Re: [PATCH] Disable mach64 accelerator if stride is not multiple of 64
flat view
From: <hidden>
Date: 2009-06-18 10:17:10
Mikulas Patocka napisa³(a):
BTW. why doesn't it use accelerator for screen scrolling? It seems to redraw all non-empty characters, which is fast if most of the screen is empty but gets slower if the screen is full of text.
It uses the accelerater.. The screen redraw uses accelerated imageblit() function if it exists. In order to use the blitter one must define FBINFO_READS_FAST flag. However, it may not end up faster. It is faster if the memory is fast while chip is not so fast relatively (e.g. all new GeForce and Radeon chips, 3DFxx Voodoo3+ have very fast memory attached). It may vary for other chips, i.e. even if your ati card equiped with sgram it is faster it may be slower for the same chip with sdram. Also, if blitter is used for scrolling the crolling speed goes down with increasing pixel depth which is not a case for the redraw method. Regards, Krzysztof ---------------------------------------------------------------------- Nowa akcja Pepsi - nagrody za kody spod nakretek. Zarejestruj sie! http://link.interia.pl/f21cc ------------------------------------------------------------------------------ Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects