class NativeContext {
    uint64_t* m_pReturn;
    uint32_t m_nArgCount;
    uint64_t* m_pArgs;
public:
    template<typename T> void Push(T val) { *(T*)(m_pArgs + m_nArgCount++) = val; }
    template<typename T> T GetResult() { return *(T*)m_pReturn; }
};

// Calling ENTITY::GET_ENTITY_COORDS
Vector3 GetEntityCoords(Entity entity) {
    NativeContext ctx;
    ctx.Push(entity);
    ctx.Push(true); // alive flag
    InvokeNative(0x3FEF770D40960D5A, &ctx);
    return ctx.GetResult<Vector3>();
}