From fb5d9e1199cabe653ae1bb822bb66ce9f0ce7f55 Mon Sep 17 00:00:00 2001
From: Marek Olšák <maraeo@gmail.com>
Date: Sun, 6 Mar 2011 05:26:13 +0100
Subject: st/mesa: fail to alloc a renderbuffer if
 st_choose_renderbuffer_format fails

This fixes:
  state_tracker/st_format.c:401:st_pipe_format_to_mesa_format:
  Assertion `0' failed.
---
 src/mesa/state_tracker/st_cb_fbo.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/mesa/state_tracker/st_cb_fbo.c b/src/mesa/state_tracker/st_cb_fbo.c
index 5eda2346c60..ae49434cac9 100644
--- a/src/mesa/state_tracker/st_cb_fbo.c
+++ b/src/mesa/state_tracker/st_cb_fbo.c
@@ -79,7 +79,11 @@ st_renderbuffer_alloc_storage(struct gl_context * ctx,
    else
       format = st_choose_renderbuffer_format(screen, internalFormat,
                                              rb->NumSamples);
-      
+
+   if (format == PIPE_FORMAT_NONE) {
+      return FALSE;
+   }
+
    /* init renderbuffer fields */
    strb->Base.Width  = width;
    strb->Base.Height = height;
-- 
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