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Diffstat (limited to 'intern/cycles/kernel/shaders/stdcycles.h')
| -rw-r--r-- | intern/cycles/kernel/shaders/stdcycles.h | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/intern/cycles/kernel/shaders/stdcycles.h b/intern/cycles/kernel/shaders/stdcycles.h new file mode 100644 index 00000000000..8c27f31a357 --- /dev/null +++ b/intern/cycles/kernel/shaders/stdcycles.h @@ -0,0 +1,151 @@ +///////////////////////////////////////////////////////////////////////////// +// Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al. All Rights Reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above copyright +// notice, this list of conditions and the following disclaimer in the +// documentation and/or other materials provided with the distribution. +// * Neither the name of Sony Pictures Imageworks nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +///////////////////////////////////////////////////////////////////////////// + +#ifndef CCL_STDCYCLESOSL_H +#define CCL_STDCYCLESOSL_H + +#include "stdosl.h" + +// Declaration of built-in functions and closures, stdosl.h does not make +// these available so we have to redefine them. +#define BUILTIN [[int builtin = 1]] +#define BUILTIN_DERIV [[ int builtin = 1, int deriv = 1 ]] + +closure color diffuse_ramp(normal N, color colors[8]) BUILTIN; +closure color phong_ramp(normal N, float exponent, color colors[8]) BUILTIN; +closure color diffuse_toon(normal N, float size, float smooth) BUILTIN; +closure color glossy_toon(normal N, float size, float smooth) BUILTIN; +closure color microfacet_ggx(normal N, float ag) BUILTIN; +closure color microfacet_ggx_aniso(normal N, vector T, float ax, float ay) BUILTIN; +closure color microfacet_ggx_refraction(normal N, float ag, float eta) BUILTIN; +closure color microfacet_multi_ggx(normal N, float ag, color C) BUILTIN; +closure color microfacet_multi_ggx_aniso(normal N, vector T, float ax, float ay, color C) BUILTIN; +closure color microfacet_multi_ggx_glass(normal N, float ag, float eta, color C) BUILTIN; +closure color microfacet_ggx_fresnel(normal N, float ag, float eta, color C, color Cspec0) BUILTIN; +closure color microfacet_ggx_aniso_fresnel( + normal N, vector T, float ax, float ay, float eta, color C, color Cspec0) BUILTIN; +closure color +microfacet_multi_ggx_fresnel(normal N, float ag, float eta, color C, color Cspec0) BUILTIN; +closure color microfacet_multi_ggx_aniso_fresnel( + normal N, vector T, float ax, float ay, float eta, color C, color Cspec0) BUILTIN; +closure color +microfacet_multi_ggx_glass_fresnel(normal N, float ag, float eta, color C, color Cspec0) BUILTIN; +closure color microfacet_beckmann(normal N, float ab) BUILTIN; +closure color microfacet_beckmann_aniso(normal N, vector T, float ax, float ay) BUILTIN; +closure color microfacet_beckmann_refraction(normal N, float ab, float eta) BUILTIN; +closure color ashikhmin_shirley(normal N, vector T, float ax, float ay) BUILTIN; +closure color ashikhmin_velvet(normal N, float sigma) BUILTIN; +closure color ambient_occlusion() BUILTIN; +closure color principled_diffuse(normal N, float roughness) BUILTIN; +closure color principled_sheen(normal N) BUILTIN; +closure color principled_clearcoat(normal N, float clearcoat, float clearcoat_roughness) BUILTIN; + +// BSSRDF +closure color bssrdf(string method, normal N, vector radius, color albedo) BUILTIN; + +// Hair +closure color +hair_reflection(normal N, float roughnessu, float roughnessv, vector T, float offset) BUILTIN; +closure color +hair_transmission(normal N, float roughnessu, float roughnessv, vector T, float offset) BUILTIN; +closure color principled_hair(normal N, + color sigma, + float roughnessu, + float roughnessv, + float coat, + float alpha, + float eta) BUILTIN; + +// Volume +closure color henyey_greenstein(float g) BUILTIN; +closure color absorption() BUILTIN; + +normal ensure_valid_reflection(normal Ng, vector I, normal N) +{ + /* The implementation here mirrors the one in kernel_montecarlo.h, + * check there for an explanation of the algorithm. */ + + float sqr(float x) + { + return x * x; + } + + vector R = 2 * dot(N, I) * N - I; + + float threshold = min(0.9 * dot(Ng, I), 0.01); + if (dot(Ng, R) >= threshold) { + return N; + } + + float NdotNg = dot(N, Ng); + vector X = normalize(N - NdotNg * Ng); + + float Ix = dot(I, X), Iz = dot(I, Ng); + float Ix2 = sqr(Ix), Iz2 = sqr(Iz); + float a = Ix2 + Iz2; + + float b = sqrt(Ix2 * (a - sqr(threshold))); + float c = Iz * threshold + a; + + float fac = 0.5 / a; + float N1_z2 = fac * (b + c), N2_z2 = fac * (-b + c); + int valid1 = (N1_z2 > 1e-5) && (N1_z2 <= (1.0 + 1e-5)); + int valid2 = (N2_z2 > 1e-5) && (N2_z2 <= (1.0 + 1e-5)); + + float N_new_x, N_new_z; + if (valid1 && valid2) { + float N1_x = sqrt(1.0 - N1_z2), N1_z = sqrt(N1_z2); + float N2_x = sqrt(1.0 - N2_z2), N2_z = sqrt(N2_z2); + + float R1 = 2 * (N1_x * Ix + N1_z * Iz) * N1_z - Iz; + float R2 = 2 * (N2_x * Ix + N2_z * Iz) * N2_z - Iz; + + valid1 = (R1 >= 1e-5); + valid2 = (R2 >= 1e-5); + if (valid1 && valid2) { + N_new_x = (R1 < R2) ? N1_x : N2_x; + N_new_z = (R1 < R2) ? N1_z : N2_z; + } + else { + N_new_x = (R1 > R2) ? N1_x : N2_x; + N_new_z = (R1 > R2) ? N1_z : N2_z; + } + } + else if (valid1 || valid2) { + float Nz2 = valid1 ? N1_z2 : N2_z2; + N_new_x = sqrt(1.0 - Nz2); + N_new_z = sqrt(Nz2); + } + else { + return Ng; + } + + return N_new_x * X + N_new_z * Ng; +} + + +#endif /* CCL_STDOSL_H */ |