I just had a couple questions about DirectDraw, I'll try to make it short [img]images/smiles/icon_smile.gif[/img]

1. If a surface (plain/backbuffer) is in system memory it doesn't require a Lock/Unlock to access, correct? Atleast not in the sense that the VRAM surfaces have to be locked?

2. Is there any hardware acceleration when blitting a surface in system memory to a surface in video memory? I'm guessing there must be since most blitting will be images/sprites to the back buffer.

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Mmm, well, that goes against basic logic. It's like saying your pointer to dynamically allocated data might randomly become invalid. Please, don't misunderstand, I don't mean to argue, but I hate doing things if I don't really have to.


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Ok, so you're sure blitting hardware isn't equiped for System to Video blits?

Thanks for you help [img]images/smiles/icon_smile.gif[/img]

[ July 30, 2003: Message edited by: Xanth ]</p>

1. You should still lock/unlock it. Under-the-hood, there is less of a reason for it in system RAM, but there are still no guarantees that windows will always let you get away without locking/unlocking them. Even if it works now, it may not later on (maybe in a future ver of windows).

2. I think there are AGP cards that do system-to-video and video-to-system accel (I've never heared of a system-to-system accel, that would be silly) Although, most of the time you would want as many of the sprites/etc as you can to be stored in video ram instead of system ram, because video ram to video ram transfers are faster.

[ July 30, 2003: Message edited by: Abscissa ]</p>