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diff --git a/sdl2/prototypes.ha b/sdl2/prototypes.ha
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+// These are the flags which may be passed to [[init]]. You should specify the
+// subsystems which you will be using in your application.
+export type init_flags = enum uint {
+	TIMER = 0x00000001u,
+	AUDIO = 0x00000010u,
+	VIDEO = 0x00000020u,
+	JOYSTICK = 0x00000200u,
+	HAPTIC = 0x00001000u,
+	GAMECONTROLLER = 0x00002000u,
+	EVENTS = 0x00004000u,
+	SENSOR = 0x00008000u,
+	NOPARACHUTE = 0x00100000u,
+	EVERYTHING = TIMER | AUDIO | VIDEO | EVENTS | JOYSTICK | HAPTIC | GAMECONTROLLER | SENSOR,
+};
+
+// This function initializes the subsystems specified by 'flags'.
+export @symbol("SDL_Init") fn init(flags: init_flags) void;
+
+// This function cleans up all initialized subsystems. You should call it upon
+// all exit conditions.
+export @symbol("SDL_Quit") fn quit() void;