31 lines
1.1 KiB
GLSL
Executable file
31 lines
1.1 KiB
GLSL
Executable file
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vec3 shIrradiance(const vec3 nor, const vec4 shirr[7]) {
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const float c1 = 0.429043;
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const float c2 = 0.511664;
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const float c3 = 0.743125;
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const float c4 = 0.886227;
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const float c5 = 0.247708;
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// TODO: Use padding for 4th component and pass shirr[].xyz directly
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vec3 cl00 = vec3(shirr[0].x, shirr[0].y, shirr[0].z);
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vec3 cl1m1 = vec3(shirr[0].w, shirr[1].x, shirr[1].y);
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vec3 cl10 = vec3(shirr[1].z, shirr[1].w, shirr[2].x);
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vec3 cl11 = vec3(shirr[2].y, shirr[2].z, shirr[2].w);
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vec3 cl2m2 = vec3(shirr[3].x, shirr[3].y, shirr[3].z);
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vec3 cl2m1 = vec3(shirr[3].w, shirr[4].x, shirr[4].y);
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vec3 cl20 = vec3(shirr[4].z, shirr[4].w, shirr[5].x);
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vec3 cl21 = vec3(shirr[5].y, shirr[5].z, shirr[5].w);
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vec3 cl22 = vec3(shirr[6].x, shirr[6].y, shirr[6].z);
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return (
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c1 * cl22 * (nor.y * nor.y - (-nor.z) * (-nor.z)) +
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c3 * cl20 * nor.x * nor.x +
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c4 * cl00 -
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c5 * cl20 +
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2.0 * c1 * cl2m2 * nor.y * (-nor.z) +
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2.0 * c1 * cl21 * nor.y * nor.x +
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2.0 * c1 * cl2m1 * (-nor.z) * nor.x +
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2.0 * c2 * cl11 * nor.y +
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2.0 * c2 * cl1m1 * (-nor.z) +
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2.0 * c2 * cl10 * nor.x
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);
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}
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