From 2ec90edf665fc48e4b459f5419582ed86e2ae8d5 Mon Sep 17 00:00:00 2001
From: ousttrue <ousttrue@gmail.com>
Date: Wed, 5 Oct 2022 14:47:54 +0900
Subject: [PATCH] Rewrite `??=`.

This is cause `CS1525: Invalid expression term '='` in Unity-2019.
#1840
---
 .../Runtime/UniGLTF/IO/TextureIO/GltfTextureImporter.cs      | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/TextureIO/GltfTextureImporter.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/TextureIO/GltfTextureImporter.cs
index 27cdef130..753cecb1a 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/IO/TextureIO/GltfTextureImporter.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/TextureIO/GltfTextureImporter.cs
@@ -151,7 +151,10 @@ namespace UniGLTF
                     {
                         name = TextureImportName.GetUnityObjectName(TextureImportTypes.StandardMap, gltfTexture.name, gltfImage.uri);
                     }
-                    sampler ??= TextureSamplerUtil.CreateSampler(data.GLTF, occlusionTextureIndex.Value);
+                    if (sampler == null)
+                    {
+                        sampler = TextureSamplerUtil.CreateSampler(data.GLTF, occlusionTextureIndex.Value);
+                    }
                     getOcclusionAsync = () => Task.FromResult(GetImageBytesFromImageIndex(data, imageIndex.Value));
                 }
             }