labyrinth

annotate src/mesh.c @ 8:d3f1f74067b0

find changesets by author, revision, files, or words in the commit message
ops, forgot to swapbuffers on the android side
author John Tsiombikas <nuclear@member.fsf.org>
date Mon, 04 May 2015 04:56:44 +0300
parents 45b91185b298
children
rev   line source
nuclear@3 1 #include <stdlib.h>
nuclear@5 2 #include <assert.h>
nuclear@3 3 #include "opengl.h"
nuclear@0 4 #include "mesh.h"
nuclear@0 5 #include "objfile.h"
nuclear@0 6
nuclear@5 7 static struct vec3 def_verts[] = {
nuclear@5 8 {-1, -1, 1}, {1, -1, 1}, {1, 1, 1}, {-1, -1, 1}, {1, 1, 1}, {-1, 1, 1},
nuclear@5 9 {1, -1, 1}, {1, -1, -1}, {1, 1, -1}, {1, -1, 1}, {1, 1, -1}, {1, 1, 1},
nuclear@5 10 {1, -1, -1}, {-1, -1, -1}, {-1, 1, -1}, {1, -1, -1}, {-1, 1, -1}, {1, 1, -1},
nuclear@5 11 {-1, -1, -1}, {-1, -1, 1}, {-1, 1, 1}, {-1, -1, -1}, {-1, 1, 1}, {-1, 1, -1}
nuclear@5 12 };
nuclear@5 13 #define FACEATTR(x, y, z) {x, y, z}, {x, y, z}, {x, y, z}, {x, y, z}, {x, y, z}, {x, y, z}
nuclear@5 14 static struct vec3 def_norm[] = {
nuclear@5 15 FACEATTR(0, 0, 1),
nuclear@5 16 FACEATTR(1, 0, 0),
nuclear@5 17 FACEATTR(0, 0, -1),
nuclear@5 18 FACEATTR(-1, 0, 0)
nuclear@5 19 };
nuclear@5 20 static struct vec3 def_tc[] = {
nuclear@5 21 {0, 0, 0}, {1, 0, 0}, {1, 1, 0}, {0, 0, 0}, {1, 1, 0}, {0, 1, 0},
nuclear@5 22 {0, 0, 0}, {1, 0, 0}, {1, 1, 0}, {0, 0, 0}, {1, 1, 0}, {0, 1, 0},
nuclear@5 23 {0, 0, 0}, {1, 0, 0}, {1, 1, 0}, {0, 0, 0}, {1, 1, 0}, {0, 1, 0},
nuclear@5 24 {0, 0, 0}, {1, 0, 0}, {1, 1, 0}, {0, 0, 0}, {1, 1, 0}, {0, 1, 0}
nuclear@5 25 };
nuclear@5 26
nuclear@5 27 static struct mesh def_mesh = {
nuclear@5 28 def_verts, def_norm, def_tc,
nuclear@5 29 sizeof def_verts / sizeof *def_verts
nuclear@5 30 };
nuclear@5 31
nuclear@0 32 /* use objfile to load mesh data (vertices, normals, and texcoords)
nuclear@0 33 * from a wavefront|OBJ file.
nuclear@0 34 */
nuclear@0 35 struct mesh *load_mesh(const char *fname)
nuclear@0 36 {
nuclear@0 37 int i;
nuclear@0 38 struct mesh *m;
nuclear@0 39 struct objfile *obj;
nuclear@0 40
nuclear@0 41 if(!(obj = objf_load(fname))) {
nuclear@5 42 return &def_mesh;
nuclear@0 43 }
nuclear@0 44 m = malloc(sizeof *m);
nuclear@0 45 m->num_verts = objf_vertex_count(obj);
nuclear@0 46
nuclear@0 47 m->vert = malloc(m->num_verts * sizeof *m->vert);
nuclear@0 48 m->norm = malloc(m->num_verts * sizeof *m->norm);
nuclear@0 49 m->tc = malloc(m->num_verts * sizeof *m->tc);
nuclear@0 50
nuclear@0 51 for(i=0; i<m->num_verts; i++) {
nuclear@0 52 float *v = objf_vertex(obj, i);
nuclear@0 53 float *n = objf_normal(obj, i);
nuclear@0 54 float *t = objf_texcoord(obj, i);
nuclear@0 55
nuclear@0 56 m->vert[i].x = v[0];
nuclear@0 57 m->vert[i].y = v[1];
nuclear@0 58 m->vert[i].z = v[2];
nuclear@0 59
nuclear@0 60 m->norm[i].x = n[0];
nuclear@0 61 m->norm[i].y = n[1];
nuclear@0 62 m->norm[i].z = n[2];
nuclear@0 63
nuclear@0 64 m->tc[i].x = t[0];
nuclear@0 65 m->tc[i].y = t[1];
nuclear@0 66 }
nuclear@0 67 objf_free(obj);
nuclear@0 68 return m;
nuclear@0 69 }
nuclear@0 70
nuclear@0 71 void free_mesh(struct mesh *m)
nuclear@0 72 {
nuclear@5 73 if(m && m != &def_mesh) {
nuclear@0 74 free(m->vert);
nuclear@0 75 free(m->norm);
nuclear@0 76 free(m->tc);
nuclear@0 77 free(m);
nuclear@0 78 }
nuclear@0 79 }
nuclear@0 80
nuclear@0 81 void render_mesh(struct mesh *m)
nuclear@0 82 {
nuclear@0 83 glEnableClientState(GL_VERTEX_ARRAY);
nuclear@0 84 glEnableClientState(GL_NORMAL_ARRAY);
nuclear@0 85 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
nuclear@0 86
nuclear@0 87 glVertexPointer(3, GL_FLOAT, 0, m->vert);
nuclear@0 88 glNormalPointer(GL_FLOAT, 0, m->norm);
nuclear@0 89 glTexCoordPointer(2, GL_FLOAT, 0, m->tc);
nuclear@0 90
nuclear@0 91 glDrawArrays(GL_TRIANGLES, 0, m->num_verts);
nuclear@0 92
nuclear@0 93 glDisableClientState(GL_VERTEX_ARRAY);
nuclear@0 94 glDisableClientState(GL_NORMAL_ARRAY);
nuclear@0 95 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
nuclear@0 96 }