i965: Clean up misleading defines for DWORD 2 of URB_WRITE header.

R02_PRIM_END and R02_PRIM_START don't actually refer to bits in DWORD
2 of R0 (as the name, and comments in the code, would seem to
indicate).  Actually they refer to bits in DWORD 2 of the header for
URB_WRITE messages.

This patch renames the defines to reflect what they actually mean.  It
also addes a define URB_WRITE_PRIM_TYPE_SHIFT, which previously was
just hardcoded in .c files.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

1 files changed, 6 insertions, 2 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_clip_line.c b/src/mesa/drivers/dri/i965/brw_clip_line.c
index 75c64c0..614849a 100644
--- a/src/mesa/drivers/dri/i965/brw_clip_line.c
+++ b/src/mesa/drivers/dri/i965/brw_clip_line.c
@@ -254,8 +254,12 @@ static void clip_and_emit_line( struct brw_clip_compile *c )
       brw_clip_interp_vertex(c, newvtx0, vtx0, vtx1, c->reg.t0, false);
       brw_clip_interp_vertex(c, newvtx1, vtx1, vtx0, c->reg.t1, false);
 
-      brw_clip_emit_vue(c, newvtx0, 1, 0, (_3DPRIM_LINESTRIP << 2) | R02_PRIM_START);
-      brw_clip_emit_vue(c, newvtx1, 0, 1, (_3DPRIM_LINESTRIP << 2) | R02_PRIM_END); 
+      brw_clip_emit_vue(c, newvtx0, 1, 0,
+                        (_3DPRIM_LINESTRIP << URB_WRITE_PRIM_TYPE_SHIFT)
+                        | URB_WRITE_PRIM_START);
+      brw_clip_emit_vue(c, newvtx1, 0, 1,
+                        (_3DPRIM_LINESTRIP << URB_WRITE_PRIM_TYPE_SHIFT)
+                        | URB_WRITE_PRIM_END);
    }
    brw_ENDIF(p);
    brw_clip_kill_thread(c);