A hardware-accelerated recirculating programmable texture blender/shader arrangement circulates computed color and alpha data over multiple texture blending/shading cycles (stages) to provide multi-texturing and other effects. Up to sixteen independently programmable consecutive stages, forming a chain...http://www.google.fr/patents/US7034828?utm_source=gb-gplus-shareBrevet US7034828 - Recirculating shade tree blender for a graphics system
Recirculating shade tree blender for a graphics system