From 782260833e551dc02a2df2e2ad2a266e7bb51f38 Mon Sep 17 00:00:00 2001
From: Daniele Pintore <daniele.pintore1@gmail.com>
Date: Wed, 4 Dec 2024 22:03:43 +0100
Subject: [PATCH] Add grayscale filter

---
 .config/hypr/hyprland.conf          |  2 ++
 .config/hypr/shaders/grayscale.frag | 33 +++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)
 create mode 100644 .config/hypr/shaders/grayscale.frag

diff --git a/.config/hypr/hyprland.conf b/.config/hypr/hyprland.conf
index c050e4a..ecaf517 100644
--- a/.config/hypr/hyprland.conf
+++ b/.config/hypr/hyprland.conf
@@ -69,6 +69,8 @@ general {
 decoration {
     # See https://wiki.hyprland.org/Configuring/Variables/ for more
 
+		screen_shader = /home/daniele/.config/hypr/shaders/grayscale.frag
+
     rounding = 5
     
     blur {
diff --git a/.config/hypr/shaders/grayscale.frag b/.config/hypr/shaders/grayscale.frag
new file mode 100644
index 0000000..776c25c
--- /dev/null
+++ b/.config/hypr/shaders/grayscale.frag
@@ -0,0 +1,33 @@
+//
+// Example blue light filter shader.
+// 
+
+//precision mediump float;
+//varying vec2 v_texcoord;
+//uniform sampler2D tex;
+//
+//void main() {
+//
+//    vec4 pixColor = texture2D(tex, v_texcoord);
+//
+//    pixColor[2] *= 0.;
+//
+//    gl_FragColor = pixColor;
+//}
+// Example grayscale shader.
+
+precision mediump float; // Set the precision for floating-point calculations.
+varying vec2 v_texcoord; // Varying texture coordinate passed from the vertex shader.
+uniform sampler2D tex;   // The texture sampler.
+
+void main() {
+    // Sample the texture at the given coordinates.
+    vec4 pixColor = texture2D(tex, v_texcoord);
+
+    // Compute the grayscale value using standard luminance weights.
+    float gray = 0.299 * pixColor.r + 0.587 * pixColor.g + 0.114 * pixColor.b;
+
+    // Set the fragment color to the grayscale value, keeping the original alpha.
+    gl_FragColor = vec4(vec3(gray), pixColor.a);
+}
+