blender/intern/cycles/kernel/shaders/node_brightness.osl

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/*
* Copyright 2011-2013 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License
*/
#include "stdosl.h"
shader node_brightness(
color ColorIn = 0.8,
float Bright = 0.0,
float Contrast = 0.0,
output color ColorOut = 0.8)
{
float a = 1.0 + Contrast;
float b = Bright - Contrast * 0.5;
ColorOut[0] = max(a * ColorIn[0] + b, 0.0);
ColorOut[1] = max(a * ColorIn[1] + b, 0.0);
ColorOut[2] = max(a * ColorIn[2] + b, 0.0);
}