[Mesa-dev] Gallium API questions

[Keith Whitwell]

> 
> We currently allow partial specification of position, requiring only
> (x, y) and filling in z as 0 and w as 1 if missing. Is that still
> valid? Similarly, colors may be specified as (r, g, b) triplets with
> no alpha, and alpha defaults to 1. Is that still valid, or are there
> changes further up the API that make this not needed?

I don't think either of those statements are true, except for the
special case that in the fragment shader *only* position.z is writeable
- ie the x,y coordinates are already fixed, and there is no meaning to
writing the position.w coordinate once you're inside the fragment
shader.

Keith