From: Chris Duncan <chris@zoso.dev>
Date: Sat, 14 Dec 2024 10:02:38 +0000 (-0800)
Subject: Second attempt at parsing block hash from hex to uint LE.
X-Git-Url: https://zoso.dev/?a=commitdiff_plain;h=e720e0b94adc9cfe39e859223486c108de817d4a;p=libnemo.git

Second attempt at parsing block hash from hex to uint LE.
---

diff --git a/src/lib/workers/pow.ts b/src/lib/workers/pow.ts
index 2166806..5378f87 100644
--- a/src/lib/workers/pow.ts
+++ b/src/lib/workers/pow.ts
@@ -60,6 +60,23 @@ export class Pow {
 		}
 		return out
 	}
+
+	static processHash (hashHex: string): Uint32Array {
+		if (!/^[A-F-a-f0-9]{64}$/.test(hashHex)) {
+			throw new Error(`invalid_hash ${hashHex}`)
+		}
+		const view = new DataView(new ArrayBuffer(32))
+		for (let i = 0; i < view.byteLength; i += 2) {
+			const byte = hashHex.slice(i, i + 2)
+			view.setUint8(i / 2, parseInt(byte, 16))
+		}
+		let hashBytesLE: number[] = []
+		for (let i = 0; i < view.byteLength; i += 4) {
+			hashBytesLE.push(view.getUint32(i, true))
+		}
+		return new Uint32Array(hashBytesLE)
+	}
+
 	/*
 		for (i = 0; i<12; i++) {
 			B2B_G(0, 8, 16, 24, SIGMA82[i * 16 + 0], SIGMA82[i * 16 + 1]);
@@ -77,10 +94,9 @@ export class Pow {
 	static calculate (hashHex: string, threshold: number = this.SEND_THRESHOLD, callback: (nonce: string | PromiseLike<string>) => any): void {
 		if (typeof threshold !== 'number') throw new TypeError(`invalid_threshold ${threshold}`)
 		if (!/^[A-F-a-f0-9]{64}$/.test(hashHex)) throw new Error(`invalid_hash ${hashHex}`)
-		let reverseHex = ''
-		for (let i = hashHex.length; i > 0; i -= 2) reverseHex += hashHex.slice(i - 2, i)
 		if (this.gl == null) throw new Error('webgl2_required')
 		this.gl.clearColor(0, 0, 0, 1)
+		const blockHashComponents: Uint32Array = this.processHash(hashHex)
 
 		// Vertext Shader
 		const vsSource = `#version 300 es
@@ -109,6 +125,8 @@ export class Pow {
 		uniform uvec4 u_work0;
 		// Last 4 bytes remain as generated externally
 		uniform uvec4 u_work1;
+		// Precalculated block hash components
+		uniform uint blockHash[8];
 
 		// Defined separately from uint v[32] below as the original value is required
 		// to calculate the second uint32 of the digest for threshold comparison
@@ -311,6 +329,7 @@ export class Pow {
 
 		const work0Location = this.gl.getUniformLocation(program, 'u_work0')
 		const work1Location = this.gl.getUniformLocation(program, 'u_work1')
+		const blockHashLocation = this.gl.getUniformLocation(program, "blockHash")
 
 		// Draw output until success or progressCallback says to stop
 		let n = 0
@@ -324,6 +343,7 @@ export class Pow {
 
 			this.gl.uniform4uiv(work0Location, this.work0)
 			this.gl.uniform4uiv(work1Location, this.work1)
+			this.gl.uniform1uiv(blockHashLocation, blockHashComponents)
 
 			this.gl.clear(this.gl.COLOR_BUFFER_BIT)
 			this.gl.drawArrays(this.gl.TRIANGLES, 0, 6)