https://bugs.documentfoundation.org/show_bug.cgi?id=101321
--- Comment #3 from V Stuart Foote <vstuart.fo...@utsa.edu> ---
A computer has a Graphics Processing Unit that composes the what the operating
system and individual programs render to the display.
The GPU can have some form of hardware acceleration to offload processing from
the CPU. The OS and drivers for the GPU will negotiate the amount of off
loading.
OpenGL rendering provides an additional application programming interface that
the OS and running programs can use to accelerate rendering, making more use of
a GPUs processing capabilities.
Without OpenGL, the OS and GPU can still use hardware acceleration just not to
the full potential capacity of the GPU. And that hardware acceleration can be
further limited and the OS under program control performs the rendering.
In LibreOffice modules that can make use of OpenGL are enabled with the Tools
-> Options -> View controls. The downside is that if the OS / GPU / Driver
implementation are not adequate to the task visual glitches of varying severity
can occur.
On Windows OpenGL is enabled by default--if the GPU / Driver pairing passes a
blacklist and simple functional check on launch. If marginal or blacklisted,
OpenGL rendering is disabled for that user profile. Visual glitches that appear
otherwise can be avoided by disabling OpenGL rendering.
On Linux OpenGL is disabled by default because there are just too many
combinations of OS / CPU / GPU and drivers to reliably have it enabled. And,
users on Linux seem to have fewer issues in enabling performance features for
their OS / Desktop environment including use of OpenGL if they find it to be
stable.
We're of course glad you've sorted things on your system. But we still need the
details of OS / GPU / and Driver for the version of LibreOffice you had this
issue with.
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