diff options
Diffstat (limited to 'intern/cycles/kernel/shaders/node_rgb_curves.osl')
-rw-r--r-- | intern/cycles/kernel/shaders/node_rgb_curves.osl | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/intern/cycles/kernel/shaders/node_rgb_curves.osl b/intern/cycles/kernel/shaders/node_rgb_curves.osl new file mode 100644 index 00000000000..362bae8a750 --- /dev/null +++ b/intern/cycles/kernel/shaders/node_rgb_curves.osl @@ -0,0 +1,53 @@ +/* + * 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. + */ + +#include "stdosl.h" +#include "oslutil.h" + +float ramp_lookup(color ramp[RAMP_TABLE_SIZE], float at, int component) +{ + float f = clamp(at, 0.0, 1.0) * (RAMP_TABLE_SIZE - 1); + + /* clamp int as well in case of NaN */ + int i = (int)f; + if (i < 0) i = 0; + if (i >= RAMP_TABLE_SIZE) i = RAMP_TABLE_SIZE - 1; + float t = f - (float)i; + + float result = ramp[i][component]; + + if (t > 0.0) + result = (1.0 - t) * result + t * ramp[i + 1][component]; + + return result; +} + +shader node_rgb_curves( + color ramp[RAMP_TABLE_SIZE] = {0.0}, + + color ColorIn = 0.0, + float Fac = 0.0, + output color ColorOut = 0.0) +{ + ColorOut[0] = ramp_lookup(ramp, ColorIn[0], 0); + ColorOut[1] = ramp_lookup(ramp, ColorIn[1], 1); + ColorOut[2] = ramp_lookup(ramp, ColorIn[2], 2); + + ColorOut = mix(ColorIn, ColorOut, Fac); +} + |