diff options
Diffstat (limited to 'intern/cycles/kernel/osl/bsdf_diffuse.cpp')
| -rw-r--r-- | intern/cycles/kernel/osl/bsdf_diffuse.cpp | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/intern/cycles/kernel/osl/bsdf_diffuse.cpp b/intern/cycles/kernel/osl/bsdf_diffuse.cpp new file mode 100644 index 00000000000..0d4b3fa471f --- /dev/null +++ b/intern/cycles/kernel/osl/bsdf_diffuse.cpp @@ -0,0 +1,181 @@ +/* + * 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 DiffuseClosure : public BSDFClosure { +public: + Vec3 m_N; + + DiffuseClosure() : BSDFClosure(Labels::DIFFUSE) { } + + void setup() {}; + + bool mergeable (const ClosurePrimitive *other) const { + const DiffuseClosure *comp = (const DiffuseClosure *)other; + return m_N == comp->m_N && BSDFClosure::mergeable(other); + } + + size_t memsize () const { return sizeof(*this); } + + const char *name () const { return "diffuse"; } + + void print_on (std::ostream &out) const + { + out << name() << " ((" << m_N[0] << ", " << m_N[1] << ", " << m_N[2] << "))"; + } + + float albedo (const Vec3 &omega_out) const + { + return 1.0f; + } + + Color3 eval_reflect (const Vec3 &omega_out, const Vec3 &omega_in, float& pdf) const + { + float cos_pi = std::max(m_N.dot(omega_in),0.0f) * (float) M_1_PI; + pdf = cos_pi; + return Color3 (cos_pi, cos_pi, cos_pi); + } + + Color3 eval_transmit (const Vec3 &omega_out, const Vec3 &omega_in, float& pdf) const + { + return Color3 (0, 0, 0); + } + + 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 + { + // we are viewing the surface from the right side - send a ray out with cosine + // distribution over the hemisphere + sample_cos_hemisphere (m_N, omega_out, randu, randv, omega_in, pdf); + if (Ng.dot(omega_in) > 0) { + eval.setValue(pdf, pdf, pdf); + // TODO: find a better approximation for the diffuse bounce + domega_in_dx = (2 * m_N.dot(domega_out_dx)) * m_N - domega_out_dx; + domega_in_dy = (2 * m_N.dot(domega_out_dy)) * m_N - domega_out_dy; + domega_in_dx *= 125; + domega_in_dy *= 125; + } else + pdf = 0; + return Labels::REFLECT; + } +}; + + + +class TranslucentClosure : public BSDFClosure { +public: + Vec3 m_N; + + TranslucentClosure() : BSDFClosure(Labels::DIFFUSE, Back) { } + + void setup() {}; + + bool mergeable (const ClosurePrimitive *other) const { + const TranslucentClosure *comp = (const TranslucentClosure *)other; + return m_N == comp->m_N && BSDFClosure::mergeable(other); + } + + size_t memsize () const { return sizeof(*this); } + + const char *name () const { return "translucent"; } + + void print_on (std::ostream &out) const + { + out << name() << " ((" << m_N[0] << ", " << m_N[1] << ", " << m_N[2] << "))"; + } + + Color3 eval_reflect (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; + } + + Color3 eval_transmit (const Vec3 &omega_out, const Vec3 &omega_in, float& pdf) const + { + float cos_pi = std::max(-m_N.dot(omega_in), 0.0f) * (float) M_1_PI; + pdf = cos_pi; + return Color3 (cos_pi, cos_pi, cos_pi); + } + + 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 + { + // we are viewing the surface from the right side - send a ray out with cosine + // distribution over the hemisphere + sample_cos_hemisphere (-m_N, omega_out, randu, randv, omega_in, pdf); + if (Ng.dot(omega_in) < 0) { + eval.setValue(pdf, pdf, pdf); + // TODO: find a better approximation for the diffuse bounce + domega_in_dx = (2 * m_N.dot(domega_out_dx)) * m_N - domega_out_dx; + domega_in_dy = (2 * m_N.dot(domega_out_dy)) * m_N - domega_out_dy; + domega_in_dx *= -125; + domega_in_dy *= -125; + } else + pdf = 0; + return Labels::TRANSMIT; + } +}; + +ClosureParam bsdf_diffuse_params[] = { + CLOSURE_VECTOR_PARAM (DiffuseClosure, m_N), + CLOSURE_STRING_KEYPARAM("label"), + CLOSURE_FINISH_PARAM (DiffuseClosure) }; + +ClosureParam bsdf_translucent_params[] = { + CLOSURE_VECTOR_PARAM (TranslucentClosure, m_N), + CLOSURE_STRING_KEYPARAM("label"), + CLOSURE_FINISH_PARAM (TranslucentClosure) }; + +CLOSURE_PREPARE(bsdf_diffuse_prepare, DiffuseClosure) +CLOSURE_PREPARE(bsdf_translucent_prepare, TranslucentClosure) + +CCL_NAMESPACE_END + |