gallium: new draw stage for polygon stipple.

For hardware without native polygon stipple.  Create a 32x32 alpha texture
that encodes the stipple pattern.  Modify the user's fragment program to
sample the texture (with gl_FragCoord) and kill the fragment according to
the texel value.
Temporarily enabled in softpipe driver, replacing the sp_quad_stipple.c step.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/gallium/drivers/softpipe/sp_quad.c b/src/gallium/drivers/softpipe/sp_quad.c
index 6bd468a51cf..15b5594547d 100644
--- a/src/gallium/drivers/softpipe/sp_quad.c
+++ b/src/gallium/drivers/softpipe/sp_quad.c
@@ -112,7 +112,9 @@ sp_build_quad_pipeline(struct softpipe_context *sp)
       sp_push_quad_first( sp, sp->quad.earlyz );
    }
 
+#if !USE_DRAW_STAGE_PSTIPPLE
    if (sp->rasterizer->poly_stipple_enable) {
       sp_push_quad_first( sp, sp->quad.polygon_stipple );
    }
+#endif
 }