forked from bartvdbraak/blender
da376e0237
Cycles uses code from some great open source projects, many thanks them: * BVH building and traversal code from NVidia's "Understanding the Efficiency of Ray Traversal on GPUs": http://code.google.com/p/understanding-the-efficiency-of-ray-traversal-on-gpus/ * Open Shading Language for a large part of the shading system: http://code.google.com/p/openshadinglanguage/ * Blender for procedural textures and a few other nodes. * Approximate Catmull Clark subdivision from NVidia Mesh tools: http://code.google.com/p/nvidia-mesh-tools/ * Sobol direction vectors from: http://web.maths.unsw.edu.au/~fkuo/sobol/ * Film response functions from: http://www.cs.columbia.edu/CAVE/software/softlib/dorf.php
106 lines
3.6 KiB
C++
106 lines
3.6 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 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 BSSRDFCubicClosure : public BSSRDFClosure {
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public:
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Color3 m_radius;
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Color3 m_scale;
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float m_max_radius;
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template <typename T>
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static inline T pow3 (const T &x) { return x * x * x; }
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template <typename T>
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static inline T pow5 (const T &x) { T x2 = x * x; return x2 * x2 * x; }
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BSSRDFCubicClosure() { }
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void setup()
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{
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// pre-compute some terms
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m_max_radius = 0;
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for (int i = 0; i < 3; i++) {
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m_scale[i] = m_radius[i] > 0 ? 4 / pow5 (m_radius[i]) : 0;
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m_max_radius = std::max (m_max_radius, m_radius[i]);
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}
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}
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bool mergeable (const ClosurePrimitive *other) const {
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const BSSRDFCubicClosure *comp = (const BSSRDFCubicClosure *)other;
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return m_radius == comp->m_radius && BSSRDFClosure::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 "bssrdf_cubic"; }
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void print_on (std::ostream &out) const
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{
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out << name() << " ((" << m_radius[0] << ", " << m_radius[1] << ", " << m_radius[2] << "), ("
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<< m_scale[0] << ", " << m_scale[1] << ", " << m_scale[2] << "))";
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}
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Color3 eval (float r) const
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{
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return Color3 ((r < m_radius.x) ? pow3 (m_radius.x - r) * m_scale.x : 0,
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(r < m_radius.y) ? pow3 (m_radius.y - r) * m_scale.y : 0,
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(r < m_radius.z) ? pow3 (m_radius.z - r) * m_scale.z : 0);
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}
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float max_radius() const
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{
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return m_max_radius;
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}
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};
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ClosureParam closure_bssrdf_cubic_params[] = {
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CLOSURE_COLOR_PARAM (BSSRDFCubicClosure, m_radius),
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CLOSURE_STRING_KEYPARAM ("label"),
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CLOSURE_FINISH_PARAM(BSSRDFCubicClosure) };
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CLOSURE_PREPARE(closure_bssrdf_cubic_prepare, BSSRDFCubicClosure)
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CCL_NAMESPACE_END
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