Keith Whitwell wrote:
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.
I believe Corbin was referring to incoming vertex data in the case of
glVertex2f and glColor3f, for example.
I need to update the docs with fragment shader z-write...
-Brian
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