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#version 300 es
precision mediump float;
/*
* SPDX-FileCopyrightText: syuilo and misskey-project
* SPDX-License-Identifier: AGPL-3.0-only
*/
in vec2 in_uv;
uniform sampler2D in_texture;
uniform vec2 in_resolution;
out vec4 out_color;
float getBrightness(vec4 color) {
return (color.r + color.g + color.b) / 3.0;
}
void main() {
vec4 in_color = texture(in_texture, in_uv);
float brightness = getBrightness(in_color);
out_color = vec4(brightness, brightness, brightness, in_color.a);
}
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