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Kieran
Site Admin
Joined: Sat Jul 25, 2009 7:44 am
Posts: 274
Location: United Kingdom
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 Re: VGA VESA Screen Updates Im with Love4Boobies on this, I think UDI could become invaluable to the osdev community.
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Thank you for reading,
Kieran C G Foot
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| Mon Feb 22, 2010 1:30 am |
 
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smeezekitty
Joined: Tue Apr 20, 2010 1:39 pm
Posts: 17
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Re: VGA VESA Screen Updates HELLO WORLD! VESA basically switches modes so you can do direct memory access. How is this slow?!?!?!    
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| Mon Apr 26, 2010 5:34 pm |
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DudeOfX
Joined: Sat Jul 25, 2009 9:15 am
Posts: 257
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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...
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| Wed Apr 28, 2010 8:47 am |
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Kieran
Site Admin
Joined: Sat Jul 25, 2009 7:44 am
Posts: 274
Location: United Kingdom
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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.
_________________
Thank you for reading,
Kieran C G Foot
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| Thu Apr 29, 2010 2:56 pm |
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