From d3439abc528abe8563ac1b1a4ce950d3717aa77b Mon Sep 17 00:00:00 2001
From: Masataka SUMI <santarh@gmail.com>
Date: Sat, 3 Aug 2024 01:00:53 +0900
Subject: [PATCH] Implements UrpFallbackMaterialExporter

---
 .../Materials/UrpFallbackMaterialExporter.cs  | 36 +++++++++++++++++++
 .../UrpFallbackMaterialExporter.cs.meta       |  3 ++
 2 files changed, 39 insertions(+)
 create mode 100644 Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/URP/Export/Materials/UrpFallbackMaterialExporter.cs
 create mode 100644 Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/URP/Export/Materials/UrpFallbackMaterialExporter.cs.meta

diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/URP/Export/Materials/UrpFallbackMaterialExporter.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/URP/Export/Materials/UrpFallbackMaterialExporter.cs
new file mode 100644
index 000000000..c590d4e93
--- /dev/null
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/URP/Export/Materials/UrpFallbackMaterialExporter.cs
@@ -0,0 +1,36 @@
+using System;
+using UnityEngine;
+
+namespace UniGLTF
+{
+    /// <summary>
+    /// フォールバック目的で最低限なにかをエクスポートする。
+    ///
+    /// メインカラーとメインテクスチャをエクスポートする。
+    /// </summary>
+    public class UrpFallbackMaterialExporter
+    {
+        public glTFMaterial ExportMaterial(Material src, ITextureExporter textureExporter)
+        {
+            var dst = new glTFMaterial
+            {
+                name = src.name,
+                pbrMetallicRoughness = new glTFPbrMetallicRoughness(),
+            };
+
+            dst.pbrMetallicRoughness.baseColorFactor = src.color.ToFloat4(ColorSpace.sRGB, ColorSpace.Linear);
+            var index = textureExporter.RegisterExportingAsSRgb(src.mainTexture, false);
+            if (index >= 0)
+            {
+                dst.pbrMetallicRoughness.baseColorTexture = new glTFMaterialBaseColorTextureInfo
+                {
+                    index = index,
+                    texCoord = 0,
+                };
+                GltfMaterialExportUtils.ExportTextureTransform(src.mainTextureOffset, src.mainTextureScale, dst.pbrMetallicRoughness.baseColorTexture);
+            }
+
+            return dst;
+        }
+    }
+}
\ No newline at end of file
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/URP/Export/Materials/UrpFallbackMaterialExporter.cs.meta b/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/URP/Export/Materials/UrpFallbackMaterialExporter.cs.meta
new file mode 100644
index 000000000..908fd8446
--- /dev/null
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/URP/Export/Materials/UrpFallbackMaterialExporter.cs.meta
@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: c0269be076674f5988895ecd61b8d316
+timeCreated: 1722612454
\ No newline at end of file