linux下opengl

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//编译指令 gcc samplegl.c -osamplegl -lglut

# include <GL/glut.h>
# include <stdlib.h>


void init ( void )
{
   GLfloat mat_specular [ ] = { 1.0, 1.0, 1.0, 1.0 };
     GLfloat mat_shininess [ ] = { 50.0 };
     GLfloat light_position [ ] = { 1.0, 1.0, 1.0, 0.0 };

     glClearColor ( 0.0, 0.0, 0.0, 0.0 );
     glShadeModel ( GL_SMOOTH );

     glMaterialfv ( GL_FRONT, GL_SPECULAR, mat_specular);
     glMaterialfv ( GL_FRONT, GL_SHININESS, mat_shininess);
     glLightfv ( GL_LIGHT0, GL_POSITION, light_position);

     glEnable (GL_LIGHTING);
     glEnable (GL_LIGHT0);
     glEnable (GL_DEPTH_TEST);
}

void display ( void )
{
     glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
     glutSolidSphere (1.0, 40, 50);
     glFlush ();
}

void reshape (int w, int h)
{
     glViewport (0, 0, (GLsizei) w, (GLsizei) h);
     glMatrixMode (GL_PROJECTION);
     glLoadIdentity ( );
     if (w <= h)
         glOrtho (-1.5, 1.5, -1.5 * ( GLfloat ) h / ( GLfloat ) w, 1.5 * ( GLfloat ) h / ( GLfloat ) w, -10.0, 10.0 );
     else
         glOrtho (-1.5 * ( GLfloat ) w / ( GLfloat ) h, 1.5 * ( GLfloat ) w / ( GLfloat ) h, -1.5, 1.5, -10.0, 10.0);
     glMatrixMode ( GL_MODELVIEW );
     glLoadIdentity ( ) ;
}

void keyboard ( unsigned char key, int x, int y)
{

     switch (key)
     {
         case 27:
         exit ( 0 );
         break;
     }
}

int main(int argc, char** argv)
{

     glutInit (&argc, argv);

     glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);

     glutInitWindowSize (300, 300);

     glutInitWindowPosition (100, 100);

     glutCreateWindow ( argv [ 0 ] );

     init ( );

     glutDisplayFunc ( display );

     glutReshapeFunc ( reshape );

     glutKeyboardFunc ( keyboard );

     glutMainLoop( );
     return 0;
}

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