From 4961a2af79b7050944ffd606731efb8dc83480b8 Mon Sep 17 00:00:00 2001
From: FalsePattern <30945458+FalsePattern@users.noreply.github.com>
Date: Wed, 19 Jan 2022 14:32:16 +0100
Subject: [PATCH] Use different triangle vertex order permutations, cutting
 down overhead on the array manipulation logic

---
 .../mixin/mixins/client/TessellatorMixin.java  | 18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)

diff --git a/src/main/java/com/falsepattern/triangulator/mixin/mixins/client/TessellatorMixin.java b/src/main/java/com/falsepattern/triangulator/mixin/mixins/client/TessellatorMixin.java
index 5fb2b6ee..7901ca59 100644
--- a/src/main/java/com/falsepattern/triangulator/mixin/mixins/client/TessellatorMixin.java
+++ b/src/main/java/com/falsepattern/triangulator/mixin/mixins/client/TessellatorMixin.java
@@ -81,19 +81,15 @@ private void hackVertex(CallbackInfo ci) {
             }
             //Current vertex layout: ABCD
             if (alternativeTriangulation) {
-                //Target vertex layout: BCDBDA
-                System.arraycopy(rawBuffer, rawBufferIndex - 32, rawBuffer, rawBufferIndex + 8, 8);
-                System.arraycopy(rawBuffer, rawBufferIndex - 8, rawBuffer, rawBufferIndex, 8);
-                System.arraycopy(rawBuffer, rawBufferIndex - 24, rawBuffer, rawBufferIndex - 8, 8);
-                System.arraycopy(rawBuffer, rawBufferIndex - 24, rawBuffer, rawBufferIndex - 32, 8);
-                System.arraycopy(rawBuffer, rawBufferIndex - 16, rawBuffer, rawBufferIndex - 24, 8);
-                System.arraycopy(rawBuffer, rawBufferIndex, rawBuffer, rawBufferIndex - 16, 8);
+                //Target vertex layout: ABD DBC
+                System.arraycopy(rawBuffer, rawBufferIndex - 16, rawBuffer, rawBufferIndex + 8, 8);
+                System.arraycopy(rawBuffer, rawBufferIndex - 24, rawBuffer, rawBufferIndex, 8);
+                System.arraycopy(rawBuffer, rawBufferIndex - 8, rawBuffer, rawBufferIndex - 16, 8);
                 alternativeTriangulation = false;
             } else {
-                //Target vertex layout: ABCACD
-                System.arraycopy(rawBuffer, rawBufferIndex - 8, rawBuffer, rawBufferIndex + 8, 8);
-                System.arraycopy(rawBuffer, rawBufferIndex - 16, rawBuffer, rawBufferIndex, 8);
-                System.arraycopy(rawBuffer, rawBufferIndex - 32, rawBuffer, rawBufferIndex - 8, 8);
+                //Target vertex layout: ABC DAC
+                System.arraycopy(rawBuffer, rawBufferIndex - 32, rawBuffer, rawBufferIndex, 8);
+                System.arraycopy(rawBuffer, rawBufferIndex - 16, rawBuffer, rawBufferIndex + 8, 8);
             }
             vertexCount += 2;
             rawBufferIndex += 16;