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 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/src/mesa/state_tracker/st_cb_fbo.c 
b/src/mesa/state_tracker/st_cb_fbo.c
index 5eda234..ae49434 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;
-- 
1.7.1

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