An FFGL source and a matching mask effect for Resolume. Shapes slide in from whichever edge you choose, stop a set distance in, bank up behind one another (overlapping, newest on top) and get drawn away off the far side. You can set the spacing in multiples of the shape's own thickness, or in absolute pixels for a pixel map.
This demo runs the plugin's shaders in your browser, so it needs JavaScript and WebGL2. The plugin itself, its source and its downloads are on its project page.