On Mer, 2004-10-06 at 22:02, Ian Romanick wrote:
Here's my question. Is there any way to "trick" it into doing back-to-back reads as a single PCI transfer? So, if I did something like:
Not that anyone has found. I'm not sure PCI even really allows it except for prefetchable memory.
Except of course DMA - so the DMA for radeon announcement seems ideal for Mesa here.
Note that there's some code in there already which uses the blitter to copy from framebuffer to agp memory, though it tries to implement the entire readpixels() operation rather than being a useful low-level operation.
Keith
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