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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
/* REFRACTION */
ccl_device int bsdf_refraction_setup(ccl_private MicrofacetBsdf *bsdf)
{
bsdf->type = CLOSURE_BSDF_REFRACTION_ID;
return SD_BSDF;
}
ccl_device Spectrum bsdf_refraction_eval_reflect(ccl_private const ShaderClosure *sc,
const float3 I,
const float3 omega_in,
ccl_private float *pdf)
{
*pdf = 0.0f;
return zero_spectrum();
}
ccl_device Spectrum bsdf_refraction_eval_transmit(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_refraction_sample(ccl_private const ShaderClosure *sc,
float3 Ng,
float3 I,
float3 dIdx,
float3 dIdy,
float randu,
float randv,
ccl_private Spectrum *eval,
ccl_private float3 *omega_in,
ccl_private float3 *domega_in_dx,
ccl_private float3 *domega_in_dy,
ccl_private float *pdf)
{
ccl_private const MicrofacetBsdf *bsdf = (ccl_private const MicrofacetBsdf *)sc;
float m_eta = bsdf->ior;
float3 N = bsdf->N;
float3 R, T;
#ifdef __RAY_DIFFERENTIALS__
float3 dRdx, dRdy, dTdx, dTdy;
#endif
bool inside;
float fresnel;
fresnel = fresnel_dielectric(m_eta,
N,
I,
&R,
&T,
#ifdef __RAY_DIFFERENTIALS__
dIdx,
dIdy,
&dRdx,
&dRdy,
&dTdx,
&dTdy,
#endif
&inside);
if (!inside && fresnel != 1.0f) {
/* Some high number for MIS. */
*pdf = 1e6f;
*eval = make_spectrum(1e6f);
*omega_in = T;
#ifdef __RAY_DIFFERENTIALS__
*domega_in_dx = dTdx;
*domega_in_dy = dTdy;
#endif
}
else {
*pdf = 0.0f;
*eval = zero_spectrum();
}
return LABEL_TRANSMIT | LABEL_SINGULAR;
}
CCL_NAMESPACE_END
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