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post-xform vertex attribs to hw vertex attribs
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When the SPU is done copying a batch buffer to local store, use an mfc_put()
to write a "done" message back to the buffer status array in main memory.
We were previously using a mailbox message for synchronization.
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Plus, update i915 and Cell drivers for latest vbuf->draw() params.
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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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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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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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