[Mesa-dev] default texture buffer object

Eric Anholt eric at anholt.net
Sun Jan 13 11:09:15 PST 2013

Dave Airlie <airlied at gmail.com> writes:

> Hi,
> so the gallium state tracker falls over with one of the TBO tests and
> I wsa wondering what the correct solution is.
> After the tests run, the test leaves the fragment shader bound, but
> has deleted the texture object and the buffer object,
> so we just have the ctx->Shared->DefaultTex[TEXTURE_BUFFER_INDEX],
> however since this has no buffer object bound
> the code falls over.
> Now the docs say the results of sampling from an tbo with no buffer
> object is undefined, but crashing isn't probably the right solution
> The intel driver seems to deal with there being no backing BO by
> binding an object at address 0 with w/h = 0.

I actually had written a test to make sure that rendering with no BO
didn't crash, before realizing that you actually were allowed to crash
for "undefined" behavior.  I'd be tempted to just fix the test that's
unintentionally testing this and if we want to avoid the crash, put in
the independent test for it.  Let me know if you want that.
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