ported the University CGI demo from WINDOWS + GLUT + GLEW + GLU + OpenGL 4 to LINUX WAYLAND + EGL + GLES 2 with minimal cuts

GL_STUFF/SOURCES/SCENE/InstancesLoader.cpp

@@ -0,0 +1,85 @@
+#include <regex>
+#include <iostream>
+#include <sstream>
+#include "../../HEADERS/SCENE/InstancesLoader.h"
+
+char lineHeader[128];
+char* res;
+FILE* file;
+
+std::smatch pieces;
+
+Instance3D* parseInstanceData(Model3D* model, string str) {
+    vector<float> vecComponents = vector<float>();
+    std::regex regex("-?\\d+.\\d+");
+    std::regex_search(str, pieces, regex);
+    float x = stof(pieces[0], NULL); //potevi evitare la regex
+    str = pieces.suffix().str();
+    std::regex_search(str, pieces, regex);
+    float y = stof(pieces[0], NULL); //potevi evitare la regex
+    str = pieces.suffix().str();
+    std::regex_search(str, pieces, regex);
+    float z = stof(pieces[0], NULL); //potevi evitare la regex
+    str = pieces.suffix().str();
+    std::regex_search(str, pieces, regex);
+    float rotx = stof(pieces[0], NULL); //potevi evitare la regex
+    str = pieces.suffix().str();
+    std::regex_search(str, pieces, regex);
+    float roty = stof(pieces[0], NULL); //potevi evitare la regex
+    str = pieces.suffix().str();
+    std::regex_search(str, pieces, regex);
+    float rotz = stof(pieces[0], NULL); //potevi evitare la regex
+    Instance3D* inst = new Instance3D(model, vec3(x, y, z), vec3(1));
+    inst->rotate(vec3(1, 0, 0), rotx);
+    inst->rotate(vec3(0, 1, 0), roty);
+    inst->rotate(vec3(0, 0, 1), rotz);
+    return inst;
+}
+
+
+/* TOFIX: broken */
+bool loadInstances(std::string path, vector<Instance3D*>& instances, bool smoothNormals) {
+    bool modelLoaded = false;
+    std::stringstream fileName;
+    Model3D* currentModel = NULL;
+    /*on windows was last of \\ */
+    string root = path.substr(0, path.find_last_of("/") + 1);
+    file = fopen(&path[0], "r");
+    if (file == NULL) {
+        printf("Impossible to open the scene file ! Are you in the right path ?\n");
+        getchar();
+        return false;
+    }
+    while (1) {
+        res = fgets(lineHeader, 128, file); // read the first word of the line
+        // EOF = End Of File. Store pending curve and quit the loop.
+        if (res == NULL) {
+            break;
+        }
+        string str = lineHeader;
+        std::regex regex("\\w+\\n");
+        //inizia una serie di istanze(la prima o una nuova)
+        if (std::regex_match(str, pieces, regex)) {
+            std::regex regex("\\w+");
+            std::regex_search(str, pieces, regex);
+            fileName.str(std::string()); //clear
+            fileName << root << pieces[0].str() << ".obj";
+            string mdl = fileName.str();
+            currentModel = new Model3D(&mdl[0], smoothNormals);
+            modelLoaded = true;
+        }
+        //devono essere i dati di trasformazione di un istanza
+        else {
+            std::regex regex("\\s*(-?\\d+.\\d+)(( , -?\\d+.\\d+)+)\\s*(\\n)?");
+            //sono dati di un vertice
+            if (std::regex_match(str, pieces, regex) && modelLoaded) {
+                instances.push_back(parseInstanceData(currentModel, str));
+            }
+            else {
+                std::cout << "unrecognized scene line : " << str << std::endl;
+            }
+        }
+    }
+    std::cout << "trovati " << instances.size() << std::endl;
+    return true;
+}