draw/clip: don't emit so many empty triangles

Compress empty triangles (don't emit more than one in a row) and
never emit empty triangles if we already generated a triangle
covering a non-null area. We can't skip all null-triangles
because c_primitives expects ones that were generated from vertices
exactly at the clipping-plane, to be emitted.

Signed-off-by: Zack Rusin <[email protected]>
Reviewed-by: José Fonseca <[email protected]>
Reviewed-by: Roland Scheidegger <[email protected]>

0 files changed, 0 insertions, 0 deletions