TexCube.java

/*
 *  This file is part of the Haven & Hearth game client.
 *  Copyright (C) 2009 Fredrik Tolf <fredrik@dolda2000.com>, and
 *                     Björn Johannessen <johannessen.bjorn@gmail.com>
 *
 *  Redistribution and/or modification of this file is subject to the
 *  terms of the GNU Lesser General Public License, version 3, as
 *  published by the Free Software Foundation.
 *
 *  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 General Public License for more details.
 *
 *  Other parts of this source tree adhere to other copying
 *  rights. Please see the file `COPYING' in the root directory of the
 *  source tree for details.
 *
 *  A copy the GNU Lesser General Public License is distributed along
 *  with the source tree of which this file is a part in the file
 *  `doc/LPGL-3'. If it is missing for any reason, please see the Free
 *  Software Foundation's website at <http://www.fsf.org/>, or write
 *  to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 *  Boston, MA 02111-1307 USA
 */

package haven;

import java.awt.Color;
import java.awt.image.*;
import java.util.*;
import java.nio.*;
import javax.media.opengl.*;
import haven.TexGL.TexOb;
import static haven.GOut.checkerr;

public class TexCube {
    protected TexOb t = null;
    private Object idmon = new Object();
    protected int tdim;
    protected final BufferedImage back;
    
    public TexCube(BufferedImage img) {
	Coord sz = Utils.imgsz(img);
	tdim = sz.x / 4;
	if((tdim * 4) != sz.x)
	    throw(new RuntimeException("Cube-mapped texture has width undivisible by 4"));
	if((tdim * 3) != sz.y)
	    throw(new RuntimeException("Cube-mapped texture is not 4:3"));
	this.back = img;
    }
    
    private static final int[][] order = {
	{3, 1},			// +X
	{1, 1},			// -X
	{2, 0},			// +Y
	{2, 2},			// -Y
	{2, 1},			// +Z
	{0, 1},			// -Z
    };
    protected void fill(GOut g) {
	GL gl = g.gl;
	Coord dim = new Coord(tdim, tdim);
	for(int i = 0; i < order.length; i++) {
	    ByteBuffer data = ByteBuffer.wrap(TexI.convert(back, dim, new Coord(order[i][0] * tdim, order[i][1] * tdim), dim));
	    gl.glTexImage2D(GL.GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL.GL_RGBA, tdim, tdim, 0, GL.GL_RGBA, GL.GL_UNSIGNED_BYTE, data);
	}
    }

    private void create(GOut g) {
	GL2 gl = g.gl;
	t = new TexOb(gl);
	gl.glBindTexture(GL.GL_TEXTURE_CUBE_MAP, t.id);
	gl.glTexParameteri(GL.GL_TEXTURE_CUBE_MAP, GL.GL_TEXTURE_MIN_FILTER, GL.GL_NEAREST);
	gl.glTexParameteri(GL.GL_TEXTURE_CUBE_MAP, GL.GL_TEXTURE_MAG_FILTER, GL.GL_LINEAR);
	fill(g);
	checkerr(gl);
    }

    public int glid(GOut g) {
	GL gl = g.gl;
	synchronized(idmon) {
	    if((t != null) && (t.gl != gl))
		dispose();
	    if(t == null)
		create(g);
	    return(t.id);
	}
    }
    
    public void dispose() {
	synchronized(idmon) {
	    if(t != null) {
		t.dispose();
		t = null;
	    }
	}
    }
}