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Diffstat (limited to 'src/classes/com/sun/opengl/impl/ExtensionAvailabilityCache.java')
-rw-r--r-- | src/classes/com/sun/opengl/impl/ExtensionAvailabilityCache.java | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/src/classes/com/sun/opengl/impl/ExtensionAvailabilityCache.java b/src/classes/com/sun/opengl/impl/ExtensionAvailabilityCache.java new file mode 100644 index 000000000..527ace2a6 --- /dev/null +++ b/src/classes/com/sun/opengl/impl/ExtensionAvailabilityCache.java @@ -0,0 +1,121 @@ +/* + * 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; +} |