LWJGL3: Input delay

[Nijco]

Hey,
to start with lwjgl i render a simple square on the screen witch should be moved by WASD. This is working fine but when i stop pressing the key the square stops moving immediately and then moves again for a second or something (depends on how long i pressed the key) and stops moving after that again. This delay is generated by my extended GLFWKeyCallback class, when I print the action variable of the invoke methode i get somethink like this:

2
2
2
2
0 <-- this is the point I stopped pressing the key
1
2 <-- but it behaves as if the key would still be pressed
2
2
2
2
2
0 <-- until it realizes again that i stopped pressing the button

I don't know if this is a bug or just a fault by me but it is quite annoying.

This is the simple input class I am using like you find it in every tutorial:

package input;

import static org.lwjgl.glfw.GLFW.*;
import org.lwjgl.glfw.GLFWKeyCallback;

public class Input extends GLFWKeyCallback {
	private static boolean[] keys = new boolean[600];

	@Override
	public void invoke(long window, int key, int scancode, int action, int mods) {
		keys[key] = action != GLFW_RELEASE;
		System.out.println(action);
	}

	public static boolean isKeyDown(int key) {
		return keys[key];
	}
}

[spasi]

I cannot reproduce this. The sequence I see is 1, 2, 2, ..., 0.

Could you share some details about your system? (OS/arch, LWJGL version, JVM version) Could you prepare a minimal standalone program that reproduces the issue for you?

[Nijco]

OS: Linux Mint 18
Java Version: 1.8.0_91
LWJGL Version: 3.0.0 build 90
OpenGL Version: 4.5.0 NVIDIA 361.42

This is waht's happen if I run the source below code: https://youtu.be/g2hXiK_44Es

package delay;
import org.lwjgl.*;
import org.lwjgl.glfw.*;
import org.lwjgl.opengl.*;

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 Main {
	private Input input;
	private long window;

	public void run() {

		try {
			init();
			loop();

			glfwFreeCallbacks(window);
			glfwDestroyWindow(window);
		} finally {
			glfwTerminate();
			glfwSetErrorCallback(null).free();
		}
	}

	private void init() {
		GLFWErrorCallback.createPrint(System.err).set();

		if ( !glfwInit() )
			throw new IllegalStateException("Unable to initialize GLFW");

		glfwDefaultWindowHints(); 
		glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE);
		glfwWindowHint(GLFW_RESIZABLE, GLFW_TRUE); 

		int WIDTH = 1280;
		int HEIGHT = 720;

		window = glfwCreateWindow(WIDTH, HEIGHT, "Input delay!", NULL, NULL);
		if ( window == NULL )
			throw new RuntimeException("Failed to create the GLFW window");

		glfwSetKeyCallback(window,input = new Input());

		GLFWVidMode vidmode = glfwGetVideoMode(glfwGetPrimaryMonitor());
		glfwSetWindowPos(
			window,
			(vidmode.width() - WIDTH) / 2,
			(vidmode.height() - HEIGHT) / 2
		);

		glfwMakeContextCurrent(window);
		glfwSwapInterval(1);

		glfwShowWindow(window);
	}

	private void loop() {
		GL.createCapabilities();
		System.out.println("Java Version: " + System.getProperty("java.version"));
		System.out.println("LWJGL Version: " + Version.getVersion());
		System.out.println("OpenGL Version: " +glGetString(GL_VERSION));

		glClearColor(0.0f, 0.0f, 0.0f, 0.0f);

		while ( !glfwWindowShouldClose(window) ) {
			glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

			if(input.isKeyDown(GLFW_KEY_SPACE)){
				glClearColor(1.0f,0.0f,0.0f,0.0f);
			}else{
				glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
			}
			glfwSwapBuffers(window);

			glfwPollEvents();
		}
	}

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

}

package delay;


import org.lwjgl.glfw.GLFW;
import org.lwjgl.glfw.GLFWKeyCallback;

public class Input extends GLFWKeyCallback {

	public boolean[] keys = new boolean[65536];

	@Override
	public void invoke(long window, int key, int scancode, int action, int mods) {
		keys[key] = action != GLFW.GLFW_RELEASE;
		System.out.println(action);
	}

	public boolean isKeyDown(int keycode) {
		return keys[keycode];
	}

}

Thank's for your effort