diff options
Diffstat (limited to 'intern/cycles/kernel/shaders/node_brightness.osl')
| -rw-r--r-- | intern/cycles/kernel/shaders/node_brightness.osl | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/intern/cycles/kernel/shaders/node_brightness.osl b/intern/cycles/kernel/shaders/node_brightness.osl new file mode 100644 index 00000000000..8e9f5c9c796 --- /dev/null +++ b/intern/cycles/kernel/shaders/node_brightness.osl @@ -0,0 +1,51 @@ +/* + * 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" + +shader node_brightness( + color ColorIn = color(0.8, 0.8, 0.8), + float Brightness = 0.0, + float Contrast = 0.0, + output color ColorOut = color(0.8, 0.8, 0.8)) +{ + float delta = Contrast * (1.0 / 200.0); + float a = 1.0 - delta * 2.0; + float b; + + /* input value is a percentage */ + float bright_factor = Brightness / 100.0; + + /* + * The algorithm is by Werner D. Streidt + * (http://visca.com/ffactory/archives/5-99/msg00021.html) + * Extracted of OpenCV demhist.c + */ + + if (Contrast > 0.0) { + a = (a < 0.0 ? 1.0 / a : 0.0); + b = a * (bright_factor - delta); + } + else { + delta *= -1.0; + b = a * (bright_factor + delta); + } + + ColorOut = a * ColorIn + b; +} + |