progs/trivial/dlist-flat-tri.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    fflush(stderr);
  44
  45    glClearColor(0.0, 0.0, 1.0, 0.0);
  46
  47    list = glGenLists(1);
  48    glNewList(list, GL_COMPILE);
  49
  50    /* XXX: this state-change will only be executed if list is called
  51     * from outside a begin/end pair:
  52     */
  53    glShadeModel( GL_FLAT );
  54    glBegin(GL_TRIANGLES);
  55    glColor3f(0,0,.7);
  56    glVertex3f( -0.9,  0.9, -30.0);
  57    glColor3f(0,.9,0);
  58    glVertex3f( -0.9, -0.9, -30.0);
  59    glColor3f(.8,0,0);
  60    glVertex3f(  0.9,  0.0, -30.0);
  61    glEnd();
  62
  63    /* This statechange is potentially NOT redundant:
  64     */
  65    glShadeModel( GL_FLAT );
  66    glBegin(GL_TRIANGLES);
  67    glColor3f(0,1,0);
  68    glVertex3f( -0.5,  0.5, -30.0);
  69    glColor3f(0,0,1);
  70    glVertex3f( -0.5, -0.5, -30.0);
  71    glColor3f(1,0,0);
  72    glVertex3f(  0.5,  0.0, -30.0);
  73    glEnd();
  74
  75    glEndList();
  76 }
  77
  78 static void Reshape(int width, int height)
  79 {
  80
  81     glViewport(0, 0, (GLint)width, (GLint)height);
  82
  83     glMatrixMode(GL_PROJECTION);
  84     glLoadIdentity();
  85     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
  86     glMatrixMode(GL_MODELVIEW);
  87 }
  88
  89 static void Key(unsigned char key, int x, int y)
  90 {
  91
  92     switch (key) {
  93       case 27:
  94         exit(1);
  95       default:
  96         break;
  97     }
  98
  99     glutPostRedisplay();
 100 }
 101
 102
 103
 104
 105 static void Draw(void)
 106 {
 107    glClear(GL_COLOR_BUFFER_BIT);
 108
 109    glShadeModel( GL_SMOOTH );
 110
 111    glBegin(GL_TRIANGLES);
 112
 113    /* Note: call the list from inside a begin/end pair.  The end is
 114     * provided by the display list...
 115     */
 116    glCallList(list);
 117
 118    glFlush();
 119
 120    if (doubleBuffer) {
 121       glutSwapBuffers();
 122    }
 123 }
 124
 125 static GLenum Args(int argc, char **argv)
 126 {
 127     GLint i;
 128
 129     doubleBuffer = GL_FALSE;
 130
 131     for (i = 1; i < argc; i++) {
 132         if (strcmp(argv[i], "-sb") == 0) {
 133             doubleBuffer = GL_FALSE;
 134         } else if (strcmp(argv[i], "-db") == 0) {
 135             doubleBuffer = GL_TRUE;
 136         } else {
 137             fprintf(stderr, "%s (Bad option).\n", argv[i]);
 138             return GL_FALSE;
 139         }
 140     }
 141     return GL_TRUE;
 142 }
 143
 144 int main(int argc, char **argv)
 145 {
 146     GLenum type;
 147
 148     glutInit(&argc, argv);
 149
 150     if (Args(argc, argv) == GL_FALSE) {
 151         exit(1);
 152     }
 153
 154     glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
 155
 156     type = GLUT_RGB | GLUT_ALPHA;
 157     type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
 158     glutInitDisplayMode(type);
 159
 160     if (glutCreateWindow(*argv) == GL_FALSE) {
 161         exit(1);
 162     }
 163
 164     Init();
 165
 166     glutReshapeFunc(Reshape);
 167     glutKeyboardFunc(Key);
 168     glutDisplayFunc(Draw);
 169     glutMainLoop();
 170         return 0;
 171 }