progs/trivial/dlist-begin-call-end.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 first_list, 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    /* First list will disrupt state which might potentially be
  48     * short-circuited in calling list:
  49     */
  50    first_list = glGenLists(1);
  51    glNewList(first_list, GL_COMPILE);
  52    /* glColor3f(0,1,0); */
  53    glEndList();
  54
  55
  56    /* List that looks like it might have redundant state:
  57     */
  58    list = glGenLists(1);
  59    glNewList(list, GL_COMPILE);
  60
  61    glShadeModel(GL_FLAT);
  62    glBegin(GL_TRIANGLES);
  63    glColor3f(1,0,0);
  64    glVertex3f( -0.9,  0.9, -30.0);
  65    glVertex3f( -0.9, -0.9, -30.0);
  66    glCallList( first_list );
  67    glVertex3f(  0.9,  0.0, -30.0);
  68    glEnd();
  69    glEndList();
  70 }
  71
  72 static void Reshape(int width, int height)
  73 {
  74
  75     glViewport(0, 0, (GLint)width, (GLint)height);
  76
  77     glMatrixMode(GL_PROJECTION);
  78     glLoadIdentity();
  79     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
  80     glMatrixMode(GL_MODELVIEW);
  81 }
  82
  83 static void Key(unsigned char key, int x, int y)
  84 {
  85
  86     switch (key) {
  87       case 27:
  88         exit(1);
  89       default:
  90         break;
  91     }
  92
  93     glutPostRedisplay();
  94 }
  95
  96
  97
  98
  99 static void Draw(void)
 100 {
 101    glClear(GL_COLOR_BUFFER_BIT);
 102
 103    glShadeModel( GL_SMOOTH );
 104    glCallList(list);
 105
 106    glFlush();
 107
 108    if (doubleBuffer) {
 109       glutSwapBuffers();
 110    }
 111 }
 112
 113 static GLenum Args(int argc, char **argv)
 114 {
 115     GLint i;
 116
 117     doubleBuffer = GL_FALSE;
 118
 119     for (i = 1; i < argc; i++) {
 120         if (strcmp(argv[i], "-sb") == 0) {
 121             doubleBuffer = GL_FALSE;
 122         } else if (strcmp(argv[i], "-db") == 0) {
 123             doubleBuffer = GL_TRUE;
 124         } else {
 125             fprintf(stderr, "%s (Bad option).\n", argv[i]);
 126             return GL_FALSE;
 127         }
 128     }
 129     return GL_TRUE;
 130 }
 131
 132 int main(int argc, char **argv)
 133 {
 134     GLenum type;
 135
 136     glutInit(&argc, argv);
 137
 138     if (Args(argc, argv) == GL_FALSE) {
 139         exit(1);
 140     }
 141
 142     glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
 143
 144     type = GLUT_RGB | GLUT_ALPHA;
 145     type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
 146     glutInitDisplayMode(type);
 147
 148     if (glutCreateWindow(*argv) == GL_FALSE) {
 149         exit(1);
 150     }
 151
 152     Init();
 153
 154     glutReshapeFunc(Reshape);
 155     glutKeyboardFunc(Key);
 156     glutDisplayFunc(Draw);
 157     glutMainLoop();
 158         return 0;
 159 }