void ParseLine( const char* line )
{
m_line = line;
SkipSpace();
switch(*(m_line++))
{
case 'f':
if (isspace(*(m_line++)))
{
ParseFace();
}
break;
case 'v':
{
char ch = *(m_line++);
switch (ch)
{
case 'n':
{
ParseVec3(m_normals);
return;
}
case 't':
{
ParseVec2(m_uvs);
return;
}
default:
if (isspace(ch))
{
ParseVec3(m_positions);
}
return;
}
}
}
}
ObjModel::ObjModel(const std::string& filePath)
{
// standardise dir seperators
std::string filePathStd = std::string(filePath);
std::replace(filePathStd.begin(), filePathStd.end(), '\\', '/');
// asd/asd/asd/asd/asd/asd/file.obj
auto tokens = SplitString(filePathStd, '/');
std::string fileName = tokens[tokens.size() - 1];
std::string workingDir = filePathStd.substr(0, filePathStd.size() - fileName.size());
std::ifstream file;
file.open((workingDir + "/" + fileName).c_str());
int curMaterialIndex = 0;
std::string line;
if (file.is_open())
{
while (file.good())
{
getline(file, line);
unsigned int lineLength = line.length();
if (lineLength < 2)
continue;
const char* lineCStr = line.c_str();
switch (lineCStr[0])
{
case 'v': // "v?" => vertex
{
switch (lineCStr[1])
{
case 't': // ? == 't' => vertex texture / uv coords
{
#define TEMP_SSCANF // ~5.5 secs
//#define TEMP_SPLIT // ~10 secs
//#define TEMP_STREAM // ~7.5 secs
#ifdef TEMP_SSCANF
glm::vec2 vt;
sscanf_s(lineCStr, "vt %f %f", &vt.x, &vt.y);
textures.push_back(vt);
#endif // SSCANF
#ifdef TEMP_SPLIT
textures.push_back(ParseVec2(line));
#endif // TEMP_SPLIT
#ifdef TEMP_STREAM
std::istringstream issvt(line.substr(2));
glm::vec2 vt;
issvt >> vt.x;
issvt >> vt.y;
textures.push_back(vt);
#endif // TEMP_STREAM
break;
}
case 'n': // ? == 'n' => vertex normal
{
#ifdef TEMP_SSCANF
glm::vec3 vn;
sscanf_s(lineCStr, "vn %f %f %f", &vn.x, &vn.y, &vn.z);
normals.push_back(vn);
#endif // SSCANF
#ifdef TEMP_SPLIT
normals.push_back(ParseVec3(line));
#endif // TEMP_SPLIT
#ifdef TEMP_STREAM
std::istringstream issvt(line.substr(2));
glm::vec3 vn;
issvt >> vn.x;
issvt >> vn.y;
issvt >> vn.z;
normals.push_back(vn);
#endif // TEMP_STREAM
break;
}
case '\t': // ? == ' ' => vertex
case ' ':
{
#ifdef TEMP_SSCANF
glm::vec3 v;
sscanf_s(lineCStr, "v %f %f %f", &v.x, &v.y, &v.z);
positions.push_back(v);
#endif // SSCANF
#ifdef TEMP_SPLIT
positions.push_back(ParseVec3(line));
#endif // TEMP_SPLIT
#ifdef TEMP_STREAM
std::istringstream issvt(line.substr(2));
glm::vec3 v;
issvt >> v.x;
issvt >> v.y;
issvt >> v.z;
positions.push_back(v);
#endif // TEMP_STREAM
break;
}
}
break;
}
case 'f': // 'f' => face
{
CreateFace(curMaterialIndex, line);
break;
}
case 'm': // 'm' => material template lib
{
if (lineCStr[1] != 't')
break;
char buffer[BUFSIZ];
sscanf_s(lineCStr, "mtllib %s", &buffer);
std::string mtlFileName = std::string(buffer);
//std::string mtlFileName = SplitString(line, ' ')[1];
std::vector<Material*> mats = LoadMaterials(workingDir, mtlFileName);
materials.insert(std::end(materials), std::begin(mats), std::end(mats));
break;
}
case 'u': // 'u' => usemtl
{
if (lineCStr[1] != 's')
break;
std::string mtlName = SplitString(line, ' ')[1];
for (int i = 0; i < materials.size(); i++)
{
if (materials[i]->name == mtlName)
{
curMaterialIndex = i;
break;
}
}
break;
}
};
}
}
else
{
