24 lines
790 B
GLSL
24 lines
790 B
GLSL
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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varying vec2 tex_coord;
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uniform sampler2D sampler;
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uniform vec4 search_color;
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uniform vec4 replace_color;
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uniform float epsilon;
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void main() {
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vec4 texel = texture2D(sampler, tex_coord);
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vec4 diff = clamp(abs(texel - search_color) - epsilon, 0.0, 1.0);
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float bump = max(0.0, 1.0 - ceil(diff.x + diff.y + diff.z));
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gl_FragColor = texel + bump * (replace_color - search_color);
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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