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Just use the gl_buffer_object::Size field. Remove unnecessary size/offset
error checks. Core Mesa will have already done these checks before these
functions are called.
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wrapper
Since commit 6629a35559ff7e3b993966f697f7c7f68e5a38d9 "mesa: create/destroy
buffer objects via driver functions" this is no longer needed, and actually
was causing a crash during context tear-down.
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Provide an actual definition of the pipe_buffer struct, containing
the parameters used to create the buffer, and its refcount.
Shift refcounting buffers out of the winsys interface, similar to
surfaces & textures.
Rework pipebuffer/ to reflect the fact these changes, and also Michel's
reworking of the buffer interface.
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The properties of a buffer represented by struct pipe_buffer_handle are now
basically constant over its lifetime. The state tracker gets to deal with any
more complex buffer semantics it may need to provide.
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We need to do these initializations before initializing the Mesa context
because context init involves creating texture/program/etc objects.
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The state_tracker driver needs these to implement, eg. pixel buffer objects,
vertex buffer objects.
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