EnvironmentCapabilities.java

/**
 * Copyright (c) 2003-2009, Xith3D Project Group all rights reserved.
 * 
 * Portions based on the Java3D interface, Copyright by Sun Microsystems.
 * Many thanks to the developers of Java3D and Sun Microsystems for their
 * innovation and design.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * 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.
 * 
 * Neither the name of the 'Xith3D Project Group' nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER 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) A
 * RISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE
 */
package org.xith3d.utility.platform;

import org.xith3d.render.config.OpenGLLayer;

/**
 * Information regarding specific workarounds.  Because there are so few
 * platform specific workarounds, we centralize the meta data about all of
 * them in one place.  All methods of this class should query very simple
 * information and return boolean.  All methods should leave system state
 * unaffected.  If there is dynamic information necessary to complete the
 * query, it is acceptable to pass read-only parameters; i.e., for
 * anything that is not global to the system.
 *  
 * @author Kevin Finley (aka Horati)
 */
public class EnvironmentCapabilities
{
    private static EnvironmentCapabilities instance = null;
    
    public static EnvironmentCapabilities getInstance()
    {
        if ( EnvironmentCapabilities.instance == null )
        {
            EnvironmentCapabilities.instance = new EnvironmentCapabilities();
        }
        
        return ( EnvironmentCapabilities.instance  );
    }
    
    public boolean isVSyncSwitchingAllowed( OpenGLLayer ogl )
    {
        final boolean result;
        
        if ( ogl == OpenGLLayer.JOGL_SWT )
        {
            switch ( OSInfo.getInstance().getCategory() )
            {
                case MAC_OSX:
                    result = false;
                    break;
                default:
                    result = true;
                    break;
            }
        }
        else
        {
            result = true;
        }
        
        return ( result );
    }
    
    public boolean isIllegalMakeCurrentRequired()
    {
        final boolean result;
        
        switch ( OSInfo.getInstance().getCategory() )
        {
            case LINUX:
                result = true;
                break;
            default:
                result = false;
                break;
        }
        
        return ( result );
    }
    
    private EnvironmentCapabilities()
    {
        // prevent construction
    }
}