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https://github.com/MaurycyLiebner/enve.git
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42 lines
1.3 KiB
GLSL
42 lines
1.3 KiB
GLSL
// enve - 2D animations software
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// Copyright (C) 2016-2020 Maurycy Liebner
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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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// 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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// 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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#version 330 core
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layout(location = 0) out vec4 fragColor;
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in vec2 texCoord;
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uniform sampler2D texture;
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uniform float sharpness;
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uniform float time;
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void main(void) {
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float width = 2 - sharpness;
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float margin = 0.5*(width - 1);
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float x0 = width * (1 - time) - margin;
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float x1 = x0 + 1 - sharpness;
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float alpha;
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float fragX = texCoord.x + 0.5*(1 - sharpness);
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if(fragX < x0) {
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alpha = 1;
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} else if(fragX > x1) {
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alpha = 0;
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} else {
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alpha = 0.5*(cos(3.14159*(fragX - x0)/(1 - sharpness)) + 1);
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}
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fragColor = texture2D(texture, texCoord) * alpha;
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} |