Enhance ExtensionAvailabilityCache ; Expose extension count in GLContext (and clean up)

- GLContext
  - Expose isFunctionAvailable(), isExtensionAvailable(),
           getPlatformExtensionCount(), getGLExtensionCount()
  - sort methods a bit

ExtensionAvailabilityCache:
  - Favor StringBuilder instead of StringBuffer (faster)
  - Resuse set's
  - Hold dedicated counts of extensions, platform and GL

1 files changed, 2 insertions, 2 deletions

diff --git a/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXContext.java b/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXContext.java
index 9b154af95..d8813ed7f 100644
--- a/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXContext.java
+++ b/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXContext.java
@@ -465,8 +465,8 @@ public abstract class X11GLXContext extends GLContextImpl {
     }
   }
 
-  protected final StringBuffer getPlatformExtensionsStringImpl() {
-    StringBuffer sb = new StringBuffer();
+  protected final StringBuilder getPlatformExtensionsStringImpl() {
+    StringBuilder sb = new StringBuilder();
     if (DEBUG) {
       System.err.println("!!! GLX Version client version "+ GLXUtil.getClientVersionNumber()+
                          ", server: "+