simple, then efficient rasterizer
refs: black book https://www.cs.cmu.edu/afs/cs/academic/class/15869-f11/www/readings/abrash09_lrbrast.pdf https://fgiesen.wordpress.com/2013/02/10/optimizing-the-basic-rasterizer/ https://github.com/Zielon/CPURasterizer https://github.com/vblanco20-1/Rasterizer