Load and bind mu3io at runtime

mu3hook/mu3-dll.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <windows.h>
+
+#include "mu3io/mu3io.h"
+
+struct mu3_dll {
+    uint16_t api_version;
+    HRESULT (*init)(void);
+    HRESULT (*poll)(void);
+    void (*get_opbtns)(uint8_t *opbtn);
+    void (*get_gamebtns)(uint8_t *left, uint8_t *right);
+    void (*get_lever)(int16_t *pos);
+};
+
+struct mu3_dll_config {
+    wchar_t path[MAX_PATH];
+};
+
+extern struct mu3_dll mu3_dll;
+
+HRESULT mu3_dll_init(const struct mu3_dll_config *cfg, HINSTANCE self);