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- From: aa399@cleveland.Freenet.Edu (Len Stys)
- Newsgroups: comp.sys.atari.st
- Subject: Re: Apology: True Colour *IS* great for games.
- Date: 21 Dec 1992 16:29:47 GMT
- Organization: Case Western Reserve University, Cleveland, OH (USA)
- Lines: 42
- Message-ID: <1h4rdrINN55v@usenet.INS.CWRU.Edu>
- References: <11490@uqcspe.cs.uq.oz.au>
- Reply-To: aa399@cleveland.Freenet.Edu (Len Stys)
- NNTP-Posting-Host: thor.ins.cwru.edu
-
-
- In a previous article, warwick@cs.uq.oz.au (Warwick Allison) says:
-
- >A while back I said that bit-plane modes are better than the word-per-pixel
- >modes, for speed of sprite drawing, and TrueColour (word-per-pixel) would
- >be best used just for title screens. bzzt - I was wrong.
- >
- >
- >I did some calculations and coding on the weekend, and it turns out that
- >TrueColour (word-per-pixel) is actually VERY good for games. I expect
- >that a game using the Falcon 320x240 truecolor mode will be around twice
- >the speed of the same game written on an ST using Low resolution, simply
- >due to the CPU speed. And a LOT prettier (65536 colours vs. 16).
- >
- > ie. drawing sprites in TrueColour is as fast as drawing them
- > in 4 bitplane mode.
- >
- >Plus, sound processing will have a MUCH lower cpu overhead on the Falcon,
- >so games will gain speed there (and sound a lot better!)
- >
- >The reason why TrueColour is so good for games is that no shifting is
- >required, plus only the area actually drawn on needs to be accessed (and
- >hence stored for wiping purposes).
- >
- >
- >--
- >Warwick
-
-
- But STILL, the Falcon030 needs more than 1 Meg for these TRUE COLOR
- video or they won't even be used.
-
- So what does all this mean now? The games will run somewhat faster
- than we thought in true color mode. But, a graphics coprocessor would
- still be necessary for rotation, 3-d imaging, scaling, etc.
- Because you don't want to have to write these routines into your
- game which will not only take up more memory, but also more speed.
-
- >
-
- --
-
-