forked from bartvdbraak/blender
132 lines
4.6 KiB
C
132 lines
4.6 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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__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 = (int)npos;
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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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__device int bsdf_phong_ramp_setup(ShaderClosure *sc)
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{
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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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__device void bsdf_phong_ramp_blur(ShaderClosure *sc, float roughness)
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{
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}
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__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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__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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__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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