From d6a59be012908bd7324b07a0b3beea06c896a82e Mon Sep 17 00:00:00 2001
From: "Unknown W. Brackets" <checkins@unknownbrackets.org>
Date: Thu, 20 Oct 2022 23:09:48 -0700
Subject: [PATCH] softgpu: Respect negate normal flag without norm.

Per tests, Z is still negated even when using the previous normal value.
---
 GPU/Software/TransformUnit.cpp | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/GPU/Software/TransformUnit.cpp b/GPU/Software/TransformUnit.cpp
index fbbdcd3919..ac52ef180f 100644
--- a/GPU/Software/TransformUnit.cpp
+++ b/GPU/Software/TransformUnit.cpp
@@ -337,17 +337,12 @@ ClipVertexData TransformUnit::ReadVertex(VertexReader &vreader, const TransformS
 		vertex.v.texturecoords = lastTC;
 	}
 
-	Vec3f normal;
 	static Vec3f lastnormal;
-	if (vreader.hasNormal()) {
-		vreader.ReadNrm(normal.AsArray());
-		lastnormal = normal;
-
-		if (state.negateNormals)
-			normal = -normal;
-	} else {
-		normal = lastnormal;
-	}
+	if (vreader.hasNormal())
+		vreader.ReadNrm(lastnormal.AsArray());
+	Vec3f normal = lastnormal;
+	if (state.negateNormals)
+		normal = -normal;
 
 	if (state.readWeights) {
 		float W[8] = { 1.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f };