This enables in shader defined transform feedback mode even if the
only place xfb_stride is defined is on the global out.
We don't worry about xfb_buffer since Issue 22 c) in the spec says:
"If the shader has an "xfb_buffer" qualifier identifying a buffer,
but doesn't declare "xfb_offset" on anything associated with it,
what happens?
...
variables not qualified with "xfb_offset" are not captured, which
makes the associated "xfb_buffer" qualifier irrelevant."
Reviewed-by: Dave Airlie <airlied@redhat.com>
Timothy Arceri
b77c909878