1/* 2 Copyright (c) 2015 yvt 3 4 This file is part of OpenSpades. 5 6 OpenSpades is free software: you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation, either version 3 of the License, or 9 (at your option) any later version. 10 11 OpenSpades is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with OpenSpades. If not, see <http://www.gnu.org/licenses/>. 18 19 */ 20 21 22uniform sampler2D mainTexture; 23 24varying vec2 texCoord; 25 26void main() { 27 // linear RGB 28 vec3 color = texture2D(mainTexture, texCoord).xyz; 29 30 // desaturate 31 float brightness = max(max(color.x, color.y), color.z); 32 33 // remove NaN and Infinity 34 if (!(brightness >= 0. && brightness <= 16.)) { 35 brightness = 0.05; 36 } 37 38 // lower bound 39 brightness = max(0.05, brightness); 40 41 // uppr bound 42 brightness = min(1.3, brightness); 43 44 // raise to the n-th power to reduce overbright 45 brightness *= brightness; 46 brightness *= brightness; 47 48 gl_FragColor = vec4(brightness, brightness, brightness, 1.); 49} 50 51