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|
#include <GL/glut.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* vector */
typedef float vec3_t[3];
typedef float vec4_t[4];
/* vertex */
typedef struct
{
vec4_t xyzw;
} obj_vertex_t;
/* texture coordinates */
typedef struct
{
vec3_t uvw;
} obj_texCoord_t;
/* normal vector */
typedef struct
{
vec3_t ijk;
} obj_normal_t;
/* polygon */
typedef struct
{
GLenum type; /* primitive type */
int num_elems; /* number of vertices */
int *vert_indices; /* vertex indices */
int *uvw_indices; /* texture coordinate indices */
int *norm_indices; /* normal vector indices */
} obj_face_t;
/* obj model structure */
typedef struct
{
int num_verts; /* number of vertices */
int num_texCoords; /* number of texture coords. */
int num_normals; /* number of normal vectors */
int num_faces; /* number of polygons */
int has_texCoords; /* has texture coordinates? */
int has_normals; /* has normal vectors? */
obj_vertex_t *vertices; /* vertex list */
obj_texCoord_t *texCoords; /* tex. coord. list */
obj_normal_t *normals; /* normal vector list */
obj_face_t *faces; /* model's polygons */
} obj_model_t;
obj_model_t *objfile;
void
FreeModel (obj_model_t *mdl)
{
int i;
if (mdl)
{
if (mdl->vertices)
{
free (mdl->vertices);
mdl->vertices = NULL;
}
if (mdl->texCoords)
{
free (mdl->texCoords);
mdl->texCoords = NULL;
}
if (mdl->normals)
{
free (mdl->normals);
mdl->normals = NULL;
}
if (mdl->faces)
{
for (i = 0; i < mdl->num_faces; ++i)
{
if (mdl->faces[i].vert_indices)
free (mdl->faces[i].vert_indices);
if (mdl->faces[i].uvw_indices)
free (mdl->faces[i].uvw_indices);
if (mdl->faces[i].norm_indices)
free (mdl->faces[i].norm_indices);
}
free (mdl->faces);
mdl->faces = NULL;
}
}
}
int
MallocModel (obj_model_t *mdl)
{
if (mdl->num_verts)
{
mdl->vertices = (obj_vertex_t *)
malloc (sizeof (obj_vertex_t) * mdl->num_verts);
if (!mdl->vertices)
return 0;
}
if (mdl->num_texCoords)
{
mdl->texCoords = (obj_texCoord_t *)
malloc (sizeof (obj_texCoord_t) * mdl->num_texCoords);
if (!mdl->texCoords)
return 0;
}
if (mdl->num_normals)
{
mdl->normals = (obj_normal_t *)
malloc (sizeof (obj_normal_t) * mdl->num_normals);
if (!mdl->normals)
return 0;
}
if (mdl->num_faces)
{
mdl->faces = (obj_face_t *)
malloc (sizeof (obj_face_t) * mdl->num_faces);
if (!mdl->faces)
return 0;
}
return 1;
}
int
FirstPass (FILE *fp, obj_model_t *mdl)
{
int v, t, n;
char buf[256];
while (!feof (fp))
{
/* read whole line */
fgets (buf, sizeof (buf), fp);
switch (buf[0])
{
case 'v':
{
if (buf[1] == ' ')
{
/* vertex */
mdl->num_verts++;
}
else if (buf[1] == 't')
{
/* texture coords. */
mdl->num_texCoords++;
}
else if (buf[1] == 'n')
{
/* normal vector */
mdl->num_normals++;
}
else
{
printf ("warning: unknown token \"%s\"! (ignoring)\n", buf);
}
break;
}
case 'f':
{
/* face */
if (sscanf (buf + 2, "%d/%d/%d", &v, &n, &t) == 3)
{
mdl->num_faces++;
mdl->has_texCoords = 1;
mdl->has_normals = 1;
}
else if (sscanf (buf + 2, "%d//%d", &v, &n) == 2)
{
mdl->num_faces++;
mdl->has_texCoords = 0;
mdl->has_normals = 1;
}
else if (sscanf (buf + 2, "%d/%d", &v, &t) == 2)
{
mdl->num_faces++;
mdl->has_texCoords = 1;
mdl->has_normals = 0;
}
else if (sscanf (buf + 2, "%d", &v) == 1)
{
mdl->num_faces++;
mdl->has_texCoords = 0;
mdl->has_normals = 0;
}
else
{
/* shloud never be there or the model is very crappy */
fprintf (stderr, "error: found face with no vertex!\n");
}
break;
}
case 'g':
{
/* group */
/* fscanf (fp, "%s", buf); */
break;
}
default:
break;
}
}
/* check if informations are valid */
if ((mdl->has_texCoords && !mdl->num_texCoords) ||
(mdl->has_normals && !mdl->num_normals))
{
fprintf (stderr, "error: contradiction between collected info!\n");
return 0;
}
if (!mdl->num_verts)
{
fprintf (stderr, "error: no vertex found!\n");
return 0;
}
#if 1
printf ("first pass results: found\n");
printf (" * %i vertices\n", mdl->num_verts);
printf (" * %i texture coords.\n", mdl->num_texCoords);
printf (" * %i normal vectors\n", mdl->num_normals);
printf (" * %i faces\n", mdl->num_faces);
printf (" * has texture coords.: %s\n", mdl->has_texCoords ? "yes" : "no");
printf (" * has normals: %s\n", mdl->has_normals ? "yes" : "no");
#endif
return 1;
}
int
SecondPass (FILE *fp, obj_model_t *mdl)
{
obj_vertex_t *pvert = mdl->vertices;
obj_texCoord_t *puvw = mdl->texCoords;
obj_normal_t *pnorm = mdl->normals;
obj_face_t *pface = mdl->faces;
char buf[128], *pbuf;
int i;
while (!feof (fp))
{
/* read whole line */
fgets (buf, sizeof (buf), fp);
switch (buf[0])
{
case 'v':
{
if (buf[1] == ' ')
{
/* vertex */
if (sscanf (buf + 2, "%f %f %f %f",
&pvert->xyzw[0], &pvert->xyzw[1],
&pvert->xyzw[2], &pvert->xyzw[3]) != 4)
{
if (sscanf (buf + 2, "%f %f %f", &pvert->xyzw[0],
&pvert->xyzw[1], &pvert->xyzw[2] ) != 3)
{
fprintf (stderr, "error reading vertex data!\n");
return 0;
}
else
{
pvert->xyzw[3] = 1.0;
}
}
pvert++;
}
else if (buf[1] == 't')
{
/* texture coords. */
if (sscanf (buf + 2, "%f %f %f", &puvw->uvw[0],
&puvw->uvw[1], &puvw->uvw[2]) != 3)
{
if (sscanf (buf + 2, "%f %f", &puvw->uvw[0],
&puvw->uvw[1]) != 2)
{
if (sscanf (buf + 2, "%f", &puvw->uvw[0]) != 1)
{
fprintf (stderr, "error reading texture coordinates!\n");
return 0;
}
else
{
puvw->uvw[1] = 0.0;
puvw->uvw[2] = 0.0;
}
}
else
{
puvw->uvw[2] = 0.0;
}
}
puvw++;
}
else if (buf[1] == 'n')
{
/* normal vector */
if (sscanf (buf + 2, "%f %f %f", &pnorm->ijk[0],
&pnorm->ijk[1], &pnorm->ijk[2]) != 3)
{
fprintf (stderr, "error reading normal vectors!\n");
return 0;
}
pnorm++;
}
break;
}
case 'f':
{
pbuf = buf;
pface->num_elems = 0;
/* count number of vertices for this face */
while (*pbuf)
{
if (*pbuf == ' ')
pface->num_elems++;
pbuf++;
}
/* select primitive type */
if (pface->num_elems < 3)
{
fprintf (stderr, "error: a face must have at least 3 vertices!\n");
return 0;
}
else if (pface->num_elems == 3)
{
pface->type = GL_TRIANGLES;
}
else if (pface->num_elems == 4)
{
pface->type = GL_QUADS;
}
else
{
pface->type = GL_POLYGON;
}
/* memory allocation for vertices */
pface->vert_indices = (int *)malloc (sizeof (int) * pface->num_elems);
if (mdl->has_texCoords)
pface->uvw_indices = (int *)malloc (sizeof (int) * pface->num_elems);
if (mdl->has_normals)
pface->norm_indices = (int *)malloc (sizeof (int) * pface->num_elems);
/* read face data */
pbuf = buf;
i = 0;
for (i = 0; i < pface->num_elems; ++i)
{
pbuf = strchr (pbuf, ' ');
pbuf++; /* skip space */
/* try reading vertices */
if (sscanf (pbuf, "%d/%d/%d",
&pface->vert_indices[i],
&pface->uvw_indices[i],
&pface->norm_indices[i]) != 3)
{
if (sscanf (pbuf, "%d//%d", &pface->vert_indices[i],
&pface->norm_indices[i]) != 2)
{
if (sscanf (pbuf, "%d/%d", &pface->vert_indices[i],
&pface->uvw_indices[i]) != 2)
{
sscanf (pbuf, "%d", &pface->vert_indices[i]);
}
}
}
/* indices must start at 0 */
pface->vert_indices[i]--;
if (mdl->has_texCoords)
pface->uvw_indices[i]--;
if (mdl->has_normals)
pface->norm_indices[i]--;
}
pface++;
break;
}
}
}
#if 1
printf ("second pass results: read\n");
printf (" * %i vertices\n", pvert - mdl->vertices);
printf (" * %i texture coords.\n", puvw - mdl->texCoords);
printf (" * %i normal vectors\n", pnorm - mdl->normals);
printf("La on passe");
printf (" * %i faces\n", pface - mdl->faces);
#endif
printf("ici ca ne passe pas");
return 1;
}
int
ReadOBJModel (const char *filename, obj_model_t *mdl)
{
FILE *fp;
fp = fopen (filename, "r");
if (!fp)
{
fprintf (stderr, "error: couldn't open \"%s\"!", filename);
return 0;
}
/* reset model data */
memset (mdl, 0, sizeof (obj_model_t));
/* first pass: read model info */
if (!FirstPass (fp, mdl))
{
fclose (fp);
return 0;
}
rewind (fp);
/* memory allocation */
if (!MallocModel (mdl))
{
fclose (fp);
FreeModel (mdl);
return 0;
}
/* second pass: read model data */
if (!SecondPass (fp, mdl))
{
fclose (fp);
FreeModel (mdl);
return 0;
}
fclose (fp);
return 1;
}
void
RenderOBJModel (obj_model_t *mdl)
{
int i, j;
for (i = 0; i < mdl->num_faces; ++i)
{
glBegin (mdl->faces[i].type);
for (j = 0; j < mdl->faces[i].num_elems; ++j)
{
if (mdl->has_texCoords)
glTexCoord3fv (mdl->texCoords[mdl->faces[i].uvw_indices[j]].uvw);
if (mdl->has_normals)
glNormal3fv (mdl->normals[mdl->faces[i].norm_indices[j]].ijk);
glVertex4fv (mdl->vertices [mdl->faces[i].vert_indices[j]].xyzw);
}
glEnd();
}
}
void
init (const char *filename)
{
/* init OpenGL */
glClearColor (0.5f, 0.5f, 0.5f, 1.0f);
glShadeModel (GL_SMOOTH);
glEnable (GL_DEPTH_TEST);
glEnable (GL_LIGHTING);
glEnable (GL_LIGHT0);
/* init OpenGL light */
GLfloat lightpos[] = { 5.0f, 10.0f, 0.0f, 1.0f };
glLightfv (GL_LIGHT0, GL_POSITION, lightpos);
/* load model file */
objfile = (obj_model_t *)malloc (sizeof (obj_model_t));
if ( !ReadOBJModel (filename, objfile))
{
exit (-1);
}
}
void
shutdownApp (void)
{
/* free memory */
if (objfile)
{
FreeModel (objfile);
free (objfile);
objfile = NULL;
}
}
void
reshape (int w, int h)
{
if (h == 0)
h = 1;
glViewport (0, 0, (GLsizei)w, (GLsizei)h);
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
gluPerspective (45.0, (GLfloat)w/(GLfloat)h, 0.1, 1000.0);
glMatrixMode (GL_MODELVIEW);
glLoadIdentity ();
glutPostRedisplay ();
}
void
display (void)
{
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity ();
glTranslatef (0.0f, 0.0f, -15.0f);
/* draw model */
RenderOBJModel (objfile);
glutSwapBuffers ();
}
void
keyboard (unsigned char key, int x, int y)
{
switch (key)
{
case 27: /* escape */
exit(0);
break;
}
}
#include <stdio.h>
int
main (int argc, char *argv[])
{
if (argc < 2)
{
fprintf (stderr, "usage: %s filename.obj\n", argv[0]);
return -1;
}
glutInit (&argc, argv);
glutInitDisplayMode (GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH);
glutInitWindowSize (640, 480);
glutCreateWindow ("OBJ Model");
atexit (shutdownApp);
init (argv[1]);
glutReshapeFunc (reshape);
glutDisplayFunc (display);
glutKeyboardFunc (keyboard);
glutMainLoop ();
return 0;
} |
Probleme lors d'un chargement d'objets
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