From: Alan Hourihane <alanh@vmware.com>
Date: Fri, 20 Feb 2009 14:40:08 +0000 (+0000)
Subject: mesa: only call update_buffer when it's available
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=01c0c01a6d737d71a75cbd0de65c87c42b7ca230;p=mesa.git

mesa: only call update_buffer when it's available
---

diff --git a/src/mesa/state_tracker/st_cb_viewport.c b/src/mesa/state_tracker/st_cb_viewport.c
index 6adf3162c1e..7b175288fcb 100644
--- a/src/mesa/state_tracker/st_cb_viewport.c
+++ b/src/mesa/state_tracker/st_cb_viewport.c
@@ -40,7 +40,7 @@ static void st_viewport(GLcontext * ctx, GLint x, GLint y,
 {
    struct st_context *st = ctx->st;
 
-   if (st->pipe->winsys)
+   if (st->pipe->winsys && st->pipe->winsys->update_buffer)
       st->pipe->winsys->update_buffer( st->pipe->winsys,
                                        st->pipe->priv );
 }