www.pudn.com > MY_LOD.rar > Lod.cpp

// Lod.cpp: implementation of the CLod class. 
// 
////////////////////////////////////////////////////////////////////// 
 
#include "stdafx.h" 
#include "MY_LOD.h" 
#include "Lod.h" 
#include "math.h" 
#include "BMPLoad.h" 
#include "LandTex.h" 
 
#ifdef _DEBUG 
#undef THIS_FILE 
static char THIS_FILE[]=__FILE__; 
#define new DEBUG_NEW 
#endif 
extern int quadtree[]; 
extern int location[]; 
extern int lod_lever; 
extern int* y; 
extern CLandTex lt; 
////////////////////////////////////////////////////////////////////// 
// Construction/Destruction 
////////////////////////////////////////////////////////////////////// 
 
CLod::CLod() 
{ 
 
} 
 
CLod::~CLod() 
{ 
 
} 
 
void CLod::reset_quad_tree() 
{ 
	int i; 
	for(i=0;i<(QUAD_MAP*QUAD_MAP);i++) { 
		quadtree[i]=UNKNOWN; 
	} 
} 
 
 
 
void CLod::setup_quadtree(int x, int z, int width) 
{ 
	int width2; 
	int v1[3]; 
	v1[0]=x; 
	v1[2]=z; 
	width2=width/2; 
	if ((width>1)&&DISTANCE(v1,location)1) { 
		if(width > 16) { 
			glBindTexture(GL_TEXTURE_2D, lt.texture_name[(int)((x) / 64)][(int)((z) / 64)]); 
		} 
		width2=width/2; 
		if (quadtree[IX_QT(x,z)]==NODE_POINT) { 
			//NORTH 
			if (quadtree[IX_QT(x-width2,z-width2)]==EDGE_POINT&& 
				quadtree[IX_QT(x+width2,z-width2)]==EDGE_POINT) { 
				if (quadtree[IX_QT(x,z-2*width)]==NODE_POINT||(z-width)%MAP==0) { 
					draw_point(x,z,width,NORTH_L); 
				    draw_point(x,z,width,NORTH_R); 
				} 
			    else { 
					draw_point(x,z,width,NORTH); 
				} 
			} 
			else if (quadtree[IX_QT(x-width2,z-width2)]==EDGE_POINT) { 
				draw_point(x,z,width,NORTH_L); 
			} 
			else if (quadtree[IX_QT(x+width2,z-width2)]==EDGE_POINT) { 
				draw_point(x,z,width,NORTH_R); 
			} 
			//SOUTH 
			if (quadtree[IX_QT(x-width2,z+width2)]==EDGE_POINT&& 
				quadtree[IX_QT(x+width2,z+width2)]==EDGE_POINT) { 
				if (quadtree[IX_QT(x,z+2*width)]==NODE_POINT||(z+width)%MAP==0) { 
					draw_point(x,z,width,SOUTH_L); 
					draw_point(x,z,width,SOUTH_R); 
				} 
				else { 
					draw_point(x,z,width,SOUTH); 
				} 
			} 
			else if (quadtree[IX_QT(x-width2,z+width2)]==EDGE_POINT) { 
				draw_point(x,z,width,SOUTH_L); 
			} 
			else if (quadtree[IX_QT(x+width2,z+width2)]==EDGE_POINT) { 
				draw_point(x,z,width,SOUTH_R); 
			} 
			//EAST 
			if (quadtree[IX_QT(x+width2,z+width2)]==EDGE_POINT&& 
				quadtree[IX_QT(x+width2,z-width2)]==EDGE_POINT) { 
				if (quadtree[IX_QT(x+2*width,z)]==NODE_POINT||(x+width)%MAP==0) { 
					draw_point(x,z,width,EAST_T); 
				    draw_point(x,z,width,EAST_B); 
				} 
				else { 
					draw_point(x,z,width,EAST); 
				} 
			} 
			else if (quadtree[IX_QT(x+width2,z-width2)]==EDGE_POINT) { 
				draw_point(x,z,width,EAST_T); 
			} 
			else if (quadtree[IX_QT(x+width2,z+width2)]==EDGE_POINT) { 
				draw_point(x,z,width,EAST_B); 
			} 
			//WEST 
			if (quadtree[IX_QT(x-width2,z-width2)]==EDGE_POINT&& 
				quadtree[IX_QT(x-width2,z+width2)]==EDGE_POINT) { 
				if (quadtree[IX_QT(x-2*width,z)]==NODE_POINT||(x-width)%MAP==0) { 
					draw_point(x,z,width,WEST_T); 
					draw_point(x,z,width,WEST_B); 
				} 
				else { 
					draw_point(x,z,width,WEST); 
				} 
			} 
			else if (quadtree[IX_QT(x-width2,z-width2)]==EDGE_POINT) { 
				draw_point(x,z,width,WEST_T); 
			} 
			else if (quadtree[IX_QT(x-width2,z+width2)]==EDGE_POINT) { 
				draw_point(x,z,width,WEST_B); 
			} 
		} 
		else { 
			return; 
		} 
		draw(x-width2,z-width2,width2,NW); 
		draw(x+width2,z-width2,width2,NE); 
		draw(x-width2,z+width2,width2,SW); 
		draw(x+width2,z+width2,width2,SE); 
	} 
} 
 
void CLod::draw_point(int x, int z, int width, int direction) 
{ 
	switch(direction) { 
	case NORTH: 
		if (m_bFlag)  
			triangle1(x,z,x+width,z-width,x-width,z-width); 
		else 
			triangle2(x,z,x+width,z-width,x-width,z-width); 
		break; 
	case SOUTH: 
		if (m_bFlag)  
			triangle1(x,z,x-width,z+width,x+width,z+width); 
		else 
			triangle2(x,z,x-width,z+width,x+width,z+width); 
		break; 
	case EAST: 
		if (m_bFlag)  
			triangle1(x,z,x+width,z+width,x+width,z-width); 
		else 
			triangle2(x,z,x+width,z+width,x+width,z-width); 
		break; 
	case WEST: 
		if (m_bFlag)  
			triangle1(x,z,x-width,z-width,x-width,z+width); 
		else 
			triangle2(x,z,x-width,z-width,x-width,z+width); 
		break; 
	case NORTH_L: 
		if (m_bFlag) 
			triangle1(x,z,x,z-width,x-width,z-width); 
		else 
			triangle2(x,z,x,z-width,x-width,z-width); 
		break; 
	case NORTH_R: 
		if (m_bFlag)  
			triangle1(x,z,x+width,z-width,x,z-width); 
		else 
			triangle2(x,z,x+width,z-width,x,z-width); 
		break; 
	case SOUTH_L: 
		if (m_bFlag) 
			triangle1(x,z,x-width,z+width,x,z+width); 
		else 
			triangle2(x,z,x-width,z+width,x,z+width); 
		break; 
	case SOUTH_R: 
		if (m_bFlag)  
			triangle1(x,z,x,z+width,x+width,z+width); 
		else 
			triangle2(x,z,x,z+width,x+width,z+width); 
		break; 
	case EAST_T: 
		if (m_bFlag)  
			triangle1(x,z,x+width,z,x+width,z-width); 
		else 
			triangle2(x,z,x+width,z,x+width,z-width); 
		break; 
	case EAST_B: 
		if (m_bFlag)  
			triangle1(x,z,x+width,z+width,x+width,z); 
		else 
			triangle2(x,z,x+width,z+width,x+width,z); 
		break; 
	case WEST_T: 
		if (m_bFlag)  
			triangle1(x,z,x-width,z-width,x-width,z); 
		else 
			triangle2(x,z,x-width,z-width,x-width,z); 
		break; 
	case WEST_B: 
		if (m_bFlag)  
			triangle1(x,z,x-width,z,x-width,z+width); 
		else 
			triangle2(x,z,x-width,z,x-width,z+width); 
		break; 
	default: 
		break; 
	} 
} 
 
void CLod::triangle1(int x1, int z1, int x2, int z2, int x3, int z3) 
{ 
	glBegin(GL_TRIANGLES); 
	    glColor3f(1,1,1); 
		setVertex(x1,z1); 
		glColor3f(0,0,0); 
		setVertex(x2,z2); 
		glColor3f(0,0,0); 
		setVertex(x3,z3); 
	glEnd(); 
} 
 
void CLod::triangle2(int x1, int z1, int x2, int z2, int x3, int z3) 
{ 
	glBegin(GL_LINE_LOOP); 
		setVertex(x1,z1); 
		setVertex(x2,z2); 
		setVertex(x3,z3); 
	glEnd(); 
} 
 
void CLod::setVertex(int x, int z) 
{ 
	glVertex3f((x<