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91 lines
4.1 KiB
GLSL
91 lines
4.1 KiB
GLSL
/*
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* Copyright 2022-2023 GdH <G-dH@github.com>
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* Copyright 2023 elementary, Inc. <https://elementary.io>
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* SPDX-License-Identifier: GPL-3.0-or-later
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*/
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uniform sampler2D tex;
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uniform int COLORBLIND_MODE;
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uniform float STRENGTH;
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void main() {
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vec4 c = texture2D(tex, cogl_tex_coord0_in.xy);
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// RGB to LMS matrix
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float L = (17.8824f * c.r) + (43.5161f * c.g) + (4.11935f * c.b);
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float M = (3.45565f * c.r) + (27.1554f * c.g) + (3.86714f * c.b);
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float S = (0.0299566f * c.r) + (0.184309f * c.g) + (1.46709f * c.b);
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float l, m, s;
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// Remove invisible colors
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if ( COLORBLIND_MODE == 1 || COLORBLIND_MODE == 2) { // Protanopia - reds are greatly reduced
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l = 0.0f * L + 2.02344f * M + -2.52581f * S;
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m = 0.0f * L + 1.0f * M + 0.0f * S;
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s = 0.0f * L + 0.0f * M + 1.0f * S;
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} else if ( COLORBLIND_MODE == 3 || COLORBLIND_MODE == 4) { // Deuteranopia - greens are greatly reduced
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l = 1.0f * L + 0.0f * M + 0.0f * S;
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m = 0.494207f * L + 0.0f * M + 1.24827f * S;
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s = 0.0f * L + 0.0f * M + 1.0f * S;
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} else if ( COLORBLIND_MODE == 5 ) { // Tritanopia - blues are greatly reduced (1 of 10 000)
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l = 1.0f * L + 0.0f * M + 0.0f * S;
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m = 0.0f * L + 1.0f * M + 0.0f * S;
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// GdH - trinatopia vector calculated by me, all public sources were off
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s = -0.012491378299329402f * L + 0.07203451899279534f * M + 0.0f * S;
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}
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// LMS to RGB matrix conversion
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vec4 error;
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error.r = (0.0809444479f * l) + (-0.130504409f * m) + (0.116721066f * s);
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error.g = (-0.0102485335f * l) + (0.0540193266f * m) + (-0.113614708f * s);
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error.b = (-0.000365296938f * l) + (-0.00412161469f * m) + (0.693511405f * s);
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// The error is what they see
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// ratio between original and error colors allows adjusting filter for weaker forms of dichromacy
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error = error * STRENGTH + c * (1.0 - STRENGTH);
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error.a = 1.0;
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// Isolate invisible colors to color vision deficiency (calculate error matrix)
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error = (c - error);
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// Shift colors
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vec4 correction;
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// protanopia / protanomaly corrections
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if ( COLORBLIND_MODE == 1 ) {
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//(kwin effect values)
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correction.r = error.r * 0.56667 + error.g * 0.43333 + error.b * 0.00000;
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correction.g = error.r * 0.55833 + error.g * 0.44267 + error.b * 0.00000;
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correction.b = error.r * 0.00000 + error.g * 0.24167 + error.b * 0.75833;
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// tries to mimic Android, GdH
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//correction.r = error.r * -0.5 + error.g * -0.3 + error.b * 0.0;
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//correction.g = error.r * 0.2 + error.g * 0.0 + error.b * 0.0;
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//correction.b = error.r * 0.2 + error.g * 1.0 + error.b * 1.0;
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// protanopia / protanomaly high contrast G-R corrections
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} else if ( COLORBLIND_MODE == 2 ) {
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correction.r = error.r * 2.56667 + error.g * 0.43333 + error.b * 0.00000;
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correction.g = error.r * 1.55833 + error.g * 0.44267 + error.b * 0.00000;
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correction.b = error.r * 0.00000 + error.g * 0.24167 + error.b * 0.75833;
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// deuteranopia / deuteranomaly corrections (tries to mimic Android, GdH)
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} else if ( COLORBLIND_MODE == 3 ) {
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correction.r = error.r * -0.7 + error.g * 0.0 + error.b * 0.0;
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correction.g = error.r * 0.5 + error.g * 1.0 + error.b * 0.0;
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correction.b = error.r * -0.3 + error.g * 0.0 + error.b * 1.0;
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// deuteranopia / deuteranomaly high contrast R-G corrections
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} else if ( COLORBLIND_MODE == 4 ) {
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correction.r = error.r * -1.5 + error.g * 1.5 + error.b * 0.0;
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correction.g = error.r * -1.5 + error.g * 1.5 + error.b * 0.0;
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correction.b = error.r * 1.5 + error.g * 0.0 + error.b * 0.0;
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// tritanopia / tritanomaly corrections (GdH)
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} else if ( COLORBLIND_MODE == 5 ) {
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correction.r = error.r * 0.3 + error.g * 0.5 + error.b * 0.4;
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correction.g = error.r * 0.5 + error.g * 0.7 + error.b * 0.3;
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correction.b = error.r * 0.0 + error.g * 0.0 + error.b * 1.0;
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}
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// Add compensation to original values
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correction = c + correction;
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correction.a = c.a;
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cogl_color_out = correction;
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}
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