[Mesa-dev] Gallium API questions
Keith Whitwell
keithw at vmware.com
Thu Jun 24 05:04:19 PDT 2010
>
> 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
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