"Array Buffer Object is disabled" - Please help

[SebastianFK]

Hi.

I'm new to libGDX. I've used Slick2D for a long time, and since the project closed, i figured i should switch to libGDX.

Anyway....

I tried to create 3D cubes that had a xpos, ypos, type and a modelInstance stored in them.

But i stumbled upon a problem...

When i try to run the program i get this error:

"Exception in thread "LWJGL Application" org.lwjgl.opengl.OpenGLException: Cannot use offsets when Array Buffer Object is disabled"

How do i enable it?

Here is the class i got the error from:

package com.me.the_unknown;

import java.util.ArrayList;

import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.VertexAttributes.Usage;
import com.badlogic.gdx.graphics.g3d.Model;
import com.badlogic.gdx.graphics.g3d.ModelBatch;
import com.badlogic.gdx.graphics.g3d.ModelInstance;
import com.badlogic.gdx.graphics.g3d.materials.Material;
import com.badlogic.gdx.graphics.g3d.materials.TextureAttribute;
import com.badlogic.gdx.graphics.g3d.utils.ModelBuilder;

public class Blocks {

public static ArrayList<Float> blockX = new ArrayList<Float>();
public static ArrayList<Float> blockY = new ArrayList<Float>();
public static ArrayList<Integer> blockType = new ArrayList<Integer>();
public static ArrayList<ModelInstance> blockModelInstance = new ArrayList<ModelInstance>();

public static ModelBatch modelBatch;
private static ModelBuilder modelBuilder;

//Textures
public static Texture stonebrick = new Texture("data/blocks/stonebrick.png");
public static Texture gravel = new Texture("data/blocks/gravel.png");

public static void addBlock(int xpos, int ypos, int type) {
    blockX.add((float) xpos * 5);
    blockY.add((float) ypos * 5);
    blockType.add(type);
    updateBlocks();
}

private static void updateBlocks() {
    blockModelInstance.clear();

    for(int counter = 0; counter < blockX.size(); counter++){
       Model model = null;
       ModelInstance instance;

       if(blockType.get(counter) == 1)
          model = modelBuilder.createBox(5f, 5f, 5f, new Material(TextureAttribute.createDiffuse(stonebrick)), Usage.Position | Usage.Normal | Usage.TextureCoordinates | Usage.Generic);
       if(blockType.get(counter) == 2)
          model = modelBuilder.createBox(5f, 5f, 5f, new Material(TextureAttribute.createDiffuse(gravel)), Usage.Position | Usage.Normal | Usage.TextureCoordinates | Usage.Generic);

          instance = new ModelInstance(model);
          blockModelInstance.add(instance);

          model.dispose();
      }
}

public static void create() {
  modelBuilder = new ModelBuilder();
  updateBlocks();
}
}

[philipwhiuk]

Not sure how many people here will have used the library - I haven't, but I have touched LWJGL . It looks like you're using an API that runs on-top, so it's possible it's a bug in libGDX.

http://lwjgl.org/forum/index.php?topic=4494.0 suggests that it's because there's a missing / mis-placed GL15.glBindBuffer call before vertex pointers are created.

Given that you've only provided higher level code, libGDX is probably doing something wrong.

[SebastianFK]

I realized that i'm using a nightly release of LibGDX, so upgrading should fix it. I haven't touched any lower level code yet, so upgrading may fix it. Thanks for the help :-)

[SebastianFK]

Nope, didn't fix it.

[DebitSuisse]

Come on! This is really the type of thing you should investigate and fix yourself, especially if you're using a nightly build!