JOGL GL4 preperation:

  - Re-Enable GL3bc native library build, works ..
  - Adding all the is/get GL4/GL4bc stubs ..
  - Adding dummy interface GL4 and GL4bc, will be removed when done

  - Context creation refactoring:
    - Move Version information to GLContext
    - Determine version by creation if possible (ARB_create_context),
      only use the unreliable GL_VERSION string if necessary.
    - Offering an almost platform independent ARB_create_context path:
        - createContextARBImpl - platform dependent GLX calls
        - createContextARB     - platform independent setup and version loop

17 files changed, 716 insertions, 410 deletions

diff --git a/src/jogl/classes/com/jogamp/opengl/impl/ExtensionAvailabilityCache.java b/src/jogl/classes/com/jogamp/opengl/impl/ExtensionAvailabilityCache.java
index f36c4f749..082f006e8 100644
--- a/src/jogl/classes/com/jogamp/opengl/impl/ExtensionAvailabilityCache.java
+++ b/src/jogl/classes/com/jogamp/opengl/impl/ExtensionAvailabilityCache.java
@@ -66,12 +66,10 @@ public final class ExtensionAvailabilityCache {
   public void flush()
   {
     if(DEBUG) {
-        System.out.println("ExtensionAvailabilityCache: Flush availability OpenGL "+majorVersion+"."+minorVersion);
+        System.out.println("ExtensionAvailabilityCache: Flush availability OpenGL "+context.getGLVersion());
     }
     availableExtensionCache.clear();
     initialized = false;
-    majorVersion = 1;
-    minorVersion = 0;
   }
 
   /**
@@ -104,53 +102,23 @@ public final class ExtensionAvailabilityCache {
     return glExtensions;
   }
 
-  public int getMajorVersion() {
-    initAvailableExtensions();
-    return majorVersion;
-  }
-
-  public int getMinorVersion() {
-    initAvailableExtensions();
-    return minorVersion;
-  }
-
   private 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) {
-      GL gl = context.getGL();
-
       if (DEBUG) {
-         System.err.println("ExtensionAvailabilityCache: Pre-caching init "+gl+", GL_VERSION "+gl.glGetString(GL.GL_VERSION));
-      }
-
-      // Set version
-      Version version = new Version(gl.glGetString(GL.GL_VERSION));
-      if (version.isValid()) {
-        majorVersion = version.getMajor();
-        minorVersion = version.getMinor();
-
-        if( !gl.isGL3() &&
-            ( majorVersion > 3 ||
-              ( majorVersion == 3 && minorVersion >= 1 ) ) ) {
-            // downsize version to 3.0 in case we are not using GL3 (3.1)
-            majorVersion = 3;
-            minorVersion = 0;
-        }
+         System.err.println("ExtensionAvailabilityCache: Pre-caching init "+gl+", OpenGL "+context.getGLVersion());
       }
 
       boolean useGetStringi = false;
 
-      if ( majorVersion > 3 ||
-           ( majorVersion == 3 && minorVersion >= 0 ) ||
+      if ( context.getGLVersionMajor() > 3 ||
+           ( context.getGLVersionMajor() == 3 && context.getGLVersionMinor() >= 0 ) ||
            gl.isGL3() ) {
-          if ( ! gl.isGL2GL3() ) {
+          if ( ! gl.isFunctionAvailable("glGetStringi") ) {
             if(DEBUG) {
-                System.err.println("ExtensionAvailabilityCache: GL >= 3.1 usage, but no GL2GL3 interface: "+gl.getClass().getName());
-            }
-          } else if ( ! gl.isFunctionAvailable("glGetStringi") ) {
-            if(DEBUG) {
-                System.err.println("ExtensionAvailabilityCache: GL >= 3.1 usage, but no glGetStringi");
+                System.err.println("GLContext: GL >= 3.1 usage, but no glGetStringi");
             }
           } else {
               useGetStringi = true;
@@ -158,7 +126,7 @@ public final class ExtensionAvailabilityCache {
       }
 
       if (DEBUG) {
-        System.err.println("ExtensionAvailabilityCache: Pre-caching extension availability OpenGL "+majorVersion+"."+minorVersion+
+        System.err.println("ExtensionAvailabilityCache: Pre-caching extension availability OpenGL "+context.getGLVersion()+
                            ", use "+ ( useGetStringi ? "glGetStringi" : "glGetString" ) );
       }
 
@@ -197,39 +165,21 @@ public final class ExtensionAvailabilityCache {
         }
       }
 
-      // Put GL version strings in the table as well
-      // FIXME: this needs to be adjusted when the major rev changes
-      // beyond the known ones
-      int major = majorVersion;
-      int minor = minorVersion;
-      while (major > 0) {
-        while (minor >= 0) {
-          availableExtensionCache.add("GL_VERSION_" + major + "_" + minor);
-          if (DEBUG) {
-            System.err.println("ExtensionAvailabilityCache: Added GL_VERSION_" + major + "_" + minor + " to known extensions");
-          }
-          --minor;
-        }
-
-        switch (major) {
-        case 3:
-          if(gl.isGL3()) {
-              // GL3 is a GL 3.1 forward compatible context,
-              // hence no 2.0, 1.0 - 1.5 GL versions are supported.
-              major=0; 
-          }
-          // Restart loop at version 2.1
-          minor = 1;
-          break;
-        case 2:
-          // Restart loop at version 1.5
-          minor = 5;
-          break;
-        case 1:
-          break;
+      int major[] = new int[] { context.getGLVersionMajor() };
+      int minor[] = new int[] { context.getGLVersionMinor() };
+      if( !gl.isGL3() && !gl.isGL4() &&
+            ( major[0] > 3 ||
+              ( major[0] == 3 && minor[0] >= 1 ) ) ) {
+            // downsize version to 3.0 in case we are not using GL3 (>=3.1)
+            major[0] = 3;
+            minor[0] = 0;
+      }
+      while (GLProfile.isValidGLVersion(major[0], minor[0])) {
+        availableExtensionCache.add("GL_VERSION_" + major[0] + "_" + minor[0]);
+        if (DEBUG) {
+            System.err.println("ExtensionAvailabilityCache: Added GL_VERSION_" + major[0] + "_" + minor[0] + " to known extensions");
         }
-
-        --major;
+        if(!GLProfile.decrementGLVersion(major, minor)) break;
       }
 
       // put a dummy var in here so that the cache is no longer empty even if
@@ -255,136 +205,9 @@ public final class ExtensionAvailabilityCache {
   //
 
   private boolean initialized = false;
-  private int majorVersion = 1;
-  private int minorVersion = 0;
   private String glExtensions = null;
   private String glXExtensions = null;
   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("ExtensionAvailabilityCache: 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
 }
diff --git a/src/jogl/classes/com/jogamp/opengl/impl/GLContextImpl.java b/src/jogl/classes/com/jogamp/opengl/impl/GLContextImpl.java
index 7543a1084..8c5890d1e 100644
--- a/src/jogl/classes/com/jogamp/opengl/impl/GLContextImpl.java
+++ b/src/jogl/classes/com/jogamp/opengl/impl/GLContextImpl.java
@@ -44,6 +44,7 @@ import java.nio.*;
 import java.util.*;
 
 import javax.media.opengl.*;
+import javax.media.nativewindow.*;
 import com.jogamp.nativewindow.impl.NWReflection;
 import com.jogamp.gluegen.runtime.*;
 import com.jogamp.gluegen.runtime.opengl.*;
@@ -122,6 +123,108 @@ public abstract class GLContextImpl extends GLContext {
     return (GLDrawableImpl) getGLDrawable();
   }
 
+  /** 
+   * Platform dependent but harmonized implementation of the <code>ARB_create_context</code>
+   * mechanism to create a context.<br>
+   * The implementation shall verify this context, ie issue a
+   * <code>MakeCurrent</code> call if necessary.<br>
+   *
+   * @param share the shared context or null
+   * @param direct flag if direct is requested
+   * @param ctxOptionFlags <code>ARB_create_context</code> related, see references below
+   * @param major major number
+   * @param minor minor number
+   * @return the valid context if successfull, or null
+   *
+   * @see #CTX_PROFILE_COMPAT
+   * @see #CTX_OPTION_FORWARD
+   * @see #CTX_OPTION_DEBUG
+   */
+  protected abstract long createContextARBImpl(long share, boolean direct, int ctxOptionFlags, 
+                                               int major, int minor);
+
+  private long createContextARB(long share, boolean direct, int ctxOptionFlags, 
+                                int majorMax, int minorMax, 
+                                int majorMin, int minorMin, 
+                                int major[], int minor[]) {
+    major[0]=majorMax;
+    minor[0]=minorMax;
+    long _context=0;
+
+    while ( 0==_context &&
+            GLProfile.isValidGLVersion(major[0], minor[0]) &&
+            ( major[0]>majorMin || major[0]==majorMin && minor[0] >=minorMin ) ) {
+
+        _context = createContextARBImpl(share, direct, ctxOptionFlags, major[0], minor[0]);
+
+        if(0==_context) {
+            if(!GLProfile.decrementGLVersion(major, minor)) break;
+        }
+    }
+    return _context;
+  }
+
+  /**
+   * Platform independent part of using the <code>ARB_create_context</code>
+   * mechanism to create a context.<br>
+   */
+  protected long createContextARB(long share, boolean direct,
+                                  int major[], int minor[], int ctp[]) 
+  {
+    AbstractGraphicsConfiguration config = drawable.getNativeWindow().getGraphicsConfiguration().getNativeGraphicsConfiguration();
+    GLCapabilities glCaps = (GLCapabilities) config.getChosenCapabilities();
+    GLProfile glp = glCaps.getGLProfile();
+    long _context = 0;
+
+    ctp[0] = CTX_IS_ARB_CREATED | CTX_PROFILE_CORE | CTX_OPTION_ANY; // default
+    boolean isBackwardCompatibility = glp.isGL2() || glp.isGL3bc() || glp.isGL4bc() ;
+    int majorMin, minorMin;
+    int majorMax, minorMax;
+    if( glp.isGL4() ) {
+        // ?? majorMax=GLProfile.getMaxMajor(); minorMax=GLProfile.getMaxMinor(majorMax);
+        majorMax=4; minorMax=GLProfile.getMaxMinor(majorMax);
+        majorMin=4; minorMin=0;
+    } else if( glp.isGL3() ) {
+        majorMax=3; minorMax=GLProfile.getMaxMinor(majorMax);
+        majorMin=3; minorMin=1;
+    } else /* if( glp.isGL2() ) */ {
+        majorMax=3; minorMax=0;
+        majorMin=1; minorMin=1; // our minimum desktop OpenGL runtime requirements
+    }
+    // Try the requested ..
+    if(isBackwardCompatibility) {
+        ctp[0] &= ~CTX_PROFILE_CORE ;
+        ctp[0] |=  CTX_PROFILE_COMPAT ;
+    }
+    _context = createContextARB(share, direct, ctp[0], 
+                               /* max */ majorMax, minorMax,
+                               /* min */ majorMin, minorMin,
+                               /* res */ major, minor);
+
+    if(0==_context && !isBackwardCompatibility) {
+        ctp[0] &= ~CTX_PROFILE_COMPAT ;
+        ctp[0] |=  CTX_PROFILE_CORE ;
+        ctp[0] &= ~CTX_OPTION_ANY ;
+        ctp[0] |=  CTX_OPTION_FORWARD ;
+        _context = createContextARB(share, direct, ctp[0], 
+                                   /* max */ majorMax, minorMax,
+                                   /* min */ majorMin, minorMin,
+                                   /* res */ major, minor);
+       if(0==_context) {
+            // Try a compatible one .. even though not requested .. last resort
+            ctp[0] &= ~CTX_PROFILE_CORE ;
+            ctp[0] |=  CTX_PROFILE_COMPAT ;
+            ctp[0] &= ~CTX_OPTION_FORWARD ;
+            ctp[0] |=  CTX_OPTION_ANY ;
+            _context = createContextARB(share, direct, ctp[0], 
+                                       /* max */ majorMax, minorMax,
+                                       /* min */ majorMin, minorMin,
+                                       /* res */ major, minor);
+       }
+    }
+    return _context;
+  }
+
   public int makeCurrent() throws GLException {
     // Support calls to makeCurrent() over and over again with
     // different contexts without releasing them
@@ -272,7 +375,7 @@ public abstract class GLContextImpl extends GLContext {
     if(DEBUG) {
         String sgl1 = (null!=this.gl)?this.gl.getClass().toString()+", "+this.gl.toString():new String("<null>");
         String sgl2 = (null!=gl)?gl.getClass().toString()+", "+gl.toString():new String("<null>");
-        Exception e = new Exception("setGL: "+Thread.currentThread()+", "+sgl1+" -> "+sgl2);
+        Exception e = new Exception("setGL (OpenGL "+getGLVersion()+"): "+Thread.currentThread()+", "+sgl1+" -> "+sgl2);
         e.printStackTrace();
     }
     this.gl = gl;
@@ -282,6 +385,77 @@ public abstract class GLContextImpl extends GLContext {
   public abstract Object getPlatformGLExtensions();
 
   //----------------------------------------------------------------------
+  // Managing the actual OpenGL version, usually figured at creation time.
+  // As a last resort, the GL_VERSION string may be used ..
+  //
+
+  /** 
+   * If major > 0 || minor > 0 : Use passed values, determined at creation time 
+   * If major==0 && minor == 0 : Use GL_VERSION
+   * Otherwise .. don't touch ..
+   */
+  protected void setContextVersion(int major, int minor, int ctp) {
+      if(major>0 || minor>0) {
+          ctxMajorVersion = major;
+          ctxMinorVersion = minor;
+          ctxOptions = ctp;
+          ctxVersionString = getGLVersion(gl, ctxMajorVersion, ctxMinorVersion, ctxOptions, getGL().glGetString(GL.GL_VERSION));
+          return;
+      }
+
+      if(major==0 && minor==0) {
+          String versionStr = getGL().glGetString(GL.GL_VERSION);
+          if(null==versionStr) {
+            throw new GLException("GL_VERSION is NULL: "+this);
+          }
+
+          // Set version
+          Version version = new Version(versionStr);
+          if (version.isValid()) {
+            ctxMajorVersion = version.getMajor();
+            ctxMinorVersion = version.getMinor();
+
+            ctxVersionString = getGLVersion(gl, ctxMajorVersion, ctxMinorVersion, ctxOptions, versionStr);
+            return;
+          }
+      }
+  }
+
+  private static boolean appendString(StringBuffer sb, String string, boolean needColon, boolean condition) {
+    if(condition) {
+        if(needColon) {
+            sb.append(", ");
+        }
+        sb.append(string);
+        needColon=true;
+    }
+    return needColon;
+  }
+
+  protected static String getGLVersion(GL gl, int major, int minor, int ctp, String gl_version) {
+    boolean needColon = false;
+    StringBuffer sb = new StringBuffer();
+    sb.append(major);
+    sb.append(".");
+    sb.append(minor);
+    sb.append(" (");
+    needColon = appendString(sb, "ES", needColon, null!=gl && gl.isGLES());
+    needColon = appendString(sb, "compatibility profile", needColon, 0 != ( CTX_PROFILE_COMPAT & ctp ));
+    needColon = appendString(sb, "core profile",          needColon, 0 != ( CTX_PROFILE_CORE & ctp ));
+    needColon = appendString(sb, "forward compatible",    needColon, 0 != ( CTX_OPTION_FORWARD & ctp ));
+    needColon = appendString(sb, "any",                   needColon, 0 != ( CTX_OPTION_ANY & ctp ));
+    needColon = appendString(sb, "new",                   needColon, 0 != ( CTX_IS_ARB_CREATED & ctp ));
+    needColon = appendString(sb, "old",                   needColon, 0 == ( CTX_IS_ARB_CREATED & ctp ));
+    sb.append(") - ");
+    if(null!=gl_version) {
+        sb.append(gl_version);
+    } else {
+        sb.append("n/a");
+    }
+    return sb.toString();
+  }
+
+  //----------------------------------------------------------------------
   // Helpers for various context implementations
   //
 
@@ -391,8 +565,10 @@ public abstract class GLContextImpl extends GLContext {
    *
    * @param force force the setting, even if is already being set.
    *              This might be usefull if you change the OpenGL implementation.
+   *
+   * @see #setContextVersion
    */
-  protected void setGLFunctionAvailability(boolean force) {
+  protected void setGLFunctionAvailability(boolean force, int major, int minor, int ctp) {
     if(null!=this.gl && null!=glProcAddressTable && !force) {
         return; // already done and not forced
     }
@@ -400,15 +576,17 @@ public abstract class GLContextImpl extends GLContext {
         setGL(createGL(getGLDrawable().getGLProfile()));
     }
 
-    updateGLProcAddressTable();
+    updateGLProcAddressTable(major, minor, ctp);
   }
 
   /**
    * Updates the cache of which GL functions are available for calling through this
    * context. See {@link #isFunctionAvailable(String)} for more information on
    * the definition of "available".
+   *
+   * @see #setContextVersion
    */
-  protected void updateGLProcAddressTable() {
+  protected void updateGLProcAddressTable(int major, int minor, int ctp) {
     if(null==this.gl) {
         throw new GLException("setGLFunctionAvailability not called yet");
     }
@@ -422,6 +600,8 @@ public abstract class GLContextImpl extends GLContext {
     }
     resetProcAddressTable(getGLProcAddressTable());
 
+    setContextVersion(major, minor, ctp);
+
     extensionAvailability.reset();
   }
 
@@ -493,14 +673,6 @@ public abstract class GLContextImpl extends GLContext {
       return extensionAvailability.getGLExtensions();
   }
 
-  public int getMajorVersion() {
-      return extensionAvailability.getMajorVersion();
-  }
-
-  public int getMinorVersion() {
-      return extensionAvailability.getMinorVersion();
-  }
-
   public boolean isExtensionCacheInitialized() {
       return extensionAvailability.isInitialized();
   }
@@ -617,4 +789,131 @@ public abstract class GLContextImpl extends GLContext {
 
   */
 
+  /**
+   * 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)
+      {
+        e.printStackTrace();
+        // FIXME: refactor desktop OpenGL dependencies and make this
+        // class work properly for OpenGL ES
+        System.err.println("ExtensionAvailabilityCache: 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
+
 }
diff --git a/src/jogl/classes/com/jogamp/opengl/impl/egl/EGLContext.java b/src/jogl/classes/com/jogamp/opengl/impl/egl/EGLContext.java
index a96736c00..31dbd46ae 100755
--- a/src/jogl/classes/com/jogamp/opengl/impl/egl/EGLContext.java
+++ b/src/jogl/classes/com/jogamp/opengl/impl/egl/EGLContext.java
@@ -113,7 +113,7 @@ public abstract class EGLContext extends GLContextImpl {
         }
 
         if (created) {
-            setGLFunctionAvailability(false);
+            setGLFunctionAvailability(false, -1, -1, -1);
             return CONTEXT_CURRENT_NEW;
         }
         return CONTEXT_CURRENT;
@@ -150,6 +150,10 @@ public abstract class EGLContext extends GLContextImpl {
       }
     }
 
+    protected long createContextARBImpl(long share, boolean direct, int ctp, int major, int minor) {
+        return 0; // FIXME
+    }
+
     protected void create() throws GLException {
         long eglDisplay = ((EGLDrawable)drawable).getDisplay();
         EGLGraphicsConfiguration config = ((EGLDrawable)drawable).getGraphicsConfiguration();
@@ -215,14 +219,14 @@ public abstract class EGLContext extends GLContextImpl {
             throw new GLException("Error making context 0x" +
                                   Long.toHexString(eglContext) + " current: error code " + EGL.eglGetError());
         }
-        setGLFunctionAvailability(true);
+        setGLFunctionAvailability(true, contextAttrs[1], 0, CTX_IS_ARB_CREATED|CTX_PROFILE_CORE|CTX_OPTION_ANY);
     }
 
     public boolean isCreated() {
         return (eglContext != 0);
     }
 
-    protected void updateGLProcAddressTable() {
+    protected void updateGLProcAddressTable(int major, int minor, int ctp) {
         if (DEBUG) {
           System.err.println(getThreadName() + ": !!! Initializing EGL extension address table");
         }
@@ -235,7 +239,7 @@ public abstract class EGLContext extends GLContextImpl {
           eglExtProcAddressTable = new EGLExtProcAddressTable();
         }          
         resetProcAddressTable(getEGLExtProcAddressTable());
-        super.updateGLProcAddressTable();
+        super.updateGLProcAddressTable(major, minor, ctp);
     }
   
     public synchronized String getPlatformExtensionsString() {
diff --git a/src/jogl/classes/com/jogamp/opengl/impl/egl/EGLExternalContext.java b/src/jogl/classes/com/jogamp/opengl/impl/egl/EGLExternalContext.java
index de7fd2ba4..0adede4ea 100755
--- a/src/jogl/classes/com/jogamp/opengl/impl/egl/EGLExternalContext.java
+++ b/src/jogl/classes/com/jogamp/opengl/impl/egl/EGLExternalContext.java
@@ -47,7 +47,7 @@ public class EGLExternalContext extends EGLContext {
     public EGLExternalContext(AbstractGraphicsScreen screen) {
         super(null, null);
         GLContextShareSet.contextCreated(this);
-        setGLFunctionAvailability(false);
+        setGLFunctionAvailability(false, 0, 0, 0);
         getGLStateTracker().setEnabled(false); // external context usage can't track state in Java
     }
 
diff --git a/src/jogl/classes/com/jogamp/opengl/impl/macosx/cgl/MacOSXCGLContext.java b/src/jogl/classes/com/jogamp/opengl/impl/macosx/cgl/MacOSXCGLContext.java
index d3a634792..364c2b91b 100644
--- a/src/jogl/classes/com/jogamp/opengl/impl/macosx/cgl/MacOSXCGLContext.java
+++ b/src/jogl/classes/com/jogamp/opengl/impl/macosx/cgl/MacOSXCGLContext.java
@@ -90,6 +90,10 @@ public abstract class MacOSXCGLContext extends GLContextImpl
 
   protected abstract boolean create();
 
+    protected long createContextARBImpl(long share, boolean direct, int ctp, int major, int minor) {
+        return 0; // FIXME
+    }
+
   /**
    * Creates and initializes an appropriate OpenGl nsContext. Should only be
    * called by {@link makeCurrentImpl()}.
@@ -150,7 +154,7 @@ public abstract class MacOSXCGLContext extends GLContextImpl
     if (!CGL.makeCurrentContext(nsContext)) {
       throw new GLException("Error making nsContext current");
     }
-    setGLFunctionAvailability(true);
+    setGLFunctionAvailability(true, 0, 0, 0);
     GLContextShareSet.contextCreated(this);
     return true;
   }    
@@ -184,7 +188,7 @@ public abstract class MacOSXCGLContext extends GLContextImpl
     }
             
     if (created) {
-      setGLFunctionAvailability(false);
+      setGLFunctionAvailability(false, -1, -1, -1);
       return CONTEXT_CURRENT_NEW;
     }
     return CONTEXT_CURRENT;
@@ -251,7 +255,7 @@ public abstract class MacOSXCGLContext extends GLContextImpl
     }
   }
 
-  protected void updateGLProcAddressTable() {
+  protected void updateGLProcAddressTable(int major, int minor, int ctp) {
     if (DEBUG) {
       System.err.println("!!! Initializing CGL extension address table");
     }
@@ -261,7 +265,7 @@ public abstract class MacOSXCGLContext extends GLContextImpl
       cglExtProcAddressTable = new CGLExtProcAddressTable();
     }          
     resetProcAddressTable(getCGLExtProcAddressTable());
-    super.updateGLProcAddressTable();
+    super.updateGLProcAddressTable(major, minor, ctp);
   }
 	
   public String getPlatformExtensionsString()
diff --git a/src/jogl/classes/com/jogamp/opengl/impl/macosx/cgl/MacOSXExternalCGLContext.java b/src/jogl/classes/com/jogamp/opengl/impl/macosx/cgl/MacOSXExternalCGLContext.java
index dde77cde6..248bbb4d6 100644
--- a/src/jogl/classes/com/jogamp/opengl/impl/macosx/cgl/MacOSXExternalCGLContext.java
+++ b/src/jogl/classes/com/jogamp/opengl/impl/macosx/cgl/MacOSXExternalCGLContext.java
@@ -56,7 +56,7 @@ public class MacOSXExternalCGLContext extends MacOSXCGLContext {
     this.cglContext = cglContext;
     this.nsContext = nsContext;
     GLContextShareSet.contextCreated(this);
-    setGLFunctionAvailability(false);
+    setGLFunctionAvailability(false, 0, 0, 0);
     getGLStateTracker().setEnabled(false); // external context usage can't track state in Java
   }
 
diff --git a/src/jogl/classes/com/jogamp/opengl/impl/macosx/cgl/MacOSXPbufferCGLContext.java b/src/jogl/classes/com/jogamp/opengl/impl/macosx/cgl/MacOSXPbufferCGLContext.java
index 446f457be..5844b8edd 100644
--- a/src/jogl/classes/com/jogamp/opengl/impl/macosx/cgl/MacOSXPbufferCGLContext.java
+++ b/src/jogl/classes/com/jogamp/opengl/impl/macosx/cgl/MacOSXPbufferCGLContext.java
@@ -73,7 +73,7 @@ public class MacOSXPbufferCGLContext extends MacOSXCGLContext {
     }
             
     if (created) {
-      setGLFunctionAvailability(false);
+      setGLFunctionAvailability(false, -1, -1, -1);
 
       // Initialize render-to-texture support if requested
       DefaultGraphicsConfiguration config = (DefaultGraphicsConfiguration) drawable.getNativeWindow().getGraphicsConfiguration().getNativeGraphicsConfiguration();
@@ -152,7 +152,7 @@ public class MacOSXPbufferCGLContext extends MacOSXCGLContext {
     if (!impl.makeCurrent(nsContext)) {
       throw new GLException("Error making nsContext current");
     }
-    setGLFunctionAvailability(true);
+    setGLFunctionAvailability(true, 0, 0, 0);
             
     return true;
   }
diff --git a/src/jogl/classes/com/jogamp/opengl/impl/macosx/cgl/awt/MacOSXJava2DCGLContext.java b/src/jogl/classes/com/jogamp/opengl/impl/macosx/cgl/awt/MacOSXJava2DCGLContext.java
index 9010d4461..9189b41f3 100644
--- a/src/jogl/classes/com/jogamp/opengl/impl/macosx/cgl/awt/MacOSXJava2DCGLContext.java
+++ b/src/jogl/classes/com/jogamp/opengl/impl/macosx/cgl/awt/MacOSXJava2DCGLContext.java
@@ -87,7 +87,7 @@ public class MacOSXJava2DCGLContext extends MacOSXCGLContext implements Java2DGL
     }
             
     if (created) {
-      setGLFunctionAvailability(false);
+      setGLFunctionAvailability(false, -1, -1, -1);
       return CONTEXT_CURRENT_NEW;
     }
     return CONTEXT_CURRENT;
diff --git a/src/jogl/classes/com/jogamp/opengl/impl/windows/wgl/WindowsExternalWGLContext.java b/src/jogl/classes/com/jogamp/opengl/impl/windows/wgl/WindowsExternalWGLContext.java
index da8b70eb8..aae376a6c 100755
--- a/src/jogl/classes/com/jogamp/opengl/impl/windows/wgl/WindowsExternalWGLContext.java
+++ b/src/jogl/classes/com/jogamp/opengl/impl/windows/wgl/WindowsExternalWGLContext.java
@@ -56,7 +56,7 @@ public class WindowsExternalWGLContext extends WindowsWGLContext {
       System.err.println(getThreadName() + ": !!! Created external OpenGL context " + toHexString(hglrc) + " for " + this);
     }
     GLContextShareSet.contextCreated(this);
-    setGLFunctionAvailability(false);
+    setGLFunctionAvailability(false, 0, 0, 0);
     cfg.updateCapabilitiesByWGL(this);
     getGLStateTracker().setEnabled(false); // external context usage can't track state in Java
   }
diff --git a/src/jogl/classes/com/jogamp/opengl/impl/windows/wgl/WindowsWGLContext.java b/src/jogl/classes/com/jogamp/opengl/impl/windows/wgl/WindowsWGLContext.java
index b3f4c498c..5b6d65f62 100644
--- a/src/jogl/classes/com/jogamp/opengl/impl/windows/wgl/WindowsWGLContext.java
+++ b/src/jogl/classes/com/jogamp/opengl/impl/windows/wgl/WindowsWGLContext.java
@@ -122,6 +122,10 @@ public class WindowsWGLContext extends GLContextImpl {
 
   protected Map/*<String, String>*/ getExtensionNameMap() { return extensionNameMap; }
 
+    protected long createContextARBImpl(long share, boolean direct, int ctp, int major, int minor) {
+        return 0; // FIXME
+    }
+
   /**
    * Creates and initializes an appropriate OpenGL context. Should only be
    * called by {@link #makeCurrentImpl()}.
@@ -157,7 +161,7 @@ public class WindowsWGLContext extends GLContextImpl {
         if (!WGL.wglMakeCurrent(drawable.getNativeWindow().getSurfaceHandle(), temp_hglrc)) {
             throw new GLException("Error making temp context current: 0x" + Integer.toHexString(WGL.GetLastError()));
         }
-        setGLFunctionAvailability(true);
+        setGLFunctionAvailability(true, 0, 0, 0);
 
         if( !isFunctionAvailable("wglCreateContextAttribsARB") ||
             !isExtensionAvailable("WGL_ARB_create_context") ) {
@@ -243,7 +247,7 @@ public class WindowsWGLContext extends GLContextImpl {
                 if (!WGL.wglMakeCurrent(drawable.getNativeWindow().getSurfaceHandle(), hglrc)) {
                     throw new GLException("Error making old context current: 0x" + Integer.toHexString(WGL.GetLastError()));
                 }
-                updateGLProcAddressTable();
+                updateGLProcAddressTable(0, 0, 0);
                 if(DEBUG) {
                   System.err.println("WindowsWGLContext.create done (old ctx < 3.0 - no 3.0) 0x"+Long.toHexString(hglrc));
                 }
@@ -255,7 +259,7 @@ public class WindowsWGLContext extends GLContextImpl {
                 if (!WGL.wglMakeCurrent(drawable.getNativeWindow().getSurfaceHandle(), hglrc)) {
                     throw new GLException("Error making new context current: 0x" + Integer.toHexString(WGL.GetLastError()));
                 }
-                updateGLProcAddressTable();
+                updateGLProcAddressTable(0, 0, 0);
                 if(DEBUG) {
                   System.err.println("WindowsWGLContext.create done (new ctx >= 3.0) 0x"+Long.toHexString(hglrc));
                 }
@@ -304,7 +308,7 @@ public class WindowsWGLContext extends GLContextImpl {
     }
 
     if (created) {
-      setGLFunctionAvailability(false);
+      setGLFunctionAvailability(false, -1, -1, -1);
 
       WindowsWGLGraphicsConfiguration config = 
         (WindowsWGLGraphicsConfiguration)drawable.getNativeWindow().getGraphicsConfiguration().getNativeGraphicsConfiguration();
@@ -353,7 +357,7 @@ public class WindowsWGLContext extends GLContextImpl {
     }
   }
 
-  protected void updateGLProcAddressTable() {
+  protected void updateGLProcAddressTable(int major, int minor, int ctp) {
     if (DEBUG) {
       System.err.println(getThreadName() + ": !!! Initializing WGL extension address table for " + this);
     }
@@ -369,7 +373,7 @@ public class WindowsWGLContext extends GLContextImpl {
       wglExtProcAddressTable = new WGLExtProcAddressTable();
     }          
     resetProcAddressTable(getWGLExtProcAddressTable());
-    super.updateGLProcAddressTable();
+    super.updateGLProcAddressTable(major, minor, ctp);
   }
   
   public String getPlatformExtensionsString() {
diff --git a/src/jogl/classes/com/jogamp/opengl/impl/x11/glx/X11ExternalGLXContext.java b/src/jogl/classes/com/jogamp/opengl/impl/x11/glx/X11ExternalGLXContext.java
index 783e3278a..b8f25aad7 100755
--- a/src/jogl/classes/com/jogamp/opengl/impl/x11/glx/X11ExternalGLXContext.java
+++ b/src/jogl/classes/com/jogamp/opengl/impl/x11/glx/X11ExternalGLXContext.java
@@ -55,7 +55,7 @@ public class X11ExternalGLXContext extends X11GLXContext {
     super(drawable, null);
     this.context = context;
     GLContextShareSet.contextCreated(this);
-    setGLFunctionAvailability(false);
+    setGLFunctionAvailability(false, 0, 0, 0);
     getGLStateTracker().setEnabled(false); // external context usage can't track state in Java
   }
 
diff --git a/src/jogl/classes/com/jogamp/opengl/impl/x11/glx/X11GLXContext.java b/src/jogl/classes/com/jogamp/opengl/impl/x11/glx/X11GLXContext.java
index 142da672a..1492bfe42 100644
--- a/src/jogl/classes/com/jogamp/opengl/impl/x11/glx/X11GLXContext.java
+++ b/src/jogl/classes/com/jogamp/opengl/impl/x11/glx/X11GLXContext.java
@@ -110,6 +110,70 @@ public abstract class X11GLXContext extends GLContextImpl {
    */
   protected abstract void create();
 
+  protected long createContextARBImpl(long share, boolean direct, int ctp, int major, int minor) {
+    X11GLXGraphicsConfiguration config = (X11GLXGraphicsConfiguration)drawable.getNativeWindow().getGraphicsConfiguration().getNativeGraphicsConfiguration();
+    long display = config.getScreen().getDevice().getHandle();
+    GLXExt glXExt = getGLXExt();
+
+    boolean ctBwdCompat = 0 != ( CTX_PROFILE_COMPAT & ctp ) ;
+    boolean ctFwdCompat = 0 != ( CTX_OPTION_FORWARD & ctp ) ;
+    boolean ctDebug     = 0 != ( CTX_OPTION_DEBUG & ctp ) ;
+
+    long _context=0;
+
+    String verstr = getGLVersion(null, major, minor, ctp, "@creation");
+
+    int attribs[] = {
+        /*  0 */ GLX.GLX_CONTEXT_MAJOR_VERSION_ARB, major,
+        /*  2 */ GLX.GLX_CONTEXT_MINOR_VERSION_ARB, minor,
+        /*  4 */ GLX.GLX_RENDER_TYPE,               GLX.GLX_RGBA_TYPE,
+        /*  6 */ GLX.GLX_CONTEXT_FLAGS_ARB,         0,
+        /*  8 */ 0,                                 0,
+        /* 10 */ 0
+    };
+
+    if ( major > 3 || major == 3 && minor >= 2  ) {
+        // FIXME: Verify with a None drawable binding (default framebuffer)
+        attribs[8+0]  = GLX.GLX_CONTEXT_PROFILE_MASK_ARB;
+        if( ctBwdCompat ) {
+            attribs[8+1]  = GLX.GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB;
+        } else {
+            attribs[8+1]  = GLX.GLX_CONTEXT_CORE_PROFILE_BIT_ARB;
+        } 
+    } 
+
+    if ( major >= 3 ) {
+        if( !ctBwdCompat && ctFwdCompat ) {
+            attribs[6+1] |= GLX.GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
+        }
+        if( ctDebug) {
+            attribs[6+1] |= GLX.GLX_CONTEXT_DEBUG_BIT_ARB;
+        }
+    }
+
+    _context = glXExt.glXCreateContextAttribsARB(display, config.getFBConfig(), share, direct, attribs, 0);
+    if(0==_context) {
+        if(DEBUG) {
+          System.err.println("X11GLXContext.createContextARB couldn't create "+verstr+" _context");
+        }
+    } else {
+        if (!GLX.glXMakeContextCurrent(display,
+                                       drawable.getNativeWindow().getSurfaceHandle(), 
+                                       drawableRead.getNativeWindow().getSurfaceHandle(), 
+                                       _context)) {
+            if(DEBUG) {
+              System.err.println("X11GLXContext.createContextARB couldn't make "+verstr+" context current");
+            }
+            GLX.glXMakeContextCurrent(display, 0, 0, 0);
+            GLX.glXDestroyContext(display, _context);
+            _context = 0;
+        } else if(DEBUG) {
+          System.err.println("X11GLXContext.createContextARB "+verstr+" available "+toHexString(_context));
+        }
+    }
+    return _context;
+  }
+
   /**
    * Creates and initializes an appropriate OpenGL context. Should only be
    * called by {@link create()}.
@@ -133,176 +197,105 @@ public abstract class X11GLXContext extends GLContextImpl {
     }
 
     GLCapabilities glCaps = (GLCapabilities) config.getChosenCapabilities();
+    GLProfile glp = glCaps.getGLProfile();
     isVendorATI = ((X11GLXDrawableFactory)(drawable.getFactoryImpl())).isVendorATI();
 
     if(config.getFBConfigID()<0) {
         // not able to use FBConfig
-        if(glCaps.getGLProfile().isGL3()) {
+        if(glp.isGL3()) {
           throw new GLException("Unable to create OpenGL >= 3.1 context");
         }
         context = GLX.glXCreateContext(display, config.getXVisualInfo(), share, direct);
         if (context == 0) {
-          throw new GLException("Unable to create OpenGL context");
+          throw new GLException("Unable to create context(0)");
         }
         if (!GLX.glXMakeContextCurrent(display,
                                        drawable.getNativeWindow().getSurfaceHandle(), 
                                        drawableRead.getNativeWindow().getSurfaceHandle(), 
                                        context)) {
-          throw new GLException("Error making temp context (old2) current: display "+toHexString(display)+", context "+toHexString(context)+", drawable "+drawable);
+          throw new GLException("Error making temp context(0) current: display "+toHexString(display)+", context "+toHexString(context)+", drawable "+drawable);
         }
-        setGLFunctionAvailability(true);
+        setGLFunctionAvailability(true, 0, 0, 0); // use GL_VERSION
         if(DEBUG) {
-              System.err.println("X11GLXContext.createContext done (old2 ctx) "+toHexString(context));
+              System.err.println("X11GLXContext.createContext(0) done "+toHexString(context));
+        }
+        return;
+    }
+
+    // To use GLX_ARB_create_context, we have to make a temp context current,
+    // so we are able to use GetProcAddress
+    long temp_context = GLX.glXCreateNewContext(display, config.getFBConfig(), GLX.GLX_RGBA_TYPE, share, direct);
+    if (temp_context == 0) {
+        throw new GLException("Unable to create temp OpenGL context(1)");
+    }
+    if (!GLX.glXMakeContextCurrent(display,
+                                   drawable.getNativeWindow().getSurfaceHandle(), 
+                                   drawableRead.getNativeWindow().getSurfaceHandle(), 
+                                   temp_context)) {
+      throw new GLException("Error making temp context(1) current: display "+toHexString(display)+", context "+toHexString(context)+", drawable "+drawable);
+    }
+    setGLFunctionAvailability(true, 0, 0, 0); // use GL_VERSION
+
+    if( !isFunctionAvailable("glXCreateContextAttribsARB") ||
+        !isExtensionAvailable("GLX_ARB_create_context") )  {
+        if(glp.isGL3()) {
+          GLX.glXMakeContextCurrent(display, 0, 0, 0);
+          GLX.glXDestroyContext(display, temp_context);
+          throw new GLException("Unable to create OpenGL >= 3.1 context (no GLX_ARB_create_context)");
         }
 
+        // continue with temp context for GL < 3.0
+        context = temp_context;
+        if(DEBUG) {
+          System.err.println("X11GLXContext.createContext(1) done (!GLX_ARB_create_context) "+toHexString(context));
+        }
+        return;
+    }
+
+    int minor[] = new int[1];
+    int major[] = new int[1];
+    int ctp[] = new int[1];
+    context = createContextARB(share, direct, major, minor, ctp);
+
+    if(0!=context) {
+        // need to update the GL func table ..
+        setGLFunctionAvailability(true, major[0], minor[0], ctp[0]);
+
+        GLX.glXMakeContextCurrent(display, 0, 0, 0);
+        GLX.glXDestroyContext(display, temp_context);
+        if (!GLX.glXMakeContextCurrent(display,
+                                       drawable.getNativeWindow().getSurfaceHandle(), 
+                                       drawableRead.getNativeWindow().getSurfaceHandle(), 
+                                       context)) {
+            throw new GLException("Cannot make previous verified context current");
+        }
+        if(DEBUG) {
+          System.err.println("X11GLXContext.createContext(2) done "+getGLVersion(null, major[0], minor[0], ctp[0], "@creation")+", "+toHexString(context));
+        }
     } else {
+        if(DEBUG) {
+          System.err.println("X11GLXContext.createContext(2) failed "+getGLVersion(null, major[0], minor[0], ctp[0], "@creation"));
+        }
+        if(!glp.isGL2()) {
+          GLX.glXMakeContextCurrent(display, 0, 0, 0);
+          GLX.glXDestroyContext(display, temp_context);
+          throw new GLException("Unable to create context(2) (have GLX_ARB_create_context)");
+        }
 
-        // To use GLX_ARB_create_context, we have to make a temp context current,
-        // so we are able to use GetProcAddress
-        long temp_context = GLX.glXCreateNewContext(display, config.getFBConfig(), GLX.GLX_RGBA_TYPE, share, direct);
-        if (temp_context == 0) {
-            throw new GLException("Unable to create temp OpenGL context");
-        } else {
-            if (!GLX.glXMakeContextCurrent(display,
-                                           drawable.getNativeWindow().getSurfaceHandle(), 
-                                           drawableRead.getNativeWindow().getSurfaceHandle(), 
-                                           temp_context)) {
-              throw new GLException("Error making temp context (old) current: display "+toHexString(display)+", context "+toHexString(context)+", drawable "+drawable);
-            }
-            setGLFunctionAvailability(true);
-
-            if( !isFunctionAvailable("glXCreateContextAttribsARB") ||
-                !isExtensionAvailable("GLX_ARB_create_context") )  {
-                if(glCaps.getGLProfile().isGL3()) {
-                  GLX.glXMakeContextCurrent(display, 0, 0, 0);
-                  GLX.glXDestroyContext(display, temp_context);
-                  throw new GLException("Unable to create OpenGL >= 3.1 context (no GLX_ARB_create_context)");
-                }
-
-                // continue with temp context for GL < 3.0
-                context = temp_context;
-                if(DEBUG) {
-                  System.err.println("X11GLXContext.createContext done (old ctx < 3.0 - no GLX_ARB_create_context) "+toHexString(context));
-                }
-            } else {
-                GLXExt glXExt = getGLXExt();
-
-                // preset with default values
-                int attribs[] = {
-                    /*  0 */ GLX.GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
-                    /*  2 */ GLX.GLX_CONTEXT_MINOR_VERSION_ARB, 0,
-                    /*  4 */ GLX.GLX_RENDER_TYPE,               GLX.GLX_RGBA_TYPE,
-                    /*  6 */ GLX.GLX_CONTEXT_FLAGS_ARB,         0 /* GLX.GLX_CONTEXT_DEBUG_BIT_ARB */,      
-                    /*  8 */ 0,                                 0,
-                    /* 10 */ 0
-                };
-
-                if(glCaps.getGLProfile().isGL3()) {
-                    // Try >= 3.2 core first 
-                    // and verify with a None drawable binding (default framebuffer)
-                    attribs[0+1]  = 3;
-                    attribs[2+1]  = 2;
-                    if(glCaps.getGLProfile().isGL3bc()) {
-                        attribs[8+0]  = GLX.GLX_CONTEXT_PROFILE_MASK_ARB;
-                        attribs[8+1]  = GLX.GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB;
-                    }
-                    /**
-                     * don't stricten requirements any further, even compatible would be fine
-                     *
-                     else {
-                        attribs[8+0]  = GLX.GLX_CONTEXT_PROFILE_MASK_ARB;
-                        attribs[8+1]  = GLX.GLX_CONTEXT_CORE_PROFILE_BIT_ARB;
-                     } 
-                     */
-
-                    context = glXExt.glXCreateContextAttribsARB(display, config.getFBConfig(), share, direct, attribs, 0);
-                    if(0!=context) {
-                        if (!GLX.glXMakeContextCurrent(display,
-                                                       drawable.getNativeWindow().getSurfaceHandle(), 
-                                                       drawableRead.getNativeWindow().getSurfaceHandle(), 
-                                                       context)) {
-                            if(DEBUG) {
-                              System.err.println("X11GLXContext.createContext couldn't make >= 3.2 core context current - fallback");
-                            }
-                            GLX.glXMakeContextCurrent(display, 0, 0, 0);
-                            GLX.glXDestroyContext(display, context);
-                            context = 0;
-                        } else if(DEBUG) {
-                          System.err.println("X11GLXContext.createContext >= 3.2 available "+toHexString(context));
-                        }
-                    } else {
-                        if(DEBUG) {
-                          System.err.println("X11GLXContext.createContext couldn't create >= 3.2 core context - fallback");
-                        }
-                    }
-                    if(0==context) {
-                        // Try >= 3.1 forward compatible - last resort for GL3 !
-                        attribs[0+1]  = 3;
-                        attribs[2+1]  = 1;
-                        if(!glCaps.getGLProfile().isGL3bc()) {
-                            attribs[6+1] |= GLX.GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
-                        }
-                        attribs[8+0]  = 0;
-                        attribs[8+1]  = 0;
-                    }
-                }
-                if(0==context) {
-                    // 3.1 or 3.0 ..
-                    context = glXExt.glXCreateContextAttribsARB(display, config.getFBConfig(), share, direct, attribs, 0);
-                    if(0!=context) {
-                        if (!GLX.glXMakeContextCurrent(display,
-                                                       drawable.getNativeWindow().getSurfaceHandle(), 
-                                                       drawableRead.getNativeWindow().getSurfaceHandle(), 
-                                                       context)) {
-                            if(DEBUG) {
-                              System.err.println("X11GLXContext.createContext couldn't make >= 3.0 core context current - fallback");
-                            }
-                            GLX.glXMakeContextCurrent(display, 0, 0, 0);
-                            GLX.glXDestroyContext(display, context);
-                            context = 0;
-                        } else if(DEBUG) {
-                          System.err.println("X11GLXContext.createContext >= 3.0 available "+toHexString(context));
-                        }
-                    } else {
-                        if(DEBUG) {
-                          System.err.println("X11GLXContext.createContext couldn't create >= 3.0 core context - fallback");
-                        }
-                    }
-                }
-
-                if(0==context) {
-                    if(glCaps.getGLProfile().isGL3()) {
-                      GLX.glXMakeContextCurrent(display, 0, 0, 0);
-                      GLX.glXDestroyContext(display, temp_context);
-                      throw new GLException("Unable to create OpenGL >= 3.1 context (have GLX_ARB_create_context)");
-                    }
-
-                    // continue with temp context for GL < 3.0
-                    context = temp_context;
-                    if (!GLX.glXMakeContextCurrent(display,
-                                                   drawable.getNativeWindow().getSurfaceHandle(), 
-                                                   drawableRead.getNativeWindow().getSurfaceHandle(), 
-                                                   context)) {
-                      GLX.glXMakeContextCurrent(display, 0, 0, 0);
-                      GLX.glXDestroyContext(display, temp_context);
-                      throw new GLException("Error making context (old) current: display "+toHexString(display)+", context "+toHexString(context)+", drawable "+drawable);
-                    }
-                    if(DEBUG) {
-                      System.err.println("X11GLXContext.createContext done (old ctx < 3.0 - no 3.0) "+toHexString(context));
-                    }
-                } else {
-                    GLX.glXDestroyContext(display, temp_context);
-
-                    // need to update the GL func table ..
-                    updateGLProcAddressTable();
-                    if(DEBUG) {
-                      System.err.println("X11GLXContext.createContext done (new ctx >= 3.0) "+toHexString(context));
-                    }
-                }
-            }
-        } 
-    } 
-    GLContextShareSet.contextCreated(this);
+        // continue with temp context for GL <= 3.0
+        context = temp_context;
+        if (!GLX.glXMakeContextCurrent(display,
+                                       drawable.getNativeWindow().getSurfaceHandle(), 
+                                       drawableRead.getNativeWindow().getSurfaceHandle(), 
+                                       context)) {
+          GLX.glXMakeContextCurrent(display, 0, 0, 0);
+          GLX.glXDestroyContext(display, temp_context);
+          throw new GLException("Error making context(1) current: display "+toHexString(display)+", context "+toHexString(context)+", drawable "+drawable);
+        }
+        if(DEBUG) {
+          System.err.println("X11GLXContext.createContext(1) done "+toHexString(context));
+        }
+    }
   }
 
   // Note: Usually the surface shall be locked within [makeCurrent .. swap .. release]
@@ -350,6 +343,7 @@ public abstract class X11GLXContext extends GLContextImpl {
         boolean created = false;
         if (context == 0) {
           create();
+          GLContextShareSet.contextCreated(this);
           if (DEBUG) {
             System.err.println(getThreadName() + ": !!! Created GL context for " + getClass().getName());
           }
@@ -374,7 +368,7 @@ public abstract class X11GLXContext extends GLContextImpl {
         }
 
         if (created) {
-          setGLFunctionAvailability(false);
+          setGLFunctionAvailability(false, -1, -1, -1);
           return CONTEXT_CURRENT_NEW;
         }
         return CONTEXT_CURRENT;
@@ -441,7 +435,7 @@ public abstract class X11GLXContext extends GLContextImpl {
     }
   }
 
-  protected void updateGLProcAddressTable() {
+  protected void updateGLProcAddressTable(int major, int minor, int ctp) {
     if (DEBUG) {
       System.err.println(getThreadName() + ": !!! Initializing GLX extension address table");
     }
@@ -454,7 +448,7 @@ public abstract class X11GLXContext extends GLContextImpl {
       glXExtProcAddressTable = new GLXExtProcAddressTable();
     }          
     resetProcAddressTable(getGLXExtProcAddressTable());
-    super.updateGLProcAddressTable();
+    super.updateGLProcAddressTable(major, minor, ctp);
   }
 
   public synchronized String getPlatformExtensionsString() {
diff --git a/src/jogl/classes/javax/media/opengl/GL4.java b/src/jogl/classes/javax/media/opengl/GL4.java
new file mode 100644
index 000000000..29a316333
--- /dev/null
+++ b/src/jogl/classes/javax/media/opengl/GL4.java
@@ -0,0 +1,5 @@
+package javax.media.opengl;
+
+public interface GL4 extends GLBase {
+}
+
diff --git a/src/jogl/classes/javax/media/opengl/GL4bc.java b/src/jogl/classes/javax/media/opengl/GL4bc.java
new file mode 100644
index 000000000..be1131e91
--- /dev/null
+++ b/src/jogl/classes/javax/media/opengl/GL4bc.java
@@ -0,0 +1,5 @@
+package javax.media.opengl;
+
+public interface GL4bc extends GL4 {
+}
+
diff --git a/src/jogl/classes/javax/media/opengl/GLBase.java b/src/jogl/classes/javax/media/opengl/GLBase.java
index 369907c22..5ba410a61 100644
--- a/src/jogl/classes/javax/media/opengl/GLBase.java
+++ b/src/jogl/classes/javax/media/opengl/GLBase.java
@@ -64,6 +64,20 @@ public interface GLBase {
   public boolean isGL();
 
   /**
+   * Indicates whether this GL object conforms to the GL4 compatibility profile.
+   * The GL4 compatibility profile merges the GL2 profile and GL4 core profile.
+   * @return whether this GL object conforms to the GL4 compatibility profile
+   */
+  public boolean isGL4bc();
+
+  /**
+   * Indicates whether this GL object conforms to the GL4 core profile.
+   * The GL4 core profile reflects OpenGL versions greater or equal 3.1
+   * @return whether this GL object conforms to the GL4 core profile
+   */
+  public boolean isGL4();
+
+  /**
    * Indicates whether this GL object conforms to the GL3 compatibility profile.
    * The GL3 compatibility profile merges the GL2 profile and GL3 core profile.
    * @return whether this GL object conforms to the GL3 compatibility profile
@@ -131,6 +145,20 @@ public interface GLBase {
   public GL getGL() throws GLException;
 
   /**
+   * Casts this object to the GL4bc interface.
+   * @return this object cast to the GL4bc interface
+   * @throws GLException if this GLObject is not a GL4bc implementation
+   */
+  public GL4bc getGL4bc() throws GLException;
+
+  /**
+   * Casts this object to the GL4 interface.
+   * @return this object cast to the GL4 interface
+   * @throws GLException if this GLObject is not a GL4 implementation
+   */
+  public GL4 getGL4() throws GLException;
+
+  /**
    * Casts this object to the GL3bc interface.
    * @return this object cast to the GL3bc interface
    * @throws GLException if this GLObject is not a GL3bc implementation
diff --git a/src/jogl/classes/javax/media/opengl/GLContext.java b/src/jogl/classes/javax/media/opengl/GLContext.java
index 1e52c2a65..a8dbf9213 100644
--- a/src/jogl/classes/javax/media/opengl/GLContext.java
+++ b/src/jogl/classes/javax/media/opengl/GLContext.java
@@ -260,7 +260,9 @@ public abstract class GLContext {
   public final String toString() {
     StringBuffer sb = new StringBuffer();
     sb.append(getClass().getName());
-    sb.append(" [");
+    sb.append(" [OpenGL ");
+    sb.append(getGLVersion());
+    sb.append(", ");
     sb.append(getGL());
     if(getGLDrawable()!=getGLDrawableRead()) {
         sb.append(",\n\tDrawable Read : ");
@@ -280,4 +282,68 @@ public abstract class GLContext {
       GLX) extensions. Can only be called while this context is
       current. */
   public abstract String getPlatformExtensionsString();
+
+  public final int getGLVersionMajor() { return ctxMajorVersion; }
+  public final int getGLVersionMinor() { return ctxMajorVersion; }
+  public final boolean isGLCompatibilityProfile() { return ( 0 != ( CTX_PROFILE_COMPAT & ctxOptions ) ); }
+  public final boolean isGLForwardCompatible()    { return ( 0 != ( CTX_OPTION_FORWARD & ctxOptions ) ); }
+
+  /** 
+   * Returns a valid OpenGL version string, ie 
+   *     <code>major.minor ([option]?[options,]*) - gl-version</code>
+   *
+   * <ul>
+   *   <li> options
+   *   <ul>
+   *     <li> <code>old</code> refers to the non ARB_create_context created context
+   *     <li> <code>new</code> refers to the ARB_create_context created context
+   *     <li> <code>compatible profile</code>
+   *     <li> <code>core profile</code>
+   *     <li> <code>forward compatible</code>
+   *     <li> <code>any</code> refers to the non forward compatible context
+   *     <li> <code>ES</code>  refers to the GLES context variant
+   *   </ul>
+   *   <li> <i>gl-version</i> the GL_VERSION string
+   * </ul>
+   *
+   * e.g.:
+   * <table border="0">
+   * <tr> <td></td> <td></td> </tr>
+   * <tr>
+   * <td>row 2, cell 1</td>
+   * <td>row 2, cell 2</td>
+   * </tr>
+   * </table> 
+   *
+   * <table border="0">
+   *     <tr><td></td>   <td>ES2</td>  <td><code>2.0 (ES, any, new) - 2.0 ES Profile</code></td></tr>
+   *     <tr><td>ATI</td><td>GL2</td>  <td><code>3.0 (compatibility profile, any, new) - 3.2.9704 Compatibility Profile Context</code></td></tr>
+   *     <tr><td>ATI</td><td>GL3</td>  <td><code>3.3 (core profile, any, new) - 1.4 (3.2.9704 Compatibility Profile Context)</code></td></tr>
+   *     <tr><td>ATI</td><td>GL3bc</td><td><code>3.3 (compatibility profile, any, new) - 1.4 (3.2.9704 Compatibility Profile Context)</code></td></tr>
+   *     <tr><td>NV</td><td>GL2</td>   <td><code>3.0 (compatibility profile, any, new) - 3.0.0 NVIDIA 195.36.07.03</code></td></tr>
+   *     <tr><td>NV</td><td>GL3</td>   <td><code>3.3 (core profile, any, new) - 3.3.0 NVIDIA 195.36.07.03</code></td></tr>
+   *     <tr><td>NV</td><td>GL3bc</td> <td><code>3.3 (compatibility profile, any, new) - 3.3.0 NVIDIA 195.36.07.03</code></td></tr>
+   * </table> 
+   */
+  public final String getGLVersion() {
+    return ctxVersionString;
+  }
+
+  protected int ctxMajorVersion=-1;
+  protected int ctxMinorVersion=-1;
+  protected int ctxOptions=0;
+  protected String ctxVersionString=null;
+
+  /** <code>ARB_create_context</code> related: created via ARB_create_context */
+  protected static final int CTX_IS_ARB_CREATED = 1 << 0;
+  /** <code>ARB_create_context</code> related: compatibility profile */
+  protected static final int CTX_PROFILE_COMPAT = 1 << 1;
+  /** <code>ARB_create_context</code> related: core profile */
+  protected static final int CTX_PROFILE_CORE   = 1 << 2;
+  /** <code>ARB_create_context</code> related: flag forward compatible */
+  protected static final int CTX_OPTION_FORWARD = 1 << 3;
+  /** <code>ARB_create_context</code> related: not flag forward compatible */
+  protected static final int CTX_OPTION_ANY     = 1 << 4;
+  /** <code>ARB_create_context</code> related: flag debug */
+  protected static final int CTX_OPTION_DEBUG   = 1 << 5;
 }
diff --git a/src/jogl/classes/javax/media/opengl/GLProfile.java b/src/jogl/classes/javax/media/opengl/GLProfile.java
index 755fae73d..231faab8c 100644
--- a/src/jogl/classes/javax/media/opengl/GLProfile.java
+++ b/src/jogl/classes/javax/media/opengl/GLProfile.java
@@ -62,6 +62,13 @@ public class GLProfile implements Cloneable {
     // Public (user-visible) profiles
     //
 
+    /** The desktop OpenGL compatibility profile 4.x, with x >= 0, ie GL2 plus GL4.<br>
+        <code>bc</code> stands for backward compatibility. */
+    public static final String GL4bc = "GL4bc";
+
+    /** The desktop OpenGL core profile 4.x, with x >= 0 */
+    public static final String GL4   = "GL4";
+
     /** The desktop OpenGL compatibility profile 3.x, with x >= 1, ie GL2 plus GL3.<br>
         <code>bc</code> stands for backward compatibility. */
     public static final String GL3bc = "GL3bc";
@@ -90,12 +97,12 @@ public class GLProfile implements Cloneable {
     /** 
      * All GL Profiles in the order of default detection: GL2, GL2ES2, GL2ES1, GLES2, GLES1, GL2GL3, GL3
      */
-    public static final String[] GL_PROFILE_LIST_ALL = new String[] { GL2, GL2ES2, GL2ES1, GLES2, GLES1, GL2GL3, GL3bc, GL3 };
+    public static final String[] GL_PROFILE_LIST_ALL = new String[] { GL2, GL2ES2, GL2ES1, GLES2, GLES1, GL2GL3, GL4bc, GL3bc, GL4, GL3  };
 
     /**
      * All GL2ES2 Profiles in the order of default detection: GL2ES2, GL2, GLES2, GL3
      */
-    public static final String[] GL_PROFILE_LIST_GL2ES2 = new String[] { GL2ES2, GL2, GLES2, GL3bc, GL3 };
+    public static final String[] GL_PROFILE_LIST_GL2ES2 = new String[] { GL2ES2, GL2, GLES2, GL4bc, GL3bc, GL4, GL3 };
 
     /**
      * All GL2ES1 Profiles in the order of default detection: GL2ES1, GL2, GLES1
@@ -193,7 +200,11 @@ public class GLProfile implements Cloneable {
     }
 
     private static final String getGLImplBaseClassName(String profileImpl) {
-        if(GL3bc.equals(profileImpl)) {
+        if(GL4bc.equals(profileImpl)) {
+            return "com.jogamp.opengl.impl.gl4.GL4bc";
+        } else if(GL4.equals(profileImpl)) {
+            return "com.jogamp.opengl.impl.gl4.GL4";
+        } else if(GL3bc.equals(profileImpl)) {
             return "com.jogamp.opengl.impl.gl3.GL3bc";
         } else if(GL3.equals(profileImpl)) {
             return "com.jogamp.opengl.impl.gl3.GL3";
@@ -254,19 +265,29 @@ public class GLProfile implements Cloneable {
         return profileImpl;
     }
 
+    /** Indicates whether this profile is capable of GL4bc. */
+    public final boolean isGL4bc() {
+        return GL4bc.equals(profile);
+    }
+
+    /** Indicates whether this profile is capable of GL4. */
+    public final boolean isGL4() {
+        return isGL4bc() || GL4.equals(profile);
+    }
+
     /** Indicates whether this profile is capable of GL3bc. */
     public final boolean isGL3bc() {
-        return GL3bc.equals(profile);
+        return isGL4bc() || GL3bc.equals(profile);
     }
 
     /** Indicates whether this profile is capable of GL3. */
     public final boolean isGL3() {
-        return isGL3bc() || GL3.equals(profile);
+        return isGL4() || isGL3bc() || GL3.equals(profile);
     }
 
     /** Indicates whether this profile is capable of GL2. */
     public final boolean isGL2() {
-        return GL2.equals(profile);
+        return isGL3bc() || GL2.equals(profile);
     }
 
     /** Indicates whether this profile is capable of GLES1. */
@@ -294,24 +315,14 @@ public class GLProfile implements Cloneable {
         return GL2GL3.equals(profile) || isGL2() || isGL3() ;
     }
 
-    /** Indicates whether this profile uses the native OpenGL ES1 implementations. */
-    public final boolean usesNativeGLES1() {
-        return GLES1.equals(profileImpl);
+    /** Indicates whether this profile uses the native desktop OpenGL GL4bc implementations. */
+    public final boolean usesNativeGL4bc() {
+        return GL4bc.equals(profileImpl);
     }
 
-    /** Indicates whether this profile uses the native OpenGL ES2 implementations. */
-    public final boolean usesNativeGLES2() {
-        return GLES2.equals(profileImpl);
-    }
-
-    /** Indicates whether this profile uses either of the native OpenGL ES implementations. */
-    public final boolean usesNativeGLES() {
-        return usesNativeGLES2() || usesNativeGLES1();
-    }
-
-    /** Indicates whether this profile uses the native desktop OpenGL GL2 implementations. */
-    public final boolean usesNativeGL2() {
-        return GL2.equals(profileImpl) || GL2ES12.equals(profileImpl) ;
+    /** Indicates whether this profile uses the native desktop OpenGL GL4 implementations. */
+    public final boolean usesNativeGL4() {
+        return usesNativeGL4bc() || GL4.equals(profileImpl);
     }
 
     /** Indicates whether this profile uses the native desktop OpenGL GL3bc implementations. */
@@ -324,9 +335,29 @@ public class GLProfile implements Cloneable {
         return usesNativeGL3bc() || GL3.equals(profileImpl);
     }
 
+    /** Indicates whether this profile uses the native desktop OpenGL GL2 implementations. */
+    public final boolean usesNativeGL2() {
+        return GL2.equals(profileImpl) || GL2ES12.equals(profileImpl) ;
+    }
+
     /** Indicates whether this profile uses the native desktop OpenGL GL2 or GL3 implementations. */
     public final boolean usesNativeGL2GL3() {
-        return usesNativeGL2() || usesNativeGL3() ;
+        return usesNativeGL2() || usesNativeGL3() || usesNativeGL4();
+    }
+
+    /** Indicates whether this profile uses the native OpenGL ES1 implementations. */
+    public final boolean usesNativeGLES1() {
+        return GLES1.equals(profileImpl);
+    }
+
+    /** Indicates whether this profile uses the native OpenGL ES2 implementations. */
+    public final boolean usesNativeGLES2() {
+        return GLES2.equals(profileImpl);
+    }
+
+    /** Indicates whether this profile uses either of the native OpenGL ES implementations. */
+    public final boolean usesNativeGLES() {
+        return usesNativeGLES2() || usesNativeGLES1();
     }
 
     /** Indicates whether this profile supports GLSL. */
@@ -634,6 +665,49 @@ public class GLProfile implements Cloneable {
         return "GLProfile[" + profile + "/" + profileImpl + "]";
     }
 
+    public static final int GL_VERSIONS[][] = {
+        /* 0.*/ { -1 },
+        /* 1.*/ { 0, 1, 2, 3, 4, 5 },
+        /* 2.*/ { 0, 1 },
+        /* 3.*/ { 0, 1, 2, 3 },
+        /* 4.*/ { 0 } };
+
+    public static final int getMaxMajor() {
+        return GL_VERSIONS.length-1;
+    }
+
+    public static final int getMaxMinor(int major) {
+        if(1>major || major>=GL_VERSIONS.length) return -1;
+        return GL_VERSIONS[major].length-1;
+    }
+
+    public static final boolean isValidGLVersion(int major, int minor) {
+        if(1>major || major>=GL_VERSIONS.length) return false;
+        if(0>minor || minor>=GL_VERSIONS[major].length) return false;
+        return true;
+    }
+
+    public static final boolean decrementGLVersion(int major[], int minor[]) {
+        if(null==major || major.length<1 ||null==minor || minor.length<1) {
+            throw new GLException("invalid array arguments");
+        }
+        int m = major[0];
+        int n = minor[0];
+        if(!isValidGLVersion(m, n)) return false;
+
+        // decrement ..
+        n -= 1;
+        if(n < 0) {
+            m -= 1;
+            n = GL_VERSIONS[m].length-1;
+        }
+        if(!isValidGLVersion(m, n)) return false;
+        major[0]=m;
+        minor[0]=n;
+
+        return true;
+    }
+
     // The intersection between desktop OpenGL and the union of the OpenGL ES profiles
     // This is here only to avoid having separate GL2ES1Impl and GL2ES2Impl classes
     private static final String GL2ES12 = "GL2ES12";