Add support for emulated Game Genie add-on

src/driver.h

@@ -2,6 +2,7 @@
 #define _FCEU_DRIVER_H
 
 #include <stdio.h>
+#include <libretro.h>
 
 #ifdef  __cplusplus
 extern "C" {
@@ -37,7 +38,9 @@ void FCEUD_SetPalette(uint8 index, uint8 r, uint8 g, uint8 b);
 /* Displays an error.  Can block or not. */
 void FCEUD_PrintError(char *s);
 void FCEUD_Message(char *s);
-void FCEUD_DispMessage(char *m);
+
+void FCEUD_DispMessage(enum retro_log_level level, unsigned duration, char *str);
+void FCEU_DispMessage(enum retro_log_level level, unsigned duration, char *format, ...);
 
 int FCEUI_BeginWaveRecord(char *fn);
 int FCEUI_EndWaveRecord(void);
@@ -99,7 +102,14 @@ void FCEUI_DisableSpriteLimitation(int a);
 /* -1 = no change, 0 = show, 1 = hide, 2 = internal toggle */
 void FCEUI_SetRenderDisable(int sprites, int bg);
 
-FCEUGI *FCEUI_LoadGame(const char *name, const uint8_t *buf, size_t bufsize);
+/* frontend_post_load_init_cb() is called immediately
+ * after loading the ROM, allowing any frontend
+ * initialisation that is dependent on ROM type to
+ * be performed before the regular internal post-load
+ * initialisation */
+typedef void (*frontend_post_load_init_cb_t)(void);
+FCEUGI *FCEUI_LoadGame(const char *name, const uint8_t *databuf, size_t databufsize,
+      frontend_post_load_init_cb_t frontend_post_load_init_cb);
 
 #ifdef COPYFAMI
 /* Fake UNIF board to start new CFHI instance */
@@ -168,8 +178,6 @@ void FCEUI_LoadMovie(char *fname);
 
 int32 FCEUI_GetDesiredFPS(void);
 void FCEUI_SaveSnapshot(void);
-void FCEU_DispMessage(char *format, ...);
-#define FCEUI_DispMessage FCEU_DispMessage
 
 int FCEUI_DecodePAR(const char *code, uint16 *a, uint8 *v, int *c, int *type);
 int FCEUI_DecodeGG(const char *str, uint16 *a, uint8 *v, int *c);