progs/trivial/tri-unfilled-tri-lit.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
  37 static void Init(void)
  38 {
  39    fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
  40    fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
  41    fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
  42    fflush(stderr);
  43
  44   glEnable(GL_LIGHTING);
  45   glEnable(GL_LIGHT0);
  46
  47     glClearColor(0.0, 0.0, 1.0, 0.0);
  48 }
  49
  50 static void Reshape(int width, int height)
  51 {
  52
  53     glViewport(0, 0, (GLint)width, (GLint)height);
  54
  55     glMatrixMode(GL_PROJECTION);
  56     glLoadIdentity();
  57 /*     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); */
  58     glMatrixMode(GL_MODELVIEW);
  59 }
  60
  61 static void Key(unsigned char key, int x, int y)
  62 {
  63
  64     switch (key) {
  65       case 27:
  66         exit(1);
  67       default:
  68         break;
  69     }
  70
  71     glutPostRedisplay();
  72 }
  73
  74 static void Draw(void)
  75 {
  76    glClear(GL_COLOR_BUFFER_BIT);
  77
  78    glPolygonMode(GL_FRONT, GL_LINE);
  79    glPolygonMode(GL_BACK, GL_LINE);
  80
  81    glBegin(GL_TRIANGLES);
  82    glNormal3f(0,0,.7);
  83    glVertex3f( 0.9, -0.9, -0.0);
  84    glNormal3f(.8,0,0);
  85    glVertex3f( 0.9,  0.9, -0.0);
  86    glNormal3f(0,.9,0);
  87    glVertex3f(-0.9,  0.0, -0.0);
  88    glEnd();
  89
  90    glPolygonMode(GL_FRONT, GL_FILL);
  91    glPolygonMode(GL_BACK, GL_FILL);
  92
  93    glBegin(GL_TRIANGLES);
  94    glNormal3f(0,0,.7);
  95    glVertex3f( 0.8, -0.8, -0.0);
  96    glNormal3f(.8,0,0);
  97    glVertex3f( 0.8,  0.8, -0.0);
  98    glNormal3f(0,.9,0);
  99    glVertex3f(-0.8,  0.0, -0.0);
 100    glEnd();
 101
 102    glPolygonMode(GL_FRONT, GL_LINE);
 103    glPolygonMode(GL_BACK, GL_LINE);
 104
 105    glBegin(GL_TRIANGLES);
 106    glNormal3f(.8,0,0);
 107    glVertex3f( -0.9,  0.9, -0.0);
 108    glNormal3f(0,0,.7);
 109    glVertex3f( -0.9, -0.9, -0.0);
 110    glNormal3f(0,.9,0);
 111    glVertex3f( 0.9,  0.0, -0.0);
 112    glEnd();
 113
 114    glPolygonMode(GL_FRONT, GL_FILL);
 115    glPolygonMode(GL_BACK, GL_FILL);
 116
 117    glBegin(GL_TRIANGLES);
 118    glNormal3f(.8,0,0);
 119    glVertex3f( -0.8,  0.8, -0.0);
 120    glNormal3f(0,0,.7);
 121    glVertex3f( -0.8, -0.8, -0.0);
 122    glNormal3f(0,.9,0);
 123    glVertex3f( 0.8,  0.0, -0.0);
 124    glEnd();
 125
 126    glFlush();
 127
 128    if (doubleBuffer) {
 129       glutSwapBuffers();
 130    }
 131 }
 132
 133 static GLenum Args(int argc, char **argv)
 134 {
 135     GLint i;
 136
 137     doubleBuffer = GL_FALSE;
 138
 139     for (i = 1; i < argc; i++) {
 140         if (strcmp(argv[i], "-sb") == 0) {
 141             doubleBuffer = GL_FALSE;
 142         } else if (strcmp(argv[i], "-db") == 0) {
 143             doubleBuffer = GL_TRUE;
 144         } else {
 145             fprintf(stderr, "%s (Bad option).\n", argv[i]);
 146             return GL_FALSE;
 147         }
 148     }
 149     return GL_TRUE;
 150 }
 151
 152 int main(int argc, char **argv)
 153 {
 154     GLenum type;
 155
 156     glutInit(&argc, argv);
 157
 158     if (Args(argc, argv) == GL_FALSE) {
 159         exit(1);
 160     }
 161
 162     glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
 163
 164     type = GLUT_RGB | GLUT_ALPHA;
 165     type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
 166     glutInitDisplayMode(type);
 167
 168     if (glutCreateWindow(*argv) == GL_FALSE) {
 169         exit(1);
 170     }
 171
 172     Init();
 173
 174     glutReshapeFunc(Reshape);
 175     glutKeyboardFunc(Key);
 176     glutDisplayFunc(Draw);
 177     glutMainLoop();
 178         return 0;
 179 }