A gif generator coded in javascript & glsl.
The text is created with a hidden <canvas> element. It is then stored in a texture and color coded by the text position (top = r / middle = g / bottom=b). This texture is used to create nice text effects.
Try them: https://antoinemopa.github.io/80sgifgenerator/
Start with shadergif http://a-mo-pa.com/stuff/shadergif/