Added ESC key handling

1 files changed, 27 insertions, 13 deletions

diff --git a/progs/redbook/hello.c b/progs/redbook/hello.c
index 516c9ecc002..4f644a46a80 100644
--- a/progs/redbook/hello.c
+++ b/progs/redbook/hello.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
@@ -47,7 +47,7 @@ void display(void)
    glClear (GL_COLOR_BUFFER_BIT);
 
 /* draw white polygon (rectangle) with corners at
- * (0.25, 0.25, 0.0) and (0.75, 0.75, 0.0)  
+ * (0.25, 0.25, 0.0) and (0.75, 0.75, 0.0)
  */
    glColor3f (1.0, 1.0, 1.0);
    glBegin(GL_POLYGON);
@@ -57,13 +57,13 @@ void display(void)
       glVertex3f (0.25, 0.75, 0.0);
    glEnd();
 
-/* don't wait!  
- * start processing buffered OpenGL routines 
+/* don't wait!
+ * start processing buffered OpenGL routines
  */
    glFlush ();
 }
 
-void init (void) 
+void init (void)
 {
 /* select clearing color 	*/
    glClearColor (0.0, 0.0, 0.0, 0.0);
@@ -74,7 +74,20 @@ void init (void)
    glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);
 }
 
-/* 
+static void
+key(unsigned char k, int x, int y)
+{
+  switch (k) {
+  case 27:  /* Escape */
+    exit(0);
+    break;
+  default:
+    return;
+  }
+  glutPostRedisplay();
+}
+
+/*
  * Declare initial window size, position, and display mode
  * (single buffer and RGBA).  Open window with "hello"
  * in its title bar.  Call initialization routines.
@@ -85,11 +98,12 @@ int main(int argc, char** argv)
 {
    glutInit(&argc, argv);
    glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
-   glutInitWindowSize (250, 250); 
+   glutInitWindowSize (250, 250);
    glutInitWindowPosition (100, 100);
    glutCreateWindow ("hello");
    init ();
-   glutDisplayFunc(display); 
+   glutDisplayFunc(display);
+   glutKeyboardFunc(key);
    glutMainLoop();
    return 0;   /* ANSI C requires main to return int. */
 }