[visionegg] screen.clear() requires 40ms....
- From: Christoph Lehmann <lehmann@xxxxxxxxxxxx>
- To: visionegg@xxxxxxxxxxxxx
- Date: Wed, 27 Aug 2003 13:01:12 +0200
Hi Andrew
the VE-fMRI project goes on..now I can read in by means of a simple GUI (thanks
to wxPython) the subject ID and the stimulus-file (where the to be shown
stimuli are listed).
One problem: the following code snippet is the essential part yielding a
problem:
this code shows me (my_debug_msg), that the screen.clear() routine takes most
of the times between 20 and 60ms.
..why this?
while (not pygame.event.peek((QUIT,KEYDOWN))):
while (not TRIGGER_RECEIVED):
poll the Lpt...
my_debug_msg.append('before clear.screen [ms]: ' + str(1000 *
(VisionEgg.time_func()-start_time)) )
screen.clear()
my_debug_msg.append('after clear screen [ms]: ' + str(1000 *
(VisionEgg.time_func()-start_time)) )
viewport.parameters.stimuli = [preloaded_stimulus_list[stim_index]] #update
the viewport
viewport.draw()
swap_buffers()
--
I cannot explain it.
Thanks for a hint
christoph
--
p.s.
the preloaded_stimulus_list[stim_index] comes from:
--
# Create a list of TextureStimulus instances, one with each of your texture
images.
preloaded_stimulus_list = [] #empty at first
for stim_index in range(num_images): #for all stimuli
except the null-event create a texture object
if not photoX[stim_index] == nullevent:
# Read the texture file
texture = Texture(photoX[stim_index])
# Add to list of TEXTURES
x = screen.size[0]/2 - texture.size[0]/2
y = screen.size[1]/2 - texture.size[1]/2
# Load the texture to OpenGL, prepare for display
stimulus = TextureStimulus(texture = texture,size = texture.size,
lowerleft=(x,y))
else: #for the
nullevent, just append the nullevent-indicator
stimulus = nullevent
# Add to list of stimuli
preloaded_stimulus_list.append( stimulus )
viewport = Viewport( screen=screen)
--
--
Christoph Lehmann <lehmann@xxxxxxxxxxxx>
University Hospital of Clinical Psychiatry
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