private static void UpdateWalkingSpeed(MutableMarioState marioState)
        {
            float maxTargetSpeed;
            float targetSpeed;

            bool slowSurface = false;
            if (slowSurface)
                maxTargetSpeed = 24.0f;
            else
                maxTargetSpeed = 32.0f;

            targetSpeed = marioState.IntendedMagnitude < maxTargetSpeed ? marioState.IntendedMagnitude : maxTargetSpeed;

            if (marioState.HSpeed <= 0.0f)
                marioState.HSpeed += 1.1f;
            else if (marioState.HSpeed <= targetSpeed)
                marioState.HSpeed += 1.1f - marioState.HSpeed / 43.0f;
            else
                marioState.HSpeed -= 1.0f;

            if (marioState.HSpeed > 48.0f)
                marioState.HSpeed = 48.0f;

            marioState.MarioAngle = MoreMath.NormalizeAngleUshort(
                marioState.IntendedAngle - CalculatorUtilities.ApproachInt(
                    MoreMath.NormalizeAngleShort(marioState.IntendedAngle - marioState.MarioAngle), 0, 0x800, 0x800));
            ApplySlopeAccel(marioState);
        }