Add road stops flag to disable auto road connections

Bump road stops version

docs/newgrf-roadstops-nml.html

@@ -82,6 +82,8 @@
 			<span class="indent">Do not show catenary graphics. (This only takes effect from <span class="code">road_stops</span> version 2).</span></p>
 			<p><b>RST_GENERAL_FLAG_DRIVE_THROUGH_ONLY</b><br />
 			<span class="indent">Only allow drive-through stops (not bay stops). (This only takes effect from <span class="code">road_stops</span> version 2).</span></p>
+			<p><b>RST_GENERAL_FLAG_NO_AUTO_ROAD_CONNECTION</b><br />
+			<span class="indent">Do not automatically build connecting road pieces. (This only takes effect from <span class="code">road_stops</span> version 3).</span></p>
 		</td></tr>
 		<tr><td>minimum_bridge_height</td><td>Array of 6 items [0..255, ...]</td><td>Minimum clearances required for a bridge for each of the <a href="#roadstop_views">6 views/rotations</a> (or 0 to not allow any bridge). Values are given in height level units (1 level == 8px).</td></tr>
 		<tr><td>disallowed_bridge_pillars</td><td>Array of 6 items [bitmask(RST_BRIDGE_PILLAR_FLAG_, ...), ...]</td><td>

docs/newgrf-roadstops.html

@@ -150,8 +150,9 @@
 	<tr><th>Bit</th><th>Value</th><th>Meaning</th></tr>
 	<tr><td>0</td><td>1</td><td>Callback 141 needs random bits in variable 10</td></tr>
 	<tr><td>1</td><td>2</td><td>Do not show one way road overlay sprites, this should only be set if different graphics are provided for the different one-way states using bits 0..1 of variable 50.</td></tr>
-	<tr><td>2</td><td>4</td><td>Do not catenary graphics.</br>This requires <font face="monospace">road_stops</font>, version 2.</td></tr>
+	<tr><td>2</td><td>4</td><td>Do not show catenary graphics.</br>This requires <font face="monospace">road_stops</font>, version 2.</td></tr>
 	<tr><td>3</td><td>8</td><td>Only allow drive-through stops (not bay stops).</br>This requires <font face="monospace">road_stops</font>, version 2.</td></tr>
+	<tr><td>4</td><td>10</td><td>Do not automatically build connecting road pieces.</br>This requires <font face="monospace">road_stops</font>, version 3.</td></tr>
 	</table>
 	The default value is 0 (no flags enabled).
 	</p>

src/newgrf_extension.cpp

@@ -54,7 +54,7 @@ extern const GRFFeatureInfo _grf_feature_list[] = {
 	GRFFeatureInfo("action0_object_edge_foundation_mode", 2),
 	GRFFeatureInfo("action0_object_flood_resistant", 1),
 	GRFFeatureInfo("action0_object_viewport_map_tile_type", 1),
-	GRFFeatureInfo("road_stops", 2),
+	GRFFeatureInfo("road_stops", 3),
 	GRFFeatureInfo("new_landscape", 1),
 	GRFFeatureInfo(),
 };

src/newgrf_roadstop.h

@@ -68,6 +68,7 @@ enum RoadStopSpecFlags {
 	RSF_NO_ONE_WAY_OVERLAY,   ///< Do not show one-way road overlays.
 	RSF_NO_CATENARY,          ///< Do not show catenary.
 	RSF_DRIVE_THROUGH_ONLY,   ///< Stop is drive-through only.
+	RSF_NO_AUTO_ROAD_CONNECTION, ///< No auto road connection.
 };
 
 enum RoadStopSpecIntlFlags {

src/road_gui.cpp

@@ -199,11 +199,23 @@ void CcRoadStop(const CommandCost &result, TileIndex tile, uint32 p1, uint32 p2,
 	DiagDirection dir = (DiagDirection)GB(p2, 3, 2);
 	if (_settings_client.sound.confirm) SndPlayTileFx(SND_1F_CONSTRUCTION_OTHER, tile);
 	if (!_settings_client.gui.persistent_buildingtools) ResetObjectToPlace();
-	TileArea roadstop_area(tile, GB(p1, 0, 8), GB(p1, 8, 8));
-	for (TileIndex cur_tile : roadstop_area) {
-		ConnectRoadToStructure(cur_tile, dir);
-		/* For a drive-through road stop build connecting road for other entrance. */
-		if (HasBit(p2, 1)) ConnectRoadToStructure(cur_tile, ReverseDiagDir(dir));
+
+	bool connect_to_road = true;
+
+	RoadStopClassID spec_class = Extract<RoadStopClassID, 0, 8>(p3);
+	byte spec_index            = GB(p3, 8, 8);
+	if ((uint)spec_class < RoadStopClass::GetClassCount() && spec_index < RoadStopClass::Get(spec_class)->GetSpecCount()) {
+		const RoadStopSpec *roadstopspec = RoadStopClass::Get(spec_class)->GetSpec(spec_index);
+		if (roadstopspec != nullptr && HasBit(roadstopspec->flags, RSF_NO_AUTO_ROAD_CONNECTION)) connect_to_road = false;
+	}
+
+	if (connect_to_road) {
+		TileArea roadstop_area(tile, GB(p1, 0, 8), GB(p1, 8, 8));
+		for (TileIndex cur_tile : roadstop_area) {
+			ConnectRoadToStructure(cur_tile, dir);
+			/* For a drive-through road stop build connecting road for other entrance. */
+			if (HasBit(p2, 1)) ConnectRoadToStructure(cur_tile, ReverseDiagDir(dir));
+		}
 	}
 }