void parse_scene_file(char *filename, Camera *cam)
{
char c, obj_filename[64];
int w, h;
FILE *fp;
float sx, sy, sz, rx, ry, rz, dx, dy, dz; // scale factors, rotation angles (degrees), translation factors
Transform Tmat, Rmat, Smat, scratchmat, Mmat;
Vect P;
Light *L;
Surface *S;
Sphere *Sph;
// read file
fp = fopen(filename, "r");
// camera position
fscanf(fp, "camera %lf %lf %lf %lf %lf %lf %lf %lf %lf\n",
&cam->eye[X], &cam->eye[Y], &cam->eye[Z],
&cam->center[X], &cam->center[Y], &cam->center[Z],
&cam->up[X], &cam->up[Y], &cam->up[Z]);
setup_lookat_transform(cam->W2C, cam->eye, cam->center, cam->up);
// clip planes
fscanf(fp, "clip %lf %lf %lf %lf %lf %lf\n",
&cam->clip[LEFT], &cam->clip[RIGHT],
&cam->clip[BOTTOM], &cam->clip[TOP],
&cam->clip[NEAR], &cam->clip[FAR]);
// image dimensions
fscanf(fp, "image %i %i\n", &w, &h);
cam->im = make_image(w, h);
// objects and lights
model_list.clear();
model_surf_list.clear();
sphere_list.clear();
light_list.clear();
while (1) {
c = fgetc(fp);
// end of file
if (c == EOF)
return;
// it's a comment
if (c == '#') {
do { c = fgetc(fp); printf("eating %c\n", c); }
while (c != '\n' && c != EOF);
if (c == EOF)
return;
printf("done\n");
}
// it's an object
else if (c == 'o') {
S = (Surface *) malloc(sizeof(Surface));
fscanf(fp, "bj %s %f %f %f %f %f %f %f %f %f %lf %lf %lf %lf %lf %lf %lf %lf %lf %lf %lf %lf %lf\n",
obj_filename,
&dx, &dy, &dz,
&sx, &sy, &sz,
&rx, &ry, &rz,
&(S->amb[R]), &(S->amb[G]), &(S->amb[B]),
&(S->diff[R]), &(S->diff[G]), &(S->diff[B]),
&S->spec[R], &S->spec[G], &S->spec[B],
&S->spec_exp, &S->ior,
&S->reflectivity, &S->transparency);
GLMmodel *model = glmReadOBJ(obj_filename);
if (!model) {
printf("no such glm model %s\n", obj_filename);
exit(1);
}
// scale and center model on origin
glmUnitize(model);
// build model transformations (including lookat world -> camera transform)
TransformIdentity(Tmat);
MATRC(Tmat, 0, 3) = dx;
MATRC(Tmat, 1, 3) = dy;
MATRC(Tmat, 2, 3) = dz;
TransformIdentity(Smat);
MATRC(Smat, 0, 0) = sx;
MATRC(Smat, 1, 1) = sy;
MATRC(Smat, 2, 2) = sz;
model->position[0] = dx;
model->position[1] = dy;
model->position[2] = dz;
// ROTATION WOULD GO HERE
TransformProd(Tmat, Smat, scratchmat);
TransformProd(cam->W2C, scratchmat, Mmat);
//TransformPrint(Mmat);
// apply transform to model
glm_transform(Mmat, model);
// calculate normals
glmFacetNormals(model);
glmVertexNormals(model, 90.0);
model->index = model_list.size();
model_list.push_back(model);
model_surf_list.push_back(S);
}
// it's a sphere
else if (c == 's') {
S = (Surface *) malloc(sizeof(Surface));
Sph = (Sphere *) malloc(sizeof(Sphere));
fscanf(fp, "phere %f %f %f %f %lf %lf %lf %lf %lf %lf %lf %lf %lf %lf %lf %lf %lf\n",
&dx, &dy, &dz, // position
&sx, // size
&(S->amb[R]), &(S->amb[G]), &(S->amb[B]),
&(S->diff[R]), &(S->diff[G]), &(S->diff[B]),
&S->spec[R], &S->spec[G], &S->spec[B],
&S->spec_exp, &S->ior,
&S->reflectivity, &S->transparency);
Sph->P[X] = dx;
Sph->P[Y] = dy;
Sph->P[Z] = dz;
Sph->radius = sx;
Sph->surf = S;
sphere_list.push_back(Sph);
}
// it's a light
else if (c == 'l') {
L = (Light *) malloc(sizeof(Light));
fscanf(fp, "ight %lf %lf %lf %lf %lf %lf %lf %lf %lf %lf %lf %lf\n",
&P[X], &P[Y], &P[Z],
&L->amb[R], &L->amb[G], &L->amb[B],
&L->diff[R], &L->diff[G], &L->diff[B],
&L->spec[R], &L->spec[G], &L->spec[B]);
// move to camera coordinates
P[W] = 0;
TransformVect(cam->W2C, P, L->P);
// add to list
light_list.push_back(L);
}
// unknown
else if (c == '\n' && c != ' ' && c != '\t') {
printf("bad scene syntax %c\n", c);
exit(1);
}
}
}
//-------------------------------------------------
// Transforms
//
//
//-------------------------------------------------
void TransformInitialise(STransform* const pTransform, unsigned int depth)
{
MatrixStackInitialise(&pTransform->m_transformStack, depth);
TransformIdentity(pTransform);
}
