Allow java implementation to load assets from filesystem

[ghost]

A simple patch to let java version to load assets from one or multiple directories using a new Assets implementation when "assetsDirectories" new setting is set.

[jamie-threerings]

This looks really useful, but I don't see a compelling reason to spin off a subclass for it. Also, how does this interplay with the pathPrefix property?

[deadmoose]

I'll also chime in to ask after assetScale().

It's been long enough that I don't remember the details, but I'd apparently worried about that once upon a time when wrote my own version of this: https://github.com/deadmoose/flumptools/blob/master/playn/src/main/java/com/deadmoose/flumptools/playn/FileAssets.java

@jamie-threerings: you might also nose around inside OOO; I know @mthomas96 had written similar for our editors. I don't remember if we ever reconciled differences between our two implementations.

[ghost]

@jamie-threerings:

I use a subclass to avoid bloating JavaAssets and provides a clean pull request. But they can be merged, if you think it is better.

pathPrefix is still used: it means that if you just set /my/nice/path/ in assetsDirectories, assets will be loaded from /my/nice/path/${pathPrefix}. Do you think pathPrefix should be ignored for file system assets?

[ghost]

@deadmoose

I cannot figure what could go wrong with assetScale. Maybe you ran into issues with previous playn versions?

Where is the mthomas96 implementation?

[deadmoose]

It's been the better part of a year, so I really can't recall the details...possibly I had to do that to very explicitly tell it to open the file that I asked for, not to try to get fancy? Looks like I should have been able to just setAssetScale() from my application instead of hardwiring it. Or, like you say, things might have been different back in 2013.

The @mthomas96 implementation is internal to Three Rings; he'd done it for the various tools (e.g. level editor) for the games we were working on. But since neither he nor I are at OOO any more, have to go through someone like @jamie-threerings to get insight on it.

Which reminds me of the other thing for Jamie to check: at some point, we added a way for either pinkey-game or pinkey-editor to load sounds from an arbitrary location. That may or may not have been built on top of our internal FileAssets... it'd be worth taking a quick peek.

[ghost]

@deadmoose Is there a playn code formatting configuration file for Netbeans/Eclipse/... somewhere?

[jamie-threerings]

I pushed a slightly different approach that implements this in JavaAssets. Please check it out and make comments or raise issues. I haven't tested it thoroughly yet.