tutorial_12.htm

如果你相信它就好好学学吧,同样这里也只是个入门

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    <td background="Tutorial_12_files/l.gif"><img src="Tutorial_12_files/l.gif" height="28" width="28"></td>
      <td valign="top" width="100%">贴图纹理的代码和之前教程里的代码是一样的。我们需要一个可以贴在立方体上的纹理。我决定使用mipmapping处理让纹理看上去光滑，因为我讨厌看见像素点。纹理的文件名是“cube.bmp”，存放在data目录下。<br></td>
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<pre>	if (TextureImage[0]=LoadBMP("Data/Cube.bmp"))	</pre>
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      <td valign="top" width="100%"><p>改变窗口大小的代码和第六课是一样的。</p>
        <p> 初始化的代码只有一点改变，加入了一行BuildList()。请注意代码的顺序，先读入纹理，然后建立显示列表，这样当我们建立显示列表的时候就可以将纹理贴到立方体上了。<br>
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<pre>BuildLists();						<font color="#ffffaa">// 创建显示列表</font>
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      <td valign="top" width="100%"><p>接下来的三行使灯光有效。Light0一般来说是在显卡中预先定义过的，如果Light0不工作，把下面那行注释掉好了。</p>
        <p> 最后一行的GL_COLOR_MATERIAL使我们可以用颜色来贴纹理。如果没有这行代码，纹理将始终保持原来的颜色，glColor3f(r,g,b)就没有用了。总之这行代码是很有用的。</p></td>
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<pre>	glEnable(GL_LIGHT0);					<font color="#ffffaa">// 使用默认的0号灯</font>
	glEnable(GL_LIGHTING);					<font color="#ffffaa">// 使用灯光</font>
	glEnable(GL_COLOR_MATERIAL);				<font color="#ffffaa">// 使用颜色材质</font>
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    <td valign="top" width="100%"><p><font face="arial">现在到了绘制代码的地方了，我们还是和以前一样，以清除背景颜色为开始。 
          </font></p>
        <p><font face="arial">接着把纹理绑定到立方体，我可以把这些代码加入到显示列表中，但我还是把它留在了显示列表外边，这样我可以随便设置纹理。</font></p>
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<pre>int DrawGLScene(GLvoid)						<font color="#ffffaa">// 绘制操作开始</font>
{
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);	<font color="#ffffaa">// 清除背景颜色</font>

	glBindTexture(GL_TEXTURE_2D, texture[0]);		<font color="#ffffaa">// 选择纹理</font>
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      <td valign="top" width="100%">现在到了真正有趣的地方了。用一个循环，循环变量用于改变Y轴位置，在Y轴上画5个立方体，所以用从1到5的循环。<br></td>
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<pre>	for (yloop=1;yloop&lt;6;yloop++)				<font color="#ffffaa">// 沿Y轴循环</font>
	{
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    <td background="Tutorial_12_files/l.gif"><img src="Tutorial_12_files/l.gif" height="28" width="28"></td>
      <td valign="top" width="100%">另外用一个循环，循环变量用于改变X轴位置。每行上的立方体数目取决于行数，所以循环方式如下。<br></td>
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<pre>		for (xloop=0;xloop&lt;yloop;xloop++)		<font color="#ffffaa">// 沿X轴循环</font>
		{
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      <td valign="top" width="100%"><font face="arial">重置模型变化矩阵</font></td>
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<pre>			glLoadIdentity();			<font color="#ffffaa">// 重置模型变化矩阵</font>
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