Add DB:create_entry support

[ZNixian]

Tested, and works fine, on Void UI. It doesn't seem to work with loading the mod icons in the mod manager, however that is most likely a timing issue that will be rarely encountered (though should still be fixed).

[hellow554]

Amazing work, I love it :) Have to test it though...

[ZNixian]

No problem - thanks for reviewing it.

[hellow554]

Hmm, looks good so far, as it does not crash :) One Problem I occur is

10:08:36 AM Lua: [Error] Mod image at path does not exist! mods/base/blt.png

although it does exist..

ls -l .steam/steam/steamapps/common/PAYDAY\ 2/mods/base/blt.png 
-rw-r--r-- 1 marcel marcel 22831  3. Jan 09:37 '.steam/steam/steamapps/common/PAYDAY 2/mods/base/blt.png'

I guess there is something wrong with (my)) working directory?

[ZNixian]

No, that's casued by Application:nice_path, which is looking for mods/base/blt.png/ - the code calling this is in BLTMod.lua:284 in the base mod.

[hellow554]

When I change that line (which is 279 ) to if SystemFS:exists( self:GetModImagePath() ) then (I don't know LUA very well, so please forgive my stupidity) payday crashes with this:

Pure virtual function called!

I don't know if I should attach a debugger, but I don't know which side to blame (blt4l or payday)

[ZNixian]

First, check crash.txt (in mods/logs) and see if that was crashing it, or one of the functions inside the if. Attaching a debugger and grabbing the stacktrace (one of the things I never got around to putting in crash.txt) would be useful, too.

I cannot replicate it, however.

[hellow554]

The problem is the old one :| Lua runtime error: mods/base/req/BLTMod.lua:286: attempt to call method 'create_entry' (a nil value), sad...

279c279
<   if SystemFS:exists( Application:nice_path( self:GetModImagePath(), true ) ) then
---
>   if SystemFS:exists( self:GetModImagePath() ) then

Here's the steps I took:

1. git clone https://github.com/ZNixian/blt4l.git
2. cd blt4l
3. git submodule init; git submodule update
4. mkdir build; cd build; cmake ..; make
5. cp libblt_loader.so ~/.steam/steam/steamapps/common/PAYDAY\ 2/
6. cp -r mods/ ~/.steam/steam/steamapps/common/PAYDAY\ 2/
7. patch ~/.steam/steam/steamapps/common/PAYDAY\ 2/mods/base/req/BLTMod.lua patchfromabove.diff
8. Steam Launch options: LD_PRELOAD="$LD_PRELOAD /home/marcel/.steam/steam/steamapps/common/PAYDAY2/libblt_loader.so" %command% -skip_intro
9. Start Steam and click go into options -> blt options

One thing is, that there is a symlink from PAYDAY2 to PAYDAY\ 2, because I couldn't figure out how to put a space into the steam launch options (\ didn't work, neither ' '). Am I just to stupid this morning? I hope not :|

[ZNixian]

cmake ..

Ah, that's your problem. For interopability with PD2 beyond basic Lua stuff, we have to use the same standard library. PD2 uses libc++/libcxx, while you're probably compiling with glibc.

You have to install LibCXX, LLVM/Clang, and pass -DUSE_LIBCXX=1 to cmake.

[hellow554]

Progress! Now it does not show the text "No Image" anymore and it does not crash, but... see yourself

So I guess it works, but not showing up the picture is another problem?

Btw, I would recommend then updating the README.md

[ZNixian]

Yeah, this is where I ended up. I suspect it's due to reload_textures not working with my asset implementation.

[hellow554]

Alright. I would suggest updating the Readme and then I don't see anything that would block this PR

[RomanHargrave]

@ZNixian to verify, we are waiting for a reload_textures hack in order to actually use loaded textures? I've been testing this PR and that would line up. BeardLib is able to load assets but they aren't useable.

[ZNixian]

Yes, that's the case. For whatever (@Fanged-Hex) reason, VoidUI is able to load and use textures without reload_textures, however BLT doesn't seem to.

I suspect this has something to do with timing, and when the texture caching stuff is loaded.