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1 #include <stdlib.h>
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2 #include "opengl.h"
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3 #include "mesh.h"
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4 #include "objfile.h"
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5
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6 /* use objfile to load mesh data (vertices, normals, and texcoords)
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7 * from a wavefront|OBJ file.
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8 */
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9 struct mesh *load_mesh(const char *fname)
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10 {
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11 int i;
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12 struct mesh *m;
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13 struct objfile *obj;
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14
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15 if(!(obj = objf_load(fname))) {
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16 return 0;
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17 }
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18 m = malloc(sizeof *m);
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19 m->num_verts = objf_vertex_count(obj);
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20
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21 m->vert = malloc(m->num_verts * sizeof *m->vert);
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22 m->norm = malloc(m->num_verts * sizeof *m->norm);
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23 m->tc = malloc(m->num_verts * sizeof *m->tc);
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24
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25 for(i=0; i<m->num_verts; i++) {
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26 float *v = objf_vertex(obj, i);
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27 float *n = objf_normal(obj, i);
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28 float *t = objf_texcoord(obj, i);
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29
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30 m->vert[i].x = v[0];
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31 m->vert[i].y = v[1];
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32 m->vert[i].z = v[2];
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33
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34 m->norm[i].x = n[0];
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35 m->norm[i].y = n[1];
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36 m->norm[i].z = n[2];
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37
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38 m->tc[i].x = t[0];
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39 m->tc[i].y = t[1];
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40 }
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41 objf_free(obj);
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42 return m;
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43 }
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44
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45 void free_mesh(struct mesh *m)
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46 {
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47 if(m) {
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48 free(m->vert);
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49 free(m->norm);
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50 free(m->tc);
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51 free(m);
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52 }
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53 }
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54
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55 void render_mesh(struct mesh *m)
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56 {
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57 glEnableClientState(GL_VERTEX_ARRAY);
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58 glEnableClientState(GL_NORMAL_ARRAY);
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59 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
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60
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61 glVertexPointer(3, GL_FLOAT, 0, m->vert);
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62 glNormalPointer(GL_FLOAT, 0, m->norm);
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63 glTexCoordPointer(2, GL_FLOAT, 0, m->tc);
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64
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65 glDrawArrays(GL_TRIANGLES, 0, m->num_verts);
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66
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67 glDisableClientState(GL_VERTEX_ARRAY);
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68 glDisableClientState(GL_NORMAL_ARRAY);
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69 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
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70 }
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