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, 1 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/draw/draw_private.h b/src/gallium/auxiliary/draw/draw_private.h
index 8c469e74b73..6abced139ba 100644
--- a/src/gallium/auxiliary/draw/draw_private.h
+++ b/src/gallium/auxiliary/draw/draw_private.h
@@ -182,6 +182,7 @@ struct draw_context
       struct draw_stage *stipple;
       struct draw_stage *aapoint;
       struct draw_stage *aaline;
+      struct draw_stage *pstipple;
       struct draw_stage *wide;
       struct draw_stage *rasterize;
    } pipeline;