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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <string.h>
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4 #include "tgi_impl.h"
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5
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6 static int namecount;
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7
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8 struct tgi_object *tgi_create_object(const char *name)
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9 {
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10 struct tgi_object *o;
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11 int nmsize;
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12
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13 if(!(o = malloc(sizeof *o))) {
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14 tgi_log("failed to allocate memory\n");
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15 return 0;
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16 }
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17 memset(o, 0, sizeof *o);
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18
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19 nmsize = name ? strlen(name) : 15;
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20 if(!(o->name = malloc(nmsize + 1))) {
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21 tgi_log("failed to allocate name string\n");
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22 free(o);
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23 return 0;
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24 }
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25
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26 if(!name) {
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27 sprintf(o->name, "tgi_object%03d", namecount++);
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28 } else {
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29 strcpy(o->name, name);
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30 }
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31
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32 return o;
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33 }
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34
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35 void tgi_destroy_object(struct tgi_object *o)
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36 {
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37 if(o) {
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38 if(o->shape) {
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39 tgi_destroy_shape(o->shape);
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40 }
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41 free(o->name);
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42 }
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43 }
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44
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45 void tgi_set_object_shape(struct tgi_object *o, struct tgi_shape *s)
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46 {
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47 if(o->shape) {
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48 tgi_destroy_shape(o->shape);
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49 }
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50 o->shape = s;
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51 }
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52
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53 /* mat should point to an array of 16 floats (4x4 homogeneous transformation matrix) */
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54 void tgi_load_matrix(struct tgi_object *o, const float *mat)
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55 {
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56 mat4_t tmp;
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57 memcpy(tmp, mat, 16 * sizeof(float));
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58 m4_transpose(o->xform, tmp);
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59 m4_inverse(o->inv_xform, o->xform);
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60 }
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61
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62 void tgi_mult_matrix(struct tgi_object *o, const float *mat)
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63 {
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64 mat4_t tmp;
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65 memcpy(tmp, mat, 16 * sizeof(float));
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66 m4_transpose(tmp, tmp);
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67 m4_mult(o->xform, o->xform, tmp);
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68 m4_inverse(o->inv_xform, o->xform);
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69 }
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70
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71 void tgi_load_identity(struct tgi_object *o)
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72 {
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73 static const float id[] = {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1};
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74 tgi_load_matrix(o, id);
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75 }
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76
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77 void tgi_translate(struct tgi_object *o, float x, float y, float z)
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78 {
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79 float mat[] = {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1};
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80 mat[12] = x;
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81 mat[13] = y;
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82 mat[14] = z;
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83 tgi_mult_matrix(o, mat);
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84 }
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85
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86 void tgi_rotate(struct tgi_object *o, float angle, float x, float y, float z)
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87 {
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88 mat4_t mat;
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89 m4_rotate_axis(mat, DEG_TO_RAD(angle), x, y, z);
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90 m4_transpose(mat, mat);
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91 tgi_mult_matrix(o, mat[0]);
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92 }
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93
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94 void tgi_scale(struct tgi_object *o, float x, float y, float z)
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95 {
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96 float mat[] = {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1};
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97 mat[0] = x;
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98 mat[5] = y;
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99 mat[10] = z;
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100 tgi_mult_matrix(o, mat);
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101 }
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102
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103 void tgi_lookat(struct tgi_object *o, float x, float y, float z,
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104 float tx, float ty, float tz, float ux, float uy, float uz)
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105 {
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106 float mat[16];
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107 vec3_t vi, vj, vk;
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108
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109 vk = v3_normalize(v3_cons(tx - x, ty - y, tz - z));
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110 vj = v3_cons(ux, uy, uz);
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111 vi = v3_normalize(v3_cross(vj, vk));
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112 vj = v3_normalize(v3_cross(vk, vi));
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113
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114 mat[0] = vi.x; mat[1] = vj.x, mat[2] = vk.x;
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115 mat[4] = vi.y; mat[5] = vj.y, mat[6] = vk.y;
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116 mat[8] = vi.z; mat[9] = vj.z, mat[10] = vk.z;
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117 mat[3] = mat[7] = mat[11] = 0.0;
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118 mat[12] = x; mat[13] = y; mat[14] = z;
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119 mat[15] = 1.0f;
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120
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121 tgi_mult_matrix(o, mat);
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122 }
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