Homebrew mGBA official standalone Wii port

the_randomizer · Aug 30, 2015

VinsCool said:
Timing in sound stream, sample rate or general optimisations are what I think is related to this issue

I meant, in the actual source files themselves, if you go back a page, the person who compiled yesterday's build mentioned something about adjusting the latency, i think?

Edit: Post 25 actually http://gbatemp.net/threads/mgba-official-standalone-wii-port.395240/page-2#post-5642038

VinsCool · Aug 30, 2015

the_randomizer said:
I meant, in the actual source files themselves, if you go back a page, the person who compiled yesterday's build mentioned something about adjusting the latency, i think?

Edit: Post 25 actually http://gbatemp.net/threads/mgba-official-standalone-wii-port.395240/page-2#post-5642038

So I guess it's related to timing with sound buffer

the_randomizer · Aug 30, 2015

VinsCool said:
So I guess it's related to timing with sound buffer

Which i don't know how to edit or compile, there's no wiki guide on how to compile a .dol file from source lol.

VinsCool · Aug 30, 2015

the_randomizer said:
Which i don't know how to edit or compile, there's no wiki guide on how to compile a .dol file from source lol.

Where is the source code? I'm just curious, I suck at programming xD

the_randomizer · Aug 30, 2015

VinsCool said:
Where is the source code? I'm just curious, I suck at programming xD

I assume somewhere on here https://github.com/mgba-emu might want to ask how to compile it using the libogc (I think) though

VinsCool · Aug 30, 2015

the_randomizer said:
I assume somewhere on here https://github.com/mgba-emu might want to ask how to compile it using the libogc (I think) though

But I was talking about the stand alone wii port though.

the_randomizer · Aug 30, 2015

VinsCool said:
But I was talking about the stand alone wii port though.

Isn't that where the source is......? I'd ask @zerofalcon that, I don't know.

zerofalcon · Aug 30, 2015

Source code:
https://github.com/mgba-emu/mgba

Yes, the problem with the sound is related to the audio rate, if this can be improved in retroarch I'm sure it'll fix almost completely that annoying crackling sound (game dependant of course)... Too bad large GBA roms (32 mb) are not working with the libretro core anymore.

the_randomizer · Aug 30, 2015

zerofalcon said:
Source code:
https://github.com/mgba-emu/mgba

Yes, the problem with the sound is related to the audio rate, if this can be improved in retroarch I'm sure it'll fix almost completely that annoying crackling sound (game dependant of course)... Too bad large GBA roms (32 mb) are not working with the libretro core anymore.

Seriously? So there's no point in even porting this for Libretro? I was curious if the audio rate can be adjusted manually, like as an emulator option for testing purposes.

zerofalcon · Aug 30, 2015

I tried lower audio rate from 48000 to 32000 khz with no success, if going lower (22050) the audio becomes distorted. I'm searching right now how to configure another audio setting.
About the libretro core, I hope the devs fix the issue with large roms, because any gba core available for wii it's not working with 32 mb files.

the_randomizer · Aug 30, 2015

zerofalcon said:
I tried lower audio rate from 48000 to 32000 khz with no success, if going lower (22050) the audio becomes distorted. I'm searching right now how to configure another audio setting.
About the libretro core, I hope the devs fix the issue with large roms, because any gba core available for wii it's not working with 32 mb files.

Is it possible to adjust the frequency in values of one Hz? I remember Snes9x GX having that issue same issue, and using a value of 31850 Hz seemed to remove all crackling. Audio buffering would be the next one to try, if it's there, usually measured in milliseconds, IDK if that can be adjusted.

Wiimpathy · Aug 30, 2015

zerofalcon said:
Source code:
https://github.com/mgba-emu/mgba

Yes, the problem with the sound is related to the audio rate, if this can be improved in retroarch I'm sure it'll fix almost completely that annoying crackling sound (game dependant of course)... Too bad large GBA roms (32 mb) are not working with the libretro core anymore.

Can you explain how you compiled it? I had no problem with libretro core, but no luck with the standalone and that cmake.

the_randomizer · Aug 30, 2015

Wiimpathy said:
Can you explain how you compiled it? I had no problem with libretro core, but no luck with the standalone and that cmake.

Seconded, it would be good to know how it was done.

zerofalcon · Aug 30, 2015

Wiimpathy said:
Can you explain how you compiled it? I had no problem with libretro core, but no luck with the standalone and that cmake.

I'm using CMake 3.3.1 on Linux, after having installed, open a shell prompt, navigate to mgba source root directory, then, (mgba author instructions)

mkdir wii && cd wii
cmake .. -DCMAKE_TOOLCHAIN_FILE=../src/platform/wii/CMakeToolchain.txt -G "Unix Makefiles"
make

after finished you will have a mgba.dol on wii folder.

the_randomizer · Aug 30, 2015

zerofalcon said:
I'm using CMake 3.3.1 on Linux, after having installed, open a shell prompt, navigate to mgba source root directory, then, (mgba author instructions)

mkdir wii && cd wii
cmake .. -DCMAKE_TOOLCHAIN_FILE=../src/platform/wii/CMakeToolchain.txt -G "Unix Makefiles"
make

after finished you will have a mgba.dol on wii folder.

Nice, I think if I wanted to compile this, I'd need to install a Linux VM since I'm on Windows. I wonder, though, if Snes9x Next could have a standalone emulator

Thanks

Wiimpathy · Aug 30, 2015

Thanks. There were Cmake files left interfering, due to a previous linux build. And there's no simple "make clean" with cmake. Compiling late at night doesn't help either.

Anyway, the standalone runs pretty well indeed. The libretro core has bad performance in comparison, not sure why.

the_randomizer · Aug 30, 2015

Wiimpathy said:
Thanks. There were Cmake files left interfering, due to a previous linux build. And there's no simple "make clean" with cmake. Compiling late at night doesn't help either.

Anyway, the standalone runs pretty well indeed. The libretro core has bad performance in comparison, not sure why.

That's...also quite weird, and I'm sure it's simple enough to fix...I think? I know it's still an alpha build but that is baffling

zerofalcon · Aug 30, 2015

Wiimpathy said:
Thanks. There were Cmake files left interfering, due to a previous linux build. And there's no simple "make clean" with cmake. Compiling late at night doesn't help either.

Anyway, the standalone runs pretty well indeed. The libretro core has bad performance in comparison, not sure why.

I was playing/testing with mGBA windows version and I think I finally found where lies the problem with the crackling audio, at least with the libretro core... not sure if the standalone port will increase performance. I'm going to make a new repository on github, fork the project and edit the corresponding file for Wii optimization, I dont know if it make sense to make a pull request because this setting maybe will cause issues to other libretro platforms, but for the Wii core it will work wonders. off-topic: retroarch for Wii now have HID support! very nice!

the_randomizer · Aug 30, 2015

zerofalcon said:
I was playing/testing with mGBA windows version and I think I finally found where lies the problem with the crackling audio, at least with the libretro core... not sure if the standalone port will increase performance. I'm going to make a new repository on github, fork the project and edit the corresponding file for Wii optimization, I dont know if it make sense to make a pull request because this setting maybe will cause issues to other libretro platforms, but for the Wii core it will work wonders. off-topic: retroarch for Wii now have HID support! very nice!

Whoa, HID support?? Where did that come from? Not that I'm complaining, but dayum that's really cool! And now you figured out what's causing the audio crackle, it is related to the audio buffer size in any way? If the RA version can be fixed, the standalone port should be able to do the same, I think

zerofalcon · Aug 30, 2015

Exactly, it's related to the audio buffer samples and I guess lowering the sample rate helps a little bit. Idle loops optimizations should work if configuring correctly but I dont know exactly what values are needed to change this. A funny thing I noticed (libretro core) with Final Fantasy IV Advance: if using a bios file (gba_bios.bin) the game becomes laggy in certain areas (intro after Square Enix and right after starting a new game), and here's the weird part, if using HLE bios (no gba_bios.bin file) the game simply runs faster, a little to none crackling and lagging. But for most games I tested running with a bios file they run almost perfect (98-100%). The sad part? 32 mb roms are not working in retroarch and I hope this gets fixed soon.

Edit: mGBA Wii standalone port now supports tilt sensor and in-progress gyroscope. This is getting better and better.

Homebrew mGBA official standalone Wii port

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