Multiple windows?

[tommct]

I am trying to make multiple windows with glumpy. Is this possible?
I've tried new threads and simply making multiple figures, but it only
crashes.

[Nicolas Rougier]

OpenGL must be in the main thread, that may be the cause of your crashes.

As for multiple windows, it depends on your GLUT implementation. The easiest would be to have a better toolkit like gtk or KDE.  It requires to write a backend_gtk.py or backend_kde.py.

Nicolas

[mib...@gmail.com]

Same problem here. Is there no way to have multiple windows? The app-two-windows example works, but it does not draw anything.

[Nicolas Rougier]

The app-two-windows.py example show how to have two windows. If you want to draw something, you'll have to populate the on_draw functions with something.

Nicolas

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[mib...@gmail.com]

That's what I do. But then it crashes constantly. So I think I'll need something additional to be able to have multiple windows, but I don't know what. I will try to create a minimum example that causes the crash.

[mib...@gmail.com]

So for example the example gloo-triangular-grid. I just doubled everything, and I get the following error:

[i] HiDPI detected, fixing window size

[i] Using GLFW (GL 2.1)

[i] HiDPI detected, fixing window size

[i] Using GLFW (GL 2.1)

[i] Running at 60 frames/second

Traceback (most recent call last):

  File "/Users/michael/software/glumpy/examples/gloo-triangular-grid-2-windows.py", line 55, in <module>

    app.run()

  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/glumpy/app/__init__.py", line 343, in run

    run(duration, framecount)

  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/glumpy/app/__init__.py", line 329, in run

    count = __backend__.process(dt)

  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/glumpy/app/window/backends/backend_glfw.py", line 408, in process

    window.dispatch_event('on_draw', dt)

  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/glumpy/app/window/event.py", line 384, in dispatch_event

    if handler(*args):

  File "/Users/michael/software/glumpy/examples/gloo-triangular-grid-2-windows.py", line 45, in on_draw

    program1.draw(gl.GL_TRIANGLES, indices.reshape(-1).astype(np.uint32).view(gloo.IndexBuffer))

  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/glumpy/gloo/program.py", line 592, in draw

    self.activate()

  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/glumpy/gloo/globject.py", line 89, in activate

    self._activate()

  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/glumpy/gloo/program.py", line 377, in _activate

    gl.glUseProgram(self.handle)

  File "errorchecker.pyx", line 53, in OpenGL_accelerate.errorchecker._ErrorChecker.glCheckError (src/errorchecker.c:1218)

OpenGL.error.GLError: GLError(

err = 1281,

description = b'invalid value',

baseOperation = glUseProgram,

cArguments = (1,)

)

[Nicolas Rougier]

Got the same error. It's a problem with context when you're creating your program.
Here is a corrected version, you'll need latest github glumpy (I've made a few changes).

[mib...@gmail.com]

I just tested the fix. It works! Now I'll try to incorporate it into my application, let's see...

Thank's a lot Nicolas for that very quick fix. So far it's been a real pleasure to work with glumpy :-)

Michael

[mib...@gmail.com]

Unfortunately, it does not work properly. Seems that at least the point size is now ignored for the second window...

I added a code to reproduce the problem. The blue point is just a very small dot, while the red one is displayed properly.

[Nicolas Rougier]

Could you open an issue on github please ?

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> <app-two-programs-two-windows.py>

[mib...@gmail.com]

I'll do that as soon as possible.