AWT/X11 Reduce XQueryExtension 'hang' ; Impl. use XineramaIsActive() instead of XineramaQueryScreens()

- Reenable creating own XDisplay for AWT components, which reduces/removes hang
  in subsequent XQueryExtension call (fetchScreens .. XineramaEnabled())

- Impl. use XineramaIsActive() instead of XineramaQueryScreens()
  Reducing memory allocation, XFree call (which was missing anyways)

2 files changed, 20 insertions, 17 deletions

diff --git a/src/jogl/classes/jogamp/opengl/x11/glx/awt/X11AWTGLXGraphicsConfigurationFactory.java b/src/jogl/classes/jogamp/opengl/x11/glx/awt/X11AWTGLXGraphicsConfigurationFactory.java
index ee7dd280e..5fcc8e4d1 100644
--- a/src/jogl/classes/jogamp/opengl/x11/glx/awt/X11AWTGLXGraphicsConfigurationFactory.java
+++ b/src/jogl/classes/jogamp/opengl/x11/glx/awt/X11AWTGLXGraphicsConfigurationFactory.java
@@ -89,19 +89,21 @@ public class X11AWTGLXGraphicsConfigurationFactory extends GLGraphicsConfigurati
             displayHandle = X11Util.createDisplay(null);
             owner = true;
             if(DEBUG) {
-                System.err.println(Thread.currentThread().getName() + " - X11AWTGLXGraphicsConfigurationFactory: using a thread local X11 display");
+                System.err.println(Thread.currentThread().getName() + " - X11AWTGLXGraphicsConfigurationFactory: create local X11 display");
             }
         } else {
-            if(DEBUG) {
-                System.err.println(Thread.currentThread().getName() + " - X11AWTGLXGraphicsConfigurationFactory: using AWT X11 display 0x"+Long.toHexString(displayHandle));
-            }
             /**
-             * Using the AWT display handle works fine with NVidia and AMD drivers today 2011-02-22,
-             * hence no need for our own display instance anymore.
-               String name = X11Util.XDisplayString(displayHandle);
-               displayHandle = X11Util.createDisplay(name);
-               owner = true;
+             * Using the AWT display handle works fine with NVidia.
+             * However we experienced different results w/ AMD drivers, 
+             * some work, but some behave erratic. 
+             * I.e. hangs in XQueryExtension(..) via X11GraphicsScreen.
              */
+            final String displayName = X11Util.XDisplayString(displayHandle);
+            if(DEBUG) {
+                System.err.println(Thread.currentThread().getName() + " - X11AWTGLXGraphicsConfigurationFactory: create X11 display @ "+displayName+" / 0x"+Long.toHexString(displayHandle));
+            }
+            displayHandle = X11Util.createDisplay(displayName);
+            owner = true;
         }
         ((AWTGraphicsDevice)awtScreen.getDevice()).setSubType(NativeWindowFactory.TYPE_X11, displayHandle);
         X11GraphicsDevice x11Device = new X11GraphicsDevice(displayHandle, AbstractGraphicsDevice.DEFAULT_UNIT);
diff --git a/src/nativewindow/native/x11/XineramaHelper.c b/src/nativewindow/native/x11/XineramaHelper.c
index 25a79645b..a4d380e13 100644
--- a/src/nativewindow/native/x11/XineramaHelper.c
+++ b/src/nativewindow/native/x11/XineramaHelper.c
@@ -37,6 +37,7 @@
 
 #include <gluegen_stdint.h>
 #include <X11/Xlib.h>
+#include <stdio.h>
 
 #ifdef __sun
 
@@ -98,23 +99,23 @@ Bool XineramaEnabled(Display* display) {
   
 #else
 
-  char* XinExtName = "XINERAMA";
+  static const char* XinExtName = "XINERAMA";
   int32_t major_opcode, first_event, first_error;
   Bool gotXinExt = False;
-  int32_t locNumScr = 0;
+  Bool isXinActive = False;
 
-  XineramaScreenInfo *xinInfo;
+  // fprintf(stderr, "XineramaEnabled: p0\n"); fflush(stderr);
 
   gotXinExt = XQueryExtension(display, XinExtName, &major_opcode,
                               &first_event, &first_error);
+  // fprintf(stderr, "XineramaEnabled: p1 gotXinExt %d\n",gotXinExt); fflush(stderr);
 
   if (gotXinExt) {
-    xinInfo = XineramaQueryScreens(display, &locNumScr);
-    if (xinInfo != NULL) {
-      return True;
-    }
+    isXinActive = XineramaIsActive(display);
   }
-  return False;
+  // fprintf(stderr, "XineramaEnabled: p2 XineramaIsActive %d\n", isXinActive); fflush(stderr);
+
+  return isXinActive;
 
 #endif
 }