i965: Be more clever about setting up our viewport clip

Before, we were trusting in the hardware to take the intersection
of the viewport clip with the drawing rectangle.  Unfortunately,
3DSTATE_DRAWING_RECTANGLE is fairly expensive because it implicitly
does a full pipeline stall.  If we're a bit more careful with our
viewport clipping, we can just re-emit it once at context creation
time.

Reviewed-by: Samuel Iglesias Gonsálvez <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

0 files changed, 0 insertions, 0 deletions