From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: WebGL2RenderingContext.beginQuery()
+slug: Web/API/WebGL2RenderingContext/beginQuery
+translation_of: Web/API/WebGL2RenderingContext/beginQuery
+---
+<div>{{APIRef("WebGL")}} {{SeeCompatTable}}</div>
+
+<p><a href="/en-US/docs/Web/API/WebGL_API">WebGL 2 API</a> 的<strong><code>WebGL2RenderingContext.beginQuery()</code></strong> 方法启动一个异步查询，<code>target</code> 参数表明是哪种类型的查询。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">void <var>gl</var>.beginQuery(<var>target</var>, <var>query</var>);
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt>target</dt>
+ <dd> {{domxref("GLenum")}} 指定查询个的target， 可能的值有:
+ <ul>
+  <li><code>gl.ANY_SAMPLES_PASSED</code>: Specifies an occlusion query: these queries detect whether an object is visible (whether the scoped drawing commands pass the depth test and if so, how many samples pass).</li>
+  <li><code>gl.ANY_SAMPLES_PASSED_CONSERVATIVE</code>: 和以上一样， 但是是一个不精确和更快的版本。</li>
+  <li><code>gl.TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN</code>: Number of primitives that are written to transform feedback buffers.</li>
+ </ul>
+ </dd>
+ <dt><code>query</code></dt>
+ <dd>一个{{domxref("WebGLQuery")}} 对象用于查询。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>None.</p>
+
+<h2 id="例子">例子</h2>
+
+<pre class="brush: js">var query = gl.createQuery();
+gl.beginQuery(gl.ANY_SAMPLES_PASSED, query);
+
+// ...
+</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', "#3.7.12", "beginQuery")}}</td>
+   <td>{{Spec2('WebGL2')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('OpenGL ES 3.0', "glBeginQuery.xhtml", "glBeginQuery")}}</td>
+   <td>{{Spec2('OpenGL ES 3.0')}}</td>
+   <td>Man page of the (similar) OpenGL API.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容">浏览器兼容</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.beginQuery")}}</p>
+
+<h2 id="参考">参考</h2>
+
+<ul>
+ <li>{{domxref("WebGLQuery")}}</li>
+</ul>
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