src/gromacs/math/3dtransforms.h

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  37 #ifndef GMX_MATH_3DTRANSFORMS_H
  38 #define GMX_MATH_3DTRANSFORMS_H
  39
  40 #include <stdio.h>
  41
  42 #include "gromacs/math/vectypes.h"
  43 #include "gromacs/utility/real.h"
  44
  45 /** Index for the fourth dimension for `vec4`. */
  46 #define WW 3
  47
  48 /*! \brief
  49  * 4D vector type used in 3D transformations.
  50  *
  51  * In \Gromacs, only a limited set of 3D transformations are used, and all of
  52  * them operate on coordinates, so the fourth element is assumed to be one and
  53  * ignored in all contexts.
  54  */
  55 typedef real vec4[4];
  56
  57 /*! \brief
  58  * 4D matrix type used in 3D transformations.
  59  */
  60 typedef real mat4[4][4];
  61
  62 void gmx_mat4_copy(mat4 a, mat4 b);
  63
  64 void gmx_mat4_transform_point(mat4 m, const rvec x, vec4 v);
  65
  66 /*! \brief
  67  * Computes the product of two `mat4` matrices as A = B * C.
  68  *
  69  * Note that the order of operands is different from mmul() in vec.h!
  70  */
  71 void gmx_mat4_mmul(mat4 A, mat4 B, mat4 C);
  72
  73 void gmx_mat4_init_unity(mat4 m);
  74
  75 void gmx_mat4_init_rotation(int axis, real angle, mat4 A);
  76
  77 void gmx_mat4_init_translation(real tx, real ty, real tz, mat4 A);
  78
  79 void gmx_mat4_print(FILE *fp, const char *s, mat4 A);
  80
  81 void gmx_vec4_print(FILE *fp, const char *s, vec4 a);
  82
  83 #endif