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Tutorials List

Display Lists Tutorial

Index

Introduction
Without Display Lists
Creating a DL
The Greedy Approach
Using Nested Display Lists
Other Considerations

Visual C++ project





// -----------------------------------
// Version: Hierarchical Display lists
// Antonio Ramires Fernandes
// www.lighthouse3d.com/
// -----------------------------------

#include 

#include 
#include 

float angle=0.0;
float x=0.0f,y=1.75f,z=5.0f;
float lx=0.0f,ly=0.0f,lz=-1.0f;
float ratio=1.0;
int frame,time,timebase=0;
char s[30];

GLuint DLid;

GLuint createDL(void);

void changeSize(int w, int h)	{

	// Prevent a divide by zero, when window is too short
	// (you cant make a window of zero width).
	if(h == 0)
		h = 1;

	ratio = 1.0f * w / h;
	// Reset the coordinate system before modifying
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	
	// Set the viewport to be the entire window
	glViewport(0, 0, w, h);

	// Set the clipping volume
	gluPerspective(45,ratio,1,1000);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	gluLookAt(x, y, z, 
		      x + lx,y + ly,z + lz,
			  0.0f,1.0f,0.0f);
}

void initScene() {

	glEnable(GL_DEPTH_TEST);
	DLid = createDL();
}


void drawSnowMan() {


	glColor3f(1.0f, 1.0f, 1.0f);

// Draw Body	
	glTranslatef(0.0f ,0.75f, 0.0f);
	glutSolidSphere(0.75f,20,20);


// Draw Head
	glTranslatef(0.0f, 1.0f, 0.0f);
	glutSolidSphere(0.25f,20,20);

// Draw Eyes
	glPushMatrix();
	glColor3f(0.0f,0.0f,0.0f);
	glTranslatef(0.05f, 0.10f, 0.18f);
	glutSolidSphere(0.05f,10,10);
	glTranslatef(-0.1f, 0.0f, 0.0f);
	glutSolidSphere(0.05f,10,10);
	glPopMatrix();

// Draw Nose
	glColor3f(1.0f, 0.5f , 0.5f);
	glRotatef(0.0f,1.0f, 0.0f, 0.0f);
	glutSolidCone(0.08f,0.5f,10,2);
}



GLuint createDL() {
	GLuint snowManDL,loopDL;

	snowManDL = glGenLists(1);
	loopDL = glGenLists(1);

	glNewList(snowManDL,GL_COMPILE);
		drawSnowMan();
	glEndList();

	glNewList(loopDL,GL_COMPILE);
	for(int i = -3; i < 3; i++)
		for(int j=-3; j < 3; j++) {
			glPushMatrix();
			glTranslatef(i*10.0,0,j * 10.0);
			glCallList(snowManDL);
			glPopMatrix();
		}
	glEndList();

	return(loopDL);
}


void renderScene(void) {
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

// Draw ground

	glColor3f(0.9f, 0.9f, 0.9f);
	glBegin(GL_QUADS);
		glVertex3f(-100.0f, 0.0f, -100.0f);
		glVertex3f(-100.0f, 0.0f,  100.0f);
		glVertex3f( 100.0f, 0.0f,  100.0f);
		glVertex3f( 100.0f, 0.0f, -100.0f);
	glEnd();

// Draw 36 SnowMen

	glCallList(DLid);
	frame++;
	time=glutGet(GLUT_ELAPSED_TIME);
	if (time - timebase > 1000) {
		sprintf(s,"FPS:%4.2f",frame*1000.0/(time-timebase));
		glutSetWindowTitle(s);
		timebase = time;		
		frame = 0;
	}
	glutSwapBuffers();
}

void orientMe(float ang) {


	lx = sin(ang);
	lz = -cos(ang);
	glLoadIdentity();
	gluLookAt(x, y, z, 
		      x + lx,y + ly,z + lz,
			  0.0f,1.0f,0.0f);
}


void moveMeFlat(int i) {
	x = x + i*(lx)*0.1;
	z = z + i*(lz)*0.1;

	glLoadIdentity();
	gluLookAt(x, y, z, 
		      x + lx,y + ly,z + lz,
			  0.0f,1.0f,0.0f);
}


void inputKey(unsigned char c, int x, int y) {

	switch (c) {
		case 'a' : angle -= 0.01f;orientMe(angle);break;
		case 's' : angle +=0.01f;orientMe(angle);break;
		case 't' : moveMeFlat(1);break;
		case 'g' : moveMeFlat(-1);break;
	}
}


int main(int argc, char **argv)
{
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);
	glutInitWindowPosition(100,100);
	glutInitWindowSize(300,300);
	glutCreateWindow("SnowMen");

	initScene();

	glutKeyboardFunc(inputKey);

	glutDisplayFunc(renderScene);
	glutIdleFunc(renderScene);

	glutReshapeFunc(changeSize);

	glutMainLoop();

	return(0);
}
	

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