DesMuMe mods !!!

[shashClp]

Originally Posted by NHervé

PS2 : shash : When I commented the code of the 2d core, the music of the menu of New Super Mario Bros was running faster, and the FPS was around 20-30.

Well, I don't consider that a good profiling system. On my debugging sessions the 2D core wasn't the most relevant bottleneck, the opcode prefetching, decoding and interrupt handling was. Of course, that was long ago with the 2D core, after I committed the "new" blitter system. On my own version, I've never seen the 2D core to get more than the 10% of the execution time, wether the memory and cpu emulation are most of the time up to 40%, thus I spent more time fixing that. For example, on Castlevania I get 2x the official version framerate. With other games I always get comparable or better speed than other emulators whenever 3D is shown. I'll do a more thorough post about the optimizable targets and a comparison with current released emulators whenever I've time, I'll keep you informed. The important point is that I never needed to touch the 2D core, but any optimization is welcome, even if it isn't the main target to optimize, imho.

Anyway, whenever you release it I'll profile it properly and compare with the official 2D core to see the perfomance differences, and commit it to the official CVS. You'll understand that I need to review changes to the official CVS even if they come from a reputed coder, I don't want to offend you

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Last edited by shashClp; February 11th, 2008 at 21:54..

[refraction]

I have to agree with the profiling comments. What youve described about commenting ou tthe 2d core and the music ran faster, this is bound to happen. Everything thats being used takes processing power, so cutting that processing power out will free it up for other parts to use, but it doesnt mean that code is slow, it just means its working

its like in a game on the pc, saying AA is slow cos you put it on AAx4 and your frame rate reduces, but you turn it off and it goes loads faster, its nothing to do with AA performance, its more than likely that performance is at a peak with the AA, its the fact its not being used when you turn it off.

IF it does make a difference over the official 2d core it would be good to see it run. im all for the "every little helps" frame of mind, much like saving up pennies for a rainy day :P

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[dreampeppers99]

I'll do a more thorough post about the optimizable targets and a comparison with current released emulators whenever I've time, I'll keep you informed.

Great

and commit it to the official CVS.

Good, movement on DeSmume project.

[Luigi__]

Okay.
I've now implemented horizontal&vertical scrolling.

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[dreampeppers99]

NHervé good news!!!
Keep the great work.

[Luigi__]

shash : I would like to know how did you implement the gxfifo irq, and where I can download the latest source code.

thanks in advance.

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[SKJmin]

Could someone help to start the mod...
It says "SDL.dll nor found"...
I'm using WIN XP PRo (32-Bit)

How can I start that thing^^
THX in advance


Edit/ OK fixed

[shashClp]

Originally Posted by NHervé

shash : I would like to know how did you implement the gxfifo irq, and where I can download the latest source code.

thanks in advance.

Latest source code is in the official CVS. The gfxfifo is documented here. The 3D core works with a normal FIFO which can trigger interrupts depending on the mode (bits 30-31 of the GXSTAT). There's no secret on it.

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[Luigi__]

It seems DesMuMe has a wrong bios. In effect, in New Super Mario Bros, the mini-games don't work. When you select them, the game calls funcs in bios. I've constated that the values shown by the disassembler are diferent from the values shown by NeonDS. And the mini-games work with NeonDS. So I think DesMuMe has a wrong bios.

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Luigi__'s website (new one - under construction) - If you're wondering where Mario__ is, he is currently saving Peach__ once again.

[shashClp]

Originally Posted by NHervé

It seems DesMuMe has a wrong bios. In effect, in New Super Mario Bros, the mini-games don't work. When you select them, the game calls funcs in bios. I've constated that the values shown by the disassembler are diferent from the values shown by NeonDS. And the mini-games work with NeonDS. So I think DesMuMe has a wrong bios.

Yep, I've been wanting to make a proper BIOS dump loader so I could see the differences between the real bios and the HLEd one, but I never got to make it (lately I've only worked on speed related fixes, not many "new" things done). I'll check whenever I can and tell you the results, if you want to

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[Luigi__]

yes. Are the mini-games working with your DesMuMe ? I've seen you can play New Super Mario Bros with it. If you can play the mini-games, how did you get them to work ?
If not, this HLEd bios could be the problem.

PS : I'm currently working on implementing RTC.

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[shashClp]

Originally Posted by NHervé

yes. Are the mini-games working with your DesMuMe ?
I've seen you can play New Super Mario Bros with it. If you can play the mini-games, how did you get them to work ?
If not, this HLEd bios could be the problem.

Just checked, they don't work. I'll debug later, and see what's the problem.

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[Luigi__]

Okay. I'm sure the problem is this **** of HLEd bios. NeonDS has a proper bios and it is able to run the mini-games. I'm trying to rewrite bios irq handler according Nocash specs.

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[shashClp]

Just looked a bit at the issue, it seems it's related to a DMA failing or not copying data. Afaik, it has nothing to do with the bios, as it's jumping where it should :P

EDIT: It CAN'T be a DMA, because the uninitialized area it the ARM9 ITCM. For some unknown reason, whatever should be copied there, isn't, so it's failing

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Last edited by shashClp; February 17th, 2008 at 21:25..

[Luigi__]

ah okay. So DMAs are buggy.

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[shashClp]

Originally Posted by NHervé

ah okay. So DMAs are buggy.

No, read my edit, due to the uninitialized area being the ITCM, it CAN'T be a DMA, as the DMA can't access ITCM (atleast that's what I read in the gbadev forums). Here's a reference, I'll test it ASAP. Else, just search gbadev forums for the ITCM for more info :P

EDIT: I would bet that's it's something with the ITCM not being initialized correctly, atleast that's what's differing with Ideas and NeonDS. Well have to figure it out (preferred one), or ask to the NeonDS author to add an Step/Breakpoint functionality (lazy option) :P

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Last edited by shashClp; February 18th, 2008 at 08:21..

[Luigi__]

Ah okay, I'll see why ARM9 ITCM is not properly copied. I've provided a snapshot, you are right, I've loaded the game and updated the disassemblers, the ARM7 one shows opcodes, whereas the ARM9 one shows lines of "0x00000000 andeq r0, r0, r0" and nothing other, so ITCM is not initialized.

Attached Images

desumme_wrong_itcm.JPG (154.5 KB, 19 views)

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[Luigi__]

I've noticed it's the game which writes ITCM, and the problem is DesMuMe thinks the game is writing in DTCM. Thanks to NeonDS.

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[shashClp]

Oh, hell, I'll test my version today adding a proper patch for that, I'll tell you the results. By the way, I'll update the CVS this night with some interesting fixes on the CPU, which I guess you'll already have.

Thanks for the information

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[dreampeppers99]

Some move on DesMuMe project....

Originally Posted by shashClp

I'll update the CVS this night with some interesting fixes on the CPU

Seeing the CVS browser:
10 days shashclp - Fix for homebrews that never setup the screens. It's how it's meant to be on D...