How does romfs work?


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Eclipse2212

Posted on 08-10-16 08:47 PM

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Hello,

I'm working on an homebrew that require to load a crapload of files, essentially sprites and sound.

I've searched a lot over the Internet, but, I don't understand how to link the files to the code
(I'm using sf2d with sftd and sfil, if it can help.)

I tried several times but the only thing that render is a black screen and my console who hangs (I use a 2Ds xD)

I worked when I was using the data folder, so, I really don't understand why it doesn't work.

I will accept any kind of help, beceause this make me crazy.

Oh, if you want the source code, i can link a compressed file.

Have a nice trap!

Eclipse2212.

profi200

Posted on 08-10-16 08:51 PM

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Example how to use the RomFS here: https://github.com/devkitPro/3ds-examples/tree/master/romfs

Eclipse2212

Posted on 08-10-16 08:58 PM

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Thanks, already found this example,
Actually, I'm using this to try to make my code work.

It leads me to a "silly" question: when i load the files with sfil, do I have to open the file by myself, or the lib do it by itself?

profi200

Posted on 08-10-16 09:29 PM

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I'm not familiar with that lib. If it is not hardcoded to sdmc:/ and uses fopen and friends you can just pass romfs:/ paths.

Eclipse2212

Posted on 08-10-16 09:46 PM (rev. 4 of 08-10-16 10:14 PM)

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Okay, gonna search in the lib project

EDIT:

Hmmm...

Found on png.c in the sfil project:

sf2d_texture *sfil_load_PNG_file(const char *filename, sf2d_place place)
{
	png_byte pngsig[PNG_SIGSIZE];
	FILE *fp;

	if ((fp = fopen(filename, "rb")) == NULL) {
		goto exit_error;
	}

	if (fread(pngsig, 1, PNG_SIGSIZE, fp) != PNG_SIGSIZE) {
		goto exit_close;
	}

	if (png_sig_cmp(pngsig, 0, PNG_SIGSIZE) != 0) {
		goto exit_close;
	}

	sf2d_texture *texture = _sfil_load_PNG_generic((void *)fp, _sfil_read_png_file_fn, place);
	fclose(fp);
	return texture;

exit_close:
	fclose(fp);
exit_error:
	return NULL;
}

So, the Lib open the file as "read binary", so the erroro come from the path of the files?

I declared the load like this:

sf2d_texture *Act0 = sfil_load_PNG_file("romfs:/tex/spr_actbt_center_0.png", SF2D_PLACE_RAM);

Is this Ok?

(Sorry to bother you so much)

EDIT 2:

Oh, the files weren't at the good place

profi200

Posted on 08-10-16 10:17 PM

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So yes, the lib should deal fine with files from RomFS. Now you just must make sure the files are actually in the RomFS and at the right location.

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