Sonic and Sega Retro Message Board: Question about Sonic Jam - Sonic and Sega Retro Message Board

Jump to content

Hey there, Guest!  (Log In · Register) Help
Page 1 of 1
    Locked
    Locked Forum

Question about Sonic Jam

#1 User is offline Sodaholic 

Posted 09 April 2012 - 07:45 PM

  • Colony ship for sale, cheap!
  • Posts: 947
  • Joined: 05-September 04
  • Gender:Male
  • Location:Ohio
Since this is a technically oriented question, I've put it here instead of general.

How does Sonic Jam work exactly? I know that it's a port, and not emulation, but how exactly is the engine structured? How does it store the game assets? Most importantly, how are graphics handled? Is it bitmap based, or do they have some sort of tile renderer setup instead? How easily could one include high-color graphics, like using a 256 color palette instead of a 64 color palette? Has it ever been hacked before? If not, how easy would it be? Not that I have any intention of doing so, but it was just a curious question that popped into my head.

#2 User is offline Hivebrain 

Posted 09 April 2012 - 08:16 PM

  • Posts: 2411
  • Joined: 15-January 03
  • Gender:Male
  • Location:53.4N, 1.5W
  • Project:HivePal 2.0
  • Wiki edits:6,176
Graphics are stored as MD-style tiles and palettes, so you couldn't replace them with anything better than you would with an ordinary hack.

#3 User is offline Tiddles 

Posted 10 April 2012 - 03:52 AM

  • Diamond Dust
  • Posts: 439
  • Joined: 25-December 09
  • Gender:Male
  • Location:Nottingham, England
  • Project:Get in an accident and wake up in 1973
  • Wiki edits:31
I don't know much about the data structures apart from the pieces I stole, but I can say that the object layouts (at least for S3K) are in the same format. The S3 object layouts even use the different object IDs from that game rather than being based around the S3K ones.

The engine isn't encumbered by the same MD VDP limitations, so you might be able to make more interesting object layouts by jamming more sprites on screen. I couldn't say how well it performs in that case though. It'd be interesting to see if it's in any way affected by the classic place-a-billion-super-monitors-in-MHZ-and-break-them RAM corruption chicanery from the MD.

#4 User is offline Sik 

Posted 10 April 2012 - 04:20 AM

  • Sik is pronounced as "seek", not as "sick".
  • Posts: 6719
  • Joined: 17-March 06
  • Gender:Male
  • Project:being an asshole =P
  • Wiki edits:11

View PostTiddles, on 10 April 2012 - 03:52 AM, said:

It'd be interesting to see if it's in any way affected by the classic place-a-billion-super-monitors-in-MHZ-and-break-them RAM corruption chicanery from the MD.
I think pretty much all the bugs from the original games still remain in Sonic Jam.

#5 User is online ICEknight 

Posted 10 April 2012 - 04:36 AM

  • Posts: 8996
  • Joined: 11-January 03
  • Gender:Male
  • Location:Spain
  • Wiki edits:18
Something I've been wondering for some time now... Are the different versions of each game (Easy, original) stored as independent executables?

#6 User is offline Sodaholic 

Posted 10 April 2012 - 01:10 PM

  • Colony ship for sale, cheap!
  • Posts: 947
  • Joined: 05-September 04
  • Gender:Male
  • Location:Ohio
I just think it would be really cool if there were a disassembly. Imagine all the cool shit one could do. I think a really cool hack idea would be to strip it down to make each game standalone, and rewrite the renderer to use high-color bitmaps instead of low-color tiles. From that point, people could probably make some really cool hacks. Imagine a high-color Megamix, or maybe high-color S3C. It would be just like having the original Genesis games to edit, but so many more possibilities due to the more powerful hardware. I personally would prefer it as a platform for fangames than engines on the PC, as you could play it with real hardware and get real scanlines, and have perfect sync without needing to use v-sync. I would far prefer a fangame on the Saturn using a CRT with RGB input than one on the PC with an LCD screen.

#7 User is offline dsrb 

Posted 10 April 2012 - 01:21 PM

  • Posts: 3150
  • Joined: 10-June 09
  • Gender:Male
  • Wiki edits:196
But that's implying that you could get enough people who were (1) willing and (2) sufficiently good at programming the Saturn, a rather complex beast as far as console hardware goes.

Also, CRT display and scanlines are nice, but fangames on LCD don't look terrible (because computer-based scaling is much less crap than that of most TV sets), and I don't think many people are as concerned about sync 'issues' and suchlike as you are (no offence and all)--especially to the extent that they would move to developing for the Saturn.

-

Is Sonic & Knuckles Collection much different in this respect? Or is it, too, just a ported engine that uses the same formats for assets? (Me noob.)

#8 User is offline MainMemory 

Posted 10 April 2012 - 02:19 PM

  • Every day's the same old thing... Same place, different day...
  • Posts: 3209
  • Joined: 14-August 09
  • Gender:Not Telling
  • Project:SonLVL
  • Wiki edits:1,339
It's a ported engine with MIDI music (which has been replaced for high quality music already) and an emulated VDP.

#9 User is offline Sik 

Posted 12 April 2012 - 02:34 AM

  • Sik is pronounced as "seek", not as "sick".
  • Posts: 6719
  • Joined: 17-March 06
  • Gender:Male
  • Project:being an asshole =P
  • Wiki edits:11

View PostSodaholic, on 10 April 2012 - 01:10 PM, said:

I think a really cool hack idea would be to strip it down to make each game standalone, and rewrite the renderer to use high-color bitmaps instead of low-color tiles.
Would that fit in memory though? (remember that unlike the original games, everything needs to be pulled into RAM) A better idea would be to hack it so it can take advantage of the larger amount of palettes in the Saturn and use that to make more colorful graphics, even if each individual sprite is still limited to 15 colors (that was the whole deal with the SNES anyways...).

Page 1 of 1
    Locked
    Locked Forum

1 User(s) are reading this topic
0 members, 1 guests, 0 anonymous users