3 files changed, 36 insertions, 10 deletions
diff --git a/src/jogl/classes/com/jogamp/opengl/GLRendererQuirks.java b/src/jogl/classes/com/jogamp/opengl/GLRendererQuirks.java
index 023a8a1aa..6ef1e0805 100644
--- a/src/jogl/classes/com/jogamp/opengl/GLRendererQuirks.java
+++ b/src/jogl/classes/com/jogamp/opengl/GLRendererQuirks.java
@@ -181,15 +181,22 @@ public class GLRendererQuirks {
      */
     public static final int NoFullFBOSupport = 11;
     
-    
+    /**
+     * GLSL is not compliant or even not stable (crash)
+     * <ul>
+     *   <li>OSX < 10.7.0 (?) - NVidia Driver. Bug 818 @ https://jogamp.org/bugzilla/.</li>
+     * </ul>  
+     */
+    public static final int GLSLNonCompliant = 12;
+        
     /** Number of quirks known. */
-    public static final int COUNT = 12;
+    public static final int COUNT = 13;
     
     private static final String[] _names = new String[] { "NoDoubleBufferedPBuffer", "NoDoubleBufferedBitmap", "NoSetSwapInterval",
                                                           "NoOffscreenBitmap", "NoSetSwapIntervalPostRetarget", "GLSLBuggyDiscard",
                                                           "GLNonCompliant", "GLFlushBeforeRelease", "DontCloseX11Display",
                                                           "NeedCurrCtx4ARBPixFmtQueries", "NeedCurrCtx4ARBCreateContext",
-                                                          "NoFullFBOSupport"
+                                                          "NoFullFBOSupport", "GLSLNonCompliant"
                                                         };
 
     private final int _bitmask;
diff --git a/src/jogl/classes/javax/media/opengl/awt/GLJPanel.java b/src/jogl/classes/javax/media/opengl/awt/GLJPanel.java
index dae631f2a..fb39143b4 100644
--- a/src/jogl/classes/javax/media/opengl/awt/GLJPanel.java
+++ b/src/jogl/classes/javax/media/opengl/awt/GLJPanel.java
@@ -93,6 +93,7 @@ import com.jogamp.common.util.awt.AWTEDTExecutor;
 import com.jogamp.nativewindow.awt.AWTPrintLifecycle;
 import com.jogamp.nativewindow.awt.AWTWindowClosingProtocol;
 import com.jogamp.opengl.FBObject;
+import com.jogamp.opengl.GLRendererQuirks;
 import com.jogamp.opengl.util.GLPixelBuffer.GLPixelAttributes;
 import com.jogamp.opengl.util.GLPixelBuffer.SingletonGLPixelBufferProvider;
 import com.jogamp.opengl.util.GLDrawableUtil;
@@ -1296,7 +1297,15 @@ public class GLJPanel extends JPanel implements AWTGLAutoDrawable, WindowClosing
               flipVertical = offscreenDrawable.isGLOriented();
               final GLCapabilitiesImmutable chosenCaps = offscreenDrawable.getChosenGLCapabilities();
               offscreenIsFBO = chosenCaps.isFBO();
-              if( USE_GLSL_TEXTURE_RASTERIZER && offscreenIsFBO && flipVertical && gl.isGL2ES2() ) {
+              final boolean glslCompliant = !offscreenContext.hasRendererQuirk(GLRendererQuirks.GLSLNonCompliant);
+              final boolean useGLSLFlip = flipVertical && offscreenIsFBO && gl.isGL2ES2() && USE_GLSL_TEXTURE_RASTERIZER && glslCompliant;
+              if( DEBUG ) {
+                  System.err.println(getThreadName()+": OffscreenBackend.initialize: useGLSLFlip "+useGLSLFlip+
+                          " [flip "+flipVertical+", isFBO "+offscreenIsFBO+", isGL2ES2 "+gl.isGL2ES2()+
+                          ", noglsl "+!USE_GLSL_TEXTURE_RASTERIZER+", glslNonCompliant "+!glslCompliant+
+                          ", isGL2ES2 " + gl.isGL2ES2()+"]");
+              }
+              if( useGLSLFlip ) {
                   final boolean _autoSwapBufferMode = helper.getAutoSwapBufferMode();
                   helper.setAutoSwapBufferMode(false);
                   final GLFBODrawable fboDrawable = (GLFBODrawable) offscreenDrawable;
diff --git a/src/jogl/classes/jogamp/opengl/GLContextImpl.java b/src/jogl/classes/jogamp/opengl/GLContextImpl.java
index deb80fe7e..7f9f20a21 100644
--- a/src/jogl/classes/jogamp/opengl/GLContextImpl.java
+++ b/src/jogl/classes/jogamp/opengl/GLContextImpl.java
@@ -1604,13 +1604,23 @@ public abstract class GLContextImpl extends GLContext {
             quirks[i++] = quirk;
         }
         
-        final VersionNumber osxVersionNVFlushClean = new VersionNumber(10,7,3); // < OSX 10.7.3 w/ NV needs glFlush
-        if( Platform.getOSVersionNumber().compareTo(osxVersionNVFlushClean) < 0 && isDriverNVIDIAGeForce ) {
-            final int quirk = GLRendererQuirks.GLFlushBeforeRelease;
-            if(DEBUG) {
-                System.err.println("Quirk: "+GLRendererQuirks.toString(quirk)+": cause: OS "+Platform.getOSType()+", OS Version "+Platform.getOSVersionNumber()+", Renderer "+glRenderer);
+        if( isDriverNVIDIAGeForce ) {
+            final VersionNumber osxVersionNVFlushClean = new VersionNumber(10,7,3); // < OSX 10.7.3 w/ NV needs glFlush
+            if( Platform.getOSVersionNumber().compareTo(osxVersionNVFlushClean) < 0 ) {
+                final int quirk = GLRendererQuirks.GLFlushBeforeRelease;
+                if(DEBUG) {
+                    System.err.println("Quirk: "+GLRendererQuirks.toString(quirk)+": cause: OS "+Platform.getOSType()+", OS Version "+Platform.getOSVersionNumber()+", Renderer "+glRenderer);
+                }
+                quirks[i++] = quirk;
+            }
+            final VersionNumber osxVersionNVGLSLGood = new VersionNumber(10,7,0); // < OSX 10.7.0 w/ NV has instable GLSL
+            if( Platform.getOSVersionNumber().compareTo(osxVersionNVGLSLGood) < 0 ) {
+                final int quirk = GLRendererQuirks.GLSLNonCompliant;
+                if(DEBUG) {
+                    System.err.println("Quirk: "+GLRendererQuirks.toString(quirk)+": cause: OS "+Platform.getOSType()+", OS Version "+Platform.getOSVersionNumber()+", Renderer "+glRenderer);
+                }
+                quirks[i++] = quirk;
             }
-            quirks[i++] = quirk;
         }
     } else if( Platform.getOSType() == Platform.OSType.WINDOWS ) {        
         //