Trapezoid rendering discussion with Carl Worth

Carl Worth contacted me last week about starting an implementation for the 
trapezoid primitive in the Render extension.  He has a need for 
translucent triangles and decided to take a stab at getting something 
working.

We've been cooresponding for a few days and have started refining the 
specification to try and come up with a workable implementation.  As this 
refinement will affect the specification, I asked whether it would be OK 
to forward the related messages to this list so that others might have a 
chance to see what's up.

Following this message, I'll post our discussion to date, then expect to 
see on-going discussion from that point.

Keith Packard        XFree86 Core Team        Compaq Cambridge Research Lab