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- Newsgroups: comp.sys.amiga.graphics
- Path: sparky!uunet!think.com!sdd.hp.com!col.hp.com!fc.hp.com!koren
- From: koren@fc.hp.com (Steve Koren)
- Subject: Re: AGA anim speed
- Sender: news@fc.hp.com (news daemon)
- Message-ID: <BzpyK5.6Ku@fc.hp.com>
- Date: Wed, 23 Dec 1992 15:48:05 GMT
- References: <38122@cbmvax.commodore.com>
- Organization: Hewlett-Packard Fort Collins Site
- X-Newsreader: Tin 1.1.3 PL5
- Lines: 49
-
- > I suspect that these numbers are with promotion turned on. 640x400
- > 31khz 8 bit ham has the chip memory bandiwdth totally saturated (like
-
- No, it was not using promotion - I shut off both that and PKludge before
- running the anim. But I did miss a little on the frame rate (I was just
- guessing). I timed it exactly last night, and it is doing somewhere
- between 5 and 5.25 FPS in 640x400x8, interlaced.
-
- I dunno, that seems OK to me. At least its *way* faster than my
- 2000/040 was capable of going.
-
- I think to a large extent it depends on the number and size of the
- deltas between frames. On my 2000 I never got more than 2 or 3 FPS from
- 640x400x4 with fairly large delta sizes, but I could get 20 FPS in the
- same 640x400x4 with smaller deltas. I have no doubt the 4000 would go 3
- or 4 times faster in the same cases. But here, we're pushing twice the
- amount of data per frame (deep screen), and the deltas are large. So
- the 4000 running 5 or 6 FPS from an 8 plane screen with large deltas is
- moving data at 4X the speed that the 2000 was, when the 2000 was running
- 2 or 3 FPS from a 4 plane screen. Also, if PPShow is 4X faster than
- VTek on the very same anim file, one wonders if yet another anim program
- might be faster than PPShow - maybe the hardware can do more than the
- software I'm using can do.
-
- Another factor is that there were some pixel level changes between
- frames in *many* places where they shouldn't have been (I'm talking
- perhaps a hundred pixel level differences between frames where it should
- have been static). This probably causes the anim player more headaches
- that it should have to put up with. When DPaint V becomes available and
- I can clean up the anim to eliminate these artifacts, it should go
- faster.
-
- At any rate, I reduced the animation to 320x400xHAM8 to increase speed
- and reduce the anim size, and now I get 12 FPS for a 250 frame anim,
- which is perfectly reasonable and looks pretty smooth. And 320x400xHAM8
- looks *way* better than any animation ever did on my 2000. Comparing
- HAM8 to HAM is kind of like comparing SVGA to CGA, or AmigaDos to
- Windows :-). Well, maybe not quite that much, but at least there is a
- very big difference.
-
- I also tried converting the same animation (which has a lot of smooth
- color changes - its ray traced with Imagine) to 256 color register mode,
- and the HAM8 version is, again, much nicer. The 256 color version
- either has severe banding, or obnoxious dithering - you get your choice
- of evils, because there simply aren't enough colors to go around. The
- HAM8 one simply looks nicer on all accounts - ImageMaster reports that
- most of the frames use around 1800 colors, and some up to 3500 colors.
-
- - steve, a recently converted fan of HAM8
-