public class GrassBlock extends Block {

    public GrassBlock(int xx, int yy) {
        x = xx;
        y = yy;

        System.out.println("rendering grass at "+x+","+y);

        try {
            blockTexture = TextureLoader.getTexture("PNG", ResourceLoader.getResourceAsStream("res/grass.png"));
        } catch (IOException ex) {
        }
    }

}

public class Block {

    protected int blockWidth = 30;
    protected int blockHeight = 30;

    public int x = 0;
    public int y = 0;

    public Texture blockTexture;

    public void draw() {
        blockTexture.bind();

        GL11.glBegin(GL11.GL_QUADS);
            GL11.glVertex2f(x, y);

            GL11.glVertex2f(x + blockWidth, y);

            GL11.glVertex2f(x + blockWidth, y + blockHeight);

            GL11.glVertex2f(x, y + blockHeight);

            GL11.glVertex2f(x, y);
        GL11.glEnd();
    }

}