private uint GetWidthInTilesLog2(uint widthInTiles)
{
//if (!IsPowerOf2(widthInTiles)) {
if (widthInTiles != 0 && !BitTwiddle.IsPowerOf2(widthInTiles))
{
throw new System.Exception("Map width in tiles must be a power of 2");
}
return(BitTwiddle.Log2OfPowerOf2(widthInTiles));
}
public void Log2OfPowerOf2()
{
Assert.AreEqual(0u, BitTwiddle.Log2OfPowerOf2(1));
Assert.AreEqual(1u, BitTwiddle.Log2OfPowerOf2(2));
Assert.AreEqual(2u, BitTwiddle.Log2OfPowerOf2(4));
Assert.AreEqual(3u, BitTwiddle.Log2OfPowerOf2(8));
Assert.AreEqual(4u, BitTwiddle.Log2OfPowerOf2(16));
Assert.AreEqual(5u, BitTwiddle.Log2OfPowerOf2(32));
Assert.AreEqual(6u, BitTwiddle.Log2OfPowerOf2(64));
Assert.AreEqual(7u, BitTwiddle.Log2OfPowerOf2(128));
Assert.AreEqual(8u, BitTwiddle.Log2OfPowerOf2(256));
Assert.AreEqual(9u, BitTwiddle.Log2OfPowerOf2(512));
Assert.AreEqual(31u, BitTwiddle.Log2OfPowerOf2(1u << 31));
}
public void IsPowerOf2()
{
Assert.IsTrue(BitTwiddle.IsPowerOf2(1));
Assert.IsTrue(BitTwiddle.IsPowerOf2(2));
Assert.IsTrue(BitTwiddle.IsPowerOf2(4));
Assert.IsTrue(BitTwiddle.IsPowerOf2(8));
Assert.IsTrue(BitTwiddle.IsPowerOf2(16));
Assert.IsTrue(BitTwiddle.IsPowerOf2(32));
Assert.IsTrue(BitTwiddle.IsPowerOf2(64));
Assert.IsTrue(BitTwiddle.IsPowerOf2(128));
Assert.IsTrue(BitTwiddle.IsPowerOf2(256));
Assert.IsTrue(BitTwiddle.IsPowerOf2(512));
Assert.IsTrue(BitTwiddle.IsPowerOf2(1u << 31));
Assert.IsFalse(BitTwiddle.IsPowerOf2(0));
Assert.IsFalse(BitTwiddle.IsPowerOf2(3));
Assert.IsFalse(BitTwiddle.IsPowerOf2(5));
Assert.IsFalse(BitTwiddle.IsPowerOf2(6));
Assert.IsFalse(BitTwiddle.IsPowerOf2(7));
}
