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XScale blitting


Postby goro » Aug 22, 2003 @ 5:06pm

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Postby rcp » Aug 23, 2003 @ 5:28am

ya, you bog down the bus and are left to play with registers. Probably not what you wanted to hear. You can an overall speedup, but not 2x or so. If the OEM's would write their device drivers correctly, then you could use a standard GDI BLT and things would be much better. (still not 2x) I am afraid you are going to have to make do with what we have for now and wait for better hardware in the future.
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Dell Axim problems

Postby bofw3 » Nov 4, 2003 @ 6:08pm

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Postby rcp » Nov 4, 2003 @ 6:32pm

The XScale docs cover this very well. Unfortunately, you can only do this on the kernel side of WinCE. Basically, you need to write a new device driver. A slightly less intensive solution would be to write a DMA driver on the kernel side and use it from the user side to do your BLTs.

This is not trivial stuff... it involves gettings your hands very dirty and using the WinCE DDK to build a driver. On the positive side, it is very straightforward and you should find samples in the DDK.

I never completed this because the speed increase was not worth writting a DMA driver to install on other peoples PPC. I am sure that reliablity, given some of the different PPC configurations, was sure to be low.

We probably will end up doing this, but not this year.

Best of luck!

-rcp
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Postby bofw3 » Nov 6, 2003 @ 5:57pm

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Postby aybabtu » Nov 12, 2005 @ 7:29am

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