src/trivial/tri-edgeflag-array.c

   1 /*
   2  * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and
   5  * its documentation for any purpose is hereby granted without fee, provided
   6  * that (i) the above copyright notices and this permission notice appear in
   7  * all copies of the software and related documentation, and (ii) the name of
   8  * Silicon Graphics may not be used in any advertising or
   9  * publicity relating to the software without the specific, prior written
  10  * permission of Silicon Graphics.
  11  *
  12  * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
  13  * ANY KIND,
  14  * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
  15  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
  16  *
  17  * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
  18  * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
  19  * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  20  * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
  21  * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  22  * OF THIS SOFTWARE.
  23  */
  24
  25 #include <stdio.h>
  26 #include <string.h>
  27 #include <stdlib.h>
  28 #include "glut_wrap.h"
  29
  30 static GLenum frontface = GL_CCW;
  31
  32
  33 static void
  34 Init(void)
  35 {
  36    fprintf(stderr, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
  37    fprintf(stderr, "GL_VERSION  = %s\n", (char *) glGetString(GL_VERSION));
  38    fprintf(stderr, "GL_VENDOR   = %s\n", (char *) glGetString(GL_VENDOR));
  39    fflush(stderr);
  40 }
  41
  42
  43 static void
  44 Reshape(int width, int height)
  45 {
  46    glViewport(0, 0, (GLint)width, (GLint)height);
  47    glMatrixMode(GL_PROJECTION);
  48    glLoadIdentity();
  49    glMatrixMode(GL_MODELVIEW);
  50 }
  51
  52
  53 static void
  54 Key(unsigned char key, int x, int y)
  55 {
  56    switch (key) {
  57    case 'f':
  58       frontface = (frontface == GL_CCW) ? GL_CW : GL_CCW;
  59       glFrontFace(frontface);
  60       break;
  61    case 27:
  62       exit(1);
  63    default:
  64       return;
  65    }
  66    glutPostRedisplay();
  67 }
  68
  69
  70 static void
  71 Draw(void)
  72 {
  73    static GLboolean flags[3] = { 1, 0, 1};
  74    static GLfloat color[3][3] = {
  75       { 0.3, 0.3, 0.9 },
  76       { 0.8, 0.0, 0.0 },
  77       { 0.0, 0.9, 0.0 }
  78    };
  79    static GLfloat vert[3][3] = {
  80       { 0.9, -0.9, 0.0 },
  81       { 0.9, 0.9, 0.0 },
  82       { -0.9, 0.0, 0.0 }
  83    };
  84
  85    glClear(GL_COLOR_BUFFER_BIT);
  86    glPolygonMode(GL_FRONT, GL_LINE);
  87    glPolygonMode(GL_BACK, GL_POINT);
  88
  89    glVertexPointer(3, GL_FLOAT, 0, vert);
  90    glColorPointer(3, GL_FLOAT, 0, color);
  91    glEdgeFlagPointer(0, flags);
  92    glEnableClientState(GL_VERTEX_ARRAY);
  93    glEnableClientState(GL_COLOR_ARRAY);
  94    glEnableClientState(GL_EDGE_FLAG_ARRAY);
  95
  96    glDrawArrays(GL_TRIANGLES, 0, 3);
  97
  98    glutSwapBuffers();
  99 }
 100
 101
 102 int
 103 main(int argc, char **argv)
 104 {
 105    glutInit(&argc, argv);
 106
 107    glutInitWindowPosition(0, 0);
 108    glutInitWindowSize( 250, 250);
 109    glutInitDisplayMode(GLUT_RGB | GLUT_ALPHA | GLUT_DOUBLE);
 110    if (!glutCreateWindow(*argv)) {
 111       exit(1);
 112    }
 113    glutReshapeFunc(Reshape);
 114    glutKeyboardFunc(Key);
 115    glutDisplayFunc(Draw);
 116    Init();
 117    glutMainLoop();
 118    return 0;
 119 }