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91 行
5.1 KiB
91 行
5.1 KiB
// This structure abstract uv mapping inside one struct.
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// It represent a mapping of any uv (with its associated tangent space for derivative if SurfaceGradient mode) - UVSet0 to 4, planar, triplanar
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#define UV_MAPPING_UVSET 0
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#define UV_MAPPING_PLANAR 1
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// Planar/Triplanar convention for Unity in world space
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void GetTriplanarCoordinate(float3 position, out float2 uvXZ, out float2 uvXY, out float2 uvZY)
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{
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// Caution: This must follow the same rule as what is use for SurfaceGradient triplanar
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// TODO: Currently the normal mapping looks wrong without SURFACE_GRADIENT option because we don't handle corretly the tangent space
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uvXZ = float2(position.z, position.x);
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uvXY = float2(position.x, position.y);
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uvZY = float2(position.z, position.y);
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}
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struct UVMapping
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{
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int mappingType;
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float2 uv; // Current uv or planar uv
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float3 normalWS; // vertex normal
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};
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#define TEXTURE2D_ARGS(textureName, samplerName) Texture2D textureName, SamplerState samplerName
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#define TEXTURE2D_PARAM(textureName, samplerName) textureName, samplerName
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#define UNITY_SAMPLE_TEX2D_SAMPLER(tex,samplertex,coord) tex.Sample (samplertex,coord)
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#define UNITY_SAMPLE_TEX2D_LOD_SAMPLER(tex,samplertex,coord, lod) tex.SampleLevel (samplertex,coord, lod)
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#define UNITY_SAMPLE_TEX2D_BIAS_SAMPLER(tex,samplertex,coord, bias) tex.SampleBias (samplertex,coord, bias)
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float3 UnpackNormalRGB(float4 packedNormal, float scale = 1.0)
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{
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float3 normal;
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normal.xyz = packedNormal.rgb * 2.0 - 1.0;
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normal.xy *= scale;
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return normalize(normal);
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}
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float3 UnpackNormalAG(float4 packedNormal, float scale = 1.0)
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{
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float3 normal;
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normal.xy = packedNormal.wy * 2.0 - 1.0;
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normal.xy *= scale;
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normal.z = sqrt(1.0 - saturate(dot(normal.xy, normal.xy)));
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return normal;
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}
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float3 UnpackNormalmapRGorAG(float4 packedNormal, float scale = 1.0)
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{
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// This do the trick
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packedNormal.w *= packedNormal.x;
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return UnpackNormalAG(packedNormal, scale);
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}
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// Regular sampling functions
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#define ADD_FUNC_SUFFIX(Name) Name
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#define SAMPLE_TEXTURE_FUNC(textureName, samplerName, uvMapping, unused) UNITY_SAMPLE_TEX2D_SAMPLER(textureName, samplerName, uvMapping)
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#include "LayeredPhotogrammetrySampleUVMappingInternal.cginc"
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#undef ADD_FUNC_SUFFIX
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#undef SAMPLE_TEXTURE_FUNC
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// Lod sampling functions
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#define ADD_FUNC_SUFFIX(Name) Name##Lod
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#define SAMPLE_TEXTURE_FUNC(textureName, samplerName, uvMapping, lod) UNITY_SAMPLE_TEX2D_LOD_SAMPLER(textureName, samplerName, uvMapping, lod)
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#include "LayeredPhotogrammetrySampleUVMappingInternal.cginc"
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#undef ADD_FUNC_SUFFIX
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#undef SAMPLE_TEXTURE_FUNC
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// Bias sampling functions
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#define ADD_FUNC_SUFFIX(Name) Name##Bias
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#define SAMPLE_TEXTURE_FUNC(textureName, samplerName, uvMapping, bias) UNITY_SAMPLE_TEX2D_BIAS_SAMPLER(textureName, samplerName, uvMapping, bias)
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#include "LayeredPhotogrammetrySampleUVMappingInternal.cginc"
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#undef ADD_FUNC_SUFFIX
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#undef SAMPLE_TEXTURE_FUNC
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// Macro to improve readibility of surface data
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#define SAMPLE_UVMAPPING_TEXTURE2D(textureName, samplerName, uvMapping) SampleUVMapping(TEXTURE2D_PARAM(textureName, samplerName), uvMapping, 0.0) // Last 0.0 is unused
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#define SAMPLE_UVMAPPING_TEXTURE2D_LOD(textureName, samplerName, uvMapping, lod) SampleUVMappingLod(TEXTURE2D_PARAM(textureName, samplerName), uvMapping, lod)
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#define SAMPLE_UVMAPPING_TEXTURE2D_BIAS(textureName, samplerName, uvMapping, bias) SampleUVMappingBias(TEXTURE2D_PARAM(textureName, samplerName), uvMapping, bias)
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#define SAMPLE_UVMAPPING_NORMALMAP(textureName, samplerName, uvMapping, scale) SampleUVMappingNormal(TEXTURE2D_PARAM(textureName, samplerName), uvMapping, scale, 0.0)
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#define SAMPLE_UVMAPPING_NORMALMAP_LOD(textureName, samplerName, uvMapping, scale, lod) SampleUVMappingNormalLod(TEXTURE2D_PARAM(textureName, samplerName), uvMapping, scale, lod)
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#define SAMPLE_UVMAPPING_NORMALMAP_BIAS(textureName, samplerName, uvMapping, scale, bias) SampleUVMappingNormalBias(TEXTURE2D_PARAM(textureName, samplerName), uvMapping, scale, bias)
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#define SAMPLE_UVMAPPING_NORMALMAP_AG(textureName, samplerName, uvMapping, scale) SampleUVMappingNormalAG(TEXTURE2D_PARAM(textureName, samplerName), uvMapping, scale, 0.0)
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#define SAMPLE_UVMAPPING_NORMALMAP_AG_LOD(textureName, samplerName, uvMapping, scale, lod) SampleUVMappingNormalAGLod(TEXTURE2D_PARAM(textureName, samplerName), uvMapping, scale, lod)
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#define SAMPLE_UVMAPPING_NORMALMAP_AG_BIAS(textureName, samplerName, uvMapping, scale, bias) SampleUVMappingNormalAGBias(TEXTURE2D_PARAM(textureName, samplerName), uvMapping, scale, bias)
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#define SAMPLE_UVMAPPING_NORMALMAP_RGB(textureName, samplerName, uvMapping, scale) SampleUVMappingNormalRGB(TEXTURE2D_PARAM(textureName, samplerName), uvMapping, scale, 0.0)
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#define SAMPLE_UVMAPPING_NORMALMAP_RGB_LOD(textureName, samplerName, uvMapping, scale, lod) SampleUVMappingNormalRGBLod(TEXTURE2D_PARAM(textureName, samplerName), uvMapping, scale, lod)
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#define SAMPLE_UVMAPPING_NORMALMAP_RGB_BIAS(textureName, samplerName, uvMapping, scale, bias) SampleUVMappingNormalRGBBias(TEXTURE2D_PARAM(textureName, samplerName), uvMapping, scale, bias)
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