/*
 * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software and
 * its documentation for any purpose is hereby granted without fee, provided
 * that (i) the above copyright notices and this permission notice appear in
 * all copies of the software and related documentation, and (ii) the name of
 * Silicon Graphics may not be used in any advertising or
 * publicity relating to the software without the specific, prior written
 * permission of Silicon Graphics.
 *
 * THE SOFTWARE IS PROVIDED "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 BE LIABLE FOR
 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "glut_wrap.h"

static GLenum frontface = GL_CCW;


static void
Init(void)
{
   fprintf(stderr, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
   fprintf(stderr, "GL_VERSION  = %s\n", (char *) glGetString(GL_VERSION));
   fprintf(stderr, "GL_VENDOR   = %s\n", (char *) glGetString(GL_VENDOR));
   fflush(stderr);
}


static void
Reshape(int width, int height)
{
   glViewport(0, 0, (GLint)width, (GLint)height);
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   glMatrixMode(GL_MODELVIEW);
}


static void
Key(unsigned char key, int x, int y)
{
   switch (key) {
   case 'f':
      frontface = (frontface == GL_CCW) ? GL_CW : GL_CCW;
      glFrontFace(frontface);
      break;
   case 27:
      exit(1);
   default:
      return;
   }
   glutPostRedisplay();
}


static void
Draw(void)
{
   static GLboolean flags[3] = { 1, 0, 1};
   static GLfloat color[3][3] = {
      { 0.3, 0.3, 0.9 },
      { 0.8, 0.0, 0.0 },
      { 0.0, 0.9, 0.0 }
   };
   static GLfloat vert[3][3] = {
      { 0.9, -0.9, 0.0 },
      { 0.9, 0.9, 0.0 },
      { -0.9, 0.0, 0.0 }
   };

   glClear(GL_COLOR_BUFFER_BIT); 
   glPolygonMode(GL_FRONT, GL_LINE);
   glPolygonMode(GL_BACK, GL_POINT);

   glVertexPointer(3, GL_FLOAT, 0, vert);
   glColorPointer(3, GL_FLOAT, 0, color);
   glEdgeFlagPointer(0, flags);
   glEnableClientState(GL_VERTEX_ARRAY);
   glEnableClientState(GL_COLOR_ARRAY);
   glEnableClientState(GL_EDGE_FLAG_ARRAY);

   glDrawArrays(GL_TRIANGLES, 0, 3);

   glutSwapBuffers();
}


int
main(int argc, char **argv)
{
   glutInit(&argc, argv);

   glutInitWindowPosition(0, 0);
   glutInitWindowSize( 250, 250);
   glutInitDisplayMode(GLUT_RGB | GLUT_ALPHA | GLUT_DOUBLE);
   if (!glutCreateWindow(*argv)) {
      exit(1);
   }
   glutReshapeFunc(Reshape);
   glutKeyboardFunc(Key);
   glutDisplayFunc(Draw);
   Init();
   glutMainLoop();
   return 0;
}