package nl.sonware.opengltest;

import java.nio.FloatBuffer;
import java.nio.IntBuffer;

import org.lwjgl.BufferUtils;
import org.lwjgl.opengl.GL12;

import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.opengl.ARBVertexBufferObject.*;

public class Block {
    int bufferIndex;
    int bufferSize;
    Block() {

        float[] array = new float[] {
                -1,-1,1,
                1, -1,1,
                1, 1, 1,
                -1,1, 1,

                -1,-1,-1,
                1, -1,-1,
                1,  1,-1,
                -1, 1,-1,
        };

        FloatBuffer buffer = BufferUtils.createFloatBuffer(array.length);
        buffer.put(array);
        buffer.flip();
        bufferSize = buffer.capacity();

        bufferIndex = glGenBuffersARB();

        glBindBufferARB(GL_ARRAY_BUFFER_ARB, bufferIndex);
        glBufferDataARB(GL_ARRAY_BUFFER_ARB, buffer, GL_STATIC_DRAW_ARB);

        System.out.println("Created bufferobject, bufferIndex = " + bufferIndex);
    }

    public void render() {

        glBindBufferARB(GL_ARRAY_BUFFER_ARB, bufferIndex);

        glEnableClientState(GL_VERTEX_ARRAY);
        glVertexPointer(3,GL_FLOAT,0,0);

        glDrawElements(GL_QUADS, bufferSize/3, GL_UNSIGNED_BYTE, 0);

        glBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);

        System.out.println("buffersize = " + bufferSize);
    }
}