nullInvalid value (1281)

[Javapunk]

Was talking on irc and have this bug...
Mazon,   "99% sure you're passing an invalid constant for a method"

Output

/home/kevarh/lwjgl_env/workspace/thingy/com/kevarh/testers/see-hear-speak-trans-center.gif
true
1
nullInvalid value (1281)
org.lwjgl.opengl.OpenGLException: Invalid value (1281)
	at org.lwjgl.opengl.Util.checkGLError(Unknown Source)
		at org.lwjgl.opengl.Display.update(Unknown Source)
			at com.kevarh.testers.Game.run(Game.java:180)
				at com.kevarh.testers.Game.main(Game.java:109)

Source

package com.kevarh.testers;

import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.IntBuffer;

import org.lwjgl.Sys;

import org.lwjgl.input.Keyboard;
import org.lwjgl.openal.AL;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import org.lwjgl.opengl.GL11;

public class Game {

	/** Game title */
	public static final String GAME_TITLE = "My Game";

	/** Desired frame time */
	private static final int FRAMERATE = 60;

	/** Exit the game */
	private static boolean finished;

	/** A rotating square! */
	private static float angle;

	private static float angle2;

	private static int image;

	/**
	 * No constructor needed - this class is static
	 */
	private Game() {

	}

	/**
	 * Application init
	 * 
	 * @param args
	 *            Commandline args
	 */
	public static void main(String[] args) {
		try {
			init();
			Thread.sleep(1000);
			run();
		} catch (Exception e) {
			System.err.println(e.getCause() + e.getMessage());
			e.printStackTrace(System.err);
			Sys.alert(GAME_TITLE, "An error occured and the game will exit.");
		} finally {
			cleanup();
		}
	}

	/**
	 * Initialise the game
	 * 
	 * @throws Exception
	 *             if init fails
	 */
	private static void init() throws Exception {
		// Create a fullscreen window with 1:1 orthographic 2D projection, and
		// with
		// mouse, keyboard, and gamepad inputs.
		Display.setTitle(GAME_TITLE);
		Display.setFullscreen(false);
		// Enable vsync if we can
		Display.setVSyncEnabled(true);

		Display.setDisplayMode(new DisplayMode(640, 480));
		Display.create();
		//GL11.glEnable(GL11.GL_DEPTH_TEST); // Enables Depth Testing
		//GL11.glDepthFunc(GL11.GL_LEQUAL); // The Type Of Depth Testing To Do
		GL11.glHint(GL11.GL_PERSPECTIVE_CORRECTION_HINT, GL11.GL_NICEST);
		GL11.glEnable(GL11.GL_TEXTURE_2D); // Enable Texture Mapping
		GL11.glShadeModel(GL11.GL_SMOOTH); // Enable Smooth Shading
		//GL11.glEnable(GL11.GL_);

		// Start up the sound system
		AL.create();

		// TODO: Load in your textures etc here
		System.out.println(Game.class.getClassLoader().getResource(
				"com/kevarh/testers/" + "see-hear-speak-trans-center.gif")
				.getPath());
		try {
			image = loadTexture(Game.class.getClassLoader().getResource(
					"com/kevarh/testers/" + "see-hear-speak-trans-center.gif")
					.getPath());
			File f = new File(Game.class.getClassLoader().getResource(
					"com/kevarh/testers/" + "see-hear-speak-trans-center.gif")
					.getPath());
			System.out.println(f.exists());
			System.out.println(image);
		} catch (Exception e) {
			System.err.println(e.getCause() + e.getMessage());
			e.printStackTrace();
		}

	}

	/**
	 * Runs the game (the "main loop")
	 */
	private static void run() {
		while (!finished) {
			// Always call Window.update(), all the time
			Display.update();

			if (Display.isCloseRequested()) {
				// Check for O/S close requests
				finished = true;
			} else if (Display.isActive()) {
				// The window is in the foreground, so we should play the game
				logic();
				render();
				Display.sync(FRAMERATE);
			} else {
				// The window is not in the foreground, so we can allow other
				// stuff to run and
				// infrequently update
				try {
					Thread.sleep(100);
				} catch (InterruptedException e) {
				}
				logic();
				if (Display.isVisible() || Display.isDirty()) {
					// Only bother rendering if the window is visible or dirty
					render();
				}
			}
		}
	}

	/**
	 * Do any game-specific cleanup
	 */
	private static void cleanup() {
		// TODO: save anything you want to disk here

		// Stop the sound
		AL.destroy();

		// Close the window
		Display.destroy();
	}

	/**
	 * Do all calculations, handle input, etc.
	 */
	private static void logic() {
		// Example input handler: we'll check for the ESC key and finish the
		// game instantly when it's pressed
		if (Keyboard.isKeyDown(Keyboard.KEY_ESCAPE)) {
			finished = true;
		}

		// TODO: all your game logic goes here.
		angle += 2.0f % 360;
		angle2 -= 2.0f % 360;
	}

	/**
	 * Render the current frame
	 */
	private static void render() {
		GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_STENCIL_BUFFER_BIT);

		// TODO: all your rendering goes here
		GL11.glClear(GL11.GL_COLOR_BUFFER_BIT);

		GL11.glPushMatrix();
		GL11.glTranslatef(Display.getDisplayMode().getWidth() / 2, Display
				.getDisplayMode().getHeight() / 2, 0.0f);
		GL11.glRotatef(angle, 0, 0, 1.0f);
		GL11.glBegin(GL11.GL_QUADS);
		GL11.glVertex2i(-50, -50);
		GL11.glVertex2i(50, -50);
		GL11.glVertex2i(50, 50);
		GL11.glVertex2i(-50, 50);
		GL11.glEnd();
		GL11.glPopMatrix();

		GL11.glPushMatrix();
		GL11.glTranslatef(100, 100, 0.0f);
		GL11.glRotatef(angle2, 0, 0, 1.0f);
		GL11.glColor3f(0.0f, 1.0f, 0.0f);
		GL11.glBegin(GL11.GL_QUADS);
		GL11.glVertex2i(-50, -50);
		GL11.glVertex2i(50, -50);
		GL11.glVertex2i(50, 50);
		GL11.glVertex2i(-50, 50);
		GL11.glEnd();
		GL11.glPopMatrix();
		GL11.glColor3f(1.0f, 1.0f, 1.0f);
	}

	private static final int loadTexture(String path) {
		Image image = (new javax.swing.ImageIcon(path)).getImage();

		// Exctract The Image
		BufferedImage tex = new BufferedImage(image.getWidth(null), image
				.getHeight(null), BufferedImage.TYPE_3BYTE_BGR);
		Graphics2D g = (Graphics2D) tex.getGraphics();
		g.drawImage(image, null, null);
		g.dispose();

		// Flip Image
		AffineTransform tx = AffineTransform.getScaleInstance(1, -1);
		tx.translate(0, -image.getHeight(null));
		AffineTransformOp op = new AffineTransformOp(tx,
				AffineTransformOp.TYPE_NEAREST_NEIGHBOR);
		tex = op.filter(tex, null);

		// Put Image In Memory
		ByteBuffer scratch = ByteBuffer.allocateDirect(4 * tex.getWidth()
				* tex.getHeight());

		byte data[] = (byte[]) tex.getRaster().getDataElements(0, 0,
				tex.getWidth(), tex.getHeight(), null);
		scratch.clear();
		scratch.put(data);
		scratch.rewind();

		// Create A IntBuffer For Image Address In Memory
		IntBuffer buf = ByteBuffer.allocateDirect(4).order(
				ByteOrder.nativeOrder()).asIntBuffer();
		GL11.glGenTextures(buf); // Create Texture In OpenGL

		GL11.glBindTexture(GL11.GL_TEXTURE_2D, buf.get(0));
		// Typical Texture Generation Using Data From The Image

		// Linear Filtering
		GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER,
				GL11.GL_LINEAR);
		// Linear Filtering
		GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER,
				GL11.GL_LINEAR);
		// Generate The Texture
        GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGB, tex.getWidth(),
                tex.getHeight(), 0, GL11.GL_RGB, GL11.GL_UNSIGNED_BYTE, scratch);

		GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGB, tex
						.getWidth(), tex.getHeight(), 0, GL11.GL_RGB,
						GL11.GL_UNSIGNED_BYTE, scratch);

		return buf.get(0); // Return Image Address In Memory

	}
}

[Javapunk]

Forgot to add, If I comment out the second to the last line in loadImage it does not bard.

[spasi]

I couldn't spot your problem, but I have a few (unrelated) suggestions:

1. You're clearing the color buffer twice. The second glClear is unnecessary.
2. Try using ImageIO for reading the image from disk.
3. Use 3 *, not 4, when creating the scratch buffer.
4. Why are you sending the texture data twice? The call you mention is useless, although it shouldn't "bard" :wink:.

[K.I.L.E.R]

I'm stuck in that position as well.

What are the possible causes of such an exception being thrown?

[Matzon]

Whenever you do any opengl errors, they will be caught on a Display.update() (doing error checks each gl call would be too expensive.)

The error typically happens because you supply an invalid enum or perform some stuff without enabling the feature.

[spasi]

I'm stuck in that position as well.

What are the possible causes of such an exception being thrown?

The most probable is what Matzon said, usage of a wrong GL constant on a GL method. Try putting checkGLError around the code you suspect, until you spot the exact method that's producing the error.

Javapunk, try using GL11.GL_RGB8 for the texture's internal format, just in case...

[Javapunk]

The last "GL11.glTexImage2D..." is actually commented out in my version of the source, and yes that is the offending code. If I put checkGLError before and after that code and it return 0 before and 1280 after.  Changing it to GL11.GL_RGB8 does not change a thing, any more ideas?

[spasi]

Bad drivers maybe?

[elias]

Have you checked that your texture image has power of 2 dimensions?

- elias

[princec]

Po2 dimensions is usually what trips me up.

Cas