glDrawArrays with VBO crashes when trying to use textures but not with colors.

Newbie & Debugging Questions
#1

Hey,

I have been stumped on this bug for ages now. I am making a voxel engine and I am having an issue using textures with my VBO. Everything was up and working just fine when I was just using colors on the cubes but now that I am trying to use textures the program just crashes when it reaches the glDrawArrays call.

    public void drawChunk() {
        GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, VBOVertexHandle);
        GL11.glVertexPointer(3, GL11.GL_FLOAT, 0, 0L);

        GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, VBOTextureHandle);
        GL11.glTexCoordPointer(2, GL11.GL_FLOAT, 0, 0L);
        GL11.glEnableClientState(GL_TEXTURE_COORD_ARRAY);
        GL11.glEnableClientState(GL_VERTEX_ARRAY);

        GL11.glDrawArrays(GL11.GL_QUADS, 0, ((24)*activateBlocks));
    }


    public void createChunk() {
        VBOTextureHandle = GL15.glGenBuffers();
        VBOVertexHandle = GL15.glGenBuffers();
        FloatBuffer vertexPositionData = BufferUtils.createFloatBuffer(((12*6)*activateBlocks));
        FloatBuffer vertexTextureData = BufferUtils.createFloatBuffer(((8*6)*activateBlocks));
        Random random = new Random();

        dirtTexture.bind();
//
//        float[] cubeColorArray = new float[24*3];
//        for(int i=0; i<24*3; i++) {
//            cubeColorArray[i] = random.nextFloat();
//        }

        for (int x = 0; x < Constants.CHUNK_SIZE; x++) {
            for (int z = 0; z < Constants.CHUNK_SIZE; z++) {
                for (int y = 0; y < Constants.CHUNK_SIZE; y++) {

                    if(occlusionCulling(x, y, z)) {
                        continue;
                    }

                    if(blocks[x][y][z].getActive()) {
                        putVertices((x*2)*Constants.BLOCK_SIZE, (-y*2)*Constants.BLOCK_SIZE, (z*2)*Constants.BLOCK_SIZE, vertexPositionData);

                        vertexTextureData.put(new float[]{
                                0.0f, 0.0f,
                                1.0f, 0.0f,
                                1.0f, 1.0f,
                                0.0f, 1.0f,

                                0.0f, 0.0f,
                                1.0f, 0.0f,
                                1.0f, 1.0f,
                                0.0f, 1.0f,

                                0.0f, 0.0f,
                                1.0f, 0.0f,
                                1.0f, 1.0f,
                                0.0f, 1.0f,

                                0.0f, 0.0f,
                                1.0f, 0.0f,
                                1.0f, 1.0f,
                                0.0f, 1.0f,

                                0.0f, 0.0f,
                                1.0f, 0.0f,
                                1.0f, 1.0f,
                                0.0f, 1.0f,

                                0.0f, 0.0f,
                                1.0f, 0.0f,
                                1.0f, 1.0f,
                                0.0f, 1.0f,
                        });

//                        vertexTextureData.put(cubeColorArray);
                    }
                }
            }
        }

        vertexPositionData.flip();
        GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, VBOVertexHandle);
        GL15.glBufferData(GL15.GL_ARRAY_BUFFER, vertexPositionData, GL15.GL_STATIC_DRAW);
        GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);

        vertexTextureData.flip();
        GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, VBOTextureHandle);
        GL15.glBufferData(GL15.GL_ARRAY_BUFFER, vertexTextureData, GL15.GL_STATIC_DRAW);
        GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
    }

Any insight would be great. I have been stumped on this for hours.

#2

As I said you before, you need to find where the crash occurs. Set breakpoints on every OpenGL call and you can find the one which crashes the program.

#3

I have done so, the program crashes at

GL11.glDrawArrays(GL11.GL_QUADS, 0, ((24)*activateBlocks));

but I can’t for the life of me figure out why the crash is occuring.

#4

Try to get any error codes from glGetError(). See what function gives the error code.