Quietly export this function mainly for the benefit
of libadwaita, which can can use this to install its
implementation of the gtk-inspector-page extension
point.
Silly optimization to get rid of
gtk_main_do_event
gtk_inspector_handle_event
gtk_inspector_window_get_for_display
g_object_get_data
showing up in profiles even though it's useless since we've never even
created any inspector window in the first place.
When configuring the inspector display, preserve
debug flags that affect which GL variant we pick.
Otherwise, we may end up with a GLX context on the
default display, and an EGL context on the inspector
one. This hopelessly confuses libepoxy, and things
don't go well when that happens.
Avoid a nested listbox, show the connector,
don't show information we don't have. Also,
disconnect all signal handlers from the display
when the inspector is going away.
Respect the debug settings for disabling Vulkan or GL,
and do not try to initialize those contexts. This can
be necessary to work around crashes.
Fixes: #3748
Ever since we added surface-to-widget transforms,
the autofading of the fps overlay did not work anymore,
since it was given the transient transform node, most
of the time.
Fix this by passing both the root of the node tree and
the node for the toplevel widget to prepare_render, and
hande the widget node to the overlays. Update the
affected overlays that need to have their positioning
adjusted.
The primary goal here was to cleanup the current GL renderer to make
maintenance easier going forward. Furthermore, it tracks state to allow
us to implement more advanced renderer features going forward.
Reordering
This renderer will reorder batches by render target to reduce the number
of times render targets are changed.
In the future, we could also reorder by program within the render target
if we can determine that vertices do not overlap.
Uniform Snapshots
To allow for reordering of batches all uniforms need to be tracked for
the programs. This allows us to create the full uniform state when the
batch has been moved into a new position.
Some care was taken as it can be performance sensitive.
Attachment Snapshots
Similar to uniform snapshots, we need to know all of the texture
attachments so that we can rebind them when necessary.
Render Jobs
To help isolate the process of creating GL commands from the renderer
abstraction a render job abstraction was added. This could be extended
in the future if we decided to do tiling.
Command Queue
Render jobs create batches using the command queue. The command queue
will snapshot uniform and attachment state so that it can reorder
batches right before executing them.
Currently, the only reordering done is to ensure that we only visit
each render target once. We could extend this by tracking vertices,
attachments, and others.
This code currently uses an inline array helper to reduce overhead
from GArray which was showing up on profiles. It could be changed to
use GdkArray without too much work, but had roughly double the
instructions. Cycle counts have not yet been determined.
GLSL Programs
This was simplified to use XMACROS so that we can just extend one file
(gskglprograms.defs) instead of multiple places. The programs are added
as fields in the driver for easy access.
Driver
The driver manages textures, render targets, access to atlases,
programs, and more. There is one driver per display, by using the
shared GL context.
Some work could be done here to batch uploads so that we make fewer
calls to upload when sending icon theme data to the GPU. We'd need
to keep a copy of the atlas data for such purposes.
We have a region for the border here, but the color is defined as
transparent black because we don't want to render anything for it.
This way, the generated .node file for the listbox demo in gtk4-demo
with enabled layout borders is 3.5MB instead of 3.8MB.
