LWJGL: glfwCreateWindow return null

问题

I was trying LWJGL library in Java seeing the tutorial, but the creation of the window I will return null.

This is the code:

import static org.lwjgl.glfw.GLFW.*;
import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.system.MemoryUtil.*;
import java.nio.ByteBuffer;
import org.lwjgl.glfw.GLFWvidmode;

public class Main implements Runnable {
    private int height = 720, width = height / 9 * 16;
    private String title = "Game";

    private Thread thread;
    private boolean running = false;

    private long window;

    public void start() {
        running = true;
        thread = new Thread(this, title);
        thread.start();
    }

    private void init() {
        if(glfwInit() != GL_TRUE) {
            System.err.println("Non riesco ad inizializzare GLFW!");
            return;
        }

        glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
        glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
        glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
        glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
        glfwWindowHint(GLFW_RESIZABLE, GL_TRUE);
        window = glfwCreateWindow(width, height, title, NULL, NULL);

        if(window == NULL) {
            System.err.println("Non riesco a creare una finestra GLFW!");
            return;
        }

        ByteBuffer vidmode = glfwGetVideoMode(glfwGetPrimaryMonitor());
        glfwSetWindowPos(window, (GLFWvidmode.width(vidmode) - width) / 2, (GLFWvidmode.height(vidmode) - height) / 2);

        glfwMakeContextCurrent(window);
        glfwShowWindow(window);
    }

    @Override
    public void run() {
        init();
        while(running) {
            update();
            render();

            if(glfwWindowShouldClose(window) == GL_TRUE)
                running = false;
        }
    }

    private void update() {
        glfwPollEvents();
    }

    private void render() {
        glfwSwapBuffers(window);
    }

    public static void main(String[] args) {
        new Main().start();
    }
}

Returns the following error:

Non riesco a creare una finestra GLFW!
Exception in thread "Game" java.lang.NullPointerException
    at org.lwjgl.system.Checks.checkPointer(Checks.java:66)
    at org.lwjgl.glfw.GLFW.glfwSwapBuffers(GLFW.java:2546)
    at com.michele.flappybird.Main.render(Main.java:66)
    at com.michele.flappybird.Main.run(Main.java:54)
    at java.lang.Thread.run(Unknown Source)

How can I fix? Thanks to anyone trying to help me.

回答1:

My first attempt would be to simplify the program by removing the Thread, since LWJGL sometime has problems calling methods from outside the main thread. The second attempt would be to remove the glfwWindowHint(...) methods and instead call glfwDefaultWindowHints()

来源：https://stackoverflow.com/questions/28929736/lwjgl-glfwcreatewindow-return-null

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lwjgl