mirror of
https://github.com/nunuhara/xsystem4.git
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35 lines
1.0 KiB
GLSL
35 lines
1.0 KiB
GLSL
/* Copyright (C) 2022 kichikuou <KichikuouChrome@gmail.com>
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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 2 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://gnu.org/licenses/>.
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*/
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uniform vec2 center;
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uniform float start_angle;
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uniform float angle;
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uniform vec4 color;
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const float PI = 3.14159265358979323846;
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in vec2 tex_coord;
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out vec4 frag_color;
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void main() {
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vec2 p = tex_coord - center;
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float a = atan(p.y, p.x);
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a = mod(a - start_angle, 2.0 * PI);
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if (a > angle)
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discard;
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frag_color = color;
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}
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