|
|
"""GLUT Input hook for interactive use with prompt_toolkit
|
|
|
"""
|
|
|
|
|
|
|
|
|
# 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.
|
|
|
|
|
|
import sys
|
|
|
import time
|
|
|
import signal
|
|
|
import OpenGL.GLUT as glut
|
|
|
import OpenGL.platform as platform
|
|
|
from timeit import default_timer as clock
|
|
|
|
|
|
# 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.''')
|
|
|
|
|
|
|
|
|
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 defaultipyt message
|
|
|
signal.signal(signal.SIGINT, signal.default_int_handler)
|
|
|
print('\nKeyboardInterrupt')
|
|
|
# Need to reprint the prompt at this stage
|
|
|
|
|
|
# Initialisation code
|
|
|
glut.glutInit( sys.argv )
|
|
|
glut.glutInitDisplayMode( glut_display_mode )
|
|
|
# This is specific to freeglut
|
|
|
if bool(glut.glutSetOption):
|
|
|
glut.glutSetOption( glut.GLUT_ACTION_ON_WINDOW_CLOSE,
|
|
|
glut.GLUT_ACTION_GLUTMAINLOOP_RETURNS )
|
|
|
glut.glutCreateWindow( b'ipython' )
|
|
|
glut.glutReshapeWindow( 1, 1 )
|
|
|
glut.glutHideWindow( )
|
|
|
glut.glutWMCloseFunc( glut_close )
|
|
|
glut.glutDisplayFunc( glut_display )
|
|
|
glut.glutIdleFunc( glut_idle )
|
|
|
|
|
|
|
|
|
def inputhook(context):
|
|
|
"""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 context.input_is_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
|
|
|
|
