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// SkyBox.cpp: implementation of the CSkyBox class. 
// 
////////////////////////////////////////////////////////////////////// 
#include "stdafx.h" 
#include "Texture.h" 
#include "SkyBox.h" 
////////////////////////////////////////////////////////////////////// 
// Construction/Destruction 
////////////////////////////////////////////////////////////////////// 
 
CSkyBox::CSkyBox() 
{ 
} 
CSkyBox::~CSkyBox() 
{ 
	for(int i=0;i<5;i++) 
	    glDeleteTextures(1,&texSky[i]); 
} 
 
bool CSkyBox::LoadSkyTexture() 
{ 
	CTexture Texture; 
	char filename[64]; 
	for(int i=0;i<5;i++) 
	{ 
		wsprintf(filename,"sky/skyb%d.bmp",i); 
        if(!Texture.MakeTextureBind(filename,&texSky[i],1,0)) 
	    	return false; 
 	} 
	return true;	 
} 
 
bool CSkyBox::InitSkyBox(int XLenght, int YLenght,int ZLenght, 
				 int CenterX,int CenterY,int CenterZ) 
{ 
	m_XLength=XLenght; 
	m_YLength=YLenght; 
	m_ZLength=ZLenght; 
	m_CenterX=CenterX; 
	m_CenterY=CenterY; 
	m_CenterZ=CenterZ; 
 
	if(!LoadSkyTexture())return false; 
	return true; 
} 
void CSkyBox::DrawSkyBox() 
{ 
	int lx,ly,lz,cx,cy,cz; 
	lx=m_XLength; 
	ly=m_YLength; 
	lz=m_ZLength; 
	cx=m_CenterX; 
	cy=m_CenterY; 
	cz=m_CenterZ; 
 
	float btmy=0.0f;//This variable indicate how much texture should be cut from 0 to btmy 
//   	glDisable(GL_FOG);  
	////////front 
 	glBindTexture(GL_TEXTURE_2D, texSky[0]); 
   	glEnable(GL_TEXTURE_2D);  
  		glBegin(GL_QUADS); 
	            glTexCoord2f(0,btmy); 
			    glVertex3i(-lx+cx, cy,   -lz+cz); 
 
    	        glTexCoord2f(1,btmy); 
			    glVertex3i(lx+cx, cy,   -lz+cz); 
 
	            glTexCoord2f(1,1); 
			    glVertex3i(lx+cx, ly+cy,   -lz+cz); 
 
	            glTexCoord2f(0,1); 
			    glVertex3i(-lx+cx, ly+cy,    -lz+cz); 
            glEnd(); 
	glDisable(GL_TEXTURE_2D);  
	///     ////////////////sky1 
	/////////////////right 
	glBindTexture(GL_TEXTURE_2D, texSky[1]); 
   	glEnable(GL_TEXTURE_2D);  
   
		glBegin(GL_QUADS); 
	            glTexCoord2f(0,btmy); 
			    glVertex3i(lx+cx, cy,    -lz+cz); 
 
    	        glTexCoord2f(1,btmy); 
			    glVertex3i(lx+cx, cy,    lz+cz); 
 
	            glTexCoord2f(1,1); 
			    glVertex3i(lx+cx, ly+cy,    lz+cz); 
 
	            glTexCoord2f(0,1); 
			    glVertex3i(lx+cx, ly+cy,    -lz+cz); 
            glEnd(); 
	glDisable(GL_TEXTURE_2D);  
	///     ////////////////sky2 
	//////////////back 
	glBindTexture(GL_TEXTURE_2D, texSky[2]); 
   	glEnable(GL_TEXTURE_2D);  
  
		glBegin(GL_QUADS); 
	            glTexCoord2f(0,btmy); 
			    glVertex3i(lx+cx, cy,    lz+cz); 
 
    	        glTexCoord2f(1,btmy); 
			    glVertex3i(-lx+cx, cy,    lz+cz); 
 
	            glTexCoord2f(1,1); 
			    glVertex3i(-lx+cx, ly+cy,    lz+cz); 
 
	            glTexCoord2f(0,1); 
			    glVertex3i(lx+cx, ly+cy,    lz+cz); 
            glEnd(); 
	glDisable(GL_TEXTURE_2D);  
	///     ////////////////sky3 
	////////////////left 
	glBindTexture(GL_TEXTURE_2D, texSky[3]); 
   	glEnable(GL_TEXTURE_2D);  
	       glBegin(GL_QUADS); 
	            glTexCoord2f(0,btmy); 
			    glVertex3i(-lx+cx, cy,    lz+cz); 
 
    	        glTexCoord2f(1,btmy); 
			    glVertex3i(-lx+cx, cy,    -lz+cz); 
 
	            glTexCoord2f(1,1); 
			    glVertex3i(-lx+cx, ly+cy,    -lz+cz); 
 
	            glTexCoord2f(0,1); 
			    glVertex3i(-lx+cx, ly+cy,    lz+cz); 
            glEnd(); 
	glDisable(GL_TEXTURE_2D);  
	///     ////////////////sky4 
	/////////////up 
	glBindTexture(GL_TEXTURE_2D, texSky[4]); 
   	glEnable(GL_TEXTURE_2D);  
 
		glBegin(GL_QUADS); 
	            glTexCoord2f(0,0); 
			    glVertex3i(-lx+cx, ly+cy,    -lz+cz); 
 
    	        glTexCoord2f(1,0); 
			    glVertex3i(lx+cx,ly+cy,    -lz+cz); 
 
	            glTexCoord2f(1,1); 
			    glVertex3i(lx+cx, ly+cy,    lz+cz); 
 
	            glTexCoord2f(0,1); 
			    glVertex3i(-lx+cx, ly+cy,    lz+cz); 
            glEnd(); 
	glDisable(GL_TEXTURE_2D); 
  // 	glEnable(GL_FOG);  
}