Add transistor building (Gate)

src/js/game/buildings/logic_gate.js

@@ -10,6 +10,7 @@ export const enumLogicGateVariants = {
     not: "not",
     xor: "xor",
     or: "or",
+    transistor: "transistor",
 };
 
 /** @enum {string} */
@@ -18,6 +19,7 @@ export const enumVariantToGate = {
     [enumLogicGateVariants.not]: enumLogicGateType.not,
     [enumLogicGateVariants.xor]: enumLogicGateType.xor,
     [enumLogicGateVariants.or]: enumLogicGateType.or,
+    [enumLogicGateVariants.transistor]: enumLogicGateType.transistor,
 };
 
 export class MetaLogicGateBuilding extends MetaBuilding {
@@ -51,6 +53,7 @@ export class MetaLogicGateBuilding extends MetaBuilding {
             enumLogicGateVariants.not,
             enumLogicGateVariants.xor,
             enumLogicGateVariants.or,
+            enumLogicGateVariants.transistor,
         ];
     }
 
@@ -88,6 +91,26 @@ export class MetaLogicGateBuilding extends MetaBuilding {
                 ]);
                 break;
             }
+            case enumLogicGateType.transistor: {
+                pinComp.setSlots([
+                    {
+                        pos: new Vector(0, 0),
+                        direction: enumDirection.top,
+                        type: enumPinSlotType.logicalEjector,
+                    },
+                    {
+                        pos: new Vector(0, 0),
+                        direction: enumDirection.left,
+                        type: enumPinSlotType.logicalAcceptor,
+                    },
+                    {
+                        pos: new Vector(0, 0),
+                        direction: enumDirection.bottom,
+                        type: enumPinSlotType.logicalAcceptor,
+                    },
+                ]);
+                break;
+            }
 
             case enumLogicGateType.not: {
                 pinComp.setSlots([

src/js/game/components/logic_gate.js

@@ -6,6 +6,7 @@ export const enumLogicGateType = {
     not: "not",
     xor: "xor",
     or: "or",
+    transistor: "transistor",
 };
 
 export class LogicGateComponent extends Component {

src/js/game/meta_building_registry.js

@@ -102,6 +102,7 @@ export function initMetaBuildingRegistry() {
     registerBuildingVariant(34, MetaLogicGateBuilding, enumLogicGateVariants.not);
     registerBuildingVariant(35, MetaLogicGateBuilding, enumLogicGateVariants.xor);
     registerBuildingVariant(36, MetaLogicGateBuilding, enumLogicGateVariants.or);
+    registerBuildingVariant(38, MetaLogicGateBuilding, enumLogicGateVariants.transistor);
 
     // Lever
     registerBuildingVariant(33, MetaLeverBuilding);

src/js/game/systems/logic_gate.js

@@ -3,6 +3,7 @@ import { GameSystemWithFilter } from "../game_system_with_filter";
 import { BaseItem, enumItemType } from "../base_item";
 import { enumPinSlotType } from "../components/wired_pins";
 import { BOOL_TRUE_SINGLETON, BOOL_FALSE_SINGLETON, BooleanItem } from "../items/boolean_item";
+import { enumItemProcessorTypes } from "../components/item_processor";
 
 export class LogicGateSystem extends GameSystemWithFilter {
     constructor(root) {
@@ -13,6 +14,7 @@ export class LogicGateSystem extends GameSystemWithFilter {
             [enumLogicGateType.not]: this.compute_NOT.bind(this),
             [enumLogicGateType.xor]: this.compute_XOR.bind(this),
             [enumLogicGateType.or]: this.compute_OR.bind(this),
+            [enumLogicGateType.transistor]: this.compute_IF.bind(this),
         };
     }
 
@@ -157,4 +159,31 @@ export class LogicGateSystem extends GameSystemWithFilter {
 
         return BOOL_FALSE_SINGLETON;
     }
+
+    /**
+     * @param {Array<BaseItem|null>} parameters
+     * @returns {BaseItem}
+     */
+    compute_IF(parameters) {
+        assert(parameters.length === 2, "bad parameter count for IF");
+
+        const flag = parameters[0];
+        const value = parameters[1];
+        if (!flag || !value) {
+            // Not enough params
+            return null;
+        }
+
+        if (flag.getItemType() !== enumItemType.boolean) {
+            // Flag is not a boolean
+            return null;
+        }
+
+        // pass through item
+        if (/** @type {BooleanItem} */ (flag).value) {
+            return value;
+        }
+
+        return null;
+    }
 }

translations/base-en.yaml

@@ -574,6 +574,10 @@ buildings:
             name: OR
             description: Emits a truthy signal if one of the inputs is truthy.
 
+        transistor:
+            name: Gate
+            description: Only forwards the bottom input if the left input is true.
+
     filter:
         default:
             name: &filter Filter