www.pudn.com > 3DSLoader.rar > SkyBox.cpp

//======================================================== 
/** 
*  @file      SkyBox.cpp 
* 
*  项目描述： 3DS文件载入 
*  文件描述:  天空盒类   
*  适用平台： Windows98/2000/NT/XP 
*   
*  作者：     WWBOSS 
*  电子邮件:  wwboss123@gmail.com 
*  创建日期： 2006-12-06	 
*  修改日期： 2006-12-10 
* 
*/      
//======================================================== 
 
#include "SkyBox.h" 
 
	 
CSkyBox::CSkyBox():length(750.0f),width(550.0f),height(400.0f),yRot(0.01f) 
{	 
} 
 
CSkyBox::~CSkyBox() 
{ 
	/** 删除纹理对象及其占用的内存 */ 
	for(int i =0 ;i< 5; i++) 
	{ 
		m_texture[i].FreeImage(); 
		glDeleteTextures(1,&m_texture[i].ID); 
	} 
	 
} 
 
 
/** 天空盒初始化 */ 
bool CSkyBox::init() 
{ 
	char filename[128] ;                                         /**< 用来保存文件名 */ 
	char *bmpName[] = { "back","front","top","left","right"}; 
	for(int i=0; i< 5; i++) 
	{ 
		sprintf(filename,"data/%s",bmpName[i]); 
		strcat(filename,".bmp"); 
		if(!m_texture[i].LoadBitmap(filename))                     /**< 载入位图文件 */ 
		{ 
			MessageBox(NULL,"装载位图文件失败！","错误",MB_OK);    /**< 如果载入失败则弹出对话框 */ 
			exit(0); 
		} 
		glGenTextures(1, &m_texture[i].ID);                        /**< 生成一个纹理对象名称 */ 
		  
		glBindTexture(GL_TEXTURE_2D, m_texture[i].ID);             /**< 创建纹理对象 */ 
		/** 控制滤波 */ 
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST); 
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); 
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP_TO_EDGE); 
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP_TO_EDGE); 
		/** 创建纹理 */ 
		gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGB, m_texture[i].imageWidth, 
						m_texture[i].imageHeight, GL_RGB, GL_UNSIGNED_BYTE, 
					    m_texture[i].image); 
	} 
	return true; 
	 
} 
 
 
void CSkyBox::render() 
{ 
	/** 获得场景中光照状态 */ 
	GLboolean lp; 
	glGetBooleanv(GL_LIGHTING,&lp); 
 
	m_CameraPos = Camera::GetCamera()->getPosition(); 
 
	glDisable(GL_LIGHTING);            /**< 关闭光照 */ 
	glEnable(GL_TEXTURE_2D); 
 
	/** 开始绘制 */ 
	glPushMatrix(); 
	glTranslatef(m_CameraPos.x,m_CameraPos.y,m_CameraPos.z); 
 
	glRotatef(yRot,0.0f,1.0f,0.0f); 
			 
	/** 绘制背面 */ 
	glBindTexture(GL_TEXTURE_2D, m_texture[0].ID); 
    glBegin(GL_QUADS);		 
		 
		/** 指定纹理坐标和顶点坐标 */ 
		glTexCoord2f(1.0f, 0.0f); glVertex3f(  width, -height, -length); 
		glTexCoord2f(1.0f, 1.0f); glVertex3f(  width,  height, -length);  
		glTexCoord2f(0.0f, 1.0f); glVertex3f( -width,  height, -length); 
		glTexCoord2f(0.0f, 0.0f); glVertex3f( -width, -height, -length); 
		 
	glEnd(); 
 
 
 
	/** 绘制前面 */ 
	glBindTexture(GL_TEXTURE_2D, m_texture[1].ID); 
	glBegin(GL_QUADS);	 
	 
		/** 指定纹理坐标和顶点坐标 */ 
		glTexCoord2f(1.0f, 0.0f); glVertex3f( -width, -height, length); 
		glTexCoord2f(1.0f, 1.0f); glVertex3f( -width,  height, length); 
		glTexCoord2f(0.0f, 1.0f); glVertex3f(  width,  height, length);  
		glTexCoord2f(0.0f, 0.0f); glVertex3f(  width, -height, length); 
 
	glEnd(); 
 
	 
 
	/** 绘制顶面 */ 
	glBindTexture(GL_TEXTURE_2D,  m_texture[2].ID); 
	glBegin(GL_QUADS);		 
		 
	    /** 指定纹理坐标和顶点坐标 */ 
		glTexCoord2f(0.0f, 1.0f); glVertex3f(  width, height, -length); 
		glTexCoord2f(0.0f, 0.0f); glVertex3f(  width, height,  length);  
		glTexCoord2f(1.0f, 0.0f); glVertex3f( -width, height,  length); 
	    glTexCoord2f(1.0f, 1.0f); glVertex3f( -width, height, -length); 
		 
	glEnd(); 
 
 
	 
	/** 绘制左面 */ 
	glBindTexture(GL_TEXTURE_2D, m_texture[3].ID); 
	glBegin(GL_QUADS);		 
		 
		/** 指定纹理坐标和顶点坐标 */ 
		glTexCoord2f(1.0f, 1.0f);  glVertex3f( -width,  height,	-length);		 
		glTexCoord2f(0.0f, 1.0f);  glVertex3f( -width,  height,  length);  
		glTexCoord2f(0.0f, 0.0f);  glVertex3f( -width, -height,  length); 
		glTexCoord2f(1.0f, 0.0f);  glVertex3f( -width, -height, -length);	 
		 
	glEnd(); 
 
	/** 绘制右面 */ 
	glBindTexture(GL_TEXTURE_2D, m_texture[4].ID); 
	glBegin(GL_QUADS);		 
 
		/** 指定纹理坐标和顶点坐标 */ 
		glTexCoord2f(0.0f, 0.0f); glVertex3f( width, -height, -length); 
		glTexCoord2f(1.0f, 0.0f); glVertex3f( width, -height,  length); 
		glTexCoord2f(1.0f, 1.0f); glVertex3f( width,  height,  length);  
		glTexCoord2f(0.0f, 1.0f); glVertex3f( width,  height, -length); 
	glEnd(); 
	 
 
    glPopMatrix();                 /** 绘制结束 */ 
 
	if(lp)                         /** 恢复光照状态 */   
		glEnable(GL_LIGHTING); 
 
	glDisable(GL_TEXTURE_2D); 
 
	 yRot += 0.01f; 
	 if(yRot > 360.0f) 
		 yRot = 0.0f; 
 
	 
 
}