchy weight so we can fall back on refraction probe
|
|
return lighting;
|
|
|
|
float hitDeviceDepth = LOAD_TEXTURE2D_LOD(_DepthPyramidTexture, hit.positionSS, 0).r;
|
|
float hitLinearDepth = LinearEyeDepth(hitDeviceDepth, _ZBufferParams);
|
|
|
|
float2 samplingPositionNDC = hit.positionNDC;
|
|
#if HAS_REFRACTION
|
|
if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFRACTION
|
|
&& hitLinearDepth < posInput.linearDepth)
|
|
samplingPositionNDC = posInput.positionNDC;
|
|
#endif
|
|
|
|
UpdateLightingHierarchyWeights(hierarchyWeight, weight); // Shouldn't be needed, but safer in case we decide to change hierarchy priority
|
|
|
|
float2 hitVelocityNDC = 0;
|
|
if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFLECTION)
|
|
{
|
|
// Reproject color pyramid
|
|
float4 hitVelocityBuffer = LOAD_TEXTURE2D_LOD(
|
|
_CameraMotionVectorsTexture,
|
|
hit.positionSS,
|
|
0.0
|
|
);
|
|
DecodeVelocity(hitVelocityBuffer, hitVelocityNDC);
|
|
}
|
|
|
|
float3 preLD = SAMPLE_TEXTURE2D_LOD(
|
|
_ColorPyramidTexture,
|
|
s_trilinear_clamp_sampler,
|
|
// Offset by half a texel to properly interpolate between this pixel and its mips
|
|
(samplingPositionNDC - hitVelocityNDC) * _ColorPyramidScale.xy + _ColorPyramidSize.zw * 0.5,
|
|
mipLevel
|
|
).rgb;
|
|
|
|
// With HiZ, we use a temporal filtering to reduce the noise from the ray origin jittering
|
|
if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFLECTION && projectionModel == PROJECTIONMODEL_HI_Z)
|
|
{
|
|
float4 currentVelocityBuffer = LOAD_TEXTURE2D_LOD(
|
|
_CameraMotionVectorsTexture,
|
|
posInput.positionSS,
|
|
0.0
|
|
);
|
|
|
|
float2 currentVelocityNDC;
|
|
DecodeVelocity(currentVelocityBuffer, currentVelocityNDC);
|
|
|
|
float3 currentLD = LOAD_TEXTURE2D_LOD(
|
|
_ColorPyramidTexture,
|
|
int2(posInput.positionSS) - int2(currentVelocityNDC * _ScreenSize.xy),
|
|
0
|
|
).rgb;
|
|
preLD = preLD * (1.0 - temporalFilteringWeight) + currentLD * temporalFilteringWeight;
|
|
}
|
|
|
|
// We use specularFGD as an approximation of the fresnel effect (that also handle smoothness)
|
|
float3 F = preLightData.specularFGD;
|
|
|
|
// -------------------------------
|
|
// Assign color
|
|
// -------------------------------
|
|
#if HAS_REFRACTION
|
|
if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFRACTION)
|
|
lighting.specularTransmitted = (1.0 - F) * preLD.rgb * preLightData.transparentTransmittance * weight;
|
|
else
|
|
#endif
|
|
if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFLECTION)
|
|
lighting.specularReflected = F * preLD.rgb * weight;
|
|
|
|
#ifdef DEBUG_DISPLAY
|
|
if (debug)
|
|
{
|
|
ScreenSpaceTracingDebug debug = _DebugScreenSpaceTracingData[0];
|
|
debug.lightingSampledColor = preLD;
|
|
if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFRACTION)
|
|
debug.lightingSpecularFGD = 1.0 - F;
|
|
else if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFLECTION)
|
|
debug.lightingSpecularFGD = F;
|
|
debug.lightingWeight = weight;
|
|
_DebugScreenSpaceTracingData[0] = debug;
|
|
}
|
|
|
|
if (_DebugLightingMode == debugMode
|
|
&& (_DebugLightingSubMode == DEBUGSCREENSPACETRACING_LINEAR_SAMPLED_COLOR
|
|
|| _DebugLightingSubMode == DEBUGSCREENSPACETRACING_HI_ZSAMPLED_COLOR))
|
|
{
|
|
float weight = 1.0;
|
|
UpdateLightingHierarchyWeights(hierarchyWeight, weight);
|
|
if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFRACTION)
|
|
lighting.specularTransmitted = preLD.rgb;
|
|
else if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFLECTION)
|
|
lighting.specularReflected = preLD.rgb;
|
|
return lighting;
|
|
}
|
|
#endif
|
|
|
|
return lighting;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// EvaluateBSDF_Env
|
|
// ----------------------------------------------------------------------------
|
|
|
|
// _preIntegratedFGD and _CubemapLD are unique for each BRDF
|
|
IndirectLighting EvaluateBSDF_Env( LightLoopContext lightLoopContext,
|
|
float3 V, PositionInputs posInput,
|
|
PreLightData preLightData, EnvLightData lightData, BSDFData bsdfData,
|
|
int influenceShapeType, int GPUImageBasedLightingType,
|
|
inout float hierarchyWeight)
|
|
{
|
|
IndirectLighting lighting;
|
|
ZERO_INITIALIZE(IndirectLighting, lighting);
|
|
#if !HAS_REFRACTION
|
|
if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFRACTION)
|
|
return lighting;
|
|
#endif
|
|
|
|
float3 envLighting;
|
|
float3 positionWS = posInput.positionWS;
|
|
float weight = 1.0;
|
|
|
|
#ifdef LIT_DISPLAY_REFERENCE_IBL
|
|
|
|
envLighting = IntegrateSpecularGGXIBLRef(lightLoopContext, V, preLightData, lightData, bsdfData);
|
|
|
|
// TODO: Do refraction reference (is it even possible ?)
|
|
// TODO: handle clear coat
|
|
|
|
|
|
// #ifdef USE_DIFFUSE_LAMBERT_BRDF
|
|
// envLighting += IntegrateLambertIBLRef(lightData, V, bsdfData);
|
|
// #else
|
|
// envLighting += IntegrateDisneyDiffuseIBLRef(lightLoopContext, V, preLightData, lightData, bsdfData);
|
|
// #endif
|
|
|
|
#else
|
|
|
|
float3 R = preLightData.iblR;
|
|
|
|
#if HAS_REFRACTION
|
|
if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFRACTION)
|
|
{
|
|
positionWS = preLightData.transparentPositionWS;
|
|
R = preLightData.transparentRefractV;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
if (!IsEnvIndexTexture2D(lightData.envIndex)) // ENVCACHETYPE_CUBEMAP
|
|
{
|
|
R = GetSpecularDominantDir(bsdfData.normalWS, R, preLightData.iblPerceptualRoughness, ClampNdotV(preLightData.NdotV));
|
|
// When we are rough, we tend to see outward shifting of the reflection when at the boundary of the projection volume
|
|
// Also it appear like more sharp. To avoid these artifact and at the same time get better match to reference we lerp to original unmodified reflection.
|
|
// Formula is empirical.
|
|
float roughness = PerceptualRoughnessToRoughness(preLightData.iblPerceptualRoughness);
|
|
R = lerp(R, preLightData.iblR, saturate(smoothstep(0, 1, roughness * roughness)));
|
|
}
|
|
}
|
|
|
|
// Note: using influenceShapeType and projectionShapeType instead of (lightData|proxyData).shapeType allow to make compiler optimization in case the type is know (like for sky)
|
|
EvaluateLight_EnvIntersection(positionWS, bsdfData.normalWS, lightData, influenceShapeType, R, weight);
|
|
|
|
// Don't do clear coating for refraction
|
|
float3 coatR = preLightData.coatIblR;
|
|
if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFLECTION && HasFlag(bsdfData.materialFeatures, MATERIALFEATUREFLAGS_LIT_CLEAR_COAT))
|
|
{
|
|
float unusedWeight = 0.0;
|
|
EvaluateLight_EnvIntersection(positionWS, bsdfData.normalWS, lightData, influenceShapeType, coatR, unusedWeight);
|
|
}
|
|
|
|
float3 F = preLightData.specularFGD;
|
|
|
|
float iblMipLevel;
|
|
// TODO: We need to match the PerceptualRoughnessToMipmapLevel formula for planar, so we don't do this test (which is specific to our current lightloop)
|
|
// Specific case for Texture2Ds, their convolution is a gaussian one and not a GGX one - So we use another roughness mip mapping.
|
|
#if !defined(SHADER_API_METAL)
|
|
if (IsEnvIndexTexture2D(lightData.envIndex))
|
|
{
|
|
// Empirical remapping
|
|
iblMipLevel = PlanarPerceptualRoughnessToMipmapLevel(preLightData.iblPerceptualRoughness, _ColorPyramidScale.z);
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
iblMipLevel = PerceptualRoughnessToMipmapLevel(preLightData.iblPerceptualRoughness);
|
|
}
|
|
|
|
float4 preLD = SampleEnv(lightLoopContext, lightData.envIndex, R, iblMipLevel);
|
|
weight *= preLD.a; // Used by planar reflection to discard pixel
|
|
|
|
if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFLECTION)
|
|
{
|
|
envLighting = F * preLD.rgb;
|
|
|
|
// Evaluate the Clear Coat component if needed
|
|
if (HasFlag(bsdfData.materialFeatures, MATERIALFEATUREFLAGS_LIT_CLEAR_COAT))
|
|
{
|
|
// No correction needed for coatR as it is smooth
|
|
// Note: coat F is scalar as it is a dieletric
|
|
envLighting *= Sq(1.0 - preLightData.coatIblF);
|
|
|
|
// Evaluate the Clear Coat color
|
|
float4 preLD = SampleEnv(lightLoopContext, lightData.envIndex, coatR, 0.0);
|
|
envLighting += preLightData.coatIblF * preLD.rgb;
|
|
|
|
// Can't attenuate diffuse lighting here, may try to apply something on bakeLighting in PostEvaluateBSDF
|
|
}
|
|
}
|
|
#if HAS_REFRACTION
|
|
else
|
|
{
|
|
// No clear coat support with refraction
|
|
|
|
// specular transmisted lighting is the remaining of the reflection (let's use this approx)
|
|
// With refraction, we don't care about the clear coat value, only about the Fresnel, thus why we use 'envLighting ='
|
|
envLighting = (1.0 - F) * preLD.rgb * preLightData.transparentTransmittance;
|
|
}
|
|
#endif
|
|
|
|
#endif // LIT_DISPLAY_REFERENCE_IBL
|
|
|
|
UpdateLightingHierarchyWeights(hierarchyWeight, weight);
|
|
envLighting *= weight * lightData.multiplier;
|
|
|
|
if (GPUImageBasedLightingType == GPUIMAGEBASEDLIGHTINGTYPE_REFLECTION)
|
|
lighting.specularReflected = envLighting;
|
|
#if HAS_REFRACTION
|
|
else
|
|
lighting.specularTransmitted = envLighting * preLightData.transparentTransmittance;
|
|
#endif
|
|
|
|
return lighting;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// PostEvaluateBSDF
|
|
// ----------------------------------------------------------------------------
|
|
|
|
void PostEvaluateBSDF( LightLoopContext lightLoopContext,
|
|
float3 V, PositionInputs posInput,
|
|
PreLightData preLightData, BSDFData bsdfData, BuiltinData builtinData, AggregateLighting lighting,
|
|
out float3 diffuseLighting, out float3 specularLighting)
|
|
{
|
|
AmbientOcclusionFactor aoFactor;
|
|
// Use GTAOMultiBounce approximation for ambient occlusion (allow to get a tint from the baseColor)
|
|
#if 0
|
|
GetScreenSpaceAmbientOcclusion(posInput.positionSS, preLightData.NdotV, bsdfData.perceptualRoughness, bsdfData.ambientOcclusion, bsdfData.specularOcclusion, aoFactor);
|
|
#else
|
|
GetScreenSpaceAmbientOcclusionMultibounce(posInput.positionSS, preLightData.NdotV, bsdfData.perceptualRoughness, bsdfData.ambientOcclusion, bsdfData.specularOcclusion, bsdfData.diffuseColor, bsdfData.fresnel0, aoFactor);
|
|
#endif
|
|
ApplyAmbientOcclusionFactor(aoFactor, builtinData, lighting);
|
|
|
|
// Subsurface scattering mode
|
|
float3 modifiedDiffuseColor = GetModifiedDiffuseColorForSSS(bsdfData);
|
|
|
|
// Apply the albedo to the direct diffuse lighting (only once). The indirect (baked)
|
|
// diffuse lighting has already multiply the albedo in ModifyBakedDiffuseLighting().
|
|
// Note: In deferred bakeDiffuseLighting also contain emissive and in this case emissiveColor is 0
|
|
diffuseLighting = modifiedDiffuseColor * lighting.direct.diffuse + builtinData.bakeDiffuseLighting + builtinData.emissiveColor;
|
|
|
|
// If refraction is enable we use the transmittanceMask to lerp between current diffuse lighting and refraction value
|
|
// Physically speaking, transmittanceMask should be 1, but for artistic reasons, we let the value vary
|
|
#if HAS_REFRACTION
|
|
diffuseLighting = lerp(diffuseLighting, lighting.indirect.specularTransmitted, bsdfData.transmittanceMask);
|
|
#endif
|
|
|
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specularLighting = lighting.direct.specular + lighting.indirect.specularReflected;
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// Rescale the GGX to account for the multiple scattering.
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specularLighting *= 1.0 + bsdfData.fresnel0 * preLightData.energyCompensation;
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#ifdef DEBUG_DISPLAY
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PostEvaluateBSDFDebugDisplay(aoFactor, builtinData, lighting, bsdfData.diffuseColor, diffuseLighting, specularLighting);
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#endif
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}
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#endif // #ifdef HAS_LIGHTLOOP
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