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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;
+}