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Also, support 16 or 32-bit Z buffer at runtime.
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Move z-test code into do_depth_test().
Add ZSIZE symbol to support 2 or 4-byte Z values.
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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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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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