/*
 * (c) Copyright 1993, 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 * Unpublished-- rights reserved under the copyright laws of the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(TM) is a trademark of Silicon Graphics, Inc.
 */
/*  checker.c
 *  This program texture maps a checkerboard image onto
 *  two rectangles.  This program clamps the texture, if
 *  the texture coordinates fall outside 0.0 and 1.0.
 */

#include <windows.h>

#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glaux.h>

#define LI 64 
#define LH 64 
GLubyte image[LI][LH][3]; 
  
void makeImage(void) { 
  int i,j,c; 
  for( i = 0 ; i < LI ; i++ ) { 
    for( j = 0 ; j < LH ; j++ ) { 
      c =(((i&0x8)==0)^((j&0x8)==0))*255; 
      image[i][j][0] =(GLubyte) c; 
      image[i][j][1] =(GLubyte) c; 
      image[i][j][2] =(GLubyte) c; } } 
} 
  
void myinit(void) { 
  glClearColor(0.0,0.0,0.0,0.0); 
  glEnable(GL_DEPTH_TEST); 
  glDepthFunc(GL_LESS); 
  makeImage(); 
  glPixelStorei(GL_UNPACK_ALIGNMENT,1); 
  glTexImage2D(GL_TEXTURE_2D,0,3,LI,LH,0,GL_RGB,GL_UNSIGNED_BYTE,&image[0][0][0]); 
  glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP); 
  glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP); 
  glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST); 
  glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST); 
  glTexEnvf(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_DECAL); 
  glEnable(GL_TEXTURE_2D); 
  glShadeModel(GL_FLAT); 
} 
  
void CALLBACK display(void) { 
  glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); 
  glBegin(GL_QUADS); 
  glTexCoord2f(0.0F,0.0F); 
  glVertex3f(-2.0F,-1.0F,0.0F); 
  glTexCoord2f(0.0F,1.0F); 
  glVertex3f(-2.0F,1.0F,0.0F); 
  glTexCoord2f(1.0F,1.0F); 
  glVertex3f(0.0F,1.0F,0.0F); 
  glTexCoord2f(1.0F,0.0F); 
  glVertex3f(0.0F,-1.0F,0.0F); 
  glTexCoord2f(0.0F,0.0F); 
  glVertex3f(1.0F,-1.0F,0.0F); 
  glTexCoord2f(0.0F,1.0F); 
  glVertex3f(1.0F,1.0F,0.0F); 
  glTexCoord2f(1.0F,1.0F); 
  glVertex3f(2.41421F,1.0F,-1.41421F); 
  glTexCoord2f(1.0F,0.0F); 
  glVertex3f(2.41421F,-1.0F,-1.41421F); 
  glEnd(); 
  glFlush(); 
} 
  
void CALLBACK myReshape(int w,int h) { 
  glViewport(0,0,w,h); 
  glMatrixMode(GL_PROJECTION); 
  glLoadIdentity(); 
  gluPerspective(43.0,1.0*(float)w/(float)h,1.0,30.0); 
  glMatrixMode(GL_MODELVIEW); 
  glLoadIdentity(); 
  glTranslatef(0.0F,0.0F,-3.6F); 
} 
  
void main(void) { 
  auxInitDisplayMode(AUX_SINGLE|AUX_RGB|AUX_DEPTH); 
  auxInitPosition(0,0,300,200); 
  auxInitWindow("Les échiquiers"); 
  myinit(); 
  auxReshapeFunc(myReshape); 
  auxMainLoop(display); 
}