init on screen center on first startup

src/framework/platform.h

@@ -52,6 +52,9 @@ namespace Platform
     int getWindowHeight();
     bool isWindowMaximized();
 
+    int getDisplayHeight();
+    int getDisplayWidth();
+
     /// Get GL extension function address
     void *getExtensionProcAddress(const char *ext);
     /// Check if GL extension is supported

src/framework/win32platform.cpp

@@ -350,8 +350,6 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
             RECT *rect = (RECT*)lParam;
             win32.x = rect->left;
             win32.y = rect->top;
-            win32.width = rect->right - rect->left;
-            win32.height = rect->bottom - rect->top;
             break;
         }
     case WM_SIZE:
@@ -366,6 +364,8 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
                 break;
             }
 
+            win32.width = LOWORD(lParam);
+            win32.height = HIWORD(lParam);
             g_engine.onResize(LOWORD(lParam), HIWORD(lParam));
             break;
         }

src/framework/x11platform.cpp

@@ -772,6 +772,16 @@ int Platform::getWindowHeight()
     return x11.height;
 }
 
+int Platform::getDisplayWidth()
+{
+    return XDisplayWidth(x11.display, DefaultScreen(x11.display));
+}
+
+int Platform::getDisplayHeight()
+{
+    return XDisplayHeight(x11.display, DefaultScreen(x11.display));
+}
+
 bool Platform::isWindowMaximized()
 {
     bool ret = false;

src/main.cpp

@@ -48,10 +48,16 @@ void signal_handler(int sig)
 /// Default configurations
 void setDefaultConfigs()
 {
-    g_config.setValue("window x", 0);
+    // default size
-    g_config.setValue("window y", 0);
+    int defWidth = 640;
-    g_config.setValue("window width", 640);
+    int defHeight = 480;
-    g_config.setValue("window height", 480);
+
+    // init on screen center
+    g_config.setValue("window x", (Platform::getDisplayWidth() - defWidth)/2);
+    g_config.setValue("window y", (Platform::getDisplayHeight() - defHeight)/2);
+
+    g_config.setValue("window width", defWidth);
+    g_config.setValue("window height", defHeight);
     g_config.setValue("window maximized", false);
 }