From: Chris Duncan <chris@zoso.dev>
Date: Thu, 12 Dec 2024 17:17:50 +0000 (-0800)
Subject: Eliminate an allocation by making work arrays static since they are randomized on... 
X-Git-Url: https://zoso.dev/?a=commitdiff_plain;h=8bc4d95be99a1996092b5bbfe629ddd89963c6b3;p=libnemo.git

Eliminate an allocation by making work arrays static since they are randomized on every draw call anyway.
---

diff --git a/src/lib/workers/pow.ts b/src/lib/workers/pow.ts
index ad26e33..ff48dd9 100644
--- a/src/lib/workers/pow.ts
+++ b/src/lib/workers/pow.ts
@@ -32,6 +32,8 @@ export class Pow {
 	static webglWidth = 256 * 4
 	static webglHeight = 256 * 4
 	static gl = new OffscreenCanvas(this.webglWidth, this.webglHeight).getContext('webgl2')
+	static work0 = new Uint8Array(4)
+	static work1 = new Uint8Array(4)
 
 	static hexify (arr: number[] | Uint8Array): string {
 		let out = ''
@@ -290,17 +292,15 @@ export class Pow {
 		const work1Location = this.gl.getUniformLocation(program, 'u_work1')
 
 		// Draw output until success or progressCallback says to stop
-		const work0 = new Uint8Array(4)
-		const work1 = new Uint8Array(4)
 
 		const draw = (): void => {
 			if (this.gl == null) throw new Error('webgl2_required')
 			const start = performance.now()
-			crypto.getRandomValues(work0)
-			crypto.getRandomValues(work1)
+			crypto.getRandomValues(this.work0)
+			crypto.getRandomValues(this.work1)
 
-			this.gl.uniform4uiv(work0Location, work0)
-			this.gl.uniform4uiv(work1Location, work1)
+			this.gl.uniform4uiv(work0Location, this.work0)
+			this.gl.uniform4uiv(work1Location, this.work1)
 
 			this.gl.clear(this.gl.COLOR_BUFFER_BIT)
 			this.gl.drawArrays(this.gl.TRIANGLES, 0, 6)
@@ -316,11 +316,11 @@ export class Pow {
 					console.log(`frame time: ${performance.now() - start}`)
 					// Return the work value with the custom bits
 					typeof callback === 'function' &&
-						callback(this.hexify(work1) + this.hexify([
+						callback(this.hexify(this.work1) + this.hexify([
 							pixels[i + 2],
 							pixels[i + 3],
-							work0[2] ^ (pixels[i] - 1),
-							work0[3] ^ (pixels[i + 1] - 1)
+							this.work0[2] ^ (pixels[i] - 1),
+							this.work0[3] ^ (pixels[i + 1] - 1)
 						]))
 					return
 				}