www.pudn.com > openglbk.rar > varray.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 * Unpublished-- rights reserved under the copyright laws of the 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. 
 */ 
 
/* 
 *  varray.c 
 *  This program demonstrates vertex arrays. 
 */ 
#include  
#include  
#include  
 
#ifdef GL_VERSION_1_1 
#define POINTER 1 
#define INTERLEAVED 2 
 
#define DRAWARRAY 1 
#define ARRAYELEMENT  2 
#define DRAWELEMENTS 3 
 
int setupMethod = POINTER; 
int derefMethod = DRAWARRAY; 
 
void setupPointers(void) 
{ 
   static GLint vertices[] = {25, 25, 
                       100, 325, 
                       175, 25, 
                       175, 325, 
                       250, 25, 
                       325, 325}; 
   static GLfloat colors[] = {1.0, 0.2, 0.2, 
                       0.2, 0.2, 1.0, 
                       0.8, 1.0, 0.2, 
                       0.75, 0.75, 0.75, 
                       0.35, 0.35, 0.35, 
                       0.5, 0.5, 0.5}; 
 
   glEnableClientState (GL_VERTEX_ARRAY); 
   glEnableClientState (GL_COLOR_ARRAY); 
 
   glVertexPointer (2, GL_INT, 0, vertices); 
   glColorPointer (3, GL_FLOAT, 0, colors); 
} 
 
void setupInterleave(void) 
{ 
   static GLfloat intertwined[] = 
      {1.0, 0.2, 1.0, 100.0, 100.0, 0.0, 
       1.0, 0.2, 0.2, 0.0, 200.0, 0.0, 
       1.0, 1.0, 0.2, 100.0, 300.0, 0.0, 
       0.2, 1.0, 0.2, 200.0, 300.0, 0.0, 
       0.2, 1.0, 1.0, 300.0, 200.0, 0.0, 
       0.2, 0.2, 1.0, 200.0, 100.0, 0.0}; 
    
   glInterleavedArrays (GL_C3F_V3F, 0, intertwined); 
} 
 
void init(void)  
{ 
   glClearColor (0.0, 0.0, 0.0, 0.0); 
   glShadeModel (GL_SMOOTH); 
   setupPointers (); 
} 
 
void display(void) 
{ 
   glClear (GL_COLOR_BUFFER_BIT); 
 
   if (derefMethod == DRAWARRAY)  
      glDrawArrays (GL_TRIANGLES, 0, 6); 
   else if (derefMethod == ARRAYELEMENT) { 
      glBegin (GL_TRIANGLES); 
      glArrayElement (2); 
      glArrayElement (3); 
      glArrayElement (5); 
      glEnd (); 
   } 
   else if (derefMethod == DRAWELEMENTS) { 
      GLuint indices[4] = {0, 1, 3, 4}; 
 
      glDrawElements (GL_POLYGON, 4, GL_UNSIGNED_INT, indices); 
   } 
   glFlush (); 
} 
 
void reshape (int w, int h) 
{ 
   glViewport (0, 0, (GLsizei) w, (GLsizei) h); 
   glMatrixMode (GL_PROJECTION); 
   glLoadIdentity (); 
   gluOrtho2D (0.0, (GLdouble) w, 0.0, (GLdouble) h); 
} 
 
void mouse (int button, int state, int x, int y) 
{ 
   switch (button) { 
      case GLUT_LEFT_BUTTON: 
         if (state == GLUT_DOWN) { 
            if (setupMethod == POINTER) { 
               setupMethod = INTERLEAVED; 
               setupInterleave(); 
            } 
            else if (setupMethod == INTERLEAVED) { 
               setupMethod = POINTER; 
               setupPointers(); 
            } 
            glutPostRedisplay(); 
         } 
         break; 
      case GLUT_MIDDLE_BUTTON: 
      case GLUT_RIGHT_BUTTON: 
         if (state == GLUT_DOWN) { 
            if (derefMethod == DRAWARRAY)  
               derefMethod = ARRAYELEMENT; 
            else if (derefMethod == ARRAYELEMENT)  
               derefMethod = DRAWELEMENTS; 
            else if (derefMethod == DRAWELEMENTS)  
               derefMethod = DRAWARRAY; 
            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); 
   glutInitWindowSize (350, 350);  
   glutInitWindowPosition (100, 100); 
   glutCreateWindow (argv[0]); 
   init (); 
   glutDisplayFunc(display);  
   glutReshapeFunc(reshape); 
   glutMouseFunc(mouse); 
   glutKeyboardFunc (keyboard); 
   glutMainLoop(); 
   return 0; 
} 
#else 
int main(int argc, char** argv) 
{ 
    fprintf (stderr, "This program demonstrates a feature which is not in OpenGL Version 1.0.\n"); 
    fprintf (stderr, "If your implementation of OpenGL Version 1.0 has the right extensions,\n"); 
    fprintf (stderr, "you may be able to modify this program to make it run.\n"); 
    return 0; 
} 
#endif