This deletes the GLFW apprt from the Ghostty codebase.
The GLFW apprt was the original apprt used by Ghostty (well, before
Ghostty even had the concept of an "apprt" -- it was all just a single
application then). It let me iterate on the core terminal features,
rendering, etc. without bothering about the UI. It was a good way to get
started. But it has long since outlived its usefulness.
We've had a stable GTK apprt for Linux (and Windows via WSL) and a
native macOS app via libghostty for awhile now. The GLFW apprt only
remained within the tree for a few reasons:
1. Primarily, it provided a faster feedback loop on macOS because
building the macOS app historically required us to hop out of the
zig build system and into Xcode, which is slow and cumbersome.
2. It was a convenient way to narrow whether a bug was in the
core Ghostty codebase or in the apprt itself. If a bug was in both
the glfw and macOS app then it was likely in the core.
3. It provided us a way on macOS to test OpenGL.
All of these reasons are no longer valid. Respectively:
1. Our Zig build scripts now execute the `xcodebuild` CLI directly and
can open the resulting app, stream logs, etc. This is the same
experience we have on Linux. (Xcode has always been a dependency of
building on macOS in general, so this is not cumbersome.)
2. We have a healthy group of maintainers, many of which have access
to both macOS and Linux, so we can quickly narrow down bugs
regardless of the apprt.
3. Our OpenGL renderer hasn't been compatible with macOS for some time
now, so this is no longer a useful feature.
At this point, the GLFW apprt is just a burden. It adds complexity
across the board, and some people try to run Ghostty with it in the real
world and get confused when it doesn't work (it's always been lacking in
features and buggy compared to the other apprts).
So, it's time to say goodbye. Its bittersweet because it is a big part
of Ghostty's history, but we've grown up now and it's time to move on.
Thank you, goodbye.
(NOTE: If you are a user of the GLFW apprt, then please fork the project
prior to this commit or start a new project based on it. We've warned
against using it for a very, very long time now.)
Besides avoiding copying, this allows consumers to choose to allocate
these structs on the stack or to allocate on the heap. It also gives the
apprt.App a stable pointer sooner in the process.
This introduces a new package `src/synthetic` for generating synthetic
data, currently primarily for benchmarking but other use cases can
emerge.
The synthetic package exports a runtime-dispatched type `Generator` that
can generate data of various types. To start, we have a bytes, utf8,
and OSC generator. The goal of each generator is to expose knobs to tune the
probabilities of various outcomes. For example, the UTF-8 generator has
a knob to tune the probability of generating 1, 2, 3, or 4-byte UTF-8
sequences.
Ultimately, the goal is to be able to collect probability data
empirically that we can then use for benchmarks so we can optimize
various parts of the codebase on real-world data shape distributions.
This commit adds a few new mode flags to the `bench-stream` program
to generator synthetic OSC sequences. The new modes are `gen-osc`,
`gen-osc-valid`, and `gen-osc-invalid`. The `gen-osc` mode generates
equal parts valid and invalid OSC sequences, while the suffixed variants
are for generating only valid or invalid sequences, respectively.
This commit also fixes our build system to actually be able to build the
benchmarks. It turns out we were just rebuilding the main Ghostty binary
for `-Demit-bench`. And, our benchmarks didn't run under Zig 0.14, which
is now fixed.
An important new design I'm working towards in this commit is to split
out synthetic data generation to a dedicated package in
`src/bench/synth` although I'm tempted to move it to `src/synth` since
it may be useful outside of benchmarks.
The synth package is a work-in-progress, but it contains a hint of
what's to come. I ultimately want to able to generate all kinds of
synthetic data with a lot of knobs to control dimensionality (e.g. in
the case of OSC sequences: valid/invalid, length, operation types,
etc.).
Related to #3224
Previously, Ghostty used a static API for async event handling: io_uring
on Linux, kqueue on macOS. This commit changes the backend to be dynamic
on Linux so that epoll will be used if io_uring isn't available, or if
the user explicitly chooses it.
This introduces a new config `async-backend` (default "auto") which can
be set by the user to change the async backend in use. This is a
best-effort setting: if the user requests io_uring but it isn't
available, Ghostty will fall back to something that is and that choice
is up to us.
Basic benchmarking both in libxev and Ghostty (vtebench) show no
noticeable performance differences introducing the dynamic API, nor
choosing epoll over io_uring.
Instead of "polling" to see if a quit timer has expired, start a single
timer that expires after the confiugred delay when no more surfaces are
open. That timer can be cancelled if necessary.
