1 files changed, 218 insertions, 0 deletions
diff --git a/src/jogl/classes/jogamp/opengl/ExtensionAvailabilityCache.java b/src/jogl/classes/jogamp/opengl/ExtensionAvailabilityCache.java
new file mode 100644
index 000000000..a5fa98bb3
--- /dev/null
+++ b/src/jogl/classes/jogamp/opengl/ExtensionAvailabilityCache.java
@@ -0,0 +1,218 @@
+/*
+ * Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
+ * Copyright (c) 2010 JogAmp Community. 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.jogamp.opengl.impl;
+
+import javax.media.opengl.*;
+import java.util.*;
+
+/**
+ * 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.
+ */
+final class ExtensionAvailabilityCache {
+  protected static final boolean DEBUG = GLContextImpl.DEBUG;
+  private static final boolean DEBUG_AVAILABILITY = Debug.isPropertyDefined("jogl.debug.ExtensionAvailabilityCache", true);
+
+  ExtensionAvailabilityCache(GLContextImpl context)
+  {
+    this.context = context;
+  }
+
+  /**
+   * Flush the cache. The cache will be rebuilt lazily as calls to {@link
+   * #isExtensionAvailable(String)} are received.
+   */
+  final void flush()
+  {
+    if(DEBUG) {
+        System.out.println("ExtensionAvailabilityCache: Flush availability OpenGL "+context.getGLVersion());
+    }
+    availableExtensionCache.clear();
+    initialized = false;
+  }
+
+  /**
+   * Flush the cache and rebuild the cache.
+   */
+  final void reset() {
+    flush();
+    initAvailableExtensions();
+  }
+
+  final boolean isInitialized() {
+    return initialized && !availableExtensionCache.isEmpty() ;
+  }
+
+  final boolean isExtensionAvailable(String glExtensionName) {
+    initAvailableExtensions();
+    return availableExtensionCache.contains(mapGLExtensionName(glExtensionName));
+  }
+
+  final String getPlatformExtensionsString() {
+    initAvailableExtensions();
+    return glXExtensions;
+  }
+
+  final String getGLExtensionsString() {
+    initAvailableExtensions();
+    if(DEBUG) {
+        System.err.println("ExtensionAvailabilityCache: getGLExtensions() called");
+    }
+    return glExtensions;
+  }
+
+  private final void initAvailableExtensions() {
+    GL gl = context.getGL();
+    // 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() || !initialized) {
+      if (DEBUG) {
+         System.err.println(getThreadName() + ":ExtensionAvailabilityCache: Pre-caching init "+gl+", OpenGL "+context.getGLVersion());
+      }
+
+      boolean useGetStringi = false;
+
+      // Use 'glGetStringi' only for ARB GL3 context,
+      // on GL2 platforms the function might be available, but not working.
+      if ( context.isGL3() ) {
+          if ( ! context.isFunctionAvailable("glGetStringi") ) {
+            if(DEBUG) {
+                System.err.println("GLContext: GL >= 3.1 usage, but no glGetStringi");
+            }
+          } else {
+              useGetStringi = true;
+          }
+      }
+
+      if (DEBUG) {
+        System.err.println(getThreadName() + ":ExtensionAvailabilityCache: Pre-caching extension availability OpenGL "+context.getGLVersion()+
+                           ", use "+ ( useGetStringi ? "glGetStringi" : "glGetString" ) );
+      }
+
+      StringBuffer sb = new StringBuffer();
+      if(useGetStringi) {
+        GL2GL3 gl2gl3 = gl.getGL2GL3();
+        int[] numExtensions = { 0 } ;
+        gl2gl3.glGetIntegerv(gl2gl3.GL_NUM_EXTENSIONS, numExtensions, 0);
+        for (int i = 0; i < numExtensions[0]; i++) {
+            sb.append(gl2gl3.glGetStringi(gl2gl3.GL_EXTENSIONS, i));
+            if(i < numExtensions[0]) {
+                sb.append(" ");
+            }
+        }
+        if (DEBUG) {
+            System.err.println(getThreadName() + ":ExtensionAvailabilityCache: GL_EXTENSIONS: "+numExtensions[0]);
+        }
+        if(0==numExtensions[0]) {
+            // fall back ..
+            useGetStringi=false;
+        }
+      }
+      if(!useGetStringi) {
+        sb.append(gl.glGetString(GL.GL_EXTENSIONS));
+      }
+      glExtensions = sb.toString();
+      glXExtensions = context.getPlatformExtensionsString();
+
+      sb.append(" ");
+      sb.append(glXExtensions);
+
+      String allAvailableExtensions = sb.toString();
+      if (DEBUG_AVAILABILITY) {
+        System.err.println(getThreadName() + ":ExtensionAvailabilityCache: 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(getThreadName() + ":ExtensionAvailabilityCache: Available: " + availableExt);
+        }
+      }
+      if (DEBUG) {
+        System.err.println(getThreadName() + ":ExtensionAvailabilityCache: ALL EXTENSIONS: "+availableExtensionCache.size());
+      }
+
+      int major[] = new int[] { context.getGLVersionMajor() };
+      int minor[] = new int[] { context.getGLVersionMinor() };
+      while (GLContext.isValidGLVersion(major[0], minor[0])) {
+        availableExtensionCache.add("GL_VERSION_" + major[0] + "_" + minor[0]);
+        if (DEBUG) {
+            System.err.println(getThreadName() + ":ExtensionAvailabilityCache: Added GL_VERSION_" + major[0] + "_" + minor[0] + " to known extensions");
+        }
+        if(!GLContext.decrementGLVersion(major, minor)) break;
+      }
+
+      // 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>");
+
+      initialized = true;
+    }
+  }
+
+  // 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 boolean initialized = false;
+  private String glExtensions = null;
+  private String glXExtensions = null;
+  private HashSet availableExtensionCache = new HashSet(50);
+  private GLContextImpl context;
+
+  static String getThreadName() {
+    return Thread.currentThread().getName();
+  }
+
+}