fix undefined referances.

Makefile

@@ -31,6 +31,7 @@ OBJS += cheats.o
 OBJS += zip.o
 
 OBJS += libretro.o
+OBJS += libco/libco.o
 
 
 

common.h

@@ -110,6 +110,8 @@
 #define GBA_SCREEN_HEIGHT (160)
 #define GBA_SCREEN_PITCH  (240)
 
+void switch_to_main_thread(void);
+
 #else
   #include "SDL.h"
 #endif

input.c

@@ -345,7 +345,29 @@ void init_input()
 
 #elif defined(__LIBRETRO__)
 
-/* todo */
+static retro_input_state_t input_state_cb;
+void retro_set_input_state(retro_input_state_t cb) { input_state_cb = cb; }
+
+u32 update_input(void)
+{
+//   return;
+   unsigned i;
+   uint32_t new_key = 0;
+
+   if (!input_state_cb)
+      return 0;
+
+   for (i = 0; i < sizeof(btn_map) / sizeof(map); i++)
+      new_key |= input_state_cb(0, RETRO_DEVICE_JOYPAD, 0, btn_map[i].retropad) ? btn_map[i].gba : 0;
+
+   if ((new_key | key) != key)
+      trigger_key(new_key);
+
+   key = new_key;
+   io_registers[REG_P1] = (~key) & 0x3FF;
+
+   return 0;
+}
 
 #elif defined(PC_BUILD)
 

input.h

@@ -82,6 +82,28 @@ gui_action_type get_gui_input_fs_hold(u32 button_id);
 void input_write_mem_savestate(file_tag_type savestate_file);
 void input_read_savestate(file_tag_type savestate_file);
 
+#ifdef __LIBRETRO__
+#include "libretro.h"
+
+typedef struct
+{
+   unsigned retropad ;
+   input_buttons_type gba;
+} map;
+static const map btn_map[] = {
+   { RETRO_DEVICE_ID_JOYPAD_L,      BUTTON_L },
+   { RETRO_DEVICE_ID_JOYPAD_R,      BUTTON_R },
+   { RETRO_DEVICE_ID_JOYPAD_DOWN,   BUTTON_DOWN },
+   { RETRO_DEVICE_ID_JOYPAD_UP,     BUTTON_UP },
+   { RETRO_DEVICE_ID_JOYPAD_LEFT,   BUTTON_LEFT },
+   { RETRO_DEVICE_ID_JOYPAD_RIGHT,  BUTTON_RIGHT },
+   { RETRO_DEVICE_ID_JOYPAD_START,  BUTTON_START },
+   { RETRO_DEVICE_ID_JOYPAD_SELECT, BUTTON_SELECT },
+   { RETRO_DEVICE_ID_JOYPAD_B,      BUTTON_B },
+   { RETRO_DEVICE_ID_JOYPAD_A,      BUTTON_A }
+};
+#endif
+
 extern u32 gamepad_config_map[];
 extern u32 global_enable_analog;
 extern u32 analog_sensitivity_level;

libretro.c

@@ -21,6 +21,15 @@ struct retro_perf_callback perf_cb;
 static cothread_t main_thread;
 static cothread_t cpu_thread;
 
+/* to be removed */
+u32 savestate_slot = 0;
+void get_savestate_filename_noshot(u32 slot, char *name_buffer)
+{
+  (void) slot;
+  sprintf(name_buffer, "dummy.svs");
+}
+/* ------------ */
+
 void switch_to_main_thread(void)
 {
    co_switch(main_thread);

main.c

@@ -214,6 +214,7 @@ void init_main()
   flush_translation_cache_bios();
 }
 
+#ifndef __LIBRETRO__
 int main(int argc, char *argv[])
 {
   char bios_filename[512];
@@ -384,6 +385,7 @@ int main(int argc, char *argv[])
 #endif
   return 0;
 }
+#endif
 
 void print_memory_stats(u32 *counter, u32 *region_stats, char *stats_str)
 {
@@ -625,6 +627,12 @@ u32 update_gba()
           flush_ram_count = 0;
   #endif
 
+#ifdef __LIBRETRO__
+          switch_to_main_thread();
+
+          update_gbc_sound(cpu_ticks);
+          gbc_sound_update = 0;
+#else
           if(update_input())
             continue;
 
@@ -645,7 +653,7 @@ u32 update_gba()
 
           if(update_backup_flag)
             update_backup();
-
+#endif
           process_cheats();
 
           event_cycles++;

memory.c

@@ -2197,7 +2197,9 @@ u32 load_gamepak(const char *name)
     gamepak_maker[2] = 0;
 
     load_game_config(gamepak_title, gamepak_code, gamepak_maker);
+#ifndef __LIBRETRO__
     load_game_config_file();
+#endif
 
     change_ext(gamepak_filename, cheats_filename, ".cht");
     add_cheats(cheats_filename);

video.c

@@ -3387,6 +3387,7 @@ void flip_screen()
 
 #endif
 
+#ifndef __LIBRETRO__
 u32 frame_to_render;
 
 void update_screen()
@@ -3394,6 +3395,7 @@ void update_screen()
   if(!skip_next_frame)
     flip_screen();
 }
+#endif
 
 #ifdef PSP_BUILD
 

video.h

@@ -21,7 +21,9 @@
 #define VIDEO_H
 
 void update_scanline();
+#ifndef __LIBRETRO__
 void update_screen();
+#endif
 void init_video();
 void video_resolution_large();
 void video_resolution_small();