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reported by clang static analyzer
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Avoids warnings on 64bit builds.
Use regular unsigned since that's what gallium expects, but use a
typedef to facilitate possible changes in the future.
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The core reference counting code is centralized in p_refcnt.h.
This has some consequences related to struct pipe_buffer:
* The screen member of struct pipe_buffer must be initialized, or
pipe_buffer_reference() will crash trying to destroy a buffer with reference
count 0. u_simple_screen takes care of this, but I may have missed some of
the drivers not using it.
* Except for rare exceptions deep in winsys code, buffers must always be
allocated via pipe_buffer_create() or via screen->*buffer_create() rather
than via winsys->*buffer_create().
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The debug functions depend on several util function for os abstractions, and
these depend on debug functions, so a seperate module is not possible.
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This reverts commit a6d866f72c88d48d2bcfb3e3c882fdb639b5a8ce.
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Used mostly to aid debugging memory issues or to clean up resources when
the drivers are long lived.
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Also, rename p_tile.[ch] to u_tile.[ch]
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Simple wrapper around pb_malloc_buffer_create for convenience.
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"aux" is a reserved name on Windows (X_X)
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