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  1. ///////////////////////////////////////////////////////////////////////////////////
  2. /// OpenGL Mathematics (glm.g-truc.net)
  3. ///
  4. /// Copyright (c) 2005 - 2013 G-Truc Creation (www.g-truc.net)
  5. /// Permission is hereby granted, free of charge, to any person obtaining a copy
  6. /// of this software and associated documentation files (the "Software"), to deal
  7. /// in the Software without restriction, including without limitation the rights
  8. /// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  9. /// copies of the Software, and to permit persons to whom the Software is
  10. /// furnished to do so, subject to the following conditions:
  11. ///
  12. /// The above copyright notice and this permission notice shall be included in
  13. /// all copies or substantial portions of the Software.
  14. ///
  15. /// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16. /// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17. /// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18. /// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19. /// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20. /// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  21. /// THE SOFTWARE.
  22. ///
  23. /// @ref gtx_fast_square_root
  24. /// @file glm/gtx/fast_square_root.hpp
  25. /// @date 2006-01-04 / 2011-06-07
  26. /// @author Christophe Riccio
  27. ///
  28. /// @see core (dependence)
  29. ///
  30. /// @defgroup gtx_fast_square_root GLM_GTX_fast_square_root
  31. /// @ingroup gtx
  32. ///
  33. /// @brief Fast but less accurate implementations of square root based functions.
  34. /// - Sqrt optimisation based on Newton's method,
  35. /// www.gamedev.net/community/forums/topic.asp?topic id=139956
  36. ///
  37. /// <glm/gtx/fast_square_root.hpp> need to be included to use these functionalities.
  38. ///////////////////////////////////////////////////////////////////////////////////
  39. #ifndef GLM_GTX_fast_square_root
  40. #define GLM_GTX_fast_square_root GLM_VERSION
  41. // Dependency:
  42. #include "../glm.hpp"
  43. #if(defined(GLM_MESSAGES) && !defined(glm_ext))
  44. # pragma message("GLM: GLM_GTX_fast_square_root extension included")
  45. #endif
  46. namespace glm
  47. {
  48. /// @addtogroup gtx_fast_square_root
  49. /// @{
  50. //! Faster than the common sqrt function but less accurate.
  51. //! From GLM_GTX_fast_square_root extension.
  52. template <typename genType>
  53. genType fastSqrt(genType const & x);
  54. //! Faster than the common inversesqrt function but less accurate.
  55. //! From GLM_GTX_fast_square_root extension.
  56. template <typename genType>
  57. genType fastInverseSqrt(genType const & x);
  58. //! Faster than the common length function but less accurate.
  59. //! From GLM_GTX_fast_square_root extension.
  60. template <typename genType>
  61. typename genType::value_type fastLength(genType const & x);
  62. //! Faster than the common distance function but less accurate.
  63. //! From GLM_GTX_fast_square_root extension.
  64. template <typename genType>
  65. typename genType::value_type fastDistance(genType const & x, genType const & y);
  66. //! Faster than the common normalize function but less accurate.
  67. //! From GLM_GTX_fast_square_root extension.
  68. template <typename genType>
  69. genType fastNormalize(genType const & x);
  70. /// @}
  71. }// namespace glm
  72. #include "fast_square_root.inl"
  73. #endif//GLM_GTX_fast_square_root