initial commit

lib/glm/gtx/bit.inl

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+/// @ref gtx_bit
+/// @file glm/gtx/bit.inl
+
+namespace glm
+{
+	///////////////////
+	// highestBitValue
+
+	template <typename genIUType>
+	GLM_FUNC_QUALIFIER genIUType highestBitValue(genIUType Value)
+	{
+		genIUType tmp = Value;
+		genIUType result = genIUType(0);
+		while(tmp)
+		{
+			result = (tmp & (~tmp + 1)); // grab lowest bit
+			tmp &= ~result; // clear lowest bit
+		}
+		return result;
+	}
+
+	template <typename T, precision P, template <typename, precision> class vecType>
+	GLM_FUNC_QUALIFIER vecType<T, P> highestBitValue(vecType<T, P> const & v)
+	{
+		return detail::functor1<T, T, P, vecType>::call(highestBitValue, v);
+	}
+
+	///////////////////
+	// lowestBitValue
+
+	template <typename genIUType>
+	GLM_FUNC_QUALIFIER genIUType lowestBitValue(genIUType Value)
+	{
+		return (Value & (~Value + 1));
+	}
+
+	template <typename T, precision P, template <typename, precision> class vecType>
+	GLM_FUNC_QUALIFIER vecType<T, P> lowestBitValue(vecType<T, P> const & v)
+	{
+		return detail::functor1<T, T, P, vecType>::call(lowestBitValue, v);
+	}
+
+	///////////////////
+	// powerOfTwoAbove
+
+	template <typename genType>
+	GLM_FUNC_QUALIFIER genType powerOfTwoAbove(genType value)
+	{
+		return isPowerOfTwo(value) ? value : highestBitValue(value) << 1;
+	}
+
+	template <typename T, precision P, template <typename, precision> class vecType>
+	GLM_FUNC_QUALIFIER vecType<T, P> powerOfTwoAbove(vecType<T, P> const & v)
+	{
+		return detail::functor1<T, T, P, vecType>::call(powerOfTwoAbove, v);
+	}
+
+	///////////////////
+	// powerOfTwoBelow
+
+	template <typename genType>
+	GLM_FUNC_QUALIFIER genType powerOfTwoBelow(genType value)
+	{
+		return isPowerOfTwo(value) ? value : highestBitValue(value);
+	}
+
+	template <typename T, precision P, template <typename, precision> class vecType>
+	GLM_FUNC_QUALIFIER vecType<T, P> powerOfTwoBelow(vecType<T, P> const & v)
+	{
+		return detail::functor1<T, T, P, vecType>::call(powerOfTwoBelow, v);
+	}
+
+	/////////////////////
+	// powerOfTwoNearest
+
+	template <typename genType>
+	GLM_FUNC_QUALIFIER genType powerOfTwoNearest(genType value)
+	{
+		if(isPowerOfTwo(value))
+			return value;
+
+		genType const prev = highestBitValue(value);
+		genType const next = prev << 1;
+		return (next - value) < (value - prev) ? next : prev;
+	}
+
+	template <typename T, precision P, template <typename, precision> class vecType>
+	GLM_FUNC_QUALIFIER vecType<T, P> powerOfTwoNearest(vecType<T, P> const & v)
+	{
+		return detail::functor1<T, T, P, vecType>::call(powerOfTwoNearest, v);
+	}
+
+}//namespace glm