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+---
+title: WebGL2RenderingContext.beginTransformFeedback()
+slug: Web/API/WebGL2RenderingContext/beginTransformFeedback
+tags:
+  - API
+  - WebGL
+  - WebGL2
+  - 参考
+  - 实验性
+  - 方法
+translation_of: Web/API/WebGL2RenderingContext/beginTransformFeedback
+---
+<div>{{APIRef("WebGL")}} {{SeeCompatTable}}</div>
+
+<p><a href="/en-US/docs/Web/API/WebGL_API">WebGL 2 API</a> 的 <strong><code>WebGL2RenderingContext.beginTransformFeedback()</code></strong> 方法开始一个变换回传（Transform Feedback）操作。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">void <var>gl</var>.beginTransformFeedback(<var>primitiveMode</var>);
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>primitiveMode</code></dt>
+ <dd>A {{domxref("GLenum")}} specifying the output type of the primitives that will be recorded into the buffer objects that are bound for transform feedback. 可能的值：
+ <ul>
+  <li><code>gl.POINTS</code></li>
+  <li><code>gl.LINES</code></li>
+  <li><code>gl.TRIANGLES</code></li>
+ </ul>
+ </dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>无。</p>
+
+<h2 id="示例">示例</h2>
+
+<pre class="brush: js">var transformFeedback = gl.createTransformFeedback();
+gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, transformFeedback);
+gl.beginTransformFeedback(gl.TRIANGLES);
+gl.drawArrays(gl.TRIANGLES, 0, 3);
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('WebGL2', "#3.7.15", "beginTransformFeedback")}}</td>
+   <td>{{Spec2('WebGL2')}}</td>
+   <td>WebGL中初次定义。</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('OpenGL ES 3.0', "glBeginTransformFeedback.xhtml", "glBeginTransformFeedback")}}</td>
+   <td>{{Spec2('OpenGL ES 3.0')}}</td>
+   <td>OpenGL API 页面。</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p>{{Compat("api.WebGL2RenderingContext.beginTransformFeedback")}}</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{domxref("WebGLTransformFeedback")}}</li>
+</ul>