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World Wind is a collection of components that interactively display 3D geographic information within Java applications or applets.
/*
* Copyright (C) 2013 United States Government as represented by the Administrator of the
* National Aeronautics and Space Administration.
* All Rights Reserved.
*/
package gov.nasa.worldwind.util;
import javax.media.nativewindow.*;
import javax.media.opengl.*;
import java.util.List;
/**
* BasicGLCapabilitiesChooser provides an implementation of {@link javax.media.opengl.GLCapabilitiesChooser} for use
* with WorldWindow implementations (for example, WorldWindowGLCanvas and WorldWindowGLJPanel).
*
* BasicGLCapabilitiesChooser extends the behavior of the default GLCapabilitiesChooser by implementing a fallback
* behavior when device supported stereo is requested but is not supported by the hardware. In this case,
* BasicGLCapabilitiesChooser attempts to find a match to the desired capabilities, but without device supported stereo.
* When the application does not request device supported stereo, BasicGLCapabilitiesChooser provides the same behavior
* as DefaultGLCapabilitiesChooser.
*
* @author dcollins
* @version $Id: BasicGLCapabilitiesChooser.java 1739 2013-12-04 03:38:19Z dcollins $
*/
public class BasicGLCapabilitiesChooser extends DefaultGLCapabilitiesChooser
{
/** Constructs a new BasicGLCapabilitiesChooser, but otherwise does nothing. */
public BasicGLCapabilitiesChooser()
{
}
/**
* Overridden to provide a fallback behavior when device supported stereo requested but is not supported by the
* hardware. When the desired GL capabilities does not specify device supported stereo, this calls
* DefaultGLCapabilitiesChooser.chooseCapabilities.
*
* @param desired the desired GL capabilities.
* @param available the list of available GL capabilities on the graphics device.
* @param windowSystemRecommendedChoice an index into the list of available GL capabilities indicating the window
* system's recommended capabilities, or -1 to indicate no recommendation.
*
* @return an index into the list of available GL capabilities.
*/
@Override
public int chooseCapabilities(CapabilitiesImmutable desired,
List available, int windowSystemRecommendedChoice)
{
if (desired instanceof GLCapabilities && ((GLCapabilities) desired).getStereo())
{
return this.chooseStereoCapabilities(desired, available, windowSystemRecommendedChoice);
}
return super.chooseCapabilities(desired, available, windowSystemRecommendedChoice);
}
/**
* Attempts to use the superclass functionality to find a match to the desired GL capabilities in the list of
* available capabilities. This assumes that the desired GL capabilities request device supported stereo. If the
* superclass cannot find a match, this attempts to find a match to the desired capabilities, but without device
* supported stereo.
*
* @param desired the desired GL capabilities.
* @param available the list of available GL capabilities on the graphics device.
* @param windowSystemRecommendedChoice an index into the list of available GL capabilities indicating the window
* system's recommended capabilities, or -1 to indicate no recommendation.
*
* @return an index into the list of available GL capabilities.
*/
protected int chooseStereoCapabilities(CapabilitiesImmutable desired,
List available, int windowSystemRecommendedChoice)
{
try
{
return super.chooseCapabilities(desired, available, windowSystemRecommendedChoice);
}
catch (NativeWindowException e) // superclass cannot find a match
{
Logging.logger().warning(Logging.getMessage("generic.StereoNotSupported"));
}
GLCapabilities fallback = (GLCapabilities) desired.cloneMutable();
fallback.setStereo(false);
return super.chooseCapabilities(fallback, available, windowSystemRecommendedChoice);
}
}