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into r6xx-rewrite
This builds, but I get an assertion in radeonGetLock() due to
the drawable being null.
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This moves a big chunk of the space checking code into libdrm so
it can be shared by the DDX.
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This reverts commit 0952645fe04a27968565ea4d913500c23b1b11e3.
Need to revisit where this is going wrong
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This allows us to return the unused portion of the dma buffer
to the allocator instead of wasting nearly 16k a pop.
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Revalidate can trigger flushing and dma buffer deallocation,
so retry allocation on such case.
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This fixes up the buffer validation scheme, so that we keep a list
of buffers to validate so cmdbuf flushes during a pipeline get
all the buffers revalidated on the next emit.
This also fixes radeonFlush to not flush unless we have something
useful to send to the GPU, like a DMA buffer or something not state
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Context destruction was nearly the same over all the drivers,
so collapse it down.
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When we finish emitting swtcl objects, we request space in the cmdbuf,
and flush if no space exists. However in this case we also flush
the DMA buffer we just put the vertices we wanted to send in.
This checks in advance if we have space in the buffer.
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