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VGA VESA Screen Updates http://forums.osdever.net/viewtopic.php?f=7&t=141 |
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Author: | Kieran [ Mon Feb 22, 2010 1:30 am ] |
Post subject: | Re: VGA VESA Screen Updates |
Im with Love4Boobies on this, I think UDI could become invaluable to the osdev community. |
Author: | smeezekitty [ Mon Apr 26, 2010 5:34 pm ] |
Post subject: | Re: VGA VESA Screen Updates |
HELLO WORLD! VESA basically switches modes so you can do direct memory access. How is this slow?!?!?! |
Author: | DudeOfX [ Wed Apr 28, 2010 8:47 am ] |
Post subject: | Re: VGA VESA Screen Updates |
I think its slow because of the way the memory banks are mapped... its not guarranteed to access all the video memory linearly... I remember when DirectX first came out, I remember they used a cheap trick, they used the CPU's General Protection Fault system to switch banks automaticaly... so to the programmers the video memory appears to be mapped linearly... |
Author: | Kieran [ Thu Apr 29, 2010 2:56 pm ] |
Post subject: | Re: VGA VESA Screen Updates |
I remember messing with vesa aat low level before and there are so many deviations from the standards too. Not to mention the banking. |
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