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/* SPDX-License-Identifier: BSD-3-Clause
*
* Adapted from Open Shading Language
* Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al.
* All Rights Reserved.
*
* Modifications Copyright 2011-2022 Blender Foundation. */
#pragma once
CCL_NAMESPACE_BEGIN
/* BACKGROUND CLOSURE */
ccl_device void background_setup(ccl_private 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(ccl_private 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,
ccl_private float3 *omega_out,
ccl_private 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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