122 lines
3.8 KiB
C++
122 lines
3.8 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 2011, 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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#include <OpenImageIO/fmath.h>
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#include <OSL/genclosure.h>
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#include "osl_closures.h"
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CCL_NAMESPACE_BEGIN
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using namespace OSL;
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class RefractionClosure : public BSDFClosure {
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public:
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Vec3 m_N; // shading normal
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float m_eta; // ratio of indices of refraction (inside / outside)
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RefractionClosure() : BSDFClosure(Labels::SINGULAR, Back) {}
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void setup() {}
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bool mergeable(const ClosurePrimitive *other) const {
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const RefractionClosure *comp = (const RefractionClosure *)other;
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return m_N == comp->m_N && m_eta == comp->m_eta &&
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BSDFClosure::mergeable(other);
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}
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size_t memsize() const { return sizeof(*this); }
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const char *name() const { return "refraction"; }
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void print_on(std::ostream &out) const {
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out << name() << " (";
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out << "(" << m_N[0] << ", " << m_N[1] << ", " << m_N[2] << "), ";
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out << m_eta;
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out << ")";
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}
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Color3 eval_reflect(const Vec3 &omega_out, const Vec3 &omega_in, float& pdf) const
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{
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return Color3(0, 0, 0);
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}
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Color3 eval_transmit(const Vec3 &omega_out, const Vec3 &omega_in, float& pdf) const
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{
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return Color3(0, 0, 0);
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}
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float albedo(const Vec3 &omega_out) const
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{
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return 1.0f;
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}
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ustring sample(const Vec3 &Ng,
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const Vec3 &omega_out, const Vec3 &domega_out_dx, const Vec3 &domega_out_dy,
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float randu, float randv,
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Vec3 &omega_in, Vec3 &domega_in_dx, Vec3 &domega_in_dy,
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float &pdf, Color3 &eval) const
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{
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Vec3 R, dRdx, dRdy;
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Vec3 T, dTdx, dTdy;
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bool inside;
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fresnel_dielectric(m_eta, m_N,
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omega_out, domega_out_dx, domega_out_dy,
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R, dRdx, dRdy,
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T, dTdx, dTdy,
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inside);
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if (!inside) {
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pdf = 1;
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eval.setValue(1.0f, 1.0f, 1.0f);
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omega_in = T;
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domega_in_dx = dTdx;
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domega_in_dy = dTdy;
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}
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return Labels::TRANSMIT;
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}
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};
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ClosureParam bsdf_refraction_params[] = {
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CLOSURE_VECTOR_PARAM(RefractionClosure, m_N),
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CLOSURE_FLOAT_PARAM(RefractionClosure, m_eta),
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CLOSURE_STRING_KEYPARAM("label"),
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CLOSURE_FINISH_PARAM(RefractionClosure)
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};
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CLOSURE_PREPARE(bsdf_refraction_prepare, RefractionClosure)
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CCL_NAMESPACE_END
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