Layer.java

/*
 * Copyright 2012, 2013 Hannes Janetzek
 *
 * This program is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */
package org.oscim.renderer.layer;

import java.nio.ShortBuffer;

/**
 * @authorHannes Janetzek
 */
public abstract class Layer {
	public final static byte LINE = 0;
	public final static byte POLYGON = 1;
	public final static byte TEXLINE = 2;
	public final static byte WAYTEXT = 3;
	public final static byte POITEXT = 4;
	public final static byte SYMBOL = 5;
	public final static byte BITMAP = 6;
	public final static byte EXTRUSION = 7;

	public byte type = -1;

	public Layer next;

	// drawing order from bottom to top
	int level;

	// number of vertices for this layer
	public int verticesCnt;

	// in case of line and polygon layer:
	// - number of VERTICES offset for this layertype in VBO
	// otherwise:
	// - offset in byte in VBO
	public int offset;

	VertexPoolItem pool;
	protected VertexPoolItem curItem;

	abstract protected void compile(ShortBuffer sbuf);
	abstract protected void clear();
}