draw: reset extra_vp_outputs.slot to zero in widepoint_flush()

Fixes a crash when clearing the window with a quad after drawing large
points.  We were asking the draw module how many vertex shader outputs
there were and got 3 instead of 2.  This led to creating vertices with
too many attributes and trying to read invalid memory.

We reset extra_vp_outputs.slot to zero in the aaline/aapoint stage's
flush functions already.
This omission was just an oversight in the wide_point stage.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/draw/draw_pipe_wide_point.c b/src/gallium/auxiliary/draw/draw_pipe_wide_point.c
index 49034ae86a2..d84bab9eaae 100644
--- a/src/gallium/auxiliary/draw/draw_pipe_wide_point.c
+++ b/src/gallium/auxiliary/draw/draw_pipe_wide_point.c
@@ -253,6 +253,7 @@ static void widepoint_flush( struct draw_stage *stage, unsigned flags )
 {
    stage->point = widepoint_first_point;
    stage->next->flush( stage->next, flags );
+   stage->draw->extra_vp_outputs.slot = 0;
 }