29 lines
1007 B
Plaintext
29 lines
1007 B
Plaintext
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// pathfinder/resources/shaders/post_gamma_correct.inc.glsl
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//
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// Copyright © 2019 The Pathfinder Project Developers.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// The lookup table for gamma correction, in the same format WebRender
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// expects.
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uniform sampler2D uGammaLUT;
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// The background color to blend against. Zero if no gamma correction is to be
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// performed.
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uniform vec4 uGammaCorrectionBGColor;
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float gammaCorrectChannel(float fgColor) {
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return texture(uGammaLUT, vec2(fgColor, 1.0 - uGammaCorrectionBGColor)).r;
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}
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// `fgColor` is in linear space.
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vec3 gammaCorrect(vec3 fgColor) {
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return vec3(gammaCorrectChannel(fgColor.r),
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gammaCorrectChannel(fgColor.g),
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gammaCorrectChannel(fgColor.b));
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}
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