Add setting and town override for whether towns can build bridges

src/lang/english.txt

@@ -2199,6 +2199,9 @@ STR_CONFIG_SETTING_TOWN_MAX_ROAD_SLOPE_HELPTEXT                 :Limit the lengt
 STR_CONFIG_SETTING_TOWN_MAX_ROAD_SLOPE_VALUE                    :{NUM} tile{P "" s}
 STR_CONFIG_SETTING_TOWN_MAX_ROAD_SLOPE_ZERO                     :No limit
 
+STR_CONFIG_SETTING_ALLOW_TOWN_BRIDGES                           :Towns are allowed to build bridges: {STRING2}
+STR_CONFIG_SETTING_ALLOW_TOWN_BRIDGES_HELPTEXT                  :Enabling this setting allows towns to build bridges
+
 STR_CONFIG_SETTING_NOISE_LEVEL                                  :Allow town controlled noise level for airports: {STRING2}
 STR_CONFIG_SETTING_NOISE_LEVEL_HELPTEXT                         :With this setting disabled, there can be two airports in each town. With this setting enabled, the number of airports in a town is limited by the noise acceptance of the town, which depends on population and airport size and distance
 
@@ -4521,12 +4524,13 @@ STR_LOCAL_AUTHORITY_ACTION_TOOLTIP_NEW_BUILDINGS                :{YELLOW}Fund th
 STR_LOCAL_AUTHORITY_ACTION_TOOLTIP_EXCLUSIVE_TRANSPORT          :{YELLOW}Buy 1 year's exclusive transport rights in town.{}Town authority will not allow passengers and cargo to use your competitors' stations.{}Cost: {CURRENCY_LONG}
 STR_LOCAL_AUTHORITY_ACTION_TOOLTIP_BRIBE                        :{YELLOW}Bribe the local authority to increase your rating, at the risk of a severe penalty if caught.{}Cost: {CURRENCY_LONG}
 
-###length 5
+###length 6
 STR_LOCAL_AUTHORITY_SETTING_OVERRIDE_ALLOW_ROADS                :Allowed to build roads
 STR_LOCAL_AUTHORITY_SETTING_OVERRIDE_ALLOW_LEVEL_CROSSINGS      :Allowed to build level crossings
 STR_LOCAL_AUTHORITY_SETTING_OVERRIDE_TUNNELS                    :Allowed to build tunnels
 STR_LOCAL_AUTHORITY_SETTING_OVERRIDE_MAX_ROAD_SLOPE             :Limit building continuous inclined roads
 STR_LOCAL_AUTHORITY_SETTING_OVERRIDE_TOWN_GROWTH                :Town growth speed
+STR_LOCAL_AUTHORITY_SETTING_OVERRIDE_BRIDGES                    :Allowed to build bridges
 
 STR_LOCAL_AUTHORITY_SETTING_OVERRIDE_DEFAULT                    :Default ({STRING1})
 STR_LOCAL_AUTHORITY_SETTING_OVERRIDE_STR                        :{STRING}: {PUSH_COLOUR}{YELLOW}{STRING2}{POP_COLOUR}

src/settings_gui.cpp

@@ -2233,6 +2233,7 @@ static SettingsContainer &GetSettingsTree()
 				towns->Add(new SettingEntry("economy.town_zone_calc_mode"));
 				towns->Add(new SettingEntry("economy.allow_town_roads"));
 				towns->Add(new SettingEntry("economy.allow_town_level_crossings"));
+				towns->Add(new SettingEntry("economy.allow_town_bridges"));
 				towns->Add(new SettingEntry("economy.town_build_tunnels"));
 				towns->Add(new SettingEntry("economy.town_max_road_slope"));
 				towns->Add(new SettingEntry("economy.found_town"));

src/settings_type.h

@@ -695,6 +695,7 @@ struct EconomySettings {
 	bool   allow_town_level_crossings;       ///< towns are allowed to build level crossings
 	TownTunnelMode town_build_tunnels;       ///< if/when towns are allowed to build road tunnels
 	uint8  town_max_road_slope;              ///< maximum number of consecutive sloped road tiles which towns are allowed to build
+	bool   allow_town_bridges;               ///< towns are allowed to build bridges
 	int8   old_town_cargo_factor;            ///< old power-of-two multiplier for town (passenger, mail) generation. May be negative.
 	int16  town_cargo_scale_factor;          ///< scaled power-of-two multiplier for town (passenger, mail) generation. May be negative.
 	int16  industry_cargo_scale_factor;      ///< scaled power-of-two multiplier for primary industry generation. May be negative.

src/table/settings/settings.ini

@@ -993,6 +993,14 @@ strval   = STR_CONFIG_SETTING_TOWN_MAX_ROAD_SLOPE_VALUE
 cat      = SC_BASIC
 patxname = ""economy.town_max_road_slope""
 
+[SDT_BOOL]
+var      = economy.allow_town_bridges
+def      = true
+str      = STR_CONFIG_SETTING_ALLOW_TOWN_BRIDGES
+strhelp  = STR_CONFIG_SETTING_ALLOW_TOWN_BRIDGES_HELPTEXT
+cat      = SC_BASIC
+patxname = ""economy.allow_town_bridges""
+
 [SDT_XREF]
 xref     = ""economy.old_town_cargo_factor""
 extver   = SlXvFeatureTest(XSLFTO_AND, XSLFI_CHILLPP)

src/town.h

@@ -66,6 +66,7 @@ enum TownSettingOverrideFlags {
 	TSOF_OVERRIDE_BUILD_TUNNELS             = 2,
 	TSOF_OVERRIDE_BUILD_INCLINED_ROADS      = 3,
 	TSOF_OVERRIDE_GROWTH                    = 4,
+	TSOF_OVERRIDE_BUILD_BRIDGES             = 5,
 };
 
 /** Town data structure. */
@@ -203,6 +204,11 @@ struct Town : TownPool::PoolItem<&_town_pool> {
 		return HasBit(this->override_flags, TSOF_OVERRIDE_BUILD_LEVEL_CROSSINGS) ? HasBit(this->override_values, TSOF_OVERRIDE_BUILD_LEVEL_CROSSINGS) : _settings_game.economy.allow_town_level_crossings;
 	}
 
+	inline bool GetAllowBuildBridges() const
+	{
+		return HasBit(this->override_flags, TSOF_OVERRIDE_BUILD_BRIDGES) ? HasBit(this->override_values, TSOF_OVERRIDE_BUILD_BRIDGES) : _settings_game.economy.allow_town_bridges;
+	}
+
 	inline TownTunnelMode GetBuildTunnelMode() const
 	{
 		return HasBit(this->override_flags, TSOF_OVERRIDE_BUILD_TUNNELS) ? this->build_tunnels : _settings_game.economy.town_build_tunnels;

src/town_cmd.cpp

@@ -1352,6 +1352,8 @@ static bool GrowTownWithBridge(const Town *t, const TileIndex tile, const DiagDi
 {
 	assert(bridge_dir < DIAGDIR_END);
 
+	if (!t->GetAllowBuildBridges()) return false;
+
 	const Slope slope = GetTileSlope(tile);
 
 	/* Make sure the direction is compatible with the slope.
@@ -3828,6 +3830,7 @@ CommandCost CmdOverrideTownSetting(TileIndex tile, DoCommandFlag flags, uint32 p
 			break;
 		case TSOF_OVERRIDE_BUILD_ROADS:
 		case TSOF_OVERRIDE_BUILD_LEVEL_CROSSINGS:
+		case TSOF_OVERRIDE_BUILD_BRIDGES:
 			if (is_override && value != 0 && value != 1) return CMD_ERROR;
 			break;
 		case TSOF_OVERRIDE_BUILD_TUNNELS:
@@ -3848,6 +3851,7 @@ CommandCost CmdOverrideTownSetting(TileIndex tile, DoCommandFlag flags, uint32 p
 					break;
 				case TSOF_OVERRIDE_BUILD_ROADS:
 				case TSOF_OVERRIDE_BUILD_LEVEL_CROSSINGS:
+				case TSOF_OVERRIDE_BUILD_BRIDGES:
 					SB(t->override_values, setting, 1, value & 1);
 					break;
 				case TSOF_OVERRIDE_BUILD_TUNNELS:

src/town_gui.cpp

@@ -113,7 +113,7 @@ private:
 				!(_local_company != COMPANY_SPECTATOR && _settings_game.difficulty.override_town_settings_in_multiplayer);
 	}
 
-	static const uint SETTING_OVERRIDE_COUNT = 5;
+	static const uint SETTING_OVERRIDE_COUNT = 6;
 
 public:
 	TownAuthorityWindow(WindowDesc *desc, WindowNumber window_number) : Window(desc), sel_index(-1), displayed_actions_on_previous_painting(0)
@@ -219,6 +219,7 @@ public:
 					switch (idx) {
 						case TSOF_OVERRIDE_BUILD_ROADS:
 						case TSOF_OVERRIDE_BUILD_LEVEL_CROSSINGS:
+						case TSOF_OVERRIDE_BUILD_BRIDGES:
 							SetDParam(0, HasBit(this->town->override_values, idx) ? STR_CONFIG_SETTING_ON : STR_CONFIG_SETTING_OFF);
 							break;
 						case TSOF_OVERRIDE_BUILD_TUNNELS:
@@ -261,6 +262,9 @@ public:
 							case TSOF_OVERRIDE_GROWTH:
 								SetDParam(1, STR_CONFIG_SETTING_TOWN_GROWTH_HELPTEXT);
 								break;
+							case TSOF_OVERRIDE_BUILD_BRIDGES:
+								SetDParam(1, STR_CONFIG_SETTING_ALLOW_TOWN_BRIDGES_HELPTEXT);
+								break;
 						}
 						text = STR_LOCAL_AUTHORITY_SETTING_OVERRIDE_TEXT;
 						SetDParam(0, STR_LOCAL_AUTHORITY_SETTING_OVERRIDE_ALLOW_ROADS + this->sel_index - 0x100);
@@ -324,6 +328,10 @@ public:
 							case TSOF_OVERRIDE_GROWTH:
 								SetDParam(1, overriden ? STR_CONFIG_SETTING_TOWN_GROWTH_NONE : STR_COLOUR_DEFAULT);
 								break;
+
+							case TSOF_OVERRIDE_BUILD_BRIDGES:
+								SetDParam(2, this->town->GetAllowBuildBridges() ? STR_CONFIG_SETTING_ON : STR_CONFIG_SETTING_OFF);
+								break;
 						}
 						DrawString(ir.left, ir.right, y,
 								STR_LOCAL_AUTHORITY_SETTING_OVERRIDE_STR, tc);
@@ -411,7 +419,8 @@ public:
 				uint8 idx = this->sel_index - 0x100;
 				switch (idx) {
 					case TSOF_OVERRIDE_BUILD_ROADS:
-					case TSOF_OVERRIDE_BUILD_LEVEL_CROSSINGS: {
+					case TSOF_OVERRIDE_BUILD_LEVEL_CROSSINGS:
+					case TSOF_OVERRIDE_BUILD_BRIDGES: {
 						int value = HasBit(this->town->override_flags, idx) ? (HasBit(this->town->override_values, idx) ? 2 : 1) : 0;
 						const StringID names[] = {
 							STR_COLOUR_DEFAULT,