IntPtr 指向底层图形 API 索引缓冲区的指针。
检索指向索引缓冲区的原生（底层图形 API）指针。
使用此函数可检索与网格索引缓冲区对应的指针/句柄，
因为它以原生图形 API 表示。这可以用于通过
本机代码插件启用网格操作。
索引缓冲区数据是每个索引 16 或 32 位，具体取决于 indexFormat。另外索引缓冲区的布局
取决于使用的 MeshTopology（请参阅 SetIndices）。最常见的情况是由三角形列表
组成的网格，这些列表的索引缓冲区是每个三角形三个索引。
返回的数据类型取决于底层图形 API：
- D3D9 上的 IDirect3DIndexBuffer9
- D3D11 上的 ID3D11Buffer
- D3D12 上的 ID3D12Resource
- OpenGL/ES 上的缓冲区“名称”（作为 GLuint）
- Metal 上的 id<MTLBuffer>
对于大多数用例（从本机代码写入网格数据时），需要在获取原生缓冲区指针之前，
将网格标记为“动态”（请参阅 MarkDynamic）。通常这会将缓冲区切换为 CPU 可写入。
注意，在使用多线程渲染时调用此函数将与正在渲染的线程（慢速操作）同步，因此最佳做法是仅在初始化时设置所需的缓冲区指针。
另请参阅：本机代码插件、GetNativeVertexBufferPtr、SetIndices。
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