Load OBJ Close #4 (#16)

* .obj loader

* chore: formatter

---------

Co-authored-by: Júlio Pinto <[email protected]>

engine/include/utils.hpp

@@ -25,4 +25,10 @@ typedef struct Point {
 // Function to convert Point to string
 std::vector<Point> parseFile(std::string filename);
 
+// Function to parse OBJ file
+std::vector<Point> parseOBJfile(std::string filename, std::string type);
+
+// Function to parse 3D file
+std::vector<Point> parse3Dfile(std::string filename);
+
 #endif  // UTILS_HPP

engine/src/main.cpp

@@ -117,14 +117,12 @@ void processNormalKeys(unsigned char key, int x, int y) {
       zoom = 1.0f;
       break;
     case 'o':
-      if (zoom > 0.2) {
+      if (zoom > 0.1) {
         zoom -= 0.1;
       }
       break;
     case 'i':
-      if (zoom < 2.5) {
-        zoom += 0.1;
-      }
+      zoom += 0.1;
       break;
     default:
       break;

engine/src/utils.cpp

@@ -7,18 +7,69 @@
 #include <vector>
 
 std::vector<Point> parseFile(std::string filename) {
-  std::vector<Point> points;
   std::ifstream file(filename);
+  std::vector<Point> points;
 
   if (!file.is_open()) {
     std::cerr << "Error: Unable to open file " << filename << std::endl;
     return points;
   }
 
+  printf("filename: %s\n", filename.c_str());
+  if (filename.find(".obj") != std::string::npos) {
+    points = parseOBJfile(filename, "obj");
+  } else if (filename.find(".3d") != std::string::npos) {
+    points = parse3Dfile(filename);
+  } else {
+    std::cerr << "Error: File format not supported" << std::endl;
+  }
+
+  file.close();
+
+  return points;
+}
+
+std::vector<Point> parseOBJfile(std::string filename, std::string type) {
+  std::vector<Point> points;
+  std::vector<Point> sorted_points;
+  std::ifstream file(filename);
+
+  std::string line;
+  while (std::getline(file, line)) {
+    std::istringstream iss(line);
+    std::string type;
+    iss >> type;
+    if (type == "v") {
+      Point point;
+      iss >> point.x >> point.y >> point.z;
+      points.push_back(point);
+    } else if (type == "f") {
+      std::string vertex;
+      std::vector<int> vertex_indices;
+      while (iss >> vertex) {
+        std::string index = vertex.substr(0, vertex.find("/"));
+        vertex_indices.push_back(std::stoi(index) - 1);
+      }
+      for (int i = 0; i < vertex_indices.size(); i++) {
+        sorted_points.push_back(points[vertex_indices[i]]);
+      }
+    }
+  }
+  file.close();
+
+  return sorted_points;
+}
+
+std::vector<Point> parse3Dfile(std::string filename) {
+  std::vector<Point> points;
+  std::ifstream file(filename);
+
   Point point;
   while (file >> point.x >> point.y >> point.z) {
     points.push_back(point);
   }
+
   file.close();
+
   return points;
 }