Separate air_function chances for rooms and corridors

plugins/apple/apple.c

@@ -42,7 +42,8 @@ static void spawn_apple(int x, int y, enum mg_context ctx)
 __attribute__((constructor)) static void init()
 {
 	register_air_function((struct generator_function) {
-		.chance = 25,
+		.corridor_chance = 25,
+		.room_chance = 50,
 		.callback = &spawn_apple,
 	});
 }

plugins/cherry/cherry.c

@@ -62,7 +62,8 @@ static void spawn_cherry(int x, int y, enum mg_context ctx)
 __attribute__((constructor)) static void init()
 {
 	register_air_function((struct generator_function) {
-		.chance = 100,
+		.corridor_chance = 100,
+		.room_chance = 100,
 		.callback = &spawn_cherry,
 	});
 }

plugins/game/game.c

@@ -334,7 +334,7 @@ static void mapgen_set_air(int x, int y, enum mg_context ctx)
 	for (struct list *ptr = air_functions; ptr != NULL; ptr = ptr->next) {
 		struct generator_function *func = ptr->element;
 
-		if (rand() % func->chance == 0)
+		if (rand() % (ctx == MG_CTX_CORRIDOR ? func->corridor_chance : func->room_chance) == 0)
 			func->callback(x, y, ctx);
 	}
 }

plugins/game/game.h

@@ -71,7 +71,8 @@ enum mg_context
 
 struct generator_function
 {
-	int chance;
+	int corridor_chance;
+	int room_chance;
 	void (*callback)(int x, int y, enum mg_context ctx);
 };
 

plugins/monster/monster.c

@@ -68,7 +68,8 @@ static void spawn_monster(int x, int y, enum mg_context ctx)
 __attribute__((constructor)) static void init()
 {
 	register_air_function((struct generator_function) {
-		.chance = 50,
+		.corridor_chance = 50,
+		.room_chance = 200,
 		.callback = &spawn_monster,
 	});
 }