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/*
* Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution 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 Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*
* Sun gratefully acknowledges that this software was originally authored
* and developed by Kenneth Bradley Russell and Christopher John Kline.
*/
package com.sun.opengl.impl;
import javax.media.opengl.*;
import java.util.*;
// FIXME: refactor Java SE dependencies
//import java.util.regex.*;
import java.lang.reflect.*;
/**
* A utility object intended to be used by implementations to act as a cache
* of which OpenGL extensions are currently available on both the host machine
* and display.
*/
public final class ExtensionAvailabilityCache {
private static final boolean DEBUG = Debug.debug("ExtensionAvailabilityCache");
ExtensionAvailabilityCache(GLContextImpl context)
{
this.context = context;
}
/**
* Flush the cache. The cache will be rebuilt lazily as calls to {@link
* #isExtensionAvailable(String)} are received.
*/
public void flush()
{
availableExtensionCache.clear();
}
public boolean isExtensionAvailable(String glExtensionName) {
initAvailableExtensions();
return availableExtensionCache.contains(mapGLExtensionName(glExtensionName));
}
protected void initAvailableExtensions() {
// if hash is empty (meaning it was flushed), pre-cache it with the list
// of extensions that are in the GL_EXTENSIONS string
if (availableExtensionCache.isEmpty()) {
GL gl = context.getGL();
if (DEBUG) {
System.err.println("!!! Pre-caching extension availability");
}
String allAvailableExtensions =
gl.glGetString(GL.GL_EXTENSIONS) + " " + context.getPlatformExtensionsString();
if (DEBUG) {
System.err.println("!!! Available extensions: " + allAvailableExtensions);
System.err.println("!!! GL vendor: " + gl.glGetString(GL.GL_VENDOR));
}
StringTokenizer tok = new StringTokenizer(allAvailableExtensions);
while (tok.hasMoreTokens()) {
String availableExt = tok.nextToken().trim();
availableExt = availableExt.intern();
availableExtensionCache.add(availableExt);
if (DEBUG) {
System.err.println("!!! Available: " + availableExt);
}
}
// put a dummy var in here so that the cache is no longer empty even if
// no extensions are in the GL_EXTENSIONS string
availableExtensionCache.add("<INTERNAL_DUMMY_PLACEHOLDER>");
}
}
// FIXME: hack to re-enable GL_NV_vertex_array_range extension after
// recent upgrade to new wglext.h and glxext.h headers
private static String mapGLExtensionName(String extensionName) {
if (extensionName != null &&
(extensionName.equals("WGL_NV_vertex_array_range") ||
extensionName.equals("GLX_NV_vertex_array_range")))
return "GL_NV_vertex_array_range";
return extensionName;
}
//----------------------------------------------------------------------
// Internals only below this point
//
private HashSet availableExtensionCache = new HashSet(50);
private GLContextImpl context;
}
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