1 | #include "al_siteconfig.h" |
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2 | |
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3 | #include <AL/al.h> |
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4 | #include <math.h> |
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5 | #include <stdlib.h> |
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6 | |
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7 | #include "al_debug.h" |
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8 | #include "al_types.h" |
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9 | #include "al_main.h" |
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10 | #include "al_matrix.h" |
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11 | |
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12 | /* |
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13 | * _alMatrixMul( ALmatrix *result, ALmatrix *m1, ALmatrix *m2 ) |
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14 | * |
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15 | * Multiplies m1 by m2, populating result. |
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16 | * |
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17 | * FIXME: please check my math |
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18 | */ |
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19 | void _alMatrixMul( ALmatrix *result, ALmatrix *m1, ALmatrix *m2 ) { |
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20 | int m2cols = m2->cols; |
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21 | int m1rows = m1->rows; |
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22 | int m1cols = m1->cols; |
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23 | int i; |
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24 | int j; |
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25 | int k; |
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26 | |
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27 | ALfloat sum; |
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28 | |
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29 | for(i = 0; i < m2cols; i++) { |
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30 | for(j = 0; j < m1rows; j++) { |
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31 | sum = 0.0f; |
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32 | |
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33 | for(k = 0; k < m1cols; k++) { |
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34 | sum += m1->data[j][k] * m2->data[k][i]; |
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35 | } |
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36 | |
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37 | result->data[j][i] = sum; |
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38 | } |
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39 | } |
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40 | |
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41 | return; |
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42 | } |
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43 | |
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44 | /* |
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45 | * _alMatrixAlloc( int rows, int cols ) |
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46 | * |
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47 | * Allocates, initializes, and returns a matrix with the dimensions matching |
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48 | * the passed arguments, or NULL on error. |
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49 | */ |
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50 | ALmatrix *_alMatrixAlloc(int rows, int cols) { |
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51 | ALmatrix *retval; |
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52 | int i; |
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53 | |
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54 | retval = malloc(sizeof *retval); |
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55 | if(retval == NULL) { |
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56 | return NULL; |
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57 | } |
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58 | |
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59 | retval->data = malloc(rows * sizeof *retval->data); |
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60 | if(retval->data == NULL) { |
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61 | return NULL; |
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62 | } |
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63 | |
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64 | for(i = 0; i < rows; i++) { |
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65 | /* FIXME: clean return on error */ |
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66 | retval->data[i] = malloc(cols * sizeof *retval->data[i]); |
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67 | } |
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68 | |
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69 | retval->rows = rows; |
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70 | retval->cols = cols; |
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71 | |
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72 | return retval; |
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73 | } |
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74 | |
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75 | /* |
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76 | * _alMatrixFree( ALmatrix *m ) |
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77 | * |
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78 | * Frees a matrix allocated with _alMatrixAlloc. |
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79 | */ |
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80 | void _alMatrixFree(ALmatrix *m) { |
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81 | int i; |
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82 | |
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83 | if(m == NULL) { |
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84 | return; |
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85 | } |
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86 | |
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87 | for(i = 0; i < m->rows; i++) { |
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88 | free( m->data[i] ); |
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89 | } |
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90 | |
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91 | free(m->data); |
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92 | free(m); |
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93 | |
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94 | return; |
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95 | } |
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96 | |
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