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    37. 

  37. <div class="title">fast_square_root.hpp</div>  </div>
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  39. <div class="contents">
    40. 

  40. <div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 
    41. 

  41. <a name="l00002"></a>00002 <span class="comment">// OpenGL Mathematics Copyright (c) 2005 - 2011 G-Truc Creation (www.g-truc.net)</span>
    42. 

  42. <a name="l00004"></a>00004 <span class="comment"></span><span class="comment">// Created : 2006-01-04</span>
    43. 

  43. <a name="l00005"></a>00005 <span class="comment">// Updated : 2008-10-07</span>
    44. 

  44. <a name="l00006"></a>00006 <span class="comment">// Licence : This source is under MIT License</span>
    45. 

  45. <a name="l00007"></a>00007 <span class="comment">// File    : glm/gtx/fast_square_root.hpp</span>
    46. 

  46. <a name="l00009"></a>00009 <span class="comment"></span><span class="comment">// Dependency:</span>
    47. 

  47. <a name="l00010"></a>00010 <span class="comment">// - GLM core</span>
    48. 

  48. <a name="l00012"></a>00012 <span class="comment"></span><span class="comment">// Note:</span>
    49. 

  49. <a name="l00013"></a>00013 <span class="comment">// - Sqrt optimisation based on Newton&#39;s method, </span>
    50. 

  50. <a name="l00014"></a>00014 <span class="comment">// www.gamedev.net/community/forums/topic.asp?topic id=139956</span>
    51. 

  51. <a name="l00016"></a>00016 <span class="comment"></span>
    52. 

  52. <a name="l00017"></a>00017 <span class="preprocessor">#ifndef glm_gtx_fast_square_root</span>
    53. 

  53. <a name="l00018"></a>00018 <span class="preprocessor"></span><span class="preprocessor">#define glm_gtx_fast_square_root</span>
    54. 

  54. <a name="l00019"></a>00019 <span class="preprocessor"></span>
    55. 

  55. <a name="l00020"></a>00020 <span class="comment">// Dependency:</span>
    56. 

  56. <a name="l00021"></a>00021 <span class="preprocessor">#include &quot;../glm.hpp&quot;</span>
    57. 

  57. <a name="l00022"></a>00022 
    58. 

  58. <a name="l00023"></a>00023 <span class="preprocessor">#if(defined(GLM_MESSAGES) &amp;&amp; !defined(glm_ext))</span>
    59. 

  59. <a name="l00024"></a>00024 <span class="preprocessor"></span><span class="preprocessor">#       pragma message(&quot;GLM: GLM_GTX_fast_square_root extension included&quot;)</span>
    60. 

  60. <a name="l00025"></a>00025 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
    61. 

  61. <a name="l00026"></a>00026 <span class="preprocessor"></span>
    62. 

  62. <a name="l00027"></a>00027 <span class="keyword">namespace </span>glm{
    63. 

  63. <a name="l00028"></a>00028 <span class="keyword">namespace </span>gtx{
    64. 

  64. <a name="l00029"></a><a class="code" href="a00182.html">00029</a> <span class="keyword">namespace </span>fast_square_root      
    65. 

  65. <a name="l00030"></a>00030 {
    66. 

  66. <a name="l00033"></a>00033 
    67. 

  67. <a name="l00036"></a>00036         <span class="keyword">template</span> &lt;<span class="keyword">typename</span> genType&gt; 
    68. 

  68. <a name="l00037"></a>00037         genType <a class="code" href="a00262.html#gaced2a1b7a161290e4d401967607d56db" title="Faster than the common sqrt function but less accurate.">fastSqrt</a>(genType <span class="keyword">const</span> &amp; x);
    69. 

  69. <a name="l00038"></a>00038 
    70. 

  70. <a name="l00041"></a>00041         <span class="keyword">template</span> &lt;<span class="keyword">typename</span> genType&gt; 
    71. 

  71. <a name="l00042"></a>00042         genType <a class="code" href="a00262.html#ga1858a37f06c79e17f287bbaa8f75b08e" title="Faster than the common inversesqrt function but less accurate.">fastInverseSqrt</a>(genType <span class="keyword">const</span> &amp; x);
    72. 

  72. <a name="l00043"></a>00043                 
    73. 

  73. <a name="l00046"></a>00046         <span class="keyword">template</span> &lt;<span class="keyword">typename</span> genType&gt; 
    74. 

  74. <a name="l00047"></a>00047         <span class="keyword">typename</span> genType::value_type <a class="code" href="a00262.html#gada4490e940c0c4e08beab6db793f8934" title="Faster than the common length function but less accurate.">fastLength</a>(genType <span class="keyword">const</span> &amp; x);
    75. 

  75. <a name="l00048"></a>00048 
    76. 

  76. <a name="l00051"></a>00051         <span class="keyword">template</span> &lt;<span class="keyword">typename</span> genType&gt; 
    77. 

  77. <a name="l00052"></a>00052         <span class="keyword">typename</span> genType::value_type <a class="code" href="a00262.html#ga68162c92de0e592216be943345169da7" title="Faster than the common distance function but less accurate.">fastDistance</a>(genType <span class="keyword">const</span> &amp; x, genType <span class="keyword">const</span> &amp; y);
    78. 

  78. <a name="l00053"></a>00053 
    79. 

  79. <a name="l00056"></a>00056         <span class="keyword">template</span> &lt;<span class="keyword">typename</span> genType&gt; 
    80. 

  80. <a name="l00057"></a>00057         genType <a class="code" href="a00262.html#ga7e785d24d7bbac63f273baf9af1160da" title="Faster than the common normalize function but less accurate.">fastNormalize</a>(genType <span class="keyword">const</span> &amp; x);
    81. 

  81. <a name="l00058"></a>00058 
    82. 

  82. <a name="l00060"></a>00060 }<span class="comment">// namespace fast_square_root</span>
    83. 

  83. <a name="l00061"></a>00061 }<span class="comment">// namespace gtx</span>
    84. 

  84. <a name="l00062"></a>00062 }<span class="comment">// namespace glm</span>
    85. 

  85. <a name="l00063"></a>00063 
    86. 

  86. <a name="l00064"></a>00064 <span class="preprocessor">#include &quot;fast_square_root.inl&quot;</span>
    87. 

  87. <a name="l00065"></a>00065 
    88. 

  88. <a name="l00066"></a>00066 <span class="keyword">namespace </span>glm{<span class="keyword">using namespace </span>gtx::fast_square_root;}
    89. 

  89. <a name="l00067"></a>00067 
    90. 

  90. <a name="l00068"></a>00068 <span class="preprocessor">#endif//glm_gtx_fast_square_root</span>
    91. 

  91. </pre></div></div>
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