27 lines
1.1 KiB
Plaintext
27 lines
1.1 KiB
Plaintext
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// Separable SSS Transmittance Function, ref to sss_pass
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vec3 SSSSTransmittance(mat4 LWVP, vec3 p, vec3 n, vec3 l, float lightFar, sampler2DShadow shadowMap) {
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const float translucency = 1.0;
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vec4 shrinkedPos = vec4(p - 0.005 * n, 1.0);
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vec4 shadowPos = LWVP * shrinkedPos;
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float scale = 8.25 * (1.0 - translucency) / (sssWidth / 10.0);
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float d1 = texture(shadowMap, vec3(shadowPos.xy / shadowPos.w, shadowPos.z)).r; // 'd1' has a range of 0..1
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float d2 = shadowPos.z; // 'd2' has a range of 0..'lightFarPlane'
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d1 *= lightFar; // So we scale 'd1' accordingly:
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float d = scale * abs(d1 - d2);
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float dd = -d * d;
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vec3 profile = vec3(0.233, 0.455, 0.649) * exp(dd / 0.0064) +
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vec3(0.1, 0.336, 0.344) * exp(dd / 0.0484) +
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vec3(0.118, 0.198, 0.0) * exp(dd / 0.187) +
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vec3(0.113, 0.007, 0.007) * exp(dd / 0.567) +
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vec3(0.358, 0.004, 0.0) * exp(dd / 1.99) +
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vec3(0.078, 0.0, 0.0) * exp(dd / 7.41);
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return profile * clamp(0.3 + dot(l, -n), 0.0, 1.0);
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}
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vec3 SSSSTransmittanceCube(float translucency, vec4 shadowPos, vec3 n, vec3 l, float lightFar) {
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// TODO
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return vec3(0.0);
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}
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