[official] Linux port via Blade (#7343)

Mikayla Maki created

## Motivation

I :heart: Zed! It's lightning fast and has great UX. I want it to run as
well on all major platforms. I'm currently using Linux most actively.
[Blade](https://github.com/kvark/blade) is a good candidate for
providing GPU access: it supports Vulkan, Metal, and GLES/WebGL. Its
abstraction is extremely thin, while having one of the nicest GPU APIs.
Codebase is also tiny. Checkout [the meetup
recording](https://www.youtube.com/watch?v=63dnzjw4azI&t=623s) from a
year ago.
I believe these projects make a good match :rocket: !

### Why this is a bad idea

If Zed team wants to use off-the-shelf components from Rust ecosystem,
then Blade is certainly at disadvantage here, since it's not widely
used. It would rely on Zed team adding necessary features in a branch,
then maybe upstreaming some of them. That is to say, it's unclear if
this can be avoided with more popular alternatives - being flexible with
any local changes is a good ability.

### Why it's not too bad

Blade uses [WGSL](https://www.w3.org/TR/WGSL) shaders, similar to `wgpu`
and `arcana`, but without the binding decorations. So this aspect of the
product is nicely portable.

## Progress

- [ ] Platforms
  - [x] X11 (via xcb)
    - [ ] input handling
    - [ ] get proper content size
  - [ ] Windows
  - [ ] Replace the existing Metal backend
- [ ] Text System
  - [ ] shaping
  - [ ] glyph rasterization
- [x] Texture atlas
- [ ] Rendering
  - [x] basic primitives
  - [x] path rendering
  - [x] sprite rendering
- [ ] media surfaces
- [ ] CI

## Current status
Zed starts up but crashes on text-system related checks.

![zed-linux-1](https://github.com/zed-industries/zed/assets/107301/ba536218-4d2c-43c9-ae6c-bef69b54bd0c)

Change summary

Cargo.lock                                       | 274 ++++++++
Cargo.toml                                       |   5 
crates/fs/src/fs.rs                              |   7 
crates/gpui/Cargo.toml                           |  14 
crates/gpui/build.rs                             |   6 
crates/gpui/examples/hello_world.rs              |   5 
crates/gpui/src/elements/img.rs                  |   4 
crates/gpui/src/gpui.rs                          |   3 
crates/gpui/src/platform.rs                      |   9 
crates/gpui/src/platform/linux.rs                |  18 
crates/gpui/src/platform/linux/blade_atlas.rs    | 361 +++++++++++
crates/gpui/src/platform/linux/blade_belt.rs     | 100 +++
crates/gpui/src/platform/linux/blade_renderer.rs | 506 ++++++++++++++++
crates/gpui/src/platform/linux/dispatcher.rs     | 134 ++++
crates/gpui/src/platform/linux/display.rs        |  41 +
crates/gpui/src/platform/linux/platform.rs       | 381 ++++++++++++
crates/gpui/src/platform/linux/shaders.wgsl      | 569 ++++++++++++++++++
crates/gpui/src/platform/linux/text_system.rs    | 127 ++++
crates/gpui/src/platform/linux/window.rs         | 425 +++++++++++++
crates/gpui/src/platform/mac/metal_atlas.rs      |   1 
crates/gpui/src/platform/test.rs                 |   3 
crates/gpui/src/platform/test/platform.rs        |   6 
crates/gpui/src/platform/test/text_system.rs     |  59 +
crates/gpui/src/platform/test/window.rs          |   1 
crates/gpui/src/scene.rs                         |   5 
crates/gpui/src/window/element_cx.rs             |  13 
crates/live_kit_client/Cargo.toml                |   7 
crates/live_kit_client/src/test.rs               |   8 
crates/media/Cargo.toml                          |   2 
crates/media/src/media.rs                        |   1 
crates/project/src/terminals.rs                  |   6 
crates/util/src/paths.rs                         |  65 +
crates/zed/build.rs                              |  34 
crates/zed/src/app_menus.rs                      |   1 
crates/zed/src/languages.rs                      |   3 
crates/zed/src/main.rs                           |   6 
rust-toolchain.toml                              |   2 
script/linux                                     |  43 +
38 files changed, 3,188 insertions(+), 67 deletions(-)

Detailed changes

Cargo.lock 🔗

@@ -267,12 +267,38 @@ version = "0.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "96d30a06541fbafbc7f82ed10c06164cfbd2c401138f6addd8404629c4b16711"
 
+[[package]]
+name = "as-raw-xcb-connection"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "175571dd1d178ced59193a6fc02dde1b972eb0bc56c892cde9beeceac5bf0f6b"
+
 [[package]]
 name = "ascii"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d92bec98840b8f03a5ff5413de5293bfcd8bf96467cf5452609f939ec6f5de16"
 
+[[package]]
+name = "ash"
+version = "0.37.3+1.3.251"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "39e9c3835d686b0a6084ab4234fcd1b07dbf6e4767dce60874b12356a25ecd4a"
+dependencies = [
+ "libloading 0.7.4",
+]
+
+[[package]]
+name = "ash-window"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b912285a7c29f3a8f87ca6f55afc48768624e5e33ec17dbd2f2075903f5e35ab"
+dependencies = [
+ "ash",
+ "raw-window-handle 0.5.2",
+ "raw-window-metal",
+]
+
 [[package]]
 name = "assets"
 version = "0.1.0"
@@ -908,6 +934,46 @@ dependencies = [
  "wyz",
 ]
 
+[[package]]
+name = "blade-graphics"
+version = "0.3.0"
+source = "git+https://github.com/kvark/blade?rev=f35bc605154e210ab6190291235889b6ddad73f1#f35bc605154e210ab6190291235889b6ddad73f1"
+dependencies = [
+ "ash",
+ "ash-window",
+ "bitflags 2.4.1",
+ "block",
+ "bytemuck",
+ "codespan-reporting",
+ "core-graphics-types",
+ "glow",
+ "gpu-alloc",
+ "gpu-alloc-ash",
+ "hidden-trait",
+ "js-sys",
+ "khronos-egl",
+ "libloading 0.8.0",
+ "log",
+ "metal 0.25.0",
+ "mint",
+ "naga",
+ "objc",
+ "raw-window-handle 0.5.2",
+ "slab",
+ "wasm-bindgen",
+ "web-sys",
+]
+
+[[package]]
+name = "blade-macros"
+version = "0.2.1"
+source = "git+https://github.com/kvark/blade?rev=f35bc605154e210ab6190291235889b6ddad73f1#f35bc605154e210ab6190291235889b6ddad73f1"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.48",
+]
+
 [[package]]
 name = "block"
 version = "0.1.6"
@@ -1065,6 +1131,20 @@ name = "bytemuck"
 version = "1.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "374d28ec25809ee0e23827c2ab573d729e293f281dfe393500e7ad618baa61c6"
+dependencies = [
+ "bytemuck_derive",
+]
+
+[[package]]
+name = "bytemuck_derive"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "965ab7eb5f8f97d2a083c799f3a1b994fc397b2fe2da5d1da1626ce15a39f2b1"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.48",
+]
 
 [[package]]
 name = "byteorder"
@@ -1438,6 +1518,16 @@ dependencies = [
  "objc",
 ]
 
+[[package]]
+name = "codespan-reporting"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3538270d33cc669650c4b093848450d380def10c331d38c768e34cac80576e6e"
+dependencies = [
+ "termcolor",
+ "unicode-width",
+]
+
 [[package]]
 name = "collab"
 version = "0.44.0"
@@ -2751,6 +2841,7 @@ checksum = "55ac459de2512911e4b674ce33cf20befaba382d05b62b008afc1c8b57cbf181"
 dependencies = [
  "futures-core",
  "futures-sink",
+ "nanorand",
  "spin 0.9.8",
 ]
 
@@ -3124,8 +3215,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "be4136b2a15dd319360be1c07d9933517ccf0be8f16bf62a3bee4f0d618df427"
 dependencies = [
  "cfg-if 1.0.0",
+ "js-sys",
  "libc",
  "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasm-bindgen",
 ]
 
 [[package]]
@@ -3213,6 +3306,18 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "glow"
+version = "0.13.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bd348e04c43b32574f2de31c8bb397d96c9fcfa1371bd4ca6d8bdc464ab121b1"
+dependencies = [
+ "js-sys",
+ "slotmap",
+ "wasm-bindgen",
+ "web-sys",
+]
+
 [[package]]
 name = "go_to_line"
 version = "0.1.0"
@@ -3230,16 +3335,50 @@ dependencies = [
  "workspace",
 ]
 
+[[package]]
+name = "gpu-alloc"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fbcd2dba93594b227a1f57ee09b8b9da8892c34d55aa332e034a228d0fe6a171"
+dependencies = [
+ "bitflags 2.4.1",
+ "gpu-alloc-types",
+]
+
+[[package]]
+name = "gpu-alloc-ash"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2424bc9be88170e1a56e57c25d3d0e2dfdd22e8f328e892786aeb4da1415732"
+dependencies = [
+ "ash",
+ "gpu-alloc-types",
+ "tinyvec",
+]
+
+[[package]]
+name = "gpu-alloc-types"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "98ff03b468aa837d70984d55f5d3f846f6ec31fe34bbb97c4f85219caeee1ca4"
+dependencies = [
+ "bitflags 2.4.1",
+]
+
 [[package]]
 name = "gpui"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "as-raw-xcb-connection",
  "async-task",
  "backtrace",
  "bindgen 0.65.1",
  "bitflags 2.4.1",
+ "blade-graphics",
+ "blade-macros",
  "block",
+ "bytemuck",
  "cbindgen",
  "cocoa",
  "collections",
@@ -3251,6 +3390,7 @@ dependencies = [
  "dhat",
  "env_logger",
  "etagere",
+ "flume",
  "font-kit",
  "foreign-types 0.3.2",
  "futures 0.3.28",
@@ -3261,7 +3401,7 @@ dependencies = [
  "linkme",
  "log",
  "media",
- "metal",
+ "metal 0.21.0",
  "num_cpus",
  "objc",
  "ordered-float 2.10.0",
@@ -3271,6 +3411,7 @@ dependencies = [
  "png",
  "postage",
  "rand 0.8.5",
+ "raw-window-handle 0.5.2",
  "raw-window-handle 0.6.0",
  "refineable",
  "resvg",
@@ -3292,6 +3433,7 @@ dependencies = [
  "util",
  "uuid 1.4.1",
  "waker-fn",
+ "xcb",
 ]
 
 [[package]]
@@ -3428,6 +3570,23 @@ version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
 
+[[package]]
+name = "hexf-parse"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dfa686283ad6dd069f105e5ab091b04c62850d3e4cf5d67debad1933f55023df"
+
+[[package]]
+name = "hidden-trait"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68ed9e850438ac849bec07e7d09fbe9309cbd396a5988c30b010580ce08860df"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
 [[package]]
 name = "hkdf"
 version = "0.12.3"
@@ -3911,6 +4070,16 @@ dependencies = [
  "winapi-build",
 ]
 
+[[package]]
+name = "khronos-egl"
+version = "5.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d1382b16c04aeb821453d6215a3c80ba78f24c6595c5aa85653378aabe0c83e3"
+dependencies = [
+ "libc",
+ "libloading 0.8.0",
+]
+
 [[package]]
 name = "kqueue"
 version = "1.0.8"
@@ -4216,8 +4385,10 @@ dependencies = [
  "block",
  "byteorder",
  "bytes 1.5.0",
+ "cocoa",
  "collections",
  "core-foundation",
+ "core-graphics 0.22.3",
  "foreign-types 0.3.2",
  "futures 0.3.28",
  "gpui",
@@ -4227,6 +4398,7 @@ dependencies = [
  "log",
  "media",
  "nanoid",
+ "objc",
  "parking_lot 0.11.2",
  "postage",
  "serde",
@@ -4414,7 +4586,7 @@ dependencies = [
  "bytes 1.5.0",
  "core-foundation",
  "foreign-types 0.3.2",
- "metal",
+ "metal 0.21.0",
  "objc",
 ]
 
@@ -4482,6 +4654,21 @@ dependencies = [
  "objc",
 ]
 
+[[package]]
+name = "metal"
+version = "0.25.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "550b24b0cd4cf923f36bae78eca457b3a10d8a6a14a9c84cb2687b527e6a84af"
+dependencies = [
+ "bitflags 1.3.2",
+ "block",
+ "core-graphics-types",
+ "foreign-types 0.5.0",
+ "log",
+ "objc",
+ "paste",
+]
+
 [[package]]
 name = "mimalloc"
 version = "0.1.39"
@@ -4531,6 +4718,12 @@ dependencies = [
  "adler",
 ]
 
+[[package]]
+name = "mint"
+version = "0.5.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e53debba6bda7a793e5f99b8dacf19e626084f525f7829104ba9898f367d85ff"
+
 [[package]]
 name = "mintex"
 version = "0.1.2"
@@ -4658,6 +4851,26 @@ version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e5ce46fe64a9d73be07dcbe690a38ce1b293be448fd8ce1e6c1b8062c9f72c6a"
 
+[[package]]
+name = "naga"
+version = "0.14.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae585df4b6514cf8842ac0f1ab4992edc975892704835b549cf818dc0191249e"
+dependencies = [
+ "bit-set",
+ "bitflags 2.4.1",
+ "codespan-reporting",
+ "hexf-parse",
+ "indexmap 2.0.0",
+ "log",
+ "num-traits",
+ "rustc-hash",
+ "spirv",
+ "termcolor",
+ "thiserror",
+ "unicode-xid",
+]
+
 [[package]]
 name = "nanoid"
 version = "0.4.0"
@@ -4667,6 +4880,15 @@ dependencies = [
  "rand 0.8.5",
 ]
 
+[[package]]
+name = "nanorand"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a51313c5820b0b02bd422f4b44776fbf47961755c74ce64afc73bfad10226c3"
+dependencies = [
+ "getrandom 0.2.10",
+]
+
 [[package]]
 name = "native-tls"
 version = "0.2.11"
@@ -5600,9 +5822,9 @@ checksum = "26072860ba924cbfa98ea39c8c19b4dd6a4a25423dbdf219c1eca91aa0cf6964"
 
 [[package]]
 name = "plist"
-version = "1.5.0"
+version = "1.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bdc0001cfea3db57a2e24bc0d818e9e20e554b5f97fabb9bc231dc240269ae06"
+checksum = "9a4a0cfc5fb21a09dc6af4bf834cf10d4a32fccd9e2ea468c4b1751a097487aa"
 dependencies = [
  "base64 0.21.4",
  "indexmap 1.9.3",
@@ -6069,9 +6291,9 @@ dependencies = [
 
 [[package]]
 name = "quick-xml"
-version = "0.29.0"
+version = "0.30.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "81b9228215d82c7b61490fec1de287136b5de6f5700f6e58ea9ad61a7964ca51"
+checksum = "eff6510e86862b57b210fd8cbe8ed3f0d7d600b9c2863cd4549a2e033c66e956"
 dependencies = [
  "memchr",
 ]
@@ -6187,6 +6409,18 @@ version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "42a9830a0e1b9fb145ebb365b8bc4ccd75f290f98c0247deafbbe2c75cefb544"
 
+[[package]]
+name = "raw-window-metal"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac4ea493258d54c24cb46aa9345d099e58e2ea3f30dd63667fc54fc892f18e76"
+dependencies = [
+ "cocoa",
+ "core-graphics 0.23.1",
+ "objc",
+ "raw-window-handle 0.5.2",
+]
+
 [[package]]
 name = "rawpointer"
 version = "0.2.1"
@@ -7528,6 +7762,16 @@ dependencies = [
  "lock_api",
 ]
 
+[[package]]
+name = "spirv"
+version = "0.2.0+1.5.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "246bfa38fe3db3f1dfc8ca5a2cdeb7348c78be2112740cc0ec8ef18b6d94f830"
+dependencies = [
+ "bitflags 1.3.2",
+ "num-traits",
+]
+
 [[package]]
 name = "spki"
 version = "0.7.2"
@@ -9284,6 +9528,12 @@ version = "0.1.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e51733f11c9c4f72aa0c160008246859e340b00807569a0da0e7a1079b27ba85"
 
+[[package]]
+name = "unicode-xid"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f962df74c8c05a667b5ee8bcf162993134c104e96440b663c8daa176dc772d8c"
+
 [[package]]
 name = "unicode_categories"
 version = "0.1.1"
@@ -10284,6 +10534,18 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "xcb"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d27b37e69b8c05bfadcd968eb1a4fe27c9c52565b727f88512f43b89567e262"
+dependencies = [
+ "as-raw-xcb-connection",
+ "bitflags 1.3.2",
+ "libc",
+ "quick-xml",
+]
+
 [[package]]
 name = "xmlparser"
 version = "0.13.5"

Cargo.toml 🔗

@@ -277,6 +277,11 @@ wasmtime = { git = "https://github.com/bytecodealliance/wasmtime", rev = "v16.0.
 split-debuginfo = "unpacked"
 debug = "limited"
 
+# todo!(linux) - Remove this
+[profile.dev.package.blade-graphics]
+split-debuginfo = "off"
+debug = "full"
+
 [profile.dev.package.taffy]
 opt-level = 3
 

crates/fs/src/fs.rs 🔗

@@ -287,12 +287,17 @@ impl Fs for RealFs {
     ) -> Pin<Box<dyn Send + Stream<Item = Vec<Event>>>> {
         let (tx, rx) = smol::channel::unbounded();
 
+        if !path.exists() {
+            log::error!("watch path does not exist: {}", path.display());
+            return Box::pin(rx);
+        }
+
         let mut watcher = notify::recommended_watcher(move |res| match res {
             Ok(event) => {
                 let _ = tx.try_send(vec![event]);
             }
             Err(err) => {
-                eprintln!("watch error: {:?}", err);
+                log::error!("watch error: {}", err);
             }
         })
         .unwrap();

crates/gpui/Cargo.toml 🔗

@@ -33,6 +33,7 @@ dhat = { version = "0.3", optional = true }
 env_logger = { version = "0.9", optional = true }
 etagere = "0.2"
 futures.workspace = true
+font-kit = { git = "https://github.com/zed-industries/font-kit", rev = "d97147f" }
 gpui_macros.workspace = true
 image = "0.23"
 itertools = "0.10"
@@ -46,7 +47,8 @@ parking_lot.workspace = true
 pathfinder_geometry = "0.5"
 postage.workspace = true
 rand.workspace = true
-raw-window-handle = "0.6.0"
+raw-window-handle = "0.6"
+blade-rwh = { package = "raw-window-handle", version = "0.5" }
 refineable.workspace = true
 resvg = "0.14"
 schemars.workspace = true
@@ -86,9 +88,17 @@ cocoa = "0.25"
 core-foundation = { version = "0.9.3", features = ["with-uuid"] }
 core-graphics = "0.22.3"
 core-text = "19.2"
-font-kit = { git = "https://github.com/zed-industries/font-kit", rev = "d97147f" }
 foreign-types = "0.3"
 log.workspace = true
 media.workspace = true
 metal = "0.21.0"
 objc = "0.2"
+
+[target.'cfg(target_os = "linux")'.dependencies]
+flume = "0.11"
+xcb = { version = "1.3", features = ["as-raw-xcb-connection"] }
+as-raw-xcb-connection = "1"
+#TODO: use these on all platforms
+blade-graphics = { git = "https://github.com/kvark/blade", rev = "f35bc605154e210ab6190291235889b6ddad73f1" }
+blade-macros = { git = "https://github.com/kvark/blade", rev = "f35bc605154e210ab6190291235889b6ddad73f1" }
+bytemuck = "1"

crates/gpui/build.rs 🔗

@@ -1,3 +1,5 @@
+#![cfg_attr(not(target_os = "macos"), allow(unused))]
+
 use std::{
     env,
     path::{Path, PathBuf},
@@ -6,10 +8,14 @@ use std::{
 use cbindgen::Config;
 
 fn main() {
+    #[cfg(target_os = "macos")]
     generate_dispatch_bindings();
+    #[cfg(target_os = "macos")]
     let header_path = generate_shader_bindings();
+    #[cfg(target_os = "macos")]
     #[cfg(feature = "runtime_shaders")]
     emit_stitched_shaders(&header_path);
+    #[cfg(target_os = "macos")]
     #[cfg(not(feature = "runtime_shaders"))]
     compile_metal_shaders(&header_path);
 }

crates/gpui/examples/hello_world.rs 🔗

@@ -9,9 +9,12 @@ impl Render for HelloWorld {
         div()
             .flex()
             .bg(rgb(0x2e7d32))
-            .size_full()
+            .size(Length::Definite(Pixels(300.0).into()))
             .justify_center()
             .items_center()
+            .shadow_lg()
+            .border()
+            .border_color(rgb(0x0000ff))
             .text_xl()
             .text_color(rgb(0xffffff))
             .child(format!("Hello, {}!", &self.text))

crates/gpui/src/elements/img.rs 🔗

@@ -7,6 +7,7 @@ use crate::{
     StyleRefinement, Styled, UriOrPath,
 };
 use futures::FutureExt;
+#[cfg(target_os = "macos")]
 use media::core_video::CVImageBuffer;
 use util::ResultExt;
 
@@ -21,6 +22,7 @@ pub enum ImageSource {
     Data(Arc<ImageData>),
     // TODO: move surface definitions into mac platform module
     /// A CoreVideo image buffer
+    #[cfg(target_os = "macos")]
     Surface(CVImageBuffer),
 }
 
@@ -54,6 +56,7 @@ impl From<Arc<ImageData>> for ImageSource {
     }
 }
 
+#[cfg(target_os = "macos")]
 impl From<CVImageBuffer> for ImageSource {
     fn from(value: CVImageBuffer) -> Self {
         Self::Surface(value)
@@ -144,6 +147,7 @@ impl Element for Img {
                                 .log_err();
                         }
 
+                        #[cfg(target_os = "macos")]
                         ImageSource::Surface(surface) => {
                             let size = size(surface.width().into(), surface.height().into());
                             let new_bounds = preserve_aspect_ratio(bounds, size);

crates/gpui/src/gpui.rs 🔗

@@ -6,8 +6,7 @@
 //! ## Getting Started
 //!
 //! GPUI is still in active development as we work on the Zed code editor and isn't yet on crates.io.
-//! You'll also need to use the latest version of stable rust and be on macOS. Add the following to your
-//! Cargo.toml:
+//! You'll also need to use the latest version of stable rust. Add the following to your Cargo.toml:
 //!
 //! ```
 //! gpui = { git = "https://github.com/zed-industries/zed" }

crates/gpui/src/platform.rs 🔗

@@ -1,5 +1,7 @@
 mod app_menu;
 mod keystroke;
+#[cfg(target_os = "linux")]
+mod linux;
 #[cfg(target_os = "macos")]
 mod mac;
 #[cfg(any(test, feature = "test-support"))]
@@ -33,6 +35,8 @@ use uuid::Uuid;
 
 pub use app_menu::*;
 pub use keystroke::*;
+#[cfg(target_os = "linux")]
+pub(crate) use linux::*;
 #[cfg(target_os = "macos")]
 pub(crate) use mac::*;
 #[cfg(any(test, feature = "test-support"))]
@@ -44,6 +48,10 @@ pub use util::SemanticVersion;
 pub(crate) fn current_platform() -> Rc<dyn Platform> {
     Rc::new(MacPlatform::new())
 }
+#[cfg(target_os = "linux")]
+pub(crate) fn current_platform() -> Rc<dyn Platform> {
+    Rc::new(LinuxPlatform::new())
+}
 
 pub(crate) trait Platform: 'static {
     fn background_executor(&self) -> BackgroundExecutor;
@@ -298,6 +306,7 @@ pub(crate) trait PlatformAtlas: Send + Sync {
 pub(crate) struct AtlasTile {
     pub(crate) texture_id: AtlasTextureId,
     pub(crate) tile_id: TileId,
+    pub(crate) padding: u32,
     pub(crate) bounds: Bounds<DevicePixels>,
 }
 

crates/gpui/src/platform/linux.rs 🔗

@@ -0,0 +1,18 @@
+mod blade_atlas;
+mod blade_belt;
+mod blade_renderer;
+mod dispatcher;
+mod display;
+mod platform;
+mod text_system;
+mod window;
+
+pub(crate) use blade_atlas::*;
+pub(crate) use dispatcher::*;
+pub(crate) use display::*;
+pub(crate) use platform::*;
+pub(crate) use text_system::*;
+pub(crate) use window::*;
+
+use blade_belt::*;
+use blade_renderer::*;

crates/gpui/src/platform/linux/blade_atlas.rs 🔗

@@ -0,0 +1,361 @@
+use super::{BladeBelt, BladeBeltDescriptor};
+use crate::{
+    AtlasKey, AtlasTextureId, AtlasTextureKind, AtlasTile, Bounds, DevicePixels, PlatformAtlas,
+    Point, Size,
+};
+use anyhow::Result;
+use blade_graphics as gpu;
+use collections::FxHashMap;
+use etagere::BucketedAtlasAllocator;
+use parking_lot::Mutex;
+use std::{borrow::Cow, ops, sync::Arc};
+
+pub(crate) const PATH_TEXTURE_FORMAT: gpu::TextureFormat = gpu::TextureFormat::R16Float;
+
+pub(crate) struct BladeAtlas(Mutex<BladeAtlasState>);
+
+struct PendingUpload {
+    id: AtlasTextureId,
+    bounds: Bounds<DevicePixels>,
+    data: gpu::BufferPiece,
+}
+
+struct BladeAtlasState {
+    gpu: Arc<gpu::Context>,
+    upload_belt: BladeBelt,
+    storage: BladeAtlasStorage,
+    tiles_by_key: FxHashMap<AtlasKey, AtlasTile>,
+    initializations: Vec<AtlasTextureId>,
+    uploads: Vec<PendingUpload>,
+}
+
+impl BladeAtlasState {
+    fn destroy(&mut self) {
+        self.storage.destroy(&self.gpu);
+        self.upload_belt.destroy(&self.gpu);
+    }
+}
+
+pub struct BladeTextureInfo {
+    pub size: gpu::Extent,
+    pub raw_view: gpu::TextureView,
+}
+
+impl BladeAtlas {
+    pub(crate) fn new(gpu: &Arc<gpu::Context>) -> Self {
+        BladeAtlas(Mutex::new(BladeAtlasState {
+            gpu: Arc::clone(gpu),
+            upload_belt: BladeBelt::new(BladeBeltDescriptor {
+                memory: gpu::Memory::Upload,
+                min_chunk_size: 0x10000,
+                alignment: 64, // Vulkan `optimalBufferCopyOffsetAlignment` on Intel XE
+            }),
+            storage: BladeAtlasStorage::default(),
+            tiles_by_key: Default::default(),
+            initializations: Vec::new(),
+            uploads: Vec::new(),
+        }))
+    }
+
+    pub(crate) fn destroy(&self) {
+        self.0.lock().destroy();
+    }
+
+    pub(crate) fn clear_textures(&self, texture_kind: AtlasTextureKind) {
+        let mut lock = self.0.lock();
+        let textures = &mut lock.storage[texture_kind];
+        for texture in textures {
+            texture.clear();
+        }
+    }
+
+    pub fn allocate(&self, size: Size<DevicePixels>, texture_kind: AtlasTextureKind) -> AtlasTile {
+        let mut lock = self.0.lock();
+        lock.allocate(size, texture_kind)
+    }
+
+    pub fn before_frame(&self, gpu_encoder: &mut gpu::CommandEncoder) {
+        let mut lock = self.0.lock();
+        lock.flush(gpu_encoder);
+    }
+
+    pub fn after_frame(&self, sync_point: &gpu::SyncPoint) {
+        let mut lock = self.0.lock();
+        lock.upload_belt.flush(sync_point);
+    }
+
+    pub fn get_texture_info(&self, id: AtlasTextureId) -> BladeTextureInfo {
+        let lock = self.0.lock();
+        let texture = &lock.storage[id];
+        let size = texture.allocator.size();
+        BladeTextureInfo {
+            size: gpu::Extent {
+                width: size.width as u32,
+                height: size.height as u32,
+                depth: 1,
+            },
+            raw_view: texture.raw_view,
+        }
+    }
+}
+
+impl PlatformAtlas for BladeAtlas {
+    fn get_or_insert_with<'a>(
+        &self,
+        key: &AtlasKey,
+        build: &mut dyn FnMut() -> Result<(Size<DevicePixels>, Cow<'a, [u8]>)>,
+    ) -> Result<AtlasTile> {
+        let mut lock = self.0.lock();
+        if let Some(tile) = lock.tiles_by_key.get(key) {
+            Ok(tile.clone())
+        } else {
+            let (size, bytes) = build()?;
+            let tile = lock.allocate(size, key.texture_kind());
+            lock.upload_texture(tile.texture_id, tile.bounds, &bytes);
+            lock.tiles_by_key.insert(key.clone(), tile.clone());
+            Ok(tile)
+        }
+    }
+}
+
+impl BladeAtlasState {
+    fn allocate(&mut self, size: Size<DevicePixels>, texture_kind: AtlasTextureKind) -> AtlasTile {
+        let textures = &mut self.storage[texture_kind];
+        textures
+            .iter_mut()
+            .rev()
+            .find_map(|texture| texture.allocate(size))
+            .unwrap_or_else(|| {
+                let texture = self.push_texture(size, texture_kind);
+                texture.allocate(size).unwrap()
+            })
+    }
+
+    fn push_texture(
+        &mut self,
+        min_size: Size<DevicePixels>,
+        kind: AtlasTextureKind,
+    ) -> &mut BladeAtlasTexture {
+        const DEFAULT_ATLAS_SIZE: Size<DevicePixels> = Size {
+            width: DevicePixels(1024),
+            height: DevicePixels(1024),
+        };
+
+        let size = min_size.max(&DEFAULT_ATLAS_SIZE);
+        let format;
+        let usage;
+        match kind {
+            AtlasTextureKind::Monochrome => {
+                format = gpu::TextureFormat::R8Unorm;
+                usage = gpu::TextureUsage::COPY | gpu::TextureUsage::RESOURCE;
+            }
+            AtlasTextureKind::Polychrome => {
+                format = gpu::TextureFormat::Bgra8Unorm;
+                usage = gpu::TextureUsage::COPY | gpu::TextureUsage::RESOURCE;
+            }
+            AtlasTextureKind::Path => {
+                format = PATH_TEXTURE_FORMAT;
+                usage = gpu::TextureUsage::COPY
+                    | gpu::TextureUsage::RESOURCE
+                    | gpu::TextureUsage::TARGET;
+            }
+        }
+
+        let raw = self.gpu.create_texture(gpu::TextureDesc {
+            name: "atlas",
+            format,
+            size: gpu::Extent {
+                width: size.width.into(),
+                height: size.height.into(),
+                depth: 1,
+            },
+            array_layer_count: 1,
+            mip_level_count: 1,
+            dimension: gpu::TextureDimension::D2,
+            usage,
+        });
+        let raw_view = self.gpu.create_texture_view(gpu::TextureViewDesc {
+            name: "",
+            texture: raw,
+            format,
+            dimension: gpu::ViewDimension::D2,
+            subresources: &Default::default(),
+        });
+
+        let textures = &mut self.storage[kind];
+        let atlas_texture = BladeAtlasTexture {
+            id: AtlasTextureId {
+                index: textures.len() as u32,
+                kind,
+            },
+            allocator: etagere::BucketedAtlasAllocator::new(size.into()),
+            format,
+            raw,
+            raw_view,
+        };
+
+        self.initializations.push(atlas_texture.id);
+        textures.push(atlas_texture);
+        textures.last_mut().unwrap()
+    }
+
+    fn upload_texture(&mut self, id: AtlasTextureId, bounds: Bounds<DevicePixels>, bytes: &[u8]) {
+        let data = self.upload_belt.alloc_data(bytes, &self.gpu);
+        self.uploads.push(PendingUpload { id, bounds, data });
+    }
+
+    fn flush(&mut self, encoder: &mut gpu::CommandEncoder) {
+        for id in self.initializations.drain(..) {
+            let texture = &self.storage[id];
+            encoder.init_texture(texture.raw);
+        }
+
+        let mut transfers = encoder.transfer();
+        for upload in self.uploads.drain(..) {
+            let texture = &self.storage[upload.id];
+            transfers.copy_buffer_to_texture(
+                upload.data,
+                upload.bounds.size.width.to_bytes(texture.bytes_per_pixel()),
+                gpu::TexturePiece {
+                    texture: texture.raw,
+                    mip_level: 0,
+                    array_layer: 0,
+                    origin: [
+                        upload.bounds.origin.x.into(),
+                        upload.bounds.origin.y.into(),
+                        0,
+                    ],
+                },
+                gpu::Extent {
+                    width: upload.bounds.size.width.into(),
+                    height: upload.bounds.size.height.into(),
+                    depth: 1,
+                },
+            );
+        }
+    }
+}
+
+#[derive(Default)]
+struct BladeAtlasStorage {
+    monochrome_textures: Vec<BladeAtlasTexture>,
+    polychrome_textures: Vec<BladeAtlasTexture>,
+    path_textures: Vec<BladeAtlasTexture>,
+}
+
+impl ops::Index<AtlasTextureKind> for BladeAtlasStorage {
+    type Output = Vec<BladeAtlasTexture>;
+    fn index(&self, kind: AtlasTextureKind) -> &Self::Output {
+        match kind {
+            crate::AtlasTextureKind::Monochrome => &self.monochrome_textures,
+            crate::AtlasTextureKind::Polychrome => &self.polychrome_textures,
+            crate::AtlasTextureKind::Path => &self.path_textures,
+        }
+    }
+}
+
+impl ops::IndexMut<AtlasTextureKind> for BladeAtlasStorage {
+    fn index_mut(&mut self, kind: AtlasTextureKind) -> &mut Self::Output {
+        match kind {
+            crate::AtlasTextureKind::Monochrome => &mut self.monochrome_textures,
+            crate::AtlasTextureKind::Polychrome => &mut self.polychrome_textures,
+            crate::AtlasTextureKind::Path => &mut self.path_textures,
+        }
+    }
+}
+
+impl ops::Index<AtlasTextureId> for BladeAtlasStorage {
+    type Output = BladeAtlasTexture;
+    fn index(&self, id: AtlasTextureId) -> &Self::Output {
+        let textures = match id.kind {
+            crate::AtlasTextureKind::Monochrome => &self.monochrome_textures,
+            crate::AtlasTextureKind::Polychrome => &self.polychrome_textures,
+            crate::AtlasTextureKind::Path => &self.path_textures,
+        };
+        &textures[id.index as usize]
+    }
+}
+
+impl BladeAtlasStorage {
+    fn destroy(&mut self, gpu: &gpu::Context) {
+        for mut texture in self.monochrome_textures.drain(..) {
+            texture.destroy(gpu);
+        }
+        for mut texture in self.polychrome_textures.drain(..) {
+            texture.destroy(gpu);
+        }
+        for mut texture in self.path_textures.drain(..) {
+            texture.destroy(gpu);
+        }
+    }
+}
+
+struct BladeAtlasTexture {
+    id: AtlasTextureId,
+    allocator: BucketedAtlasAllocator,
+    raw: gpu::Texture,
+    raw_view: gpu::TextureView,
+    format: gpu::TextureFormat,
+}
+
+impl BladeAtlasTexture {
+    fn clear(&mut self) {
+        self.allocator.clear();
+    }
+
+    fn allocate(&mut self, size: Size<DevicePixels>) -> Option<AtlasTile> {
+        let allocation = self.allocator.allocate(size.into())?;
+        let tile = AtlasTile {
+            texture_id: self.id,
+            tile_id: allocation.id.into(),
+            padding: 0,
+            bounds: Bounds {
+                origin: allocation.rectangle.min.into(),
+                size,
+            },
+        };
+        Some(tile)
+    }
+
+    fn destroy(&mut self, gpu: &gpu::Context) {
+        gpu.destroy_texture(self.raw);
+        gpu.destroy_texture_view(self.raw_view);
+    }
+
+    fn bytes_per_pixel(&self) -> u8 {
+        self.format.block_info().size
+    }
+}
+
+impl From<Size<DevicePixels>> for etagere::Size {
+    fn from(size: Size<DevicePixels>) -> Self {
+        etagere::Size::new(size.width.into(), size.height.into())
+    }
+}
+
+impl From<etagere::Point> for Point<DevicePixels> {
+    fn from(value: etagere::Point) -> Self {
+        Point {
+            x: DevicePixels::from(value.x),
+            y: DevicePixels::from(value.y),
+        }
+    }
+}
+
+impl From<etagere::Size> for Size<DevicePixels> {
+    fn from(size: etagere::Size) -> Self {
+        Size {
+            width: DevicePixels::from(size.width),
+            height: DevicePixels::from(size.height),
+        }
+    }
+}
+
+impl From<etagere::Rectangle> for Bounds<DevicePixels> {
+    fn from(rectangle: etagere::Rectangle) -> Self {
+        Bounds {
+            origin: rectangle.min.into(),
+            size: rectangle.size().into(),
+        }
+    }
+}

crates/gpui/src/platform/linux/blade_belt.rs 🔗

@@ -0,0 +1,100 @@
+use blade_graphics as gpu;
+use std::mem;
+
+struct ReusableBuffer {
+    raw: gpu::Buffer,
+    size: u64,
+}
+
+pub struct BladeBeltDescriptor {
+    pub memory: gpu::Memory,
+    pub min_chunk_size: u64,
+    pub alignment: u64,
+}
+
+/// A belt of buffers, used by the BladeAtlas to cheaply
+/// find staging space for uploads.
+pub struct BladeBelt {
+    desc: BladeBeltDescriptor,
+    buffers: Vec<(ReusableBuffer, gpu::SyncPoint)>,
+    active: Vec<(ReusableBuffer, u64)>,
+}
+
+impl BladeBelt {
+    pub fn new(desc: BladeBeltDescriptor) -> Self {
+        assert_ne!(desc.alignment, 0);
+        Self {
+            desc,
+            buffers: Vec::new(),
+            active: Vec::new(),
+        }
+    }
+
+    pub fn destroy(&mut self, gpu: &gpu::Context) {
+        for (buffer, _) in self.buffers.drain(..) {
+            gpu.destroy_buffer(buffer.raw);
+        }
+        for (buffer, _) in self.active.drain(..) {
+            gpu.destroy_buffer(buffer.raw);
+        }
+    }
+
+    pub fn alloc(&mut self, size: u64, gpu: &gpu::Context) -> gpu::BufferPiece {
+        for &mut (ref rb, ref mut offset) in self.active.iter_mut() {
+            let aligned = offset.next_multiple_of(self.desc.alignment);
+            if aligned + size <= rb.size {
+                let piece = rb.raw.at(aligned);
+                *offset = aligned + size;
+                return piece;
+            }
+        }
+
+        let index_maybe = self
+            .buffers
+            .iter()
+            .position(|&(ref rb, ref sp)| size <= rb.size && gpu.wait_for(sp, 0));
+        if let Some(index) = index_maybe {
+            let (rb, _) = self.buffers.remove(index);
+            let piece = rb.raw.into();
+            self.active.push((rb, size));
+            return piece;
+        }
+
+        let chunk_index = self.buffers.len() + self.active.len();
+        let chunk_size = size.max(self.desc.min_chunk_size);
+        let chunk = gpu.create_buffer(gpu::BufferDesc {
+            name: &format!("chunk-{}", chunk_index),
+            size: chunk_size,
+            memory: self.desc.memory,
+        });
+        let rb = ReusableBuffer {
+            raw: chunk,
+            size: chunk_size,
+        };
+        self.active.push((rb, size));
+        chunk.into()
+    }
+
+    //todo!(linux): enforce T: bytemuck::Zeroable
+    pub fn alloc_data<T>(&mut self, data: &[T], gpu: &gpu::Context) -> gpu::BufferPiece {
+        assert!(!data.is_empty());
+        let type_alignment = mem::align_of::<T>() as u64;
+        debug_assert_eq!(
+            self.desc.alignment % type_alignment,
+            0,
+            "Type alignment {} is too big",
+            type_alignment
+        );
+        let total_bytes = data.len() * mem::size_of::<T>();
+        let bp = self.alloc(total_bytes as u64, gpu);
+        unsafe {
+            std::ptr::copy_nonoverlapping(data.as_ptr() as *const u8, bp.data(), total_bytes);
+        }
+        bp
+    }
+
+    pub fn flush(&mut self, sp: &gpu::SyncPoint) {
+        self.buffers
+            .extend(self.active.drain(..).map(|(rb, _)| (rb, sp.clone())));
+    }
+}

crates/gpui/src/platform/linux/blade_renderer.rs 🔗

@@ -0,0 +1,506 @@
+// Doing `if let` gives you nice scoping with passes/encoders
+#![allow(irrefutable_let_patterns)]
+
+use super::{BladeBelt, BladeBeltDescriptor};
+use crate::{
+    AtlasTextureKind, AtlasTile, BladeAtlas, Bounds, ContentMask, Hsla, MonochromeSprite, Path,
+    PathId, PathVertex, PolychromeSprite, PrimitiveBatch, Quad, ScaledPixels, Scene, Shadow,
+    Underline, PATH_TEXTURE_FORMAT,
+};
+use bytemuck::{Pod, Zeroable};
+use collections::HashMap;
+
+use blade_graphics as gpu;
+use std::{mem, sync::Arc};
+
+const SURFACE_FRAME_COUNT: u32 = 3;
+const MAX_FRAME_TIME_MS: u32 = 1000;
+
+#[repr(C)]
+#[derive(Clone, Copy, Pod, Zeroable)]
+struct GlobalParams {
+    viewport_size: [f32; 2],
+    pad: [u32; 2],
+}
+
+#[derive(blade_macros::ShaderData)]
+struct ShaderQuadsData {
+    globals: GlobalParams,
+    b_quads: gpu::BufferPiece,
+}
+
+#[derive(blade_macros::ShaderData)]
+struct ShaderShadowsData {
+    globals: GlobalParams,
+    b_shadows: gpu::BufferPiece,
+}
+
+#[derive(blade_macros::ShaderData)]
+struct ShaderPathRasterizationData {
+    globals: GlobalParams,
+    b_path_vertices: gpu::BufferPiece,
+}
+
+#[derive(blade_macros::ShaderData)]
+struct ShaderPathsData {
+    globals: GlobalParams,
+    t_sprite: gpu::TextureView,
+    s_sprite: gpu::Sampler,
+    b_path_sprites: gpu::BufferPiece,
+}
+
+#[derive(blade_macros::ShaderData)]
+struct ShaderUnderlinesData {
+    globals: GlobalParams,
+    b_underlines: gpu::BufferPiece,
+}
+
+#[derive(blade_macros::ShaderData)]
+struct ShaderMonoSpritesData {
+    globals: GlobalParams,
+    t_sprite: gpu::TextureView,
+    s_sprite: gpu::Sampler,
+    b_mono_sprites: gpu::BufferPiece,
+}
+
+#[derive(blade_macros::ShaderData)]
+struct ShaderPolySpritesData {
+    globals: GlobalParams,
+    t_sprite: gpu::TextureView,
+    s_sprite: gpu::Sampler,
+    b_poly_sprites: gpu::BufferPiece,
+}
+
+#[derive(Clone, Debug, Eq, PartialEq)]
+#[repr(C)]
+struct PathSprite {
+    bounds: Bounds<ScaledPixels>,
+    color: Hsla,
+    tile: AtlasTile,
+}
+
+struct BladePipelines {
+    quads: gpu::RenderPipeline,
+    shadows: gpu::RenderPipeline,
+    path_rasterization: gpu::RenderPipeline,
+    paths: gpu::RenderPipeline,
+    underlines: gpu::RenderPipeline,
+    mono_sprites: gpu::RenderPipeline,
+    poly_sprites: gpu::RenderPipeline,
+}
+
+impl BladePipelines {
+    fn new(gpu: &gpu::Context, surface_format: gpu::TextureFormat) -> Self {
+        use gpu::ShaderData as _;
+
+        let shader = gpu.create_shader(gpu::ShaderDesc {
+            source: include_str!("shaders.wgsl"),
+        });
+        shader.check_struct_size::<Quad>();
+        shader.check_struct_size::<Shadow>();
+        assert_eq!(
+            mem::size_of::<PathVertex<ScaledPixels>>(),
+            shader.get_struct_size("PathVertex") as usize,
+        );
+        shader.check_struct_size::<PathSprite>();
+        shader.check_struct_size::<Underline>();
+        shader.check_struct_size::<MonochromeSprite>();
+        shader.check_struct_size::<PolychromeSprite>();
+
+        Self {
+            quads: gpu.create_render_pipeline(gpu::RenderPipelineDesc {
+                name: "quads",
+                data_layouts: &[&ShaderQuadsData::layout()],
+                vertex: shader.at("vs_quad"),
+                primitive: gpu::PrimitiveState {
+                    topology: gpu::PrimitiveTopology::TriangleStrip,
+                    ..Default::default()
+                },
+                depth_stencil: None,
+                fragment: shader.at("fs_quad"),
+                color_targets: &[gpu::ColorTargetState {
+                    format: surface_format,
+                    blend: Some(gpu::BlendState::ALPHA_BLENDING),
+                    write_mask: gpu::ColorWrites::default(),
+                }],
+            }),
+            shadows: gpu.create_render_pipeline(gpu::RenderPipelineDesc {
+                name: "shadows",
+                data_layouts: &[&ShaderShadowsData::layout()],
+                vertex: shader.at("vs_shadow"),
+                primitive: gpu::PrimitiveState {
+                    topology: gpu::PrimitiveTopology::TriangleStrip,
+                    ..Default::default()
+                },
+                depth_stencil: None,
+                fragment: shader.at("fs_shadow"),
+                color_targets: &[gpu::ColorTargetState {
+                    format: surface_format,
+                    blend: Some(gpu::BlendState::ALPHA_BLENDING),
+                    write_mask: gpu::ColorWrites::default(),
+                }],
+            }),
+            path_rasterization: gpu.create_render_pipeline(gpu::RenderPipelineDesc {
+                name: "path_rasterization",
+                data_layouts: &[&ShaderPathRasterizationData::layout()],
+                vertex: shader.at("vs_path_rasterization"),
+                primitive: gpu::PrimitiveState {
+                    topology: gpu::PrimitiveTopology::TriangleStrip,
+                    ..Default::default()
+                },
+                depth_stencil: None,
+                fragment: shader.at("fs_path_rasterization"),
+                color_targets: &[gpu::ColorTargetState {
+                    format: PATH_TEXTURE_FORMAT,
+                    blend: Some(gpu::BlendState::ALPHA_BLENDING),
+                    write_mask: gpu::ColorWrites::default(),
+                }],
+            }),
+            paths: gpu.create_render_pipeline(gpu::RenderPipelineDesc {
+                name: "paths",
+                data_layouts: &[&ShaderPathsData::layout()],
+                vertex: shader.at("vs_path"),
+                primitive: gpu::PrimitiveState {
+                    topology: gpu::PrimitiveTopology::TriangleStrip,
+                    ..Default::default()
+                },
+                depth_stencil: None,
+                fragment: shader.at("fs_path"),
+                color_targets: &[gpu::ColorTargetState {
+                    format: surface_format,
+                    blend: Some(gpu::BlendState::ALPHA_BLENDING),
+                    write_mask: gpu::ColorWrites::default(),
+                }],
+            }),
+            underlines: gpu.create_render_pipeline(gpu::RenderPipelineDesc {
+                name: "underlines",
+                data_layouts: &[&ShaderUnderlinesData::layout()],
+                vertex: shader.at("vs_underline"),
+                primitive: gpu::PrimitiveState {
+                    topology: gpu::PrimitiveTopology::TriangleStrip,
+                    ..Default::default()
+                },
+                depth_stencil: None,
+                fragment: shader.at("fs_underline"),
+                color_targets: &[gpu::ColorTargetState {
+                    format: surface_format,
+                    blend: Some(gpu::BlendState::ALPHA_BLENDING),
+                    write_mask: gpu::ColorWrites::default(),
+                }],
+            }),
+            mono_sprites: gpu.create_render_pipeline(gpu::RenderPipelineDesc {
+                name: "mono-sprites",
+                data_layouts: &[&ShaderMonoSpritesData::layout()],
+                vertex: shader.at("vs_mono_sprite"),
+                primitive: gpu::PrimitiveState {
+                    topology: gpu::PrimitiveTopology::TriangleStrip,
+                    ..Default::default()
+                },
+                depth_stencil: None,
+                fragment: shader.at("fs_mono_sprite"),
+                color_targets: &[gpu::ColorTargetState {
+                    format: surface_format,
+                    blend: Some(gpu::BlendState::ALPHA_BLENDING),
+                    write_mask: gpu::ColorWrites::default(),
+                }],
+            }),
+            poly_sprites: gpu.create_render_pipeline(gpu::RenderPipelineDesc {
+                name: "poly-sprites",
+                data_layouts: &[&ShaderPolySpritesData::layout()],
+                vertex: shader.at("vs_poly_sprite"),
+                primitive: gpu::PrimitiveState {
+                    topology: gpu::PrimitiveTopology::TriangleStrip,
+                    ..Default::default()
+                },
+                depth_stencil: None,
+                fragment: shader.at("fs_poly_sprite"),
+                color_targets: &[gpu::ColorTargetState {
+                    format: surface_format,
+                    blend: Some(gpu::BlendState::ALPHA_BLENDING),
+                    write_mask: gpu::ColorWrites::default(),
+                }],
+            }),
+        }
+    }
+}
+
+pub struct BladeRenderer {
+    gpu: Arc<gpu::Context>,
+    command_encoder: gpu::CommandEncoder,
+    last_sync_point: Option<gpu::SyncPoint>,
+    pipelines: BladePipelines,
+    instance_belt: BladeBelt,
+    viewport_size: gpu::Extent,
+    path_tiles: HashMap<PathId, AtlasTile>,
+    atlas: Arc<BladeAtlas>,
+    atlas_sampler: gpu::Sampler,
+}
+
+impl BladeRenderer {
+    pub fn new(gpu: Arc<gpu::Context>, size: gpu::Extent) -> Self {
+        let surface_format = gpu.resize(gpu::SurfaceConfig {
+            size,
+            usage: gpu::TextureUsage::TARGET,
+            frame_count: SURFACE_FRAME_COUNT,
+        });
+        let command_encoder = gpu.create_command_encoder(gpu::CommandEncoderDesc {
+            name: "main",
+            buffer_count: 2,
+        });
+        let pipelines = BladePipelines::new(&gpu, surface_format);
+        let instance_belt = BladeBelt::new(BladeBeltDescriptor {
+            memory: gpu::Memory::Shared,
+            min_chunk_size: 0x1000,
+            alignment: 0x40, // Vulkan `minStorageBufferOffsetAlignment` on Intel Xe
+        });
+        let atlas = Arc::new(BladeAtlas::new(&gpu));
+        let atlas_sampler = gpu.create_sampler(gpu::SamplerDesc {
+            name: "atlas",
+            mag_filter: gpu::FilterMode::Linear,
+            min_filter: gpu::FilterMode::Linear,
+            ..Default::default()
+        });
+
+        Self {
+            gpu,
+            command_encoder,
+            last_sync_point: None,
+            pipelines,
+            instance_belt,
+            viewport_size: size,
+            path_tiles: HashMap::default(),
+            atlas,
+            atlas_sampler,
+        }
+    }
+
+    fn wait_for_gpu(&mut self) {
+        if let Some(last_sp) = self.last_sync_point.take() {
+            if !self.gpu.wait_for(&last_sp, MAX_FRAME_TIME_MS) {
+                panic!("GPU hung");
+            }
+        }
+    }
+
+    pub fn destroy(&mut self) {
+        self.wait_for_gpu();
+        self.atlas.destroy();
+        self.instance_belt.destroy(&self.gpu);
+        self.gpu.destroy_command_encoder(&mut self.command_encoder);
+    }
+
+    pub fn resize(&mut self, size: gpu::Extent) {
+        self.wait_for_gpu();
+        self.gpu.resize(gpu::SurfaceConfig {
+            size,
+            usage: gpu::TextureUsage::TARGET,
+            frame_count: SURFACE_FRAME_COUNT,
+        });
+        self.viewport_size = size;
+    }
+
+    pub fn viewport_size(&self) -> gpu::Extent {
+        self.viewport_size
+    }
+
+    pub fn atlas(&self) -> &Arc<BladeAtlas> {
+        &self.atlas
+    }
+
+    fn rasterize_paths(&mut self, paths: &[Path<ScaledPixels>]) {
+        self.path_tiles.clear();
+        let mut vertices_by_texture_id = HashMap::default();
+
+        for path in paths {
+            let clipped_bounds = path.bounds.intersect(&path.content_mask.bounds);
+            let tile = self
+                .atlas
+                .allocate(clipped_bounds.size.map(Into::into), AtlasTextureKind::Path);
+            vertices_by_texture_id
+                .entry(tile.texture_id)
+                .or_insert(Vec::new())
+                .extend(path.vertices.iter().map(|vertex| PathVertex {
+                    xy_position: vertex.xy_position - clipped_bounds.origin
+                        + tile.bounds.origin.map(Into::into),
+                    st_position: vertex.st_position,
+                    content_mask: ContentMask {
+                        bounds: tile.bounds.map(Into::into),
+                    },
+                }));
+            self.path_tiles.insert(path.id, tile);
+        }
+
+        for (texture_id, vertices) in vertices_by_texture_id {
+            let tex_info = self.atlas.get_texture_info(texture_id);
+            let globals = GlobalParams {
+                viewport_size: [tex_info.size.width as f32, tex_info.size.height as f32],
+                pad: [0; 2],
+            };
+
+            let vertex_buf = self.instance_belt.alloc_data(&vertices, &self.gpu);
+            let mut pass = self.command_encoder.render(gpu::RenderTargetSet {
+                colors: &[gpu::RenderTarget {
+                    view: tex_info.raw_view,
+                    init_op: gpu::InitOp::Clear(gpu::TextureColor::OpaqueBlack),
+                    finish_op: gpu::FinishOp::Store,
+                }],
+                depth_stencil: None,
+            });
+
+            let mut encoder = pass.with(&self.pipelines.path_rasterization);
+            encoder.bind(
+                0,
+                &ShaderPathRasterizationData {
+                    globals,
+                    b_path_vertices: vertex_buf,
+                },
+            );
+            encoder.draw(0, vertices.len() as u32, 0, 1);
+        }
+    }
+
+    pub fn draw(&mut self, scene: &Scene) {
+        let frame = self.gpu.acquire_frame();
+        self.command_encoder.start();
+        self.command_encoder.init_texture(frame.texture());
+
+        self.atlas.before_frame(&mut self.command_encoder);
+        self.rasterize_paths(scene.paths());
+
+        let globals = GlobalParams {
+            viewport_size: [
+                self.viewport_size.width as f32,
+                self.viewport_size.height as f32,
+            ],
+            pad: [0; 2],
+        };
+
+        if let mut pass = self.command_encoder.render(gpu::RenderTargetSet {
+            colors: &[gpu::RenderTarget {
+                view: frame.texture_view(),
+                init_op: gpu::InitOp::Clear(gpu::TextureColor::TransparentBlack),
+                finish_op: gpu::FinishOp::Store,
+            }],
+            depth_stencil: None,
+        }) {
+            for batch in scene.batches() {
+                match batch {
+                    PrimitiveBatch::Quads(quads) => {
+                        let instance_buf = self.instance_belt.alloc_data(quads, &self.gpu);
+                        let mut encoder = pass.with(&self.pipelines.quads);
+                        encoder.bind(
+                            0,
+                            &ShaderQuadsData {
+                                globals,
+                                b_quads: instance_buf,
+                            },
+                        );
+                        encoder.draw(0, 4, 0, quads.len() as u32);
+                    }
+                    PrimitiveBatch::Shadows(shadows) => {
+                        let instance_buf = self.instance_belt.alloc_data(shadows, &self.gpu);
+                        let mut encoder = pass.with(&self.pipelines.shadows);
+                        encoder.bind(
+                            0,
+                            &ShaderShadowsData {
+                                globals,
+                                b_shadows: instance_buf,
+                            },
+                        );
+                        encoder.draw(0, 4, 0, shadows.len() as u32);
+                    }
+                    PrimitiveBatch::Paths(paths) => {
+                        let mut encoder = pass.with(&self.pipelines.paths);
+                        //todo!(linux): group by texture ID
+                        for path in paths {
+                            let tile = &self.path_tiles[&path.id];
+                            let tex_info = self.atlas.get_texture_info(tile.texture_id);
+                            let origin = path.bounds.intersect(&path.content_mask.bounds).origin;
+                            let sprites = [PathSprite {
+                                bounds: Bounds {
+                                    origin: origin.map(|p| p.floor()),
+                                    size: tile.bounds.size.map(Into::into),
+                                },
+                                color: path.color,
+                                tile: (*tile).clone(),
+                            }];
+
+                            let instance_buf = self.instance_belt.alloc_data(&sprites, &self.gpu);
+                            encoder.bind(
+                                0,
+                                &ShaderPathsData {
+                                    globals,
+                                    t_sprite: tex_info.raw_view,
+                                    s_sprite: self.atlas_sampler,
+                                    b_path_sprites: instance_buf,
+                                },
+                            );
+                            encoder.draw(0, 4, 0, sprites.len() as u32);
+                        }
+                    }
+                    PrimitiveBatch::Underlines(underlines) => {
+                        let instance_buf = self.instance_belt.alloc_data(underlines, &self.gpu);
+                        let mut encoder = pass.with(&self.pipelines.underlines);
+                        encoder.bind(
+                            0,
+                            &ShaderUnderlinesData {
+                                globals,
+                                b_underlines: instance_buf,
+                            },
+                        );
+                        encoder.draw(0, 4, 0, underlines.len() as u32);
+                    }
+                    PrimitiveBatch::MonochromeSprites {
+                        texture_id,
+                        sprites,
+                    } => {
+                        let tex_info = self.atlas.get_texture_info(texture_id);
+                        let instance_buf = self.instance_belt.alloc_data(&sprites, &self.gpu);
+                        let mut encoder = pass.with(&self.pipelines.mono_sprites);
+                        encoder.bind(
+                            0,
+                            &ShaderMonoSpritesData {
+                                globals,
+                                t_sprite: tex_info.raw_view,
+                                s_sprite: self.atlas_sampler,
+                                b_mono_sprites: instance_buf,
+                            },
+                        );
+                        encoder.draw(0, 4, 0, sprites.len() as u32);
+                    }
+                    PrimitiveBatch::PolychromeSprites {
+                        texture_id,
+                        sprites,
+                    } => {
+                        let tex_info = self.atlas.get_texture_info(texture_id);
+                        let instance_buf = self.instance_belt.alloc_data(&sprites, &self.gpu);
+                        let mut encoder = pass.with(&self.pipelines.poly_sprites);
+                        encoder.bind(
+                            0,
+                            &ShaderPolySpritesData {
+                                globals,
+                                t_sprite: tex_info.raw_view,
+                                s_sprite: self.atlas_sampler,
+                                b_poly_sprites: instance_buf,
+                            },
+                        );
+                        encoder.draw(0, 4, 0, sprites.len() as u32);
+                    }
+                    PrimitiveBatch::Surfaces { .. } => {
+                        unimplemented!()
+                    }
+                }
+            }
+        }
+
+        self.command_encoder.present(frame);
+        let sync_point = self.gpu.submit(&mut self.command_encoder);
+
+        self.instance_belt.flush(&sync_point);
+        self.atlas.after_frame(&sync_point);
+        self.atlas.clear_textures(AtlasTextureKind::Path);
+
+        self.wait_for_gpu();
+        self.last_sync_point = Some(sync_point);
+    }
+}

crates/gpui/src/platform/linux/dispatcher.rs 🔗

@@ -0,0 +1,134 @@
+#![allow(non_upper_case_globals)]
+#![allow(non_camel_case_types)]
+#![allow(non_snake_case)]
+
+use crate::{PlatformDispatcher, TaskLabel};
+use async_task::Runnable;
+use parking::{Parker, Unparker};
+use parking_lot::Mutex;
+use std::{
+    panic,
+    sync::Arc,
+    thread,
+    time::{Duration, Instant},
+};
+use xcb::x;
+
+pub(crate) struct LinuxDispatcher {
+    xcb_connection: Arc<xcb::Connection>,
+    x_listener_window: x::Window,
+    parker: Mutex<Parker>,
+    timed_tasks: Mutex<Vec<(Instant, Runnable)>>,
+    main_sender: flume::Sender<Runnable>,
+    background_sender: flume::Sender<Runnable>,
+    _background_thread: thread::JoinHandle<()>,
+    main_thread_id: thread::ThreadId,
+}
+
+impl LinuxDispatcher {
+    pub fn new(
+        main_sender: flume::Sender<Runnable>,
+        xcb_connection: &Arc<xcb::Connection>,
+        x_root_index: i32,
+    ) -> Self {
+        let x_listener_window = xcb_connection.generate_id();
+        let screen = xcb_connection
+            .get_setup()
+            .roots()
+            .nth(x_root_index as usize)
+            .unwrap();
+        xcb_connection.send_request(&x::CreateWindow {
+            depth: 0,
+            wid: x_listener_window,
+            parent: screen.root(),
+            x: 0,
+            y: 0,
+            width: 1,
+            height: 1,
+            border_width: 0,
+            class: x::WindowClass::InputOnly,
+            visual: screen.root_visual(),
+            value_list: &[],
+        });
+
+        let (background_sender, background_receiver) = flume::unbounded::<Runnable>();
+        let background_thread = thread::spawn(move || {
+            for runnable in background_receiver {
+                let _ignore_panic = panic::catch_unwind(|| runnable.run());
+            }
+        });
+        LinuxDispatcher {
+            xcb_connection: Arc::clone(xcb_connection),
+            x_listener_window,
+            parker: Mutex::new(Parker::new()),
+            timed_tasks: Mutex::new(Vec::new()),
+            main_sender,
+            background_sender,
+            _background_thread: background_thread,
+            main_thread_id: thread::current().id(),
+        }
+    }
+}
+
+impl Drop for LinuxDispatcher {
+    fn drop(&mut self) {
+        self.xcb_connection.send_request(&x::DestroyWindow {
+            window: self.x_listener_window,
+        });
+    }
+}
+
+impl PlatformDispatcher for LinuxDispatcher {
+    fn is_main_thread(&self) -> bool {
+        thread::current().id() == self.main_thread_id
+    }
+
+    fn dispatch(&self, runnable: Runnable, _: Option<TaskLabel>) {
+        self.background_sender.send(runnable).unwrap();
+    }
+
+    fn dispatch_on_main_thread(&self, runnable: Runnable) {
+        self.main_sender.send(runnable).unwrap();
+        // Send a message to the invisible window, forcing
+        // the main loop to wake up and dispatch the runnable.
+        self.xcb_connection.send_request(&x::SendEvent {
+            propagate: false,
+            destination: x::SendEventDest::Window(self.x_listener_window),
+            event_mask: x::EventMask::NO_EVENT,
+            event: &x::VisibilityNotifyEvent::new(
+                self.x_listener_window,
+                x::Visibility::Unobscured,
+            ),
+        });
+        self.xcb_connection.flush().unwrap();
+    }
+
+    fn dispatch_after(&self, duration: Duration, runnable: Runnable) {
+        let moment = Instant::now() + duration;
+        let mut timed_tasks = self.timed_tasks.lock();
+        timed_tasks.push((moment, runnable));
+        timed_tasks.sort_unstable_by(|&(ref a, _), &(ref b, _)| b.cmp(a));
+    }
+
+    fn tick(&self, background_only: bool) -> bool {
+        let mut timed_tasks = self.timed_tasks.lock();
+        let old_count = timed_tasks.len();
+        while let Some(&(moment, _)) = timed_tasks.last() {
+            if moment <= Instant::now() {
+                let (_, runnable) = timed_tasks.pop().unwrap();
+                runnable.run();
+            } else {
+                break;
+            }
+        }
+        timed_tasks.len() != old_count
+    }
+
+    fn park(&self) {
+        self.parker.lock().park()
+    }
+
+    fn unparker(&self) -> Unparker {
+        self.parker.lock().unparker()
+    }
+}

crates/gpui/src/platform/linux/display.rs 🔗

@@ -0,0 +1,41 @@
+use crate::{Bounds, DisplayId, GlobalPixels, PlatformDisplay, Size};
+use anyhow::Result;
+use uuid::Uuid;
+
+#[derive(Debug)]
+pub(crate) struct LinuxDisplay {
+    x_screen_index: i32,
+    bounds: Bounds<GlobalPixels>,
+    uuid: Uuid,
+}
+
+impl LinuxDisplay {
+    pub(crate) fn new(xc: &xcb::Connection, x_screen_index: i32) -> Self {
+        let screen = xc.get_setup().roots().nth(x_screen_index as usize).unwrap();
+        Self {
+            x_screen_index,
+            bounds: Bounds {
+                origin: Default::default(),
+                size: Size {
+                    width: GlobalPixels(screen.width_in_pixels() as f32),
+                    height: GlobalPixels(screen.height_in_pixels() as f32),
+                },
+            },
+            uuid: Uuid::from_bytes([0; 16]),
+        }
+    }
+}
+
+impl PlatformDisplay for LinuxDisplay {
+    fn id(&self) -> DisplayId {
+        DisplayId(self.x_screen_index as u32)
+    }
+
+    fn uuid(&self) -> Result<Uuid> {
+        Ok(self.uuid)
+    }
+
+    fn bounds(&self) -> Bounds<GlobalPixels> {
+        self.bounds
+    }
+}

crates/gpui/src/platform/linux/platform.rs 🔗

@@ -0,0 +1,381 @@
+#![allow(unused)]
+
+use crate::{
+    Action, AnyWindowHandle, BackgroundExecutor, Bounds, ClipboardItem, CursorStyle, DisplayId,
+    ForegroundExecutor, Keymap, LinuxDispatcher, LinuxDisplay, LinuxTextSystem, LinuxWindow,
+    LinuxWindowState, Menu, PathPromptOptions, Platform, PlatformDisplay, PlatformInput,
+    PlatformTextSystem, PlatformWindow, Point, Result, SemanticVersion, Size, Task, WindowOptions,
+};
+
+use async_task::Runnable;
+use collections::{HashMap, HashSet};
+use futures::channel::oneshot;
+use parking_lot::Mutex;
+
+use std::{
+    path::{Path, PathBuf},
+    rc::Rc,
+    sync::Arc,
+    time::Duration,
+};
+use time::UtcOffset;
+use xcb::{x, Xid as _};
+
+xcb::atoms_struct! {
+    #[derive(Debug)]
+    pub(crate) struct XcbAtoms {
+        pub wm_protocols    => b"WM_PROTOCOLS",
+        pub wm_del_window   => b"WM_DELETE_WINDOW",
+        wm_state        => b"_NET_WM_STATE",
+        wm_state_maxv   => b"_NET_WM_STATE_MAXIMIZED_VERT",
+        wm_state_maxh   => b"_NET_WM_STATE_MAXIMIZED_HORZ",
+    }
+}
+
+#[derive(Default)]
+struct Callbacks {
+    open_urls: Option<Box<dyn FnMut(Vec<String>)>>,
+    become_active: Option<Box<dyn FnMut()>>,
+    resign_active: Option<Box<dyn FnMut()>>,
+    quit: Option<Box<dyn FnMut()>>,
+    reopen: Option<Box<dyn FnMut()>>,
+    event: Option<Box<dyn FnMut(PlatformInput) -> bool>>,
+    app_menu_action: Option<Box<dyn FnMut(&dyn Action)>>,
+    will_open_app_menu: Option<Box<dyn FnMut()>>,
+    validate_app_menu_command: Option<Box<dyn FnMut(&dyn Action) -> bool>>,
+}
+
+pub(crate) struct LinuxPlatform {
+    xcb_connection: Arc<xcb::Connection>,
+    x_root_index: i32,
+    atoms: XcbAtoms,
+    background_executor: BackgroundExecutor,
+    foreground_executor: ForegroundExecutor,
+    main_receiver: flume::Receiver<Runnable>,
+    text_system: Arc<LinuxTextSystem>,
+    callbacks: Mutex<Callbacks>,
+    state: Mutex<LinuxPlatformState>,
+}
+
+pub(crate) struct LinuxPlatformState {
+    quit_requested: bool,
+    windows: HashMap<x::Window, Arc<LinuxWindowState>>,
+}
+
+impl Default for LinuxPlatform {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl LinuxPlatform {
+    pub(crate) fn new() -> Self {
+        let (xcb_connection, x_root_index) = xcb::Connection::connect(None).unwrap();
+        let atoms = XcbAtoms::intern_all(&xcb_connection).unwrap();
+
+        let xcb_connection = Arc::new(xcb_connection);
+        let (main_sender, main_receiver) = flume::unbounded::<Runnable>();
+        let dispatcher = Arc::new(LinuxDispatcher::new(
+            main_sender,
+            &xcb_connection,
+            x_root_index,
+        ));
+
+        Self {
+            xcb_connection,
+            x_root_index,
+            atoms,
+            background_executor: BackgroundExecutor::new(dispatcher.clone()),
+            foreground_executor: ForegroundExecutor::new(dispatcher.clone()),
+            main_receiver,
+            text_system: Arc::new(LinuxTextSystem::new()),
+            callbacks: Mutex::new(Callbacks::default()),
+            state: Mutex::new(LinuxPlatformState {
+                quit_requested: false,
+                windows: HashMap::default(),
+            }),
+        }
+    }
+}
+
+impl Platform for LinuxPlatform {
+    fn background_executor(&self) -> BackgroundExecutor {
+        self.background_executor.clone()
+    }
+
+    fn foreground_executor(&self) -> ForegroundExecutor {
+        self.foreground_executor.clone()
+    }
+
+    fn text_system(&self) -> Arc<dyn PlatformTextSystem> {
+        self.text_system.clone()
+    }
+
+    fn run(&self, on_finish_launching: Box<dyn FnOnce()>) {
+        on_finish_launching();
+        //Note: here and below, don't keep the lock() open when calling
+        // into window functions as they may invoke callbacks that need
+        // to immediately access the platform (self).
+        while !self.state.lock().quit_requested {
+            let event = self.xcb_connection.wait_for_event().unwrap();
+            match event {
+                xcb::Event::X(x::Event::ClientMessage(ev)) => {
+                    if let x::ClientMessageData::Data32([atom, ..]) = ev.data() {
+                        if atom == self.atoms.wm_del_window.resource_id() {
+                            // window "x" button clicked by user, we gracefully exit
+                            let window = self.state.lock().windows.remove(&ev.window()).unwrap();
+                            window.destroy();
+                            if self.state.lock().windows.is_empty() {
+                                if let Some(ref mut fun) = self.callbacks.lock().quit {
+                                    fun();
+                                }
+                            }
+                        }
+                    }
+                }
+                xcb::Event::X(x::Event::Expose(ev)) => {
+                    let window = {
+                        let state = self.state.lock();
+                        Arc::clone(&state.windows[&ev.window()])
+                    };
+                    window.expose();
+                }
+                xcb::Event::X(x::Event::ConfigureNotify(ev)) => {
+                    let bounds = Bounds {
+                        origin: Point {
+                            x: ev.x().into(),
+                            y: ev.y().into(),
+                        },
+                        size: Size {
+                            width: ev.width().into(),
+                            height: ev.height().into(),
+                        },
+                    };
+                    let window = {
+                        let state = self.state.lock();
+                        Arc::clone(&state.windows[&ev.window()])
+                    };
+                    window.configure(bounds)
+                }
+                _ => {}
+            }
+
+            if let Ok(runnable) = self.main_receiver.try_recv() {
+                runnable.run();
+            }
+        }
+    }
+
+    fn quit(&self) {
+        self.state.lock().quit_requested = true;
+    }
+
+    //todo!(linux)
+    fn restart(&self) {}
+
+    //todo!(linux)
+    fn activate(&self, ignoring_other_apps: bool) {}
+
+    //todo!(linux)
+    fn hide(&self) {}
+
+    //todo!(linux)
+    fn hide_other_apps(&self) {}
+
+    //todo!(linux)
+    fn unhide_other_apps(&self) {}
+
+    fn displays(&self) -> Vec<Rc<dyn PlatformDisplay>> {
+        let setup = self.xcb_connection.get_setup();
+        setup
+            .roots()
+            .enumerate()
+            .map(|(root_id, _)| {
+                Rc::new(LinuxDisplay::new(&self.xcb_connection, root_id as i32))
+                    as Rc<dyn PlatformDisplay>
+            })
+            .collect()
+    }
+
+    fn display(&self, id: DisplayId) -> Option<Rc<dyn PlatformDisplay>> {
+        Some(Rc::new(LinuxDisplay::new(
+            &self.xcb_connection,
+            id.0 as i32,
+        )))
+    }
+
+    //todo!(linux)
+    fn active_window(&self) -> Option<AnyWindowHandle> {
+        None
+    }
+
+    fn open_window(
+        &self,
+        handle: AnyWindowHandle,
+        options: WindowOptions,
+    ) -> Box<dyn PlatformWindow> {
+        let x_window = self.xcb_connection.generate_id();
+
+        let window_ptr = Arc::new(LinuxWindowState::new(
+            options,
+            &self.xcb_connection,
+            self.x_root_index,
+            x_window,
+            &self.atoms,
+        ));
+
+        self.state
+            .lock()
+            .windows
+            .insert(x_window, Arc::clone(&window_ptr));
+        Box::new(LinuxWindow(window_ptr))
+    }
+
+    fn set_display_link_output_callback(
+        &self,
+        display_id: DisplayId,
+        callback: Box<dyn FnMut() + Send>,
+    ) {
+        log::warn!("unimplemented: set_display_link_output_callback");
+    }
+
+    fn start_display_link(&self, display_id: DisplayId) {
+        unimplemented!()
+    }
+
+    fn stop_display_link(&self, display_id: DisplayId) {
+        unimplemented!()
+    }
+
+    fn open_url(&self, url: &str) {
+        unimplemented!()
+    }
+
+    fn on_open_urls(&self, callback: Box<dyn FnMut(Vec<String>)>) {
+        self.callbacks.lock().open_urls = Some(callback);
+    }
+
+    fn prompt_for_paths(
+        &self,
+        options: PathPromptOptions,
+    ) -> oneshot::Receiver<Option<Vec<PathBuf>>> {
+        unimplemented!()
+    }
+
+    fn prompt_for_new_path(&self, directory: &Path) -> oneshot::Receiver<Option<PathBuf>> {
+        unimplemented!()
+    }
+
+    fn reveal_path(&self, path: &Path) {
+        unimplemented!()
+    }
+
+    fn on_become_active(&self, callback: Box<dyn FnMut()>) {
+        self.callbacks.lock().become_active = Some(callback);
+    }
+
+    fn on_resign_active(&self, callback: Box<dyn FnMut()>) {
+        self.callbacks.lock().resign_active = Some(callback);
+    }
+
+    fn on_quit(&self, callback: Box<dyn FnMut()>) {
+        self.callbacks.lock().quit = Some(callback);
+    }
+
+    fn on_reopen(&self, callback: Box<dyn FnMut()>) {
+        self.callbacks.lock().reopen = Some(callback);
+    }
+
+    fn on_event(&self, callback: Box<dyn FnMut(PlatformInput) -> bool>) {
+        self.callbacks.lock().event = Some(callback);
+    }
+
+    fn on_app_menu_action(&self, callback: Box<dyn FnMut(&dyn Action)>) {
+        self.callbacks.lock().app_menu_action = Some(callback);
+    }
+
+    fn on_will_open_app_menu(&self, callback: Box<dyn FnMut()>) {
+        self.callbacks.lock().will_open_app_menu = Some(callback);
+    }
+
+    fn on_validate_app_menu_command(&self, callback: Box<dyn FnMut(&dyn Action) -> bool>) {
+        self.callbacks.lock().validate_app_menu_command = Some(callback);
+    }
+
+    fn os_name(&self) -> &'static str {
+        "Linux"
+    }
+
+    fn double_click_interval(&self) -> Duration {
+        Duration::default()
+    }
+
+    fn os_version(&self) -> Result<SemanticVersion> {
+        Ok(SemanticVersion {
+            major: 1,
+            minor: 0,
+            patch: 0,
+        })
+    }
+
+    fn app_version(&self) -> Result<SemanticVersion> {
+        Ok(SemanticVersion {
+            major: 1,
+            minor: 0,
+            patch: 0,
+        })
+    }
+
+    fn app_path(&self) -> Result<PathBuf> {
+        unimplemented!()
+    }
+
+    //todo!(linux)
+    fn set_menus(&self, menus: Vec<Menu>, keymap: &Keymap) {}
+
+    fn local_timezone(&self) -> UtcOffset {
+        UtcOffset::UTC
+    }
+
+    fn path_for_auxiliary_executable(&self, name: &str) -> Result<PathBuf> {
+        unimplemented!()
+    }
+
+    //todo!(linux)
+    fn set_cursor_style(&self, style: CursorStyle) {}
+
+    //todo!(linux)
+    fn should_auto_hide_scrollbars(&self) -> bool {}
+
+    //todo!(linux)
+    fn write_to_clipboard(&self, item: ClipboardItem) {}
+
+    //todo!(linux)
+    fn read_from_clipboard(&self) -> Option<ClipboardItem> {
+        None
+    }
+
+    fn write_credentials(&self, url: &str, username: &str, password: &[u8]) -> Task<Result<()>> {
+        unimplemented!()
+    }
+
+    fn read_credentials(&self, url: &str) -> Task<Result<Option<(String, Vec<u8>)>>> {
+        unimplemented!()
+    }
+
+    fn delete_credentials(&self, url: &str) -> Task<Result<()>> {
+        unimplemented!()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::ClipboardItem;
+
+    use super::*;
+
+    fn build_platform() -> LinuxPlatform {
+        let platform = LinuxPlatform::new();
+        platform
+    }
+}

crates/gpui/src/platform/linux/shaders.wgsl 🔗

@@ -0,0 +1,569 @@
+struct Globals {
+    viewport_size: vec2<f32>,
+    pad: vec2<u32>,
+}
+
+var<uniform> globals: Globals;
+var t_sprite: texture_2d<f32>;
+var s_sprite: sampler;
+
+const M_PI_F: f32 = 3.1415926;
+const GRAYSCALE_FACTORS: vec3<f32> = vec3<f32>(0.2126, 0.7152, 0.0722);
+
+struct ViewId {
+    lo: u32,
+    hi: u32,
+}
+
+struct Bounds {
+    origin: vec2<f32>,
+    size: vec2<f32>,
+}
+struct Corners {
+    top_left: f32,
+    top_right: f32,
+    bottom_right: f32,
+    bottom_left: f32,
+}
+struct Edges {
+    top: f32,
+    right: f32,
+    bottom: f32,
+    left: f32,
+}
+struct Hsla {
+    h: f32,
+    s: f32,
+    l: f32,
+    a: f32,
+}
+
+struct AtlasTextureId {
+    index: u32,
+    kind: u32,
+}
+
+struct AtlasBounds {
+    origin: vec2<i32>,
+    size: vec2<i32>,
+}
+struct AtlasTile {
+    texture_id: AtlasTextureId,
+    tile_id: u32,
+    padding: u32,
+    bounds: AtlasBounds,
+}
+
+fn to_device_position_impl(position: vec2<f32>) -> vec4<f32> {
+    let device_position = position / globals.viewport_size * vec2<f32>(2.0, -2.0) + vec2<f32>(-1.0, 1.0);
+    return vec4<f32>(device_position, 0.0, 1.0);
+}
+
+fn to_device_position(unit_vertex: vec2<f32>, bounds: Bounds) -> vec4<f32> {
+    let position = unit_vertex * vec2<f32>(bounds.size) + bounds.origin;
+    return to_device_position_impl(position);
+}
+
+fn to_tile_position(unit_vertex: vec2<f32>, tile: AtlasTile) -> vec2<f32> {
+  let atlas_size = vec2<f32>(textureDimensions(t_sprite, 0));
+  return (vec2<f32>(tile.bounds.origin) + unit_vertex * vec2<f32>(tile.bounds.size)) / atlas_size;
+}
+
+fn distance_from_clip_rect_impl(position: vec2<f32>, clip_bounds: Bounds) -> vec4<f32> {
+    let tl = position - clip_bounds.origin;
+    let br = clip_bounds.origin + clip_bounds.size - position;
+    return vec4<f32>(tl.x, br.x, tl.y, br.y);
+}
+
+fn distance_from_clip_rect(unit_vertex: vec2<f32>, bounds: Bounds, clip_bounds: Bounds) -> vec4<f32> {
+    let position = unit_vertex * vec2<f32>(bounds.size) + bounds.origin;
+    return distance_from_clip_rect_impl(position, clip_bounds);
+}
+
+fn hsla_to_rgba(hsla: Hsla) -> vec4<f32> {
+    let h = hsla.h * 6.0; // Now, it's an angle but scaled in [0, 6) range
+    let s = hsla.s;
+    let l = hsla.l;
+    let a = hsla.a;
+
+    let c = (1.0 - abs(2.0 * l - 1.0)) * s;
+    let x = c * (1.0 - abs(h % 2.0 - 1.0));
+    let m = l - c / 2.0;
+
+    var color = vec4<f32>(m, m, m, a);
+
+    if (h >= 0.0 && h < 1.0) {
+        color.r += c;
+        color.g += x;
+    } else if (h >= 1.0 && h < 2.0) {
+        color.r += x;
+        color.g += c;
+    } else if (h >= 2.0 && h < 3.0) {
+        color.g += c;
+        color.b += x;
+    } else if (h >= 3.0 && h < 4.0) {
+        color.g += x;
+        color.b += c;
+    } else if (h >= 4.0 && h < 5.0) {
+        color.r += x;
+        color.b += c;
+    } else {
+        color.r += c;
+        color.b += x;
+    }
+
+    return color;
+}
+
+fn over(below: vec4<f32>, above: vec4<f32>) -> vec4<f32> {
+    let alpha = above.a + below.a * (1.0 - above.a);
+    let color = (above.rgb * above.a + below.rgb * below.a * (1.0 - above.a)) / alpha;
+    return vec4<f32>(color, alpha);
+}
+
+// A standard gaussian function, used for weighting samples
+fn gaussian(x: f32, sigma: f32) -> f32{
+    return exp(-(x * x) / (2.0 * sigma * sigma)) / (sqrt(2.0 * M_PI_F) * sigma);
+}
+
+// This approximates the error function, needed for the gaussian integral
+fn erf(v: vec2<f32>) -> vec2<f32> {
+    let s = sign(v);
+    let a = abs(v);
+    let r1 = 1.0 + (0.278393 + (0.230389 + 0.078108 * (a * a)) * a) * a;
+    let r2 = r1 * r1;
+    return s - s / (r2 * r2);
+}
+
+fn blur_along_x(x: f32, y: f32, sigma: f32, corner: f32, half_size: vec2<f32>) -> f32 {
+  let delta = min(half_size.y - corner - abs(y), 0.0);
+  let curved = half_size.x - corner + sqrt(max(0.0, corner * corner - delta * delta));
+  let integral = 0.5 + 0.5 * erf((x + vec2<f32>(-curved, curved)) * (sqrt(0.5) / sigma));
+  return integral.y - integral.x;
+}
+
+fn pick_corner_radius(point: vec2<f32>, radii: Corners) -> f32 {
+    if (point.x < 0.0) {
+        if (point.y < 0.0) {
+            return radii.top_left;
+        } else {
+            return radii.bottom_left;
+        }
+    } else {
+        if (point.y < 0.0) {
+            return radii.top_right;
+        } else {
+            return radii.bottom_right;
+        }
+    }
+}
+
+fn quad_sdf(point: vec2<f32>, bounds: Bounds, corner_radii: Corners) -> f32 {
+    let half_size = bounds.size / 2.0;
+    let center = bounds.origin + half_size;
+    let center_to_point = point - center;
+    let corner_radius = pick_corner_radius(center_to_point, corner_radii);
+    let rounded_edge_to_point = abs(center_to_point) - half_size + corner_radius;
+    return length(max(vec2<f32>(0.0), rounded_edge_to_point)) +
+        min(0.0, max(rounded_edge_to_point.x, rounded_edge_to_point.y)) -
+        corner_radius;
+}
+
+// --- quads --- //
+
+struct Quad {
+    view_id: ViewId,
+    layer_id: u32,
+    order: u32,
+    bounds: Bounds,
+    content_mask: Bounds,
+    background: Hsla,
+    border_color: Hsla,
+    corner_radii: Corners,
+    border_widths: Edges,
+}
+var<storage, read> b_quads: array<Quad>;
+
+struct QuadVarying {
+    @builtin(position) position: vec4<f32>,
+    @location(0) @interpolate(flat) background_color: vec4<f32>,
+    @location(1) @interpolate(flat) border_color: vec4<f32>,
+    @location(2) @interpolate(flat) quad_id: u32,
+    //TODO: use `clip_distance` once Naga supports it
+    @location(3) clip_distances: vec4<f32>,
+}
+
+@vertex
+fn vs_quad(@builtin(vertex_index) vertex_id: u32, @builtin(instance_index) instance_id: u32) -> QuadVarying {
+    let unit_vertex = vec2<f32>(f32(vertex_id & 1u), 0.5 * f32(vertex_id & 2u));
+    let quad = b_quads[instance_id];
+
+    var out = QuadVarying();
+    out.position = to_device_position(unit_vertex, quad.bounds);
+    out.background_color = hsla_to_rgba(quad.background);
+    out.border_color = hsla_to_rgba(quad.border_color);
+    out.quad_id = instance_id;
+    out.clip_distances = distance_from_clip_rect(unit_vertex, quad.bounds, quad.content_mask);
+    return out;
+}
+
+@fragment
+fn fs_quad(input: QuadVarying) -> @location(0) vec4<f32> {
+    // Alpha clip first, since we don't have `clip_distance`.
+    if (any(input.clip_distances < vec4<f32>(0.0))) {
+        return vec4<f32>(0.0);
+    }
+
+    let quad = b_quads[input.quad_id];
+    let half_size = quad.bounds.size / 2.0;
+    let center = quad.bounds.origin + half_size;
+    let center_to_point = input.position.xy - center;
+
+    let corner_radius = pick_corner_radius(center_to_point, quad.corner_radii);
+
+    let rounded_edge_to_point = abs(center_to_point) - half_size + corner_radius;
+    let distance =
+      length(max(vec2<f32>(0.0), rounded_edge_to_point)) +
+      min(0.0, max(rounded_edge_to_point.x, rounded_edge_to_point.y)) -
+      corner_radius;
+
+    let vertical_border = select(quad.border_widths.left, quad.border_widths.right, center_to_point.x > 0.0);
+    let horizontal_border = select(quad.border_widths.top, quad.border_widths.bottom, center_to_point.y > 0.0);
+    let inset_size = half_size - corner_radius - vec2<f32>(vertical_border, horizontal_border);
+    let point_to_inset_corner = abs(center_to_point) - inset_size;
+
+    var border_width = 0.0;
+    if (point_to_inset_corner.x < 0.0 && point_to_inset_corner.y < 0.0) {
+        border_width = 0.0;
+    } else if (point_to_inset_corner.y > point_to_inset_corner.x) {
+        border_width = horizontal_border;
+    } else {
+        border_width = vertical_border;
+    }
+
+    var color = input.background_color;
+    if (border_width > 0.0) {
+        let inset_distance = distance + border_width;
+        // Blend the border on top of the background and then linearly interpolate
+        // between the two as we slide inside the background.
+        let blended_border = over(input.background_color, input.border_color);
+        color = mix(blended_border, input.background_color,
+                    saturate(0.5 - inset_distance));
+    }
+
+    return color * vec4<f32>(1.0, 1.0, 1.0, saturate(0.5 - distance));
+}
+
+// --- shadows --- //
+
+struct Shadow {
+    view_id: ViewId,
+    layer_id: u32,
+    order: u32,
+    bounds: Bounds,
+    corner_radii: Corners,
+    content_mask: Bounds,
+    color: Hsla,
+    blur_radius: f32,
+    pad: u32,
+}
+var<storage, read> b_shadows: array<Shadow>;
+
+struct ShadowVarying {
+    @builtin(position) position: vec4<f32>,
+    @location(0) @interpolate(flat) color: vec4<f32>,
+    @location(1) @interpolate(flat) shadow_id: u32,
+    //TODO: use `clip_distance` once Naga supports it
+    @location(3) clip_distances: vec4<f32>,
+}
+
+@vertex
+fn vs_shadow(@builtin(vertex_index) vertex_id: u32, @builtin(instance_index) instance_id: u32) -> ShadowVarying {
+    let unit_vertex = vec2<f32>(f32(vertex_id & 1u), 0.5 * f32(vertex_id & 2u));
+    var shadow = b_shadows[instance_id];
+
+    let margin = 3.0 * shadow.blur_radius;
+    // Set the bounds of the shadow and adjust its size based on the shadow's
+    // spread radius to achieve the spreading effect
+    shadow.bounds.origin -= vec2<f32>(margin);
+    shadow.bounds.size += 2.0 * vec2<f32>(margin);
+
+    var out = ShadowVarying();
+    out.position = to_device_position(unit_vertex, shadow.bounds);
+    out.color = hsla_to_rgba(shadow.color);
+    out.shadow_id = instance_id;
+    out.clip_distances = distance_from_clip_rect(unit_vertex, shadow.bounds, shadow.content_mask);
+    return out;
+}
+
+@fragment
+fn fs_shadow(input: ShadowVarying) -> @location(0) vec4<f32> {
+    // Alpha clip first, since we don't have `clip_distance`.
+    if (any(input.clip_distances < vec4<f32>(0.0))) {
+        return vec4<f32>(0.0);
+    }
+
+    let shadow = b_shadows[input.shadow_id];
+    let half_size = shadow.bounds.size / 2.0;
+    let center = shadow.bounds.origin + half_size;
+    let center_to_point = input.position.xy - center;
+
+    let corner_radius = pick_corner_radius(center_to_point, shadow.corner_radii);
+
+    // The signal is only non-zero in a limited range, so don't waste samples
+    let low = center_to_point.y - half_size.y;
+    let high = center_to_point.y + half_size.y;
+    let start = clamp(-3.0 * shadow.blur_radius, low, high);
+    let end = clamp(3.0 * shadow.blur_radius, low, high);
+
+    // Accumulate samples (we can get away with surprisingly few samples)
+    let step = (end - start) / 4.0;
+    var y = start + step * 0.5;
+    var alpha = 0.0;
+    for (var i = 0; i < 4; i += 1) {
+        let blur = blur_along_x(center_to_point.x, center_to_point.y - y,
+            shadow.blur_radius, corner_radius, half_size);
+        alpha +=  blur * gaussian(y, shadow.blur_radius) * step;
+        y += step;
+    }
+
+    return input.color * vec4<f32>(1.0, 1.0, 1.0, alpha);
+}
+
+// --- path rasterization --- //
+
+struct PathVertex {
+    xy_position: vec2<f32>,
+    st_position: vec2<f32>,
+    content_mask: Bounds,
+}
+var<storage, read> b_path_vertices: array<PathVertex>;
+
+struct PathRasterizationVarying {
+    @builtin(position) position: vec4<f32>,
+    @location(0) st_position: vec2<f32>,
+    //TODO: use `clip_distance` once Naga supports it
+    @location(3) clip_distances: vec4<f32>,
+}
+
+@vertex
+fn vs_path_rasterization(@builtin(vertex_index) vertex_id: u32) -> PathRasterizationVarying {
+    let v = b_path_vertices[vertex_id];
+
+    var out = PathRasterizationVarying();
+    out.position = to_device_position_impl(v.xy_position);
+    out.st_position = v.st_position;
+    out.clip_distances = distance_from_clip_rect_impl(v.xy_position, v.content_mask);
+    return out;
+}
+
+@fragment
+fn fs_path_rasterization(input: PathRasterizationVarying) -> @location(0) f32 {
+    let dx = dpdx(input.st_position);
+    let dy = dpdy(input.st_position);
+    if (any(input.clip_distances < vec4<f32>(0.0))) {
+        return 0.0;
+    }
+
+    let gradient = 2.0 * input.st_position * vec2<f32>(dx.x, dy.x) - vec2<f32>(dx.y, dy.y);
+    let f = input.st_position.x * input.st_position.x - input.st_position.y;
+    let distance = f / length(gradient);
+    return saturate(0.5 - distance);
+}
+
+// --- paths --- //
+
+struct PathSprite {
+    bounds: Bounds,
+    color: Hsla,
+    tile: AtlasTile,
+}
+var<storage, read> b_path_sprites: array<PathSprite>;
+
+struct PathVarying {
+    @builtin(position) position: vec4<f32>,
+    @location(0) tile_position: vec2<f32>,
+    @location(1) color: vec4<f32>,
+}
+
+@vertex
+fn vs_path(@builtin(vertex_index) vertex_id: u32, @builtin(instance_index) instance_id: u32) -> PathVarying {
+    let unit_vertex = vec2<f32>(f32(vertex_id & 1u), 0.5 * f32(vertex_id & 2u));
+    let sprite = b_path_sprites[instance_id];
+    // Don't apply content mask because it was already accounted for when rasterizing the path.
+
+    var out = PathVarying();
+    out.position = to_device_position(unit_vertex, sprite.bounds);
+    out.tile_position = to_tile_position(unit_vertex, sprite.tile);
+    out.color = hsla_to_rgba(sprite.color);
+    return out;
+}
+
+@fragment
+fn fs_path(input: PathVarying) -> @location(0) vec4<f32> {
+    let sample = textureSample(t_sprite, s_sprite, input.tile_position).r;
+    let mask = 1.0 - abs(1.0 - sample % 2.0);
+    return input.color * mask;
+}
+
+// --- underlines --- //
+
+struct Underline {
+    view_id: ViewId,
+    layer_id: u32,
+    order: u32,
+    bounds: Bounds,
+    content_mask: Bounds,
+    color: Hsla,
+    thickness: f32,
+    wavy: u32,
+}
+var<storage, read> b_underlines: array<Underline>;
+
+struct UnderlineVarying {
+    @builtin(position) position: vec4<f32>,
+    @location(0) @interpolate(flat) color: vec4<f32>,
+    @location(1) @interpolate(flat) underline_id: u32,
+    //TODO: use `clip_distance` once Naga supports it
+    @location(3) clip_distances: vec4<f32>,
+}
+
+@vertex
+fn vs_underline(@builtin(vertex_index) vertex_id: u32, @builtin(instance_index) instance_id: u32) -> UnderlineVarying {
+    let unit_vertex = vec2<f32>(f32(vertex_id & 1u), 0.5 * f32(vertex_id & 2u));
+    let underline = b_underlines[instance_id];
+
+    var out = UnderlineVarying();
+    out.position = to_device_position(unit_vertex, underline.bounds);
+    out.color = hsla_to_rgba(underline.color);
+    out.underline_id = instance_id;
+    out.clip_distances = distance_from_clip_rect(unit_vertex, underline.bounds, underline.content_mask);
+    return out;
+}
+
+@fragment
+fn fs_underline(input: UnderlineVarying) -> @location(0) vec4<f32> {
+    // Alpha clip first, since we don't have `clip_distance`.
+    if (any(input.clip_distances < vec4<f32>(0.0))) {
+        return vec4<f32>(0.0);
+    }
+
+    let underline = b_underlines[input.underline_id];
+    if ((underline.wavy & 0xFFu) == 0u)
+    {
+        return vec4<f32>(0.0);
+    }
+
+    let half_thickness = underline.thickness * 0.5;
+    let st = (input.position.xy - underline.bounds.origin) / underline.bounds.size.y - vec2<f32>(0.0, 0.5);
+    let frequency = M_PI_F * 3.0 * underline.thickness / 8.0;
+    let amplitude = 1.0 / (2.0 * underline.thickness);
+    let sine = sin(st.x * frequency) * amplitude;
+    let dSine = cos(st.x * frequency) * amplitude * frequency;
+    let distance = (st.y - sine) / sqrt(1.0 + dSine * dSine);
+    let distance_in_pixels = distance * underline.bounds.size.y;
+    let distance_from_top_border = distance_in_pixels - half_thickness;
+    let distance_from_bottom_border = distance_in_pixels + half_thickness;
+    let alpha = saturate(0.5 - max(-distance_from_bottom_border, distance_from_top_border));
+    return input.color * vec4<f32>(1.0, 1.0, 1.0, alpha);
+}
+
+// --- monochrome sprites --- //
+
+struct MonochromeSprite {
+    view_id: ViewId,
+    layer_id: u32,
+    order: u32,
+    bounds: Bounds,
+    content_mask: Bounds,
+    color: Hsla,
+    tile: AtlasTile,
+}
+var<storage, read> b_mono_sprites: array<MonochromeSprite>;
+
+struct MonoSpriteVarying {
+    @builtin(position) position: vec4<f32>,
+    @location(0) tile_position: vec2<f32>,
+    @location(1) @interpolate(flat) color: vec4<f32>,
+    @location(3) clip_distances: vec4<f32>,
+}
+
+@vertex
+fn vs_mono_sprite(@builtin(vertex_index) vertex_id: u32, @builtin(instance_index) instance_id: u32) -> MonoSpriteVarying {
+    let unit_vertex = vec2<f32>(f32(vertex_id & 1u), 0.5 * f32(vertex_id & 2u));
+    let sprite = b_mono_sprites[instance_id];
+
+    var out = MonoSpriteVarying();
+    out.position = to_device_position(unit_vertex, sprite.bounds);
+    out.tile_position = to_tile_position(unit_vertex, sprite.tile);
+    out.color = hsla_to_rgba(sprite.color);
+    out.clip_distances = distance_from_clip_rect(unit_vertex, sprite.bounds, sprite.content_mask);
+    return out;
+}
+
+@fragment
+fn fs_mono_sprite(input: MonoSpriteVarying) -> @location(0) vec4<f32> {
+    let sample = textureSample(t_sprite, s_sprite, input.tile_position).r;
+    // Alpha clip after using the derivatives.
+    if (any(input.clip_distances < vec4<f32>(0.0))) {
+        return vec4<f32>(0.0);
+    }
+    return input.color * vec4<f32>(1.0, 1.0, 1.0, sample);
+}
+
+// --- polychrome sprites --- //
+
+struct PolychromeSprite {
+    view_id: ViewId,
+    layer_id: u32,
+    order: u32,
+    bounds: Bounds,
+    content_mask: Bounds,
+    corner_radii: Corners,
+    tile: AtlasTile,
+    grayscale: u32,
+    pad: u32,
+}
+var<storage, read> b_poly_sprites: array<PolychromeSprite>;
+
+struct PolySpriteVarying {
+    @builtin(position) position: vec4<f32>,
+    @location(0) tile_position: vec2<f32>,
+    @location(1) @interpolate(flat) sprite_id: u32,
+    @location(3) clip_distances: vec4<f32>,
+}
+
+@vertex
+fn vs_poly_sprite(@builtin(vertex_index) vertex_id: u32, @builtin(instance_index) instance_id: u32) -> PolySpriteVarying {
+    let unit_vertex = vec2<f32>(f32(vertex_id & 1u), 0.5 * f32(vertex_id & 2u));
+    let sprite = b_poly_sprites[instance_id];
+
+    var out = PolySpriteVarying();
+    out.position = to_device_position(unit_vertex, sprite.bounds);
+    out.tile_position = to_tile_position(unit_vertex, sprite.tile);
+    out.sprite_id = instance_id;
+    out.clip_distances = distance_from_clip_rect(unit_vertex, sprite.bounds, sprite.content_mask);
+    return out;
+}
+
+@fragment
+fn fs_poly_sprite(input: PolySpriteVarying) -> @location(0) vec4<f32> {
+    let sample = textureSample(t_sprite, s_sprite, input.tile_position);
+    // Alpha clip after using the derivatives.
+    if (any(input.clip_distances < vec4<f32>(0.0))) {
+        return vec4<f32>(0.0);
+    }
+
+    let sprite = b_poly_sprites[input.sprite_id];
+    let distance = quad_sdf(input.position.xy, sprite.bounds, sprite.corner_radii);
+
+    var color = sample;
+    if ((sprite.grayscale & 0xFFu) != 0u) {
+        let grayscale = dot(color.rgb, GRAYSCALE_FACTORS);
+        color = vec4<f32>(vec3<f32>(grayscale), sample.a);
+    }
+    color.a *= saturate(0.5 - distance);
+    return color;;
+}
+
+// --- surface sprites --- //

crates/gpui/src/platform/linux/text_system.rs 🔗

@@ -0,0 +1,127 @@
+use crate::{
+    Bounds, DevicePixels, Font, FontId, FontMetrics, FontRun, GlyphId, LineLayout, Pixels,
+    PlatformTextSystem, RenderGlyphParams, SharedString, Size,
+};
+use anyhow::Result;
+use collections::HashMap;
+use font_kit::{
+    font::Font as FontKitFont,
+    handle::Handle,
+    hinting::HintingOptions,
+    metrics::Metrics,
+    properties::{Style as FontkitStyle, Weight as FontkitWeight},
+    source::SystemSource,
+    sources::mem::MemSource,
+};
+use parking_lot::RwLock;
+use smallvec::SmallVec;
+use std::borrow::Cow;
+
+pub(crate) struct LinuxTextSystem(RwLock<LinuxTextSystemState>);
+
+struct LinuxTextSystemState {
+    memory_source: MemSource,
+    system_source: SystemSource,
+    fonts: Vec<FontKitFont>,
+    font_selections: HashMap<Font, FontId>,
+    font_ids_by_postscript_name: HashMap<String, FontId>,
+    font_ids_by_family_name: HashMap<SharedString, SmallVec<[FontId; 4]>>,
+    postscript_names_by_font_id: HashMap<FontId, String>,
+}
+
+// todo!(linux): Double check this
+unsafe impl Send for LinuxTextSystemState {}
+unsafe impl Sync for LinuxTextSystemState {}
+
+impl LinuxTextSystem {
+    pub(crate) fn new() -> Self {
+        Self(RwLock::new(LinuxTextSystemState {
+            memory_source: MemSource::empty(),
+            system_source: SystemSource::new(),
+            fonts: Vec::new(),
+            font_selections: HashMap::default(),
+            font_ids_by_postscript_name: HashMap::default(),
+            font_ids_by_family_name: HashMap::default(),
+            postscript_names_by_font_id: HashMap::default(),
+        }))
+    }
+}
+
+impl Default for LinuxTextSystem {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+#[allow(unused)]
+impl PlatformTextSystem for LinuxTextSystem {
+    // todo!(linux)
+    fn add_fonts(&self, fonts: Vec<Cow<'static, [u8]>>) -> Result<()> {
+        Ok(())
+    }
+
+    // todo!(linux)
+    fn all_font_names(&self) -> Vec<String> {
+        Vec::new()
+    }
+
+    // todo!(linux)
+    fn all_font_families(&self) -> Vec<String> {
+        Vec::new()
+    }
+
+    // todo!(linux)
+    fn font_id(&self, descriptor: &Font) -> Result<FontId> {
+        Ok(FontId(0))
+    }
+
+    // todo!(linux)
+    fn font_metrics(&self, font_id: FontId) -> FontMetrics {
+        unimplemented!()
+    }
+
+    // todo!(linux)
+    fn typographic_bounds(&self, font_id: FontId, glyph_id: GlyphId) -> Result<Bounds<f32>> {
+        unimplemented!()
+    }
+
+    // todo!(linux)
+    fn advance(&self, font_id: FontId, glyph_id: GlyphId) -> Result<Size<f32>> {
+        unimplemented!()
+    }
+
+    // todo!(linux)
+    fn glyph_for_char(&self, font_id: FontId, ch: char) -> Option<GlyphId> {
+        None
+    }
+
+    // todo!(linux)
+    fn glyph_raster_bounds(&self, params: &RenderGlyphParams) -> Result<Bounds<DevicePixels>> {
+        unimplemented!()
+    }
+
+    // todo!(linux)
+    fn rasterize_glyph(
+        &self,
+        params: &RenderGlyphParams,
+        raster_bounds: Bounds<DevicePixels>,
+    ) -> Result<(Size<DevicePixels>, Vec<u8>)> {
+        unimplemented!()
+    }
+
+    // todo!(linux)
+    fn layout_line(&self, text: &str, font_size: Pixels, runs: &[FontRun]) -> LineLayout {
+        LineLayout::default() //TODO
+    }
+
+    // todo!(linux)
+    fn wrap_line(
+        &self,
+        text: &str,
+        font_id: FontId,
+        font_size: Pixels,
+        width: Pixels,
+    ) -> Vec<usize> {
+        unimplemented!()
+    }
+}

crates/gpui/src/platform/linux/window.rs 🔗

@@ -0,0 +1,425 @@
+use super::BladeRenderer;
+use crate::{
+    Bounds, GlobalPixels, LinuxDisplay, Pixels, PlatformDisplay, PlatformInputHandler,
+    PlatformWindow, Point, Size, WindowAppearance, WindowBounds, WindowOptions, XcbAtoms,
+};
+use blade_graphics as gpu;
+use parking_lot::Mutex;
+use raw_window_handle as rwh;
+use std::{
+    ffi::c_void,
+    mem,
+    num::NonZeroU32,
+    ptr::NonNull,
+    rc::Rc,
+    sync::{self, Arc},
+};
+use xcb::{x, Xid as _};
+
+#[derive(Default)]
+struct Callbacks {
+    request_frame: Option<Box<dyn FnMut()>>,
+    input: Option<Box<dyn FnMut(crate::PlatformInput) -> bool>>,
+    active_status_change: Option<Box<dyn FnMut(bool)>>,
+    resize: Option<Box<dyn FnMut(Size<Pixels>, f32)>>,
+    fullscreen: Option<Box<dyn FnMut(bool)>>,
+    moved: Option<Box<dyn FnMut()>>,
+    should_close: Option<Box<dyn FnMut() -> bool>>,
+    close: Option<Box<dyn FnOnce()>>,
+    appearance_changed: Option<Box<dyn FnMut()>>,
+}
+
+struct LinuxWindowInner {
+    bounds: Bounds<i32>,
+    scale_factor: f32,
+    renderer: BladeRenderer,
+}
+
+impl LinuxWindowInner {
+    fn content_size(&self) -> Size<Pixels> {
+        let size = self.renderer.viewport_size();
+        Size {
+            width: size.width.into(),
+            height: size.height.into(),
+        }
+    }
+}
+
+fn query_render_extent(xcb_connection: &xcb::Connection, x_window: x::Window) -> gpu::Extent {
+    let cookie = xcb_connection.send_request(&x::GetGeometry {
+        drawable: x::Drawable::Window(x_window),
+    });
+    let reply = xcb_connection.wait_for_reply(cookie).unwrap();
+    println!("Got geometry {:?}", reply);
+    gpu::Extent {
+        width: reply.width() as u32,
+        height: reply.height() as u32,
+        depth: 1,
+    }
+}
+
+struct RawWindow {
+    connection: *mut c_void,
+    screen_id: i32,
+    window_id: u32,
+    visual_id: u32,
+}
+
+pub(crate) struct LinuxWindowState {
+    xcb_connection: Arc<xcb::Connection>,
+    display: Rc<dyn PlatformDisplay>,
+    raw: RawWindow,
+    x_window: x::Window,
+    callbacks: Mutex<Callbacks>,
+    inner: Mutex<LinuxWindowInner>,
+}
+
+#[derive(Clone)]
+pub(crate) struct LinuxWindow(pub(crate) Arc<LinuxWindowState>);
+
+//todo!(linux): Remove other RawWindowHandle implementation
+unsafe impl blade_rwh::HasRawWindowHandle for RawWindow {
+    fn raw_window_handle(&self) -> blade_rwh::RawWindowHandle {
+        let mut wh = blade_rwh::XcbWindowHandle::empty();
+        wh.window = self.window_id;
+        wh.visual_id = self.visual_id;
+        wh.into()
+    }
+}
+unsafe impl blade_rwh::HasRawDisplayHandle for RawWindow {
+    fn raw_display_handle(&self) -> blade_rwh::RawDisplayHandle {
+        let mut dh = blade_rwh::XcbDisplayHandle::empty();
+        dh.connection = self.connection;
+        dh.screen = self.screen_id;
+        dh.into()
+    }
+}
+
+impl rwh::HasWindowHandle for LinuxWindow {
+    fn window_handle(&self) -> Result<rwh::WindowHandle, rwh::HandleError> {
+        Ok(unsafe {
+            let non_zero = NonZeroU32::new(self.0.raw.window_id).unwrap();
+            let handle = rwh::XcbWindowHandle::new(non_zero);
+            rwh::WindowHandle::borrow_raw(handle.into())
+        })
+    }
+}
+impl rwh::HasDisplayHandle for LinuxWindow {
+    fn display_handle(&self) -> Result<rwh::DisplayHandle, rwh::HandleError> {
+        Ok(unsafe {
+            let non_zero = NonNull::new(self.0.raw.connection).unwrap();
+            let handle = rwh::XcbDisplayHandle::new(Some(non_zero), self.0.raw.screen_id);
+            rwh::DisplayHandle::borrow_raw(handle.into())
+        })
+    }
+}
+
+impl LinuxWindowState {
+    pub fn new(
+        options: WindowOptions,
+        xcb_connection: &Arc<xcb::Connection>,
+        x_main_screen_index: i32,
+        x_window: x::Window,
+        atoms: &XcbAtoms,
+    ) -> Self {
+        let x_screen_index = options
+            .display_id
+            .map_or(x_main_screen_index, |did| did.0 as i32);
+        let screen = xcb_connection
+            .get_setup()
+            .roots()
+            .nth(x_screen_index as usize)
+            .unwrap();
+
+        let xcb_values = [
+            x::Cw::BackPixel(screen.white_pixel()),
+            x::Cw::EventMask(
+                x::EventMask::EXPOSURE | x::EventMask::STRUCTURE_NOTIFY | x::EventMask::KEY_PRESS,
+            ),
+        ];
+
+        let bounds = match options.bounds {
+            WindowBounds::Fullscreen | WindowBounds::Maximized => Bounds {
+                origin: Point::default(),
+                size: Size {
+                    width: screen.width_in_pixels() as i32,
+                    height: screen.height_in_pixels() as i32,
+                },
+            },
+            WindowBounds::Fixed(bounds) => bounds.map(|p| p.0 as i32),
+        };
+
+        xcb_connection.send_request(&x::CreateWindow {
+            depth: x::COPY_FROM_PARENT as u8,
+            wid: x_window,
+            parent: screen.root(),
+            x: bounds.origin.x as i16,
+            y: bounds.origin.y as i16,
+            width: bounds.size.width as u16,
+            height: bounds.size.height as u16,
+            border_width: 0,
+            class: x::WindowClass::InputOutput,
+            visual: screen.root_visual(),
+            value_list: &xcb_values,
+        });
+
+        if let Some(titlebar) = options.titlebar {
+            if let Some(title) = titlebar.title {
+                xcb_connection.send_request(&x::ChangeProperty {
+                    mode: x::PropMode::Replace,
+                    window: x_window,
+                    property: x::ATOM_WM_NAME,
+                    r#type: x::ATOM_STRING,
+                    data: title.as_bytes(),
+                });
+            }
+        }
+        xcb_connection
+            .send_and_check_request(&x::ChangeProperty {
+                mode: x::PropMode::Replace,
+                window: x_window,
+                property: atoms.wm_protocols,
+                r#type: x::ATOM_ATOM,
+                data: &[atoms.wm_del_window],
+            })
+            .unwrap();
+
+        xcb_connection.send_request(&x::MapWindow { window: x_window });
+        xcb_connection.flush().unwrap();
+
+        //Warning: it looks like this reported size is immediately invalidated
+        // on some platforms, followed by a "ConfigureNotify" event.
+        let gpu_extent = query_render_extent(&xcb_connection, x_window);
+
+        let raw = RawWindow {
+            connection: as_raw_xcb_connection::AsRawXcbConnection::as_raw_xcb_connection(
+                xcb_connection,
+            ) as *mut _,
+            screen_id: x_screen_index,
+            window_id: x_window.resource_id(),
+            visual_id: screen.root_visual(),
+        };
+        let gpu = Arc::new(
+            unsafe {
+                gpu::Context::init_windowed(
+                    &raw,
+                    gpu::ContextDesc {
+                        validation: cfg!(debug_assertions),
+                        capture: false,
+                    },
+                )
+            }
+            .unwrap(),
+        );
+
+        Self {
+            xcb_connection: Arc::clone(xcb_connection),
+            display: Rc::new(LinuxDisplay::new(xcb_connection, x_screen_index)),
+            raw,
+            x_window,
+            callbacks: Mutex::new(Callbacks::default()),
+            inner: Mutex::new(LinuxWindowInner {
+                bounds,
+                scale_factor: 1.0,
+                renderer: BladeRenderer::new(gpu, gpu_extent),
+            }),
+        }
+    }
+
+    pub fn destroy(&self) {
+        self.inner.lock().renderer.destroy();
+        self.xcb_connection.send_request(&x::UnmapWindow {
+            window: self.x_window,
+        });
+        self.xcb_connection.send_request(&x::DestroyWindow {
+            window: self.x_window,
+        });
+        if let Some(fun) = self.callbacks.lock().close.take() {
+            fun();
+        }
+        self.xcb_connection.flush().unwrap();
+    }
+
+    pub fn expose(&self) {
+        let mut cb = self.callbacks.lock();
+        if let Some(ref mut fun) = cb.request_frame {
+            fun();
+        }
+    }
+
+    pub fn configure(&self, bounds: Bounds<i32>) {
+        let mut resize_args = None;
+        let do_move;
+        {
+            let mut inner = self.inner.lock();
+            let old_bounds = mem::replace(&mut inner.bounds, bounds);
+            do_move = old_bounds.origin != bounds.origin;
+            let gpu_size = query_render_extent(&self.xcb_connection, self.x_window);
+            if inner.renderer.viewport_size() != gpu_size {
+                inner.renderer.resize(gpu_size);
+                resize_args = Some((inner.content_size(), inner.scale_factor));
+            }
+        }
+
+        let mut callbacks = self.callbacks.lock();
+        if let Some((content_size, scale_factor)) = resize_args {
+            if let Some(ref mut fun) = callbacks.resize {
+                fun(content_size, scale_factor)
+            }
+        }
+        if do_move {
+            if let Some(ref mut fun) = callbacks.moved {
+                fun()
+            }
+        }
+    }
+}
+
+impl PlatformWindow for LinuxWindow {
+    fn bounds(&self) -> WindowBounds {
+        WindowBounds::Fixed(self.0.inner.lock().bounds.map(|v| GlobalPixels(v as f32)))
+    }
+
+    fn content_size(&self) -> Size<Pixels> {
+        self.0.inner.lock().content_size()
+    }
+
+    fn scale_factor(&self) -> f32 {
+        self.0.inner.lock().scale_factor
+    }
+
+    //todo!(linux)
+    fn titlebar_height(&self) -> Pixels {
+        unimplemented!()
+    }
+
+    //todo!(linux)
+    fn appearance(&self) -> WindowAppearance {
+        unimplemented!()
+    }
+
+    fn display(&self) -> Rc<dyn PlatformDisplay> {
+        Rc::clone(&self.0.display)
+    }
+
+    //todo!(linux)
+    fn mouse_position(&self) -> Point<Pixels> {
+        Point::default()
+    }
+
+    //todo!(linux)
+    fn modifiers(&self) -> crate::Modifiers {
+        crate::Modifiers::default()
+    }
+
+    fn as_any_mut(&mut self) -> &mut dyn std::any::Any {
+        self
+    }
+
+    //todo!(linux)
+    fn set_input_handler(&mut self, input_handler: PlatformInputHandler) {}
+
+    //todo!(linux)
+    fn take_input_handler(&mut self) -> Option<PlatformInputHandler> {
+        None
+    }
+
+    //todo!(linux)
+    fn prompt(
+        &self,
+        _level: crate::PromptLevel,
+        _msg: &str,
+        _detail: Option<&str>,
+        _answers: &[&str],
+    ) -> futures::channel::oneshot::Receiver<usize> {
+        unimplemented!()
+    }
+
+    //todo!(linux)
+    fn activate(&self) {}
+
+    //todo!(linux)
+    fn set_title(&mut self, title: &str) {}
+
+    //todo!(linux)
+    fn set_edited(&mut self, edited: bool) {}
+
+    //todo!(linux), this corresponds to `orderFrontCharacterPalette` on macOS,
+    // but it looks like the equivalent for Linux is GTK specific:
+    //
+    // https://docs.gtk.org/gtk3/signal.Entry.insert-emoji.html
+    //
+    // This API might need to change, or we might need to build an emoji picker into GPUI
+    fn show_character_palette(&self) {
+        unimplemented!()
+    }
+
+    //todo!(linux)
+    fn minimize(&self) {
+        unimplemented!()
+    }
+
+    //todo!(linux)
+    fn zoom(&self) {
+        unimplemented!()
+    }
+
+    //todo!(linux)
+    fn toggle_full_screen(&self) {
+        unimplemented!()
+    }
+
+    fn on_request_frame(&self, callback: Box<dyn FnMut()>) {
+        self.0.callbacks.lock().request_frame = Some(callback);
+    }
+
+    fn on_input(&self, callback: Box<dyn FnMut(crate::PlatformInput) -> bool>) {
+        self.0.callbacks.lock().input = Some(callback);
+    }
+
+    fn on_active_status_change(&self, callback: Box<dyn FnMut(bool)>) {
+        self.0.callbacks.lock().active_status_change = Some(callback);
+    }
+
+    fn on_resize(&self, callback: Box<dyn FnMut(Size<Pixels>, f32)>) {
+        self.0.callbacks.lock().resize = Some(callback);
+    }
+
+    fn on_fullscreen(&self, callback: Box<dyn FnMut(bool)>) {
+        self.0.callbacks.lock().fullscreen = Some(callback);
+    }
+
+    fn on_moved(&self, callback: Box<dyn FnMut()>) {
+        self.0.callbacks.lock().moved = Some(callback);
+    }
+
+    fn on_should_close(&self, callback: Box<dyn FnMut() -> bool>) {
+        self.0.callbacks.lock().should_close = Some(callback);
+    }
+
+    fn on_close(&self, callback: Box<dyn FnOnce()>) {
+        self.0.callbacks.lock().close = Some(callback);
+    }
+
+    fn on_appearance_changed(&self, callback: Box<dyn FnMut()>) {
+        self.0.callbacks.lock().appearance_changed = Some(callback);
+    }
+
+    //todo!(linux)
+    fn is_topmost_for_position(&self, _position: crate::Point<Pixels>) -> bool {
+        unimplemented!()
+    }
+
+    //todo!(linux)
+    fn invalidate(&self) {}
+
+    fn draw(&self, scene: &crate::Scene) {
+        let mut inner = self.0.inner.lock();
+        inner.renderer.draw(scene);
+    }
+
+    fn sprite_atlas(&self) -> sync::Arc<dyn crate::PlatformAtlas> {
+        let inner = self.0.inner.lock();
+        inner.renderer.atlas().clone()
+    }
+}

crates/gpui/src/platform/test.rs 🔗

@@ -1,9 +1,12 @@
 mod dispatcher;
 mod display;
 mod platform;
+mod text_system;
 mod window;
 
 pub(crate) use dispatcher::*;
 pub(crate) use display::*;
 pub(crate) use platform::*;
+#[cfg(not(target_os = "macos"))]
+pub(crate) use text_system::*;
 pub(crate) use window::*;

crates/gpui/src/platform/test/platform.rs 🔗

@@ -120,7 +120,11 @@ impl Platform for TestPlatform {
     }
 
     fn text_system(&self) -> Arc<dyn PlatformTextSystem> {
-        Arc::new(crate::platform::mac::MacTextSystem::new())
+        #[cfg(target_os = "linux")]
+        return Arc::new(crate::platform::test::TestTextSystem {});
+
+        #[cfg(target_os = "macos")]
+        return Arc::new(crate::platform::mac::MacTextSystem::new());
     }
 
     fn run(&self, _on_finish_launching: Box<dyn FnOnce()>) {

crates/gpui/src/platform/test/text_system.rs 🔗

@@ -0,0 +1,59 @@
+use crate::{
+    Bounds, DevicePixels, Font, FontId, FontMetrics, FontRun, GlyphId, LineLayout, Pixels,
+    PlatformTextSystem, RenderGlyphParams, Size,
+};
+use anyhow::Result;
+use std::borrow::Cow;
+
+pub(crate) struct TestTextSystem {}
+
+//todo!(linux)
+#[allow(unused)]
+impl PlatformTextSystem for TestTextSystem {
+    fn add_fonts(&self, fonts: Vec<Cow<'static, [u8]>>) -> Result<()> {
+        unimplemented!()
+    }
+    fn all_font_names(&self) -> Vec<String> {
+        unimplemented!()
+    }
+    fn all_font_families(&self) -> Vec<String> {
+        unimplemented!()
+    }
+    fn font_id(&self, descriptor: &Font) -> Result<FontId> {
+        unimplemented!()
+    }
+    fn font_metrics(&self, font_id: FontId) -> FontMetrics {
+        unimplemented!()
+    }
+    fn typographic_bounds(&self, font_id: FontId, glyph_id: GlyphId) -> Result<Bounds<f32>> {
+        unimplemented!()
+    }
+    fn advance(&self, font_id: FontId, glyph_id: GlyphId) -> Result<Size<f32>> {
+        unimplemented!()
+    }
+    fn glyph_for_char(&self, font_id: FontId, ch: char) -> Option<GlyphId> {
+        unimplemented!()
+    }
+    fn glyph_raster_bounds(&self, params: &RenderGlyphParams) -> Result<Bounds<DevicePixels>> {
+        unimplemented!()
+    }
+    fn rasterize_glyph(
+        &self,
+        params: &RenderGlyphParams,
+        raster_bounds: Bounds<DevicePixels>,
+    ) -> Result<(Size<DevicePixels>, Vec<u8>)> {
+        unimplemented!()
+    }
+    fn layout_line(&self, text: &str, font_size: Pixels, runs: &[FontRun]) -> LineLayout {
+        unimplemented!()
+    }
+    fn wrap_line(
+        &self,
+        text: &str,
+        font_id: FontId,
+        font_size: Pixels,
+        width: Pixels,
+    ) -> Vec<usize> {
+        unimplemented!()
+    }
+}

crates/gpui/src/platform/test/window.rs 🔗

@@ -340,6 +340,7 @@ impl PlatformAtlas for TestAtlas {
                     kind: crate::AtlasTextureKind::Path,
                 },
                 tile_id: TileId(tile_id),
+                padding: 0,
                 bounds: crate::Bounds {
                     origin: Point::default(),
                     size,

crates/gpui/src/scene.rs 🔗

@@ -543,8 +543,8 @@ pub(crate) struct Underline {
     pub order: DrawOrder,
     pub bounds: Bounds<ScaledPixels>,
     pub content_mask: ContentMask<ScaledPixels>,
-    pub thickness: ScaledPixels,
     pub color: Hsla,
+    pub thickness: ScaledPixels,
     pub wavy: bool,
 }
 
@@ -577,6 +577,7 @@ pub(crate) struct Shadow {
     pub content_mask: ContentMask<ScaledPixels>,
     pub color: Hsla,
     pub blur_radius: ScaledPixels,
+    pub pad: u32, // align to 8 bytes
 }
 
 impl Ord for Shadow {
@@ -641,6 +642,7 @@ pub(crate) struct PolychromeSprite {
     pub corner_radii: Corners<ScaledPixels>,
     pub tile: AtlasTile,
     pub grayscale: bool,
+    pub pad: u32, // align to 8 bytes
 }
 
 impl Ord for PolychromeSprite {
@@ -671,6 +673,7 @@ pub(crate) struct Surface {
     pub order: DrawOrder,
     pub bounds: Bounds<ScaledPixels>,
     pub content_mask: ContentMask<ScaledPixels>,
+    #[cfg(target_os = "macos")]
     pub image_buffer: media::core_video::CVImageBuffer,
 }
 

crates/gpui/src/window/element_cx.rs 🔗

@@ -23,6 +23,7 @@ use std::{
 use anyhow::Result;
 use collections::{FxHashMap, FxHashSet};
 use derive_more::{Deref, DerefMut};
+#[cfg(target_os = "macos")]
 use media::core_video::CVImageBuffer;
 use smallvec::SmallVec;
 use util::post_inc;
@@ -34,8 +35,8 @@ use crate::{
     InputHandler, IsZero, KeyContext, KeyEvent, LayoutId, MonochromeSprite, MouseEvent, PaintQuad,
     Path, Pixels, PlatformInputHandler, Point, PolychromeSprite, Quad, RenderGlyphParams,
     RenderImageParams, RenderSvgParams, Scene, Shadow, SharedString, Size, StackingContext,
-    StackingOrder, StrikethroughStyle, Style, Surface, TextStyleRefinement, Underline,
-    UnderlineStyle, Window, WindowContext, SUBPIXEL_VARIANTS,
+    StackingOrder, StrikethroughStyle, Style, TextStyleRefinement, Underline, UnderlineStyle,
+    Window, WindowContext, SUBPIXEL_VARIANTS,
 };
 
 type AnyMouseListener = Box<dyn FnMut(&dyn Any, DispatchPhase, &mut ElementContext) + 'static>;
@@ -676,6 +677,7 @@ impl<'a> ElementContext<'a> {
                     corner_radii: corner_radii.scale(scale_factor),
                     color: shadow.color,
                     blur_radius: shadow.blur_radius.scale(scale_factor),
+                    pad: 0,
                 },
             );
         }
@@ -751,8 +753,8 @@ impl<'a> ElementContext<'a> {
                 order: 0,
                 bounds: bounds.scale(scale_factor),
                 content_mask: content_mask.scale(scale_factor),
-                thickness: style.thickness.scale(scale_factor),
                 color: style.color.unwrap_or_default(),
+                thickness: style.thickness.scale(scale_factor),
                 wavy: style.wavy,
             },
         );
@@ -904,6 +906,7 @@ impl<'a> ElementContext<'a> {
                     content_mask,
                     tile,
                     grayscale: false,
+                    pad: 0,
                 },
             );
         }
@@ -988,12 +991,14 @@ impl<'a> ElementContext<'a> {
                 corner_radii,
                 tile,
                 grayscale,
+                pad: 0,
             },
         );
         Ok(())
     }
 
     /// Paint a surface into the scene for the next frame at the current z-index.
+    #[cfg(target_os = "macos")]
     pub fn paint_surface(&mut self, bounds: Bounds<Pixels>, image_buffer: CVImageBuffer) {
         let scale_factor = self.scale_factor();
         let bounds = bounds.scale(scale_factor);
@@ -1002,7 +1007,7 @@ impl<'a> ElementContext<'a> {
         let window = &mut *self.window;
         window.next_frame.scene.insert(
             &window.next_frame.z_index_stack,
-            Surface {
+            crate::Surface {
                 view_id: view_id.into(),
                 layer_id: 0,
                 order: 0,

crates/live_kit_client/Cargo.toml 🔗

@@ -66,6 +66,13 @@ serde_derive.workspace = true
 sha2 = "0.10"
 simplelog = "0.9"
 
+[target.'cfg(target_os = "macos")'.dev-dependencies]
+cocoa = "0.25"
+core-foundation = "0.9.3"
+core-graphics = "0.22.3"
+foreign-types = "0.3"
+objc = "0.2"
+
 [build-dependencies]
 serde.workspace = true
 serde_derive.workspace = true

crates/live_kit_client/src/test.rs 🔗

@@ -3,10 +3,9 @@ use anyhow::{anyhow, Context, Result};
 use async_trait::async_trait;
 use collections::{BTreeMap, HashMap, HashSet};
 use futures::Stream;
-use gpui::BackgroundExecutor;
+use gpui::{BackgroundExecutor, ImageSource};
 use live_kit_server::{proto, token};
-#[cfg(target_os = "macos")]
-use media::core_video::CVImageBuffer;
+
 use parking_lot::Mutex;
 use postage::watch;
 use std::{
@@ -846,8 +845,7 @@ impl Frame {
         self.height
     }
 
-    #[cfg(target_os = "macos")]
-    pub fn image(&self) -> CVImageBuffer {
+    pub fn image(&self) -> ImageSource {
         unimplemented!("you can't call this in test mode")
     }
 }

crates/media/Cargo.toml 🔗

@@ -13,10 +13,10 @@ doctest = false
 anyhow.workspace = true
 block = "0.1"
 bytes = "1.2"
-foreign-types = "0.3"
 
 [target.'cfg(target_os = "macos")'.dependencies]
 core-foundation = "0.9.3"
+foreign-types = "0.3"
 metal = "0.21.0"
 objc = "0.2"
 

crates/media/src/media.rs 🔗

@@ -8,6 +8,7 @@ use core_foundation::{
     base::{CFTypeID, TCFType},
     declare_TCFType, impl_CFTypeDescription, impl_TCFType,
 };
+#[cfg(target_os = "macos")]
 use std::ffi::c_void;
 
 #[cfg(target_os = "macos")]

crates/project/src/terminals.rs 🔗

@@ -7,8 +7,8 @@ use terminal::{
     Terminal, TerminalBuilder,
 };
 
-#[cfg(target_os = "macos")]
-use std::os::unix::ffi::OsStrExt;
+// #[cfg(target_os = "macos")]
+// use std::os::unix::ffi::OsStrExt;
 
 pub struct Terminals {
     pub(crate) local_handles: Vec<WeakModel<terminal::Terminal>>,
@@ -124,7 +124,7 @@ impl Project {
             // Paths are not strings so we need to jump through some hoops to format the command without `format!`
             let mut command = Vec::from(activate_command.as_bytes());
             command.push(b' ');
-            command.extend_from_slice(activate_script.as_os_str().as_bytes());
+            command.extend_from_slice(activate_script.as_os_str().as_encoded_bytes());
             command.push(b'\n');
 
             terminal_handle.update(cx, |this, _| this.input_bytes(command));

crates/util/src/paths.rs 🔗

@@ -9,18 +9,59 @@ use serde::{Deserialize, Serialize};
 lazy_static::lazy_static! {
     pub static ref HOME: PathBuf = dirs::home_dir().expect("failed to determine home directory");
     pub static ref CONFIG_DIR: PathBuf = HOME.join(".config").join("zed");
-    pub static ref CONVERSATIONS_DIR: PathBuf = HOME.join(".config/zed/conversations");
-    pub static ref EMBEDDINGS_DIR: PathBuf = HOME.join(".config/zed/embeddings");
-    pub static ref THEMES_DIR: PathBuf = HOME.join(".config/zed/themes");
-    pub static ref LOGS_DIR: PathBuf = HOME.join("Library/Logs/Zed");
-    pub static ref SUPPORT_DIR: PathBuf = HOME.join("Library/Application Support/Zed");
-    pub static ref EXTENSIONS_DIR: PathBuf = HOME.join("Library/Application Support/Zed/extensions");
-    pub static ref LANGUAGES_DIR: PathBuf = HOME.join("Library/Application Support/Zed/languages");
-    pub static ref COPILOT_DIR: PathBuf = HOME.join("Library/Application Support/Zed/copilot");
-    pub static ref DEFAULT_PRETTIER_DIR: PathBuf = HOME.join("Library/Application Support/Zed/prettier");
-    pub static ref DB_DIR: PathBuf = HOME.join("Library/Application Support/Zed/db");
-    pub static ref CRASHES_DIR: PathBuf = HOME.join("Library/Logs/DiagnosticReports");
-    pub static ref CRASHES_RETIRED_DIR: PathBuf = HOME.join("Library/Logs/DiagnosticReports/Retired");
+    pub static ref CONVERSATIONS_DIR: PathBuf = CONFIG_DIR.join("conversations");
+    pub static ref EMBEDDINGS_DIR: PathBuf = CONFIG_DIR.join("embeddings");
+    pub static ref THEMES_DIR: PathBuf = CONFIG_DIR.join("themes");
+    pub static ref LOGS_DIR: PathBuf = if cfg!(target_os="macos") {
+        HOME.join("Library/Logs/Zed")
+    } else {
+        CONFIG_DIR.join("logs")
+    };
+    pub static ref SUPPORT_DIR: PathBuf = if cfg!(target_os="macos") {
+        HOME.join("Library/Application Support/Zed")
+    } else {
+        CONFIG_DIR.join("support")
+    };
+    pub static ref EXTENSIONS_DIR: PathBuf = if cfg!(target_os="macos") {
+        HOME.join("Library/Application Support/Zed")
+    } else {
+        CONFIG_DIR.join("extensions")
+    };
+    pub static ref PLUGINS_DIR: PathBuf = if cfg!(target_os="macos") {
+        HOME.join("Library/Application Support/Zed/plugins")
+    } else {
+        CONFIG_DIR.join("plugins")
+    };
+    pub static ref LANGUAGES_DIR: PathBuf = if cfg!(target_os="macos") {
+        HOME.join("Library/Application Support/Zed/languages")
+    } else {
+        CONFIG_DIR.join("languages")
+    };
+    pub static ref COPILOT_DIR: PathBuf = if cfg!(target_os="macos") {
+        HOME.join("Library/Application Support/Zed/copilot")
+    } else {
+        CONFIG_DIR.join("copilot")
+    };
+    pub static ref DEFAULT_PRETTIER_DIR: PathBuf = if cfg!(target_os="macos") {
+        HOME.join("Library/Application Support/Zed/prettier")
+    } else {
+        CONFIG_DIR.join("prettier")
+    };
+    pub static ref DB_DIR: PathBuf = if cfg!(target_os="macos") {
+        HOME.join("Library/Application Support/Zed/db")
+    } else {
+        CONFIG_DIR.join("db")
+    };
+    pub static ref CRASHES_DIR: PathBuf = if cfg!(target_os="macos") {
+        HOME.join("Library/Logs/DiagnosticReports")
+    } else {
+        CONFIG_DIR.join("crashes")
+    };
+    pub static ref CRASHES_RETIRED_DIR: PathBuf = if cfg!(target_os="macos") {
+        HOME.join("Library/Logs/DiagnosticReports/Retired")
+    } else {
+        CRASHES_DIR.join("retired")
+    };
     pub static ref SETTINGS: PathBuf = CONFIG_DIR.join("settings.json");
     pub static ref KEYMAP: PathBuf = CONFIG_DIR.join("keymap.json");
     pub static ref LAST_USERNAME: PathBuf = CONFIG_DIR.join("last-username.txt");

crates/zed/build.rs 🔗

@@ -1,25 +1,27 @@
 use std::process::Command;
 
 fn main() {
-    println!("cargo:rustc-env=MACOSX_DEPLOYMENT_TARGET=10.15.7");
-
-    println!("cargo:rerun-if-env-changed=ZED_BUNDLE");
-    if std::env::var("ZED_BUNDLE").ok().as_deref() == Some("true") {
-        // Find WebRTC.framework in the Frameworks folder when running as part of an application bundle.
-        println!("cargo:rustc-link-arg=-Wl,-rpath,@executable_path/../Frameworks");
-    } else {
-        // Find WebRTC.framework as a sibling of the executable when running outside of an application bundle.
-        println!("cargo:rustc-link-arg=-Wl,-rpath,@executable_path");
-    }
+    if cfg!(target_os = "macos") {
+        println!("cargo:rustc-env=MACOSX_DEPLOYMENT_TARGET=10.15.7");
+
+        println!("cargo:rerun-if-env-changed=ZED_BUNDLE");
+        if std::env::var("ZED_BUNDLE").ok().as_deref() == Some("true") {
+            // Find WebRTC.framework in the Frameworks folder when running as part of an application bundle.
+            println!("cargo:rustc-link-arg=-Wl,-rpath,@executable_path/../Frameworks");
+        } else {
+            // Find WebRTC.framework as a sibling of the executable when running outside of an application bundle.
+            println!("cargo:rustc-link-arg=-Wl,-rpath,@executable_path");
+        }
 
-    // Weakly link ReplayKit to ensure Zed can be used on macOS 10.15+.
-    println!("cargo:rustc-link-arg=-Wl,-weak_framework,ReplayKit");
+        // Weakly link ReplayKit to ensure Zed can be used on macOS 10.15+.
+        println!("cargo:rustc-link-arg=-Wl,-weak_framework,ReplayKit");
 
-    // Seems to be required to enable Swift concurrency
-    println!("cargo:rustc-link-arg=-Wl,-rpath,/usr/lib/swift");
+        // Seems to be required to enable Swift concurrency
+        println!("cargo:rustc-link-arg=-Wl,-rpath,/usr/lib/swift");
 
-    // Register exported Objective-C selectors, protocols, etc
-    println!("cargo:rustc-link-arg=-Wl,-ObjC");
+        // Register exported Objective-C selectors, protocols, etc
+        println!("cargo:rustc-link-arg=-Wl,-ObjC");
+    }
 
     // Populate git sha environment variable if git is available
     println!("cargo:rerun-if-changed=../../.git/logs/HEAD");

crates/zed/src/app_menus.rs 🔗

@@ -1,6 +1,5 @@
 use gpui::{Menu, MenuItem, OsAction};
 
-#[cfg(target_os = "macos")]
 pub fn app_menus() -> Vec<Menu<'static>> {
     use zed_actions::Quit;
 

crates/zed/src/languages.rs 🔗

@@ -264,6 +264,9 @@ pub fn init(
         ],
     );
 
+    // Produces a link error on linux due to duplicated `state_new` symbol
+    // todo!(linux): Restore purescript
+    #[cfg(not(target_os = "linux"))]
     language(
         "purescript",
         vec![Arc::new(purescript::PurescriptLspAdapter::new(

crates/zed/src/main.rs 🔗

@@ -11,6 +11,7 @@ use db::kvp::KEY_VALUE_STORE;
 use editor::Editor;
 use env_logger::Builder;
 use fs::RealFs;
+#[cfg(target_os = "macos")]
 use fsevent::StreamFlags;
 use futures::StreamExt;
 use gpui::{App, AppContext, AsyncAppContext, Context, SemanticVersion, Task};
@@ -176,6 +177,7 @@ fn main() {
         extension::init(fs.clone(), languages.clone(), ThemeRegistry::global(cx), cx);
 
         load_user_themes_in_background(fs.clone(), cx);
+        #[cfg(target_os = "macos")]
         watch_themes(fs.clone(), cx);
 
         cx.spawn(|_| watch_languages(fs.clone(), languages.clone()))
@@ -258,6 +260,8 @@ fn main() {
         initialize_workspace(app_state.clone(), cx);
 
         if stdout_is_a_pty() {
+            //todo!(linux): unblock this
+            #[cfg(not(target_os = "linux"))]
             upload_panics_and_crashes(http.clone(), cx);
             cx.activate(true);
             let urls = collect_url_args();
@@ -931,7 +935,9 @@ fn load_user_themes_in_background(fs: Arc<dyn fs::Fs>, cx: &mut AppContext) {
     .detach_and_log_err(cx);
 }
 
+//todo!(linux): Port fsevents to linux
 /// Spawns a background task to watch the themes directory for changes.
+#[cfg(target_os = "macos")]
 fn watch_themes(fs: Arc<dyn fs::Fs>, cx: &mut AppContext) {
     cx.spawn(|cx| async move {
         let mut events = fs

rust-toolchain.toml 🔗

@@ -2,4 +2,4 @@
 channel = "1.75"
 profile = "minimal"
 components = [ "rustfmt", "clippy" ]
-targets = [ "x86_64-apple-darwin", "aarch64-apple-darwin", "wasm32-wasi" ]
+targets = [ "x86_64-apple-darwin", "aarch64-apple-darwin", "x86_64-unknown-linux-gnu", "wasm32-wasi" ]

script/linux 🔗

@@ -1,38 +1,61 @@
-#!/usr/bin/env bash
+#!/usr/bin/bash -e
 
 # if not on Linux, do nothing
 [[ $(uname) == "Linux" ]] || exit 0
 
+# Copy assets to the user's home directory if they don't exist
+mkdir -p "$HOME/.config/zed"
+
+mkdir -p "$HOME/.config/zed/plugins"
+
+mkdir -p "$HOME/.config/zed/themes"
+cp -ruL ./assets/themes/*/*.json "$HOME/.config/zed/themes"
+
+test -f "$HOME/.config/zed/settings.json" ||
+  cp -uL ./assets/settings/initial_user_settings.json "$HOME/.config/zed/settings.json"
+
+test -f "$HOME/.config/zed/keymap.json" ||
+  cp -uL ./assets/keymaps/default.json "$HOME/.config/zed/keymap.json"
+
 # if sudo is not installed, define an empty alias
 maysudo=$(command -v sudo || true)
 export maysudo
 
 # Ubuntu, Debian, etc.
+# https://packages.ubuntu.com/
 apt=$(command -v apt-get || true)
-deps=(
-  libasound2-dev
-)
 if [[ -n $apt ]]; then
+  deps=(
+    libasound2-dev
+    libfontconfig-dev
+    vulkan-validationlayers*
+  )
   $maysudo "$apt" install -y "${deps[@]}"
   exit 0
 fi
 
 # Fedora, CentOS, RHEL, etc.
+# https://packages.fedoraproject.org/
 dnf=$(command -v dnf || true)
-deps=(
-  alsa-lib-devel
-)
 if [[ -n $dnf ]]; then
+  deps=(
+    alsa-lib-devel
+    fontconfig-devel
+    vulkan-validation-layers
+  )
   $maysudo "$dnf" install -y "${deps[@]}"
   exit 0
 fi
 
 # Arch, Manjaro, etc.
+# https://archlinux.org/packages
 pacman=$(command -v pacman || true)
-deps=(
-  alsa-lib
-)
 if [[ -n $pacman ]]; then
+  deps=(
+    alsa-lib
+    fontconfig
+    vulkan-validation-layers
+  )
   $maysudo "$pacman" -S --noconfirm "${deps[@]}"
   exit 0
 fi