progs/trivial/dlist-edgeflag.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 <GL/glut.h>
  29
  30
  31 #define CI_OFFSET_1 16
  32 #define CI_OFFSET_2 32
  33
  34
  35 GLenum doubleBuffer;
  36 GLint list;
  37
  38 static void Init(void)
  39 {
  40    fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
  41    fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
  42    fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
  43
  44    glClearColor(0.0, 0.0, 1.0, 0.0);
  45
  46    glPolygonMode(GL_FRONT, GL_LINE);
  47    glPolygonMode(GL_BACK, GL_POINT);
  48
  49    list = glGenLists(1);
  50    glNewList(list, GL_COMPILE);
  51    glBegin(GL_TRIANGLES);
  52    glEdgeFlag(1);
  53 /*    glColor3f(0,0,.7);  */
  54    glVertex3f( 0.9, -0.9, -30.0);
  55    glEdgeFlag(0);
  56 /*    glColor3f(.8,0,0);  */
  57    glVertex3f( 0.9,  0.9, -30.0);
  58    glEdgeFlag(1);
  59 /*    glColor3f(0,.9,0);  */
  60    glVertex3f(-0.9,  0.0, -30.0);
  61    glEnd();
  62    glEndList();
  63 }
  64
  65 static void Reshape(int width, int height)
  66 {
  67
  68     glViewport(0, 0, (GLint)width, (GLint)height);
  69
  70     glMatrixMode(GL_PROJECTION);
  71     glLoadIdentity();
  72     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
  73     glMatrixMode(GL_MODELVIEW);
  74 }
  75
  76 static void Key(unsigned char key, int x, int y)
  77 {
  78
  79     switch (key) {
  80       case 27:
  81         exit(1);
  82       default:
  83         return;
  84     }
  85
  86     glutPostRedisplay();
  87 }
  88
  89
  90
  91
  92 static void Draw(void)
  93 {
  94    glClear(GL_COLOR_BUFFER_BIT);
  95
  96    glPushMatrix();
  97    glColor3f(0,.9,0);
  98    glCallList(list);
  99
 100    glRotatef(45,0,0,1);
 101    glColor3f(1,0,1);
 102    glCallList(list);
 103    glPopMatrix();
 104
 105    glFlush();
 106
 107    if (doubleBuffer) {
 108       glutSwapBuffers();
 109    }
 110 }
 111
 112 static GLenum Args(int argc, char **argv)
 113 {
 114     GLint i;
 115
 116     doubleBuffer = GL_FALSE;
 117
 118     for (i = 1; i < argc; i++) {
 119         if (strcmp(argv[i], "-sb") == 0) {
 120             doubleBuffer = GL_FALSE;
 121         } else if (strcmp(argv[i], "-db") == 0) {
 122             doubleBuffer = GL_TRUE;
 123         } else {
 124             fprintf(stderr, "%s (Bad option).\n", argv[i]);
 125             return GL_FALSE;
 126         }
 127     }
 128     return GL_TRUE;
 129 }
 130
 131 int main(int argc, char **argv)
 132 {
 133     GLenum type;
 134
 135     glutInit(&argc, argv);
 136
 137     if (Args(argc, argv) == GL_FALSE) {
 138         exit(1);
 139     }
 140
 141     glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
 142
 143     type = GLUT_RGB | GLUT_ALPHA;
 144     type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
 145     glutInitDisplayMode(type);
 146
 147     if (glutCreateWindow("First Tri") == GL_FALSE) {
 148         exit(1);
 149     }
 150
 151     Init();
 152
 153     glutReshapeFunc(Reshape);
 154     glutKeyboardFunc(Key);
 155     glutDisplayFunc(Draw);
 156     glutMainLoop();
 157         return 0;
 158 }