[gnome-games] retro: Set the Libretro core system directory

[Adrien Plazas <aplazas src gnome org>]

commit 8e6ea0cd72834bb2fffec5275cb50cd310d5e718
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Fri Feb 10 12:04:35 2017 +0100

    retro: Set the Libretro core system directory
    
    Set the Libretro core system directory to a platform specific directory
    in the config directory.
    
    This allows the Libretro cores to look for firmwares in a well defined
    place.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=778447

 src/retro/retro-runner.vala |    4 ++++
 src/ui/application.vala     |    6 ++++++
 2 files changed, 10 insertions(+), 0 deletions(-)
---
diff --git a/src/retro/retro-runner.vala b/src/retro/retro-runner.vala
index c36a7d0..eea4898 100644
--- a/src/retro/retro-runner.vala
+++ b/src/retro/retro-runner.vala
@@ -203,6 +203,10 @@ public class Games.RetroRunner : Object, Runner {
                core = new Retro.Core (module_path);
                audio = new RetroGtk.PaPlayer ();
 
+               var platforms_dir = Application.get_platforms_dir ();
+               var platform = core_source.get_platform ();
+               core.system_directory = @"$platforms_dir/$platform/system";
+
                video.set_core (core);
                audio.set_core (core);
                core.input_interface = input_manager;
diff --git a/src/ui/application.vala b/src/ui/application.vala
index 4eac304..5d56a95 100644
--- a/src/ui/application.vala
+++ b/src/ui/application.vala
@@ -77,6 +77,12 @@ public class Games.Application : Gtk.Application {
                return @"$config_dir/gnome-games";
        }
 
+       public static string get_platforms_dir () {
+               var config_dir = get_config_dir ();
+
+               return @"$config_dir/platforms";
+       }
+
        public static string get_covers_dir () {
                var cache_dir = get_cache_dir ();