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This interface is defined by softpipe and any window system (eg i915pipe)
wishing to use softpipe is required to implement the interface.
Currently the interface is all about buffer management.
Generalizing, each pipe driver will advertise an interface in a similar
spirit to this, and again any window system driver wishing to use that
rendering pipeline will have to implement the interface it defines. It
clearly isn't a one-way street however, as softpipe could just do its own
buffer management with malloc. The interaction with a buffer manager is
desired to allow us to exercise the hardware swapbuffers functionality of
the i915pipe driver, and also to get a feel for the way hardware drivers
which really need a buffer manager will work.
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pipe->clear() only used to clear whole buffers (no scissor) w/out masking.
Draw a colored quadrilateral in all other cases.
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Also some minor clear fixes.
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Still require the intelClear() call to flush batchbuffers. That will be
removed later...
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now.
Note: softpipe_clear() should really be renamed to something like
pipe_clear_with_blits() and put into a driver-indepedent module...
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Add a 'mask' param to region_fill() to help with clearing combined Z/stencil buffers, glColorMask, etc.
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