GLConfig.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.util.*;
import java.util.regex.*;
import javax.media.opengl.*;

public class GLConfig implements java.io.Serializable, Console.Directory {
    private static final Pattern slvp = Pattern.compile("^(\\d+)\\.(\\d+)");
    public int glslver, glmajver, glminver;
    public int maxlights;
    public float anisotropy;
    public Collection<String> exts;
    public transient GLCapabilitiesImmutable caps;
    public GLSettings pref;
    
    private GLConfig() {
    }
    
    private static int glgeti(GL gl, int param) {
	int[] buf = {0};
	gl.glGetIntegerv(param, buf, 0);
	GOut.checkerr(gl);
	return(buf[0]);
    }

    private static float glgetf(GL gl, int param) {
	float[] buf = {0};
	gl.glGetFloatv(param, buf, 0);
	GOut.checkerr(gl);
	return(buf[0]);
    }

    public static String glconds(GL gl, int param) {
	GOut.checkerr(gl);
	String ret = gl.glGetString(param);
	if(gl.glGetError() != 0)
	    return(null);
	return(ret);
    }

    public static GLConfig fromgl(GL gl, GLContext ctx, GLCapabilitiesImmutable caps) {
	GLConfig c = new GLConfig();
	try {
	    c.glmajver = glgeti(gl, GL2.GL_MAJOR_VERSION);
	    c.glminver = glgeti(gl, GL2.GL_MINOR_VERSION);
	} catch(GOut.GLException e) {
	    c.glmajver = 1;
	    c.glminver = 0;
	}
	c.maxlights = glgeti(gl, GL2.GL_MAX_LIGHTS);
	c.exts = Arrays.asList(gl.glGetString(GL.GL_EXTENSIONS).split(" "));
	c.caps = caps;
	c.pref = GLSettings.defconf(c);
	String slv = glconds(gl, GL2.GL_SHADING_LANGUAGE_VERSION);
	if(slv != null) {
	    Matcher m = slvp.matcher(slv);
	    if(m.find()) {
		try {
		    int major = Integer.parseInt(m.group(1));
		    int minor = Integer.parseInt(m.group(2));
		    if((major > 0) || (major < 256) || (minor >= 0) || (minor < 256))
			c.glslver = (major << 8) | minor;
		} catch(NumberFormatException e) {
		}
	    }
	}
	if(c.exts.contains("GL_EXT_texture_filter_anisotropic"))
	    c.anisotropy = glgetf(gl, GL.GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT);
	else
	    c.anisotropy = 0;
	return(c);
    }
    
    public boolean havefsaa() {
	return(exts.contains("GL_ARB_multisample") && caps.getSampleBuffers());
    }
    
    public boolean haveglsl() {
	return(exts.contains("GL_ARB_fragment_shader") && exts.contains("GL_ARB_vertex_shader") && (glslver >= 0x0114));
    }

    public boolean havefbo() {
	return(exts.contains("GL_EXT_framebuffer_object"));
    }

    private transient Map<String, Console.Command> cmdmap = new TreeMap<String, Console.Command>();
    {
	cmdmap.put("gl", new Console.Command() {
		public void run(Console cons, String[] args) throws Exception {
		    if(args.length >= 3) {
			String var = args[1].intern();
			for(GLSettings.Setting<?> s : pref.settings()) {
			    if(s.nm == var) {
				s.set(args[2]);
				pref.dirty = true;
				return;
			    }
			}
			throw(new Exception("No such setting: " + var));
		    }
		}
	    });
	cmdmap.put("glreset", new Console.Command() {
		public void run(Console cons, String[] args) {
		    pref = GLSettings.defconf(GLConfig.this);
		    pref.dirty = true;
		}
	    });
    }
    public Map<String, Console.Command> findcmds() {
	return(cmdmap);
    }
}