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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.
*/
CCL_NAMESPACE_BEGIN
/* BACKGROUND CLOSURE */
ccl_device void background_setup(ShaderData *sd, const float3 weight)
{
if (sd->flag & SD_EMISSION) {
sd->closure_emission_background += weight;
}
else {
sd->flag |= SD_EMISSION;
sd->closure_emission_background = weight;
}
}
/* EMISSION CLOSURE */
ccl_device void emission_setup(ShaderData *sd, const float3 weight)
{
if (sd->flag & SD_EMISSION) {
sd->closure_emission_background += weight;
}
else {
sd->flag |= SD_EMISSION;
sd->closure_emission_background = weight;
}
}
/* return the probability distribution function in the direction I,
* given the parameters and the light's surface normal. This MUST match
* the PDF computed by sample(). */
ccl_device float emissive_pdf(const float3 Ng, const float3 I)
{
float cosNO = fabsf(dot(Ng, I));
return (cosNO > 0.0f) ? 1.0f : 0.0f;
}
ccl_device void emissive_sample(
const float3 Ng, float randu, float randv, float3 *omega_out, float *pdf)
{
/* todo: not implemented and used yet */
}
ccl_device float3 emissive_simple_eval(const float3 Ng, const float3 I)
{
float res = emissive_pdf(Ng, I);
return make_float3(res, res, res);
}
CCL_NAMESPACE_END
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