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79 jab 1 
// bdl, jab, feb 2005
2 
// Inspired and partly lifted from Nate Robins' Obj loader
3 
 
4 
#include "TriMesh.h"
5 
#include <CGLA/Vec3f.h>
6 
#include <stdio.h>
7 
#include <iostream>
8 
 
9 
using namespace std;
10 
using namespace CGLA;
11 
 
12 
namespace Geometry {
13 
 
14 
	namespace
15 
	{
16 
		string get_path(const string& _filename)
17 
		{
18 
			// Make sure we only have slashes and not backslashes
19 
			string filename = _filename;
20 
			replace(filename.begin(),filename.end(),'\\','/');
21 
 
22 
			// Find the last occurrence of slash.
23 
			// Everything before is path.
24 
			unsigned int n = filename.rfind("/");
25 
			if(n > filename.size())
26 
				return "./";
27 
			string pathname = "";
28 
			pathname.assign(filename,0,n);
29 
			pathname.append("/");
30 
			return pathname;
31 
		}
32 
	}
33 
	class TriMeshObjLoader
34 
	{
35 
		TriMesh *mesh;
36 
		std::string pathname;
37 
 
38 
		int get_vert(int i) {
39 
			assert(i!=0);
40 
			if (i<0) {
41 
				return mesh->geometry.no_vertices()+i;
42 
			} else
43 
				return i-1;
44 
		}
45 
 
46 
		int get_normal(int i) {
47 
			if (i<0) {
48 
				return mesh->normals.no_vertices()+i;
49 
			} else
50 
				return i-1;
51 
		}
52 
 
53 
		int get_texcoord(int i) {
54 
			if (i<0) {
55 
				return mesh->texcoords.no_vertices()+i;
56 
			} else
57 
				return i-1;
58 
		}
59 
 
60 
		void read_material_library(const string& filename);
61 
 
62 
	public:
63 
 
64 
		TriMeshObjLoader(TriMesh *_mesh): mesh(_mesh) {}
65 
 
66 
		void load(const std::string& filename);
67 
	};
68 
 
69 
	void TriMeshObjLoader::read_material_library(const string& filename)
70 
	{
71 
		string fn = pathname + filename;
72 
		FILE* file = fopen(fn.data(), "r");
73 
		if (!file)
74 
			{
75 
				cerr << "Could not open " << filename << endl;
76 
				return;
77 
			}
78 
 
79 
		char  buf[128];
80 
		unsigned int nummaterials=1;
81 
 
82 
		// count the number of materials in the file
83 
		while(fscanf(file, "%s", buf) != EOF)
84 
			{
85 
				switch(buf[0])
86 
					{
87 
					case '#':				/* comment */
88 
						/* eat up rest of line */
89 
						fgets(buf, sizeof(buf), file);
90 
						break;
91 
					case 'n':				/* newmtl */
92 
						fgets(buf, sizeof(buf), file);
93 
						nummaterials++;
94 
						sscanf(buf, "%s %s", buf, buf);
95 
						break;
96 
					default:
97 
						/* eat up rest of line */
98 
						fgets(buf, sizeof(buf), file);
99 
						break;
100 
					}
101 
			}
102 
		rewind(file);
103 
 
104 
		/* allocate memory for the materials */
105 
		mesh->materials.resize(nummaterials);
106 
 
107 
		/* now, read in the data */
108 
		nummaterials = 0;
109 
		while(fscanf(file, "%s", buf) != EOF) {
110 
			switch(buf[0]) {
111 
			case '#':				/* comment */
112 
				/* eat up rest of line */
113 
				fgets(buf, sizeof(buf), file);
114 
				break;
115 
			case 'n':				/* newmtl */
116 
				fgets(buf, sizeof(buf), file);
117 
				sscanf(buf, "%s %s", buf, buf);
118 
				nummaterials++;
119 
				mesh->materials[nummaterials].name = buf;
120 
				break;
121 
			case 'N':
421 jrf 122 
        switch(buf[1])
123 
          {
124 
          case 's':
125 
				    fscanf(file, "%f", &mesh->materials[nummaterials].shininess);
126 
				    /* wavefront shininess is from [0, 1000], so scale for OpenGL */
127 
				    mesh->materials[nummaterials].shininess /= 1000.0;
128 
				    mesh->materials[nummaterials].shininess *= 128.0;
129 
            break;
130 
          case 'i':
131 
				    fscanf(file, "%f", &mesh->materials[nummaterials].ior_in);
132 
            break;
133 
					default:
134 
						/* eat up rest of line */
135 
						fgets(buf, sizeof(buf), file);
136 
						break;
137 
          }
79 jab 138 
				break;
139 
			case 'K':
140 
				switch(buf[1])
141 
					{
142 
					case 'd':
143 
						fscanf(file, "%f %f %f",
144 
									 &mesh->materials[nummaterials].diffuse[0],
145 
									 &mesh->materials[nummaterials].diffuse[1],
146 
									 &mesh->materials[nummaterials].diffuse[2]);
147 
						break;
148 
					case 's':
149 
						fscanf(file, "%f %f %f",
150 
									 &mesh->materials[nummaterials].specular[0],
151 
									 &mesh->materials[nummaterials].specular[1],
152 
									 &mesh->materials[nummaterials].specular[2]);
153 
						break;
154 
					case 'a':
155 
						fscanf(file, "%f %f %f",
156 
									 &mesh->materials[nummaterials].ambient[0],
157 
									 &mesh->materials[nummaterials].ambient[1],
158 
									 &mesh->materials[nummaterials].ambient[2]);
159 
						break;
160 
					default:
161 
						/* eat up rest of line */
162 
						fgets(buf, sizeof(buf), file);
163 
						break;
164 
					}
165 
				break;
421 jrf 166 
      case 'T':
167 
				fscanf(file, "%f %f %f",
168 
               &mesh->materials[nummaterials].transmission[0],
169 
               &mesh->materials[nummaterials].transmission[1],
170 
               &mesh->materials[nummaterials].transmission[2]);
171 
        break;
172 
      case 'i':
173 
				fscanf(file, "%d", &mesh->materials[nummaterials].illum);
174 
        break;
79 jab 175 
			case 'm': // Map ... all maps are treated equally.
176 
				{
177 
					fscanf(file,"%s",buf);
178 bj 178 
					mesh->materials[nummaterials].tex_path = pathname;
179 
					mesh->materials[nummaterials].tex_name = string(buf);
79 jab 180 
				}
181 
				break;
182 
			default:
183 
				/* eat up rest of line */
184 
				fgets(buf, sizeof(buf), file);
185 
				break;
186 
			}
187 
		}
188 
	}
189 
 
190 
 
191 
	void TriMeshObjLoader::load(const std::string& filename)
192 
	{
193 
		pathname = get_path(filename);
194 
		FILE *fp = fopen(filename.data(), "r");
195 
		if (fp==0) {
196 
			cerr << "File " << filename << " does not exist" << endl;
364 jrf 197 
      exit(0);
79 jab 198 
		}
199 
		mesh->materials.resize(1);
200 
 
201 
		char buf[256];
202 
		Vec3f v_geo;
203 
		Vec3f v_normals;
204 
		Vec3f v_texcoords;
205 
 
206 
		Vec3i f_geo;
207 
		Vec3i f_normals;
208 
		Vec3i f_texcoords;
209 
		int current_material=0;
210 
		int v,n,t;
211 
		while(fscanf(fp, "%s", buf) != EOF)
212 
			{
213 
				switch(buf[0])
214 
					{
215 
					case '#': // A comment
216 
						fgets(buf, sizeof(buf), fp);
217 
						break;
218 
					case 'm':
219 
						fgets(buf, sizeof(buf), fp);
220 
						sscanf(buf, "%s %s", buf, buf);
221 
						read_material_library(buf);
222 
						break;
223 
					case 'u':
224 
						fgets(buf, sizeof(buf), fp);
225 
						sscanf(buf, "%s %s", buf, buf);
226 
						current_material = mesh->find_material(buf);
227 
						break;
228 
					case 'v': // v, vn, vt
229 
						switch(buf[1])
230 
							{
231 
							case '\0': // vertex
232 
								fscanf(fp, "%f %f %f", &v_geo[0], &v_geo[1], &v_geo[2]);
233 
								mesh->geometry.add_vertex(v_geo);
234 
								break;
235 
							case 'n': // normal
236 
								fscanf(fp, "%f %f %f", &v_normals[0], &v_normals[1], &v_normals[2]);
237 
								mesh->normals.add_vertex(v_normals);
238 
								break;
239 
							case 't': // texcoord
240 
								fscanf(fp, "%f %f", &v_texcoords[0], &v_texcoords[1]);
241 
								v_texcoords[2]=1;
242 
								mesh->texcoords.add_vertex(v_texcoords);
243 
								break;
244 
							}
245 
						break;
246 
					case 'f':
247 
						v = n = t = 0;
248 
						fscanf(fp, "%s", buf);
249 
						// can be one of %d, %d//%d, %d/%d, %d/%d/%d
250 
						if(sscanf(buf, "%d/%d/%d", &v, &t, &n) == 3)
251 
							{ // v/t/n
252 
 
253 
								f_geo[0]=get_vert(v);
254 
								f_texcoords[0]=get_texcoord(t);
255 
								f_normals[0]=get_normal(n);
256 
 
257 
								fscanf(fp, "%d/%d/%d", &v, &t, &n);
258 
								f_geo[1]=get_vert(v);
259 
								f_texcoords[1]=get_texcoord(t);
260 
								f_normals[1]=get_normal(n);
261 
 
262 
								fscanf(fp, "%d/%d/%d", &v, &t, &n);
263 
								f_geo[2]=get_vert(v);
264 
								f_texcoords[2]=get_texcoord(t);
265 
								f_normals[2]=get_normal(n);
266 
 
267 
								int idx = mesh->geometry.add_face(f_geo);
268 
								mesh->normals.add_face(f_normals, idx);
269 
								mesh->texcoords.add_face(f_texcoords, idx);
270 
								mesh->mat_idx.push_back(current_material);
271 
 
272 
								// Load a general polygon and convert to triangles
273 
								while(fscanf(fp, "%d/%d/%d", &v, &t, &n)==3)
274 
									{
275 
										f_geo[1]=f_geo[2];
276 
										f_normals[1]=f_normals[2];
277 
										f_texcoords[1]=f_texcoords[2];
278 
 
279 
										f_geo[2]=get_vert(v);
280 
										f_normals[2]=get_normal(n);
281 
										f_texcoords[2]=get_texcoord(t);
282 
 
283 
										int idx = mesh->geometry.add_face(f_geo);
284 
										mesh->normals.add_face(f_normals, idx);
285 
										mesh->texcoords.add_face(f_texcoords, idx);
286 
										mesh->mat_idx.push_back(current_material);
287 
									}
288 
							}
289 
						else if (sscanf(buf, "%d//%d", &v, &n)==2)
290 
							{// v//n
291 
								f_geo[0]=get_vert(v);
292 
								f_normals[0]=get_normal(n);
293 
 
294 
								fscanf(fp, "%d//%d", &v, &n);
295 
								f_geo[1]=get_vert(v);
296 
								f_normals[1]=get_normal(n);
297 
 
298 
								fscanf(fp, "%d//%d", &v, &n);
299 
								f_geo[2]=get_vert(v);
300 
								f_normals[2]=get_normal(n);
301 
 
302 
								int idx = mesh->geometry.add_face(f_geo);
303 
								mesh->normals.add_face(f_normals, idx);
304 
								mesh->mat_idx.push_back(current_material);
305 
 
306 
								// Load a general polygon and convert to triangles
307 
								while(fscanf(fp, "%d//%d", &v, &n)==2)
308 
									{
309 
										f_geo[1]=f_geo[2];
310 
										f_normals[1]=f_normals[2];
311 
										f_geo[2]=get_vert(v);
312 
										int idx = mesh->geometry.add_face(f_geo);
313 
										mesh->normals.add_face(f_normals, idx);
314 
										mesh->mat_idx.push_back(current_material);
315 
									}
316 
							}
317 
						else if (sscanf(buf, "%d/%d", &v, &t) == 2)
318 
							{ // v/t
319 
								f_geo[0]=get_vert(v);
320 
								f_texcoords[0]=get_texcoord(t);
321 
 
322 
								fscanf(fp, "%d/%d", &v, &t);
323 
								f_geo[1]=get_vert(v);
324 
								f_texcoords[1]=get_texcoord(t);
325 
 
326 
								fscanf(fp, "%d/%d", &v, &t);
327 
								f_geo[2]=get_vert(v);
328 
								f_texcoords[2]=get_texcoord(t);
329 
 
330 
								int idx = mesh->geometry.add_face(f_geo);
331 
								mesh->texcoords.add_face(f_texcoords, idx);
332 
								mesh->mat_idx.push_back(current_material);
333 
 
334 
								// Load a general polygon and convert to triangles
335 
								while(fscanf(fp, "%d/%d", &v, &t)==2)
336 
									{
337 
										f_geo[1]=f_geo[2];
338 
										f_texcoords[1]=f_texcoords[2];
339 
 
340 
										f_geo[2]=get_vert(v);
341 
										f_texcoords[2]=get_texcoord(t);
342 
 
343 
										int idx = mesh->geometry.add_face(f_geo);
344 
										mesh->texcoords.add_face(f_texcoords, idx);
345 
										mesh->mat_idx.push_back(current_material);
346 
									}
347 
							}
348 
						else if (sscanf(buf, "%d", &v)==1)
349 
							{ // v
350 
								f_geo[0]=get_vert(v);
351 
 
352 
								fscanf(fp, "%d", &v);
353 
								f_geo[1]=get_vert(v);
354 
 
355 
								fscanf(fp, "%d", &v);
356 
								f_geo[2]=get_vert(v);
357 
 
358 
								mesh->geometry.add_face(f_geo);
359 
								mesh->mat_idx.push_back(current_material);
360 
 
361 
								// Load a general polygon and convert to triangles
362 
								while(fscanf(fp, "%d", &v)==1)
363 
									{
364 
										f_geo[1]=f_geo[2];
365 
										f_geo[2]=get_vert(v);
366 
										mesh->geometry.add_face(f_geo);
367 
										mesh->mat_idx.push_back(current_material);
368 
									}
369 
							}
370 
						break;
371 
					default:
372 
						fgets(buf, sizeof(buf), fp);
373 
						break;
374 
					}
375 
			}
376 
	}
377 
 
378 
 
379 
	void obj_load(const string& filename, TriMesh &mesh)
380 
	{
381 
		TriMeshObjLoader loader(&mesh);
382 
		loader.load(filename);
383 
	}
384 
 
385 
}