* FilterPostProcessor now crashes early if packed float texture isn't supported - since it is now required by all filters

jme3-core/src/main/java/com/jme3/post/FilterPostProcessor.java

@@ -137,6 +137,11 @@ public class FilterPostProcessor implements SceneProcessor, Savable {
         fsQuad.setWidth(1);
         fsQuad.setHeight(1);
         
+        if (!renderer.getCaps().contains(Caps.PackedFloatTexture)) {
+            throw new RendererException("FilterPostProcessor requires the " + 
+                    "video hardware to support packed float texture.");
+        }
+        
         Camera cam = vp.getCamera();
 
         //save view port diensions