Sega Saturn example code

man.c

/**************************************************************/
/* Trigger jumping if needed, also variable height jump logic */

Man_JumpTrigger()
{
  if ( Man.JumpFudge )
  {
    Man.JumpFudge--;
  }

  if ( Man.Mode != M_Crouch || Man_StandingRoom() )    // ok if not crouched, or there is headroom
  {
    if (Pad_Jump->Pressed)               /* jump button pressed */
    {
      if ((Man.Contact || (Man.Mode == M_Hang) || Man.JumpFudge) && Pad_Jump->Triggered && !Man.Blocking) /* and not already jumping */
      {
        if (Man.Mode == M_Hang && Pad1.Down.Pressed)
        {
          Man.Contact=0;
          Man.Mode=M_Jump;
          Man.AnimBase = LS_Jumping;    /* Change base anim to jumping */
          Man_TriggerSeq(LS_Jump);    /* start the jumping start anim */
          Man.YV.f = 0x10000;           /* and have no YV */
          Man.Y.i += 4;           /* and have no YV */
        }
        else
        {
          Pad_Jump->Triggered = 0;
          if ( !JetPacCheat )
            Man.YV.f = -0x00080000;     /* Initial jump speed */
          else
            Man.YV.f = -0x00008000;     // Initial speed in Jetpac mode
          Man.Contact = 0;          /* not on the ground any more */
          Man.JumpTime = 0;         /* just started jumping */
          Man.AnimBase = LS_Jumping;    /* Change base anim to jumping */
          Man_TriggerSeq(LS_Jump);    /* start the jumping start anim */
          Man.XV.f+=Man.FlyVel;

          if (Man.HangEnd && Man.Mode == M_Hang)  // if hanging
          {                   // and on the end of a path
            Man.HangEnd = 0;
            Man.X.i += 12*Man.Facing; // the move past end of path
            Man.JumpTime = -3;      // bit more fixed v jump time
          }
          Man.Mode = M_Jump;    /* change mode to jumping */

        }
      }
      else                        /* Already jumping */
      {
        if (Man.JumpTime++ < MaxJumpTime) /* Still in initial jump period */
          Man.YV.f -= 0x0005000;        /* So can maintain jump YV */
      }
    }
    else                      /* jump button not pressed */
    {
      Man.JumpTime = MaxJumpTime+1;     /* so can't alter YV again until landed */
    }

  }

}