double time = timer_Time();
003A7F5B  call        timer_Time (408A10h)
            static double last_time = time;
003A7F60  test        byte ptr [$S1 (5103B0h)],1
003A7F67  jne         RunEngine+1E4h (3A7F74h)
003A7F69  or          dword ptr [$S1 (5103B0h)],1
003A7F70  fld         st(0)
003A7F72  jmp         RunEngine+1EAh (3A7F7Ah)
003A7F74  fld         qword ptr [last_time (5103A8h)]
            float realFrameLength = (float)(time-last_time);
003A7F7A  fsubr       st,st(1)
003A7F7C  fstp        dword ptr [ebp-8Ch]
            last_time = time;
003A7F82  fstp        qword ptr [last_time (5103A8h)]
            ENSURE(realFrameLength >= 0.0f);
003A7F88  fldz
003A7F8A  fcomp       dword ptr [ebp-8Ch]
003A7F90  fnstsw      ax
003A7F92  test        ah,41h
003A7F95  jnp         RunEngine+22Ch (3A7FBCh)
003A7F97  push        offset string "RunEngine" (4BE070h)
003A7F9C  push        95h
003A7FA1  push        offset string L"..\\..\\..\\source\\tool"... (4BE000h)
003A7FA6  push        offset suppress__ (5103A4h)
003A7FAB  push        offset string L"realFrameLength >= 0"... (4BDFD0h)
003A7FB0  call        debug_OnAssertionFailure (40A390h)
003A7FB5  add         esp,14h
003A7FB8  dec         eax
003A7FB9  je          RunEngine+22Ch (3A7FBCh)
003A7FBB  int         3