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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 BSSRDFCubicClosure : public BSSRDFClosure {
public:
Color3 m_radius;
Color3 m_scale;
float m_max_radius;
template <typename T>
static inline T pow3 (const T &x) { return x * x * x; }
template <typename T>
static inline T pow5 (const T &x) { T x2 = x * x; return x2 * x2 * x; }
BSSRDFCubicClosure() { }
void setup()
{
// pre-compute some terms
m_max_radius = 0;
for (int i = 0; i < 3; i++) {
m_scale[i] = m_radius[i] > 0 ? 4 / pow5 (m_radius[i]) : 0;
m_max_radius = std::max (m_max_radius, m_radius[i]);
}
}
bool mergeable (const ClosurePrimitive *other) const {
const BSSRDFCubicClosure *comp = (const BSSRDFCubicClosure *)other;
return m_radius == comp->m_radius && BSSRDFClosure::mergeable(other);
}
size_t memsize () const { return sizeof(*this); }
const char *name () const { return "bssrdf_cubic"; }
void print_on (std::ostream &out) const
{
out << name() << " ((" << m_radius[0] << ", " << m_radius[1] << ", " << m_radius[2] << "), ("
<< m_scale[0] << ", " << m_scale[1] << ", " << m_scale[2] << "))";
}
Color3 eval (float r) const
{
return Color3 ((r < m_radius.x) ? pow3 (m_radius.x - r) * m_scale.x : 0,
(r < m_radius.y) ? pow3 (m_radius.y - r) * m_scale.y : 0,
(r < m_radius.z) ? pow3 (m_radius.z - r) * m_scale.z : 0);
}
float max_radius() const
{
return m_max_radius;
}
};
ClosureParam closure_bssrdf_cubic_params[] = {
CLOSURE_COLOR_PARAM (BSSRDFCubicClosure, m_radius),
CLOSURE_STRING_KEYPARAM ("label"),
CLOSURE_FINISH_PARAM(BSSRDFCubicClosure) };
CLOSURE_PREPARE(closure_bssrdf_cubic_prepare, BSSRDFCubicClosure)
CCL_NAMESPACE_END
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