Re: GGI Project Unhappy On Linux
Richard Gooch (rgooch@atnf.CSIRO.AU)
Fri, 27 Mar 1998 10:49:25 +1100
Alan Cox writes:
> > > (Note BTW its arguable that soon not only text mode but all direct frame
> > > buffer access will go out of fashion. Its an expensive slowing item that
> > > adds cost and major complexity to the performance critical memory subsystem
> > > on the video card).
> >
> > Erk! So what happens to blitting images to the screen?
>
> Dear graphics controller, there is a nice pixmap in main memory at
> 0xD0A13C30, its 64x64 pixels square and in RGB888 format, please map it
> to the 8bit mode colours you are in and dither if neccessary. If you'd be
> kind enough to post me an interrupt when you've finished I'd be greatful
OK, that sounds nice, but... my 1024x1024 image is in application VM,
which is fragmented in physical RAM. Does this humble request include
a page translation table? Or can the graphics chip access the CPUs MMU?
Or are we stuck with pre-allocating "DMA buffers" and doing an extra
copy?
Regards,
Richard....
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