7 files changed, 199 insertions, 60 deletions
diff --git a/src/core/Makefile.am b/src/core/Makefile.am
index 1f1cc2e..b062f9e 100644
--- a/src/core/Makefile.am
+++ b/src/core/Makefile.am
@@ -1,12 +1,12 @@
 METASOURCES = AUTO
 INCLUDES = -I$(top_srcdir)/src
 
-libcore_la_SOURCES = core.cc game.cc
+libcore_la_SOURCES = applicationinterface.cc gameinterface.cc
 libcore_la_LDFLAGS = -avoid-version
 libcore_la_LIBADD = $(top_builddir)/src/math/libmath.la \
 	$(top_builddir)/src/common/libcommon.la \
 	$(top_builddir)/src/filesystem/libfilesystem.la
 
 noinst_LTLIBRARIES = libcore.la
-noinst_HEADERS = core.h game.h
+noinst_HEADERS = applicationinterface.h core.h gameinterface.h
 
diff --git a/src/core/applicationinterface.cc b/src/core/applicationinterface.cc
new file mode 100644
index 0000000..9ef5c16
--- /dev/null
+++ b/src/core/applicationinterface.cc
@@ -0,0 +1,68 @@
+/*
+   core/applicationinterface.cc
+   This file is part of the Osirion project and is distributed under
+   the terms of the GNU General Public License version 2
+*/
+
+#include "core/core.h"
+#include "filesystem/filesystem.h"
+#include "common/common.h"
+
+#include <iostream>
+
+#include <stdlib.h>
+
+namespace core {
+
+ApplicationInterface *ApplicationInterface::applicationinterface_instance = 0;
+
+ApplicationInterface::ApplicationInterface() {
+	if (applicationinterface_instance) {
+		std::cerr << "multiple singleton instances: core::ApplicationInterface" << std::endl;
+		exit(2);
+	}
+	applicationinterface_instance = this;
+}
+
+ApplicationInterface::~ApplicationInterface()
+{
+	applicationinterface_instance = 0;
+}
+
+ApplicationInterface *ApplicationInterface::instance() 
+{
+	return applicationinterface_instance;
+}
+
+void ApplicationInterface::init() 
+{
+        filesystem::init();
+
+	con_debug << "Initializing core..." << std::endl;
+
+        if (game())
+                game()->init();
+        else
+                con_warn << "No game module found!" << std::endl;
+
+}
+
+void ApplicationInterface::shutdown()
+{
+	con_debug << "Shutting down core..." << std::endl;
+
+	if (game())
+		game()->shutdown();
+	else
+		con_warn << "No game module found!" << std::endl;
+
+	filesystem::shutdown();
+}
+
+void ApplicationInterface::frame(float seconds)
+{
+	if (game())
+		game()->frame(seconds);
+}
+
+}
diff --git a/src/core/applicationinterface.h b/src/core/applicationinterface.h
new file mode 100644
index 0000000..19eaee6
--- /dev/null
+++ b/src/core/applicationinterface.h
@@ -0,0 +1,42 @@
+/*
+   core/applicationinterface.h
+   This file is part of the Osirion project and is distributed under
+   the terms of the GNU General Public License version 2.
+*/
+
+#ifndef __INCLUDED_CORE_APPLICATIONINTERFACE_H__
+#define __INCLUDED_CORE_APPLICATIONINTERFACE_H__
+
+namespace core {
+
+/// core interface for the client and server Application classes
+class ApplicationInterface {
+public:
+	/// default constructor
+	ApplicationInterface();
+
+	/// default destructor
+	virtual ~ApplicationInterface();
+
+	/// initialize the application
+	virtual void init();
+
+	/// shutdown the application
+	virtual void shutdown();
+
+	/// run a core frame
+	virtual void frame(float seconds);
+
+	/// a pointer to the current console instance
+	static ApplicationInterface *instance();
+
+private:
+	/// console singleton
+	static ApplicationInterface *applicationinterface_instance;
+};
+
+
+} // namespace core
+
+#endif // __INCLUDED_CORE_APPLICATIONINTERFACE_H__
+
diff --git a/src/core/core.cc b/src/core/core.cc
deleted file mode 100644
index 0a4ed60..0000000
--- a/src/core/core.cc
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
-   core/core.cc
-   This file is part of the Osirion project and is distributed under 
-   the terms of the GNU General Public License version 2 
-*/
-
-// project headers
-#include "common/common.h"
-#include "filesystem/filesystem.h"
-#include "core/core.h"
-
-namespace core
-{
-
-void init() 
-{
-	con_debug << "Initializing core..." << std::endl;
-
-	common::init();
-
-	filesystem::init();
-
-	if (::core::Game::instance())	
-		::core::Game::instance()->init();
-	else
-		con_warn << "No game module found!" << std::endl;
-	
-}
-
-void shutdown() 
-{
-	con_debug << "Shutting down core..." << std::endl;
-
-	if (::core::Game::instance())	
-		::core::Game::instance()->shutdown();
-	else
-		con_warn << "No game module found!" << std::endl;
-
-	filesystem::shutdown();
-
-	common::shutdown();
-}
-
-void frame(float sec) 
-{
-	if (::core::Game::instance())	
-		::core::Game::instance()->frame(sec);
-}
-
-} //namespace core
diff --git a/src/core/core.h b/src/core/core.h
index 09c7209..745fd86 100644
--- a/src/core/core.h
+++ b/src/core/core.h
@@ -7,20 +7,18 @@
 #ifndef __INCLUDED_CORE_H__
 #define __INCLUDED_CORE_H__
 
+#include "core/gameinterface.h"
+#include "core/applicationinterface.h"
+
 /// core contains the basic functionality of the engine
 namespace core
 {
-	/// initialize the core
-	void init();
-
-	/// shutdown the core
-	void shutdown();
+	inline GameInterface *game() { return GameInterface::instance(); }
 
-	/// run one frame
-	void frame(float sec);
+	inline ApplicationInterface *application() { return ApplicationInterface::instance(); }
+	
 };
 
-#include "core/game.h"
 
 #endif // __INCLUDED_CORE_H__
 
diff --git a/src/core/gameinterface.cc b/src/core/gameinterface.cc
new file mode 100644
index 0000000..964da2d
--- /dev/null
+++ b/src/core/gameinterface.cc
@@ -0,0 +1,37 @@
+/*
+   core/game.cc
+   This file is part of the Osirion project and is distributed under 
+   the terms of the GNU General Public License version 2 
+*/
+
+#include "core/gameinterface.h"
+
+#include <iostream>
+
+#include <stdlib.h>
+
+namespace core {
+
+GameInterface *GameInterface::gameinterface_instance = 0;
+
+GameInterface::GameInterface()
+{
+	if (gameinterface_instance) {
+		std::cerr << "multiple singleton instances: core::GameInterface" << std::endl;
+		exit(2);
+	}
+	gameinterface_instance = this;
+}
+
+GameInterface::~GameInterface()
+{
+	gameinterface_instance = 0;
+}
+
+GameInterface *GameInterface::instance()
+{
+	return gameinterface_instance;
+}
+
+}
+
diff --git a/src/core/gameinterface.h b/src/core/gameinterface.h
new file mode 100644
index 0000000..3bd887c
--- /dev/null
+++ b/src/core/gameinterface.h
@@ -0,0 +1,44 @@
+/*
+   core/game.h
+   This file is part of the Osirion project and is distributed under 
+   the terms of the GNU General Public License version 2 
+*/
+
+#ifndef __INCLUDED_CORE_GAMEINTERFACE_H__
+#define __INCLUDED_CORE_GAMEINTERFACE_H__
+
+namespace core
+{
+
+/// abstract interface from the core to the game-specific code
+/** The real game class has to derive from this class
+ */
+class GameInterface {
+public:
+	/// create a new game singleton
+	GameInterface();
+	/// destroy the game singleton
+	virtual ~GameInterface();
+
+	/// initialize the game
+	virtual void init() = 0;
+
+	/// shutdown the game
+	virtual void shutdown() = 0;
+
+	/// run one frame of the game
+	/** @param sec time since the previous frame, in seconds
+	 */
+	virtual void frame (float sec) = 0;
+
+	/// a pointer to the current game instance
+	static GameInterface * instance();
+
+private:
+	/// game singleton
+	static GameInterface *gameinterface_instance;
+};
+
+}
+
+#endif // __INCLUDED_CORE_GAMEINTERFACE_H__