Mesa (master): draw: fix division-by-zero for empty geometry shaders

[Marek Olšák]

Module: Mesa
Branch: master
Commit: 27a34f62baa991eadd040302748c48b31ec21a0c
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=27a34f62baa991eadd040302748c48b31ec21a0c

Author: Marek Olšák <marek.olsak at amd.com>
Date:   Sun Mar  1 11:18:42 2015 +0100

draw: fix division-by-zero for empty geometry shaders

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=89372

Reviewed-by: Dave Airlie <airlied at redhat.com>

---

 src/gallium/auxiliary/draw/draw_pt_emit.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/gallium/auxiliary/draw/draw_pt_emit.c b/src/gallium/auxiliary/draw/draw_pt_emit.c
index b215c5f..d1eafd8 100644
--- a/src/gallium/auxiliary/draw/draw_pt_emit.c
+++ b/src/gallium/auxiliary/draw/draw_pt_emit.c
@@ -113,8 +113,11 @@ draw_pt_emit_prepare(struct pt_emit *emit,
       emit->translate = translate_cache_find(emit->cache, &hw_key);
    }
 
-   *max_vertices = (draw->render->max_vertex_buffer_bytes /
-                    (vinfo->size * 4));
+   if (!vinfo->size)
+      *max_vertices = 0;
+   else
+      *max_vertices = (draw->render->max_vertex_buffer_bytes /
+                       (vinfo->size * 4));
 }