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: WebGLRenderingContext.activeTexture()
+slug: Web/API/WebGLRenderingContext/activeTexture
+translation_of: Web/API/WebGLRenderingContext/activeTexture
+---
+<div>{{APIRef("WebGL")}}</div>
+
+<p><strong><code>WebGLRenderingContext.activeTexture() </code></strong>是 <a href="/en-US/docs/Web/API/WebGL_API">WebGL API</a> 方法之一，用来激活指定的纹理单元。</p>
+
+<h2 id="句法">句法</h2>
+
+<pre class="syntaxbox"><var><em>void gl</em>.activeTexture</var><var>(texture);</var>
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>texture</code></dt>
+ <dd>需要激活的纹理单元。其值是 <code>gl.TEXTURE<em>I</em></code> ，其中的 <em>I</em> 在 0 到 <code>gl.MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1 </code>范围内。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>无返回值。</p>
+
+<h3 id="异常">异常</h3>
+
+<p>如果 <em>texture </em>不是 <code>gl.TEXTURE<em>I(</em></code> <em>I </em>在 0 到 <code>gl.MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1 </code>范围内)，一个 <code>gl.INVALID_ENUM</code> 错误将被抛出。</p>
+
+<h2 id="示例">示例</h2>
+
+<p>接下来调用 <code>gl.TEXTURE1</code> 作为当前纹理，随后对纹理状态的更改将会影响到这个纹理。</p>
+
+<pre class="brush: js">gl.activeTexture(gl.TEXTURE1);
+</pre>
+
+<p>纹理单元的数量视实现而定， 你可以通过访问常量 <code>MAX_COMBINED_TEXTURE_IMAGE_UNITS</code> 来获取这个值。按照规范来说，最少是 8 个。</p>
+
+<pre class="brush: js">gl.getParameter(gl.MAX_COMBINED_TEXTURE_IMAGE_UNITS);
+</pre>
+
+<p>想要获取激活的纹理，可以查询常量 <code>ACTIVE_TEXTURE</code><code>。</code></p>
+
+<pre class="brush: js">gl.activeTexture(gl.TEXTURE0);
+gl.getParameter(gl.ACTIVE_TEXTURE);
+// returns "33984" (0x84C0, gl.TEXUTURE0 enum value)
+</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('WebGL', "#5.14.3", "activeTexture")}}</td>
+   <td>{{Spec2('WebGL')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('OpenGL ES 2.0', "glActiveTexture.xml", "glActiveTexture")}}</td>
+   <td>{{Spec2('OpenGL ES 2.0')}}</td>
+   <td>Man page of the OpenGL API.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatChrome("9")}}</td>
+   <td>{{CompatGeckoDesktop("2.0")}}</td>
+   <td>{{CompatIE("11")}}</td>
+   <td>{{CompatOpera("12")}}</td>
+   <td>{{CompatSafari("5.1")}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Chrome for Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatUnknown}}</td>
+   <td>25</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>12</td>
+   <td>8.1</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="另见">另见</h2>
+
+<ul>
+ <li>{{domxref("WebGLRenderingContext.getParameter()")}}</li>
+</ul>
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