forked from bartvdbraak/blender
9a1c1f132d
transmission pass and filter glossy option. The BSDF closure class is now more similar to the SVM closures, and includes some flags and labels that are needed to properly categorize the BSDF's for render passes. Phong closure is gone for the moment, needs to be adapated to the new structure still.
100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
/*
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* Copyright 2011, Blender Foundation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef __BSDF_OREN_NAYAR_H__
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#define __BSDF_OREN_NAYAR_H__
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CCL_NAMESPACE_BEGIN
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__device float3 bsdf_oren_nayar_get_intensity(const ShaderClosure *sc, float3 n, float3 v, float3 l)
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{
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float nl = max(dot(n, l), 0.0f);
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float nv = max(dot(n, v), 0.0f);
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float t = dot(l, v) - nl * nv;
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if (t > 0.0f)
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t /= max(nl, nv) + FLT_MIN;
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float is = nl * (sc->data0 + sc->data1 * t);
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return make_float3(is, is, is);
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}
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__device int bsdf_oren_nayar_setup(ShaderClosure *sc)
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{
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float sigma = sc->data0;
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sc->type = CLOSURE_BSDF_OREN_NAYAR_ID;
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sigma = clamp(sigma, 0.0f, 1.0f);
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float div = 1.0f / (M_PI_F + ((3.0f * M_PI_F - 4.0f) / 6.0f) * sigma);
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sc->data0 = 1.0f * div;
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sc->data1 = sigma * div;
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return SD_BSDF | SD_BSDF_HAS_EVAL;
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}
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__device void bsdf_oren_nayar_blur(ShaderClosure *sc, float roughness)
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{
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}
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__device float3 bsdf_oren_nayar_eval_reflect(const ShaderClosure *sc, const float3 I, const float3 omega_in, float *pdf)
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{
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if (dot(sc->N, omega_in) > 0.0f) {
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*pdf = 0.5f * M_1_PI_F;
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return bsdf_oren_nayar_get_intensity(sc, sc->N, I, omega_in);
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}
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else {
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*pdf = 0.0f;
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return make_float3(0.0f, 0.0f, 0.0f);
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}
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}
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__device float3 bsdf_oren_nayar_eval_transmit(const ShaderClosure *sc, const float3 I, const float3 omega_in, float *pdf)
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{
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return make_float3(0.0f, 0.0f, 0.0f);
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}
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__device int bsdf_oren_nayar_sample(const ShaderClosure *sc, float3 Ng, float3 I, float3 dIdx, float3 dIdy, float randu, float randv, float3 *eval, float3 *omega_in, float3 *domega_in_dx, float3 *domega_in_dy, float *pdf)
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{
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sample_uniform_hemisphere(sc->N, randu, randv, omega_in, pdf);
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if (dot(Ng, *omega_in) > 0.0f) {
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*eval = bsdf_oren_nayar_get_intensity(sc, sc->N, I, *omega_in);
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#ifdef __RAY_DIFFERENTIALS__
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// TODO: find a better approximation for the bounce
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*domega_in_dx = (2.0f * dot(sc->N, dIdx)) * sc->N - dIdx;
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*domega_in_dy = (2.0f * dot(sc->N, dIdy)) * sc->N - dIdy;
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*domega_in_dx *= 125.0f;
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*domega_in_dy *= 125.0f;
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#endif
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}
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else {
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*pdf = 0.0f;
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*eval = make_float3(0.0f, 0.0f, 0.0f);
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}
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return LABEL_REFLECT | LABEL_DIFFUSE;
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}
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CCL_NAMESPACE_END
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#endif /* __BSDF_OREN_NAYAR_H__ */
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