From 0e2637ba54ebdd2d7adfd5ca4dc189317cce8612 Mon Sep 17 00:00:00 2001
From: finscn <finscn@gmail.com>
Date: Sun, 31 Aug 2025 01:59:44 +0800
Subject: [PATCH] =?UTF-8?q?Update=20simple.ts=20=E4=BF=AE=E6=AD=A3=20MaxGr?=
 =?UTF-8?q?idsLimit=20=E8=AE=A1=E7=AE=97=E9=94=99=E8=AF=AF.?=
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虽然 写入buffer的顶点数据是6个, 但是决定 fillCount 上限的是 顶点的索引.

```ts

    fillBuffers (layer: TiledLayer, renderer: IBatcher): void {
        if (!layer || layer.tiledDataArray.length === 0) return;

        const dataArray = layer.tiledDataArray;

        // 当前渲染的数据
        const data = dataArray[layer._tiledDataArrayIdx] as TiledRenderData;
        const renderData = data.renderData;
        if (!renderData) return;
        const iBuf = renderData.chunk.meshBuffer.iData;

        let indexOffset = renderData.chunk.meshBuffer.indexOffset;
        let vertexId = renderData.chunk.vertexOffset;
        const quadCount = renderData.vertexCount / 4;
        for (let i = 0; i < quadCount; i += 1) {
            iBuf[indexOffset] = vertexId;
            iBuf[indexOffset + 1] = vertexId + 1;
            iBuf[indexOffset + 2] = vertexId + 2;
            iBuf[indexOffset + 3] = vertexId + 2;
            iBuf[indexOffset + 4] = vertexId + 1;
            iBuf[indexOffset + 5] = vertexId + 3;
            indexOffset += 6;
            vertexId += 4;
        }
        renderData.chunk.meshBuffer.indexOffset = indexOffset;
    }

```

也就是上述代码中的  vertexCount / 4 决定了 fillCount

最多是 65536 / 4 .
---
 cocos/tiledmap/assembler/simple.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cocos/tiledmap/assembler/simple.ts b/cocos/tiledmap/assembler/simple.ts
index 07d6034d6a5..372b0178690 100644
--- a/cocos/tiledmap/assembler/simple.ts
+++ b/cocos/tiledmap/assembler/simple.ts
@@ -36,7 +36,7 @@ import { RenderDrawInfoType } from '../../2d/renderer/render-draw-info';
 import type { Texture2D } from '../../asset/assets';
 import type { Node } from '../../scene-graph';
 
-const MaxGridsLimit = Math.ceil(65535 / 6);
+const MaxGridsLimit = 65536 / 4;
 
 const vec3_temps: Vec3[] = [];
 for (let i = 0; i < 4; i++) {