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diff --git a/compute.glsl b/compute.glsl
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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/>.
+ */
+
+#version 310 es
+
+precision mediump image2D;
+
+layout(local_size_x = 2, local_size_y = 2) in;
+layout(rgba8, binding = 0) uniform restrict readonly image2D img_rgba;
+layout(rgba8, binding = 1) uniform restrict writeonly image2D img_luma;
+layout(rgba8, binding = 2) uniform restrict writeonly image2D img_chroma;
+layout(location = 0) uniform mat3 colorspace;
+layout(location = 1) uniform vec2 ranges[2];
+
+void main(void) {
+}