www.pudn.com > openglbk.rar > scene.c

/* 
 * Copyright (c) 1993-1999, Silicon Graphics, Inc. 
 * ALL RIGHTS RESERVED  
 * Permission to use, copy, modify, and distribute this software for  
 * any purpose and without fee is hereby granted, provided that the above 
 * copyright notice appear in all copies and that both the copyright notice 
 * and this permission notice appear in supporting documentation, and that  
 * the name of Silicon Graphics, Inc. not be used in advertising 
 * or publicity pertaining to distribution of the software without specific, 
 * written prior permission.  
 * 
 * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS" 
 * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR 
 * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON 
 * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT, 
 * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY 
 * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION, 
 * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF 
 * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN 
 * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON 
 * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE 
 * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE. 
 *  
 * US Government Users Restricted Rights  
 * Use, duplication, or disclosure by the Government is subject to 
 * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph 
 * (c)(1)(ii) of the Rights in Technical Data and Computer Software 
 * clause at DFARS 252.227-7013 and/or in similar or successor 
 * clauses in the FAR or the DOD or NASA FAR Supplement. 
 * Unpublished-- rights reserved under the copyright laws of the 
 * United States.  Contractor/manufacturer is Silicon Graphics, 
 * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311. 
 * 
 * OpenGL(R) is a registered trademark of Silicon Graphics, Inc. 
 */ 
 
/* 
 *  scene.c 
 *  This program demonstrates the use of the GL lighting model. 
 *  Objects are drawn using a grey material characteristic.  
 *  A single light source illuminates the objects. 
 */ 
#include  
#include  
 
/*  Initialize material property and light source. 
 */ 
void init (void) 
{ 
   GLfloat light_ambient[] = { 0.0, 0.0, 0.0, 1.0 }; 
   GLfloat light_diffuse[] = { 1.0, 1.0, 1.0, 1.0 }; 
   GLfloat light_specular[] = { 1.0, 1.0, 1.0, 1.0 }; 
/*	light_position is NOT default value	*/ 
   GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 }; 
 
   glLightfv (GL_LIGHT0, GL_AMBIENT, light_ambient); 
   glLightfv (GL_LIGHT0, GL_DIFFUSE, light_diffuse); 
   glLightfv (GL_LIGHT0, GL_SPECULAR, light_specular); 
   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); 
 
   glPushMatrix (); 
   glRotatef (20.0, 1.0, 0.0, 0.0); 
 
   glPushMatrix (); 
   glTranslatef (-0.75, 0.5, 0.0);  
   glRotatef (90.0, 1.0, 0.0, 0.0); 
   glutSolidTorus (0.275, 0.85, 15, 15); 
   glPopMatrix (); 
 
   glPushMatrix (); 
   glTranslatef (-0.75, -0.5, 0.0);  
   glRotatef (270.0, 1.0, 0.0, 0.0); 
   glutSolidCone (1.0, 2.0, 15, 15); 
   glPopMatrix (); 
 
   glPushMatrix (); 
   glTranslatef (0.75, 0.0, -1.0);  
   glutSolidSphere (1.0, 15, 15); 
   glPopMatrix (); 
 
   glPopMatrix (); 
   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 27: 
         exit(0); 
         break; 
   } 
} 
 
/*  Main Loop 
 *  Open window with initial window size, title bar,  
 *  RGBA display mode, and handle input events. 
 */ 
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); 
   glutDisplayFunc(display); 
   glutKeyboardFunc (keyboard); 
   glutMainLoop(); 
   return 0;  
}