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blitscreen.readme
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1995-09-20
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Short: Ultimate c2p/copperscreen replacement!
Author: fischerj@informatik.tu-muenchen.de (Juergen "Rally" Fischer)
Uploader: g.sanderson@ais.gu.edu.au
Type: dev/src
BLITTERSCREEN: The copperscreen replacement, aka ultra-fast c2p, without
copperscreen limitations
I took this from http://www.informatik.tu-muenchen.de/~fischerj/
It still has a few problems on high end machines (A4000) and is not
very OS friendly, but it WORKS!!!
Contains sources, examples and a demo!
what is it ?
Blitterscreens provide a CHUNKY 256-color 2x2 or even 2x1 screen,
and all fullscreen! (AGA only, ECS could do byte-chunky 16colors,
not supported yet). cpu overhead very small, cpu free for
rendering, this method is even useful for 030!
is it really like having chunky mode ?
The cpu can copy to chunky buffer in longwords to chipmem, each
byte beeing extended to a 2x2 pixel block by custom hardware.
Imagine your A1200 was connected to a localbus-VGA. Copying to
vram then would be slower (!) as you got to copy 4 bytes to get
a 2x2 pixel block (VGA beeing fastmem changes nothing).
So stop whining about not having a chunky screen, there is one! :)
I admit it might be not ideal for a 040, but the 040 can do
realtime-1x1-c2p while copying to chipmembuffer anyway.
A 030-50 also might render faster than blitterscreen convertion.
============================= Archive contents =============================
Original Packed Ratio Date Time Name
-------- ------- ----- --------- -------- -------------
604 405 32.9% 14-Jan-80 16:49:54 blitterscreen.readme
6492 3105 52.1% 14-Jan-80 00:52:20 +bltscr.doc
13913 3101 77.7% 14-Jan-80 00:10:24 +bltscr.s
3480 1642 52.8% 13-Jan-80 23:20:52 +bs2x1
4132 1639 60.3% 13-Jan-80 23:21:06 +bs2x1.s
3456 1625 52.9% 13-Jan-80 23:18:38 +bs2x2
4135 1648 60.1% 13-Jan-80 23:18:30 +bs2x2.s
528 346 34.4% 14-Jan-80 16:53:48 +bs2xY.doc
36 36 0.0% 13-Jan-80 23:21:54 +d.8.95.doc
5387 1960 63.6% 14-Jan-80 15:58:10 +d.8.95.i
700 427 39.0% 24-Jan-94 17:22:58 +doom.bltscr.iff.doc
12812 12812 0.0% 24-Jan-94 17:11:58 +doom.bltscr.iff.lha
40736 40736 0.0% 13-Jan-80 22:12:26 +EXCESS.by.RIOT
329 240 27.0% 14-Jan-80 16:30:32 +EXCESS.by.RIOT.doc
1320 805 39.0% 11-Jan-80 20:24:56 +prec2
839 436 48.0% 13-Jan-80 22:18:12 +prec2.doc
457 298 34.7% 14-Jan-80 16:33:28 +README_first
694 369 46.8% 14-Jan-80 16:39:00 file_id.diz
-------- ------- ----- --------- --------
100050 71630 28.4% 14-Aug-95 12:08:28 18 files