A game about forced loneliness, made by TACStudios
tacstudios.tngl.sh
1real3 ADD_FUNC_SUFFIX(ADD_NORMAL_FUNC_SUFFIX(SampleUVMappingNormal))(TEXTURE2D_PARAM(textureName, samplerName), UVMapping uvMapping, real scale, real param)
2{
3 if (uvMapping.mappingType == UV_MAPPING_TRIPLANAR)
4 {
5 real3 triplanarWeights = uvMapping.triplanarWeights;
6
7#ifdef SURFACE_GRADIENT
8 // Height map gradient. Basically, it encodes height map slopes along S and T axes.
9 real2 derivXplane;
10 real2 derivYPlane;
11 real2 derivZPlane;
12 derivXplane = derivYPlane = derivZPlane = real2(0.0, 0.0);
13
14 if (triplanarWeights.x > 0.0)
15 derivXplane = triplanarWeights.x * UNPACK_DERIVATIVE_FUNC(SAMPLE_TEXTURE_FUNC(textureName, samplerName, uvMapping.uvZY, param), scale);
16 if (triplanarWeights.y > 0.0)
17 derivYPlane = triplanarWeights.y * UNPACK_DERIVATIVE_FUNC(SAMPLE_TEXTURE_FUNC(textureName, samplerName, uvMapping.uvXZ, param), scale);
18 if (triplanarWeights.z > 0.0)
19 derivZPlane = triplanarWeights.z * UNPACK_DERIVATIVE_FUNC(SAMPLE_TEXTURE_FUNC(textureName, samplerName, uvMapping.uvXY, param), scale);
20
21 // Assume derivXplane, derivYPlane and derivZPlane sampled using (z,y), (x,z) and (x,y) respectively
22 // ie using Morten's convention http://jcgt.org/published/0009/03/04/ p80-81
23 real3 volumeGrad = real3(derivZPlane.x + derivYPlane.x, derivZPlane.y + derivXplane.y, derivXplane.x + derivYPlane.y);
24 return SurfaceGradientFromVolumeGradient(uvMapping.normalWS, volumeGrad);
25#else
26 real3 val = real3(0.0, 0.0, 0.0);
27
28 if (triplanarWeights.x > 0.0)
29 val += triplanarWeights.x * UNPACK_NORMAL_FUNC(SAMPLE_TEXTURE_FUNC(textureName, samplerName, uvMapping.uvZY, param), scale);
30 if (triplanarWeights.y > 0.0)
31 val += triplanarWeights.y * UNPACK_NORMAL_FUNC(SAMPLE_TEXTURE_FUNC(textureName, samplerName, uvMapping.uvXZ, param), scale);
32 if (triplanarWeights.z > 0.0)
33 val += triplanarWeights.z * UNPACK_NORMAL_FUNC(SAMPLE_TEXTURE_FUNC(textureName, samplerName, uvMapping.uvXY, param), scale);
34
35 return normalize(val);
36#endif
37 }
38#ifdef SURFACE_GRADIENT
39 else if (uvMapping.mappingType == UV_MAPPING_PLANAR)
40 {
41 // Note: Planar is on uv coordinate (and not uvXZ)
42 real2 derivYPlane = UNPACK_DERIVATIVE_FUNC(SAMPLE_TEXTURE_FUNC(textureName, samplerName, uvMapping.uv, param), scale);
43 // See comment above
44 real3 volumeGrad = real3(derivYPlane.x, 0.0, derivYPlane.y);
45 return SurfaceGradientFromVolumeGradient(uvMapping.normalWS, volumeGrad);
46 }
47#endif
48 else
49 {
50#ifdef SURFACE_GRADIENT
51 real2 deriv = UNPACK_DERIVATIVE_FUNC(SAMPLE_TEXTURE_FUNC(textureName, samplerName, uvMapping.uv, param), scale);
52 return SurfaceGradientFromTBN(deriv, uvMapping.tangentWS, uvMapping.bitangentWS);
53#else
54 return UNPACK_NORMAL_FUNC(SAMPLE_TEXTURE_FUNC(textureName, samplerName, uvMapping.uv, param), scale);
55#endif
56 }
57}