feat: xml parsing (#11)

.gitignore

@@ -8,4 +8,5 @@ engine/CMakeFiles/*
 .idea/*
 .vscode/*
 generator/generator
-engine/engine
+engine/engine
+build

engine/include/Camera.hpp

@@ -0,0 +1,25 @@
+#ifndef CAMERA_HPP
+#define CAMERA_HPP
+
+#include <string>
+
+#include "Camera.hpp"
+#include "utils.hpp"
+
+class Camera {
+ public:
+  Point position;
+  Point lookAt;
+  Point up;
+  int fov;
+  float near;
+  float far;
+
+  Camera();
+  Camera(Point position, Point lookAt, Point up, int fov, float near,
+         float far);
+
+  std::string toString();
+};
+
+#endif  // CAMERA_HPP

engine/include/Configuration.hpp

@@ -0,0 +1,22 @@
+#ifndef CONFIGURATION_HPP
+#define CONFIGURATION_HPP
+
+#include <string>
+#include <vector>
+
+#include "Camera.hpp"
+#include "Configuration.hpp"
+#include "Window.hpp"
+
+class Configuration {
+ public:
+  Window window;
+  Camera camera;
+  std::vector<std::string> models;
+  Configuration() = default;
+  Configuration(Window window, Camera camera, std::vector<std::string> models);
+
+  std::string toString();
+};
+
+#endif  // CONFIGURATION_HPP

engine/include/Window.hpp

@@ -0,0 +1,19 @@
+#ifndef WINDOW_HPP
+#define WINDOW_HPP
+
+#include <string>
+
+#include "Window.hpp"
+
+class Window {
+ public:
+  float width;
+  float height;
+
+  Window();
+  Window(float width, float height);
+
+  std::string toString();
+};
+
+#endif  // WINDOW_HPP

engine/include/parse.hpp

@@ -0,0 +1,12 @@
+#ifndef PARSE_HPP
+#define PARSE_HPP
+
+#include <string>
+
+#include "../../lib/rapidxml-1.13/rapidxml.hpp"
+#include "Configuration.hpp"
+#include "parse.hpp"
+
+Configuration parseConfig(std::string filename);
+
+#endif  // PARSE_HPP

engine/include/utils.hpp

@@ -18,6 +18,12 @@ typedef struct Point {
   // Constructor
   Point(float x_val = 0.0f, float y_val = 0.0f, float z_val = 0.0f)
       : x(x_val), y(y_val), z(z_val) {}
+
+  std::string toString() {
+    std::stringstream ss;
+    ss << "Point(" << x << ", " << y << ", " << z << ")";
+    return ss.str();
+  }
 } Point;
 
 // Function to convert Point to string

engine/src/Camera.cpp

@@ -0,0 +1,34 @@
+#include "Camera.hpp"
+
+#include <sstream>
+#include <string>
+
+Camera::Camera() {
+  this->position = Point();
+  this->lookAt = Point();
+  this->up = Point();
+  this->fov = 0;
+  this->near = 0;
+  this->far = 0;
+}
+
+Camera::Camera(Point position, Point lookAt, Point up, int fov, float near,
+               float far) {
+  this->position = position;
+  this->lookAt = lookAt;
+  this->up = up;
+  this->fov = fov;
+  this->near = near;
+  this->far = far;
+}
+
+std::string Camera::toString() {
+  std::stringstream ss;
+  ss << "\tPosition: " << position.toString() << std::endl
+     << "\tLookAt: " << lookAt.toString() << std::endl
+     << "\tUp: " << up.toString() << std::endl
+     << "\tFOV: " << std::to_string(fov).c_str() << std::endl
+     << "\tNear: " << std::to_string(near).c_str() << std::endl
+     << "\tFar: " << std::to_string(far).c_str() << std::endl;
+  return ss.str();
+}

engine/src/Configuration.cpp

@@ -0,0 +1,29 @@
+#include "Configuration.hpp"
+
+#include <sstream>
+#include <string>
+
+Configuration::Configuration(Window window, Camera camera,
+                             std::vector<std::string> models) {
+  this->window = window;
+  this->camera = camera;
+  this->models = models;
+}
+
+std::string vectorToString(std::vector<std::string> v) {
+  std::stringstream ss;
+  for (auto i : v) {
+    ss << i << " ";
+  }
+  return ss.str();
+}
+
+std::string Configuration::toString() {
+  std::stringstream ss;
+  ss << "Window:\n"
+     << window.toString() << std::endl
+     << "Camera:\n"
+     << camera.toString() << std::endl
+     << "Models: " << vectorToString(models) << std::endl;
+  return ss.str();
+}

engine/src/Window.cpp

@@ -0,0 +1,21 @@
+#include "Window.hpp"
+
+#include <sstream>
+#include <string>
+
+Window::Window() {
+  this->width = 0;
+  this->height = 0;
+}
+
+Window::Window(float width, float height) {
+  this->width = width;
+  this->height = height;
+}
+
+std::string Window::toString() {
+  std::stringstream ss;
+  ss << "\tWidth: " << width << std::endl
+     << "\tHeight: " << height << std::endl;
+  return ss.str();
+}

engine/src/main.cpp

@@ -8,23 +8,25 @@
 #include <math.h>
 
 #include "draw.hpp"
+#include "parse.hpp"
 
 float cameraAngle = 90.0f;
 float cameraAngleY = 0.0f;
-char* file = "";
+
+Configuration c;
 
 void changeSize(int w, int h) {
   // Prevent a divide by zero, when window is too short
   // (you can�t make a window with zero width).
   if (h == 0) h = 1;
 
-  float ratio = w * 1.0f / h;
+  float ratio = c.window.width * 1.0f / c.window.height;
   // Set the projection matrix as current
   glMatrixMode(GL_PROJECTION);
   // Load the identity matrix
   glLoadIdentity();
   // Set the viewport to be the entire window
-  glViewport(0, 0, w, h);
+  glViewport(0, 0, c.window.width, c.window.height);
   // Set the perspective
   gluPerspective(45.0f, ratio, 1.0f, 1000.0f);
   // return to the model view matrix mode
@@ -34,12 +36,12 @@ void changeSize(int w, int h) {
 void renderScene(void) {
   // clear buffers
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-
   // set camera
   glLoadIdentity();
   // gluLookAt(0.0f, 0.0f, 5.0f, 0.0f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f);
-  gluLookAt(5.0 * sin(cameraAngle), 5.0 * cos(cameraAngleY),
-            5.0 * cos(cameraAngle), 0.0, 0.0, 0.0, 0.0f, 1.0f, 0.0f);
+  gluLookAt(c.camera.position.x, c.camera.position.y, c.camera.position.z,
+            c.camera.lookAt.x, c.camera.lookAt.y, c.camera.lookAt.z,
+            c.camera.up.x, c.camera.up.y, c.camera.up.z);
 
   // put drawing instructions here
   glBegin(GL_LINES);
@@ -58,7 +60,9 @@ void renderScene(void) {
   glEnd();
 
   glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
-  drawFile(file);
+  for (std::string model : c.models) {
+    drawFile(model.data());
+  }
 
   // End of frame
   glutSwapBuffers();
@@ -94,16 +98,18 @@ void processSpecialKeys(int key, int xx, int yy) {
 }
 
 int main(int argc, char** argv) {
+  std::string filename;
+  filename.assign(argv[1]);
+  c = parseConfig(filename);
+
   // put GLUT�s init here
   glutInit(&argc, argv);
   glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);
   glutInitWindowPosition(100, 100);
-  glutInitWindowSize(800, 800);
+  glutInitWindowSize(c.window.width, c.window.height);
   glutCreateWindow("CG@DI");
 
   // put callback registry here
-  file = argv[1];
-  glutReshapeFunc(changeSize);
   glutIdleFunc(renderScene);
   glutDisplayFunc(renderScene);
   glutReshapeFunc(reshape);

engine/src/parse.cpp

@@ -0,0 +1,70 @@
+#include "parse.hpp"
+
+#include <fstream>
+#include <iostream>
+#include <string>
+
+Configuration parseConfig(std::string filename) {
+  // open file in read mode
+  std::ifstream file(filename);
+
+  // check if the file was opened successfully
+  if (!file.is_open()) {
+    std::cerr << "Error opening the file!" << std::endl;
+    exit(1);
+  }
+
+  // read the XML file content into a string
+  std::string xmlContent((std::istreambuf_iterator<char>(file)),
+                         std::istreambuf_iterator<char>());
+  file.close();
+
+  // parse the XML string using RapidXML
+  rapidxml::xml_document<> doc;
+  doc.parse<0>(&xmlContent[0]);
+
+  // access the root node
+  rapidxml::xml_node<>* root = doc.first_node("world");
+
+  // window information
+  char* width = root->first_node("window")->first_attribute("width")->value();
+  char* height = root->first_node("window")->first_attribute("height")->value();
+
+  Window window_info = Window(std::stof(width), std::stof(height));
+
+  // camera information
+  rapidxml::xml_node<>* camera = root->first_node("camera");
+
+  rapidxml::xml_node<>* position_n = camera->first_node("position");
+  Point position = Point(std::stof(position_n->first_attribute("x")->value()),
+                         std::stof(position_n->first_attribute("y")->value()),
+                         std::stof(position_n->first_attribute("z")->value()));
+
+  rapidxml::xml_node<>* lookAt_n = camera->first_node("lookAt");
+  Point lookAt = Point(std::stof(lookAt_n->first_attribute("x")->value()),
+                       std::stof(lookAt_n->first_attribute("y")->value()),
+                       std::stof(lookAt_n->first_attribute("z")->value()));
+
+  rapidxml::xml_node<>* up_n = camera->first_node("up");
+  Point up = Point(std::stof(up_n->first_attribute("x")->value()),
+                   std::stof(up_n->first_attribute("y")->value()),
+                   std::stof(up_n->first_attribute("z")->value()));
+
+  rapidxml::xml_node<>* projection = camera->first_node("projection");
+  int fov = std::stoi(projection->first_attribute("fov")->value());
+  float near = std::stof(projection->first_attribute("near")->value());
+  float far = std::stof(projection->first_attribute("far")->value());
+
+  Camera camera_info = Camera(position, lookAt, up, fov, near, far);
+
+  // models
+  std::vector<std::string> models_info;
+  rapidxml::xml_node<>* models =
+      root->first_node("group")->first_node("models");
+  for (rapidxml::xml_node<>* model = models->first_node("model"); model;
+       model = model->next_sibling("model")) {
+    models_info.push_back(std::string(model->first_attribute("file")->value()));
+  }
+
+  return Configuration(window_info, camera_info, models_info);
+}

engine/test.xml

@@ -0,0 +1,15 @@
+<world> 
+    <window width="512" height="512" /> <!-- gluPerspective Ratio -->
+    <camera> 
+        <position x="5" y="5" z="5" /> <!-- gluLookAt eye -->
+        <lookAt x="0" y="0" z="0" /> <!-- gluLookAt center-->
+        <up x="0" y="1" z="0" /> <!-- gluLookAt up-->
+        <projection fov="60" near="1" far="1000" /> <!--gluPerspective-->
+    </camera>
+    <group> 
+          <models> 
+            <model file="cone.3d" />
+            <model file="sphere.3d" /> <!-- generator cone 1 2 4 3 cone.3d -->
+         </models>
+     </group>
+</world>