AWTPrintLifecycle.setupPrint(..): Fix regression of commit a05b87a369441d9ef38f97929f866b3d4ced0e57: NULL printGLAD of GLCanvas and NewtCanvasAWT

We have to pre-init printGLAD w/ current GLAD (similiar w/ GLJPanel).

Also properly define reqNewGLAD:
   reqNewGLAD = !caps.getSampleBuffers() && ( reqNewGLADOnscrn || reqNewGLADSamples || reqNewGLADSize );

where '!caps.getSampleBuffers() && ( .. )' is due to Bug 830,
swapGLContextAndAllGLEventListener and onscreen MSAA w/ NV/GLX does not work.

1 files changed, 8 insertions, 6 deletions

diff --git a/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java b/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
index 767533d40..13affdf49 100644
--- a/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
+++ b/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
@@ -519,24 +519,26 @@ public class NewtCanvasAWT extends java.awt.Canvas implements WindowClosingProto
             if( null != printAnimator ) {
                 printAnimator.remove(glad);
             }
+            printGLAD = glad; // _not_ default, shall be replaced by offscreen GLAD                      
             final GLCapabilities caps = (GLCapabilities)glad.getChosenGLCapabilities().cloneMutable();
             final int printNumSamples = printAWTTiles.getNumSamples(caps);
             GLDrawable printDrawable = printGLAD.getDelegatedDrawable();
             final boolean reqNewGLADSamples = printNumSamples != caps.getNumSamples();
             final boolean reqNewGLADSize = printAWTTiles.customTileWidth != -1 && printAWTTiles.customTileWidth != printDrawable.getWidth() ||
                                            printAWTTiles.customTileHeight != -1 && printAWTTiles.customTileHeight != printDrawable.getHeight();
-            final boolean reqNewGLAD = !caps.getSampleBuffers(); // reqNewGLADSamples || reqNewGLADSize ;
+            final boolean reqNewGLADOnscrn = caps.isOnscreen();
+            
+            // It is desired to use a new offscreen GLAD, however Bug 830 forbids this for AA onscreen context.
+            // Bug 830: swapGLContextAndAllGLEventListener and onscreen MSAA w/ NV/GLX
+            final boolean reqNewGLAD = !caps.getSampleBuffers() && ( reqNewGLADOnscrn || reqNewGLADSamples || reqNewGLADSize );
             if( DEBUG ) {
-                System.err.println("AWT print.setup: reqNewGLAD "+reqNewGLAD+"[ samples "+reqNewGLADSamples+", size "+reqNewGLADSize+"], "+
+                System.err.println("AWT print.setup: reqNewGLAD "+reqNewGLAD+"[ onscreen "+reqNewGLADOnscrn+", samples "+reqNewGLADSamples+", size "+reqNewGLADSize+"], "+
                         ", drawableSize "+printDrawable.getWidth()+"x"+printDrawable.getHeight()+
                         ", customTileSize "+printAWTTiles.customTileWidth+"x"+printAWTTiles.customTileHeight+
                         ", scaleMat "+printAWTTiles.scaleMatX+" x "+printAWTTiles.scaleMatY+
                         ", numSamples "+printAWTTiles.customNumSamples+" -> "+printNumSamples+", printAnimator "+printAnimator);
             }
-            if( caps.getSampleBuffers() ) {
-                // Bug 830: swapGLContextAndAllGLEventListener and onscreen MSAA w/ NV/GLX
-                printGLAD = glad;
-            } else {
+            if( reqNewGLAD ) {
                 caps.setDoubleBuffered(false);
                 caps.setOnscreen(false);
                 if( printNumSamples != caps.getNumSamples() ) {