Video Memory Offset
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Just a quick question: Where is the video memory offset? I want to copy my graphics buffer directly to there. I''m using 24-bit graphics.
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first. how you can be using a 24 bpp mode and don''t know how is it the offset of graphics memory ??
second. if you are not programming for msdos or similar, you don''t need to deal with graphics memory offset.
second. if you are not programming for msdos or similar, you don''t need to deal with graphics memory offset.
quote:
first. how you can be using a 24 bpp mode and don''t know how is it the offset of graphics memory ??
He''s probably working with C++ and directX/opengl.
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first. how you can be using a 24 bpp mode and don''t know where is it the offset of graphics memory ??
second. if you are not programming for msdos or similar, you don''t need to deal with graphics memory offset.
second. if you are not programming for msdos or similar, you don''t need to deal with graphics memory offset.
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Well, from what I can recall, back in the days when I was programming Vesa on MS-DOS... the offset used to be 0xA000 for graphics mode. I think it was 0xB000/0xB800 in text mode.
That was real-mode and that was dos, where you still had direct hw access.
Any modern OS uses protected mode, and won''t give you direct hw-access that easily... I think you''re better of using a high level api or at least a driver or something, unless you want to do everything by hand.
That was real-mode and that was dos, where you still had direct hw access.
Any modern OS uses protected mode, and won''t give you direct hw-access that easily... I think you''re better of using a high level api or at least a driver or something, unless you want to do everything by hand.
actually it''s a0000/b8000. a000/b800 is the segment address.
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quote:Original post by Wildfire
Any modern OS uses protected mode, and won''t give you direct hw-access that easily... I think you''re better of using a high level api or at least a driver or something, unless you want to do everything by hand.
DirectDraw, IMHO, handles this pretty elegantly.
Whoops, yeah, those funny additional zeros that caused a lot of pain sometimes... dos addresses used do be 20 bits 
Anyways, I think it's been what, 10 years? So I think my memory wasn't that bad... =D
Uhm, DirectDraw == API, or not? So, what's your point. If you're telling that DirectDraw has direct access... well, it's part of DirectX (~part of the OS more or less). I didn't say it's impossible to get direct hw access.
[edited by - Wildfire on August 7, 2003 3:47:47 PM]
Anyways, I think it's been what, 10 years? So I think my memory wasn't that bad... =D
quote:
DirectDraw, IMHO, handles this pretty elegantly.
Uhm, DirectDraw == API, or not? So, what's your point. If you're telling that DirectDraw has direct access... well, it's part of DirectX (~part of the OS more or less). I didn't say it's impossible to get direct hw access.
[edited by - Wildfire on August 7, 2003 3:47:47 PM]
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