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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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It's now the responsibility of surface users to keep track of their mappings.
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Directly use struct pipe_buffer_handle for storage and struct pipe_surface for
(un)mapping.
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pipe->get_tex_surface() has to be used for access to texture image data.
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pipe_surface now has a pointer to the winsys which create/owns the surface.
This allows clean surface deallocation w/out a rendering context.
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Move pipe_region/surface_reference functions to pipe/p_inlines.h.
Remove #include "p_util.h" from pipe/p_context.h.
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