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/*
* Copyright (C) 2023 Mikhail Burakov. This file is part of streamer.
*
* streamer is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* streamer is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with streamer. If not, see <https://www.gnu.org/licenses/>.
*/
uniform sampler2D img_input;
uniform mediump vec2 sample_offsets[4];
varying mediump vec2 texcoord;
const mediump mat3 kColorSpace = mat3(
0.299, 0.587, 0.114,
-0.168736, -0.331264, 0.5,
0.5, -0.418688, -0.081312
);
const mediump vec3 kColorRangeBase = vec3(
16.0 / 255.0,
16.0 / 255.0,
16.0 / 255.0
);
const mediump vec3 kColorRangeScale = vec3(
(235.0 - 16.0) / 255.0,
(240.0 - 16.0) / 255.0,
(240.0 - 16.0) / 255.0
);
mediump vec4 supersample() {
return texture2D(img_input, texcoord + sample_offsets[0]) +
texture2D(img_input, texcoord + sample_offsets[1]) +
texture2D(img_input, texcoord + sample_offsets[2]) +
texture2D(img_input, texcoord + sample_offsets[3]);
}
mediump vec3 rgb2yuv(in mediump vec3 rgb) {
mediump vec3 yuv = kColorSpace * rgb.rgb + vec3(0.0, 0.5, 0.5);
return kColorRangeBase + yuv * kColorRangeScale;
}
void main() {
mediump vec4 rgb = supersample() / 4.0;
mediump vec3 yuv = rgb2yuv(rgb.rgb);
gl_FragColor = vec4(yuv.yz, 0.0, 1.0);
}
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