LWJGL Texture doesn't work

Question

I have the following code:

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

import org.lwjgl.LWJGLException;
import org.lwjgl.input.Keyboard;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import org.lwjgl.opengl.GL11;
import org.newdawn.slick.opengl.Texture;
import org.newdawn.slick.opengl.TextureLoader;

public class GameManager {

    static int DEFAULT_DISPLAY_WIDTH = 855;
    static int DEFAULT_DISPLAY_HEIGHT = 485;

    public void startGame()
    {
        startGame("Unnamed Game");
    }

    public void startGame(String gameTitle)
    {

        new EventGameStart().run();

        try {
            Display.setTitle(gameTitle);
            Display.setDisplayMode(new DisplayMode(DEFAULT_DISPLAY_WIDTH,
                    DEFAULT_DISPLAY_HEIGHT));

            Display.create();
        } catch (LWJGLException e) {
            e.printStackTrace();
            System.exit(0);
        }

        new GameLoader().load();
        Texture texture = null;
        try {
            texture = TextureLoader.getTexture("PNG", new FileInputStream("resources/ball.png"), true);
        } catch (FileNotFoundException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }


        while (!Display.isCloseRequested()) {
            while (Keyboard.next()) {
                if (Keyboard.getEventKey() == Keyboard.KEY_F11
                        && Keyboard.getEventKeyState()) {
                    new EventFullscreen().run();
                }
                if (Keyboard.getEventKey() == Keyboard.KEY_F12
                        && Keyboard.getEventKeyState()) {
                    new EventScreenshot().run();
                }
            }


            GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT);
            GL11.glEnable(GL11.GL_TEXTURE_2D);
            GL11.glBindTexture(GL11.GL_TEXTURE_2D, texture.getTextureID());

            GL11.glBegin(GL11.GL_QUADS);
                GL11.glVertex2f(0, 0);
                GL11.glVertex2f(0 + 200, 0);
                GL11.glVertex2f(0 + 200, 0 + 200);
                GL11.glVertex2f(0, 0 + 200);
            GL11.glEnd();

            Display.update();
        }

        new EventGameClose().run();
        Display.destroy();
    }
}

and the GameLoader():

import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.GL11;

/** Loads the game... */
public class GameLoader extends GameManager {
    /** Called by GameManager */
    public void load() {
        setUpOpenGL();
    }

    /** Loading the OpenGL Settings */
    private void setUpOpenGL()
    {
        GL11.glMatrixMode(GL11.GL_PROJECTION);
        GL11.glLoadIdentity();
        GL11.glOrtho(0, Display.getWidth(), 0, Display.getHeight(), 1, -1);
        GL11.glMatrixMode(GL11.GL_MODELVIEW);    
    }
}

but if I start the script, i only see a black window :(. I don't know what i should do. The packages, I have included are the following:

-lwjgl.jar
-lwjgl_util.jar
-slick-util.jar

Any idea? Thanks :D

Answer 1

That is because you're missing the glTexCoord 's.

You need to add glTexCoord 's before all glVertex calls, the glTexCoord takes two parameters the U & V location on the texture.

GL11.glBegin(GL11.GL_QUADS);
    GL11.glTexCoord2f(0f, 0f);
    GL11.glVertex2f(0, 0);
    GL11.glTexCoord2f(1f, 0f);
    GL11.glVertex2f(0 + 200, 0);
    GL11.glTexCoord2f(1f, 1f);
    GL11.glVertex2f(0 + 200, 0 + 200);
    GL11.glTexCoord2f(0f, 1f);
    GL11.glVertex2f(0, 0 + 200);
GL11.glEnd();

Edit - Comment Request

You need to specify the GL_TEXTURE_MIN_FILTER & GL_TEXTURE_MAG_FILTER .

If you want to keep the pixel look to the texture, you would do the following.

texture.bind(); // First you bind your texture
GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_NEAREST);
GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_NEAREST);

and if you want them back to being "blury", you would do the following.

texture.bind(); // First you bind your texture
GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_LINEAR);
GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_LINEAR);

Remember that for multiple textures you need to call them individually, like this.

texture1.bind();
GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_NEAREST);
GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_NEAREST);

texture2.bind();
GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_NEAREST);
GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_NEAREST);