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/*
* Copyright 2011, Blender Foundation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
CCL_NAMESPACE_BEGIN
/* Fresnel Node */
__device void svm_node_fresnel(ShaderData *sd, float *stack, uint fresnel_offset, uint fresnel_value, uint out_offset)
{
float fresnel = (stack_valid(fresnel_offset))? stack_load_float(stack, fresnel_offset): __int_as_float(fresnel_value);
fresnel = fmaxf(1.0f - fresnel, 0.00001f);
float f = fresnel_dielectric_cos(dot(sd->I, sd->N), (sd->flag & SD_BACKFACING)? fresnel: 1.0f/fresnel);
stack_store_float(stack, out_offset, f);
}
CCL_NAMESPACE_END
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