barbiefan
commented
1 year ago fancy pants transparency, adds transparency depending on the color/brightness/etc of the window
I wanted that feature so bad, so I wrote a little shader, so I'll put it here, so other people could find it:
#version 330
in vec2 texcoord;
uniform sampler2D tex;
const float min_alpha = 0.8;
const float upper_bound = 0.18;
vec4 default_post_processing(vec4 c);
vec4 window_shader() {
vec2 texsize = textureSize(tex, 0);
vec4 color = texture2D(tex, texcoord / texsize, 0);
float pixel_brightness = (color.r + color.g + color.b) / 3;
color.a = mix(min_alpha, 1, pixel_brightness / upper_bound);
return default_post_processing(color);
}
the transparency depends on the "brightness" of the pixel (average of r,g,b)
it then interpolates between min_alpha and 1 to set the alpha of the pixel based on it's brightness
upper_bound is value of brightness that should be of alpha 1.0, anything higher too
and a little caveat - I need to set a black background with feh (just a 1 black pixel image) before I set wallpaper with anything else (like wal, xwinwrap+mpv, nitrogen etc). xsetroot -solid "#000000" does not work, and feh --bg-fill leaks some buffer with bits of your screen.
feh --bg-max "$HOME/.bins/black_dot.png"HOWEVER - this really doesn't play nicely with content like videos or photos. A lot of dark areas on them will leak your wallpaper
quantenzitrone
wyatt8740
absolutelynothelix
problem description
the current interface for the glsl shaders doesn't provide enough features using
window-shader-fg-rules, we can use more interface, but for n shader effects depending on n window properties in a boolean way, we need 2^n shaders to apply the rules. for example:shader effect 1:
shader effect 2:
result: 4 shaders with a lot of redundancy:
proposed additions
uniform bool fullscreen;uniform bool focused;probably also any other bool, int or float property could be useful to some peopleby adding everything possible, the number of needed shaders could be reduced to a minimum
alternatives
adding functionality to pass any conditions as bool to shaders
or
be able to stack shaders (one shader per shader effect)
or
using
window-shader-fg-rulesdisadvantages see problem description