3 files changed, 24 insertions, 1 deletions
diff --git a/src/jogl/classes/com/jogamp/opengl/util/RandomTileRenderer.java b/src/jogl/classes/com/jogamp/opengl/util/RandomTileRenderer.java
index dcf229716..8fc7916c7 100644
--- a/src/jogl/classes/com/jogamp/opengl/util/RandomTileRenderer.java
+++ b/src/jogl/classes/com/jogamp/opengl/util/RandomTileRenderer.java
@@ -89,6 +89,11 @@ public class RandomTileRenderer extends TileRendererBase {
         tileRectSet = true;
     }
     
+    @Override
+    public final boolean isSetup() {
+        return 0 < imageSize.getWidth() && 0 < imageSize.getHeight() && tileRectSet;
+    }
+    
     /**
      * {@inheritDoc}
      * @throws IllegalStateException if image-size or tileRect has not been set
diff --git a/src/jogl/classes/com/jogamp/opengl/util/TileRenderer.java b/src/jogl/classes/com/jogamp/opengl/util/TileRenderer.java
index 7c57627e9..f126eb7f5 100644
--- a/src/jogl/classes/com/jogamp/opengl/util/TileRenderer.java
+++ b/src/jogl/classes/com/jogamp/opengl/util/TileRenderer.java
@@ -337,8 +337,13 @@ public class TileRenderer extends TileRendererBase {
     }
 
     @Override
+    public final boolean isSetup() {
+        return 0 < imageSize.getWidth() && 0 < imageSize.getHeight();
+    }
+    
+    @Override
     public final void beginTile( GL gl ) throws IllegalStateException, GLException {
-        if( 0 >= imageSize.getWidth() || 0 >= imageSize.getHeight() ) {
+        if( !isSetup() ) {
             throw new IllegalStateException("Image size has not been set");        
         }
         validateGL(gl);
diff --git a/src/jogl/classes/com/jogamp/opengl/util/TileRendererBase.java b/src/jogl/classes/com/jogamp/opengl/util/TileRendererBase.java
index 5b3644f59..f00e59347 100644
--- a/src/jogl/classes/com/jogamp/opengl/util/TileRendererBase.java
+++ b/src/jogl/classes/com/jogamp/opengl/util/TileRendererBase.java
@@ -313,6 +313,13 @@ public abstract class TileRendererBase {
         }        
     }
     
+    /** 
+     * Returns true if this instance is setup properly, i.e. {@link #setImageSize(int, int)} ..,
+     * and ready for {@link #beginTile(GL)}.
+     * Otherwise returns false.
+     */
+    public abstract boolean isSetup();
+    
     /**
      * Begins rendering a tile.
      * <p>
@@ -577,6 +584,12 @@ public abstract class TileRendererBase {
         }
         @Override
         public void display(GLAutoDrawable drawable) {
+            if( !isSetup() ) {
+                if( DEBUG ) {
+                    System.err.println("TileRenderer.glel.display: !setup: "+TileRendererBase.this);
+                }
+                return;
+            }
             if( null != glEventListenerPre ) {
                 glEventListenerPre.reshape(drawable, 0, 0, currentTileWidth, currentTileHeight);
                 glEventListenerPre.display(drawable);