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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
/* REFLECTION */
ccl_device int bsdf_reflection_setup(ccl_private MicrofacetBsdf *bsdf)
{
bsdf->type = CLOSURE_BSDF_REFLECTION_ID;
return SD_BSDF;
}
ccl_device Spectrum bsdf_reflection_eval(ccl_private const ShaderClosure *sc,
const float3 I,
const float3 omega_in,
ccl_private float *pdf)
{
*pdf = 0.0f;
return zero_spectrum();
}
ccl_device int bsdf_reflection_sample(ccl_private const ShaderClosure *sc,
float3 Ng,
float3 I,
float randu,
float randv,
ccl_private Spectrum *eval,
ccl_private float3 *omega_in,
ccl_private float *pdf,
ccl_private float *eta)
{
ccl_private const MicrofacetBsdf *bsdf = (ccl_private const MicrofacetBsdf *)sc;
float3 N = bsdf->N;
*eta = bsdf->ior;
// 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) {
/* Some high number for MIS. */
*pdf = 1e6f;
*eval = make_spectrum(1e6f);
}
}
else {
*pdf = 0.0f;
*eval = zero_spectrum();
}
return LABEL_REFLECT | LABEL_SINGULAR;
}
CCL_NAMESPACE_END
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