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diff --git a/src/emu/main.h b/src/emu/main.h
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+// license:BSD-3-Clause
+// copyright-holders:Nicola Salmoria, Aaron Giles
+/***************************************************************************
+
+ main.h
+
+ Controls execution of the core emulator system.
+***************************************************************************/
+
+#pragma once
+
+#ifndef __EMU_H__
+#error Dont include this file directly; include emu.h instead.
+#endif
+
+#ifndef __MAIN_H__
+#define __MAIN_H__
+
+#include <time.h>
+
+//**************************************************************************
+// CONSTANTS
+//**************************************************************************
+
+enum
+{
+ EMU_ERR_NONE = 0, /* no error */
+ EMU_ERR_FAILED_VALIDITY = 1, /* failed validity checks */
+ EMU_ERR_MISSING_FILES = 2, /* missing files */
+ EMU_ERR_FATALERROR = 3, /* some other fatal error */
+ EMU_ERR_DEVICE = 4, /* device initialization error (MESS-specific) */
+ EMU_ERR_NO_SUCH_GAME = 5, /* game was specified but doesn't exist */
+ EMU_ERR_INVALID_CONFIG = 6, /* some sort of error in configuration */
+ EMU_ERR_IDENT_NONROMS = 7, /* identified all non-ROM files */
+ EMU_ERR_IDENT_PARTIAL = 8, /* identified some files but not all */
+ EMU_ERR_IDENT_NONE = 9 /* identified no files */
+};
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+class osd_interface;
+
+class emulator_info
+{
+public:
+ // construction/destruction
+ emulator_info() {};
+
+ static const char * get_appname();
+ static const char * get_appname_lower();
+ static const char * get_configname();
+ static const char * get_copyright();
+ static const char * get_copyright_info();
+ static const char * get_bare_build_version();
+ static const char * get_build_version();
+ static void display_ui_chooser(running_machine& machine);
+ static int start_frontend(emu_options &options, osd_interface &osd, int argc, char *argv[]);
+ static void draw_user_interface(running_machine& machine);
+ static void periodic_check();
+ static bool frame_hook();
+};
+
+// ======================> machine_manager
+class ui_manager;
+
+class machine_manager
+{
+ DISABLE_COPYING(machine_manager);
+protected:
+ // construction/destruction
+ machine_manager(emu_options &options, osd_interface &osd) : m_osd(osd), m_options(options), m_machine(nullptr) { }
+public:
+ virtual ~machine_manager() { }
+
+ osd_interface &osd() const { return m_osd; }
+ emu_options &options() const { return m_options; }
+
+ running_machine *machine() { return m_machine; }
+
+ void set_machine(running_machine *machine) { m_machine = machine; }
+
+ virtual ui_manager* create_ui(running_machine& machine) { return nullptr; }
+ virtual void ui_initialize(running_machine& machine,bool firstrun) { }
+
+ virtual void update_machine() { }
+protected:
+ osd_interface & m_osd; // reference to OSD system
+ emu_options & m_options; // reference to options
+ running_machine * m_machine;
+};
+
+
+#endif /* __MAIN_H__ */