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PySide6 backend causes application to flash on creation of opengl context #2489

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hmaarrfk opened this issue May 22, 2023 · 4 comments
Open

PySide6 backend causes application to flash on creation of opengl context #2489

hmaarrfk opened this issue May 22, 2023 · 4 comments

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@hmaarrfk
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OS: Ubuntu 23.04
Desktop Backend: Wayland
Qt6 backend: X11

Upon creation of a scene, it seems that the main window gets destroyed before getting recreated with the scene.

Maybe I'm passing in the wrong object?

Screencast.from.2023-05-21.21-17-36.webm
mamba list 
# packages in environment at /home/mark/mambaforge/envs/vispy:
#
# Name                    Version                   Build  Channel
_libgcc_mutex             0.1                 conda_forge    conda-forge
_openmp_mutex             4.5                       2_gnu    conda-forge
alsa-lib                  1.2.8                h166bdaf_0    conda-forge
attr                      2.5.1                h166bdaf_1    conda-forge
bzip2                     1.0.8                h7f98852_4    conda-forge
ca-certificates           2023.5.7             hbcca054_0    conda-forge
cairo                     1.16.0            h35add3b_1015    conda-forge
cython                    0.29.34         py310heca2aa9_0    conda-forge
dbus                      1.13.6               h5008d03_3    conda-forge
double-conversion         3.2.0                h27087fc_1    conda-forge
expat                     2.5.0                hcb278e6_1    conda-forge
font-ttf-dejavu-sans-mono 2.37                 hab24e00_0    conda-forge
font-ttf-inconsolata      3.000                h77eed37_0    conda-forge
font-ttf-source-code-pro  2.038                h77eed37_0    conda-forge
font-ttf-ubuntu           0.83                 hab24e00_0    conda-forge
fontconfig                2.14.2               h14ed4e7_0    conda-forge
fonts-conda-ecosystem     1                             0    conda-forge
fonts-conda-forge         1                             0    conda-forge
freetype                  2.12.1               hca18f0e_1    conda-forge
freetype-py               2.4.0                    pypi_0    pypi
gettext                   0.21.1               h27087fc_0    conda-forge
glib                      2.76.2               hfc55251_0    conda-forge
glib-tools                2.76.2               hfc55251_0    conda-forge
graphite2                 1.3.13            h58526e2_1001    conda-forge
gst-plugins-base          1.22.0               h4243ec0_2    conda-forge
gstreamer                 1.22.0               h25f0c4b_2    conda-forge
harfbuzz                  7.3.0                hdb3a94d_0    conda-forge
hsluv                     5.0.3                    pypi_0    pypi
icu                       72.1                 hcb278e6_0    conda-forge
keyutils                  1.6.1                h166bdaf_0    conda-forge
kiwisolver                1.4.4                    pypi_0    pypi
krb5                      1.20.1               h81ceb04_0    conda-forge
lame                      3.100             h166bdaf_1003    conda-forge
ld_impl_linux-64          2.40                 h41732ed_0    conda-forge
lerc                      4.0.0                h27087fc_0    conda-forge
libblas                   3.9.0           16_linux64_openblas    conda-forge
libcap                    2.67                 he9d0100_0    conda-forge
libcblas                  3.9.0           16_linux64_openblas    conda-forge
libclang                  15.0.7          default_h7634d5b_2    conda-forge
libclang13                15.0.7          default_h9986a30_2    conda-forge
libcups                   2.3.3                h36d4200_3    conda-forge
libdeflate                1.18                 h0b41bf4_0    conda-forge
libdrm                    2.4.114              h166bdaf_0    conda-forge
libedit                   3.1.20191231         he28a2e2_2    conda-forge
libexpat                  2.5.0                hcb278e6_1    conda-forge
libffi                    3.4.2                h7f98852_5    conda-forge
libflac                   1.4.2                h27087fc_0    conda-forge
libgcc-ng                 12.2.0              h65d4601_19    conda-forge
libgcrypt                 1.10.1               h166bdaf_0    conda-forge
libgfortran-ng            12.2.0              h69a702a_19    conda-forge
libgfortran5              12.2.0              h337968e_19    conda-forge
libglib                   2.76.2               hebfc3b9_0    conda-forge
libgomp                   12.2.0              h65d4601_19    conda-forge
libgpg-error              1.46                 h620e276_0    conda-forge
libiconv                  1.17                 h166bdaf_0    conda-forge
libjpeg-turbo             2.1.5.1              h0b41bf4_0    conda-forge
liblapack                 3.9.0           16_linux64_openblas    conda-forge
libllvm15                 15.0.7               hadd5161_1    conda-forge
libnsl                    2.0.0                h7f98852_0    conda-forge
libogg                    1.3.4                h7f98852_1    conda-forge
libopenblas               0.3.21          pthreads_h78a6416_3    conda-forge
libopus                   1.3.1                h7f98852_1    conda-forge
libpciaccess              0.17                 h166bdaf_0    conda-forge
libpng                    1.6.39               h753d276_0    conda-forge
libpq                     15.3                 hbcd7760_1    conda-forge
libsndfile                1.2.0                hb75c966_0    conda-forge
libsqlite                 3.42.0               h2797004_0    conda-forge
libstdcxx-ng              12.2.0              h46fd767_19    conda-forge
libsystemd0               253                  h8c4010b_1    conda-forge
libtiff                   4.5.0                ha587672_6    conda-forge
libuuid                   2.38.1               h0b41bf4_0    conda-forge
libvorbis                 1.3.7                h9c3ff4c_0    conda-forge
libwebp-base              1.3.0                h0b41bf4_0    conda-forge
libxcb                    1.13              h7f98852_1004    conda-forge
libxkbcommon              1.5.0                h79f4944_1    conda-forge
libxml2                   2.10.4               hfdac1af_0    conda-forge
libxslt                   1.1.37               h873f0b0_0    conda-forge
libzlib                   1.2.13               h166bdaf_4    conda-forge
lz4-c                     1.9.4                hcb278e6_0    conda-forge
mpg123                    1.31.3               hcb278e6_0    conda-forge
mysql-common              8.0.32               hf1915f5_2    conda-forge
mysql-libs                8.0.32               hca2cd23_2    conda-forge
ncurses                   6.3                  h27087fc_1    conda-forge
numpy                     1.24.3          py310ha4c1d20_0    conda-forge
openssl                   3.1.0                hd590300_3    conda-forge
packaging                 23.1               pyhd8ed1ab_0    conda-forge
pcre2                     10.40                hc3806b6_0    conda-forge
pip                       23.1.2             pyhd8ed1ab_0    conda-forge
pixman                    0.40.0               h36c2ea0_0    conda-forge
pthread-stubs             0.4               h36c2ea0_1001    conda-forge
pulseaudio-client         16.1                 h5195f5e_3    conda-forge
pyside6                   6.5.0           py310hc900f1c_1    conda-forge
python                    3.10.11         he550d4f_0_cpython    conda-forge
python_abi                3.10                    3_cp310    conda-forge
qt6-main                  6.5.0                hae41e4f_6    conda-forge
qtpy                      2.3.1              pyhd8ed1ab_0    conda-forge
readline                  8.2                  h8228510_1    conda-forge
setuptools                67.7.2             pyhd8ed1ab_0    conda-forge
tk                        8.6.12               h27826a3_0    conda-forge
tzdata                    2023c                h71feb2d_0    conda-forge
vispy                     0.0.0                    pypi_0    pypi
wheel                     0.40.0             pyhd8ed1ab_0    conda-forge
xcb-util                  0.4.0                h516909a_0    conda-forge
xcb-util-cursor           0.1.4                hd590300_0    conda-forge
xcb-util-image            0.4.0                h166bdaf_0    conda-forge
xcb-util-keysyms          0.4.0                h516909a_0    conda-forge
xcb-util-renderutil       0.3.9                h166bdaf_0    conda-forge
xcb-util-wm               0.4.1                h516909a_0    conda-forge
xkeyboard-config          2.38                 h0b41bf4_0    conda-forge
xorg-kbproto              1.0.7             h7f98852_1002    conda-forge
xorg-libice               1.0.10               h7f98852_0    conda-forge
xorg-libsm                1.2.3             hd9c2040_1000    conda-forge
xorg-libx11               1.8.4                h0b41bf4_0    conda-forge
xorg-libxau               1.0.11               hd590300_0    conda-forge
xorg-libxdmcp             1.1.3                h7f98852_0    conda-forge
xorg-libxext              1.3.4                h0b41bf4_2    conda-forge
xorg-libxrender           0.9.10            h7f98852_1003    conda-forge
xorg-renderproto          0.11.1            h7f98852_1002    conda-forge
xorg-xextproto            7.3.0             h0b41bf4_1003    conda-forge
xorg-xproto               7.0.31            h7f98852_1007    conda-forge
xz                        5.2.6                h166bdaf_0    conda-forge
zlib                      1.2.13               h166bdaf_4    conda-forge
zstd                      1.5.2                h3eb15da_6    conda-forge

After installing: qt6-wayland adwaita-qt6 qgnomeplatform6 for better integration with wayland, the problem still persists:
Screencast from 2023-05-21 21-21-39.webm

I guess the problem "goes away" if you create the scene as part of the __init__ for the main window.

I haven't done an exhaustive search, but I'm pretty sure the problem doesn't appear if PySide2 is used mostly because I observed this when trying to see if we were ready for pyside6.
@djhoese
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djhoese commented May 22, 2023

Can you try creating the app instance like this in the main function:

    app = use_app("pyside6")
    app.create()

That would obviously be the vispy version of the app which I think is a wrapper around the native Qt/PySide app. I see you keep a handle on it in the __init__ but don't use it in this example. Maybe try removing that regardless for debugging purposes?

@hmaarrfk
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sorry for my very late reply.
By using the vispy app:

def main():
    from vispy.app import use_app
    app = use_app('pyside6')
    app.create()

    main_window = MainWin(app)
    main_window.show()

    return app.run()

Whether or not I keep a reference of the app doesn't seem to change the behavior.

Screencast.from.2023-06-17.09-43-44.webm

@hmaarrfk
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Tracking things with ipdb I can catch the flash happening on this line of code:
https://github.com/vispy/vispy/blob/main/vispy/app/backends/_qt.py#L840

@hmaarrfk
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also seems to happen on windows.
https://stackoverflow.com/questions/76887079/opengl-causes-pyside6-pyqt6-application-to-reload-itself

@hmaarrfk hmaarrfk changed the title PySide6 + Wayland backend causes application to flash on creation of opengl context PySide6 backend causes application to flash on creation of opengl context Dec 6, 2023
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@hmaarrfk @djhoese