HelloWorld.java

import org.lwjgl.Sys;
import org.lwjgl.glfw.*;
import org.lwjgl.opengl.*;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.InetAddress;
import java.net.URL;
import java.nio.ByteBuffer;

import static org.lwjgl.glfw.Callbacks.*;
import static org.lwjgl.glfw.GLFW.*;
import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.system.MemoryUtil.*;

public class HelloWorld {

    private String roomID;

    // We need to strongly reference callback instances.
    private GLFWErrorCallback errorCallback;
    private GLFWKeyCallback   keyCallback;

    // The window handle
    private long window;

    public void run() {
        System.out.println("Hello LWJGL " + Sys.getVersion() + "!");

        try {
            init();
            loop();

            // Release window and window callbacks
            glfwDestroyWindow(window);
            keyCallback.release();
        } finally {
            // Terminate GLFW and release the GLFWerrorfun
            glfwTerminate();
            errorCallback.release();
        }
    }

    private void init() {
        // Setup an error callback. The default implementation
        // will print the error message in System.err.
        glfwSetErrorCallback(errorCallback = errorCallbackPrint(System.err));

        // Initialize GLFW. Most GLFW functions will not work before doing this.
        if ( glfwInit() != GL11.GL_TRUE )
            throw new IllegalStateException("Unable to initialize GLFW");

        // Configure our window
        glfwDefaultWindowHints(); // optional, the current window hints are already the default
        glfwWindowHint(GLFW_VISIBLE, GL_FALSE); // the window will stay hidden after creation
        glfwWindowHint(GLFW_RESIZABLE, GL_TRUE); // the window will be resizable

        int WIDTH = 300;
        int HEIGHT = 300;

        // Create the window
        window = glfwCreateWindow(WIDTH, HEIGHT, "Hello World!", NULL, NULL);
        if ( window == NULL )
            throw new RuntimeException("Failed to create the GLFW window");

        // Setup a key callback. It will be called every time a key is pressed, repeated or released.
        glfwSetKeyCallback(window, keyCallback = new GLFWKeyCallback() {
            @Override
            public void invoke(long window, int key, int scancode, int action, int mods) {
                if ( key == GLFW_KEY_ESCAPE && action == GLFW_RELEASE )
                    glfwSetWindowShouldClose(window, GL_TRUE); // We will detect this in our rendering loop
            }
        });

        // Get the resolution of the primary monitor
        ByteBuffer vidmode = glfwGetVideoMode(glfwGetPrimaryMonitor());
        // Center our window
        glfwSetWindowPos(
                window,
                (GLFWvidmode.width(vidmode) - WIDTH) / 2,
                (GLFWvidmode.height(vidmode) - HEIGHT) / 2
        );

        // Make the OpenGL context current
        glfwMakeContextCurrent(window);
        // Enable v-sync
        glfwSwapInterval(1);

        // Make the window visible
        glfwShowWindow(window);
    }

    private void loop() {
        // This line is critical for LWJGL's interoperation with GLFW's
        // OpenGL context, or any context that is managed externally.
        // LWJGL detects the context that is current in the current thread,
        // creates the ContextCapabilities instance and makes the OpenGL
        // bindings available for use.
        //GL.createCapabilities(); // valid for latest build
        GLContext.createFromCurrent(); // use this line instead with the 3.0.0a build

        // Set the clear color
        glClearColor(1.0f, 0.0f, 0.0f, 0.0f);

        try {
            registerRoom();
        } catch (Exception e){
            e.printStackTrace();
        }

        // Run the rendering loop until the user has attempted to close
        // the window or has pressed the ESCAPE key.
        while ( glfwWindowShouldClose(window) == GL_FALSE ) {
            glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // clear the framebuffer

            glfwSwapBuffers(window); // swap the color buffers

            // Poll for window events. The key callback above will only be
            // invoked during this call.
            glfwPollEvents();
        }
    }

    private void registerRoom() throws Exception {
        String url = "http://spacecharge.co.nf/php/room_add.php";
        URL obj = new URL(url);
        HttpURLConnection con = (HttpURLConnection) obj.openConnection();

        //add reuqest header
        con.setRequestMethod("POST");
        //con.setRequestProperty("User-Agent", USER_AGENT);
        con.setRequestProperty("Accept-Language", "en-US,en;q=0.5");

        InetAddress IP = InetAddress.getLocalHost();

        //System.out.print(IP.getHostAddress());
        String urlParameters = "ipAdd=" + IP.getHostAddress();


        // Send post request
        con.setDoOutput(true);
        DataOutputStream wr = new DataOutputStream(con.getOutputStream());
        wr.writeBytes(urlParameters);
        wr.flush();
        wr.close();

        int responseCode = con.getResponseCode();
        System.out.println("\nSending 'POST' request to URL : " + url);
        System.out.println("Post parameters : " + urlParameters);
        System.out.println("Response Code : " + responseCode);

        BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
        String inputLine;
        StringBuilder response = new StringBuilder();

        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();
        //print result
        System.out.println("Room Code: " + response.toString());
        roomID = response.toString();

        glfwMakeContextCurrent(window);
        //GLContext.createFromCurrent();
        glClearColor(0.0f, 0.0f, 1.0f, 0.0f);
    }

    public static void main(String[] args) {
        new HelloWorld().run();
    }
}