From: Darren Johns Newsgroups: comp.os.msdos.djgpp Subject: Re: scrolling with allegro Date: 02 Jul 1998 16:58:51 +0100 Organization: University of Aberdeen, Scotland Message-ID: References: <001a01bda51b$07837e40$624d08c3 AT arthur> NNTP-Posting-Host: trogon.csd.abdn.ac.uk Lines: 23 To: djgpp AT delorie DOT com DJ-Gateway: from newsgroup comp.os.msdos.djgpp Precedence: bulk >>> One scheme is to create a very large bitmap object that is your level, >>> and then blit the appropriate piece onto the screen. >>> -- >> >>Well that is not memory efficient, but the easiest approach. > > >Not memory efficient. Hmm. Let me see: for a 1600x1600 map (for instance) in >256 colours - that's 625Mb of ram. (!) Hmm. interesting maths, I make 1600*1600*1 = 2.44Mb. You seem to have 1600*1600*256 = 625Mb, thats a colour depth of 2^2048 (2 to the power 2048), that's an awfully high number of colours! (I make 2^256 > 1.15*10^77). Of course if you meant 625M_bits_ of RAM I'll shut up, otherwise you were out by two orders of magnitude. /Mark. -- | To take no action is in itself taking an action, and to have no opinion is | |/-\| to have an opinion, so are we helpless in what goes on around us?? |/-\| |\-/|\-/|\-/|\- D Mark Johns. mailto:djohns AT csd DOT abdn DOT ac DOT uk -/|\-/|\-/|\-/| |_____________________ http://www.csd.abdn.ac.uk/~djohns ____________________|