gallium: antialiased line drawing

New draw/prim stage: draw_aaline.  When installed, lines are replaced by
textured quads to do antialiasing.  The current user-defined fragment shader
is modified to do a texture fetch and modulate fragment alpha.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/draw/draw_prim.c b/src/gallium/auxiliary/draw/draw_prim.c
index 51e2242719..dd9a848863 100644
--- a/src/gallium/auxiliary/draw/draw_prim.c
+++ b/src/gallium/auxiliary/draw/draw_prim.c
@@ -121,11 +121,15 @@ static void draw_prim_queue_flush( struct draw_context *draw )
 
 void draw_do_flush( struct draw_context *draw, unsigned flags )
 {
+   static boolean flushing = FALSE;
+
    if (0)
       debug_printf("Flushing with %d verts, %d prims\n",
                    draw->vs.queue_nr,
                    draw->pq.queue_nr );
 
+   if (!flushing) {
+      flushing = TRUE;
 
    if (flags >= DRAW_FLUSH_SHADER_QUEUE) {
       if (draw->vs.queue_nr)
@@ -146,6 +150,9 @@ void draw_do_flush( struct draw_context *draw, unsigned flags )
 	 }
       }    
    }
+
+      flushing = FALSE;
+   }
 }