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+---
+title: WebGLRenderingContext.polygonOffset()
+slug: Web/API/WebGLRenderingContext/多边形偏移(polygonOffset)
+translation_of: Web/API/WebGLRenderingContext/polygonOffset
+---
+<div>{{APIRef("WebGL")}}</div>
+
+<p>The <strong><code>WebGLRenderingContext.polygonOffset()</code></strong> method of the <a href="/en-US/docs/Web/API/WebGL_API">WebGL API</a> specifies the scale factors and units to calculate depth values.</p>
+
+<p>The offset is added before the depth test is performed and before the value is written into the depth buffer.</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">void <var>gl</var>.polygonOffset(<var>factor</var>, <var>units</var>);
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt>factor</dt>
+ <dd>A {{domxref("GLfloat")}} which sets the scale factor for the variable depth offset for each polygon. 默认值为 0.</dd>
+ <dt>units</dt>
+ <dd>A {{domxref("GLfloat")}} which sets the multiplier by which an implementation-specific value is multiplied with to create a constant depth offset. 默认值为 0.</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>None.</p>
+
+<h2 id="例子">例子</h2>
+
+<p>The polygon offset fill is disabled by default. To enable or disable polygon offset fill, use the {{domxref("WebGLRenderingContext.enable", "enable()")}} and {{domxref("WebGLRenderingContext.disable", "disable()")}} methods with the argument <code>gl.POLYGON_OFFSET_FILL</code>.</p>
+
+<pre class="brush: js">gl.enable(gl.POLYGON_OFFSET_FILL);
+gl.polygonOffset(2, 3);
+</pre>
+
+<p>想要查看当前多边形偏移的 factor 或 units, 查询 <code>POLYGON_OFFSET_FACTOR</code> 和<code>POLYGON_OFFSET_UNITS</code> 的内容即可.</p>
+
+<pre class="brush: js">gl.getParameter(gl.POLYGON_OFFSET_FACTOR); // 2
+gl.getParameter(gl.POLYGON_OFFSET_UNITS);  // 3
+</pre>
+
+<h2 id="说明">说明</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", "polygonOffset")}}</td>
+   <td>{{Spec2('WebGL')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('OpenGL ES 2.0', "glPolygonOffset.xml", "glPolygonOffset")}}</td>
+   <td>{{Spec2('OpenGL ES 2.0')}}</td>
+   <td>Man page of the OpenGL API.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</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.WebGLRenderingContext.polygonOffset")}}</p>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{domxref("WebGLRenderingContext.depthFunc()")}}</li>
+</ul>