math_tools.hpp

#pragma once

//-----------------------------------------------------------------------------
// System Includes
//-----------------------------------------------------------------------------
#pragma region

#include <stdint.h>
#include <math.h>

#pragma endregion

//-----------------------------------------------------------------------------
// Declarations and Definitions
//-----------------------------------------------------------------------------
namespace pathtracing
{

//-------------------------------------------------------------------------
// Declarations and Definitions: Constants
//-------------------------------------------------------------------------

const double g_pi = 3.14159265358979323846;

//-------------------------------------------------------------------------
// Declarations and Definitions: Utilities
//-------------------------------------------------------------------------

constexpr double Clamp(
	double x, double low = 0.0, double high = 1.0) noexcept
{

	return (x < high) ? ((x > low) ? x : low) : high;
}

inline uint8_t ToByte(double x, double gamma = 2.2) noexcept
{
	return static_cast<uint8_t>(Clamp(255.0 * pow(x, 1 / gamma),
									  0.0, 255.0));
}
} // namespace pathtracing