forked from bartvdbraak/blender
2efe0f6733
* Rename fresnel_dielectric() to fresnel_dielectric_cos() to match SVM, easier when searching code. * Also remove an old code comment in bsdf_reflection.h from Cycles branch days.
84 lines
2.9 KiB
C
84 lines
2.9 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef __BSDF_REFLECTION_H__
|
|
#define __BSDF_REFLECTION_H__
|
|
|
|
CCL_NAMESPACE_BEGIN
|
|
|
|
/* REFLECTION */
|
|
|
|
__device int bsdf_reflection_setup(ShaderClosure *sc)
|
|
{
|
|
sc->type = CLOSURE_BSDF_REFLECTION_ID;
|
|
return SD_BSDF;
|
|
}
|
|
|
|
__device void bsdf_reflection_blur(ShaderClosure *sc, float roughness)
|
|
{
|
|
}
|
|
|
|
__device float3 bsdf_reflection_eval_reflect(const ShaderClosure *sc, const float3 I, const float3 omega_in, float *pdf)
|
|
{
|
|
return make_float3(0.0f, 0.0f, 0.0f);
|
|
}
|
|
|
|
__device float3 bsdf_reflection_eval_transmit(const ShaderClosure *sc, const float3 I, const float3 omega_in, float *pdf)
|
|
{
|
|
return make_float3(0.0f, 0.0f, 0.0f);
|
|
}
|
|
|
|
__device int bsdf_reflection_sample(const ShaderClosure *sc, float3 Ng, float3 I, float3 dIdx, float3 dIdy, float randu, float randv, float3 *eval, float3 *omega_in, float3 *domega_in_dx, float3 *domega_in_dy, float *pdf)
|
|
{
|
|
float3 N = sc->N;
|
|
|
|
// only one direction is possible
|
|
float cosNO = dot(N, I);
|
|
if(cosNO > 0) {
|
|
*omega_in = (2 * cosNO) * N - I;
|
|
if(dot(Ng, *omega_in) > 0) {
|
|
#ifdef __RAY_DIFFERENTIALS__
|
|
*domega_in_dx = 2 * dot(N, dIdx) * N - dIdx;
|
|
*domega_in_dy = 2 * dot(N, dIdy) * N - dIdy;
|
|
#endif
|
|
*pdf = 1;
|
|
*eval = make_float3(1, 1, 1);
|
|
}
|
|
}
|
|
return LABEL_REFLECT|LABEL_SINGULAR;
|
|
}
|
|
|
|
CCL_NAMESPACE_END
|
|
|
|
#endif /* __BSDF_REFLECTION_H__ */
|
|
|