glm/test/gtc/gtc_round.cpp

///////////////////////////////////////////////////////////////////////////////////
/// OpenGL Mathematics (glm.g-truc.net)
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/// @file test/gtc/gtc_round.cpp
/// @date 2014-11-03 / 2014-11-03
/// @author Christophe Riccio
///
/// @see core (dependence)
/// @see gtc_round (dependence)
///////////////////////////////////////////////////////////////////////////////////

#include <glm/gtc/round.hpp>
#include <glm/gtc/type_precision.hpp>
#include <glm/gtc/vec1.hpp>
#include <vector>
#include <ctime>
#include <cstdio>

namespace isPowerOfTwo
{
	template <typename genType>
	struct type
	{
		genType		Value;
		bool		Return;
	};

	int test_int16()
	{
		type<glm::int16> const Data[] =
		{
			{0x0001, true},
			{0x0002, true},
			{0x0004, true},
			{0x0080, true},
			{0x0000, true},
			{0x0003, false}
		};

		int Error(0);

		for(std::size_t i = 0, n = sizeof(Data) / sizeof(type<glm::int16>); i < n; ++i)
		{
			bool Result = glm::isPowerOfTwo(Data[i].Value);
			Error += Data[i].Return == Result ? 0 : 1;
		}

		return Error;
	}

	int test_uint16()
	{
		type<glm::uint16> const Data[] =
		{
			{0x0001, true},
			{0x0002, true},
			{0x0004, true},
			{0x0000, true},
			{0x0000, true},
			{0x0003, false}
		};

		int Error(0);

		for(std::size_t i = 0, n = sizeof(Data) / sizeof(type<glm::uint16>); i < n; ++i)
		{
			bool Result = glm::isPowerOfTwo(Data[i].Value);
			Error += Data[i].Return == Result ? 0 : 1;
		}

		return Error;
	}

	int test_int32()
	{
		type<int> const Data[] =
		{
			{0x00000001, true},
			{0x00000002, true},
			{0x00000004, true},
			{0x0000000f, false},
			{0x00000000, true},
			{0x00000003, false}
		};

		int Error(0);

		for(std::size_t i = 0, n = sizeof(Data) / sizeof(type<int>); i < n; ++i)
		{
			bool Result = glm::isPowerOfTwo(Data[i].Value);
			Error += Data[i].Return == Result ? 0 : 1;
		}

		for(std::size_t i = 0, n = sizeof(Data) / sizeof(type<int>); i < n; ++i)
		{
			glm::bvec1 Result = glm::isPowerOfTwo(glm::ivec1(Data[i].Value));
			Error += glm::all(glm::equal(glm::bvec1(Data[i].Return), Result)) ? 0 : 1;
		}

		for(std::size_t i = 0, n = sizeof(Data) / sizeof(type<int>); i < n; ++i)
		{
			glm::bvec2 Result = glm::isPowerOfTwo(glm::ivec2(Data[i].Value));
			Error += glm::all(glm::equal(glm::bvec2(Data[i].Return), Result)) ? 0 : 1;
		}

		for(std::size_t i = 0, n = sizeof(Data) / sizeof(type<int>); i < n; ++i)
		{
			glm::bvec3 Result = glm::isPowerOfTwo(glm::ivec3(Data[i].Value));
			Error += glm::all(glm::equal(glm::bvec3(Data[i].Return), Result)) ? 0 : 1;
		}

		for(std::size_t i = 0, n = sizeof(Data) / sizeof(type<int>); i < n; ++i)
		{
			glm::bvec4 Result = glm::isPowerOfTwo(glm::ivec4(Data[i].Value));
			Error += glm::all(glm::equal(glm::bvec4(Data[i].Return), Result)) ? 0 : 1;
		}

		return Error;
	}

	int test_uint32()
	{
		type<glm::uint> const Data[] =
		{
			{0x00000001, true},
			{0x00000002, true},
			{0x00000004, true},
			{0x80000000, true},
			{0x00000000, true},
			{0x00000003, false}
		};

		int Error(0);

		for(std::size_t i = 0, n = sizeof(Data) / sizeof(type<glm::uint>); i < n; ++i)
		{
			bool Result = glm::isPowerOfTwo(Data[i].Value);
			Error += Data[i].Return == Result ? 0 : 1;
		}

		return Error;
	}

	int test()
	{
		int Error(0);

		Error += test_int16();
		Error += test_uint16();
		Error += test_int32();
		Error += test_uint32();

		return Error;
	}
}//isPowerOfTwo

namespace ceilPowerOfTwo
{
	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 genType>
	GLM_FUNC_QUALIFIER genType ceilPowerOfTwo_loop(genType value)
	{
		return glm::isPowerOfTwo(value) ? value : highestBitValue(value) << 1;
	}

	template <typename genType>
	struct type
	{
		genType		Value;
		genType		Return;
	};

	int test_int32()
	{
		type<glm::int32> const Data[] =
		{
			{0x0000ffff, 0x00010000},
			{-3, -4},
			{-8, -8},
			{0x00000001, 0x00000001},
			{0x00000002, 0x00000002},
			{0x00000004, 0x00000004},
			{0x00000007, 0x00000008},
			{0x0000fff0, 0x00010000},
			{0x0000f000, 0x00010000},
			{0x08000000, 0x08000000},
			{0x00000000, 0x00000000},
			{0x00000003, 0x00000004}
		};

		int Error(0);

		for(std::size_t i = 0, n = sizeof(Data) / sizeof(type<glm::int32>); i < n; ++i)
		{
			glm::int32 Result = glm::ceilPowerOfTwo(Data[i].Value);
			Error += Data[i].Return == Result ? 0 : 1;
		}

		return Error;
	}

	int test_uint32()
	{
		type<glm::uint32> const Data[] =
		{
			{0x00000001, 0x00000001},
			{0x00000002, 0x00000002},
			{0x00000004, 0x00000004},
			{0x00000007, 0x00000008},
			{0x0000ffff, 0x00010000},
			{0x0000fff0, 0x00010000},
			{0x0000f000, 0x00010000},
			{0x80000000, 0x80000000},
			{0x00000000, 0x00000000},
			{0x00000003, 0x00000004}
		};

		int Error(0);

		for(std::size_t i = 0, n = sizeof(Data) / sizeof(type<glm::uint32>); i < n; ++i)
		{
			glm::uint32 Result = glm::ceilPowerOfTwo(Data[i].Value);
			Error += Data[i].Return == Result ? 0 : 1;
		}

		return Error;
	}

	int perf()
	{
		int Error(0);

		std::vector<glm::uint> v;
		v.resize(100000000);

		std::clock_t Timestramp0 = std::clock();

		for(glm::uint32 i = 0, n = static_cast<glm::uint>(v.size()); i < n; ++i)
			v[i] = ceilPowerOfTwo_loop(i);

		std::clock_t Timestramp1 = std::clock();

		for(glm::uint32 i = 0, n = static_cast<glm::uint>(v.size()); i < n; ++i)
			v[i] = glm::ceilPowerOfTwo(i);

		std::clock_t Timestramp2 = std::clock();

		std::printf("ceilPowerOfTwo_loop: %d clocks\n", static_cast<unsigned int>(Timestramp1 - Timestramp0));
		std::printf("glm::ceilPowerOfTwo: %d clocks\n", static_cast<unsigned int>(Timestramp2 - Timestramp1));

		return Error;
	}

	int test()
	{
		int Error(0);

		Error += test_int32();
		Error += test_uint32();

		return Error;
	}
}//namespace ceilPowerOfTwo

int main()
{
	int Error(0);

	Error += isPowerOfTwo::test();
	Error += ceilPowerOfTwo::test();

#	ifdef NDEBUG
		Error += ceilPowerOfTwo::perf();
#	endif//NDEBUG

	return Error;
}