draw: fix edgeflag handling on the pt paths

Encode edgeflags (and reset_stipple info) into the top two bits of the
fetch elements.  This info could be moved elsewhere, but for now we
can live with a 1<<30 maximum element size...

Also use the primitive decomposition code from draw_prim.c verbatim, as
it includes all this stuff and is known to work.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/draw/draw_pt.h b/src/gallium/auxiliary/draw/draw_pt.h
index 800072c5115..590823fd330 100644
--- a/src/gallium/auxiliary/draw/draw_pt.h
+++ b/src/gallium/auxiliary/draw/draw_pt.h
@@ -40,6 +40,16 @@ typedef unsigned (*pt_elt_func)( const void *elts, unsigned idx );
 struct draw_pt_middle_end;
 struct draw_context;
 
+/* We use the top couple of bits in the vertex fetch index to convey a
+ * little API information.  This limits the number of vertices we can
+ * address to only 1 billion -- if that becomes a problem, these could
+ * be moved out & passed separately.
+ */
+#define DRAW_PT_EDGEFLAG      (1<<30)
+#define DRAW_PT_RESET_STIPPLE (1<<31)
+#define DRAW_PT_FLAG_MASK     (3<<30)
+
+
 /* The "front end" - prepare sets of fetch, draw elements for the
  * middle end.
  *