/*******************************************************************************

 Copyright (c) 2009, Charles McGarvey
 All rights reserved.
 
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 modification, are permitted provided that the following conditions are met:
 
   * Redistributions  of  source  code  must retain the above copyright notice,
     this list of conditions and the following disclaimer.
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     this  list of conditions and the following disclaimer in the documentation
     and/or other materials provided with the distribution.
 
 THIS  SOFTWARE  IS  PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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*******************************************************************************/

#ifndef _MATH_HH_
#define _MATH_HH_

/**
 * @file math.hh
 * General math-related types and functions.
 */

#include <cmath>
#include <cml/cml.h>

#include <iostream>


namespace dc {


// Basic types.

typedef float				scalar;				///< Scalar type.

typedef cml::vector2f		vector2;
typedef cml::vector3f		vector3;
typedef cml::vector4f		vector4;

typedef cml::matrix33f_c	matrix3;
typedef cml::matrix44f_c	matrix4;

typedef cml::quaternionf_p	quaternion;

typedef vector4				color;


const scalar default_epsilon = 0.00001;

/**
 * Check the equality of scalars with a certain degree of error allowed.
 */

inline bool equals(scalar a, scalar b, scalar epsilon = default_epsilon)
{
	return std::abs(a - b) < epsilon;
}


} // namespace dc

#endif // _MATH_HH_

/** vim: set ts=4 sw=4 tw=80: *************************************************/