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This fixes sporadic rendering glitches.
Using a mailbox msg for now, until spe_mfcio_tag_status_read() or similar
is found to work.
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The later doesn't seem to work properly in SPU code.
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default yet.
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The draw module's vbuf stage builds buffers of post-transformed vertices
and issues draw-elements calls to render them. We'll pass the vertex and
index buffers to the SPUs...
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Tiles are marked as CLEAR, DEFINED or DIRTY to avoid making unnecessary
get_tile() and put_tile() calls.
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possible.
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Also, improve some surface clearing code
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The cell "render_stage" (last in the "draw" pipeline) emits vertices into
a buffer which is pulled by the SPUs in response to a "RENDER" command.
This is pretty much temporary/scaffold code for now.
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Track vertex/fragment shader state.
Plug in pipe->draw_arrays(), pipe->draw_elements().
Plug render stage (a stub) into end of 'draw' pipeline.
Specify a hard-coded vertex format for now.
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