diff --git a/panda/src/display/frameBufferProperties.I b/panda/src/display/frameBufferProperties.I
index 04f5a899dd..924482495e 100644
--- a/panda/src/display/frameBufferProperties.I
+++ b/panda/src/display/frameBufferProperties.I
@@ -124,16 +124,19 @@ is_single_buffered() const {
 }
 
 ////////////////////////////////////////////////////////////////////
-//     Function: FrameBufferProperties::has_mode
+//     Function: FrameBufferProperties::specifies_mode
 //       Access: Published
 //  Description: Returns true if the frame buffer mode, logically
-//               anded with the given mask, is nonzero.  This is a
+//               anded with the given mask, is nonzero and the frame
+//               buffer mode is specified.  This is a
 //               convenience function to access this useful tidbit of
 //               data.
 ////////////////////////////////////////////////////////////////////
 INLINE bool FrameBufferProperties::
-has_mode(int bits) const {
-  nassertr(has_frame_buffer_mode(), false);
+specifies_mode(int bits) const {
+  if ((_specified & S_frame_buffer_mode)==0) {
+    return false;
+  }
   return (_frame_buffer_mode & bits) != 0;
 }
 
diff --git a/panda/src/display/frameBufferProperties.h b/panda/src/display/frameBufferProperties.h
index 4519c302de..efe3ebb277 100644
--- a/panda/src/display/frameBufferProperties.h
+++ b/panda/src/display/frameBufferProperties.h
@@ -62,7 +62,7 @@ PUBLISHED:
   INLINE void set_specified();
   INLINE int get_buffer_mask() const;
   INLINE bool is_any_specified() const;
-  INLINE bool has_mode(int bit) const;
+  INLINE bool specifies_mode(int bit) const;
   INLINE bool is_single_buffered() const;
   INLINE bool is_stereo() const;
 
diff --git a/panda/src/display/graphicsEngine.cxx b/panda/src/display/graphicsEngine.cxx
index 5b5e30d3eb..99dbfd43d5 100644
--- a/panda/src/display/graphicsEngine.cxx
+++ b/panda/src/display/graphicsEngine.cxx
@@ -341,11 +341,11 @@ make_output(GraphicsPipe *pipe,
       ((flags&GraphicsPipe::BF_can_bind_color)==0)&&
       ((flags&GraphicsPipe::BF_can_bind_every)==0)&&
       ((flags&GraphicsPipe::BF_rtt_cumulative)==0)&&
-      (prop.has_mode(FrameBufferProperties::FM_index)==false)&&
-      (prop.has_mode(FrameBufferProperties::FM_buffer)==false)&&
-      (prop.has_mode(FrameBufferProperties::FM_accum)==false)&&
-      (prop.has_mode(FrameBufferProperties::FM_stencil)==false)&&
-      (prop.has_mode(FrameBufferProperties::FM_multisample)==false)&&
+      (prop.specifies_mode(FrameBufferProperties::FM_index)==false)&&
+      (prop.specifies_mode(FrameBufferProperties::FM_buffer)==false)&&
+      (prop.specifies_mode(FrameBufferProperties::FM_accum)==false)&&
+      (prop.specifies_mode(FrameBufferProperties::FM_stencil)==false)&&
+      (prop.specifies_mode(FrameBufferProperties::FM_multisample)==false)&&
       (prop.get_aux_rgba() == 0)&&
       (prop.get_aux_hrgba() == 0)&&
       (prop.get_aux_float() == 0)) {
diff --git a/panda/src/wgldisplay/wglGraphicsPipe.cxx b/panda/src/wgldisplay/wglGraphicsPipe.cxx
index 2626ac8539..518296ab7f 100644
--- a/panda/src/wgldisplay/wglGraphicsPipe.cxx
+++ b/panda/src/wgldisplay/wglGraphicsPipe.cxx
@@ -176,11 +176,11 @@ make_output(const string &name,
         (host==0)||
         ((flags&BF_require_parasite)!=0)||
         ((flags&BF_require_window)!=0)||
-        (properties.has_mode(FrameBufferProperties::FM_index))||
-        (properties.has_mode(FrameBufferProperties::FM_buffer))||
-        (properties.has_mode(FrameBufferProperties::FM_accum))||
-        (properties.has_mode(FrameBufferProperties::FM_stencil))||
-        (properties.has_mode(FrameBufferProperties::FM_multisample))) {
+        (properties.specifies_mode(FrameBufferProperties::FM_index))||
+        (properties.specifies_mode(FrameBufferProperties::FM_buffer))||
+        (properties.specifies_mode(FrameBufferProperties::FM_accum))||
+        (properties.specifies_mode(FrameBufferProperties::FM_stencil))||
+        (properties.specifies_mode(FrameBufferProperties::FM_multisample))) {
       return NULL;
     }
     if ((wglgsg != 0) &&