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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教程第二十六课，DancingWind翻译</title>





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<table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td height="130" width="326"><img src="Tutorial_26_files/logo.png" height="130" width="326"></td>
    <td align="center" valign="middle" width="75%"><font color="#ffccaa" size="+3"><b><i>第26课</i></b></font></td>
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            <td width="31%"><img src="Tutorial_26_files/lesson26.jpg" height="180" width="240"></td>
            <td width="69%"><p><font class="head">剪裁平面，蒙板缓存和反射:</font></p>
              <p><font size="3">在这一课中你将学会如何创建镜面显示效果，它使用剪裁平面，蒙板缓存等OpenGL中一些高级的技巧。</font></p></td>
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  <table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_26_files/tl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_26_files/tc.png" height="28" width="100%"></td><td><img src="Tutorial_26_files/tr.png" height="28" width="28"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td background="Tutorial_26_files/l.png"><img src="Tutorial_26_files/l.png"></td>
    <td valign="top" width="100%">欢迎来到另一个激动人心的课程，这课的代码是Banu Cosmin所写，当然教程还是我自己写的。在这课里，我将教你创建真正的反射，基于物理的。<br>
      由于它将用到蒙板缓存，所以需要耗费一些资源。当然随着显卡和CPU的发展，这些都不是问题了，好了让我们开始吧！<br></td><td background="Tutorial_26_files/r.png"><img src="Tutorial_26_files/r.png"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_26_files/bl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_26_files/bc.png" height="28" width="100%"></td><td><img src="Tutorial_26_files/br.png" height="28" width="28"></td></tr></tbody></table>
<font color="#aaffaa" size="3"> </font> <font color="#aaffaa" size="3"> </font> 
<table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_26_files/tl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_26_files/tc.png" height="28" width="100%"></td><td><img src="Tutorial_26_files/tr.png" height="28" width="28"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td background="Tutorial_26_files/l.png"><img src="Tutorial_26_files/l.png"></td>
    <td valign="top" width="100%">下面我们设置光源的参数</td>
    <td background="Tutorial_26_files/r.png"><img src="Tutorial_26_files/r.png"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_26_files/bl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_26_files/bc.png" height="28" width="100%"></td><td><img src="Tutorial_26_files/br.png" height="28" width="28"></td></tr></tbody></table><font color="#aaffaa" size="3">
<pre>static GLfloat	LightAmb[] = {0.7f, 0.7f, 0.7f, 1.0f};				<font color="#ffffaa">// 环境光</font>
static GLfloat	LightDif[] = {1.0f, 1.0f, 1.0f, 1.0f};				<font color="#ffffaa">// 漫射光</font>
static GLfloat	LightPos[] = {4.0f, 4.0f, 6.0f, 1.0f};				<font color="#ffffaa">// 灯光的位置</font></pre>
</font><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_26_files/tl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_26_files/tc.png" height="28" width="100%"></td><td><img src="Tutorial_26_files/tr.png" height="28" width="28"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td background="Tutorial_26_files/l.png"><img src="Tutorial_26_files/l.png"></td>
    <td valign="top" width="100%">下面用二次几何体创建一个球，并设置纹理</td>
    <td background="Tutorial_26_files/r.png"><img src="Tutorial_26_files/r.png"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_26_files/bl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_26_files/bc.png" height="28" width="100%"></td><td><img src="Tutorial_26_files/br.png" height="28" width="28"></td></tr></tbody></table><font color="#aaffaa" size="3">
</font><pre><font color="#aaffaa" size="3">GLUquadricObj	*q;								<font color="#ffffaa">// 使用二次几何体创建球</font>

GLfloat		xrot		=  0.0f;					<font color="#ffffaa">	// X方向的旋转角度</font>
GLfloat		yrot		=  0.0f;						<font color="#ffffaa">// Y方向的旋转角的</font>
GLfloat		xrotspeed	=  0.0f;					<font color="#ffffaa">		// X方向的旋转速度</font>
GLfloat		yrotspeed	=  0.0f;							<font color="#ffffaa">// Y方向的旋转速度</font>
GLfloat		zoom		= -7.0f;						<font color="#ffffaa">// 移入屏幕7个单位</font>
GLfloat		height		=  2.0f;						<font color="#ffffaa">// 球离开地板的高度</font>

GLuint		texture[3];							<font color="#ffffaa">// 使用三个纹理</font></font></pre>
<table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_26_files/tl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_26_files/tc.png" height="28" width="100%"></td><td><img src="Tutorial_26_files/tr.png" height="28" width="28"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td background="Tutorial_26_files/l.png"><img src="Tutorial_26_files/l.png"></td>
    <td valign="top" width="100%">ReSizeGLScene() 和LoadBMP() 没有变化</td>
    <td background="Tutorial_26_files/r.png"><img src="Tutorial_26_files/r.png"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_26_files/bl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_26_files/bc.png" height="28" width="100%"></td><td><img src="Tutorial_26_files/br.png" height="28" width="28"></td></tr></tbody></table><font color="#aaffaa" size="3"><pre>GLvoid ReSizeGLScene(GLsizei width, GLsizei height)

AUX_RGBImageRec *LoadBMP(char *Filename)
</pre></font><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_26_files/tl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_26_files/tc.png" height="28" width="100%"></td><td><img src="Tutorial_26_files/tr.png" height="28" width="28"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td background="Tutorial_26_files/l.png"><img src="Tutorial_26_files/l.png"></td>
    <td valign="top" width="100%"><font color="#ffffff">下面的代码载入纹理</font></td>
    <td background="Tutorial_26_files/r.png"><img src="Tutorial_26_files/r.png"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_26_files/bl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_26_files/bc.png" height="28" width="100%"></td><td><img src="Tutorial_26_files/br.png" height="28" width="28"></td></tr></tbody></table><font color="#aaffaa" size="3">
	
<pre>int LoadGLTextures()								<font color="#ffffaa">// 载入*.bmp文件，并转化为纹理</font>
{
    int Status=FALSE;								
    AUX_RGBImageRec *TextureImage[3];						<font color="#ffffaa">// 创建三个图象</font>
    memset(TextureImage,0,sizeof(void *)*3);					
    if ((TextureImage[0]=LoadBMP("Data/EnvWall.bmp")) &amp;&amp;				<font color="#ffffaa">// 载入地板图像</font>
        (TextureImage[1]=LoadBMP("Data/Ball.bmp")) &amp;&amp;					<font color="#ffffaa">// 载入球图像</font>
        (TextureImage[2]=LoadBMP("Data/EnvRoll.bmp")))					<font color="#ffffaa">// 载入强的图像</font>
	{
		Status=TRUE;							
		glGenTextures(3, &amp;texture[0]);					<font color="#ffffaa">// 创建纹理</font>
		for (int loop=0; loop&lt;3; loop++)				<font color="#ffffaa">	// 循环设置三个纹理参数</font>
		{
			glBindTexture(GL_TEXTURE_2D, texture[loop]);
			glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage[loop]-&gt;sizeX, TextureImage[loop]-&gt;sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[loop]-&gt;data);
			glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
			glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
		}
		for (loop=0; loop&lt;3; loop++)					
		{
			if (TextureImage[loop])					
			{
				if (TextureImage[loop]-&gt;data)			
				{
					free(TextureImage[loop]-&gt;data);		
				}
				free(TextureImage[loop]);
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