Added ESC key handling

progs/redbook/double.c

@@ -1,13 +1,13 @@
 /*
  * Copyright (c) 1993-1997, Silicon Graphics, Inc.
- * ALL RIGHTS RESERVED 
- * Permission to use, copy, modify, and distribute this software for 
+ * ALL RIGHTS RESERVED
+ * Permission to use, copy, modify, and distribute this software for
  * any purpose and without fee is hereby granted, provided that the above
  * copyright notice appear in all copies and that both the copyright notice
- * and this permission notice appear in supporting documentation, and that 
+ * and this permission notice appear in supporting documentation, and that
  * the name of Silicon Graphics, Inc. not be used in advertising
  * or publicity pertaining to distribution of the software without specific,
- * written prior permission. 
+ * written prior permission.
  *
  * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
  * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
@@ -21,8 +21,8 @@
  * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
  * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
  * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
- * 
- * US Government Users Restricted Rights 
+ *
+ * US Government Users Restricted Rights
  * Use, duplication, or disclosure by the Government is subject to
  * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
  * (c)(1)(ii) of the Rights in Technical Data and Computer Software
@@ -66,7 +66,7 @@ void spinDisplay(void)
    glutPostRedisplay();
 }
 
-void init(void) 
+void init(void)
 {
    glClearColor (0.0, 0.0, 0.0, 0.0);
    glShadeModel (GL_FLAT);
@@ -83,7 +83,7 @@ void reshape(int w, int h)
 }
 
 /* ARGSUSED2 */
-void mouse(int button, int state, int x, int y) 
+void mouse(int button, int state, int x, int y)
 {
    switch (button) {
       case GLUT_LEFT_BUTTON:
@@ -98,8 +98,21 @@ void mouse(int button, int state, int x, int y)
          break;
    }
 }
-   
-/* 
+
+static void
+key(unsigned char k, int x, int y)
+{
+  switch (k) {
+  case 27:  /* Escape */
+    exit(0);
+    break;
+  default:
+    return;
+  }
+  glutPostRedisplay();
+}
+
+/*
  *  Request double buffer display mode.
  *  Register mouse input callback functions
  */
@@ -107,13 +120,14 @@ int main(int argc, char** argv)
 {
    glutInit(&argc, argv);
    glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB);
-   glutInitWindowSize (250, 250); 
+   glutInitWindowSize (250, 250);
    glutInitWindowPosition (100, 100);
    glutCreateWindow (argv[0]);
    init ();
-   glutDisplayFunc(display); 
-   glutReshapeFunc(reshape); 
+   glutDisplayFunc(display);
+   glutReshapeFunc(reshape);
    glutMouseFunc(mouse);
+   glutKeyboardFunc(key);
    glutMainLoop();
    return 0;   /* ANSI C requires main to return int. */
 }