Add signal style flag to require realistic braking

docs/newgrf-additions-nml.html

@@ -535,6 +535,11 @@ item (FEAT_GLOBALVARS) {
 			Set whether signals should be drawn on the opposite side of the track for the most recently defined style (defined using the <span class="code">define_style</span> property).
 		</td>
 	</tr>
+	<tr><td>style_realistic_braking_only</td><td>0 or 1</td>
+		<td>
+			Set whether signals using this style may only be built when realistic braking is enabled, for the most recently defined style (defined using the <span class="code">define_style</span> property).
+		</td>
+	</tr>
 	<tr><td>no_default_style</td><td>0 or 1</td>
 		<td>
 			When enabled, custom signal graphics from this GRF are only used for custom signal styles, not the default style

docs/newgrf-additions.html

@@ -507,6 +507,13 @@
 	The Action 0 Id field is not used, the value is ignored.
 	</p>
 	<p>This is indicated by the feature name: <font face="monospace">action0_signals_style</font>, version 1</p>
+	<h4 id="signals_style_realistic_braking_only">Set custom signal style signal requires realistic braking (mappable property: signals_style_realistic_braking_only)</h4>
+	<p>This applies to the most recent custom signal style defined using the <a href="#signals_define_style">signals_define_style</a> property.<br />
+	When enabled, signals using this style may only be built when realistic braking is enabled.</p>
+	<p>The property length is 1 byte. 0 is disabled (default). 1 is enabled.<br />
+	The Action 0 Id field is not used, the value is ignored.
+	</p>
+	<p>This is indicated by the feature name: <font face="monospace">action0_signals_style</font>, version 1</p>
 	<h4 id="signals_no_default_style">Set whether custom signal sprites should not be used for the default signal style (mappable property: signals_no_default_style)</h4>
 	<p>This applies to <a href="#a3signals_custom_signal_sprites">Action 2/3 Signals (Feature 0E) custom signal sprites</a> for this GRF.<br />
 	When enabled, this GRF is not used for the default signal style, it is only used for custom signal styles defined with <a href="#signals_define_style">signals_define_style</a>.</p>

src/newgrf.cpp

@@ -4298,6 +4298,15 @@ static ChangeInfoResult SignalsChangeInfo(uint id, int numinfo, int prop, const
 				break;
 			}
 
+			case A0RPI_SIGNALS_STYLE_REALISTIC_BRAKING_ONLY: {
+				if (MappedPropertyLengthMismatch(buf, 1, mapping_entry)) break;
+				uint8 value = buf->ReadByte();
+				if (_cur.grffile->current_new_signal_style != nullptr) {
+					SB(_cur.grffile->current_new_signal_style->style_flags, NSSF_REALISTIC_BRAKING_ONLY, 1, (value != 0 ? 1 : 0));
+				}
+				break;
+			}
+
 			default:
 				ret = HandleAction0PropertyDefault(buf, prop);
 				break;

src/newgrf_extension.cpp

@@ -102,6 +102,7 @@ extern const GRFPropertyMapDefinition _grf_action0_remappable_properties[] = {
 	GRFPropertyMapDefinition(GSF_SIGNALS, A0RPI_SIGNALS_STYLE_ELECTRIC_ENABLED, "signals_style_electric_enabled"),
 	GRFPropertyMapDefinition(GSF_SIGNALS, A0RPI_SIGNALS_STYLE_OPPOSITE_SIDE, "signals_style_opposite_side"),
 	GRFPropertyMapDefinition(GSF_SIGNALS, A0RPI_SIGNALS_STYLE_COMBINED_NORMAL_SHUNT, "signals_style_combined_normal_shunt"),
+	GRFPropertyMapDefinition(GSF_SIGNALS, A0RPI_SIGNALS_STYLE_REALISTIC_BRAKING_ONLY, "signals_style_realistic_braking_only"),
 	GRFPropertyMapDefinition(GSF_OBJECTS, A0RPI_OBJECT_USE_LAND_GROUND, "object_use_land_ground"),
 	GRFPropertyMapDefinition(GSF_OBJECTS, A0RPI_OBJECT_EDGE_FOUNDATION_MODE, "object_edge_foundation_mode"),
 	GRFPropertyMapDefinition(GSF_OBJECTS, A0RPI_OBJECT_FLOOD_RESISTANT, "object_flood_resistant"),

src/newgrf_extension.h

@@ -46,6 +46,7 @@ enum Action0RemapPropertyIds {
 	A0RPI_SIGNALS_STYLE_ELECTRIC_ENABLED,
 	A0RPI_SIGNALS_STYLE_OPPOSITE_SIDE,
 	A0RPI_SIGNALS_STYLE_COMBINED_NORMAL_SHUNT,
+	A0RPI_SIGNALS_STYLE_REALISTIC_BRAKING_ONLY,
 	A0RPI_OBJECT_USE_LAND_GROUND,
 	A0RPI_OBJECT_EDGE_FOUNDATION_MODE,
 	A0RPI_OBJECT_FLOOD_RESISTANT,

src/newgrf_newsignals.cpp

@@ -21,6 +21,7 @@ std::vector<const GRFFile *> _new_signals_grfs;
 std::array<NewSignalStyle, MAX_NEW_SIGNAL_STYLES> _new_signal_styles;
 std::array<NewSignalStyleMapping, MAX_NEW_SIGNAL_STYLES> _new_signal_style_mapping;
 uint _num_new_signal_styles = 0;
+uint16 _enabled_new_signal_styles_mask = 0;
 
 /* virtual */ uint32 NewSignalsScopeResolver::GetRandomBits() const
 {

src/newgrf_newsignals.h

@@ -34,6 +34,7 @@ enum NewSignalStyleFlags {
 	NSSF_OPPOSITE_SIDE                  = 3,
 	NSSF_LOOKAHEAD_SINGLE_SIGNAL        = 4,
 	NSSF_COMBINED_NORMAL_SHUNT          = 5,
+	NSSF_REALISTIC_BRAKING_ONLY         = 6,
 };
 
 struct NewSignalStyle {
@@ -56,6 +57,7 @@ struct NewSignalStyleMapping {
 };
 extern std::array<NewSignalStyleMapping, MAX_NEW_SIGNAL_STYLES> _new_signal_style_mapping;
 extern uint _num_new_signal_styles;
+extern uint16 _enabled_new_signal_styles_mask;
 
 /** Resolver for the new signals scope. */
 struct NewSignalsScopeResolver : public ScopeResolver {

src/rail_cmd.cpp

@@ -1481,7 +1481,8 @@ CommandCost CmdBuildSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1,
 
 	uint which_signals = GB(p1, 9, 6);
 
-	uint signal_style = std::min<uint>(GB(p1, 19, 4), _num_new_signal_styles);
+	uint signal_style = GB(p1, 19, 4);
+	if (signal_style > _num_new_signal_styles || !HasBit(_enabled_new_signal_styles_mask, signal_style)) return CMD_ERROR;
 
 	if (_settings_game.vehicle.train_braking_model == TBM_REALISTIC && IsSignalTypeUnsuitableForRealisticBraking(sigtype)) return CMD_ERROR;
 

src/rail_gui.cpp

@@ -1876,7 +1876,7 @@ private:
 		this->realistic_braking_mode = (_settings_game.vehicle.train_braking_model == TBM_REALISTIC);
 		this->progsig_ui_shown = _settings_client.gui.show_progsig_ui;
 		this->noentry_ui_shown = _settings_client.gui.show_noentrysig_ui;
-		this->style_selector_shown = _num_new_signal_styles > 0;
+		this->style_selector_shown = _enabled_new_signal_styles_mask > 1;
 
 		bool show_norm = this->realistic_braking_mode || this->all_signal_mode;
 		bool show_presig = !this->realistic_braking_mode && this->all_signal_mode;
@@ -2106,8 +2106,10 @@ public:
 				DropDownList list;
 				list.emplace_back(new DropDownListStringItem(STR_BUILD_SIGNAL_DEFAULT_STYLE, 0, false));
 				for (uint i = 0; i < _num_new_signal_styles; i++) {
+					if (HasBit(_enabled_new_signal_styles_mask, i + 1)) {
 						list.emplace_back(new DropDownListStringItem(_new_signal_styles[i].name, i + 1, false));
 					}
+				}
 				ShowDropDownList(this, std::move(list), _cur_signal_style, widget);
 				break;
 			}
@@ -2148,12 +2150,12 @@ public:
 		this->SetWidgetDisabledState(WID_BS_DRAG_SIGNALS_DENSITY_DECREASE, _settings_client.gui.drag_signals_density == 1);
 		this->SetWidgetDisabledState(WID_BS_DRAG_SIGNALS_DENSITY_INCREASE, _settings_client.gui.drag_signals_density == 20);
 
-		if (_cur_signal_style > _num_new_signal_styles) _cur_signal_style = 0;
+		if (_cur_signal_style > _num_new_signal_styles || !HasBit(_enabled_new_signal_styles_mask, _cur_signal_style)) _cur_signal_style = 0;
 
 		if (this->all_signal_mode != (_settings_client.gui.signal_gui_mode == SIGNAL_GUI_ALL) || this->progsig_ui_shown != _settings_client.gui.show_progsig_ui ||
 				this->realistic_braking_mode != (_settings_game.vehicle.train_braking_model == TBM_REALISTIC) ||
 				this->noentry_ui_shown != _settings_client.gui.show_noentrysig_ui ||
-				this->style_selector_shown != (_num_new_signal_styles > 0)) {
+				this->style_selector_shown != (_enabled_new_signal_styles_mask > 1)) {
 			this->SetSignalUIMode();
 			this->ReInit();
 		}

src/signal.cpp

@@ -1707,6 +1707,8 @@ static bool DetermineExtraAspectsVariable()
 
 	_signal_style_masks = {};
 
+	_enabled_new_signal_styles_mask = 1;
+
 	if (_settings_game.vehicle.train_braking_model == TBM_REALISTIC) {
 		for (RailType r = RAILTYPE_BEGIN; r != RAILTYPE_END; r++) {
 			const RailtypeInfo *rti = GetRailTypeInfo(r);
@@ -1743,6 +1745,13 @@ static bool DetermineExtraAspectsVariable()
 			_new_signal_styles[i].electric_mask &= (1 << SIGTYPE_PBS) | (1 << SIGTYPE_PBS_ONEWAY) | (1 << SIGTYPE_NO_ENTRY);
 			_new_signal_styles[i].semaphore_mask &= (1 << SIGTYPE_PBS) | (1 << SIGTYPE_PBS_ONEWAY) | (1 << SIGTYPE_NO_ENTRY);
 		}
+		uint8 mask = 0xFF;
+		if (HasBit(_new_signal_styles[i].style_flags, NSSF_REALISTIC_BRAKING_ONLY) && _settings_game.vehicle.train_braking_model != TBM_REALISTIC) {
+			mask = 0;
+		} else if (_settings_game.vehicle.train_braking_model == TBM_REALISTIC) {
+			mask &= (1 << SIGTYPE_NORMAL) | (1 << SIGTYPE_PBS) | (1 << SIGTYPE_PBS_ONEWAY) | (1 << SIGTYPE_NO_ENTRY);
+		}
+		if ((_new_signal_styles[i].electric_mask | _new_signal_styles[i].semaphore_mask) & mask) SetBit(_enabled_new_signal_styles_mask, i + 1);
 	}
 	for (uint i = _num_new_signal_styles; i < MAX_NEW_SIGNAL_STYLES; i++) {
 		_new_signal_styles[i].lookahead_extra_aspects = new_extra_aspects;