Added ESC key handling

1 files changed, 29 insertions, 15 deletions

diff --git a/progs/redbook/fogindex.c b/progs/redbook/fogindex.c
index b409c95..b8bb691 100644
--- a/progs/redbook/fogindex.c
+++ b/progs/redbook/fogindex.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
@@ -39,21 +39,21 @@
  */
 /*
  *  fogindex.c
- *  This program demonstrates fog in color index mode.  
- *  Three cones are drawn at different z values in a linear 
- *  fog.  32 contiguous colors (from 16 to 47) are loaded 
+ *  This program demonstrates fog in color index mode.
+ *  Three cones are drawn at different z values in a linear
+ *  fog.  32 contiguous colors (from 16 to 47) are loaded
  *  with a color ramp.
  */
 #include <stdlib.h>
 #include <GL/glut.h>
 
-/*  Initialize color map and fog.  Set screen clear color 
+/*  Initialize color map and fog.  Set screen clear color
  *  to end of color ramp.
  */
 #define NUM_COLORS 32
 #define RAMPSTART 16
 
-void 
+void
 myinit(void)
 {
   int i;
@@ -77,7 +77,7 @@ myinit(void)
 
 /*  display() renders 3 cones at different z positions.
  */
-void 
+void
 display(void)
 {
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
@@ -104,7 +104,7 @@ display(void)
   glFlush();
 }
 
-void 
+void
 myReshape(int w, int h)
 {
   glViewport(0, 0, w, h);
@@ -120,11 +120,24 @@ myReshape(int w, int h)
   glLoadIdentity();
 }
 
+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, depth buffer, and handle input events.
  */
-int 
+int
 main(int argc, char **argv)
 {
   glutInit(&argc, argv);
@@ -133,6 +146,7 @@ main(int argc, char **argv)
   myinit();
   glutReshapeFunc(myReshape);
   glutDisplayFunc(display);
+  glutKeyboardFunc(key);
   glutMainLoop();
   return 0;             /* ANSI C requires main to return int. */
 }