1st stage of adding an FPS camera

main.cpp

@@ -8,6 +8,7 @@
 #include <cstdio>
 #include <random>
 #include <SFML/System.hpp>
+#include <SFML/Window.hpp>
 
 NodeRenderer renderer;
 //BlockManager blockManager;
@@ -71,6 +72,9 @@ void display()
     glFlush();
     glutSwapBuffers();
 
+    sf::Vector2i lastMousePos = sf::Vector2i(0, 0);
+    sf::Vector2i mouseDelta = sf::Mouse::getPosition() - lastMousePos;
+    lastMousePos = sf::Mouse::getPosition();
 
     glutPostRedisplay();
 }