62 lines
1.8 KiB
GLSL
62 lines
1.8 KiB
GLSL
/*
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* cmap_simple.glsl
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*
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* Color mapping shader - Nearest/Bilinear version
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*
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* Copyright (C) 2013-2014 Sylvain Munaut
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Note (to make it clear): for the purpose of this license, any software
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* making use of this shader (or derivative thereof) is considered to be
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* a derivative work (i.e. "a work based on the program").
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*/
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/* Require GLSL 1.5 compatibility profile to build without warning
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* But we use 1.3 since some cards don't allow 1.5 compatibility but
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* will work with 1.3
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*/
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/* #version 150 compatibility */
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#version 130
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/* ------------------------------------------------------------------------ */
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/* Main fragment shader code */
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/* ------------------------------------------------------------------------ */
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/* Uniforms */
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uniform sampler1D palette; /* 1D texture with the color to map to */
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uniform sampler2D tex; /* 2D intensity texture */
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uniform vec2 range; /* (scale, offset) vector */
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/* In/Out */
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out vec4 out_FragColor;
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/* Shader main */
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void main()
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{
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float intensity = texture(tex, gl_TexCoord[0].st).x;
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float map = (intensity + range.y) * range.x;
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vec4 color = texture(palette, map);
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out_FragColor = color;
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}
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/* vim: set syntax=c: */
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