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nuclear@3
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1 #include <stdlib.h>
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2 #include <string.h>
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3 #include <ctype.h>
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4 #include <limits.h>
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5 #include <assert.h>
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6 #include <vector>
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7 #include <map>
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8 #include <string>
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9 #include <sstream>
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10 #include <iomanip>
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11 #include "scene.h"
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12
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13 using namespace std;
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14
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15 #define COMMANDS \
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16 CMD(V), \
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17 CMD(VN), \
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18 CMD(VT), \
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19 CMD(F), \
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20 CMD(O), \
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21 CMD(G), \
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22 CMD(MTLLIB), \
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23 CMD(USEMTL), \
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24 CMD(NEWMTL), \
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25 CMD(KA), \
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26 CMD(KD), \
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27 CMD(KS), \
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28 CMD(NS), \
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29 CMD(NI), \
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30 CMD(D), \
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31 CMD(TR), \
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32 CMD(MAP_KD), \
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33 CMD(MAP_KS), \
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34 CMD(MAP_NS), \
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35 CMD(MAP_D), \
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36 CMD(REFL), \
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37 CMD(BUMP)
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38
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39 #define CMD(x) CMD_##x
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40 enum {
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41 COMMANDS,
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42 CMD_UNK
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43 };
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44 #undef CMD
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45
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46 #define CMD(x) #x
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47 static const char *cmd_names[] = {
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48 COMMANDS,
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49 0
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50 };
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51 #undef CMD
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52
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53
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54 struct ObjFace {
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55 int elem;
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56 int v[4], n[4], t[4];
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57 };
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58
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59 struct ObjFile {
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60 string cur_obj, cur_mat;
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61 vector<Vector3> v, vn;
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62 vector<Vector2> vt;
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63 vector<ObjFace> f;
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64 };
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65
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66 typedef Vector3 Color;
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67
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68 struct ObjMat {
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69 string name; // newmtl <name>
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70 Color ambient, diffuse, specular; // Ka, Kd, Ks
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71 float shininess; // Ns
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72 float ior; // Ni
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73 float alpha; // d, Tr
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74
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75 string tex_dif, tex_spec, tex_shin, tex_alpha; // map_Kd, map_Ks, map_Ns, map_d
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76 string tex_refl; // refl -type sphere|cube file
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77 string tex_bump; // bump
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78
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79 ObjMat() { reset(); }
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80
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81 void reset() {
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82 ambient = diffuse = Color(0.5, 0.5, 0.5);
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83 specular = Color(0.0, 0.0, 0.0);
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84 name = tex_dif = tex_spec = tex_shin = tex_alpha = tex_refl = tex_bump = "";
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85 shininess = 0;
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86 ior = alpha = 1;
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87 }
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88 };
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89
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90 static bool read_materials(FILE *fp, vector<ObjMat> *vmtl);
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91 static Object *cons_object(ObjFile *obj);
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92
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93 static int get_cmd(char *str);
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94 static bool is_int(const char *str);
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95 static bool is_float(const char *str);
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96 static bool parse_vec(Vector3 *vec);
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97 static bool parse_color(Color *col);
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98 static bool parse_face(ObjFace *face);
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99 static const char *parse_map();
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100
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101
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102 static map<string, Material> matlib;
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103
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104
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105 #define INVALID_IDX INT_MIN
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106
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107 #define SEP " \t\n\r\v"
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108 #define BUF_SZ 512
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109 bool Scene::load_obj(FILE *fp)
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110 {
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111 static int seq;
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112 char cur_name[16];
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113 stringstream sstr;
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114
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115 ObjFile obj;
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116
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117 sprintf(cur_name, "default%02d.obj", seq++);
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118 obj.cur_obj = cur_name;
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119
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120 int prev_cmd = 0, obj_added = 0;
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121 for(;;) {
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122 Vector3 vec;
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123 ObjFace face;
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124
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125 char line[BUF_SZ];
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126 fgets(line, sizeof line, fp);
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127 if(feof(fp)) {
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128 break;
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129 }
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130
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131 char *tok;
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132 if(!(tok = strtok(line, SEP))) {
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133 continue; // ignore empty lines
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134 }
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135
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136 int cmd;
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137 if((cmd = get_cmd(tok)) == -1) {
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138 continue; // ignore unknown commands ...
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139 }
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140
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141 switch(cmd) {
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142 case CMD_V:
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143 if(!parse_vec(&vec)) {
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144 continue;
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145 }
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146 obj.v.push_back(vec);
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147 break;
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148
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149 case CMD_VN:
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150 if(!parse_vec(&vec)) {
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151 continue;
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152 }
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153 obj.vn.push_back(vec);
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154 break;
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155
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156 case CMD_VT:
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157 if(!parse_vec(&vec)) {
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158 continue;
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159 }
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160 vec.y = 1.0 - vec.y;
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161 obj.vt.push_back(Vector2(vec.x, vec.y));
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162 break;
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163
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164 case CMD_O:
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165 case CMD_G:
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166 if(prev_cmd == CMD_O || prev_cmd == CMD_G) {
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167 break; // just in case we've got both of them in a row
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168 }
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169 /* if we have any previous data, group them up, add the object
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170 * and continue with the new one...
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171 */
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172 if(!obj.f.empty()) {
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173 Object *robj = cons_object(&obj);
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174 robj->mtl = matlib[obj.cur_mat];
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175 add_object(robj);
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176 obj_added++;
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177
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178 obj.f.clear(); // clean the face list
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179 }
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180 if((tok = strtok(0, SEP))) {
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181 obj.cur_obj = tok;
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182 } else {
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183 sprintf(cur_name, "default%02d.obj", seq++);
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184 obj.cur_obj = cur_name;
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185 }
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186 break;
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187
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188 case CMD_MTLLIB:
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189 if((tok = strtok(0, SEP))) {
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190 FILE *mfile;
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191 if(!(mfile = fopen(tok, "rb"))) {
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192 fprintf(stderr, "failed to open material library: %s\n", tok);
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193 continue;
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194 }
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195
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196 // load all materials of the mtl file into a vector
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197 vector<ObjMat> vmtl;
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198 if(!read_materials(mfile, &vmtl)) {
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199 continue;
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200 }
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201 fclose(mfile);
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202
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203 // and add them all to the scene
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204 for(size_t i=0; i<vmtl.size(); i++) {
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205 Material mat;
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206 mat.ambient = vmtl[i].ambient;
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207 mat.diffuse = vmtl[i].diffuse;
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208 mat.specular = vmtl[i].specular;
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209 mat.shininess = vmtl[i].shininess;
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210 mat.alpha = vmtl[i].alpha;
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211
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212 /*if(vmtl[i].tex_dif.length()) {
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213 mat.set_texture(get_texture(vmtl[i].tex_dif.c_str()));
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214 }*/
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215
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216 matlib[vmtl[i].name] = mat;
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217 }
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218 }
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219 break;
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220
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221 case CMD_USEMTL:
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222 if((tok = strtok(0, SEP))) {
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223 obj.cur_mat = tok;
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224 } else {
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225 obj.cur_mat = "";
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226 }
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227 break;
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228
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229 case CMD_F:
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230 if(!parse_face(&face)) {
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231 continue;
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232 }
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233
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234 // convert negative indices to regular indices
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235 for(int i=0; i<4; i++) {
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236 if(face.v[i] < 0 && face.v[i] != INVALID_IDX) {
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237 face.v[i] = obj.v.size() + face.v[i];
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238 }
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239 if(face.n[i] < 0 && face.n[i] != INVALID_IDX) {
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240 face.n[i] = obj.vn.size() + face.n[i];
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241 }
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242 if(face.t[i] < 0 && face.t[i] != INVALID_IDX) {
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243 face.t[i] = obj.vt.size() + face.t[i];
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244 }
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245 }
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246
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247 // break quads into triangles if needed
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248 obj.f.push_back(face);
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249 if(face.elem == 4) {
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250 face.v[1] = face.v[2];
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251 face.n[1] = face.n[2];
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252 face.t[1] = face.t[2];
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253
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254 face.v[2] = face.v[3];
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255 face.n[2] = face.n[3];
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256 face.t[2] = face.t[3];
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257
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258 obj.f.push_back(face);
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259 }
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260 break;
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261
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262 default:
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263 break; // ignore unknown commands
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264 }
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265
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266 prev_cmd = cmd;
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267 }
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268
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269 // reached end of file...
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270 if(!obj.f.empty()) {
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271 Object *robj = cons_object(&obj);
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272 robj->mtl = matlib[obj.cur_mat];
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273 add_object(robj);
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274 obj_added++;
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275 }
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276
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277 return obj_added > 0;
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278 }
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279
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280 static Object *cons_object(ObjFile *obj)
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281 {
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282 Object *robj;
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283 Vector3 *varr, *narr;
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284 Vector2 *tarr;
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285
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286 int nelem = obj->f.size() * 3;
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287
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288 assert(sizeof(Vector3) == 3 * sizeof(float));
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289 assert(sizeof(Vector2) == 2 * sizeof(float));
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290
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291 try {
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292 robj = new Object;
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293 varr = new Vector3[nelem];
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294 narr = new Vector3[nelem];
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295 tarr = new Vector2[nelem];
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296 }
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297 catch(...) {
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298 return 0;
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299 }
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300 if(obj->cur_obj.length() > 0) {
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301 robj->set_name(obj->cur_obj.c_str());
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302 }
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303
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304 // need at least one of each element
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305 bool added_norm = false, added_tc = false;
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306 if(obj->vn.empty()) {
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307 obj->vn.push_back(Vector3(0, 0, 0));
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308 added_norm = true;
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309 }
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310 if(obj->vt.empty()) {
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311 obj->vt.push_back(Vector2(0, 0));
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312 added_tc = true;
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313 }
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314
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315 for(size_t i=0; i<obj->f.size(); i++) {
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316 for(int j=0; j<3; j++) {
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317 int idx = i * 3 + j;
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318 ObjFace *f = &obj->f[i];
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319
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320 varr[idx] = obj->v[f->v[j]];
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321 narr[idx] = obj->vn[f->n[j] < 0 ? 0 : f->n[j]];
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322
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323 float t = obj->vt[f->t[j] < 0 ? 0 : f->t[j]].x;
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324 float s = obj->vt[f->t[j] < 0 ? 0 : f->t[j]].y;
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325 tarr[idx] = Vector2(t, s);
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326 }
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327 }
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328
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329 if(added_norm) {
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330 obj->vn.pop_back();
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331 }
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332 if(added_tc) {
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333 obj->vt.pop_back();
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334 }
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335
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336 Mesh *mesh = new Mesh;
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337 mesh->set_attrib(MESH_ATTR_VERTEX, nelem, 3, &varr->x);
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338 mesh->set_attrib(MESH_ATTR_NORMAL, nelem, 3, &narr->x);
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339 mesh->set_attrib(MESH_ATTR_TEXCOORD, nelem, 2, &tarr->x);
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340 robj->set_mesh(mesh);
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341
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342 printf("loaded object %s: %d faces\n", obj->cur_obj.c_str(), nelem / 3);
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343
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344 delete [] varr;
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345 delete [] narr;
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346 delete [] tarr;
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347 return robj;
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348 }
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349
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350 static bool read_materials(FILE *fp, vector<ObjMat> *vmtl)
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351 {
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352 ObjMat mat;
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353
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354 for(;;) {
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355 char line[BUF_SZ];
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356 fgets(line, sizeof line, fp);
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nuclear@3
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357 if(feof(fp)) {
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358 break;
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359 }
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360
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361 char *tok;
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362 if(!(tok = strtok(line, SEP))) {
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363 continue;
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364 }
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365
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366 int cmd;
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367 if((cmd = get_cmd(tok)) == -1) {
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368 continue;
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369 }
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370
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371 switch(cmd) {
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372 case CMD_NEWMTL:
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373 // add the previous material, and start a new one
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374 if(mat.name.length() > 0) {
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375 vmtl->push_back(mat);
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376 mat.reset();
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377 }
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nuclear@3
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378 if((tok = strtok(0, SEP))) {
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379 mat.name = tok;
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380 }
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381 break;
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382
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383 case CMD_KA:
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384 parse_color(&mat.ambient);
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385 break;
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386
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387 case CMD_KD:
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388 parse_color(&mat.diffuse);
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389 break;
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390
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nuclear@3
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391 case CMD_KS:
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392 parse_color(&mat.specular);
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nuclear@3
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393 break;
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nuclear@3
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394
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nuclear@3
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395 case CMD_NS:
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nuclear@3
|
396 if((tok = strtok(0, SEP)) && is_float(tok)) {
|
nuclear@3
|
397 mat.shininess = atof(tok);
|
nuclear@3
|
398 }
|
nuclear@3
|
399 break;
|
nuclear@3
|
400
|
nuclear@3
|
401 case CMD_NI:
|
nuclear@3
|
402 if((tok = strtok(0, SEP)) && is_float(tok)) {
|
nuclear@3
|
403 mat.ior = atof(tok);
|
nuclear@3
|
404 }
|
nuclear@3
|
405 break;
|
nuclear@3
|
406
|
nuclear@3
|
407 case CMD_D:
|
nuclear@3
|
408 case CMD_TR:
|
nuclear@3
|
409 {
|
nuclear@3
|
410 Color c;
|
nuclear@3
|
411 if(parse_color(&c)) {
|
nuclear@3
|
412 mat.alpha = cmd == CMD_D ? c.x : 1.0 - c.x;
|
nuclear@3
|
413 }
|
nuclear@3
|
414 }
|
nuclear@3
|
415 break;
|
nuclear@3
|
416
|
nuclear@3
|
417 case CMD_MAP_KD:
|
nuclear@3
|
418 mat.tex_dif = parse_map();
|
nuclear@3
|
419 break;
|
nuclear@3
|
420
|
nuclear@3
|
421 default:
|
nuclear@3
|
422 break;
|
nuclear@3
|
423 }
|
nuclear@3
|
424 }
|
nuclear@3
|
425
|
nuclear@3
|
426 if(mat.name.length() > 0) {
|
nuclear@3
|
427 vmtl->push_back(mat);
|
nuclear@3
|
428 }
|
nuclear@3
|
429 return true;
|
nuclear@3
|
430 }
|
nuclear@3
|
431
|
nuclear@3
|
432 static int get_cmd(char *str)
|
nuclear@3
|
433 {
|
nuclear@3
|
434 char *s = str;
|
nuclear@3
|
435 while((*s = toupper(*s))) s++;
|
nuclear@3
|
436
|
nuclear@3
|
437 for(int i=0; cmd_names[i]; i++) {
|
nuclear@3
|
438 if(strcmp(str, cmd_names[i]) == 0) {
|
nuclear@3
|
439 return i;
|
nuclear@3
|
440 }
|
nuclear@3
|
441 }
|
nuclear@3
|
442 return CMD_UNK;
|
nuclear@3
|
443 }
|
nuclear@3
|
444
|
nuclear@3
|
445 static bool is_int(const char *str)
|
nuclear@3
|
446 {
|
nuclear@3
|
447 char *tmp;
|
nuclear@3
|
448 strtol(str, &tmp, 10);
|
nuclear@3
|
449 return tmp != str;
|
nuclear@3
|
450 }
|
nuclear@3
|
451
|
nuclear@3
|
452 static bool is_float(const char *str)
|
nuclear@3
|
453 {
|
nuclear@3
|
454 char *tmp;
|
nuclear@3
|
455 strtod(str, &tmp);
|
nuclear@3
|
456 return tmp != str;
|
nuclear@3
|
457 }
|
nuclear@3
|
458
|
nuclear@3
|
459 static bool parse_vec(Vector3 *vec)
|
nuclear@3
|
460 {
|
nuclear@3
|
461 for(int i=0; i<3; i++) {
|
nuclear@3
|
462 char *tok;
|
nuclear@3
|
463
|
nuclear@3
|
464 if(!(tok = strtok(0, SEP)) || !is_float(tok)) {
|
nuclear@3
|
465 if(i < 2) {
|
nuclear@3
|
466 return false;
|
nuclear@3
|
467 }
|
nuclear@3
|
468 vec->z = 0.0;
|
nuclear@3
|
469 } else {
|
nuclear@3
|
470 (*vec)[i] = atof(tok);
|
nuclear@3
|
471 }
|
nuclear@3
|
472 }
|
nuclear@3
|
473 return true;
|
nuclear@3
|
474 }
|
nuclear@3
|
475
|
nuclear@3
|
476 static bool parse_color(Color *col)
|
nuclear@3
|
477 {
|
nuclear@3
|
478 for(int i=0; i<3; i++) {
|
nuclear@3
|
479 char *tok;
|
nuclear@3
|
480
|
nuclear@3
|
481 if(!(tok = strtok(0, SEP)) || !is_float(tok)) {
|
nuclear@3
|
482 col->y = col->z = col->x;
|
nuclear@3
|
483 return i > 0 ? true : false;
|
nuclear@3
|
484 }
|
nuclear@3
|
485 (*col)[i] = atof(tok);
|
nuclear@3
|
486 }
|
nuclear@3
|
487 return true;
|
nuclear@3
|
488 }
|
nuclear@3
|
489
|
nuclear@3
|
490 static bool parse_face(ObjFace *face)
|
nuclear@3
|
491 {
|
nuclear@3
|
492 char *tok[] = {0, 0, 0, 0};
|
nuclear@3
|
493 face->elem = 0;
|
nuclear@3
|
494
|
nuclear@3
|
495 for(int i=0; i<4; i++) {
|
nuclear@3
|
496 if((!(tok[i] = strtok(0, SEP)) || !is_int(tok[i]))) {
|
nuclear@3
|
497 if(i < 3) return false; // less than 3 verts? not a polygon
|
nuclear@3
|
498 } else {
|
nuclear@3
|
499 face->elem++;
|
nuclear@3
|
500 }
|
nuclear@3
|
501 }
|
nuclear@3
|
502
|
nuclear@3
|
503 for(int i=0; i<4; i++) {
|
nuclear@3
|
504 char *subtok = tok[i];
|
nuclear@3
|
505
|
nuclear@3
|
506 if(!subtok || !*subtok || !is_int(subtok)) {
|
nuclear@3
|
507 if(i < 3) {
|
nuclear@3
|
508 return false;
|
nuclear@3
|
509 }
|
nuclear@3
|
510 face->v[i] = INVALID_IDX;
|
nuclear@3
|
511 } else {
|
nuclear@3
|
512 face->v[i] = atoi(subtok);
|
nuclear@3
|
513 if(face->v[i] > 0) face->v[i]--; /* convert to 0-based */
|
nuclear@3
|
514 }
|
nuclear@3
|
515
|
nuclear@3
|
516 while(subtok && *subtok && *subtok != '/') {
|
nuclear@3
|
517 subtok++;
|
nuclear@3
|
518 }
|
nuclear@3
|
519 if(subtok && *subtok && *++subtok && is_int(subtok)) {
|
nuclear@3
|
520 face->t[i] = atoi(subtok);
|
nuclear@3
|
521 if(face->t[i] > 0) face->t[i]--; /* convert to 0-based */
|
nuclear@3
|
522 } else {
|
nuclear@3
|
523 face->t[i] = INVALID_IDX;
|
nuclear@3
|
524 }
|
nuclear@3
|
525
|
nuclear@3
|
526 while(subtok && *subtok && *subtok != '/') {
|
nuclear@3
|
527 subtok++;
|
nuclear@3
|
528 }
|
nuclear@3
|
529 if(subtok && *subtok && *++subtok && is_int(subtok)) {
|
nuclear@3
|
530 face->n[i] = atoi(subtok);
|
nuclear@3
|
531 if(face->n[i] > 0) face->n[i]--; /* convert to 0-based */
|
nuclear@3
|
532 } else {
|
nuclear@3
|
533 face->n[i] = INVALID_IDX;
|
nuclear@3
|
534 }
|
nuclear@3
|
535 }
|
nuclear@3
|
536
|
nuclear@3
|
537 return true;
|
nuclear@3
|
538 }
|
nuclear@3
|
539
|
nuclear@3
|
540 static const char *parse_map()
|
nuclear@3
|
541 {
|
nuclear@3
|
542 char *tok, *prev = 0;
|
nuclear@3
|
543
|
nuclear@3
|
544 while((tok = strtok(0, SEP))) {
|
nuclear@3
|
545 prev = tok;
|
nuclear@3
|
546 }
|
nuclear@3
|
547
|
nuclear@3
|
548 return prev ? prev : "";
|
nuclear@3
|
549 }
|