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108 行
4.4 KiB
108 行
4.4 KiB
//-------------------------------------------------------------------------------------
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// Fill SurfaceData/Builtin data function
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//-------------------------------------------------------------------------------------
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#include "CoreRP/ShaderLibrary/Sampling/SampleUVMapping.hlsl"
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#include "../MaterialUtilities.hlsl"
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#include "TerrainLitSplatCommon.hlsl"
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TEXTURE2D(_MainTex);
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TEXTURE2D(_MetallicTex);
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SAMPLER(sampler_MainTex);
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#ifdef DEBUG_DISPLAY
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float4 _MainTex_TexelSize;
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float4 _MainTex_MipInfo;
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#endif
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// We don't use emission for terrain
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#define _EmissiveColor float3(0,0,0)
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#define _AlbedoAffectEmissive 0
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#include "../Lit/LitBuiltinData.hlsl"
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#undef _EmissiveColor
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#undef _AlbedoAffectEmissive
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#include "../Decal/DecalUtilities.hlsl"
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void GetSurfaceAndBuiltinData(FragInputs input, float3 V, inout PositionInputs posInput, out SurfaceData surfaceData, out BuiltinData builtinData)
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{
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#ifdef ENABLE_TERRAIN_PERPIXEL_NORMAL
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{
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float3 normalOS = SAMPLE_TEXTURE2D(_TerrainNormalmapTexture, sampler_MainTex, (input.texCoord0 + 0.5f) * _TerrainHeightmapRecipSize.xy).rgb * 2 - 1;
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float3 normalWS = mul((float3x3)GetObjectToWorldMatrix(), normalOS);
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float3 tangentWS = cross(GetObjectToWorldMatrix()._13_23_33, normalWS);
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float renormFactor = 1.0 / length(normalWS);
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// bitangent on the fly option in xnormal to reduce vertex shader outputs.
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// this is the mikktspace transformation (must use unnormalized attributes)
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float3x3 worldToTangent = CreateWorldToTangent(normalWS, tangentWS.xyz, 1);
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// surface gradient based formulation requires a unit length initial normal. We can maintain compliance with mikkts
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// by uniformly scaling all 3 vectors since normalization of the perturbed normal will cancel it.
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input.worldToTangent[0] = worldToTangent[0] * renormFactor;
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input.worldToTangent[1] = worldToTangent[1] * renormFactor;
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input.worldToTangent[2] = worldToTangent[2] * renormFactor; // normalizes the interpolated vertex normal
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input.texCoord0 *= _TerrainHeightmapRecipSize.zw;
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}
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#endif
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// terrain lightmap uvs are always taken from uv0
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input.texCoord1 = input.texCoord2 = input.texCoord0;
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surfaceData.baseColor = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, input.texCoord0).rgb;
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surfaceData.perceptualSmoothness = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, input.texCoord0).a;
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surfaceData.ambientOcclusion = SAMPLE_TEXTURE2D(_MetallicTex, sampler_MainTex, input.texCoord0).g;
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surfaceData.metallic = SAMPLE_TEXTURE2D(_MetallicTex, sampler_MainTex, input.texCoord0).r;
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surfaceData.tangentWS = normalize(input.worldToTangent[0].xyz); // The tangent is not normalize in worldToTangent for mikkt. Tag: SURFACE_GRADIENT
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surfaceData.subsurfaceMask = 0;
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surfaceData.thickness = 1;
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surfaceData.diffusionProfile = 0;
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surfaceData.materialFeatures = MATERIALFEATUREFLAGS_LIT_STANDARD;
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// Init other parameters
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surfaceData.anisotropy = 0.0;
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surfaceData.specularColor = float3(0.0, 0.0, 0.0);
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surfaceData.coatMask = 0.0;
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surfaceData.iridescenceThickness = 0.0;
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surfaceData.iridescenceMask = 0.0;
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// Transparency parameters
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// Use thickness from SSS
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surfaceData.ior = 1.0;
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surfaceData.transmittanceColor = float3(1.0, 1.0, 1.0);
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surfaceData.atDistance = 1000000.0;
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surfaceData.transmittanceMask = 0.0;
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#ifdef SURFACE_GRADIENT
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float3 normalTS = float3(0.0, 0.0, 0.0); // No gradient
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#else
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float3 normalTS = float3(0.0, 0.0, 1.0);
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#endif
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GetNormalWS(input, normalTS, surfaceData.normalWS);
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float3 bentNormalWS = surfaceData.normalWS;
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if (surfaceData.ambientOcclusion != 1.0f)
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surfaceData.specularOcclusion = GetSpecularOcclusionFromAmbientOcclusion(ClampNdotV(dot(surfaceData.normalWS, V)), surfaceData.ambientOcclusion, PerceptualSmoothnessToRoughness(surfaceData.perceptualSmoothness));
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else
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surfaceData.specularOcclusion = 1.0f;
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#if HAVE_DECALS
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float alpha = 1;
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AddDecalContribution(posInput, surfaceData, alpha);
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#endif
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#ifdef DEBUG_DISPLAY
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if (_DebugMipMapMode != DEBUGMIPMAPMODE_NONE)
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{
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surfaceData.baseColor = GetTextureDataDebug(_DebugMipMapMode, input.texCoord0, _MainTex, _MainTex_TexelSize, _MainTex_MipInfo, surfaceData.baseColor);
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surfaceData.metallic = 0;
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}
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#endif
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GetBuiltinData(input, V, posInput, surfaceData, 1, bentNormalWS, 0, builtinData);
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}
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