From 0c29bce3d856f0526d5af23105ef7e79736128e0 Mon Sep 17 00:00:00 2001
From: SirLynix <lynix680@gmail.com>
Date: Mon, 4 Dec 2023 09:46:31 +0100
Subject: [PATCH] Utility/SubMesh: Allow tangent generation with 3D texcoords

---
 src/Nazara/Utility/SubMesh.cpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/Nazara/Utility/SubMesh.cpp b/src/Nazara/Utility/SubMesh.cpp
index 17816f157..d97fa45d3 100644
--- a/src/Nazara/Utility/SubMesh.cpp
+++ b/src/Nazara/Utility/SubMesh.cpp
@@ -61,6 +61,13 @@ namespace Nz
 		SparsePtr<Vector3f> positions = mapper.GetComponentPtr<Vector3f>(VertexComponent::Position);
 		SparsePtr<Vector3f> tangents = mapper.GetComponentPtr<Vector3f>(VertexComponent::Tangent);
 		SparsePtr<Vector2f> texCoords = mapper.GetComponentPtr<Vector2f>(VertexComponent::TexCoord);
+		if (!texCoords)
+		{
+			// 3D coords are often used for slice indexing, we can get a Vector2 by keeping the stride
+			SparsePtr<Vector3f> texCoords3D = mapper.GetComponentPtr<Vector3f>(VertexComponent::TexCoord);
+			texCoords = SparsePtr<Vector2f>(texCoords3D.GetPtr(), texCoords3D.GetStride());
+		}
+
 		if (!normals || !positions || !tangents || !texCoords)
 			return;
 
@@ -118,6 +125,13 @@ namespace Nz
 		SparsePtr<Vector3f> positions = mapper.GetComponentPtr<Vector3f>(VertexComponent::Position);
 		SparsePtr<Vector3f> tangents = mapper.GetComponentPtr<Vector3f>(VertexComponent::Tangent);
 		SparsePtr<Vector2f> texCoords = mapper.GetComponentPtr<Vector2f>(VertexComponent::TexCoord);
+		if (!texCoords)
+		{
+			// 3D coords are often used for slice indexing, we can get a Vector2 by keeping the stride
+			SparsePtr<Vector3f> texCoords3D = mapper.GetComponentPtr<Vector3f>(VertexComponent::TexCoord);
+			texCoords = SparsePtr<Vector2f>(texCoords3D.GetPtr(), texCoords3D.GetStride());
+		}
+
 		if (!normals || !positions || !tangents || !texCoords)
 			return;