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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':
122 
				fscanf(file, "%f", &mesh->materials[nummaterials].shininess);
123 
				/* wavefront shininess is from [0, 1000], so scale for OpenGL */
124 
				mesh->materials[nummaterials].shininess /= 1000.0;
125 
				mesh->materials[nummaterials].shininess *= 128.0;
126 
				break;
127 
			case 'K':
128 
				switch(buf[1])
129 
					{
130 
					case 'd':
131 
						fscanf(file, "%f %f %f",
132 
									 &mesh->materials[nummaterials].diffuse[0],
133 
									 &mesh->materials[nummaterials].diffuse[1],
134 
									 &mesh->materials[nummaterials].diffuse[2]);
135 
						break;
136 
					case 's':
137 
						fscanf(file, "%f %f %f",
138 
									 &mesh->materials[nummaterials].specular[0],
139 
									 &mesh->materials[nummaterials].specular[1],
140 
									 &mesh->materials[nummaterials].specular[2]);
141 
						break;
142 
					case 'a':
143 
						fscanf(file, "%f %f %f",
144 
									 &mesh->materials[nummaterials].ambient[0],
145 
									 &mesh->materials[nummaterials].ambient[1],
146 
									 &mesh->materials[nummaterials].ambient[2]);
147 
						break;
148 
					default:
149 
						/* eat up rest of line */
150 
						fgets(buf, sizeof(buf), file);
151 
						break;
152 
					}
153 
				break;
154 
			case 'm': // Map ... all maps are treated equally.
155 
				{
156 
					//fgets(buf, sizeof(buf), file);
157 
					fscanf(file,"%s",buf);
158 
					string texname = pathname + string(buf);
159 
					int tm_idx = mesh->find_texmap(texname);
160 
					if(tm_idx == -1)
161 
						{
162 
							Texmap tm;
163 
							if(tm.load(texname))
164 
								{
165 
									tm_idx = mesh->texmaps.size();
166 
									mesh->texmaps.push_back(tm);
167 
								}
168 
						}
169 
					mesh->materials[nummaterials].tex_id = tm_idx;
170 
				}
171 
				break;
172 
			default:
173 
				/* eat up rest of line */
174 
				fgets(buf, sizeof(buf), file);
175 
				break;
176 
			}
177 
		}
178 
	}
179 
 
180 
 
181 
	void TriMeshObjLoader::load(const std::string& filename)
182 
	{
183 
		pathname = get_path(filename);
184 
		FILE *fp = fopen(filename.data(), "r");
185 
		if (fp==0) {
186 
			cerr << "File " << filename << " does not exist" << endl;
187 
		}
188 
		mesh->materials.resize(1);
189 
 
190 
		char buf[256];
191 
		Vec3f v_geo;
192 
		Vec3f v_normals;
193 
		Vec3f v_texcoords;
194 
 
195 
		Vec3i f_geo;
196 
		Vec3i f_normals;
197 
		Vec3i f_texcoords;
198 
		int current_material=0;
199 
		int v,n,t;
200 
		while(fscanf(fp, "%s", buf) != EOF)
201 
			{
202 
				switch(buf[0])
203 
					{
204 
					case '#': // A comment
205 
						fgets(buf, sizeof(buf), fp);
206 
						break;
207 
					case 'm':
208 
						fgets(buf, sizeof(buf), fp);
209 
						sscanf(buf, "%s %s", buf, buf);
210 
						read_material_library(buf);
211 
						break;
212 
					case 'u':
213 
						fgets(buf, sizeof(buf), fp);
214 
						sscanf(buf, "%s %s", buf, buf);
215 
						current_material = mesh->find_material(buf);
216 
						break;
217 
					case 'v': // v, vn, vt
218 
						switch(buf[1])
219 
							{
220 
							case '\0': // vertex
221 
								fscanf(fp, "%f %f %f", &v_geo[0], &v_geo[1], &v_geo[2]);
222 
								mesh->geometry.add_vertex(v_geo);
223 
								break;
224 
							case 'n': // normal
225 
								fscanf(fp, "%f %f %f", &v_normals[0], &v_normals[1], &v_normals[2]);
226 
								mesh->normals.add_vertex(v_normals);
227 
								break;
228 
							case 't': // texcoord
229 
								fscanf(fp, "%f %f", &v_texcoords[0], &v_texcoords[1]);
230 
								v_texcoords[2]=1;
231 
								mesh->texcoords.add_vertex(v_texcoords);
232 
								break;
233 
							}
234 
						break;
235 
					case 'f':
236 
						v = n = t = 0;
237 
						fscanf(fp, "%s", buf);
238 
						// can be one of %d, %d//%d, %d/%d, %d/%d/%d
239 
						if(sscanf(buf, "%d/%d/%d", &v, &t, &n) == 3)
240 
							{ // v/t/n
241 
 
242 
								f_geo[0]=get_vert(v);
243 
								f_texcoords[0]=get_texcoord(t);
244 
								f_normals[0]=get_normal(n);
245 
 
246 
								fscanf(fp, "%d/%d/%d", &v, &t, &n);
247 
								f_geo[1]=get_vert(v);
248 
								f_texcoords[1]=get_texcoord(t);
249 
								f_normals[1]=get_normal(n);
250 
 
251 
								fscanf(fp, "%d/%d/%d", &v, &t, &n);
252 
								f_geo[2]=get_vert(v);
253 
								f_texcoords[2]=get_texcoord(t);
254 
								f_normals[2]=get_normal(n);
255 
 
256 
								int idx = mesh->geometry.add_face(f_geo);
257 
								mesh->normals.add_face(f_normals, idx);
258 
								mesh->texcoords.add_face(f_texcoords, idx);
259 
								mesh->mat_idx.push_back(current_material);
260 
 
261 
								// Load a general polygon and convert to triangles
262 
								while(fscanf(fp, "%d/%d/%d", &v, &t, &n)==3)
263 
									{
264 
										f_geo[1]=f_geo[2];
265 
										f_normals[1]=f_normals[2];
266 
										f_texcoords[1]=f_texcoords[2];
267 
 
268 
										f_geo[2]=get_vert(v);
269 
										f_normals[2]=get_normal(n);
270 
										f_texcoords[2]=get_texcoord(t);
271 
 
272 
										int idx = mesh->geometry.add_face(f_geo);
273 
										mesh->normals.add_face(f_normals, idx);
274 
										mesh->texcoords.add_face(f_texcoords, idx);
275 
										mesh->mat_idx.push_back(current_material);
276 
									}
277 
							}
278 
						else if (sscanf(buf, "%d//%d", &v, &n)==2)
279 
							{// v//n
280 
								f_geo[0]=get_vert(v);
281 
								f_normals[0]=get_normal(n);
282 
 
283 
								fscanf(fp, "%d//%d", &v, &n);
284 
								f_geo[1]=get_vert(v);
285 
								f_normals[1]=get_normal(n);
286 
 
287 
								fscanf(fp, "%d//%d", &v, &n);
288 
								f_geo[2]=get_vert(v);
289 
								f_normals[2]=get_normal(n);
290 
 
291 
								int idx = mesh->geometry.add_face(f_geo);
292 
								mesh->normals.add_face(f_normals, idx);
293 
								mesh->mat_idx.push_back(current_material);
294 
 
295 
								// Load a general polygon and convert to triangles
296 
								while(fscanf(fp, "%d//%d", &v, &n)==2)
297 
									{
298 
										f_geo[1]=f_geo[2];
299 
										f_normals[1]=f_normals[2];
300 
										f_geo[2]=get_vert(v);
301 
										int idx = mesh->geometry.add_face(f_geo);
302 
										mesh->normals.add_face(f_normals, idx);
303 
										mesh->mat_idx.push_back(current_material);
304 
									}
305 
							}
306 
						else if (sscanf(buf, "%d/%d", &v, &t) == 2)
307 
							{ // v/t
308 
								f_geo[0]=get_vert(v);
309 
								f_texcoords[0]=get_texcoord(t);
310 
 
311 
								fscanf(fp, "%d/%d", &v, &t);
312 
								f_geo[1]=get_vert(v);
313 
								f_texcoords[1]=get_texcoord(t);
314 
 
315 
								fscanf(fp, "%d/%d", &v, &t);
316 
								f_geo[2]=get_vert(v);
317 
								f_texcoords[2]=get_texcoord(t);
318 
 
319 
								int idx = mesh->geometry.add_face(f_geo);
320 
								mesh->texcoords.add_face(f_texcoords, idx);
321 
								mesh->mat_idx.push_back(current_material);
322 
 
323 
								// Load a general polygon and convert to triangles
324 
								while(fscanf(fp, "%d/%d", &v, &t)==2)
325 
									{
326 
										f_geo[1]=f_geo[2];
327 
										f_texcoords[1]=f_texcoords[2];
328 
 
329 
										f_geo[2]=get_vert(v);
330 
										f_texcoords[2]=get_texcoord(t);
331 
 
332 
										int idx = mesh->geometry.add_face(f_geo);
333 
										mesh->texcoords.add_face(f_texcoords, idx);
334 
										mesh->mat_idx.push_back(current_material);
335 
									}
336 
							}
337 
						else if (sscanf(buf, "%d", &v)==1)
338 
							{ // v
339 
								f_geo[0]=get_vert(v);
340 
 
341 
								fscanf(fp, "%d", &v);
342 
								f_geo[1]=get_vert(v);
343 
 
344 
								fscanf(fp, "%d", &v);
345 
								f_geo[2]=get_vert(v);
346 
 
347 
								mesh->geometry.add_face(f_geo);
348 
								mesh->mat_idx.push_back(current_material);
349 
 
350 
								// Load a general polygon and convert to triangles
351 
								while(fscanf(fp, "%d", &v)==1)
352 
									{
353 
										f_geo[1]=f_geo[2];
354 
										f_geo[2]=get_vert(v);
355 
										mesh->geometry.add_face(f_geo);
356 
										mesh->mat_idx.push_back(current_material);
357 
									}
358 
							}
359 
						break;
360 
					default:
361 
						fgets(buf, sizeof(buf), fp);
362 
						break;
363 
					}
364 
			}
365 
	}
366 
 
367 
 
368 
	void obj_load(const string& filename, TriMesh &mesh)
369 
	{
370 
		TriMeshObjLoader loader(&mesh);
371 
		loader.load(filename);
372 
	}
373 
 
374 
}