From a959c53b7ac91e489bf0959391e892790b9ff248 Mon Sep 17 00:00:00 2001
From: Kenneth Russel <kbrussel@alum.mit.edu>
Date: Mon, 15 Jun 2009 22:57:38 +0000
Subject: Copied JOGL_2_SANDBOX r1957 on to trunk; JOGL_2_SANDBOX branch is now
closed
git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/jogl/trunk@1959 232f8b59-042b-4e1e-8c03-345bb8c30851
---
.../opengl/impl/ExtensionAvailabilityCache.java | 277 +++++++++++++++++++++
1 file changed, 277 insertions(+)
create mode 100644 src/jogl/classes/com/sun/opengl/impl/ExtensionAvailabilityCache.java
(limited to 'src/jogl/classes/com/sun/opengl/impl/ExtensionAvailabilityCache.java')
diff --git a/src/jogl/classes/com/sun/opengl/impl/ExtensionAvailabilityCache.java b/src/jogl/classes/com/sun/opengl/impl/ExtensionAvailabilityCache.java
new file mode 100644
index 000000000..63dba3ff0
--- /dev/null
+++ b/src/jogl/classes/com/sun/opengl/impl/ExtensionAvailabilityCache.java
@@ -0,0 +1,277 @@
+/*
+ * 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");
+ private static final boolean DEBUG_AVAILABILITY = Debug.isPropertyDefined("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_AVAILABILITY) {
+ System.err.println("!!! Available: " + availableExt);
+ }
+ }
+
+ // Put GL version strings in the table as well
+ Version version = new Version(gl.glGetString(GL.GL_VERSION));
+ if (version.isValid()) {
+ int major = version.getMajor();
+ int minor = version.getMinor();
+ // FIXME: this needs to be adjusted when the major rev changes
+ // beyond the known ones
+ while (major > 0) {
+ while (minor >= 0) {
+ availableExtensionCache.add("GL_VERSION_" + major + "_" + minor);
+ if (DEBUG) {
+ System.err.println("!!! Added GL_VERSION_" + major + "_" + minor + " to known extensions");
+ }
+ --minor;
+ }
+
+ switch (major) {
+ case 2:
+ // Restart loop at version 1.5
+ minor = 5;
+ break;
+ case 1:
+ break;
+ }
+
+ --major;
+ }
+ }
+
+ // 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;
+
+ /**
+ * A class for storing and comparing OpenGL version numbers.
+ * This only works for desktop OpenGL at the moment.
+ */
+ private static class Version implements Comparable
+ {
+ private boolean valid;
+ private int major, minor, sub;
+ public Version(int majorRev, int minorRev, int subMinorRev)
+ {
+ major = majorRev;
+ minor = minorRev;
+ sub = subMinorRev;
+ }
+
+ /**
+ * @param versionString must be of the form "GL_VERSION_X" or
+ * "GL_VERSION_X_Y" or "GL_VERSION_X_Y_Z" or "X.Y", where X, Y,
+ * and Z are integers.
+ *
+ * @exception IllegalArgumentException if the argument is not a valid
+ * OpenGL version identifier
+ */
+ public Version(String versionString)
+ {
+ try
+ {
+ if (versionString.startsWith("GL_VERSION_"))
+ {
+ StringTokenizer tok = new StringTokenizer(versionString, "_");
+
+ tok.nextToken(); // GL_
+ tok.nextToken(); // VERSION_
+ if (!tok.hasMoreTokens()) { major = 0; return; }
+ major = Integer.valueOf(tok.nextToken()).intValue();
+ if (!tok.hasMoreTokens()) { minor = 0; return; }
+ minor = Integer.valueOf(tok.nextToken()).intValue();
+ if (!tok.hasMoreTokens()) { sub = 0; return; }
+ sub = Integer.valueOf(tok.nextToken()).intValue();
+ }
+ else
+ {
+ int radix = 10;
+ if (versionString.length() > 2) {
+ if (Character.isDigit(versionString.charAt(0)) &&
+ versionString.charAt(1) == '.' &&
+ Character.isDigit(versionString.charAt(2))) {
+ major = Character.digit(versionString.charAt(0), radix);
+ minor = Character.digit(versionString.charAt(2), radix);
+
+ // See if there's version-specific information which might
+ // imply a more recent OpenGL version
+ StringTokenizer tok = new StringTokenizer(versionString, " ");
+ if (tok.hasMoreTokens()) {
+ tok.nextToken();
+ if (tok.hasMoreTokens()) {
+ String token = tok.nextToken();
+ int i = 0;
+ while (i < token.length() && !Character.isDigit(token.charAt(i))) {
+ i++;
+ }
+ if (i < token.length() - 2 &&
+ Character.isDigit(token.charAt(i)) &&
+ token.charAt(i+1) == '.' &&
+ Character.isDigit(token.charAt(i+2))) {
+ int altMajor = Character.digit(token.charAt(i), radix);
+ int altMinor = Character.digit(token.charAt(i+2), radix);
+ // Avoid possibly confusing situations by putting some
+ // constraints on the upgrades we do to the major and
+ // minor versions
+ if ((altMajor == major && altMinor > minor) ||
+ altMajor == major + 1) {
+ major = altMajor;
+ minor = altMinor;
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+ valid = true;
+ }
+ catch (Exception e)
+ {
+ // FIXME: refactor desktop OpenGL dependencies and make this
+ // class work properly for OpenGL ES
+ System.err.println("FunctionAvailabilityCache.Version.<init>: "+e);
+ major = 1;
+ minor = 0;
+ /*
+ throw (IllegalArgumentException)
+ new IllegalArgumentException(
+ "Illegally formatted version identifier: \"" + versionString + "\"")
+ .initCause(e);
+ */
+ }
+ }
+
+ public boolean isValid() {
+ return valid;
+ }
+
+ public int compareTo(Object o)
+ {
+ Version vo = (Version)o;
+ if (major > vo.major) return 1;
+ else if (major < vo.major) return -1;
+ else if (minor > vo.minor) return 1;
+ else if (minor < vo.minor) return -1;
+ else if (sub > vo.sub) return 1;
+ else if (sub < vo.sub) return -1;
+
+ return 0; // they are equal
+ }
+
+ public int getMajor() {
+ return major;
+ }
+
+ public int getMinor() {
+ return minor;
+ }
+
+ } // end class Version
+}
--
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