From f38bd1456e7d258c73b5022930401fa38f29b72c Mon Sep 17 00:00:00 2001
From: 06wj <06wj@163.com>
Date: Thu, 11 Apr 2024 11:25:05 +0800
Subject: [PATCH] fix: return a white texture when the texture is missing in
 semantic.handlerTexture

---
 src/material/semantic.js | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/material/semantic.js b/src/material/semantic.js
index e8b501b1..dd3fbadf 100644
--- a/src/material/semantic.js
+++ b/src/material/semantic.js
@@ -115,7 +115,8 @@ const semantic = {
             return this.handlerGLTexture(value.target, value.getGLTexture(state), textureIndex);
         }
 
-        return undefined;
+        const blankTexture = this.getBlankTexture();
+        return this.handlerGLTexture(blankTexture.target, blankTexture.getGLTexture(state), textureIndex);
     },
 
     /**
@@ -146,6 +147,20 @@ const semantic = {
         return 0;
     },
 
+    _blankTexture: null,
+    getBlankTexture() {
+        if (!this._blankTexture) {
+            this._blankTexture = new DataTexture({
+                width: 2,
+                height: 2,
+                type: constants.UNSIGNED_BYTE,
+                image: new Uint8Array([128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128]),
+            });
+        }
+
+        return this._blankTexture;
+    },
+
     // attributes
 
     /**