2
* Adapted from Open Shading Language with this license:
4
* Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al.
7
* Modifications Copyright 2011, Blender Foundation.
9
* Redistribution and use in source and binary forms, with or without
10
* modification, are permitted provided that the following conditions are
12
* * Redistributions of source code must retain the above copyright
13
* notice, this list of conditions and the following disclaimer.
14
* * Redistributions in binary form must reproduce the above copyright
15
* notice, this list of conditions and the following disclaimer in the
16
* documentation and/or other materials provided with the distribution.
17
* * Neither the name of Sony Pictures Imageworks nor the names of its
18
* contributors may be used to endorse or promote products derived from
19
* this software without specific prior written permission.
20
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33
#include <OpenImageIO/fmath.h>
35
#include <OSL/genclosure.h>
37
#include "osl_closures.h"
43
class ReflectionClosure : public BSDFClosure {
45
Vec3 m_N; // shading normal
46
ReflectionClosure() : BSDFClosure(Labels::SINGULAR) { }
50
bool mergeable (const ClosurePrimitive *other) const {
51
const ReflectionClosure *comp = (const ReflectionClosure *)other;
52
return m_N == comp->m_N && BSDFClosure::mergeable(other);
55
size_t memsize () const { return sizeof(*this); }
57
const char *name () const { return "reflection"; }
59
void print_on (std::ostream &out) const {
60
out << name() << " (";
61
out << "(" << m_N[0] << ", " << m_N[1] << ", " << m_N[2] << "))";
64
float albedo (const Vec3 &omega_out) const
69
Color3 eval_reflect (const Vec3 &omega_out, const Vec3 &omega_in, float& pdf) const
71
return Color3 (0, 0, 0);
74
Color3 eval_transmit (const Vec3 &omega_out, const Vec3 &omega_in, float& pdf) const
76
return Color3 (0, 0, 0);
79
ustring sample (const Vec3 &Ng,
80
const Vec3 &omega_out, const Vec3 &domega_out_dx, const Vec3 &domega_out_dy,
81
float randu, float randv,
82
Vec3 &omega_in, Vec3 &domega_in_dx, Vec3 &domega_in_dy,
83
float &pdf, Color3 &eval) const
85
// only one direction is possible
86
float cosNO = m_N.dot(omega_out);
88
omega_in = (2 * cosNO) * m_N - omega_out;
89
if (Ng.dot(omega_in) > 0) {
90
domega_in_dx = 2 * m_N.dot(domega_out_dx) * m_N - domega_out_dx;
91
domega_in_dy = 2 * m_N.dot(domega_out_dy) * m_N - domega_out_dy;
93
eval.setValue(1, 1, 1);
96
return Labels::REFLECT;
100
ClosureParam bsdf_reflection_params[] = {
101
CLOSURE_VECTOR_PARAM(ReflectionClosure, m_N),
102
CLOSURE_STRING_KEYPARAM("label"),
103
CLOSURE_FINISH_PARAM(ReflectionClosure) };
105
CLOSURE_PREPARE(bsdf_reflection_prepare, ReflectionClosure)