FilterPostProcessor now correctly clears the color of the previous render when rendering a new filter, except when in multiviewports.

This fixes the color bleeding when enabling AlphaToCoverage. (see post http://jmonkeyengine.org/groups/graphics/forum/topic/multi-sampling-issues/#post-183919)



git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@9586 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

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

@@ -77,6 +77,7 @@ public class FilterPostProcessor implements SceneProcessor, Savable {
     private int originalHeight;
     private int lastFilterIndex = -1;
     private boolean cameraInit = false;
+    private boolean clearColor= true;
 
     /**
      * Create a FilterProcessor 
@@ -99,7 +100,7 @@ public class FilterPostProcessor implements SceneProcessor, Savable {
      */
     public void addFilter(Filter filter) {
         if (filter == null) {
-            throw new IllegalArgumentException( "Filter cannot be null." );
+            throw new IllegalArgumentException("Filter cannot be null.");
         }
         filters.add(filter);
 
@@ -117,7 +118,7 @@ public class FilterPostProcessor implements SceneProcessor, Savable {
      */
     public void removeFilter(Filter filter) {
         if (filter == null) {
-            throw new IllegalArgumentException( "Filter cannot be null." );
+            throw new IllegalArgumentException("Filter cannot be null.");
         }
         filters.remove(filter);
         filter.cleanup(renderer);
@@ -196,7 +197,7 @@ public class FilterPostProcessor implements SceneProcessor, Savable {
 
         renderManager.setCamera(filterCam, true);
         r.setFrameBuffer(buff);        
-        r.clearBuffers(false, true, true);
+        r.clearBuffers(clearColor, true, true);
         renderManager.renderGeometry(fsQuad);
 
     }
@@ -392,6 +393,16 @@ public class FilterPostProcessor implements SceneProcessor, Savable {
         height = (int) (h * (Math.abs(bottom - top)));
         width = Math.max(1, width);
         height = Math.max(1, height);
+        
+        //Testing original versus actual viewport dimension.
+        //If they are different we are in a multiview situation and color from other view port must not be cleared.
+        //However, not clearing the color can cause issues when AlphaToCoverage is active on the renderer.        
+        if(originalWidth!=width || originalHeight!=height){
+            clearColor = false;
+        }else{
+            clearColor = true;
+        }
+        
         cam.resize(width, height, false);
         cameraInit = true;
         computeDepth = false;