From 0514528a4c8a2d7ce1a2b4c3e0f5da94f8317727 Mon Sep 17 00:00:00 2001
From: mcrcortex <18544518+MCRcortex@users.noreply.github.com>
Date: Sun, 20 Jul 2025 18:42:11 +1000
Subject: [PATCH] attempted micro optimization of memcpy writer

---
 src/main/resources/assets/voxy/shaders/util/memcpy.comp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/main/resources/assets/voxy/shaders/util/memcpy.comp b/src/main/resources/assets/voxy/shaders/util/memcpy.comp
index a5904f2e..3cf55d9d 100644
--- a/src/main/resources/assets/voxy/shaders/util/memcpy.comp
+++ b/src/main/resources/assets/voxy/shaders/util/memcpy.comp
@@ -22,7 +22,10 @@ void main() {
     uint dst = job.y;
     uint siz = job.z;
 
-    for (uint i = gl_LocalInvocationID.x; i < siz; i+=WORK_SIZE) {
-        outputBuffer[dst+i] = dataInBuffer[src+i];
+    uint workPerThread = (siz+255)>>8;
+    uint start = gl_LocalInvocationID.x*workPerThread+src;
+    uint diff = dst-src;
+    for (uint i = start; i < min(start+workPerThread,siz+src); i++) {
+        outputBuffer[i+diff] = dataInBuffer[i];
     }
 }
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