From: "Al Morgan" <muaddib AT proaxis DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Page Flipping & Allegro
Date: Sun, 22 Aug 1999 03:24:31 -0700
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Whats a good way to do page flipping with allegro?  Most of my attempts make
the program go way way way slower than it previously did.  I don't know if
that's unavoidable, or if I'm doing it wrong.

I did it something like this before:

void page_flip()
    {
    show_video_bitmap(screen2); // thats the screen i would write everything
onto
                                                   // would this function
copy screen2 to screen, or
                                                   // would it change the
viewport to screen2?

    }

void main()
    {
    // set the gfx mode to 320, 240 view, 320, 480 virtual size
    while(!gameover)
        {
        drawstuff();
        page_flip();
        }
    }

Thanks,
    Al [muaddib AT proaxis DOT com]