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

1 files changed, 277 insertions, 0 deletions

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
+}