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