[gnome-games] Add libretro plugin

[Adrien Plazas <aplazas src gnome org>]

commit 7b2b6bc79e5a5dafe4ec6f6b39fb19a72005d2de
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Sun Feb 19 17:52:05 2017 +0100

    Add libretro plugin
    
    Add the libretro plugin, allowing to run standalone Libretro games
    shipping a Libretro core descriptor.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=777371

 configure.ac                                   |    1 +
 plugins/Makefile.am                            |    4 ++
 plugins/libretro/Makefile.am                   |    3 +
 plugins/libretro/configure.ac                  |   15 ++++++
 plugins/libretro/data/Makefile.am              |    6 +++
 plugins/libretro/data/libretro.plugin          |    6 +++
 plugins/libretro/src/Makefile.am               |   58 ++++++++++++++++++++++++
 plugins/libretro/src/libretro-game-source.vala |   41 +++++++++++++++++
 plugins/libretro/src/libretro-icon.vala        |   23 +++++++++
 plugins/libretro/src/libretro-plugin.vala      |   12 +++++
 plugins/libretro/src/libretro-title.vala       |   13 +++++
 plugins/libretro/src/libretro-uid.vala         |   15 ++++++
 12 files changed, 197 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index e84a540..d66d6ab 100644
--- a/configure.ac
+++ b/configure.ac
@@ -32,6 +32,7 @@ m4_include([plugins/nes/configure.ac])
 m4_include([plugins/game-boy/configure.ac])
 m4_include([plugins/game-boy-advance/configure.ac])
 m4_include([plugins/game-cube/configure.ac])
+m4_include([plugins/libretro/configure.ac])
 m4_include([plugins/love/configure.ac])
 m4_include([plugins/mame/configure.ac])
 m4_include([plugins/master-system/configure.ac])
diff --git a/plugins/Makefile.am b/plugins/Makefile.am
index e52cdc6..cd409c4 100644
--- a/plugins/Makefile.am
+++ b/plugins/Makefile.am
@@ -36,6 +36,10 @@ if ENABLE_GAME_CUBE_PLUGIN
 SUBDIRS += game-cube
 endif
 
+if ENABLE_LIBRETRO_PLUGIN
+SUBDIRS += libretro
+endif
+
 if ENABLE_LOVE_PLUGIN
 SUBDIRS += love
 endif
diff --git a/plugins/libretro/Makefile.am b/plugins/libretro/Makefile.am
new file mode 100644
index 0000000..5d55ad0
--- /dev/null
+++ b/plugins/libretro/Makefile.am
@@ -0,0 +1,3 @@
+SUBDIRS = data src
+
+-include $(top_srcdir)/git.mk
diff --git a/plugins/libretro/configure.ac b/plugins/libretro/configure.ac
new file mode 100644
index 0000000..5a490e8
--- /dev/null
+++ b/plugins/libretro/configure.ac
@@ -0,0 +1,15 @@
+PKG_CHECK_MODULES(LIBRETRO_PLUGIN, [
+       gio-2.0
+       glib-2.0 >= $GLIB_MIN_VERSION
+       gtk+-3.0
+       retro-gtk-0.10
+       tracker-sparql-1.0
+], [enable_libretro_plugin=yes], [enable_libretro_plugin=no])
+
+AM_CONDITIONAL(ENABLE_LIBRETRO_PLUGIN, test x$enable_libretro_plugin != xno)
+
+AC_CONFIG_FILES([
+       plugins/libretro/Makefile
+       plugins/libretro/data/Makefile
+       plugins/libretro/src/Makefile
+])
diff --git a/plugins/libretro/data/Makefile.am b/plugins/libretro/data/Makefile.am
new file mode 100644
index 0000000..4c8d3a3
--- /dev/null
+++ b/plugins/libretro/data/Makefile.am
@@ -0,0 +1,6 @@
+EXTRA_DIST = $(plugin_DATA)
+
+plugindir = $(libdir)/gnome-games/plugins
+dist_plugin_DATA = libretro.plugin
+
+-include $(top_srcdir)/git.mk
diff --git a/plugins/libretro/data/libretro.plugin b/plugins/libretro/data/libretro.plugin
new file mode 100644
index 0000000..9cab0ab
--- /dev/null
+++ b/plugins/libretro/data/libretro.plugin
@@ -0,0 +1,6 @@
+[Plugin]
+Module=libgames-libretro-plugin
+Name=Libretro Plugin
+Description=Provides support for standalone Libretro games.
+Authors=Adrien Plazas <kekun plazas laposte net>
+Copyright=Copyright © 2017 Adrien Plazas
diff --git a/plugins/libretro/src/Makefile.am b/plugins/libretro/src/Makefile.am
new file mode 100644
index 0000000..39026a0
--- /dev/null
+++ b/plugins/libretro/src/Makefile.am
@@ -0,0 +1,58 @@
+plugindir = $(libdir)/gnome-games/plugins
+plugin_LTLIBRARIES = libgames-libretro-plugin.la
+
+libgames_libretro_plugin_la_DEPENDENCIES = \
+       $(top_builddir)/src/gnome-games.vapi \
+       $(NULL)
+
+libgames_libretro_plugin_la_SOURCES = \
+       libretro-game-source.vala \
+       libretro-icon.vala \
+       libretro-plugin.vala \
+       libretro-title.vala \
+       libretro-uid.vala \
+       $(NULL)
+
+libgames_libretro_plugin_la_VALAFLAGS = \
+       --target-glib=@GLIB_MIN_VERSION@ \
+       --pkg gnome-games \
+       --pkg gio-2.0 \
+       --pkg glib-2.0 \
+       --pkg gtk+-3.0 \
+       --pkg retro-gtk-0.10 \
+       --pkg tracker-sparql-1.0 \
+       --vapidir $(top_builddir)/src \
+       $(NULL)
+
+libgames_libretro_plugin_la_CFLAGS = \
+       $(LIBRETRO_PLUGIN_CFLAGS) \
+       $(GNOME_GAMES_CFLAGS) \
+       -DG_LOG_DOMAIN=\"GamesLibretro\" \
+       -DLOCALEDIR=\"$(localedir)\" \
+       $(NULL)
+
+libgames_libretro_plugin_la_CPPFLAGS = \
+       -I$(top_srcdir) \
+       -I$(top_srcdir)/src \
+       $(NULL)
+
+libgames_libretro_plugin_la_LIBADD = \
+       $(LIBRETRO_PLUGIN_LIBS) \
+       $(GNOME_GAMES_LIBS) \
+       $(NULL)
+
+libgames_libretro_plugin_la_LDFLAGS = \
+       -no-undefined \
+       -module \
+       -avoid-version \
+       $(NULL)
+
+EXTRA_DIST = \
+       $(plugin_DATA) \
+       $(NULL)
+
+MAINTAINERCLEANFILES = \
+       $(BUILT_SOURCES) \
+       $(NULL)
+
+-include $(top_srcdir)/git.mk
diff --git a/plugins/libretro/src/libretro-game-source.vala b/plugins/libretro/src/libretro-game-source.vala
new file mode 100644
index 0000000..774cb3e
--- /dev/null
+++ b/plugins/libretro/src/libretro-game-source.vala
@@ -0,0 +1,41 @@
+// This file is part of GNOME Games. License: GPLv3
+
+public class Games.LibretroGameSource : Object, GameSource {
+       private Retro.CoreDescriptor[] descriptors;
+
+       public async void each_game (GameCallback callback) {
+               if (descriptors == null) {
+                       descriptors = {};
+                       // TODO Should yield for each core descriptor.
+                       Retro.ModuleQuery.foreach_core_descriptor (parse_core_descriptor);
+               }
+
+               foreach (var core_descriptor in descriptors) {
+                       var game = game_for_core_descriptor (core_descriptor);
+                       callback (game);
+                       yield;
+               }
+       }
+
+       private bool parse_core_descriptor (Retro.CoreDescriptor core_descriptor) {
+               try {
+                       if (core_descriptor.get_is_game ())
+                               descriptors += core_descriptor;
+               }
+               catch (Error e) {
+                       debug (e.message);
+               }
+
+               return false;
+       }
+
+       private static Game game_for_core_descriptor (Retro.CoreDescriptor core_descriptor) throws Error {
+               var uid = new LibretroUid (core_descriptor);
+               var title = new LibretroTitle (core_descriptor);
+               var icon = new LibretroIcon (core_descriptor);
+               var cover = new DummyCover ();
+               var runner = new RetroRunner.for_core_descriptor (core_descriptor, uid);
+
+               return new GenericGame (title, icon, cover, runner);
+       }
+}
diff --git a/plugins/libretro/src/libretro-icon.vala b/plugins/libretro/src/libretro-icon.vala
new file mode 100644
index 0000000..6ed65c6
--- /dev/null
+++ b/plugins/libretro/src/libretro-icon.vala
@@ -0,0 +1,23 @@
+// This file is part of GNOME Games. License: GPLv3
+
+public class Games.LibretroIcon : Object, Icon {
+       private Retro.CoreDescriptor core_descriptor;
+
+       public LibretroIcon (Retro.CoreDescriptor core_descriptor) {
+               this.core_descriptor = core_descriptor;
+       }
+
+       public GLib.Icon? get_icon () {
+               if (!core_descriptor.has_icon ())
+                       return null;
+
+               try {
+                       return core_descriptor.get_icon ();
+               }
+               catch (Error e) {
+                       debug (e.message);
+
+                       return null;
+               }
+       }
+}
diff --git a/plugins/libretro/src/libretro-plugin.vala b/plugins/libretro/src/libretro-plugin.vala
new file mode 100644
index 0000000..55c30f6
--- /dev/null
+++ b/plugins/libretro/src/libretro-plugin.vala
@@ -0,0 +1,12 @@
+// This file is part of GNOME Games. License: GPLv3
+
+private class Games.LibretroPlugin : Object, Plugin {
+       public GameSource get_game_source () throws Error {
+               return new LibretroGameSource ();
+       }
+}
+
+[ModuleInit]
+public Type register_games_plugin (TypeModule module) {
+       return typeof(Games.LibretroPlugin);
+}
diff --git a/plugins/libretro/src/libretro-title.vala b/plugins/libretro/src/libretro-title.vala
new file mode 100644
index 0000000..7763c05
--- /dev/null
+++ b/plugins/libretro/src/libretro-title.vala
@@ -0,0 +1,13 @@
+// This file is part of GNOME Games. License: GPLv3
+
+public class Games.LibretroTitle : Object, Title {
+       private Retro.CoreDescriptor core_descriptor;
+
+       public LibretroTitle (Retro.CoreDescriptor core_descriptor) {
+               this.core_descriptor = core_descriptor;
+       }
+
+       public string get_title () throws Error {
+               return core_descriptor.get_name ();
+       }
+}
diff --git a/plugins/libretro/src/libretro-uid.vala b/plugins/libretro/src/libretro-uid.vala
new file mode 100644
index 0000000..e125864
--- /dev/null
+++ b/plugins/libretro/src/libretro-uid.vala
@@ -0,0 +1,15 @@
+// This file is part of GNOME Games. License: GPLv3
+
+public class Games.LibretroUid : Object, Uid {
+       private Retro.CoreDescriptor core_descriptor;
+
+       public LibretroUid (Retro.CoreDescriptor core_descriptor) {
+               this.core_descriptor = core_descriptor;
+       }
+
+       public string get_uid () throws Error {
+               var id = core_descriptor.get_id ();
+
+               return @"libretro-$id";
+       }
+}