1 /**
2  * Copyright 2010 JogAmp Community. All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without modification, are
5  * permitted provided that the following conditions are met:
6  *
7  *    1. Redistributions of source code must retain the above copyright notice, this list of
8  *       conditions and the following disclaimer.
9  *
10  *    2. Redistributions in binary form must reproduce the above copyright notice, this list
11  *       of conditions and the following disclaimer in the documentation and/or other materials
12  *       provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
15  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
16  * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
19  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
20  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
21  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
22  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23  *
24  * The views and conclusions contained in the software and documentation are those of the
25  * authors and should not be interpreted as representing official policies, either expressed
26  * or implied, of JogAmp Community.
27  */
28 
29 package jogamp.opengl;
30 
31 import java.util.List;
32 import com.jogamp.nativewindow.CapabilitiesChooser;
33 import com.jogamp.nativewindow.CapabilitiesImmutable;
34 import com.jogamp.nativewindow.GraphicsConfigurationFactory;
35 import com.jogamp.nativewindow.NativeWindowException;
36 import com.jogamp.opengl.DefaultGLCapabilitiesChooser;
37 
38 public abstract class GLGraphicsConfigurationFactory extends GraphicsConfigurationFactory {
39 
chooseCapabilities(CapabilitiesChooser chooser, final CapabilitiesImmutable capsRequested, final List<? extends CapabilitiesImmutable> availableCaps, final int recommendedIndex)40     protected static int chooseCapabilities(CapabilitiesChooser chooser, final CapabilitiesImmutable capsRequested,
41                                             final List<? extends CapabilitiesImmutable> availableCaps, final int recommendedIndex) {
42         if (null == capsRequested) {
43             throw new NativeWindowException("Null requested capabilities");
44         }
45         if ( 0 == availableCaps.size() ) {
46             if (DEBUG) {
47                 System.err.println("Empty available capabilities");
48             }
49             return -1; // none available
50         }
51 
52         if(null == chooser && 0 <= recommendedIndex && capsRequested.isBackgroundOpaque()) {
53             if (DEBUG) {
54                 System.err.println("chooseCapabilities: Using recommendedIndex (opaque): idx " + recommendedIndex);
55             }
56             return recommendedIndex;
57         }
58         int chosenIndex = recommendedIndex;
59 
60         if (null == chooser) {
61             chooser = new DefaultGLCapabilitiesChooser();
62         }
63 
64         try {
65             chosenIndex = chooser.chooseCapabilities(capsRequested, availableCaps, recommendedIndex);
66             if(0 <= chosenIndex) {
67                 if (DEBUG) {
68                     System.err.println("chooseCapabilities: Chosen idx " + chosenIndex);
69                 }
70                 return chosenIndex;
71             }
72         } catch (final NativeWindowException e) {
73             if (DEBUG) {
74                 e.printStackTrace();
75             }
76         }
77 
78         // keep on going ..
79         // seek first available one ..
80         for (chosenIndex = 0; chosenIndex < availableCaps.size() && availableCaps.get(chosenIndex) == null; chosenIndex++) {
81             // nop
82         }
83         if (chosenIndex == availableCaps.size()) {
84             // give up ..
85             if (DEBUG) {
86                 System.err.println("chooseCapabilities: Failed .. nothing available, bail out");
87             }
88             return -1;
89         }
90         if (DEBUG) {
91             System.err.println("chooseCapabilities: Fall back to 1st available idx " + chosenIndex);
92         }
93 
94         return chosenIndex;
95     }
96 
97 }
98