made canDraw() abstract in PGL

core/src/processing/opengl/PGL.java

@@ -714,9 +714,7 @@ public abstract class PGL {
   }
 
 
-  protected boolean canDraw() {
-    return pg.initialized && pg.parent.isDisplayable();
-  }
+  protected abstract boolean canDraw();
 
 
   protected abstract void requestFocus();

core/src/processing/opengl/PJOGL.java

@@ -557,6 +557,12 @@ public class PJOGL extends PGL {
   }
 
 
+  @Override
+  protected boolean canDraw() {
+    return pg.initialized && pg.parent.isDisplayable();
+  }
+
+
   @Override
   protected void requestFocus() { }
 

java/libraries/lwjgl/src/processing/lwjgl/PLWJGL.java

@@ -229,6 +229,11 @@ public class PLWJGL extends PGL {
   // Frame rendering
 
 
+  protected boolean canDraw() {
+    return pg.initialized && pg.parent.isDisplayable();
+  }
+  
+  
   protected void requestFocus() { }