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#include "loader.h"
#include "../core/exception.h"
#include <algorithm>
#include <fstream>
#include <regex>
#include <sstream>
namespace yage
{
const std::vector<std::regex> ele_regs({"^(\\d+)$", "^(\\d+)\\/(\\d+)$",
"^(\\d+)\\/\\/(\\d+)$",
"^(\\d+)\\/(\\d+)\\/(\\d+)$"});
void load_obj(std::string filename, std::vector<glm::vec4> &vertices,
std::vector<glm::vec3> &normals, std::vector<GLushort> &elements)
{
std::ifstream in(filename, std::ios::in);
if (!in.is_open()) {
throw FileLoadException("Could not load obj file '" + filename + "'");
}
std::string line;
while (getline(in, line)) {
if (line.substr(0, 2) == "v ") {
std::istringstream s(line.substr(2));
glm::vec4 v;
s >> v.x >> v.y >> v.z;
v.w = 1.f;
vertices.push_back(v);
} else if (line.substr(0, 2) == "f ") {
std::istringstream s(line.substr(2));
GLushort a, b, c;
s >> a >> b >> c;
a--, b--, c--;
elements.push_back(a);
elements.push_back(b);
elements.push_back(c);
} else if (line.substr(0, 2) == "vn ") {
std::for_each(ele_regs.begin(), ele_regs.end(), [](std::regex re) {
});
std::istringstream s(line.substr(2));
glm::vec3 v;
s >> v.x >> v.y >> v.z;
normals.push_back(v);
} else {
// do nothing otherwise
}
}
in.close();
}
} // namespace yage
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