progs/trivial/dlist-recursive-call.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    glShadeModel( GL_SMOOTH );
  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    glBegin(GL_TRIANGLES);
  62    glColor3f(0,0,.7);
  63    glVertex3f( 0.9, -0.9, -30.0);
  64    glColor3f(.8,0,0);
  65    glVertex3f( 0.9,  0.9, -30.0);
  66    glColor3f(0,.9,0);
  67    glVertex3f(-0.9,  0.0, -30.0);
  68    glEnd();
  69
  70    glShadeModel( GL_FLAT );
  71    glBegin(GL_TRIANGLES);
  72    glColor3f(0,0,.7);
  73    glVertex3f( -0.9,  0.9, -30.0);
  74    glColor3f(0,.9,0);
  75    glVertex3f( -0.9, -0.9, -30.0);
  76    glColor3f(.8,0,0);
  77    glVertex3f(  0.9,  0.0, -30.0);
  78    glEnd();
  79
  80    glCallList( first_list );
  81
  82    /* Do a quick begin/end to ensure we are not inside a dangling
  83     * primitive from the called list:
  84     */
  85    glBegin( GL_POINTS );
  86    glEnd();
  87
  88    /* This statechange is NOT redundant:
  89     */
  90    glShadeModel( GL_FLAT );
  91    glBegin(GL_TRIANGLES);
  92    glColor3f(1,0,0);
  93    glVertex3f( -0.5,  0.5, -30.0);
  94    glColor3f(0,1,0);
  95    glVertex3f( -0.5, -0.5, -30.0);
  96    glColor3f(0,0,1);
  97    glVertex3f(  0.5,  0.0, -30.0);
  98    glEnd();
  99
 100    glEndList();
 101 }
 102
 103 static void Reshape(int width, int height)
 104 {
 105
 106     glViewport(0, 0, (GLint)width, (GLint)height);
 107
 108     glMatrixMode(GL_PROJECTION);
 109     glLoadIdentity();
 110     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
 111     glMatrixMode(GL_MODELVIEW);
 112 }
 113
 114 static void Key(unsigned char key, int x, int y)
 115 {
 116
 117     switch (key) {
 118       case 27:
 119         exit(1);
 120       default:
 121         break;
 122     }
 123
 124     glutPostRedisplay();
 125 }
 126
 127
 128
 129
 130 static void Draw(void)
 131 {
 132    glClear(GL_COLOR_BUFFER_BIT);
 133
 134    glShadeModel( GL_SMOOTH );
 135    glCallList(list);
 136
 137    glFlush();
 138
 139    if (doubleBuffer) {
 140       glutSwapBuffers();
 141    }
 142 }
 143
 144 static GLenum Args(int argc, char **argv)
 145 {
 146     GLint i;
 147
 148     doubleBuffer = GL_FALSE;
 149
 150     for (i = 1; i < argc; i++) {
 151         if (strcmp(argv[i], "-sb") == 0) {
 152             doubleBuffer = GL_FALSE;
 153         } else if (strcmp(argv[i], "-db") == 0) {
 154             doubleBuffer = GL_TRUE;
 155         } else {
 156             fprintf(stderr, "%s (Bad option).\n", argv[i]);
 157             return GL_FALSE;
 158         }
 159     }
 160     return GL_TRUE;
 161 }
 162
 163 int main(int argc, char **argv)
 164 {
 165     GLenum type;
 166
 167     glutInit(&argc, argv);
 168
 169     if (Args(argc, argv) == GL_FALSE) {
 170         exit(1);
 171     }
 172
 173     glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
 174
 175     type = GLUT_RGB | GLUT_ALPHA;
 176     type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
 177     glutInitDisplayMode(type);
 178
 179     if (glutCreateWindow(*argv) == GL_FALSE) {
 180         exit(1);
 181     }
 182
 183     Init();
 184
 185     glutReshapeFunc(Reshape);
 186     glutKeyboardFunc(Key);
 187     glutDisplayFunc(Draw);
 188     glutMainLoop();
 189         return 0;
 190 }