From: Michel Dänzer <daenzer@vmware.com>
Date: Tue, 7 Jul 2009 10:17:04 +0000 (+0200)
Subject: gallium: Only set FRONT_STATUS_COPY_OF_BACK if there is a back buffer.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=96601ec8e0e35d540c1819a48df7f08ec5874ab7;p=mesa.git

gallium: Only set FRONT_STATUS_COPY_OF_BACK if there is a back buffer.

Fixes potential crash when SwapBuffers is called but there's no back buffer.
---

diff --git a/src/mesa/state_tracker/st_framebuffer.c b/src/mesa/state_tracker/st_framebuffer.c
index 33a90ea7db6..fe99fc08926 100644
--- a/src/mesa/state_tracker/st_framebuffer.c
+++ b/src/mesa/state_tracker/st_framebuffer.c
@@ -280,7 +280,8 @@ st_notify_swapbuffers(struct st_framebuffer *stfb)
 		PIPE_FLUSH_SWAPBUFFERS |
 		PIPE_FLUSH_FRAME,
                 NULL );
-      ctx->st->frontbuffer_status = FRONT_STATUS_COPY_OF_BACK;
+      if (st_renderbuffer(stfb->Base.Attachment[BUFFER_BACK_LEFT].Renderbuffer))
+         ctx->st->frontbuffer_status = FRONT_STATUS_COPY_OF_BACK;
    }
 }