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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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Front buffer rendering works as it stands but it completely
wrong. But as it stands fake front buffer rendering is
completely broken. So we keep it as it is. But lets atleast
handle it in the get buffers code.
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Doesn't do anything because we can't tell the X server about
any changes to the fake front buffer.
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This was based of the unfinnished code that Keith
Whitwell started on but never finnished. I moved
the code from the glx directory because dri drivers
can be used for more things then just glx.
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