From 34d109602e57899ea998264b48578974c85ab4bc Mon Sep 17 00:00:00 2001
From: Chris Duncan <chris@zoso.dev>
Date: Tue, 17 Dec 2024 06:00:18 -0800
Subject: [PATCH] Make pixel array static so it can be allocated once and
 reused.

---
 src/lib/workers/pow.ts | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/src/lib/workers/pow.ts b/src/lib/workers/pow.ts
index 4c4204f..8f05539 100644
--- a/src/lib/workers/pow.ts
+++ b/src/lib/workers/pow.ts
@@ -222,6 +222,7 @@ void main() {
 	static #fragmentShader: WebGLShader | null
 	static #positionBuffer: WebGLBuffer | null
 	static #uvBuffer: WebGLBuffer | null
+	static #pixels: Uint8Array
 	// Vertex Positions, 2 triangles
 	static #positions = new Float32Array([
 		-1, -1, 0, -1, 1, 0, 1, 1, 0,
@@ -282,6 +283,7 @@ void main() {
 		this.#blockHashLocation = this.#gl.getUniformLocation(this.#program, "blockHash")
 		this.#thresholdLocation = this.#gl.getUniformLocation(this.#program, "threshold")
 		this.#workloadLocation = this.#gl.getUniformLocation(this.#program, "workload")
+		this.#pixels = new Uint8Array(this.#gl.drawingBufferWidth * this.#gl.drawingBufferHeight * 4)
 	}
 
 	static #calculate (hashHex: string, callback: (nonce: string | PromiseLike<string>) => any, threshold: number): void {
@@ -318,21 +320,20 @@ void main() {
 
 			Pow.#gl.clear(Pow.#gl.COLOR_BUFFER_BIT)
 			Pow.#gl.drawArrays(Pow.#gl.TRIANGLES, 0, 6)
-			const pixels = new Uint8Array(Pow.#gl.drawingBufferWidth * Pow.#gl.drawingBufferHeight * 4)
-			Pow.#gl.readPixels(0, 0, Pow.#gl.drawingBufferWidth, Pow.#gl.drawingBufferHeight, Pow.#gl.RGBA, Pow.#gl.UNSIGNED_BYTE, pixels)
+			Pow.#gl.readPixels(0, 0, Pow.#gl.drawingBufferWidth, Pow.#gl.drawingBufferHeight, Pow.#gl.RGBA, Pow.#gl.UNSIGNED_BYTE, Pow.#pixels)
 			// Check the pixels for any success
-			for (let i = 0; i < pixels.length; i += 4) {
-				if (pixels[i] !== 0) {
+			for (let i = 0; i < Pow.#pixels.length; i += 4) {
+				if (Pow.#pixels[i] !== 0) {
 					performance.mark('end')
 					frameTimes.push(performance.measure('draw', 'start', 'end').duration)
 					performance.clearMarks()
 					console.log(`average frame time: ${(frameTimes.reduce((a, b) => a + b)) / frameTimes.length} ms`)
 					console.log(`frames calculated: ${n}`)
 					const hex = this.#hexify(work1) + this.#hexify([
-						pixels[i + 2],
-						pixels[i + 3],
-						work0[2] ^ (pixels[i] - 1),
-						work0[3] ^ (pixels[i + 1] - 1)
+						Pow.#pixels[i + 2],
+						Pow.#pixels[i + 3],
+						work0[2] ^ (Pow.#pixels[i] - 1),
+						work0[3] ^ (Pow.#pixels[i + 1] - 1)
 					])
 					// Return the work value with the custom bits
 					typeof callback === 'function' && callback(hex)
-- 
2.34.1