For centering GLFW window

GLFWWindowCentering.cpp

void centering(GLFWwindow* window) {

	// Get screen resolution
	const GLFWvidmode * mode = glfwGetVideoMode(glfwGetPrimaryMonitor());
	int screen_width = mode->width, screen_height = mode->height;

	int halfx = screen_width / 2, halfy = screen_height / 2;
	int hw = WIN_SIZE_X / 2, hh = WIN_SIZE_Y / 2;
	int posx = halfx - hw, posy = halfy - hh;

	glfwSetWindowPos(window, posx, posy);
}