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Kieran
Site Admin
Joined: Sat Jul 25, 2009 7:44 am Posts: 274 Location: United Kingdom
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![Post Post](./styles/serenity/imageset/icon_topic_latest.gif) Re: VGA VESA Screen Updates
Im with Love4Boobies on this, I think UDI could become invaluable to the osdev community.
_________________ 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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![Post Post](./styles/serenity/imageset/icon_topic_latest.gif) Re: VGA VESA Screen Updates
HELLO WORLD! VESA basically switches modes so you can do direct memory access. How is this slow?!?!?! ![Confused :?](./images/smilies/icon_e_confused.gif)
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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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![Post Post](./styles/serenity/imageset/icon_topic_latest.gif) 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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![Post Post](./styles/serenity/imageset/icon_topic_latest.gif) 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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