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Diffstat (limited to 'intern/cycles/kernel/osl/bsdf_refraction.cpp')
-rw-r--r-- | intern/cycles/kernel/osl/bsdf_refraction.cpp | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/intern/cycles/kernel/osl/bsdf_refraction.cpp b/intern/cycles/kernel/osl/bsdf_refraction.cpp new file mode 100644 index 00000000000..3ae7a3811b4 --- /dev/null +++ b/intern/cycles/kernel/osl/bsdf_refraction.cpp @@ -0,0 +1,120 @@ +/* + * 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 + |