On Mit, 2002-01-30 at 15:26, Vladimir Dergachev wrote: > > On 30 Jan 2002, Michel [ISO-8859-1] Dänzer wrote: > > > On Mit, 2002-01-30 at 10:32, Vladimir Dergachev wrote: > > > > > > On 30 Jan 2002, Michel [ISO-8859-1] Dänzer wrote: > > > > > > > > Btw, while I've been sleeping I thought how we could get CCE support into > > > > > Xvideo. The thing I am really against is duplicating code for case with > > > > > CCE and without. > > > > > > > > Very much agreed. Eliminating that would also do the 2D acceleration > > > > much good, where a lot of functions are exact duplicates for both cases. > > > > > > > > > So, I thought, what about having "Software CCE" ? I.e. always use CCE > > > > > commands except that in case when dri driver is not availabe emulate > > > > > it. I am fairly certain emulating indirect buffer and 2d commands > > > > > would be pretty easy. > > > > I'm not sure it's so easy BTW. Have you looked at what CCE commands are > > available? I wouldn't want to implement a software emulation, but if you > > want to, have fun. :) > > Yes. The fact is you can either DMA them up to CCE engine or write them > directly into the FIFO.
Interesting, didn't know that. How would the FIFO be accessed then? > > > b) It might turn out that emulating CCE in software is faster then usual > > > OUTREGs > > > > How? The CCE doesn't do anything besides programming registers, does it? > > Because, for example, we are batching up register transfers. I don't understand what you mean, please elaborate. > > > f) the real problem is not outregs in the code, but INREGs - we'll need > > > to make them CCE aware anyways > > > > Are you sure that's a problem at all? IIRC the DRM code reads registers > > without special precautions about the CCE, but I don't have time to > > check right now. > > This depends on which registers you are reading. Some can be read all the > time, but some are not. Regardless, many INREGs depend on previous OUTREGs > having actually made it to the hardware. I hope there's a way besides shutting down the CCE to achieve that? PS: Please trim the citations in your posts. -- Earthling Michel Dänzer (MrCooper)/ Debian GNU/Linux (powerpc) developer XFree86 and DRI project member / CS student, Free Software enthusiast _______________________________________________ Dri-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/dri-devel
