From: Pyros <yagoda AT netvision DOT net DOT il>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Page flipping with allegro
Date: Tue, 24 Aug 1999 23:23:49 +0300
Organization: NetVision Israel	
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

i use this proc i wrote, never tested it's speed against other ones,
it uses vesa1, but maybe this will work for ya.


BITMAP * curpage,page1,page2;
int pagenum=0;

void flippages()
{
 if (pagenum)
   {
    scroll_screen(0,480);
    pagenum=0;
    curpage=page1;
   }
 else
   {
    scroll_screen(0,0);
    pagenum=1;
    curpage=page2;
   }
}

//the init i do in the main func is:

 if (set_gfx_mode(GFX_VESA1,640,480,640,480*2)<0)
   {
    printf("ERROR: Can't allocate enough video memory."); return 1;
   }
 page1=create_sub_bitmap(screen,0,0,640,480);
 page2=create_sub_bitmap(screen,0,480,640,480);
 curpage=page2;


--
Pyros:
 _O_  M
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The Man Who Holds Fire In His Hand
----------------------------------
Avishay Yagoda
http://www.geocities.com/SiliconValley/Lakes/6993
E-mail: yagoda AT netvision DOT net DOT il