Demos (master): egl/eglut: Avoid busy looping.

[Chia-I Wu]

Module: Demos
Branch: master
Commit: 1222800fd2037d5e1b3c781bb70443dbb9743095
URL:    http://cgit.freedesktop.org/mesa/demos/commit/?id=1222800fd2037d5e1b3c781bb70443dbb9743095

Author: Chia-I Wu <olvaffe at gmail.com>
Date:   Thu Dec  2 16:38:09 2010 +0800

egl/eglut: Avoid busy looping.

next_event should block unless there is an idle callback.

---

 src/egl/eglut/eglut_x11.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/egl/eglut/eglut_x11.c b/src/egl/eglut/eglut_x11.c
index 78a7b86..af3eb2c 100644
--- a/src/egl/eglut/eglut_x11.c
+++ b/src/egl/eglut/eglut_x11.c
@@ -183,11 +183,18 @@ next_event(struct eglut_window *win)
    XEvent event;
 
    if (!XPending(_eglut->native_dpy)) {
-      if (_eglut->idle_cb)
+      /* there is an idle callback */
+      if (_eglut->idle_cb) {
          _eglut->idle_cb();
-      return;
+         return;
+      }
+
+      /* the app requests re-display */
+      if (_eglut->redisplay)
+         return;
    }
 
+   /* block for next event */
    XNextEvent(_eglut->native_dpy, &event);
 
    switch (event.type) {