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		glDeleteBuffersARB = (PFNGLDELETEBUFFERSARBPROC) wglGetProcAddress("glDeleteBuffersARB");
<span class="theme">		// 创建VBO对象</span>
		g_pMesh-&gt;BuildVBOs();									
	}
#else 
	g_fVBOSupported = false;
#endif
<span class="theme">	//设置OpenGL状态</span>
	glClearColor (0.0f, 0.0f, 0.0f, 0.5f);						
	glClearDepth (1.0f);										
	glDepthFunc (GL_LEQUAL);									
	glEnable (GL_DEPTH_TEST);									
	glShadeModel (GL_SMOOTH);									
	glHint (GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);			
	glEnable( GL_TEXTURE_2D );									
	glColor4f( 1.0f, 1.0f, 1.0f, 1.0f );						

	return TRUE;												
}
</pre>
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    <td class="l"><img alt="" src="Tutorial_45_files/blank1.gif" height="28" width="28"></td>
      <td class="back3" valign="top" width="100%">下面的函数用来检测是否包含特定的扩展名称</td>
    <td class="r"><img alt="" src="Tutorial_45_files/blank1.gif" height="28" width="28"></td></tr></tbody></table>
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<pre><span class="theme">// 返回是否支持指定的扩展</span>
bool IsExtensionSupported( char* szTargetExtension )
{
	const unsigned char *pszExtensions = NULL;
	const unsigned char *pszStart;
	unsigned char *pszWhere, *pszTerminator;

	pszWhere = (unsigned char *) strchr( szTargetExtension, ' ' );
	if( pszWhere || *szTargetExtension == '\0' )
		return false;

<span class="theme">	// 返回扩展字符串</span>
	pszExtensions = glGetString( GL_EXTENSIONS );

<span class="theme">	// 在扩展字符串中搜索</span>
	pszStart = pszExtensions;
	for(;;)
	{
		pszWhere = (unsigned char *) strstr( (const char *) pszStart, szTargetExtension );
		if( !pszWhere )
			break;
		pszTerminator = pszWhere + strlen( szTargetExtension );
		if( pszWhere == pszStart || *( pszWhere - 1 ) == ' ' )
			if( *pszTerminator == ' ' || *pszTerminator == '\0' )
				<span class="theme">//如果存在返回True</span>
				return true;
		pszStart = pszTerminator;
	}
	return false;
}
</pre>
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    <td class="l"><img alt="" src="Tutorial_45_files/blank1.gif" height="28" width="28"></td>
    <td class="back3" valign="top" width="100%"><p>好了,几乎结束了,我们下面来看看我们的渲染代码.</p>
        </td>
    <td class="r"><img alt="" src="Tutorial_45_files/blank1.gif" height="28" width="28"></td></tr></tbody></table>
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<pre>void Draw (void)<br>{<br>	glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);		<br>	glLoadIdentity ();											</pre>
<p> <span class="theme">// 显示当前的帧率</span><br>
  if( GetTickCount() - g_dwLastFPS &gt;= 1000 ) <br>
  {<br>
  g_dwLastFPS = GetTickCount(); <br>
  g_nFPS = g_nFrames; <br>
  g_nFrames = 0; </p>
<p> char szTitle[256]={0}; <br>
  sprintf( szTitle, "Lesson 45: NeHe &amp; Paul Frazee's VBO Tut - %d Triangles, 
  %d FPS", g_pMesh-&gt;m_nVertexCount / 3, g_nFPS );<br>
  if( g_fVBOSupported ) <span class="theme">// 是否支持VBO</span><br>
  strcat( szTitle, ", Using VBOs" );<br>
  else<br>
  strcat( szTitle, ", Not Using VBOs" );<br>
  SetWindowText( g_window-&gt;hWnd, szTitle ); <span class="theme">// 设置窗口标题</span><br>
  }<br>
  g_nFrames++; <br>
  <br>
  <span class="theme">// 设置视口</span><br>
  glTranslatef( 0.0f, -220.0f, 0.0f ); <br>
  glRotatef( 10.0f, 1.0f, 0.0f, 0.0f ); <br>
  glRotatef( g_flYRot, 0.0f, 1.0f, 0.0f ); </p>
<p> <span class="theme">// 使用顶点，纹理坐标数组</span><br>
  glEnableClientState( GL_VERTEX_ARRAY ); <br>
  glEnableClientState( GL_TEXTURE_COORD_ARRAY ); </p>
<p></p>
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    <td class="l"><img alt="" src="Tutorial_45_files/blank1.gif" height="28" width="28"></td>
      <td class="back3" valign="top" width="100%">为了使用VBO，你必须告诉OpenGL内存中的那部分需要加载到VBO中。所以第一步我们要起用顶点数组和纹理坐标数组。接着我们必须告诉OpenGL去把数据的指针设置到特定的地方，glVertexPointer函数可以完成这个功能。<br>
        我们分为启用和不启用VBO两个路径来渲染，他们都差不多，唯一的区别是当你需要把指针指向VBO缓存时，记得把数据指针设置NULL。
<p>&nbsp;</p>
    </td>
    <td class="r"><img alt="" src="Tutorial_45_files/blank1.gif" height="28" width="28"></td></tr></tbody></table>
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<pre><span class="theme">	// 如果支持VBO扩展</span><br>	if( g_fVBOSupported )<br>	{<br>		glBindBufferARB( GL_ARRAY_BUFFER_ARB, g_pMesh-&gt;m_nVBOVertices );<br>		glVertexPointer( 3, GL_FLOAT, 0, (char *) NULL );		// 设置顶点数组的指针为顶点缓存<br>		glBindBufferARB( GL_ARRAY_BUFFER_ARB, g_pMesh-&gt;m_nVBOTexCoords );<br>		glTexCoordPointer( 2, GL_FLOAT, 0, (char *) NULL );		// 设置顶点数组的指针为纹理坐标缓存<br>	} <br><span class="theme">	// 不支持VBO扩展</span><br>	else<br>	{<br>		glVertexPointer( 3, GL_FLOAT, 0, g_pMesh-&gt;m_pVertices ); <br>		glTexCoordPointer( 2, GL_FLOAT, 0, g_pMesh-&gt;m_pTexCoords ); <br>	}</pre>
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    <td class="l"><img alt="" src="Tutorial_45_files/blank1.gif" height="28" width="28"></td>
      <td class="back3" valign="top" width="100%">好了,渲染所有的三角形吧</td>
    <td class="r"><img alt="" src="Tutorial_45_files/blank1.gif" height="28" width="28"></td></tr></tbody></table>
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    <td class="br"><img alt="" src="Tutorial_45_files/blank1.gif" height="28" width="28"></td></tr></tbody></table>
<pre>// 渲染<br>	glDrawArrays( GL_TRIANGLES, 0, g_pMesh-&gt;m_nVertexCount );		<br></pre>
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    <td class="l" width="3%"><img alt="" src="Tutorial_45_files/blank1.gif" height="28" width="28"></td>
      <td class="back3" valign="top" width="94%">最后,别忘了恢复到默认的OpenGL状态. </td>
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<pre><br>	glDisableClientState( GL_VERTEX_ARRAY );				<br>	glDisableClientState( GL_TEXTURE_COORD_ARRAY );			<br>}<br></pre>
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    <td class="l"><img alt="" src="Tutorial_45_files/blank1.gif" height="28" width="28"></td>
      <td class="back3" valign="top" width="100%"><p>如果你想更多的了解VBO对象,我建议你读一下SGI的扩展说明:<br>
          http://oss.sgi.com/projects/ogl-sample/registry<br>
          它会给你更多的信息</p>
        <p>好了,那就是这次的课程,如果你发现任何问题,请联系我.</p>
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    <td width="27%"><img src="Tutorial_45_files/logo%25203.jpg" align="middle" height="200" width="209"></td>
    <td width="73%">版权与使用声明:<br>
      我是个对学习和生活充满激情的普通男孩,在网络上我以DancingWind为昵称，我的联系方式是zhouwei02@mails.tsinghua.edu.cn，如果你有任何问题，都可以联系我。
      <p>引子<br>
网络是一个共享的资源，但我在自己的学习生涯中浪费大量的时间去搜索可用的资料，在现实生活中花费了大量的金钱和时间在书店中寻找资料，于是我给自己起了
个昵称DancingWind，其意义是想风一样从各个知识的站点中吸取成长的养料。在飘荡了多年之后，我决定把自己收集的资料整理为一个统一的资源库。</p>
      <p>版权声明<br>
所有DancingWind发表的内容，大多都来自共享的资源，所以我没有资格把它们据为己有，或声称自己为这些资源作出了一点贡献。故任何人都可以复
制，修改，重新发表，甚至以自己的名义发表，我都不会追究，但你在做以上事情的时候必须保证内容的完整性，给后来的人一个完整的教程。最后，任何人不能以
这些资料的任何部分，谋取任何形式的报酬。</p>
      <p>发展计划<br>
        在国外，很多资料都是很多人花费几年的时间慢慢积累起来的。如果任何人有兴趣与别人共享你的知识，我很欢迎你与我联系，但你必须同意我上面的声明。</p>
              <p>感谢<br>
                感谢我的母亲一直以来对我的支持和在生活上的照顾。<br>
                感谢我深爱的女友田芹，一直以来默默的在精神上和生活中对我的支持，她甚至把买衣服的钱都用来给我买书了，她真的是我见过的最好的女孩，希望我能带给她幸福。</p>
              <p>资源下载: <br>
                文档 <a href="http://www.owlei.com/DancingWind/Res/mht/NeHe%20OpenGL%20Chinese%20Course%2045.mht">网页格式</a> 
                <a href="http://www.owlei.com/DancingWind/Res/pdf/OpenGL_Nehe_Course_Tutorial_45.pdf">PDF格式</a><br>
                源码 <a href="http://www.owlei.com/DancingWind/Res/Src/45_vbo.rar">RAR格式</a></p></td>
  </tr>
</tbody></table>
        <font class="text">
        <table border="0" width="100%">
          <tbody>
            <tr> 
              <td align="left" width="50%"><b><font size="-1"><a href="http://www.owlei.com/DancingWind/Course/Tutorial_44.htm">&lt; 第44课</a></font></b></td>
              <td align="right" width="50%"><b><font size="-1"><a href="http://www.owlei.com/DancingWind/Course/Tutorial_46.htm">第46课 &gt;&nbsp;</a></font></b></td>
            </tr>
          </tbody>
        </table>
        </font> 		
    </td>
    <td class="r"><img alt="" src="Tutorial_45_files/blank1.gif" height="28" width="28"></td></tr></tbody></table>
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