Warn user if unsupported vehicle or element used

data/language/en-GB.txt

@@ -3604,6 +3604,8 @@ STR_6495    :Group rides by ride types instead of showing each vehicle separatel
 STR_6496    :{WINDOW_COLOUR_2}{STRINGID}
 STR_6497    :Click on a tile to show its tile elements.{NEWLINE}Ctrl + click a tile element to select it directly.
 STR_6498    :Enable to maintain square map shape.
+STR_6499    :Vehicle type not supported by track design format
+STR_6500    :Track elements not supported by track design format
 
 #############
 # Scenarios #

distribution/changelog.txt

@@ -1,4 +1,6 @@
 0.4.2 (in development)
+------------------------------------------------------------------------
+- Change: [#17499] Update error text when using vehicle incompatible with TD6 and add error when using incompatible track elements.
 
 0.4.1 (2022-07-04)
 ------------------------------------------------------------------------

src/openrct2/localisation/StringIds.h

@@ -3877,6 +3877,9 @@ enum : uint16_t
 
     STR_MAINTAIN_SQUARE_MAP_TOOLTIP = 6498,
 
+    STR_VEHICLE_UNSUPPORTED_TD6 = 6499,
+    STR_TRACK_ELEM_UNSUPPORTED_TD6 = 6500,
+
     // Have to include resource strings (from scenarios and objects) for the time being now that language is partially working
     /* MAX_STR_COUNT = 32768 */ // MAX_STR_COUNT - upper limit for number of strings, not the current count strings
 };

src/openrct2/ride/Track.h

@@ -526,6 +526,7 @@ namespace TrackElemType
     constexpr track_type_t FlatTrack1x1B_Alias = 121;
     constexpr track_type_t FlatTrack1x4C_Alias = 122;
     constexpr track_type_t FlatTrack3x3_Alias = 123;
+    constexpr track_type_t HighestAlias = 266;
 }; // namespace TrackElemType
 
 enum

src/openrct2/ride/TrackDesign.cpp

@@ -87,10 +87,10 @@ rct_string_id TrackDesign::CreateTrackDesign(TrackDesignState& tds, const Ride&
     if (object != nullptr)
     {
         auto entry = object->GetObjectEntry();
+        // Remove this check for new track design format
         if (entry.IsEmpty())
         {
-            // TODO create a new error message for `JSON objects are unsupported`
-            return STR_UNKNOWN_OBJECT_TYPE;
+            return STR_VEHICLE_UNSUPPORTED_TD6;
         }
         vehicle_object = ObjectEntryDescriptor(entry);
     }
@@ -199,6 +199,12 @@ rct_string_id TrackDesign::CreateTrackDesignTrack(TrackDesignState& tds, const R
 
     do
     {
+        // Remove this check for new track design format
+        if (trackElement.element->AsTrack()->GetTrackType() > TrackElemType::HighestAlias)
+        {
+            return STR_TRACK_ELEM_UNSUPPORTED_TD6;
+        }
+
         TrackDesignTrackElement track{};
         track.type = trackElement.element->AsTrack()->GetTrackType();