Homebrew RELEASE [Not really a release]DeSmuME with JIT

[catlover007]

Before this starts to rot on my hard drive, I'm going to release it.

Someone might have a use for this:
https://github.com/RSDuck/desmume-nx

Feel free to ask me any questions, but I'm probably not going to develope it further. If you're looking for a Nintendo DS emulator, you're probably better off using melonDS.

 

[angelhp]

Thanks for this port
Can you compilate the code ?
I want test it in my switch
Thanks...

 

[cyndor]

Thanks for this port
Can you compilate the code ?
I want test it in my switch
Thanks...

 

[arianadark]

does this work for anyone?

 

[Billy Acuña]

does this work for anyone?

It runs but really slow, I don't think the build above has JIT enabled or even OC.

 

[arianadark]

It runs but really slow, I don't think the build above has JIT enabled or even OC.

it just crashes the switch for me

 

[Billy Acuña]

it just crashes the switch for me

Ye, you need ypur roms on "/switch/desmume/roms/", or it will crash.

 

[catlover007]

It runs but really slow, I don't think the build above has JIT enabled or even OC.

It does have the JIT enabled and it overclocks the CPU to 1.2 GHz, though it currently spits tons of debug output and the JIT isn't very efficient. Also 3D games should only run marginally faster, because the main bottleneck for them is still the rasteriser and not the CPU

 

[catlover007]

So, I actually continued this. I optimised the JIT a bit and also ported the OpenGL renderer and it's still bad

EDIT: when I mean bad, I mean about 30 FPS with Mario Kart, full overclock and OGL renderer

 

[arianadark]

So, I actually continued this. I optimised the JIT a bit and also ported the OpenGL renderer and it's still bad

EDIT: when I mean bad, I mean about 30 FPS with Mario Kart, full overclock and OGL renderer

can set it so we can pick the oc speed?

 

[catlover007]

can set it so we can pick the oc speed?

no, this isn't meant as an end user ready product. I think haven't made it clear, the developement has now come to a point where there's not much possible anymore to improve the slow emulation speed.

If you want Nintendo DS emulation on your Switch, go with melonDS

 

[arianadark]

no, this isn't meant as an end user ready product. I think haven't made it clear, the developement has now come to a point where there's not much possible anymore to improve the slow emulation speed.

If you want Nintendo DS emulation on your Switch, go with melonDS

ok

 

[tabnk]

So, I actually continued this. I optimised the JIT a bit and also ported the OpenGL renderer and it's still bad

EDIT: when I mean bad, I mean about 30 FPS with Mario Kart, full overclock and OGL renderer

3DS game maybe slow but 2D games should be fine.

 

[TheMrIron2]

3DS game maybe slow but 2D games should be fine.

Not necessarily. As someone who worked on DSonPSP, I ran into an interesting issue where 3D games would in theory actually run better than 2D games because the 3D games can have more hardware GPU assistance than 2D games, in which the latter have everything done on the CPU because modern GPUs don't deal with sprites and the like anymore.
Edit: Not saying the Switch is this badly bottlenecked, but 2D games do not necessarily run better - the CPU does more work with 2D games, and for 3D games the GPU can take all graphics workload without breaking a sweat.

 

[catlover007]

Not necessarily. As someone who worked on DSonPSP, I ran into an interesting issue where 3D games would in theory actually run better than 2D games because the 3D games can have more hardware GPU assistance than 2D games, in which the latter have everything done on the CPU because modern GPUs don't deal with sprites and the like anymore.
Edit: Not saying the Switch is this badly bottlenecked, but 2D games do not necessarily run better - the CPU does more work with 2D games, and for 3D games the GPU can take all graphics workload without breaking a sweat.

The problem lies in the way DeSmuME handles the 3D, atleast in the newest version. It constantly transfers things from main memory to VRAM and back. And in the end it still does expensive operations like window testing are on the CPU.