Dogcows Code - chaz/yoink/blob - src/math.hh

   1
   2 /*******************************************************************************
   3
   4  Copyright (c) 2009, Charles McGarvey
   5  All rights reserved.
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   7  Redistribution   and   use  in  source  and  binary  forms,  with  or  without
   8  modification, are permitted provided that the following conditions are met:
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  10    * Redistributions  of  source  code  must retain the above copyright notice,
  11      this list of conditions and the following disclaimer.
  12    * Redistributions  in binary form must reproduce the above copyright notice,
  13      this  list of conditions and the following disclaimer in the documentation
  14      and/or other materials provided with the distribution.
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  16  THIS  SOFTWARE  IS  PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  AND  ANY  EXPRESS  OR  IMPLIED  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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  27 *******************************************************************************/
  28
  29 #ifndef _MATH_HH_
  30 #define _MATH_HH_
  31
  32 /**
  33  * @file math.hh
  34  * General math-related types and functions.
  35  */
  36
  37 #include <cmath>
  38 #include <cml/cml.h>
  39
  40 #include <iostream>
  41
  42
  43 namespace dc {
  44
  45
  46 // Basic types.
  47
  48 typedef float                           scalar;                         ///< Scalar type.
  49
  50 typedef cml::vector2f           vector2;
  51 typedef cml::vector3f           vector3;
  52 typedef cml::vector4f           vector4;
  53
  54 typedef cml::matrix33f_c        matrix3;
  55 typedef cml::matrix44f_c        matrix4;
  56
  57 typedef cml::quaternionf_p      quaternion;
  58
  59 typedef vector4                         color;
  60
  61
  62 const scalar default_epsilon = 0.00001;
  63
  64 /**
  65  * Check the equality of scalars with a certain degree of error allowed.
  66  */
  67
  68 inline bool equals(scalar a, scalar b, scalar epsilon = default_epsilon)
  69 {
  70         return std::abs(a - b) < epsilon;
  71 }
  72
  73
  74 } // namespace dc
  75
  76 #endif // _MATH_HH_
  77
  78 /** vim: set ts=4 sw=4 tw=80: *************************************************/
  79