[visionegg] Re: screen.clear() requires 40ms....
- From: Andrew Straw <andrew.straw@xxxxxxxxxxxxxxx>
- To: visionegg@xxxxxxxxxxxxx
- Date: Wed, 27 Aug 2003 21:01:46 +0930
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Dear Christoph,
My best guess is that OpenGL itself must be taking so long, but this
seems very strange. What drivers and hardware are you using? The
clear() method is a fairly minimal wrapping of glClear():
def clear(self):
"""Called by Presentation instance. Clear the screen."""
c = self.parameters.bgcolor # Shorthand
if len(c) == 4:
gl.glClearColor(*c)
else:
gl.glClearColor(c[0],c[1],c[2],0.0) # set alpha to 0.0
unless specified
gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT)
I don't really have any hints at this point, except to make sure you're
not doing something silly... Perhaps try with a minimal program that
just calls screen.clear() and then add various bits until you find
something that makes it start taking so long. (Or maybe it already
takes so long with a minimal program?)
Cheers!
Andrew
On Wednesday, Aug 27, 2003, at 20:31 Australia/Adelaide, Christoph
Lehmann wrote:
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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