Log inRegister an accountBrowse CSDbHelp & documentationFacts & StatisticsThe forumsAvailable RSS-feeds on CSDbSupport CSDb Commodore 64 Scene Database
 Welcome to our latest new user AndyAsth ! (Registered 2017-10-16) You are not logged in 
CSDb User Forums


Forums > C64 Coding > DYPP
2017-03-29 15:36
Rudi

Registered: May 2010
Posts: 98
DYPP

Hi,
DYPP - Different Y Pixel Position.
I don't seem to find an explanation on this effect on C64 on codebase or anywhere. Maybe its in another thread here on csdb, then please provide an link.

I know the basics of sines, ive made sinescroll on PC, but its easier there since you can look up the framebuffer directly, via sine-tables and so on.

Im wondering how this effect is easily made on C64. I believe there are more than one way, but i guess one way is slower than the other; for example moving each column-bit (inside a char) in realtime. The other way I think is having the chars animated, similar to a twister. Though, im thinking each angle is used for lookup table. I just dont seem to get it right in my mind to start coding on this effect. I've seen several early cracktros and demos that does this very fast, but haven't had the time to reverse-engineer the binaries. If you have any tips and info i'd appreciate it, or even better; write an explanation for codebase.
Thanks
 
... 19 posts hidden. Click here to view all posts....
 
2017-03-31 12:40
mankeli

Registered: Oct 2010
Posts: 42
I would do 8 copies of the charset (one for each pixel column) and then just LDA ORA ORA ORA ORA ORA ORA STA.
If you arrange chars nicely, maybe you can unroll the whole thing and do LDY LDA,y ORA,y ... dunno.
Maybe there's better way as well.
2017-03-31 13:37
Oswald

Registered: Apr 2002
Posts: 4089
better way: speedcode per char, to skip empty pixels.
2017-03-31 14:25
Compyx

Registered: Jan 2005
Posts: 271
Even better: use VSP, that way the shape of the dypp doesn't actually change and you can optimize a lot of code (no need to clear stuff, perhaps 'join' a few pixels in a single ORA, etc).
2017-03-31 14:53
Oswald

Registered: Apr 2002
Posts: 4089
Quote: There exists an old, but pretty good DYPP based on VSP in Anal Intruder. And AFAIK the best completely dynamic DYPP is in Mekanix.

mekanix is cheating as far as I'm concerned, lda sta code, no ORA.
2017-03-31 15:28
HCL

Registered: Feb 2003
Posts: 667
Quote: mekanix is cheating as far as I'm concerned, lda sta code, no ORA.

Mekanix is using precalculated fonts for a range of angles. It is still calculating individual sinus-values for each pixel-column, and then mapping it to best possible font.. The accuracy is ok i would say :). Also this way it can do more funny sinuses than VSP-stuff.
2017-03-31 22:32
Compyx

Registered: Jan 2005
Posts: 271
Gotta admit those DYPP's look really smooth, and using a movement you can't get with VSP-trickery.

Never had seen that demo before even, I'm lagging behind badly :)
2017-03-31 22:35
ChristopherJam

Registered: Aug 2004
Posts: 652
Ah, so that's how they managed such a large area. It's effectively caching intermediates, so that still counts in my book; just restricted to reasonably smooth functions :)
2017-04-01 02:36
Codey

Registered: Oct 2005
Posts: 79
I believe The Larch III The Larch 3 had a mega-DYPP in it. The same effect using a 1x1 charset and 8 splits per char without pre-plotting chars would take a massive amount of raster time. Plotting the bits in pairs resulting in 4 different Y positions per char still looks pretty impressive.
2017-04-01 11:26
Dr.Science

Registered: Oct 2011
Posts: 22
We are in 2017 and you are talking about keeping lamers out? Sounds like 1989... :-)
2017-04-01 13:36
ChristopherJam

Registered: Aug 2004
Posts: 652
Well, The Larch 3's from 1989, so I guess that fits at least..

But yeah, I think a somewhat more welcoming attitude to newbies is more important than ever.
Previous - 1 | 2 | 3 - Next
RefreshSubscribe to this thread:

You need to be logged in to post in the forum.

Search the forum:
Search   for   in  
All times are CET.
Search CSDb
Advanced
Users Online
Mermaid/Vision^G★P
Marq/Fit^Lieves!Tuor..
algorithm
TWW/Creators
EnzoPetscii
Acidchild/Padua
Didi/Laxity
DocSnyder
Guests online: 73
Top Demos
1 Uncensored  (9.7)
2 Edge of Disgrace  (9.7)
3 Coma Light 13  (9.6)
4 The Shores of Reflec..  (9.6)
5 Lunatico  (9.6)
6 Quad Core 100%  (9.5)
7 Comaland 100%  (9.5)
8 Incoherent Nightmare  (9.5)
9 Wonderland XII  (9.5)
10 Comaland  (9.5)
Top onefile Demos
1 Pandemoniac Part 2 o..  (9.6)
2 Synthesis  (9.6)
3 Dawnfall V1.1  (9.5)
4 Daah, Those Acid Pil..  (9.5)
5 Field Sort  (9.4)
6 Treu Love [reu]  (9.4)
7 Dawnfall  (9.3)
8 KAOS 64  (9.3)
9 Veterans of Style  (9.2)
10 One-Der  (9.2)
Top Groups
1 Booze Design  (9.4)
2 Censor Design  (9.4)
3 Oxyron  (9.4)
4 Crest  (9.3)
5 Finnish Gold  (9.3)
Top Coders
1 Axis  (9.8)
2 Crossbow  (9.8)
3 Graham  (9.8)
4 HCL  (9.8)
5 Lft  (9.7)

Home - Disclaimer
Copyright © No Name 2001-2017
Page generated in: 0.433 sec.