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20 lines
612 B
GLSL
20 lines
612 B
GLSL
/*
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* Copyright 2023 elementary, Inc. <https://elementary.io>
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* SPDX-License-Identifier: GPL-3.0-or-later
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*/
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uniform sampler2D tex;
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uniform float STRENGTH;
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void main() {
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vec2 uv = cogl_tex_coord0_in.xy;
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vec4 sample = texture2D (tex, uv);
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vec3 luminance = vec3 (0.2126, 0.7512, 0.0722);
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float gray = luminance.r * sample.r + luminance.g * sample.g + luminance.b * sample.b;
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cogl_color_out = vec4 (
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sample.r * (1.0 - STRENGTH) + gray * STRENGTH,
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sample.g * (1.0 - STRENGTH) + gray * STRENGTH,
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sample.b * (1.0 - STRENGTH) + gray * STRENGTH,
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sample.a
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) ;
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}
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