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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><!-- 这篇文章由Dancingwind翻译，作者的联系方式zhouwei02@mails.tsinghua.edu.cn --><title>NeHe OpenGL教程第四十六课，DancingWind翻译</title>


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    <td class="tinylogo" height="130" width="326"><img alt="NeHe Productions" src="Tutorial_46_files/logo.png" height="130" width="326"></td>
      <td align="center" valign="center"><div align="center"><font class="text"><font class="theme" size="+3"><b><i>第46课</i></b></font></font></div></td>
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            <td width="30%"><img src="Tutorial_46_files/lesson46.jpg" height="180" width="240"></td>
            <td width="70%"><p><font><b>全屏反走样</b></font></p>
              <p><font size="3">当今显卡的强大功能，你几乎什么都不用做，只需要在创建窗口的时候该一个数据。看看吧，驱动程序为你做完了一切。</font></p></td>
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    <td class="l"><img alt="" src="Tutorial_46_files/blank1.gif" height="28" width="28"></td>
      <td class="back3" valign="top" width="100%">在图形的绘制中，直线的走样是非常影响美观的，我们可以使用反走样解决这个问题。在众多的解决方案里，多重采样是一种易于硬件实现的方法，也是一种快速的方法。<br>
        全凭多重采样可以使你的图形看起来更美观，我们可以使用ARB_MULTISAMPLE扩展完成这个功能，但它会降低你的程序的速度。
<p>&nbsp;</p>
      <p>&nbsp;</p>
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<pre>Vid_mem = sizeof(Front_buffer) + sizeof(Back_buffer) + num_samples<br>		* (sizeof(Front_buffer) +sizeof(ZS_buffer))<br></pre>
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      <td class="back3" valign="top" width="100%">如果你想知道更多的关于多重采样的信息，请访问下面的链接：
<p><a href="http://developer.nvidia.com/attach/3464">GDC2002 -- OpenGL Multisample</a><br>
        <a href="http://developer.nvidia.com/attach/2064">OpenGL Pixel Formats 
        and Multisample Antialiasing</a> </p>
        <p>下面我们来介绍如何使用多重采样，不向其他的扩展，我们在使用多重采样时，必须在窗口创建时告诉它使用多重采样，典型的步骤如下：<br>
          1、创建一个窗口<br>
          2、查询是否支持多重采样<br>
          3、如果支持删除当前的窗口，使用支持多重采样的格式创建窗口<br>
          4、如果我们想使用多重采样，仅仅启用它既可。</p>
        <p>了解了上面，我们从头说明如何使用多重采样，并介绍ARB_Multisample的实现方法：</p>
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<pre>#include &lt;windows.h&gt;<br>#include &lt;gl.h&gt;<br>#include &lt;glu.h&gt;<br>#include "arb_multisample.h"</pre>
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      <td class="back3" valign="top" width="100%">下面两行定义我需要使用的像素格式</td>
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<pre><span class="theme">// 声明我们将要使用</span><br>#define WGL_SAMPLE_BUFFERS_ARB	0x2041<br>#define WGL_SAMPLES_ARB		0x2042</pre>
<p>bool arbMultisampleSupported = false;<br>
  int arbMultisampleFormat = 0;</p>
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