Keep window position and size in config

src/main.cpp

@@ -1,6 +1,8 @@
 #include <SDL.h>
 #include <SDL_vulkan.h>
 #include <iostream>
+#include <fstream>
+#include <sstream>
 
 #include <assimp/Importer.hpp>
 #include <assimp/scene.h>
@@ -27,8 +29,70 @@ uint32_t platform::getTime() {
     return SDL_GetTicks();
 }
 
+int windowX = SDL_WINDOWPOS_CENTERED;
+int windowY = SDL_WINDOWPOS_CENTERED;
+int windowWidth = 640;
+int windowHeight = 480;
+
+int toInt(const std::string &str) {
+    std::stringstream ss(str);
+
+    int num;
+    if((ss >> num).fail())
+        return -1;
+    else
+        return num;
+}
+
+void readConfig() {
+    std::ifstream file("config.txt");
+
+    std::string line;
+    while(std::getline(file, line)) {
+        if(line.find('=') != std::string::npos) {
+            std::string key, value;
+            key = line.substr(0, line.find('='));
+            value = line.substr(line.find('=') + 1, line.length());
+
+            if(key == "x") {
+                windowX = toInt(value);
+            } else if(key == "y") {
+                windowY = toInt(value);
+            } else if(key == "width") {
+                windowWidth = toInt(value);
+            } else if(key == "height") {
+                windowHeight = toInt(value);
+            }
+        }
+    }
+}
+
+void writeConfig() {
+    std::ofstream file("config.txt");
+
+    int x, y;
+    SDL_GetWindowPosition(window, &x, &y);
+
+    file << "x=" << x << "\n";
+    file << "y=" << y << "\n";
+
+    int w, h;
+    SDL_GetWindowSize(window, &w, &h);
+
+    file << "width=" << w << "\n";
+    file << "height=" << h << "\n";
+}
+
 int main(int, char*[]) {
-    window = SDL_CreateWindow("Graph", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, SDL_WINDOW_VULKAN | SDL_WINDOW_RESIZABLE);
+    readConfig();
+
+    window = SDL_CreateWindow("Graph",
+                              windowX,
+                              windowY,
+                              windowWidth,
+                              windowHeight,
+                              SDL_WINDOW_VULKAN |
+                              SDL_WINDOW_RESIZABLE);
     if(!window)
         return -1;
 
@@ -88,6 +152,8 @@ int main(int, char*[]) {
 
     delete renderer;
 
+    writeConfig();
+
     SDL_DestroyWindow(window);
 
     return 0;