intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 172 insertions, 0 deletions

diff --git a/contrib/python/ipython/py3/IPython/lib/inputhookglut.py b/contrib/python/ipython/py3/IPython/lib/inputhookglut.py
new file mode 100644
index 0000000000..e6f7f12575
--- /dev/null
+++ b/contrib/python/ipython/py3/IPython/lib/inputhookglut.py
@@ -0,0 +1,172 @@
+# coding: utf-8
+"""
+GLUT Inputhook support functions
+"""
+
+#-----------------------------------------------------------------------------
+#  Copyright (C) 2008-2011  The IPython Development Team
+#
+#  Distributed under the terms of the BSD License.  The full license is in
+#  the file COPYING, distributed as part of this software.
+#-----------------------------------------------------------------------------
+
+# GLUT is quite an old library and it is difficult to ensure proper
+# integration within IPython since original GLUT does not allow to handle
+# events one by one. Instead, it requires for the mainloop to be entered
+# and never returned (there is not even a function to exit he
+# mainloop). Fortunately, there are alternatives such as freeglut
+# (available for linux and windows) and the OSX implementation gives
+# access to a glutCheckLoop() function that blocks itself until a new
+# event is received. This means we have to setup the idle callback to
+# ensure we got at least one event that will unblock the function.
+#
+# Furthermore, it is not possible to install these handlers without a window
+# being first created. We choose to make this window invisible. This means that
+# display mode options are set at this level and user won't be able to change
+# them later without modifying the code. This should probably be made available
+# via IPython options system.
+
+#-----------------------------------------------------------------------------
+# Imports
+#-----------------------------------------------------------------------------
+import os
+import sys
+import time
+import signal
+import OpenGL.GLUT as glut
+import OpenGL.platform as platform
+from timeit import default_timer as clock
+
+#-----------------------------------------------------------------------------
+# Constants
+#-----------------------------------------------------------------------------
+
+# Frame per second : 60
+# Should probably be an IPython option
+glut_fps = 60
+
+
+# Display mode : double buffeed + rgba + depth
+# Should probably be an IPython option
+glut_display_mode = (glut.GLUT_DOUBLE |
+                     glut.GLUT_RGBA   |
+                     glut.GLUT_DEPTH)
+
+glutMainLoopEvent = None
+if sys.platform == 'darwin':
+    try:
+        glutCheckLoop = platform.createBaseFunction(
+            'glutCheckLoop', dll=platform.GLUT, resultType=None,
+            argTypes=[],
+            doc='glutCheckLoop(  ) -> None',
+            argNames=(),
+            )
+    except AttributeError:
+        raise RuntimeError(
+            '''Your glut implementation does not allow interactive sessions'''
+            '''Consider installing freeglut.''')
+    glutMainLoopEvent = glutCheckLoop
+elif glut.HAVE_FREEGLUT:
+    glutMainLoopEvent = glut.glutMainLoopEvent
+else:
+    raise RuntimeError(
+        '''Your glut implementation does not allow interactive sessions. '''
+        '''Consider installing freeglut.''')
+
+
+#-----------------------------------------------------------------------------
+# Platform-dependent imports and functions
+#-----------------------------------------------------------------------------
+
+if os.name == 'posix':
+    import select
+
+    def stdin_ready():
+        infds, outfds, erfds = select.select([sys.stdin],[],[],0)
+        if infds:
+            return True
+        else:
+            return False
+
+elif sys.platform == 'win32':
+    import msvcrt
+
+    def stdin_ready():
+        return msvcrt.kbhit()
+
+#-----------------------------------------------------------------------------
+# Callback functions
+#-----------------------------------------------------------------------------
+
+def glut_display():
+    # Dummy display function
+    pass
+
+def glut_idle():
+    # Dummy idle function
+    pass
+
+def glut_close():
+    # Close function only hides the current window
+    glut.glutHideWindow()
+    glutMainLoopEvent()
+
+def glut_int_handler(signum, frame):
+    # Catch sigint and print the default message
+    signal.signal(signal.SIGINT, signal.default_int_handler)
+    print('\nKeyboardInterrupt')
+    # Need to reprint the prompt at this stage
+
+
+
+#-----------------------------------------------------------------------------
+# Code
+#-----------------------------------------------------------------------------
+def inputhook_glut():
+    """Run the pyglet event loop by processing pending events only.
+
+    This keeps processing pending events until stdin is ready.  After
+    processing all pending events, a call to time.sleep is inserted.  This is
+    needed, otherwise, CPU usage is at 100%.  This sleep time should be tuned
+    though for best performance.
+    """
+    # We need to protect against a user pressing Control-C when IPython is
+    # idle and this is running. We trap KeyboardInterrupt and pass.
+
+    signal.signal(signal.SIGINT, glut_int_handler)
+
+    try:
+        t = clock()
+
+        # Make sure the default window is set after a window has been closed
+        if glut.glutGetWindow() == 0:
+            glut.glutSetWindow( 1 )
+            glutMainLoopEvent()
+            return 0
+
+        while not stdin_ready():
+            glutMainLoopEvent()
+            # We need to sleep at this point to keep the idle CPU load
+            # low.  However, if sleep to long, GUI response is poor.  As
+            # a compromise, we watch how often GUI events are being processed
+            # and switch between a short and long sleep time.  Here are some
+            # stats useful in helping to tune this.
+            # time    CPU load
+            # 0.001   13%
+            # 0.005   3%
+            # 0.01    1.5%
+            # 0.05    0.5%
+            used_time = clock() - t
+            if used_time > 10.0:
+                # print 'Sleep for 1 s'  # dbg
+                time.sleep(1.0)
+            elif used_time > 0.1:
+                # Few GUI events coming in, so we can sleep longer
+                # print 'Sleep for 0.05 s'  # dbg
+                time.sleep(0.05)
+            else:
+                # Many GUI events coming in, so sleep only very little
+                time.sleep(0.001)
+    except KeyboardInterrupt:
+        pass
+    return 0