Added ESC key handling

1 files changed, 26 insertions, 12 deletions

diff --git a/progs/redbook/stencil.c b/progs/redbook/stencil.c
index 958cf85c8ea..5626d55be6b 100644
--- a/progs/redbook/stencil.c
+++ b/progs/redbook/stencil.c
@@ -3,14 +3,14 @@
 
 /*
  * (c) Copyright 1993, 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,
@@ -24,8 +24,8 @@
  * 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
@@ -38,9 +38,9 @@
  * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
  */
 /*  stencil.c
- *  This program draws two rotated tori in a window.  
- *  A diamond in the center of the window masks out part 
- *  of the scene.  Within this mask, a different model 
+ *  This program draws two rotated tori in a window.
+ *  A diamond in the center of the window masks out part
+ *  of the scene.  Within this mask, a different model
  *  (a sphere) is drawn in a different color.
  */
 #include <stdlib.h>
@@ -49,7 +49,7 @@
 #define YELLOWMAT   1
 #define BLUEMAT 2
 
-void myinit (void) 
+void myinit (void)
 {
     GLfloat yellow_diffuse[] = { 0.7, 0.7, 0.0, 1.0 };
     GLfloat yellow_specular[] = { 1.0, 1.0, 1.0, 1.0 };
@@ -112,7 +112,7 @@ void display(void)
     glFlush();
 }
 
-/*  Whenever the window is reshaped, redefine the 
+/*  Whenever the window is reshaped, redefine the
  *  coordinate system and redraw the stencil area.
  */
 void myReshape(int w, int h)
@@ -144,8 +144,21 @@ void myReshape(int w, int h)
     glTranslatef(0.0, 0.0, -5.0);
 }
 
+static void
+key(unsigned char k, int x, int y)
+{
+  switch (k) {
+  case 27:  /* Escape */
+    exit(0);
+    break;
+  default:
+    return;
+  }
+  glutPostRedisplay();
+}
+
 /*  Main Loop
- *  Open window with initial window size, title bar, 
+ *  Open window with initial window size, title bar,
  *  RGBA display mode, and handle input events.
  */
 int main(int argc, char** argv)
@@ -157,6 +170,7 @@ int main(int argc, char** argv)
     myinit ();
     glutReshapeFunc (myReshape);
     glutDisplayFunc(display);
+    glutKeyboardFunc(key);
     glutMainLoop();
     return 0;             /* ANSI C requires main to return int. */
 }