forked from bartvdbraak/blender
Brecht Van Lommel
c18712e868
This to avoids build conflicts with libc++ on FreeBSD, these __ prefixed values are reserved for compilers. I apologize to anyone who has patches or branches and has to go through the pain of merging this change, it may be easiest to do these same replacements in your code and then apply/merge the patch. Ref T37477.
136 lines
4.7 KiB
C
136 lines
4.7 KiB
C
/*
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* Adapted from Open Shading Language with this license:
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*
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* Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al.
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* All Rights Reserved.
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*
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* Modifications Copyright 2012, Blender Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Sony Pictures Imageworks nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __BSDF_PHONG_RAMP_H__
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#define __BSDF_PHONG_RAMP_H__
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CCL_NAMESPACE_BEGIN
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ccl_device float3 bsdf_phong_ramp_get_color(const ShaderClosure *sc, const float3 colors[8], float pos)
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{
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int MAXCOLORS = 8;
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float npos = pos * (float)(MAXCOLORS - 1);
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int ipos = float_to_int(npos);
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if (ipos < 0)
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return colors[0];
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if (ipos >= (MAXCOLORS - 1))
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return colors[MAXCOLORS - 1];
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float offset = npos - (float)ipos;
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return colors[ipos] * (1.0f - offset) + colors[ipos+1] * offset;
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}
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ccl_device int bsdf_phong_ramp_setup(ShaderClosure *sc)
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{
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sc->data0 = max(sc->data0, 0.0f);
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sc->type = CLOSURE_BSDF_PHONG_RAMP_ID;
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return SD_BSDF | SD_BSDF_HAS_EVAL | SD_BSDF_GLOSSY;
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}
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ccl_device void bsdf_phong_ramp_blur(ShaderClosure *sc, float roughness)
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{
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}
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ccl_device float3 bsdf_phong_ramp_eval_reflect(const ShaderClosure *sc, const float3 colors[8], const float3 I, const float3 omega_in, float *pdf)
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{
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float m_exponent = sc->data0;
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float cosNI = dot(sc->N, omega_in);
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float cosNO = dot(sc->N, I);
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if (cosNI > 0 && cosNO > 0) {
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// reflect the view vector
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float3 R = (2 * cosNO) * sc->N - I;
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float cosRI = dot(R, omega_in);
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if (cosRI > 0) {
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float cosp = powf(cosRI, m_exponent);
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float common = 0.5f * M_1_PI_F * cosp;
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float out = cosNI * (m_exponent + 2) * common;
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*pdf = (m_exponent + 1) * common;
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return bsdf_phong_ramp_get_color(sc, colors, cosp) * out;
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}
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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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ccl_device float3 bsdf_phong_ramp_eval_transmit(const ShaderClosure *sc, const float3 colors[8], 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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ccl_device int bsdf_phong_ramp_sample(const ShaderClosure *sc, const float3 colors[8], 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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float cosNO = dot(sc->N, I);
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float m_exponent = sc->data0;
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if (cosNO > 0) {
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// reflect the view vector
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float3 R = (2 * cosNO) * sc->N - I;
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#ifdef __RAY_DIFFERENTIALS__
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*domega_in_dx = (2 * dot(sc->N, dIdx)) * sc->N - dIdx;
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*domega_in_dy = (2 * dot(sc->N, dIdy)) * sc->N - dIdy;
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#endif
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float3 T, B;
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make_orthonormals (R, &T, &B);
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float phi = M_2PI_F * randu;
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float cosTheta = powf(randv, 1 / (m_exponent + 1));
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float sinTheta2 = 1 - cosTheta * cosTheta;
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float sinTheta = sinTheta2 > 0 ? sqrtf(sinTheta2) : 0;
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*omega_in = (cosf(phi) * sinTheta) * T +
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(sinf(phi) * sinTheta) * B +
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( cosTheta) * R;
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if (dot(Ng, *omega_in) > 0.0f)
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{
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// common terms for pdf and eval
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float cosNI = dot(sc->N, *omega_in);
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// make sure the direction we chose is still in the right hemisphere
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if (cosNI > 0)
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{
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float cosp = powf(cosTheta, m_exponent);
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float common = 0.5f * M_1_PI_F * cosp;
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*pdf = (m_exponent + 1) * common;
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float out = cosNI * (m_exponent + 2) * common;
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*eval = bsdf_phong_ramp_get_color(sc, colors, cosp) * out;
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}
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}
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}
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return LABEL_REFLECT|LABEL_GLOSSY;
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}
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CCL_NAMESPACE_END
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#endif /* __BSDF_PHONG_RAMP_H__ */
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