From 6945604492a1e09b05ce5de4aa2e6f67c37d39a6 Mon Sep 17 00:00:00 2001
From: "Unknown W. Brackets" <checkins@unknownbrackets.org>
Date: Thu, 20 Oct 2022 23:10:56 -0700
Subject: [PATCH] softgpu: Multiply prev normal by world matrix.

Even when it's not in the vertex data, we still must multiply by the world
matrix.  Fixes some lighting issues in Nayuta no Kiseki.
---
 GPU/Software/TransformUnit.cpp | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/GPU/Software/TransformUnit.cpp b/GPU/Software/TransformUnit.cpp
index ac52ef180f..043683b88c 100644
--- a/GPU/Software/TransformUnit.cpp
+++ b/GPU/Software/TransformUnit.cpp
@@ -411,11 +411,9 @@ ClipVertexData TransformUnit::ReadVertex(VertexReader &vreader, const TransformS
 		vertex.v.clipw = vertex.clippos.w;
 
 		Vec3<float> worldnormal;
-		if (vreader.hasNormal()) {
+		if (state.enableLighting || state.uvGenMode == GE_TEXMAP_ENVIRONMENT_MAP) {
 			worldnormal = TransformUnit::ModelToWorldNormal(normal);
 			worldnormal.NormalizeOr001();
-		} else {
-			worldnormal = Vec3<float>(0.0f, 0.0f, 1.0f);
 		}
 
 		// Time to generate some texture coords.  Lighting will handle shade mapping.