From ca16a2b186f7c96785e63b0186c2df47de4b2767 Mon Sep 17 00:00:00 2001
From: Aly Raffauf <alyraffauf@gmail.com>
Date: Mon, 25 Mar 2024 01:05:57 -0400
Subject: [PATCH] hyprland: add hyprshade config

---
 home/hypr/blue-light-filter.glsl | 43 ++++++++++++++++++++++++++++++++
 home/hypr/hypershade.toml        |  4 +++
 home/hypr/hyprland.conf          |  4 +--
 3 files changed, 49 insertions(+), 2 deletions(-)
 create mode 100644 home/hypr/blue-light-filter.glsl
 create mode 100644 home/hypr/hypershade.toml

diff --git a/home/hypr/blue-light-filter.glsl b/home/hypr/blue-light-filter.glsl
new file mode 100644
index 00000000..41d0f822
--- /dev/null
+++ b/home/hypr/blue-light-filter.glsl
@@ -0,0 +1,43 @@
+// from https://github.com/hyprwm/Hyprland/issues/1140#issuecomment-1335128437
+
+precision highp float;
+varying vec2 v_texcoord;
+uniform sampler2D tex;
+
+const float temperature = 4500.0;
+const float temperatureStrength = 1.0;
+
+#define WithQuickAndDirtyLuminancePreservation
+const float LuminancePreservationFactor = 1.0;
+
+// function from https://www.shadertoy.com/view/4sc3D7
+// valid from 1000 to 40000 K (and additionally 0 for pure full white)
+vec3 colorTemperatureToRGB(const in float temperature) {
+    // values from: http://blenderartists.org/forum/showthread.php?270332-OSL-Goodness&p=2268693&viewfull=1#post2268693
+    mat3 m = (temperature <= 6500.0) ? mat3(vec3(0.0, -2902.1955373783176, -8257.7997278925690),
+                                            vec3(0.0, 1669.5803561666639, 2575.2827530017594),
+                                            vec3(1.0, 1.3302673723350029, 1.8993753891711275))
+                                     : mat3(vec3(1745.0425298314172, 1216.6168361476490, -8257.7997278925690),
+                                            vec3(-2666.3474220535695, -2173.1012343082230, 2575.2827530017594),
+                                            vec3(0.55995389139931482, 0.70381203140554553, 1.8993753891711275));
+    return mix(clamp(vec3(m[0] / (vec3(clamp(temperature, 1000.0, 40000.0)) + m[1]) + m[2]), vec3(0.0), vec3(1.0)),
+               vec3(1.0), smoothstep(1000.0, 0.0, temperature));
+}
+
+void main() {
+    vec4 pixColor = texture2D(tex, v_texcoord);
+
+    // RGB
+    vec3 color = vec3(pixColor[0], pixColor[1], pixColor[2]);
+
+#ifdef WithQuickAndDirtyLuminancePreservation
+    color *= mix(1.0, dot(color, vec3(0.2126, 0.7152, 0.0722)) / max(dot(color, vec3(0.2126, 0.7152, 0.0722)), 1e-5),
+                 LuminancePreservationFactor);
+#endif
+
+    color = mix(color, color * colorTemperatureToRGB(temperature), temperatureStrength);
+
+    vec4 outCol = vec4(color, pixColor[3]);
+
+    gl_FragColor = outCol;
+}
diff --git a/home/hypr/hypershade.toml b/home/hypr/hypershade.toml
new file mode 100644
index 00000000..7be1620b
--- /dev/null
+++ b/home/hypr/hypershade.toml
@@ -0,0 +1,4 @@
+[[shades]]
+name = "blue-light-filter"
+start_time = 19:00:00
+end_time = 06:00:00   # optional if you have more than one shade with start_time
diff --git a/home/hypr/hyprland.conf b/home/hypr/hyprland.conf
index 63303065..b5286fa0 100644
--- a/home/hypr/hyprland.conf
+++ b/home/hypr/hyprland.conf
@@ -23,13 +23,13 @@ env = GDK_SCALE,1.5
 # See https://wiki.hyprland.org/Configuring/Keywords/ for more
 
 # Execute your favorite apps at launch
+exec-once = dbus-update-activation-environment --systemd HYPRLAND_INSTANCE_SIGNATURE
+exec-once = hyprshade auto
 exec-once = hyprpaper
 exec-once = hypridle
 exec-once = waybar
 exec-once = mako
 
-#exec-once = dbus-update-activation-environment --systemd HYPRLAND_INSTANCE_SIGNATURE
-
 # Source a file (multi-file configs)
 # source = ~/.config/hypr/myColors.conf