www.pudn.com > openglbk.rar > colormat.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 * Unpublished-- rights reserved under the copyright laws of the 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. 
 */ 
 
/* 
 *  colormat.c 
 *  After initialization, the program will be in 
 *  ColorMaterial mode.  Interaction:  pressing the  
 *  mouse buttons will change the diffuse reflection values. 
 */ 
#include  
#include  
 
GLfloat diffuseMaterial[4] = { 0.5, 0.5, 0.5, 1.0 }; 
 
/*  Initialize material property, light source, lighting model, 
 *  and depth buffer. 
 */ 
void init(void)  
{ 
   GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 }; 
   GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 }; 
 
   glClearColor (0.0, 0.0, 0.0, 0.0); 
   glShadeModel (GL_SMOOTH); 
   glEnable(GL_DEPTH_TEST); 
   glMaterialfv(GL_FRONT, GL_DIFFUSE, diffuseMaterial); 
   glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular); 
   glMaterialf(GL_FRONT, GL_SHININESS, 25.0); 
   glLightfv(GL_LIGHT0, GL_POSITION, light_position); 
   glEnable(GL_LIGHTING); 
   glEnable(GL_LIGHT0); 
 
   glColorMaterial(GL_FRONT, GL_DIFFUSE); 
   glEnable(GL_COLOR_MATERIAL); 
} 
 
void display(void) 
{ 
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 
   glutSolidSphere(1.0, 20, 16); 
   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 mouse(int button, int state, int x, int y) 
{ 
   switch (button) { 
      case GLUT_LEFT_BUTTON: 
         if (state == GLUT_DOWN) { 
            diffuseMaterial[0] += 0.1; 
            if (diffuseMaterial[0] > 1.0) 
               diffuseMaterial[0] = 0.0; 
            glColor4fv(diffuseMaterial); 
            glutPostRedisplay(); 
         } 
         break; 
      case GLUT_MIDDLE_BUTTON: 
         if (state == GLUT_DOWN) { 
            diffuseMaterial[1] += 0.1; 
            if (diffuseMaterial[1] > 1.0) 
               diffuseMaterial[1] = 0.0; 
            glColor4fv(diffuseMaterial); 
            glutPostRedisplay(); 
         } 
         break; 
      case GLUT_RIGHT_BUTTON: 
         if (state == GLUT_DOWN) { 
            diffuseMaterial[2] += 0.1; 
            if (diffuseMaterial[2] > 1.0) 
               diffuseMaterial[2] = 0.0; 
            glColor4fv(diffuseMaterial); 
            glutPostRedisplay(); 
         } 
         break; 
      default: 
         break; 
   } 
} 
 
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 (500, 500);  
   glutInitWindowPosition (100, 100); 
   glutCreateWindow (argv[0]); 
   init (); 
   glutDisplayFunc(display);  
   glutReshapeFunc(reshape); 
   glutMouseFunc(mouse); 
   glutKeyboardFunc(keyboard); 
   glutMainLoop(); 
   return 0; 
}