Added ESC key handling

progs/redbook/bezmesh.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
@@ -68,7 +68,7 @@ GLfloat ctrlpoints[4][4][3] =
         {1.5, 1.5, -1.0}}
 };
 
-void 
+void
 initlights(void)
 {
     GLfloat ambient[] =
@@ -93,7 +93,7 @@ initlights(void)
     glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);
 }
 
-void 
+void
 display(void)
 {
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
@@ -104,7 +104,7 @@ display(void)
     glFlush();
 }
 
-void 
+void
 myinit(void)
 {
     glClearColor(0.0, 0.0, 0.0, 1.0);
@@ -118,7 +118,7 @@ myinit(void)
     initlights();       /* for lighted version only */
 }
 
-void 
+void
 myReshape(int w, int h)
 {
     glViewport(0, 0, w, h);
@@ -134,7 +134,20 @@ myReshape(int w, int h)
     glLoadIdentity();
 }
 
-int 
+static void
+key(unsigned char k, int x, int y)
+{
+  switch (k) {
+  case 27:  /* Escape */
+    exit(0);
+    break;
+  default:
+    return;
+  }
+  glutPostRedisplay();
+}
+
+int
 main(int argc, char **argv)
 {
     glutInit(&argc, argv);
@@ -143,6 +156,7 @@ main(int argc, char **argv)
     myinit();
     glutReshapeFunc(myReshape);
     glutDisplayFunc(display);
+    glutKeyboardFunc(key);
     glutMainLoop();
     return 0;             /* ANSI C requires main to return int. */
 }