usage of ElementArrayStim disables color of ShapeStim

[Yuri Spitsyn]

Just run this test (for comparison I also added PatchStim which
behaves nicely):

from psychopy import visual, core

mywin = visual.Window([800,600], units="pix", color=-1)
patch = visual.PatchStim(win=mywin, tex='sin', mask='gauss',
units='pix', size=800)
earray = visual.ElementArrayStim(win=mywin, texRes=128, nElements=10,
sizes=60, fieldSize=500)
v=100
square = visual.ShapeStim(win=mywin, vertices=[[-v,-v],[-v,v],[v,v],
[v,-v]], lineWidth=5, lineColor='red', fillColor='yellow')

patch.draw()
mywin.flip()
core.wait(1)

square.draw()
mywin.flip()
core.wait(1)

earray.draw()
mywin.flip()
core.wait(1)

square.draw()
mywin.flip()
core.wait(1)

[Yuri Spitsyn]

This is a continuation of the previous post.

The first time square.draw() shows red-outlined yellow-filled square.
After second square.draw() I see an all-grey square.
Anyone else is having the same result?

(I run PsychoPy on Mac OSX 10.6.8, ATI Radeon X1600 graphics card)

[Jeremy Gray]

yes, I see the same thing, mac 10.6.6 with NVIDIA GeForce 9400M

same thing with a 1-element elementArray:
earray = visual.ElementArrayStim(win=mywin, texRes=2, nElements=1,
sizes=1, fieldSize=1)

and same with pygame or when defining the square before defining the earray...

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[Jonathan Peirce]

Element array is leaving its texture shading program turned on at the
end of drawing (in case that means anything to you ;-) ).

To fix, insert the line
GL.glUseProgram(0)
somewhere towards the end of the ElementArray.draw() e.g. just before
GL.glPopClientAttrib() on line 3372
Or download the version I just committed at:

https://github.com/psychopy/psychopy/blob/6abc0f3c90fa77ec8f93c363ad8e25141d65d0a5/psychopy/visual.py

Thanks yuri, for the nice minimal example to help find the bug.

Jon

--
Dr. Jonathan Peirce
Nottingham Visual Neuroscience

http://www.peirce.org.uk/

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