| Any better way to stop Mednafen from updating mednafen.cfg when passing settings via command line? [message #6873] |
Tue, 11 April 2023 05:41  |
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I've been using Mednafen with a VR headset to play Virtual Boy games in 3D, so I've set up a batch file for launching Virtual Boy games via drag-and-drop. Since there's currently no way to manually load custom config files (as far as I can tell, at least - I couldn't find anything in the documentation), this batch file passes settings manually via command line arguments:
%~dp0mednafen -vb.3dmode sidebyside -vb.sidebyside.separation 43 -vb.stretch 0 -vb.xscalefs 3 -vb.yscalefs 6 -video.fs 1 %1
However, it seems that Mednafen takes these arguments and updates mednafen.cfg with them. It makes the whole point of passing settings via command line kind of useless, and a real pain.
I'm currently working around this issue by backing up the config to a backup folder ("cfgbak") before running Mednafen, and then restoring the config file after I'm done playing, like so:
copy %~dp0mednafen.cfg %~dp0cfgbak
%~dp0mednafen -vb.3dmode sidebyside -vb.sidebyside.separation 43 -vb.stretch 0 -vb.xscalefs 3 -vb.yscalefs 6 -video.fs 1 %1
pause
copy %~dp0cfgbak\mednafen.cfg %~dp0
That said, there's a few solutions that would make this a lot better.
- Allow for config files to be manually loaded via command line.
- Prevent Mednafen from updating mednafen.cfg with settings that have been passed through via command line.
- Add a setting to enable or disable Mednafen's ability to automatically update mednafen.cfg upon closing.(This would probably necessitate a prompt to confirm whether to save settings upon closing.)
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| Re: Any better way to stop Mednafen from updating mednafen.cfg when passing settings via command lin [message #6874 is a reply to message #6873 ] |
Tue, 11 April 2023 14:03  |
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| Quote: |
[...] Since there's currently no way to manually load custom config files (as far as I can tell, at least - I couldn't find anything in the documentation) [...]
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Not manually load but per-system override configuration is possible.
Just create a file named vb.cfg with your settings. This allows to override mednafen.cfg and it will not be written by Mednafen.
See documentation.
| Quote: |
[...] I'm currently working around this issue by backing up the config to a backup folder ("cfgbak") before running Mednafen, and then restoring the config file after I'm done playing [...]
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I don't use Windows but... isn't it easier to set mednafen.cfg file as read-only?
[Updated on: Tue, 11 April 2023 14:06]
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| Re: Any better way to stop Mednafen from updating mednafen.cfg when passing settings via command lin [message #6875 is a reply to message #6874 ] |
Wed, 12 April 2023 06:31 |
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| AmatCoder wrote on Tue, 11 April 2023 14:03 |
| Quote: |
[...] Since there's currently no way to manually load custom config files (as far as I can tell, at least - I couldn't find anything in the documentation) [...]
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Not manually load but per-system override configuration is possible.
Just create a file named vb.cfg with your settings. This allows to override mednafen.cfg and it will not be written by Mednafen.
See documentation.
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I did see this, but unfortunately it doesn't fit my needs. I only need these custom settings for VR play, I have a different set of settings for normal use. And it turns out, using "vb.cfg" causes it to override any settings that I try to pass as command line arguments.
| AmatCoder wrote on Tue, 11 April 2023 14:03 |
| Quote: |
[...] I'm currently working around this issue by backing up the config to a backup folder ("cfgbak") before running Mednafen, and then restoring the config file after I'm done playing [...]
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I don't use Windows but... isn't it easier to set mednafen.cfg file as read-only?
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You'd think so, but no! This was the first thing I tried, and for whatever reason, Mednafen throws this error:
Failed to load settings from "mednafen.cfg": Error opening file "mednafen.cfg": Permission denied [Updated on: Wed, 12 April 2023 20:10]
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| Re: Any better way to stop Mednafen from updating mednafen.cfg when passing settings via command lin [message #6876 is a reply to message #6873 ] |
Wed, 12 April 2023 09:14 |
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the suggestion of Amatcoder by using a per-console config is your solution.
The per-console config do not touch your mednafen config.
mednafen gives priority to per-game config, per-console config and at the and to main mednafen config.
You need to create a vb.cfg and put this into it:
vb.3dmode sidebyside
vb.sidebyside.separation 43
vb.stretch 0
vb.xscalefs 3
vb.yscalefs 6
video.fs 1
All parameters not listed on custom config will be read from main mednafen.cfg.
[Updated on: Wed, 12 April 2023 09:16]
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| Re: Any better way to stop Mednafen from updating mednafen.cfg when passing settings via command lin [message #6878 is a reply to message #6877 ] |
Wed, 12 April 2023 20:09 |
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| AmatCoder wrote on Wed, 12 April 2023 10:02 |
True  . This was changed on 1.27.x version. From changelog:
-- 1.27.0-UNSTABLE: --
[...]
Open the main settings file for both reading+writing on startup instead of just reading,
to allow file locking to work over NFS, and as a quick check to make sure the file
is writeable before it's too late upon exit.
So you are doomed to use a batch file or two instances of Mednafen in separate folders.
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Hah, good spotting, so read-only would've worked a few versions ago. Oh well, relying on a batch file isn't the end of the world, what I've set up is working for me. I was mostly curious to see if there was something I was overlooking!
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