游戏引擎

开发平台：
Visual C++

LensFlare.cpp：源码内容
							// LensFlare.cpp: implementation of the CLensFlare class.
//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "LensFlare.h"
#include "texture.h"
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CLensFlare::CLensFlare()
{
}
CLensFlare::~CLensFlare()
{
}
bool CLensFlare::InitLensFlare()
{
	CTexture cTexture;
	char filename[64];
   	for(int i=0;i<7;i++)
	{
		wsprintf(filename,"flare/flare%d.bmp",i);
	    if(!cTexture.MakeAlphaTextureBind(filename,&m_texFlare[i]))return false;
	}
	m_LightPos=VERTEX(128000,30000,-72000);
    m_cHmap.m_pSunPos->xpos= m_LightPos.xpos;
    m_cHmap.m_pSunPos->ypos= m_LightPos.ypos;
	m_cHmap.m_pSunPos->zpos= m_LightPos.zpos;
    return true;
}
void CLensFlare::UpdateLensFlare()
{
	if(!CheckLightVisible())
	{
		m_cHmap.m_bSunVisible=true; //restore
		return;
	}
    m_cHmap.m_bSunVisible=true; //restore
	float size=0.06f;
    float offset=1;
//	glAlphaFunc(GL_GEQUAL,0.25f);
	glDisable(GL_DEPTH_TEST);
	glBlendFunc(GL_SRC_ALPHA,GL_ONE);
	glEnable(GL_BLEND);
   	glEnable(GL_TEXTURE_2D); 
    glPushMatrix();	
	glTranslatef(m_cHmap.m_pViewPos->xpos,m_cHmap.m_pViewPos->ypos,m_cHmap.m_pViewPos->zpos);
  	glRotatef(*m_cHmap.m_pViewRotY,  0.0f,1.0f,0.0f);
	glRotatef(-*m_cHmap.m_pViewRotX,  1.0f,0.0f,0.0f);
    /////////////////////1
	glBindTexture(GL_TEXTURE_2D, m_texFlare[1]);
	glColor3f(0.05f,0.3f,0.5f);
	offset=1.3f;
	size=0.08f;
  	glBegin(GL_QUADS);
	    glTexCoord2f(0,0);
		glVertex3f(sx*offset-size,sy*offset-size,-1.03923f);
    	glTexCoord2f(1,0);
		glVertex3f(sx*offset+size,sy*offset-size,-1.03923f);
	    glTexCoord2f(1,1);
		glVertex3f(sx*offset+size,sy*offset+size,-1.03923f);
	    glTexCoord2f(0,1);
		glVertex3f(sx*offset-size,sy*offset+size,-1.03923f);
    glEnd();	
    /////////////////////2
	glBindTexture(GL_TEXTURE_2D, m_texFlare[2]);
	glColor3f(0.0f,0.3f,0.5f);
	
	offset=0.7f;
	size=0.03f;
  	glBegin(GL_QUADS);
	    glTexCoord2f(0,0);
		glVertex3f(sx*offset-size,sy*offset-size,-1.03923f);
    	glTexCoord2f(1,0);
		glVertex3f(sx*offset+size,sy*offset-size,-1.03923f);
	    glTexCoord2f(1,1);
		glVertex3f(sx*offset+size,sy*offset+size,-1.03923f);
	    glTexCoord2f(0,1);
		glVertex3f(sx*offset-size,sy*offset+size,-1.03923f);
    glEnd();	
    /////////////////////3
	glBindTexture(GL_TEXTURE_2D, m_texFlare[3]);
	glColor3f(0.05f,0.3f,0.5f);
	 
	offset=0.5f;
	size=0.04f;
  	glBegin(GL_QUADS);
	    glTexCoord2f(0,0);
		glVertex3f(sx*offset-size,sy*offset-size,-1.03923f);
    	glTexCoord2f(1,0);
		glVertex3f(sx*offset+size,sy*offset-size,-1.03923f);
	    glTexCoord2f(1,1);
		glVertex3f(sx*offset+size,sy*offset+size,-1.03923f);
	    glTexCoord2f(0,1);
		glVertex3f(sx*offset-size,sy*offset+size,-1.03923f);
    glEnd();	
    /////////////////////4
	glBindTexture(GL_TEXTURE_2D, m_texFlare[4]);
	glColor3f(0.4f,0.1f,0.0f);
	 
	offset=0.1f;
	size=0.06f;
  	glBegin(GL_QUADS);
	    glTexCoord2f(0,0);
		glVertex3f(sx*offset-size,sy*offset-size,-1.03923f);
    	glTexCoord2f(1,0);
		glVertex3f(sx*offset+size,sy*offset-size,-1.03923f);
	    glTexCoord2f(1,1);
		glVertex3f(sx*offset+size,sy*offset+size,-1.03923f);
	    glTexCoord2f(0,1);
		glVertex3f(sx*offset-size,sy*offset+size,-1.03923f);
    glEnd();	
    /////////////////////5
	glBindTexture(GL_TEXTURE_2D, m_texFlare[5]);
	glColor3f(0.3f,0.05f,0.0f);
	 
	offset=-0.3f;
	size=0.12f;
  	glBegin(GL_QUADS);
	    glTexCoord2f(0,0);
		glVertex3f(sx*offset-size,sy*offset-size,-1.03923f);
    	glTexCoord2f(1,0);
		glVertex3f(sx*offset+size,sy*offset-size,-1.03923f);
	    glTexCoord2f(1,1);
		glVertex3f(sx*offset+size,sy*offset+size,-1.03923f);
	    glTexCoord2f(0,1);
		glVertex3f(sx*offset-size,sy*offset+size,-1.03923f);
    glEnd();	
    /////////////////////6
	glBindTexture(GL_TEXTURE_2D, m_texFlare[6]);
	glColor3f(0.3f,0.0f,0.0f);
	 
	offset=-0.9f;
	size=0.14f;
  	glBegin(GL_QUADS);
	    glTexCoord2f(0,0);
		glVertex3f(sx*offset-size,sy*offset-size,-1.03923f);
    	glTexCoord2f(1,0);
		glVertex3f(sx*offset+size,sy*offset-size,-1.03923f);
	    glTexCoord2f(1,1);
		glVertex3f(sx*offset+size,sy*offset+size,-1.03923f);
	    glTexCoord2f(0,1);
		glVertex3f(sx*offset-size,sy*offset+size,-1.03923f);
    glEnd();	
	////////////////////////////////////////////////
	/////////////////////Draw light Shine
	
	glBindTexture(GL_TEXTURE_2D, m_texFlare[0]);
	glTranslatef(sx,sy,0);
    glRotatef((*m_cHmap.m_pViewRotY+*m_cHmap.m_pViewRotX)*2,  0.0f,0.0f,1.0f);
	glColor3f(0.7f,0.4f,0.0f);
	size=0.15f;
  	glBegin(GL_QUADS);
	    glTexCoord2f(0,0);
		glVertex3f(-size,-size,-1.03923f);
    	glTexCoord2f(1,0);
		glVertex3f(+size,-size,-1.03923f);
	    glTexCoord2f(1,1);
		glVertex3f(+size,+size,-1.03923f);
	    glTexCoord2f(0,1);
		glVertex3f(-size,+size,-1.03923f);
    glEnd();	
	////////////////////////////////////////////////
	glColor3f(1,1,1);
glPopMatrix();
	glDisable(GL_BLEND);
	glDisable(GL_ALPHA_TEST);
}
bool CLensFlare::CheckLightVisible()
{
	VERTEX v0=VERTEX(m_LightPos.xpos-m_cHmap.m_pViewPos->xpos,
		             m_LightPos.ypos-m_cHmap.m_pViewPos->ypos,
					 m_LightPos.zpos-m_cHmap.m_pViewPos->zpos);
	float rotx=*m_cHmap.m_pViewRotX;
	float roty=*m_cHmap.m_pViewRotY;
	//////// y rotate
    VERTEX v1=VERTEX(v0.xpos*cosf(roty*0.0174533f)-
		             v0.zpos*sinf(roty*0.0174533f),
			         v0.ypos,
                     v0.xpos*sinf(roty*0.0174533f)+
		             v0.zpos*cosf(roty*0.0174533f));
    //////// x rotate
    VERTEX v2=VERTEX(v1.xpos,
		             v1.ypos*cosf(rotx*0.0174533f)-
		             v1.zpos*sinf(rotx*0.0174533f),
                     v1.ypos*sinf(rotx*0.0174533f)+
		             v1.zpos*cosf(rotx*0.0174533f));
	////////////////////
	if(v2.zpos>-1)return false;
	double scale=-1.03923/v2.zpos;
	sx=float(v2.xpos*scale);
	sy=float(v2.ypos*scale);
	if(sx>0.8f || sx<-0.8f)return false;
	if(sy>0.6f || sy<-0.6f)return false;
	//////// Check Visible
    if(!m_cHmap.CheckSunVisible())
        return false;
    return true;
}

						