47 lines
1.6 KiB
GLSL
47 lines
1.6 KiB
GLSL
vec3 GetN(int idx) {
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if (idx == 230) return vec3(2.9114, 2.9497, 2.5845);
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if (idx == 231) return vec3(0.18299, 0.42108, 1.3734);
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if (idx == 232) return vec3(1.3456, 0.96521, 0.61722);
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if (idx == 233) return vec3(3.1071, 3.1812, 2.3230);
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if (idx == 234) return vec3(0.27105, 0.67693, 1.3164);
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if (idx == 235) return vec3(1.9100, 1.8300, 1.4400);
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if (idx == 236) return vec3(2.3757, 2.0847, 1.8453);
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if (idx == 237) return vec3(0.15943, 0.14512, 0.13547);
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return vec3(0.0);
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}
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vec3 GetK(int idx) {
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if (idx == 230) return vec3(3.0893, 2.9318, 2.7670);
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if (idx == 231) return vec3(3.4242, 2.3459, 1.7704);
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if (idx == 232) return vec3(7.4746, 6.3995, 5.3031);
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if (idx == 233) return vec3(3.3314, 3.3291, 3.1350);
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if (idx == 234) return vec3(3.6092, 2.6248, 2.2921);
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if (idx == 235) return vec3(3.5100, 3.4000, 3.1800);
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if (idx == 236) return vec3(4.2655, 3.7153, 3.1365);
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if (idx == 237) return vec3(3.9291, 3.1900, 2.3808);
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return vec3(1.0);
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}
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vec3 ComplexFresnel(float fresnel, float f0) {
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int metalidx = int(f0 * 255.0);
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vec3 k = GetK(metalidx);
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vec3 n = GetN(metalidx);
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float f = 1.0 - fresnel;
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vec3 k2 = k * k;
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vec3 n2 = n * n;
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float f2 = f * f;
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vec3 rs_num = n2 + k2 - 2 * n * f + f2;
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vec3 rs_den = n2 + k2 + 2 * n * f + f2;
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vec3 rs = rs_num / rs_den;
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vec3 rp_num = (n2 + k2) * f2 - 2 * n * f + 1;
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vec3 rp_den = (n2 + k2) * f2 + 2 * n * f + 1;
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vec3 rp = rp_num / rp_den;
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vec3 fresnel3 = clamp(0.5 * (rs + rp), vec3(0.0), vec3(1.0));
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fresnel3 *= fresnel3;
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return fresnel3;
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} |