Port field_camera from Emerald

include/event_object_movement.h

@@ -129,6 +129,8 @@ void UpdateObjectEventSpriteVisibility(struct Sprite *sprite, bool8 invisible);
 u8 ZCoordToPriority(u8 z);
 void SetObjectSubpriorityByZCoord(u8 z, struct Sprite * sprite, u8 offset);
 void MakeObjectTemplateFromObjectEventGraphicsInfo(u16 graphicsId, void (*callback)(struct Sprite *), struct SpriteTemplate *spriteTemplate, const struct SubspriteTable **subspriteTables);
+u8 AddCameraObject(u8 trackedSpriteId);
+void UpdateObjectEventsForCameraUpdate(s16 x, s16 y);
 
 // Exported data declarations
 

include/field_camera.h

@@ -8,9 +8,9 @@
 struct CameraObject
 {
     void (*callback)(struct CameraObject *);
-    u32 unk4;
-    s32 unk8;
-    s32 unkC;
+    u32 spriteId;
+    s32 movementSpeedX;
+    s32 movementSpeedY;
     s32 x;
     s32 y;
 };

include/fieldmap.h

@@ -33,5 +33,6 @@ void save_serialize_map(void);
 u32 GetMetatileAttributeFromRawMetatileBehavior(u32 original, u8 bit);
 u32 MapGridGetMetatileAttributeAt(s16 x, s16 y, u8 attr);
 void MapGridSetMetatileImpassabilityAt(s32 x, s32 y, bool32 arg2);
+bool8 CameraMove(s32 x, s32 y);
 
 #endif //GUARD_FIELDMAP_H

include/overworld.h

@@ -194,6 +194,9 @@ void CB1_Overworld(void);
 void sub_80568C4(void);
 u8 GetLastUsedWarpMapSectionId(void);
 
+extern u16 *gBGTilemapBuffers1;
+extern u16 *gBGTilemapBuffers2;
+extern u16 *gBGTilemapBuffers3;
 extern u16 gHeldKeyCodeToSend;
 
 #endif //GUARD_OVERWORLD_H