Attached Chars can't load fonts

[Raki3l]

Describe the bug

Even though Attached Chars are essentially chars, they can't load fonts, Ikemen crashes if you try to do that.

To Reproduce

1. Put an Attached Char in your stage.
2. Declare a valid font in the AC's .def.
3. Try to load the stage
4. To get the error log, load it via the command line ikemen-error-log.txt

Expected behavior

Load the fonts like the chars do.

Screenshots / Video

No response

Engine Version (or source code date)

nightly 2024-09-23

Operating system

Windows

Extra context or search terms

No response

[potsmugen]

My observations so far in case it saves the next person some time:

• Chars preload their fonts when Ikemen starts (why by the way?)
• Attached chars load their fonts only when the stage is selected and loads the attached char
• The method called for both cases is the same
• The former works, the latter results in that crash

[Raki3l]

I’ll add a few more observations I made as well:

• ACs can load fonts, but only .fnt files. The issue doesn’t seem to be specifically related to the ACs; it appears to be more about the method of loading the fonts, particularly how TrueType and bitmap fonts cause issues with GLFont.
• If the same method is used to load fonts for regular chars (without preloading), it crashes with the exact same issue related to GLFont when using TrueType fonts. Bitmap fonts, on the other hand, cause a strange issue where the char loading the font and the stage aren’t rendered correctly, so this is probably why regular chars preload their fonts.