refactor: update PRNG & seed handling in platform adapters

Author: postspectacular

packages/adapter-editart/src/index.ts

@@ -25,7 +25,7 @@ const SUPPORTED_TYPES = ["choice", "range", "toggle", "weighted"];
 
 const {
 	math: { clamp, round, fit, mix },
-	prng: { defPRNG, sfc32 },
+	prng: { SFC32 },
 	utils: { isString, hashString },
 } = $genart;
 
@@ -48,6 +48,7 @@ export class EditArtAdapter implements PlatformAdapter {
 	protected _selectedParamIDs?: string[];
 	protected _cache: Record<string, string> = {};
 	protected _prng!: PRNG;
+	protected _seed!: string;
 	protected _screen: ScreenConfig;
 
 	constructor() {
@@ -112,6 +113,10 @@ export class EditArtAdapter implements PlatformAdapter {
 		return this._prng;
 	}
 
+	get seed() {
+		return this._seed;
+	}
+
 	configure(opts: Partial<EditArtAdapterOpts>) {
 		if (opts.params) {
 			if (opts.params.length > MAX_PARAMS) {
@@ -223,7 +228,8 @@ export class EditArtAdapter implements PlatformAdapter {
 		for (let i = 0; i < MAX_PARAMS; i++) {
 			seedStr += this._searchParams.get("m" + i) || "0.5";
 		}
-		this._prng = defPRNG(seedStr, hashString(seedStr), sfc32);
+		this._seed = seedStr;
+		this._prng = new SFC32(hashString(seedStr));
 	}
 
 	protected serializeParam(spec: Param<any>) {

packages/adapter-fxhash/src/index.ts

@@ -58,7 +58,7 @@ const UPDATE_MAP: Record<ParamUpdateBehavior, FxParam["update"]> = {
 };
 
 const {
-	prng: { defPRNG, sfc32 },
+	prng: { SFC32 },
 	utils: { equiv, isString, hashString },
 } = $genart;
 
@@ -172,10 +172,11 @@ export class FxhashAdapter implements PlatformAdapter {
 	}
 
 	get prng() {
-		return (
-			this._prng ||
-			(this._prng = defPRNG($fx.hash, hashString($fx.hash), sfc32))
-		);
+		return this._prng || (this._prng = new SFC32(hashString($fx.hash)));
+	}
+
+	get seed() {
+		return $fx.hash;
 	}
 
 	get collector() {

packages/adapter-layer/src/index.ts

@@ -43,7 +43,7 @@ const TYPE_MAP: Record<
 };
 
 const {
-	prng: { defPRNG, sfc32 },
+	prng: { SFC32 },
 	utils: { equiv, isString, parseUUID },
 } = $genart;
 
@@ -122,10 +122,11 @@ class LayerAdapter implements PlatformAdapter {
 	}
 
 	get prng() {
-		return (
-			this._prng ||
-			(this._prng = defPRNG($layer.uuid, parseUUID($layer.uuid), sfc32))
-		);
+		return this._prng || (this._prng = new SFC32(parseUUID($layer.uuid)));
+	}
+
+	get seed() {
+		return $layer.uuid;
 	}
 
 	async updateParam(id: string, _: Param<any>) {

packages/adapter-urlparams/src/index.ts

@@ -17,7 +17,7 @@ import { compressBytes, decompressBytes } from "./compress.js";
 
 const {
 	math: { clamp01, parseNum },
-	prng: { defPRNG, sfc32, randomBigInt },
+	prng: { SFC32, randomBigInt },
 	utils: { formatValuePrec, parseBigInt128, stringifyBigInt },
 } = $genart;
 
@@ -35,6 +35,7 @@ class URLParamsAdapter implements PlatformAdapter {
 	protected params: URLSearchParams;
 	protected cache: Record<string, string> = {};
 	protected _prng!: PRNG;
+	protected _seed!: string;
 	protected _screen: ScreenConfig;
 
 	constructor() {
@@ -116,6 +117,10 @@ class URLParamsAdapter implements PlatformAdapter {
 		return this._prng;
 	}
 
+	get seed() {
+		return this._seed;
+	}
+
 	augmentParams(params: ParamSpecs) {
 		const group = this.id;
 		return {
@@ -127,7 +132,7 @@ class URLParamsAdapter implements PlatformAdapter {
 				desc: "Manually defined seed value",
 				min: 0n,
 				max: MAX_SEED - 1n,
-				default: BigInt(this._prng.seed),
+				default: BigInt(this._seed),
 				update: "reload",
 			}),
 			[WIDTH]: $genart.params.range({
@@ -284,11 +289,8 @@ class URLParamsAdapter implements PlatformAdapter {
 	protected initPRNG() {
 		const seedParam = this.params.get(SEED);
 		const seed = seedParam ? BigInt(seedParam) : randomBigInt(MAX_SEED);
-		this._prng = defPRNG(
-			stringifyBigInt(seed),
-			parseBigInt128(seed),
-			sfc32
-		);
+		this._seed = stringifyBigInt(seed);
+		this._prng = new SFC32(parseBigInt128(seed));
 	}
 }