Homebrew WIP melonDS for Switch

Monti64 · May 26, 2019

Hydr8gon said:
I think the biggest thing for accuracy that can impact performance is timing. How long it takes to run an instruction, access memory, etc. and also synchronization between the 2 CPUs. Right now there's pretty much no timing system in place (the emulated CPUs are running too fast, basically) which could actually make performance worse because the processor has to keep up with the faster CPUs. Trying to make the timing too accurate though will also degrade performance, because of all the calculations and such required to figure out how fast everything should be running. I'll have to find some sort of balance between accuracy and speed. I also have a crazy idea or two that might help with performance, but it might mess up the synchronization, and I'm not sure how big of an impact that will have yet.

Regarding the audio/thread issue in melonDS, honestly I almost forgot about that because I've been so busy with this new emulator. It's also hard to debug because it doesn't happen on my end. I'll try to look into it again before releasing the hardware renderer update, but I can't make any promises. I've always found libnx threads to be a little wonky anyways; I've had issues with starting multiple threads on the same core and with getting them to run at all on the fourth core (which did work when I first released melonDS, but somewhere along the line something external broke it).

Either way, this will be a long project for you I assume after reading through the patreon page, and thanks for explaining!
The problem started after you fixed the dock audio, maybe you can make a version with the older threads if your time is to limited but I don't want to ask for too much

FanNintendo · May 26, 2019

Hydr8gon said:
I think the biggest thing for accuracy that can impact performance is timing. How long it takes to run an instruction, access memory, etc. and also synchronization between the 2 CPUs. Right now there's pretty much no timing system in place (the emulated CPUs are running too fast, basically) which could actually make performance worse because the processor has to keep up with the faster CPUs. Trying to make the timing too accurate though will also degrade performance, because of all the calculations and such required to figure out how fast everything should be running. I'll have to find some sort of balance between accuracy and speed. I also have a crazy idea or two that might help with performance, but it might mess up the synchronization, and I'm not sure how big of an impact that will have yet.

Regarding the audio/thread issue in melonDS, honestly I almost forgot about that because I've been so busy with this new emulator. It's also hard to debug because it doesn't happen on my end. I'll try to look into it again before releasing the hardware renderer update, but I can't make any promises. I've always found libnx threads to be a little wonky anyways; I've had issues with starting multiple threads on the same core and with getting them to run at all on the fourth core (which did work when I first released melonDS, but somewhere along the line something external broke it).

I have all day no worry

Arisotura · May 27, 2019

re: libnx threading

it might be using cooperative threading, like the 3DS, which means you need to make sure to give other threads a chance to run

on the 3DS, calling any syscall would have the side-effect of calling the scheduler and allowing other threads to run. I figure it's similar on the Switch, but dunno.

Billy Acuña · May 31, 2019

MelonDS 0.8 is out!

melonDS 0.8 is out! OpenGL renderer and upscaling!https://t.co/LLWrKv1rSf
— Arisotura (@Arisotura) May 31, 2019

Hydr8gon · May 31, 2019

Billy Acuña said:
MelonDS 0.8 is out!
https://mobile.twitter.com/Arisotura/status/1134583318664699904

Yep! I'll try to get the Switch version updated soon, hopefully by the end of the day.

Arisotura · May 31, 2019

looks like I was ninja'd :o

also, we need folks with AMD GPUs to test it, because I got reports that it's shitting itself

I have a small idea of what might be failing but I'd need confirmation (and if it's what I think, it would suck big time)

Arisotura · Jun 1, 2019

well, I figured it out, and pushed a hotfix

so if you had already downloaded it, pls redownload

tabnk · Jun 1, 2019

MelonDS (Without Dynamic ) 0.8 running 8x easily on desktop with dedicated GPU. Let's see how well it will run on NSwitch.

Hydr8gon · Jun 1, 2019

tabnk said:
MelonDS (Without Dynamic ) 0.8 running 8x easily on desktop with dedicated GPU. Let's see how well it will run on NSwitch.

Well, unfortunately the nouveau-based GPU drivers we have on the Switch weren't getting good performance with an early version of the renderer, so don't get your hopes too high, though hopefully it's improved with the current version. Also, I'm having some issues getting the current one working, so expect a release hopefully tomorrow. I should probably go to bed now~

tabnk · Jun 1, 2019

It will be bonus if it can run well on switch , otherwise play it on PC than.

. Or until Dynamic add to MelonDS at later development.

Hydr8gon said:
Well, unfortunately the nouveau-based GPU drivers we have on the Switch weren't getting good performance with an early version of the renderer, so don't get your hopes too high, though hopefully it's improved with the current version. Also, I'm having some issues getting the current one working, so expect a release hopefully tomorrow. I should probably go to bed now~

mattyxarope · Jun 1, 2019

Hydr8gon said:
Well, unfortunately the nouveau-based GPU drivers we have on the Switch weren't getting good performance with an early version of the renderer, so don't get your hopes too high, though hopefully it's improved with the current version. Also, I'm having some issues getting the current one working, so expect a release hopefully tomorrow. I should probably go to bed now~

Can't wait!

FanNintendo · Jun 1, 2019

that's awesome news still adding some improvement every time looking forward to it and will it be capable with 3.0.0?

Chrona · Jun 1, 2019

Exciting news

spotanjo3 · Jun 1, 2019

FanNintendo said:
that's awesome news still adding some improvement every time looking forward to it and will it be capable with 3.0.0?

You can always update it to the latest version with ChoiNX. I have a 3.0.0 and updated to 7.0.1. You can always downgrade it to 3.0.0 again with ChoiNX using 3.0.0 firmware folder.

FMCore · Jun 1, 2019

Hydr8gon said:
Well, unfortunately the nouveau-based GPU drivers we have on the Switch weren't getting good performance with an early version of the renderer, so don't get your hopes too high, though hopefully it's improved with the current version. Also, I'm having some issues getting the current one working, so expect a release hopefully tomorrow. I should probably go to bed now~

I noticed that a hot-fix was pushed today for melonDS, I assume that might've fixed the problem you were facing yesterday?

chaisea · Jun 2, 2019

Excited to see the new version ported :3.Keep up the good work seriously! I've started playing wild world on mine despite the lag haha.

FanNintendo · Jun 2, 2019

azoreseuropa said:
You can always update it to the latest version with ChoiNX. I have a 3.0.0 and updated to 7.0.1. You can always downgrade it to 3.0.0 again with ChoiNX using 3.0.0 firmware folder.

I would love to update to 7 but i already bricked my 1st one i dont want to lose 2nd or paying out for 3rd switch I am hoping that pegaswitch can solve all firmwares without jig or rcm do easy way may take longer maybe 4 years to figure out or never happen. Who knows

spotanjo3 · Jun 2, 2019

FanNintendo said:
I would love to update to 7 but i already bricked my 1st one i dont want to lose 2nd or paying out for 3rd switch I am hoping that pegaswitch can solve all firmwares without jig or rcm do easy way may take longer maybe 4 years to figure out or never happen. Who knows

You should backup nand. Didn't you ?

Csmrcc · Jun 2, 2019

FanNintendo said:
I would love to update to 7 but i already bricked my 1st one i dont want to lose 2nd or paying out for 3rd switch I am hoping that pegaswitch can solve all firmwares without jig or rcm do easy way may take longer maybe 4 years to figure out or never happen. Who knows

how can you brick it?

Hydr8gon · Jun 2, 2019

Well, here's a bit of an update I guess. I got the renderer working yesterday, but there are some strange issues with polygons randomly not rendering. We're looking into it, but it seems like it might be a driver bug. Regarding performance: it's about the same as the software renderer. In some cases it's a bit faster, while in others it's a bit slower. Also, I have some reworking to do so that the screen layouts and stuff will work with the new GL display method, though the polygon issue has a higher priority right now. Anyways, release will probably be delayed for a bit. The current source is up on my GitHub on the opengl branch though, if you wanna check it out. I just don't wanna officially release anything until it's working right.

((((And to plug my DS emulator NooDS for a second, I'm currently having some luck getting a few homebrews to run, so maybe we'll have that to fall back on in the future as a (hopefully) speedy DS emulator on the Switch??))))

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