Re: [Dev-C++] some more to Graphics

[Elias P. <Eli...@ao...>]

  oh, and also... I would like to know about page-flipping/buffering in =
640x480??

If you want to know the difference to 320x200, it is basically the same. =
Only, in 320x200 you don't need page-flipping because you can update all =
the pixels on the screen fast enough to get smooth animation without it.

Page flipping is a technique to create smooth graphics movement. =
Basically, you 'buffer' the data to be displayed, and only when they are =
ready, they are displayed. For example, if you make an animation where a =
circle moves over a background, you will use an 'offscreen-page' or =
'back-buffer'  where you first draw the background, then the circle over =
it, and then display it. While it is displayed, you (invisibly) draw the =
background on the next offscreen page, then the circle on it, and then =
swap both pages, so the new one gets displayed. Now you draw the next =
animation frame on the first page, and so on... the same is used for =
more complex animations like in 3d games. The advantage is that the =
watcher of the program never sees how the background and the circle are =
drawn, so it looks like there is a smooth animation. (as long as you =
flip new pages at least about 30 times per second)

I'm not sure how you can tell a DOS program to do this. I'm using the =
DOS-Allegro library where i have a function show_video_page to do the =
page-flipping, or DirectX where you have Surface->Flip or something =
similiar depending on the version.

Elias Pschernig