1 files changed, 25 insertions, 0 deletions
diff --git a/client/gui/resources/shaders/grayscale.gdshader b/client/gui/resources/shaders/grayscale.gdshader
new file mode 100644
index 00000000..c058e7bf
--- /dev/null
+++ b/client/gui/resources/shaders/grayscale.gdshader
@@ -0,0 +1,25 @@
+/*
+    Hurry Curry! - a game about cooking
+    Copyright (C) 2025 Hurry Curry! Contributors
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, version 3 of the License only.
+
+    This program 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+*/
+shader_type canvas_item;
+
+void fragment() {
+    float brightness = 0.2126 * COLOR.r + 0.7152 * COLOR.g + 0.0722 * COLOR.b;
+    brightness = (brightness - .5) * 2.;
+    COLOR.rgb = vec3(brightness);
+    COLOR.a *= 1. - brightness;
+}