GLLMtlFile::GLLMtlFile(CFURLRef location)
{
std::string filename = GLLStringFromFileURL(location);
std::ifstream stream(filename.c_str());
if (!stream) throw std::runtime_error("Could not open MTLLib file.");
bool hasFirstMaterial = false;
std::string materialName;
Material *currentMaterial = new Material();
while(stream.good())
{
std::string line;
std::getline(stream, line);
std::istringstream linestream(line);
std::string token;
linestream >> token;
if (token == "newmtl")
{
if (!hasFirstMaterial)
{
// This is the first material. Just save the name.
linestream >> materialName;
hasFirstMaterial = true;
currentMaterial->name = materialName;
}
else
{
// Old material ends here. Store it here; map copies it, so it can be overwritten now.
currentMaterial->ambient[3] = currentMaterial->diffuse[3] = currentMaterial->specular[3] = 1.0f;
materials[materialName] = currentMaterial;
// Reset material
currentMaterial = new Material();
// Save new name
linestream >> materialName;
currentMaterial->name = materialName;
}
}
GLLObjFile::GLLObjFile(CFURLRef location)
{
std::string filename = GLLStringFromFileURL(location);
int fdes = ::open(filename.c_str(), O_RDONLY);
if (fdes < 0) {
throw std::runtime_error("Could not open file");
}
struct stat statistics;
if (fstat(fdes, &statistics) < 0) {
close(fdes);
throw std::runtime_error("Could not get file size");
}
const char *buffer = (const char *) mmap(nullptr, statistics.st_size, PROT_READ, MAP_PRIVATE, fdes, 0);
close(fdes);
const char *current = buffer;
const char *end = &buffer[statistics.st_size];
materialLibraryURLs = CFArrayCreateMutable(kCFAllocatorDefault, 0, &kCFTypeArrayCallBacks);
std::string activeMaterial("");
unsigned activeMaterialStart = 0;
bool hasFirstMaterial = false;
while(current != end)
{
while (current != end && (*current == ' ' || *current == '\n' || *current == '\r')) {
current++;
}
if (current == end)
break;
switch (*current) {
case 'f':
parseFace(current, end);
break;
case 'v':
current += 1;
switch (*current) {
case 'n': // Normals
current += 1;
parseVector(current, end, normals, 3);
break;
case 't': // Tex coords
current += 1;
parseVector(current, end, texCoords, 2);
break;
case 'c': // Colors
current += 1;
parseVector(current, end, colors, 4);
break;
case ' ': // Vertex
parseVector(current, end, vertices, 3);
break;
default:
skipToEndOfLine(current, end);
break;
}
break;
case 'm':
if (followsString(current, end, "mtllib")) {
std::string mtllib = stringToEndOfLine(current, end);
try
{
CFURLRef mtllibLocation = GLLCreateURLFromString(mtllib, location);
CFArrayAppendValue(materialLibraryURLs, mtllibLocation);
CFRelease(mtllibLocation);
}
catch (std::exception &e)
{
std::cerr << "Ignoring mtllib: " << e.what() << std::endl;
}
} else {
skipToEndOfLine(current, end);
}
break;
case 'u':
if (followsString(current, end, "usemtl")) {
if (hasFirstMaterial)
{
// End previous material run
materialRanges.push_back(MaterialRange(activeMaterialStart, (unsigned) originalIndices.size(), activeMaterial));
}
else
hasFirstMaterial = true;
current += 1;
activeMaterial = stringToEndOfLine(current, end);
activeMaterialStart = (unsigned) originalIndices.size();
} else {
skipToEndOfLine(current, end);
}
break;
case '#': // Comment
default:
skipToEndOfLine(current, end);
break;
}
}
munmap((void *) buffer, statistics.st_size);
// Wrap up final material group
materialRanges.push_back(MaterialRange(activeMaterialStart, (unsigned) originalIndices.size(), activeMaterial));
fillIndices();
}
