[GC] F-Zero GX (Official Thread)

[isamu]

Originally Posted by Nintendo Maniac

Um, not to be picky, but this isn't upscaling, this is what's called "rendering at a higher resolution" :P (upscaling would be if you rendered at like 640x480 and then enlarged the on-screen image to 1024x768 without changing the actual rendering resolution)

From what I understand, the game goes far enough in to get to most everything but the actual racing. You can load a track, but as soon as the countdown is over, all goes haywire. (I can't test this out myself since my cpu doesn't support SSE2)

Ah thanks for the clarification

So, is NeoSlider one of the people working on cracking the TLB problem? Any progress on getting it implemented?

Also, does Triforce use TLB? If not, would it be easier to emulate F-ZeroAX instead?

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[ector]

It probably isn't a TLB problem - the TLBHack seems to have been enough to get around that. It's an FPU emulation problem - just like in the Super Monkey Ball games (the games seems to use exactly the same totally bizarre math library).

[John Peterson]

Originally Posted by isamu

Also, does Triforce use TLB? If not, would it be easier to emulate F-ZeroAX instead?

I would guess that the arcade version use both TLB and floating point registers in a similar way as the console version, if the hardware is similar. But I'm not sure.

What I can gather from the GameCube version right now is that the problem is not primarily the use of any translation lookaside buffer but rather the unsupported floating point registers. I think ector patched all functions that used the mffsx instruction, but there are still unpatched mcrfs instructions. That means that when the game passes by a mcrfs instruction the code may go wrong shortly after that since mcrfs may have read incorrect register values.

As I see it fixing the FPSCR values in Interpreter_FloatingPoint.cpp so that they are set in the correct way would fix the game. But the reason they don't work is because they are hard to fix. However, I thought that the PowerPC emulator PearPC had working interpreter functions for those instructions, but I may be wrong about that.

[MisterMr]

Dolphin doesn't support floating point registers yet, so no, you won't be able to actually race until that is emulated.

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[isamu]

Originally Posted by MisterMr

Dolphin doesn't support floating point registers yet, so no, you won't be able to actually race until that is emulated.

Thanks for the clarification MisterMr(great band btw. Saw them Live last year).

So can you tell me if this floating point thingamajig is being worked on, and when do you suspect it will be emulated?

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[nosound.97]

Originally Posted by isamu

So can you tell me if this floating point thingamajig is being worked on, and when do you suspect it will be emulated?

I don't think it is right place. Go to Dolphin Google-code page, find this issue and ask about devs about it. I bet they'll answer.

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[ector]

Tracking it here: Issue 546 - dolphin-emu - Floating point math errors (F-Zero, Super Monkey Ball 1/2/Wii) - Google Code

[MisterMr]

Originally Posted by isamu

Thanks for the clarification MisterMr(great band btw. Saw them Live last year).

Lol too bad I didn't choose my username because of the band lol

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[Nintendo Maniac]

Wait, how did you get it to stretch to widescreen AND render in hi-res? When you check the "stretch to fit" box or whatever it's called, it renders using the original 640x480 res. But if you leave it unchecked, games are stuck at 4:3, aren't they? That would mean that widescreen on F-Zero GX would be smooshed into a 4:3 ratio, no?

(unfortunatly I cannot test this out myself since I have no idea where to find the debugger window to disable "JIT LoadStore lwz")

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[nosound.97]

Originally Posted by Nintendo Maniac

(unfortunatly I cannot test this out myself since I have no idea where to find the debugger window to disable "JIT LoadStore lwz")

In command like where DolphinWx located write "DolphinWx -d" at the end and you will get debugger. Then run game, choose "Dolphin-Debugger" window and then disable "JIT LoadStore lwz". Then choose play and here we go.

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[Nintendo Maniac]

Thanks!... too bad I'll have to wait until next weekend to have access to a PC that can run Dolphin.

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Last edited by Nintendo Maniac; February 8th, 2009 at 21:06..

[nosound.97]

If you're not sure here's pic

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[NeoSlider]

Originally Posted by Nintendo Maniac

Wait, how did you get it to stretch to widescreen AND render in hi-res? When you check the "stretch to fit" box or whatever it's called, it renders using the original 640x480 res. But if you leave it unchecked, games are stuck at 4:3, aren't they? That would mean that widescreen on F-Zero GX would be smooshed into a 4:3 ratio, no?

(unfortunatly I cannot test this out myself since I have no idea where to find the debugger window to disable "JIT LoadStore lwz")

Correct, the widescreen image was squashed into 4:3 in hi-res then I used a editing program to make the screenshot the correct ratio. If you just use stretch to fit and take a shot of that, it looks nowhere near as good! Hopefully someone, one day will implement a hi-res stretch to fit mode!

If you use the 64bit version you don't need to disable JIT LoadStore lwz or anything else, just use the TLBHack and the game will run.

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[Nintendo Maniac]

Oh, really? I'm always using the 64 bit version since there are quite the "uber PCs" I test dolphin on (quad core, 6 to 8 GB or RAM, etc)

Unless I'm doing something wrong with the TLB Hack, I still always got a lock-up at the Sega-AV logo. All I'm doing is putting the following line under [Core] in Dolphin.ini:

TLBHack = 1

This is correct, isn't it?

EDIT: Wait, I would also disable "JIT...something" in the configuration since I originally thought that's what you meant by "JIT LoadStore lwz". So maybe having that off makes F-Zero GX never boot? Man I really wish I talked about this BEFORE I did my testing oppurtunity >_<

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CPU: Athlon XP 2100+ OC'd @ 2GHz (lacks support for SSE2)
GPU: Radeon 9600 256MB AGP OC'd @ 420 core : 200 mem
RAM: 512MB DDR + 256MB DDR
OS: Windows XP Pro SP3

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Last edited by Nintendo Maniac; February 9th, 2009 at 03:01..

[IOmega666]

TLBHack

maybe ? .

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[Nintendo Maniac]

Look again, I corrected that typo :P

I copied the text for the settings in the first post into a .txt so I can remember what settings to use for F-Zero GX. Then for the TLBHack I always just copy and paste that line into the Dolphin.ini file to make sure it's exactly right.

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[IOmega666]

Maybe its

TLBHack=1

And no TLBHack = 1

Gotcha ?

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[Nintendo Maniac]

But everything else in Dolphin.ini has a spaces around the = sign...

Here's a small snippet:

LEBios = True
UseDynarec = True
UseDualCore = False
SkipIdle = True
LockThreads = True

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[MisterMr]

I think F-Zero GX is gonna be at a playable state soon along with other FPR games. Due to the fact that when you go to the Google Code page for Dolphin, I can skim through and see a lot of work being done for floating point.

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[isamu]

Originally Posted by MisterMr

I think F-Zero GX is gonna be at a playable state soon along with other FPR games. Due to the fact that when you go to the Google Code page for Dolphin, I can skim through and see a lot of work being done for floating point.

Yeah, that would absolutely fantastic if he can resolve that issue. I await that fruitful day with baited breath

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GENTLEMEN: START YOUR ENGINES!!

Daytona USA is emulated for the PC.

*NOTHING more needs to be said*