Fix text global alpha error (#2811)

* fix: text global alpha erro

Author: cptbtptpbcptdtptp

packages/ui/src/component/advanced/Text.ts

@@ -366,8 +366,8 @@ export class Text extends UIRenderer implements ITextRenderer {
 
     // prettier-ignore
     const e0 = e[0], e1 = e[1], e2 = e[2],
-          e4 = e[4], e5 = e[5], e6 = e[6],
-          e12 = e[12], e13 = e[13], e14 = e[14];
+      e4 = e[4], e5 = e[5], e6 = e[6],
+      e12 = e[12], e13 = e[13], e14 = e[14];
 
     const up = UIRenderer._tempVec31.set(e4, e5, e6);
     const right = UIRenderer._tempVec30.set(e0, e1, e2);
@@ -605,6 +605,7 @@ export class Text extends UIRenderer implements ITextRenderer {
 
   private _buildChunk(textChunk: TextChunk, count: number) {
     const { r, g, b, a } = this.color;
+    const finalAlpha = a * this._getGlobalAlpha();
     const tempIndices = CharRenderInfo.triangles;
     const tempIndicesLength = tempIndices.length;
     const subChunk = (textChunk.subChunk = this._getChunkManager().allocateSubChunk(count * 4));
@@ -627,7 +628,7 @@ export class Text extends UIRenderer implements ITextRenderer {
         vertices[vo + 2] = r;
         vertices[vo + 3] = g;
         vertices[vo + 4] = b;
-        vertices[vo + 5] = a;
+        vertices[vo + 5] = finalAlpha;
       }
     }