hackydacky opengl version of glitchlock
Shout out to cstengel for his collection of opengl samples and yoichi kobayashi for his GLSL glitch implementation.
Grab the latest version from the releases page.
$ gllock --help
Usage of gllock:
-debug
debug mode logs additional information (for instance your password)
-overlay string
specify a path to an image. it will be overlayed at the center of the screen. This image should be smaller than the screen dimensions.
-version
show version and exit