/*! All indices are converted to C-style (from 0). Missing entries are assigned -1. */
Vertex ObjReader::getInt3(const char*& token)
{
Vertex v(-1);
v.v = fix_v(atoi(token));
token += strcspn(token, "/ \t\r");
if (token[0] != '/') return(v);
token++;
// it is i//n
if (token[0] == '/') {
token++;
v.vn = fix_vn(atoi(token));
token += strcspn(token, " \t\r");
return(v);
}
// it is i/t/n or i/t
v.vt = fix_vt(atoi(token));
token += strcspn(token, "/ \t\r");
if (token[0] != '/') return(v);
token++;
// it is i/t/n
v.vn = fix_vn(atoi(token));
token += strcspn(token, " \t\r");
return(v);
}
OBJLoader::OBJLoader(const FileName &fileName, const bool subdivMode)
: path(fileName.path()), group(new SceneGraph::GroupNode), subdivMode(subdivMode)
{
/* open file */
std::ifstream cin;
cin.open(fileName.c_str());
if (!cin.is_open()) {
THROW_RUNTIME_ERROR("cannot open " + fileName.str());
return;
}
/* generate default material */
Material objmtl; new (&objmtl) OBJMaterial;
Ref<SceneGraph::MaterialNode> defaultMaterial = new SceneGraph::MaterialNode(objmtl);
curMaterial = defaultMaterial;
char line[10000];
memset(line, 0, sizeof(line));
while (cin.peek() != -1)
{
/* load next multiline */
char* pline = line;
while (true) {
cin.getline(pline, sizeof(line) - (pline - line) - 16, '\n');
ssize_t last = strlen(pline) - 1;
if (last < 0 || pline[last] != '\\') break;
pline += last;
*pline++ = ' ';
}
const char* token = trimEnd(line + strspn(line, " \t"));
if (token[0] == 0) continue;
/*! parse position */
if (token[0] == 'v' && isSep(token[1])) {
v.push_back(getVec3f(token += 2)); continue;
}
/* parse normal */
if (token[0] == 'v' && token[1] == 'n' && isSep(token[2])) {
vn.push_back(getVec3f(token += 3));
continue;
}
/* parse texcoord */
if (token[0] == 'v' && token[1] == 't' && isSep(token[2])) { vt.push_back(getVec2f(token += 3)); continue; }
/*! parse face */
if (token[0] == 'f' && isSep(token[1]))
{
parseSep(token += 1);
std::vector<Vertex> face;
while (token[0]) {
Vertex vtx = getInt3(token);
face.push_back(vtx);
parseSepOpt(token);
}
curGroup.push_back(face);
continue;
}
/*! parse edge crease */
if (token[0] == 'e' && token[1] == 'c' && isSep(token[2]))
{
parseSep(token += 2);
float w = getFloat(token);
parseSepOpt(token);
int a = fix_v(getInt(token));
parseSepOpt(token);
int b = fix_v(getInt(token));
parseSepOpt(token);
ec.push_back(Crease(w, a, b));
continue;
}
/*! use material */
if (!strncmp(token, "usemtl", 6) && isSep(token[6]))
{
flushFaceGroup();
std::string name(parseSep(token += 6));
if (material.find(name) == material.end()) curMaterial = defaultMaterial;
else curMaterial = material[name];
continue;
}
/* load material library */
if (!strncmp(token, "mtllib", 6) && isSep(token[6])) {
loadMTL(path + std::string(parseSep(token += 6)));
continue;
}
// ignore unknown stuff
}
flushFaceGroup();
cin.close();
}