Mercurial > MadButterfly
annotate src/rotate.c @ 779:8e9481bf1cc0
Avoid float divide to improve performance
| author | Thinker K.F. Li <thinker@codemud.net> |
|---|---|
| date | Mon, 30 Aug 2010 13:43:01 +0800 |
| parents | 530bb7728546 |
| children | 586e50f82c1f |
| rev | line source |
|---|---|
| 117 | 1 #include <stdio.h> |
| 2 #include <stdlib.h> | |
| 3 #include <string.h> | |
| 4 #include <math.h> | |
|
186
530bb7728546
Move header files to $(top_srcdir)/include/ and prefixed with 'mb_'.
Thinker K.F. Li <thinker@branda.to>
parents:
185
diff
changeset
|
5 #include "mb_animate.h" |
| 117 | 6 |
| 7 static float comp_mb_timeval_ratio(const mb_timeval_t *a, | |
| 8 const mb_timeval_t *b) { | |
| 9 float ratio; | |
| 10 | |
| 11 ratio = (float)MB_TIMEVAL_SEC(a) * 1000000.0 + (float)MB_TIMEVAL_USEC(a); | |
| 12 ratio /= (float)MB_TIMEVAL_SEC(b) * 1000000.0 + (float)MB_TIMEVAL_USEC(b); | |
| 13 return ratio; | |
| 14 } | |
| 15 | |
| 16 /*! \brief Animation action to rotate a coordinate. | |
| 17 */ | |
| 18 struct _mb_rotate { | |
| 19 mb_action_t action; | |
| 20 | |
| 21 co_aix angle1, angle2; | |
| 22 coord_t *coord; | |
| 23 | |
| 24 mb_timeval_t start_time; | |
| 25 const mb_timeval_t *playing_time; | |
| 26 }; | |
| 27 typedef struct _mb_rotate mb_rotate_t; | |
| 28 | |
| 29 static void mb_rotate_start(mb_action_t *act, | |
| 30 const mb_timeval_t *now, | |
| 31 const mb_timeval_t *playing_time, | |
| 32 redraw_man_t *rdman) { | |
| 33 mb_rotate_t *rotate = (mb_rotate_t *)act; | |
| 34 co_aix *matrix; | |
| 35 float _sin, _cos; | |
| 36 | |
| 37 _sin = sinf(rotate->angle1); | |
| 38 _cos = cosf(rotate->angle1); | |
| 39 | |
| 40 matrix = rotate->coord->matrix; | |
| 41 memset(matrix, 0, sizeof(co_aix) * 6); | |
| 42 matrix[0] = _cos; | |
| 43 matrix[1] = -_sin; | |
| 44 matrix[3] = _sin; | |
| 45 matrix[4] = _cos; | |
| 46 rdman_coord_changed(rdman, rotate->coord); | |
| 47 | |
| 48 MB_TIMEVAL_CP(&rotate->start_time, now); | |
| 49 rotate->playing_time = playing_time; | |
| 50 } | |
| 51 | |
| 52 static void mb_rotate_step(mb_action_t *act, const mb_timeval_t *now, | |
| 53 redraw_man_t *rdman) { | |
| 54 mb_rotate_t *rotate = (mb_rotate_t *)act; | |
| 55 mb_timeval_t diff; | |
| 56 co_aix *matrix; | |
| 57 float ratio; | |
| 58 float angle; | |
| 59 float _sin, _cos; | |
| 60 | |
| 61 MB_TIMEVAL_CP(&diff, now); | |
| 62 MB_TIMEVAL_DIFF(&diff, &rotate->start_time); | |
| 63 ratio = comp_mb_timeval_ratio(&diff, rotate->playing_time); | |
| 64 | |
| 65 angle = rotate->angle1 * (1 - ratio) + rotate->angle2 * ratio; | |
| 66 _sin = sinf(angle); | |
| 67 _cos = cosf(angle); | |
| 68 | |
| 69 matrix = rotate->coord->matrix; | |
| 70 matrix[0] = _cos; | |
| 71 matrix[1] = -_sin; | |
| 72 matrix[3] = _sin; | |
| 73 matrix[4] = _cos; | |
| 74 rdman_coord_changed(rdman, rotate->coord); | |
| 75 } | |
| 76 | |
| 77 static void mb_rotate_stop(mb_action_t *act, const mb_timeval_t *now, | |
| 78 redraw_man_t *rdman) { | |
| 79 mb_rotate_t *rotate = (mb_rotate_t *)act; | |
| 80 co_aix *matrix; | |
| 81 float _sin, _cos; | |
| 82 | |
| 83 _sin = sinf(rotate->angle2); | |
| 84 _cos = cosf(rotate->angle2); | |
| 85 | |
| 86 matrix = rotate->coord->matrix; | |
| 87 matrix[0] = _cos; | |
| 88 matrix[1] = -_sin; | |
| 89 matrix[3] = _sin; | |
| 90 matrix[4] = _cos; | |
| 91 rdman_coord_changed(rdman, rotate->coord); | |
| 92 } | |
| 93 | |
| 94 static void mb_rotate_free(mb_action_t *act) { | |
| 95 free(act); | |
| 96 } | |
| 97 | |
| 98 mb_action_t *mb_rotate_new(float angle1, float angle2, | |
| 99 coord_t *coord, | |
| 100 mb_word_t *word) { | |
| 101 mb_rotate_t *rotate; | |
| 102 | |
| 103 rotate = (mb_rotate_t *)malloc(sizeof(mb_rotate_t)); | |
| 104 if(rotate == NULL) | |
| 105 return NULL; | |
| 106 | |
| 107 rotate->angle1 = angle1; | |
| 108 rotate->angle2 = angle2; | |
| 109 rotate->coord = coord; | |
| 110 | |
| 111 rotate->action.start = mb_rotate_start; | |
| 112 rotate->action.step = mb_rotate_step; | |
| 113 rotate->action.stop = mb_rotate_stop; | |
| 114 rotate->action.free = mb_rotate_free; | |
| 115 | |
| 116 mb_word_add_action(word, (mb_action_t *)rotate); | |
| 117 | |
| 118 return (mb_action_t *)rotate; | |
| 119 } |