Hyprland Night Light Filter

For NVIDIA gpus, you cannot use gammastep. You must apply a hyprland red filter to save your eyes.

1. Create a file ~/.config/hypr/shaders/nightlight.frag
2. Write the following to the file:

//
// 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] *= 0.8;
 
    gl_FragColor = pixColor;
}

3. Edit ~/.config/hypr/hyprland.conf and write:

decoration {
	... // whatever was here before
	screen_shader = ~/.config/hypr/shaders/nightlight.frag
}

Alternate Fix for OpenGL 300

#version 300 es
//
// Blue light filter shader for Hyprland
// 
precision mediump float;
 
in vec2 v_texcoord;
 
out vec4 fragColor;
 
uniform sampler2D tex;
 
void main() {
    vec4 pixColor = texture(tex, v_texcoord);
    
    // Reduce blue component
    pixColor.b *= 0.85;
    
    // Slightly reduce alpha
    pixColor.a *= 0.9;
    
    fragColor = pixColor;
}