Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!apple!motcsd!starnet!sschaem
From: sschaem@starnet.uucp (Stephan Schaem)
Newsgroups: comp.sys.amiga.graphics
Subject: Re: Colorburst and Animation
Message-ID: <1991Mar16.225128.16489@starnet.uucp>
Date: 16 Mar 91 22:51:28 GMT
References: <13948@life.ai.mit.edu> <1991Mar14.231042.26446@ncsu.edu>
Organization: Starnet-Public Access UNIX-Los Altos,CA 415-949-3133, login:info
Lines: 55


 320x200x12 at 20 frame second?
 the amiga video dma can 'support' 320x200x8 at 60 frame second,
 to do the transfere use hires.
 But you can transfer MORE in 1/60 of a second...
 why stop the video dma?
 I dont know what colorburst can support, but you can have the video
 working for more than 250 lines and horizontal 'overscan'.
 So lets say that you want to transfer only... use the sprite DMA
 also.so start at 24 and go to 216.So (216-24)*16 /8 = 384.
 put hires you get 384*2=768 pixel wide with 4bitplane in hires.
 So in less than 2 frame you can transfere for a 320x200x24
 screen...
 Thats 30 frame second to me.... or Am I misiing something in the
 calculation (suposed colorburste support 768*250*4.
 HOOPS sory with 255 line verticaly you just transfer a 320x200x24bit
 screen a the BIT CLOSE:-)

 To take a closer look: 320*200*24 / 8 = 192000 bytes
	AND	      : 768*250*4  / 8 = 96000  bytes :-) time 2 now...

	S

	So to correct things up, a 320x400x24 bit image can be animated
	at 15 frames seconds...
	And what can I say a 320x200x12 at 60 frame second! not 30!

	1280x1024x24 ? I think know people can anderstand why real time
	3D (or 4d graphics are OUT of this worlds:-)

	Also with some calculation you could animate 50 sprites of
	16X16 in 24 biplane during the transfere and have the blanking
	gap all for yourself:-)
	If you have a 68020 or best (cache) and even better a fast
	memory
	bus, well you could do magic!

	If MAST can confirm you can transfer with a screen of 768x250x4
	(Amiga posible without problems, on any in the world:-)
	than you can have FULL screen anymation with 50 24bit color
	sprites on it.

	And with if you can do block transfere?! you can have a full 2
	24 bit map (like the bay area) scrolling at 60 frames seconds
	in 640x400x24. (if colorburst support).

	The FUN thing would be a dual playfield support, setting all
	second plane to the background color and transfere screen
	that way, not disturbing you WB display during buffer fill...

	I like to play with display processor (since I made a 70 frame
	second display on a 1084 without the video processor , all DMA
	cut, only with a 68020 running the all thing..I can stop:-).
	And by the way there is a way to put a 1084 in 50hz mode by
	changing to video beam position...