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Java™ Binding for the OpenGL® API
There is a newer version: 2.3.2
/**
 * Copyright 2012 JogAmp Community. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 *    1. Redistributions of source code must retain the above copyright notice, this list of
 *       conditions and the following disclaimer.
 *
 *    2. Redistributions in binary form must reproduce the above copyright notice, this list
 *       of conditions and the following disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * The views and conclusions contained in the software and documentation are those of the
 * authors and should not be interpreted as representing official policies, either expressed
 * or implied, of JogAmp Community.
 */

package javax.media.nativewindow;

import java.util.Comparator;

/**
 * Visual ID holder interface.
 * 
 * Allows queries of different types of native visual IDs,
 * see {@link #getVisualID(int)}.
 * 
 */
public interface VisualIDHolder {
    
    public enum VIDType {
        // Generic Values
        INTRINSIC(0), NATIVE(1),
        // EGL Values
        EGL_CONFIG(10),
        // X11 Values
        X11_XVISUAL(20), X11_FBCONFIG(21),
        // Windows Values
        WIN32_PFD(30); 
        
        public final int id;

        VIDType(int id){
            this.id = id;
        }
    }    
    
    /**
     * Returns the native visual ID of the given type
     * if supported, or {@link #VID_UNDEFINED} if not supported.
     *  
     * Depending on the native windowing system, type is handled as follows:
     * 

     *   X11 throws NativeWindowException on EGL_CONFIG, WIN32_PFD
     *     
     *       INTRINSIC: X11 XVisual ID
     *       NATIVE: X11 XVisual ID
     *       X11_XVISUAL: X11 XVisual ID
     *       X11_FBCONFIG: VID_UNDEFINED
     *     
     *   X11/GL throws NativeWindowException on EGL_CONFIG, WIN32_PFD
     *     
     *       INTRINSIC: X11 XVisual ID
     *       NATIVE: X11 XVisual ID
     *       X11_XVISUAL: X11 XVisual ID
     *       X11_FBCONFIG: X11 FBConfig ID or VID_UNDEFINED
     *     
     *   Windows/GL throws NativeWindowException on EGL_CONFIG, X11_XVISUAL, X11_FBCONFIG 
     *     
     *       INTRINSIC: Win32 PIXELFORMATDESCRIPTOR ID
     *       NATIVE: Win32 PIXELFORMATDESCRIPTOR ID
     *       WIN32_PFD: Win32 PIXELFORMATDESCRIPTOR ID
     *     
     *   EGL/GL throws NativeWindowException on X11_XVISUAL, X11_FBCONFIG, WIN32_PFD
     *     
     *       INTRINSIC: EGL Config ID
     *       NATIVE: EGL NativeVisual ID (X11 XVisual ID, Win32 PIXELFORMATDESCRIPTOR ID, ...)
     *       EGL_CONFIG: EGL Config ID
     *     
     * 
     * 
     * Note: INTRINSIC and NATIVE are always handled,
     *       but may result in {@link #VID_UNDEFINED}. The latter is true if 
     *       the native value are actually undefined or the corresponding object is not 
     *       mapped to a native visual object.
     *       
     * @throws NativeWindowException if type is neither
     *         INTRINSIC nor NATIVE
     *         and does not match the native implementation. 
     */
    int getVisualID(VIDType type) throws NativeWindowException ;
    
    /** 
     * {@link #getVisualID(VIDType)} result indicating an undefined value,
     * which could be cause by an unsupported query.
     * 
     * We assume the const value 0 doesn't reflect a valid native visual ID
     * and is interpreted as no value on all platforms.
     * This is currently true for Android, X11 and Windows.
     *  
     */
    static final int VID_UNDEFINED = 0;
    
    /** Comparing {@link VIDType#NATIVE} */
    public static class VIDComparator implements Comparator {
        private VIDType type;
        
        public VIDComparator(VIDType type) {
            this.type = type;
        }
        
        public int compare(VisualIDHolder vid1, VisualIDHolder vid2) {
            final int id1 = vid1.getVisualID(type);
            final int id2 = vid2.getVisualID(type);

            if(id1 > id2) {
                return 1;
            } else if(id1 < id2) {
                return -1;
            }
            return 0;
        }
    }    
}