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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.
*/
#ifndef __BSDF_TRANSPARENT_H__
#define __BSDF_TRANSPARENT_H__
CCL_NAMESPACE_BEGIN
ccl_device void bsdf_transparent_setup(ShaderData *sd, const float3 weight, int path_flag)
{
/* Check cutoff weight. */
float sample_weight = fabsf(average(weight));
if(!(sample_weight >= CLOSURE_WEIGHT_CUTOFF)) {
return;
}
if(sd->flag & SD_TRANSPARENT) {
sd->closure_transparent_extinction += weight;
/* Add weight to existing transparent BSDF. */
for(int i = 0; i < sd->num_closure; i++) {
ShaderClosure *sc = &sd->closure[i];
if(sc->type == CLOSURE_BSDF_TRANSPARENT_ID) {
sc->weight += weight;
sc->sample_weight += sample_weight;
break;
}
}
}
else {
sd->flag |= SD_BSDF|SD_TRANSPARENT;
sd->closure_transparent_extinction = weight;
if(path_flag & PATH_RAY_TERMINATE) {
/* In this case the number of closures is set to zero to disable
* all others, but we still want to get transparency so increase
* the number just for this. */
sd->num_closure_left = 1;
}
/* Create new transparent BSDF. */
ShaderClosure *bsdf = closure_alloc(sd, sizeof(ShaderClosure), CLOSURE_BSDF_TRANSPARENT_ID, weight);
if(bsdf) {
bsdf->sample_weight = sample_weight;
bsdf->N = sd->N;
}
else if(path_flag & PATH_RAY_TERMINATE) {
sd->num_closure_left = 0;
}
}
}
ccl_device float3 bsdf_transparent_eval_reflect(const ShaderClosure *sc, const float3 I, const float3 omega_in, float *pdf)
{
return make_float3(0.0f, 0.0f, 0.0f);
}
ccl_device float3 bsdf_transparent_eval_transmit(const ShaderClosure *sc, const float3 I, const float3 omega_in, float *pdf)
{
return make_float3(0.0f, 0.0f, 0.0f);
}
ccl_device int bsdf_transparent_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)
{
// only one direction is possible
*omega_in = -I;
#ifdef __RAY_DIFFERENTIALS__
*domega_in_dx = -dIdx;
*domega_in_dy = -dIdy;
#endif
*pdf = 1;
*eval = make_float3(1, 1, 1);
return LABEL_TRANSMIT|LABEL_TRANSPARENT;
}
CCL_NAMESPACE_END
#endif /* __BSDF_TRANSPARENT_H__ */
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