Grey out high quality depth of field when it's not supported by GPU

release/scripts/startup/bl_ui/properties_data_camera.py

@@ -188,12 +188,14 @@ class DATA_PT_camera_dof(CameraButtonsPanel, Panel):
         sub.active = (cam.dof_object is None)
         sub.prop(cam, "dof_distance", text="Distance")
 
+        hq_support = dof_options.is_hq_supported
         col = split.column(align=True)
         col.label("Viewport:")
-        col.prop(dof_options, "use_high_quality")
+        sub = col.column()
+        sub.active = hq_support
+        sub.prop(dof_options, "use_high_quality")
         col.prop(dof_options, "fstop")
-
-        if dof_options.use_high_quality:
+        if dof_options.use_high_quality and hq_support:
             col.prop(dof_options, "blades")