Campbell Barton
e12c08e8d1
Apply clang format as proposed in T53211. For details on usage and instructions for migrating branches without conflicts, see: https://wiki.blender.org/wiki/Tools/ClangFormat
108 lines
2.4 KiB
GLSL
108 lines
2.4 KiB
GLSL
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uniform sampler1D texHammersley;
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uniform sampler2D texJitter;
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uniform float sampleCount;
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uniform float invSampleCount;
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vec2 jitternoise = vec2(0.0);
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#ifndef UTIL_TEX
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# define UTIL_TEX
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uniform sampler2DArray utilTex;
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# define texelfetch_noise_tex(coord) texelFetch(utilTex, ivec3(ivec2(coord) % LUT_SIZE, 2.0), 0)
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#endif /* UTIL_TEX */
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void setup_noise(void)
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{
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jitternoise = texelfetch_noise_tex(gl_FragCoord.xy).rg; /* Global variable */
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}
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#ifdef HAMMERSLEY_SIZE
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vec3 hammersley_3d(float i, float invsamplenbr)
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{
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vec3 Xi; /* Theta, cos(Phi), sin(Phi) */
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Xi.x = i * invsamplenbr; /* i/samples */
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Xi.x = fract(Xi.x + jitternoise.x);
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int u = int(mod(i + jitternoise.y * HAMMERSLEY_SIZE, HAMMERSLEY_SIZE));
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Xi.yz = texelFetch(texHammersley, u, 0).rg;
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return Xi;
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}
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vec3 hammersley_3d(float i)
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{
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return hammersley_3d(i, invSampleCount);
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}
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#endif
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/* -------------- BSDFS -------------- */
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float pdf_ggx_reflect(float NH, float a2)
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{
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return NH * a2 / D_ggx_opti(NH, a2);
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}
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float pdf_hemisphere()
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{
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return 0.5 * M_1_PI;
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}
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vec3 sample_ggx(vec3 rand, float a2)
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{
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/* Theta is the aperture angle of the cone */
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float z = sqrt((1.0 - rand.x) / (1.0 + a2 * rand.x - rand.x)); /* cos theta */
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float r = sqrt(max(0.0, 1.0f - z * z)); /* sin theta */
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float x = r * rand.y;
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float y = r * rand.z;
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/* Microfacet Normal */
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return vec3(x, y, z);
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}
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vec3 sample_ggx(vec3 rand, float a2, vec3 N, vec3 T, vec3 B, out float NH)
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{
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vec3 Ht = sample_ggx(rand, a2);
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NH = Ht.z;
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return tangent_to_world(Ht, N, T, B);
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}
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#ifdef HAMMERSLEY_SIZE
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vec3 sample_ggx(float nsample, float a2, vec3 N, vec3 T, vec3 B)
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{
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vec3 Xi = hammersley_3d(nsample);
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vec3 Ht = sample_ggx(Xi, a2);
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return tangent_to_world(Ht, N, T, B);
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}
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vec3 sample_hemisphere(float nsample, vec3 N, vec3 T, vec3 B)
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{
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vec3 Xi = hammersley_3d(nsample);
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float z = Xi.x; /* cos theta */
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float r = sqrt(max(0.0, 1.0f - z * z)); /* sin theta */
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float x = r * Xi.y;
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float y = r * Xi.z;
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vec3 Ht = vec3(x, y, z);
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return tangent_to_world(Ht, N, T, B);
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}
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vec3 sample_cone(float nsample, float angle, vec3 N, vec3 T, vec3 B)
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{
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vec3 Xi = hammersley_3d(nsample);
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float z = cos(angle * Xi.x); /* cos theta */
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float r = sqrt(max(0.0, 1.0f - z * z)); /* sin theta */
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float x = r * Xi.y;
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float y = r * Xi.z;
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vec3 Ht = vec3(x, y, z);
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return tangent_to_world(Ht, N, T, B);
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}
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#endif
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