OpenGL Example

Vdo OpenGL example

code

#include <windows.h> 
#include <GL/gl.h> 
#include <GL/glu.h> 
#include <GL/glut.h> 
#include <stdio.h>

init
void init(void)
{
    float mat_specular[] = {1.0, 1.0, 1.0, 1.0};
    float mat_shininess[] = {50.0};
    float light_position[] = {1.0, 1.0, 1.0, 0.0};
    float light_ambient[] = {0.5, 0.5, 0.5, 1.0};
    glLightfv(GL_LIGHT0, GL_POSITION, light_position);
    glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
    glEnable(GL_LIGHT0);
    glEnable(GL_LIGHTING);
    glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
    glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);
    glColorMaterial(GL_FRONT_AND_BACK,  
    GL_AMBIENT_AND_DIFFUSE);
    glEnable(GL_COLOR_MATERIAL);
    glEnable(GL_DEPTH_TEST);
    glClearColor(0.0, 0.0, 0.0, 0.0);
theObj = gluNewQuadric();
}

display

void display(void) 

 { 

   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);      

   .........

   .....

}

 reshape
void reshape(int w, int h)
{
    glViewport(0, 0, w, h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    if(w<=h && w>0)
      glOrtho(-SIZEW,SIZEW,(GLdouble)-h/w*SIZEW,
   (GLdouble)h/w*SIZEW,0.0,2*SIZEW);
    else if(h>0)
      glOrtho((GLdouble)-w/h*SIZEW,(GLdouble)w/h*SIZEW,
    -SIZEW,SIZEW,0.0,2*SIZEW);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glTranslatef(0.0,0.0,-SIZEW);
}

keyboard
void keyboard(unsigned char key, int x, int y)
{
    switch(key){
      case 'q':
        exit(0);
        break;
      case 'f':
        glutFullScreen();
        break;
      case 'w':
        glutReshapeWindow(640, 480);
        break;
       }
}

Mouse
void Mouse(int x, int y)
{
if (GLUT_LEFT_BUTTON == GLUT_DOWN)
{
Y = y++%360;
X = x++%360;
    }

glutPostRedisplay();

}

main
void main (int argc, char** argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
    glutInitWindowSize(640, 480);
    glutCreateWindow(argv[0]);
    init();
    glutReshapeFunc(reshape);
    glutMotionFunc(Mouse);
    glutKeyboardFunc(keyboard);
    glutDisplayFunc(display);
    glutIdleFunc(display);
    glutMainLoop();
}