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/*
* Adapted from Open Shading Language with this license:
*
* Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al.
* All Rights Reserved.
*
* Modifications Copyright 2011, Blender Foundation.
*
* 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.
*/
#include <OpenImageIO/fmath.h>
#include <OSL/genclosure.h>
#include "osl_closures.h"
CCL_NAMESPACE_BEGIN
using namespace OSL;
class RefractionClosure : public BSDFClosure {
public:
Vec3 m_N; // shading normal
float m_eta; // ratio of indices of refraction (inside / outside)
RefractionClosure() : BSDFClosure(Labels::SINGULAR, Back) { }
void setup() {}
bool mergeable (const ClosurePrimitive *other) const {
const RefractionClosure *comp = (const RefractionClosure *)other;
return m_N == comp->m_N && m_eta == comp->m_eta &&
BSDFClosure::mergeable(other);
}
size_t memsize () const { return sizeof(*this); }
const char *name () const { return "refraction"; }
void print_on (std::ostream &out) const {
out << name() << " (";
out << "(" << m_N[0] << ", " << m_N[1] << ", " << m_N[2] << "), ";
out << m_eta;
out << ")";
}
Color3 eval_reflect (const Vec3 &omega_out, const Vec3 &omega_in, float& pdf) const
{
return Color3 (0, 0, 0);
}
Color3 eval_transmit (const Vec3 &omega_out, const Vec3 &omega_in, float& pdf) const
{
return Color3 (0, 0, 0);
}
float albedo (const Vec3 &omega_out) const
{
return 1.0f;
}
ustring sample (const Vec3 &Ng,
const Vec3 &omega_out, const Vec3 &domega_out_dx, const Vec3 &domega_out_dy,
float randu, float randv,
Vec3 &omega_in, Vec3 &domega_in_dx, Vec3 &domega_in_dy,
float &pdf, Color3 &eval) const
{
Vec3 R, dRdx, dRdy;
Vec3 T, dTdx, dTdy;
bool inside;
fresnel_dielectric(m_eta, m_N,
omega_out, domega_out_dx, domega_out_dy,
R, dRdx, dRdy,
T, dTdx, dTdy,
inside);
if (!inside) {
pdf = 1;
eval.setValue(1.0f, 1.0f, 1.0f);
omega_in = T;
domega_in_dx = dTdx;
domega_in_dy = dTdy;
}
return Labels::TRANSMIT;
}
};
ClosureParam bsdf_refraction_params[] = {
CLOSURE_VECTOR_PARAM(RefractionClosure, m_N),
CLOSURE_FLOAT_PARAM (RefractionClosure, m_eta),
CLOSURE_STRING_KEYPARAM("label"),
CLOSURE_FINISH_PARAM(RefractionClosure) };
CLOSURE_PREPARE(bsdf_refraction_prepare, RefractionClosure)
CCL_NAMESPACE_END
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