Fixed an issue where the fpp and all its filters were reinitialized when all filters had been disabled and the first one was re enabled. Thanks to James Mundy to have found this issue.

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@10885 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/core/com/jme3/post/FilterPostProcessor.java

@@ -311,11 +311,7 @@ public class FilterPostProcessor implements SceneProcessor, Savable {
             }
 
         } else {
-            if (renderFrameBufferMS != null) {
-                viewPort.setOutputFrameBuffer(renderFrameBufferMS);
-            } else {
-                viewPort.setOutputFrameBuffer(renderFrameBuffer);
-            }
+           setupViewPortFrameBuffer();
            //if we are ina multiview situation we need to resize the camera 
            //to the viewportsize so that the backbuffer is rendered correctly
            if (multiView) {
@@ -355,11 +351,20 @@ public class FilterPostProcessor implements SceneProcessor, Savable {
         for (int i = filters.size() - 1; i >= 0 && lastFilterIndex == -1; i--) {
             if (filters.get(i).isEnabled()) {
                 lastFilterIndex = i;
+                //the Fpp is initialized, but the viwport framebuffer is the 
+                //original out framebuffer so we must recover from a situation 
+                //where no filter was enabled. So we set th correc framebuffer 
+                //on the viewport
+                if(isInitialized() && viewPort.getOutputFrameBuffer()==outputBuffer){
+                    setupViewPortFrameBuffer();
+                }
                 return;
             }
         }
         if (lastFilterIndex == -1) {
-            cleanup();
+            //There is no enabled filter, we restore the original framebuffer 
+            //to the viewport to bypass the fpp.
+            viewPort.setOutputFrameBuffer(outputBuffer);
         }
     }
 
@@ -439,12 +444,7 @@ public class FilterPostProcessor implements SceneProcessor, Savable {
             Filter filter = it.next();
             initFilter(filter, vp);
         }
-
-        if (renderFrameBufferMS != null) {
-            viewPort.setOutputFrameBuffer(renderFrameBufferMS);
-        } else {
-            viewPort.setOutputFrameBuffer(renderFrameBuffer);
-        }
+        setupViewPortFrameBuffer();
     }
 
     /**
@@ -541,4 +541,12 @@ public class FilterPostProcessor implements SceneProcessor, Savable {
     public List<Filter> getFilterList(){
         return Collections.unmodifiableList(filters);
     }
+
+    private void setupViewPortFrameBuffer() {
+        if (renderFrameBufferMS != null) {
+            viewPort.setOutputFrameBuffer(renderFrameBufferMS);
+        } else {
+            viewPort.setOutputFrameBuffer(renderFrameBuffer);
+        }
+    }
 }