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      <td class="back3" valign="top" width="100%">下面的代码是Cg的主函数,每个顶点都会被以下函数执行: 
        <p>&nbsp;</p>
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<p>vfconn main(appdata IN, uniform float4x4 ModelViewProj)<br>
  {<br>
  vfconn OUT; <span class="theme">// 保存我们输出顶点的数据</span></p>
<p> <span class="theme">// 计算顶点y的坐标</span><br>
  IN.position.y = ( sin(IN.wave.x + (IN.position.x / 5.0) ) + sin(IN.wave.x + 
  (IN.position.z / 4.0) ) ) * 2.5f;<br>
  <br>
  <span class="theme">// 保存到输出数据中</span><br>
  OUT.HPos = mul(ModelViewProj, IN.position);</p>
<p> <span class="theme">// 不改变输入的颜色</span><br>
  OUT.Col0.xyz = IN.color.xyz;</p>
<p> return OUT;<br>
  }</p>
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      <td class="back3" valign="top" width="100%"><p>完成了上面的代码,记得保存一下.</p>
        <p>下面我们到了程序中,首先包含使用cg需要的头文件,和库文件</p>
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<pre>#include &lt;cg\cg.h&gt;									<br>#include &lt;cg\cggl.h&gt;									</pre>
<pre>#pragma comment( lib, "cg.lib" )							<br>#pragma comment( lib, "cggl.lib" )							</pre>
<p></p>
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      <td class="back3" valign="top" width="100%">下面我们定义一些全局变量，用来计算我们得网格和控制cg程序的开关</td>
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<pre>#define		SIZE	64							<span class="theme">	// 定义网格的大小</span><br>bool		cg_enable = TRUE, sp;							<span class="theme">// 开关Cg程序</span><br>GLfloat		mesh[SIZE][SIZE][3];							<span class="theme">// 保存我们的网格</span><br>GLfloat		wave_movement = 0.0f;						<span class="theme">	// 记录波动的移动</span></pre>
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      <td class="back3" valign="top" width="100%">下面我们来定义一些cg相关的全局变量 
        <p></p>
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<pre>	CGcontext	cgContext;								<span class="theme">// 用来保存cg脚本</span></pre>
<p></p>
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      <td class="back3" valign="top" width="100%">我们需要的第一个变量是CGcontext,这个变量是多个Cg脚本的容器,一般来说,你获得你可以用函数从这个容器中获得你想要的脚本
<p>接下来我们定义一个CGprogram变量,它用来保存我们得顶点脚本</p>
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<pre>CGprogram	cgProgram;							<span class="theme">	// 我们得顶点脚本</span></pre>
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      <td class="back3" valign="top" width="100%">接下来我们需要一个变量来设置如何编译这个顶点脚本</td>
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<pre>CGprofile	cgVertexProfile;						<span class="theme">	// 被顶点脚本使用</span></pre>
<p></p>
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      <td class="back3" valign="top" width="100%">下面我们需要一些参数用来把Cg脚本使用的数据从程序中传送过去。</td>
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<pre>CGparameter	position, color, modelViewMatrix, wave;				<span class="theme">	// 脚本中需要的参数</span></pre>
<p></p>
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      <td class="back3" valign="top" width="100%">在初始化阶段我们先要创建我们网格数据</td>
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<pre>	glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);					</pre>
<p> for (int x = 0; x &lt; SIZE; x++)<br>
  {<br>
  for (int z = 0; z &lt; SIZE; z++)<br>
  {<br>
  mesh[x][z][0] = (float) (SIZE / 2) - x; <br>
  mesh[x][z][1] = 0.0f; <br>
  mesh[x][z][2] = (float) (SIZE / 2) - z; <br>
  }<br>
  }</p>
<p></p>
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      <td class="back3" valign="top" width="100%">我们设置多边形的现实模式为线框图，接着遍历没有顶点，设置其高度。
        <p>接下来，我们初始化Cg程序</p>
        <p>&nbsp;</p>
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<pre><span class="theme">// 设置Cg</span><br>	cgContext = cgCreateContext();							<span class="theme">// 创建一个Cg容器</span></pre>
<p> <span class="theme">// 测试是否创建成功</span><br>
  if (cgContext == NULL)<br>
  {<br>
  MessageBox(NULL, "Failed To Create Cg Context", "Error", 
  MB_OK);<br>
  return FALSE; <br>
  }<br>
</p>
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      <td class="back3" valign="top" width="100%">我们创建一个Cg程序的容器，并检查它是否创建成功</td>
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<pre>cgVertexProfile = cgGLGetLatestProfile(CG_GL_VERTEX);				<span class="theme">// 配置在OpenGL中使用顶点缓存</span></pre>
<p> <span class="theme">// 检测Cg程序的是否创建成功</span><br>
  if (cgVertexProfile == CG_PROFILE_UNKNOWN)<br>
  {<br>
  MessageBox(NULL, "Invalid profile type", "Error", MB_OK);<br>
  return FALSE; <br>
  }</p>
<p> cgGLSetOptimalOptions(cgVertexProfile); <span class="theme">// 启用配置文件</span></p>
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