diff options
Diffstat (limited to 'intern/cycles/kernel/svm/svm_fresnel.h')
| -rw-r--r-- | intern/cycles/kernel/svm/svm_fresnel.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/intern/cycles/kernel/svm/svm_fresnel.h b/intern/cycles/kernel/svm/svm_fresnel.h new file mode 100644 index 00000000000..f6122fa3071 --- /dev/null +++ b/intern/cycles/kernel/svm/svm_fresnel.h @@ -0,0 +1,34 @@ +/* + * 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 + |