Decent port of Street Fighter II possible? - Page 7

DanScott · 17 June 2019, 17:39

Quote:

Originally Posted by zero

I think you underestimate the amount of game logic in SF-II. It's got some kind of scripting engine and I believe it does all the hit detection logic even for skipped frames.

https://sf2platinum.wordpress.com/

I think you are overestimating the complexity of that system

Honestly, that's a really simple system, and quite easy to code efficiently

Just a simple scripted state-machine...

zero · 17 June 2019, 17:56

So for each frame it

- Runs the script engine
- Calculates animation frames, which are also scripted
- Calculates movement
- Does hit detection

In the highest turbo mode it does that at 120Hz, i.e. twice per rendered frame.

And on the Amiga it also has to

- Control the blitter
- Play the music and sound effects
- Read the player's inputs, including complex move detection like the fireball motion
- Do any graphical flipping required if RAM constrained

I think it's a tall order. The blitter is stealing a lot of memory access cycles, if you want more than 16 colours then so is DMA. At least on the A1200 you have an instruction cache and 2MB RAM, but even then...

sandruzzo · 21 June 2019, 18:44

Quote:

Originally Posted by zero

So for each frame it

- Runs the script engine
- Calculates animation frames, which are also scripted
- Calculates movement
- Does hit detection

In the highest turbo mode it does that at 120Hz, i.e. twice per rendered frame.

And on the Amiga it also has to

- Control the blitter
- Play the music and sound effects
- Read the player's inputs, including complex move detection like the fireball motion
- Do any graphical flipping required if RAM constrained

I think it's a tall order. The blitter is stealing a lot of memory access cycles, if you want more than 16 colours then so is DMA. At least on the A1200 you have an instruction cache and 2MB RAM, but even then...

If you reduce screen area and bob's size you'll have all the cicles that you need.

DanScott · 22 June 2019, 01:52

Quote:

Originally Posted by sandruzzo

If you reduce screen area and bob's size you'll have all the cicles that you need.

Awaiting your demo showcasing this feat....

however, reduce screen size and bob size, and it's no longer Street Fighter

Retro1234 · 22 June 2019, 12:26

Street Fighter 2 Arcade uses scripts for AI

https://sf2platinum.wordpress.com/20...the-ai-engine/

dlfrsilver · 22 June 2019, 16:32

yes, and the game logic is running while the GPU takes care of the display !

Retro1234 · 22 June 2019, 18:04

Quote:

Originally Posted by dlfrsilver

yes, and the game logic is running while the GPU takes care of the display !

So have to have a go at ripping that data also need some Graphic rips.

sandruzzo · 23 June 2019, 07:27

Quote:

Originally Posted by DanScott

Awaiting your demo showcasing this feat....

however, reduce screen size and bob size, and it's no longer Street Fighter

A ok. But a few pixel less don't hurt the game!

I did a small demo to test if it's possibile to make it run at 50 hz, and it does!

AmigaHope · 15 July 2019, 10:26

I'd personally be happy with a 1:1 SF2 conversion that ran the original code for the core gameplay, with the only changes to the code being in I/O, graphics, and sound. It obviously would not run on a stock A500 but might be doable on 68030+AGA+Lots of fast RAM.

Sort of like how Super Mario Bros. got ported to the C64. The graphics were adapted to the C64's chipset, but the core game code is pure straight from the Nintendo original. It doesn't run full-speed on a stock C64, but with a Turbo Chameleon or a SuperCPU it runs more or less 1:1 perfectly, the only giveaway that it's on a C64 coming from the lower horizontal resolution.

dlfrsilver · 15 July 2019, 13:51

yes i agree with this. Our best coders have the knowledge to use the original arcade code patched to run on AGA + 68030 + Lots of fast RAM + Hard drive PFS3AIO.

Faserone · 02 August 2019, 07:58

Original SSF2T arcade rom full size character animation on AMOS

[ Show youtube player ]

[ Show youtube player ]

[ Show youtube player ]

Original game music full 16 channels but slows down in full screen. As shown by seko, could be done on 3 or 4 channels with good results.

[ Show youtube player ]

zero · 02 August 2019, 11:08

Nice work. How much RAM are you using for that sprite?

4 channels of audio turned out to be a bit of a bottleneck. Seemed incredible at the time but if you need two channels for sound effects (one per player) then two for music is a bit thin. Could still sound decent.

dlfrsilver · 02 August 2019, 12:16

Ryu on CPS2 takes 1,1mb of rom with around 400-500 frames.

zero · 02 August 2019, 15:09

Quote:

Originally Posted by dlfrsilver

Ryu on CPS2 takes 1,1mb of rom with around 400-500 frames.

Are you use? I just checked the CPS-2 ROM and it's 7 MB of data, assuming each chip is 100% full. That includes all the sound and graphics for stages etc, plus 12 characters.

For confirmation the near arcade perfect PC Engine version is an 8MB ROM.

If Ryu alone was 1.1MB then there is no way all that would fit into 7MB of total ROM.

dlfrsilver · 02 August 2019, 17:41

Quote:

Originally Posted by zero

Are you use? I just checked the CPS-2 ROM and it's 7 MB of data, assuming each chip is 100% full. That includes all the sound and graphics for stages etc, plus 12 characters.

For confirmation the near arcade perfect PC Engine version is an 8MB ROM.

If Ryu alone was 1.1MB then there is no way all that would fit into 7MB of total ROM.

Everything is stored as tiles. The CPS-2 rip of Ryu of 1,1mb. Otherwise stored as tiles, Ryu is 850ko alone.

Each character has a different size. one stage is around 120kb.

SSF2 CPS2 is a 12mb game (GFX+SOUND ROMS+CODE)

saimon69 · 02 August 2019, 18:11

Quote:

Originally Posted by zero

Nice work. How much RAM are you using for that sprite?

4 channels of audio turned out to be a bit of a bottleneck. Seemed incredible at the time but if you need two channels for sound effects (one per player) then two for music is a bit thin. Could still sound decent.

In the right hands (not necessarily mine) decent results are possible, of course with some compromises...

[ Show youtube player ]

Retro1234 · 02 August 2019, 18:17

Do you have these CPS graphics?

dlfrsilver · 02 August 2019, 19:46

Quote:

Originally Posted by Retro1234

Do you have these CPS graphics?

Well no, i would need to crawl inside the CPS2 arcade code for that.

Better use a custom tool, validating each sprite frame and then export.

Retro1234 · 02 August 2019, 20:25

Quote:

Originally Posted by dlfrsilver

Well no, i would need to crawl inside the CPS2 arcade code for that.

Better use a custom tool, validating each sprite frame and then export.

Have you got any Character sprites stored in Tiles I'd like to see it

I also heard the Neo Geo stores Sprites like this.

dlfrsilver · 02 August 2019, 20:34

Quote:

Originally Posted by Retro1234

Have you got any Character sprites stored in Tiles I'd like to see it

I also heard the Neo Geo stores Sprites like this.

I have not started anything, a tool is needed to get all you want without spending tons of hours to get them.

02 August 2019, 18:17	#137
Retro1234 Phone Homer Join Date: Jun 2006 Location: 5150 Posts: 5,808	Do you have these CPS graphics? Last edited by Retro1234; 02 August 2019 at 18:23.

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17 June 2019, 17:56	#122
zero Registered User Join Date: Jun 2016 Location: UK Posts: 428	So for each frame it - Runs the script engine - Calculates animation frames, which are also scripted - Calculates movement - Does hit detection In the highest turbo mode it does that at 120Hz, i.e. twice per rendered frame. And on the Amiga it also has to - Control the blitter - Play the music and sound effects - Read the player's inputs, including complex move detection like the fireball motion - Do any graphical flipping required if RAM constrained I think it's a tall order. The blitter is stealing a lot of memory access cycles, if you want more than 16 colours then so is DMA. At least on the A1200 you have an instruction cache and 2MB RAM, but even then...

22 June 2019, 12:26	#125
Retro1234 Phone Homer Join Date: Jun 2006 Location: 5150 Posts: 5,808	Street Fighter 2 Arcade uses scripts for AI https://sf2platinum.wordpress.com/20...the-ai-engine/

22 June 2019, 16:32	#126
dlfrsilver CaptainM68K-SPS France Join Date: Dec 2004 Location: Melun nearby Paris/France Age: 46 Posts: 10,505	yes, and the game logic is running while the GPU takes care of the display !

15 July 2019, 10:26	#129
AmigaHope Registered User Join Date: Sep 2006 Location: New Sandusky Posts: 944	I'd personally be happy with a 1:1 SF2 conversion that ran the original code for the core gameplay, with the only changes to the code being in I/O, graphics, and sound. It obviously would not run on a stock A500 but might be doable on 68030+AGA+Lots of fast RAM. Sort of like how Super Mario Bros. got ported to the C64. The graphics were adapted to the C64's chipset, but the core game code is pure straight from the Nintendo original. It doesn't run full-speed on a stock C64, but with a Turbo Chameleon or a SuperCPU it runs more or less 1:1 perfectly, the only giveaway that it's on a C64 coming from the lower horizontal resolution.

15 July 2019, 13:51	#130
dlfrsilver CaptainM68K-SPS France Join Date: Dec 2004 Location: Melun nearby Paris/France Age: 46 Posts: 10,505	yes i agree with this. Our best coders have the knowledge to use the original arcade code patched to run on AGA + 68030 + Lots of fast RAM + Hard drive PFS3AIO.

02 August 2019, 07:58	#131
Faserone Registered User Join Date: May 2018 Location: Belgium Posts: 4	Original SSF2T arcade rom full size character animation on AMOS [ Show youtube player ] [ Show youtube player ] [ Show youtube player ] Original game music full 16 channels but slows down in full screen. As shown by seko, could be done on 3 or 4 channels with good results. [ Show youtube player ]

02 August 2019, 11:08	#132
zero Registered User Join Date: Jun 2016 Location: UK Posts: 428	Nice work. How much RAM are you using for that sprite? 4 channels of audio turned out to be a bit of a bottleneck. Seemed incredible at the time but if you need two channels for sound effects (one per player) then two for music is a bit thin. Could still sound decent.

02 August 2019, 12:16	#133
dlfrsilver CaptainM68K-SPS France Join Date: Dec 2004 Location: Melun nearby Paris/France Age: 46 Posts: 10,505	Ryu on CPS2 takes 1,1mb of rom with around 400-500 frames.

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