This uses the same plumbing as the software frontend, but tries
to enable opengl.
None of the opengl rendering is plumbed through here yet, so this
is currently functionally identical to the software renderer.
Tested only on windows with a USB serial connector to my NUC running
linux.
This allows opening up wezterm on a serial port connection.
Serial is closer to a tty than a pty, so it is a bit different
to configure and use.
This commit allows running:
```
wezterm serial COM3
```
to open a window that connects to the specified COM port.
You can change the baud rate with:
```
wezterm serial --baud 9600 COM3
```
There are more options that could be set, but I'm a bit lazy and
have only exposed the baud rate to the wezterm cli so far.
In the early days we relied upon the bounded length of a sync channel
to put back pressure on the output from a child command. We're no
longer using that kind of channel, so here's a more deliberate and
measurable rate limiting implementation.
The `ratelimit_output_bytes_per_second` configuration setting defaults
to 2MB/s and constrains the amount of text we send to the escape
sequence parser.
This value was selected based on it being a combination of responsive
to ctrl-c while outputing a lot of data and still generating sleeps
to remain within the constraints.
This does mean that terminal benchmarks that test how quickly you
can dump text to the terminal will hit this artifical upper limit
and are thus not going to be a true measure of performance.
It's taking a while for https://github.com/jwilm/vte/pull/20 to get
merged, so point to my branch directly while I build out some
tunneled mux protocol escape sequences.
I'll need to fork vte on crates.io if vte doesn't merge the PR
before the next termwiz crate bump.
This removes some awkwardness in the impl by allowing casting
to a concrete implementation. This is a pattern I want to use
more widely and this diff proves the concept.
When enabled, the windows version will use winpty rather than conpty.
This potentially allows running on older windows versions but has
a few caveats:
* Requires winpty.dll and winpty-agent.exe be in the PATH
* The initial screen / cursor position looks funky for me with the
latest release of winpty, but that is from a couple of years ago
* Mouse reporting doesn't work, perhaps for the same reasons that
it isn't working in conpty.
I want to make this into a runtime selectable feature before tidying
up the installation aspects; we need that plumbing anyway to be
able to select between local and remote mux'd tabs.
This is primarily for macos where the default freetype
installation is unable to render color emoji, but should also
help make things more consistent across the various platforms.
It's a little bit awkward on linux because the font-loader crate
pulls in the now-conflicting servo-font* crates. I've disabled
font-loader on linux systems; it's just calling fontconfig under
the covers anyway.
