DC: Allow plugins to be grouped into subdirectories

By letting the user select which group of plugins to load, an out of
memory condition can be avoided while still allowing all plugins to be
stored on the same disc.

backends/platform/dc/dc.h

@@ -250,6 +250,11 @@ public:
  protected:
   Plugin* createPlugin(const Common::FSNode &node) const;
   bool isPluginFilename(const Common::FSNode &node) const;
+  void addCustomDirectories(Common::FSList &dirs) const;
+ public:
+  PluginList getPlugins();
+ private:
+  const char *pluginCustomDirectory;
 #endif
 };
 
@@ -258,3 +263,6 @@ extern int handleInput(struct mapledev *pad,
 		       int &mouse_x, int &mouse_y,
 		       byte &shiftFlags, Interactive *inter = NULL);
 extern bool selectGame(char *&, char *&, Common::Language &, Common::Platform &, class Icon &);
+#ifdef DYNAMIC_MODULES
+extern bool selectPluginDir(Common::String &selection, const Common::FSNode &base);
+#endif

backends/platform/dc/plugins.cpp

@@ -130,4 +130,27 @@ bool OSystem_Dreamcast::isPluginFilename(const Common::FSNode &node) const {
 	return true;
 }
 
+void OSystem_Dreamcast::addCustomDirectories(Common::FSList &dirs) const
+{
+  FilePluginProvider::addCustomDirectories(dirs);
+  if (pluginCustomDirectory != NULL)
+    dirs.push_back(Common::FSNode(pluginCustomDirectory));
+}
+
+PluginList OSystem_Dreamcast::getPlugins()
+{
+  pluginCustomDirectory = NULL;
+  PluginList list = FilePluginProvider::getPlugins();
+  if (list.empty()) {
+    Common::String selection;
+    if (selectPluginDir(selection, Common::FSNode("plugins"))) {
+      pluginCustomDirectory = selection.c_str();
+      list = FilePluginProvider::getPlugins();
+      pluginCustomDirectory = NULL;
+    }
+  }
+  return list;
+}
+
+
 #endif // defined(DYNAMIC_MODULES)

backends/platform/dc/selector.cpp

@@ -39,6 +39,7 @@
 
 #define MAX_GAMES 100
 #define MAX_DIR 100
+#define MAX_PLUGIN_DIRS 100
 
 
 void draw_solid_quad(float x1, float y1, float x2, float y2,
@@ -517,3 +518,55 @@ bool selectGame(char *&ret, char *&dir_ret, Common::Language &lang_ret, Common::
   } else
     return false;
 }
+
+#ifdef DYNAMIC_MODULES
+static int findPluginDirs(Game *plugin_dirs, int max, const Common::FSNode &base)
+{
+  Common::FSList fslist;
+  int curr_dir = 0;
+  base.getChildren(fslist, Common::FSNode::kListDirectoriesOnly);
+  for (Common::FSList::const_iterator entry = fslist.begin(); entry != fslist.end();
+       ++entry) {
+    if (entry->isDirectory()) {
+      if (curr_dir >= max)
+	break;
+      strncpy(plugin_dirs[curr_dir].dir, (*entry).getPath().c_str(), 256);
+      strncpy(plugin_dirs[curr_dir].text, (*entry).getDisplayName().c_str(), 256);
+      plugin_dirs[curr_dir].icon.load(NULL, 0, 0);
+      curr_dir++;
+    }
+  }
+  return curr_dir;
+}
+
+bool selectPluginDir(Common::String &selection, const Common::FSNode &base)
+{
+  Game *plugin_dirs = new Game[MAX_PLUGIN_DIRS];
+  int selected, num_plugin_dirs;
+
+  ta_sync();
+  void *mark = ta_txmark();
+
+  num_plugin_dirs = findPluginDirs(plugin_dirs, MAX_PLUGIN_DIRS, base);
+
+  for (int i=0; i<num_plugin_dirs; i++) {
+    plugin_dirs[i].icon.create_texture();
+    plugin_dirs[i].label.create_texture(plugin_dirs[i].text);
+  }
+
+  selected = gameMenu(plugin_dirs, num_plugin_dirs);
+
+  ta_sync();
+  ta_txrelease(mark);
+
+  if (selected >= num_plugin_dirs)
+    selected = -1;
+
+  if (selected >= 0)
+    selection = plugin_dirs[selected].dir;
+
+  delete[] plugin_dirs;
+
+  return selected >= 0;
+}
+#endif