# include <iostream.h>
# include <stdio.h>
# include <windows.h>
# include <gl/gl.h>
# include <gl/glu.h>
# include <gl/glaux.h>
# include <gl/glut.h>
static GLint fogMode;
static void init(void)
{
GLfloat position[]={0.5, 0.5, 3.0, 0.0};
glEnable(GL_DEPTH_TEST);
glLightfv(GL_LIGHT0, GL_POSITION, position);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
{
GLfloat mat[3]={0.1745, 0.01175, 0.01175};
glMaterialfv(GL_FRONT, GL_AMBIENT, mat);
mat[0]=0.61424; mat[1]=0.04136; mat[2]=0.04136;
glMaterialfv(GL_FRONT, GL_DIFFUSE, mat);
mat[0]=.727811; mat[1]=0.626959; mat[2]=0.626959;
glMaterialfv(GL_FRONT, GL_SPECULAR, mat);
glMaterialf(GL_FRONT, GL_SHININESS, 0.6*128.0);
}
glEnable(GL_FOG);
{
GLfloat fogColor[4]={0.5, 0.5, 0.5, 1.0};
fogMode=GL_EXP;
glFogi(GL_FOG_MODE, fogMode);
glFogfv(GL_FOG_COLOR, fogColor);
glFogf(GL_FOG_DENSITY, 0.35);
glHint(GL_FOG_HINT, GL_DONT_CARE);
glFogf(GL_FOG_START, 1.0);
glFogf(GL_FOG_END, 5.0);
}
glClearColor(0.5, 0.5, 0.5, 1.0);
}
static void renderSphere(GLfloat x, GLfloat y, GLfloat z)
{
glPushMatrix();
glTranslatef(x, y, z);
glutSolidSphere(0.4, 16, 16);
glPopMatrix();
}
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
renderSphere(-2., -0.5, -1.0);
renderSphere(-1., -0.5, -2.0);
renderSphere(0., -0.5, -3.0);
renderSphere(1., -0.5, -4.0);
renderSphere(2., -0.5, -5.0);
glFlush();
}
void reshape(int w, int h)
{
glViewport(0, 0, (GLsizei) w, (GLsizei) h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if (w<=h)
glOrtho(-2.5, 2.5, -2.5*(GLfloat)h/(GLfloat)w,
2.5*(GLfloat)h/(GLfloat)w, -10.0, 10.0);
else
glOrtho(-2.5*(GLfloat)w/(GLfloat)h,
2.5*(GLfloat)w/(GLfloat)h, -2.5, 2.5, -10.0, 10.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void keyboard(unsigned char key, int x, int y)
{
switch (key) {
case 'a':
if (fogMode==GL_EXP) {
fogMode=GL_EXP2;
printf("Fog mode is GL_EXP2\n");
}
else if (fogMode==GL_EXP2) {
fogMode=GL_LINEAR;
printf("Fog mode is GL_LINEAR\n");
}
else if (fogMode==GL_LINEAR) {
fogMode=GL_EXP;
printf("Fog mode is GL_EXP\n");
}
glFogi(GL_FOG_MODE, fogMode);
glutPostRedisplay();
break;
case 27:
exit(0);
break;
default:
break;
}
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowSize(500, 500);
glutCreateWindow(argv[0]);
init();
glutReshapeFunc(reshape);
glutKeyboardFunc(keyboard);
glutDisplayFunc(display);
glutMainLoop();
return 0;
}
