Switch to a single GPU context in Blade

Cargo.toml

@@ -355,9 +355,9 @@ async-watch = "0.3.1"
 async_zip = { version = "0.0.17", features = ["deflate", "deflate64"] }
 base64 = "0.22"
 bitflags = "2.6.0"
-blade-graphics = { git = "https://github.com/kvark/blade", rev = "e142a3a5e678eb6a13e642ad8401b1f3aa38e969" }
-blade-macros = { git = "https://github.com/kvark/blade", rev = "e142a3a5e678eb6a13e642ad8401b1f3aa38e969" }
-blade-util = { git = "https://github.com/kvark/blade", rev = "e142a3a5e678eb6a13e642ad8401b1f3aa38e969" }
+blade-graphics = { git = "https://github.com/kvark/blade", rev = "099555282605c7c4cca9e66a8f40148298347f80" }
+blade-macros = { git = "https://github.com/kvark/blade", rev = "099555282605c7c4cca9e66a8f40148298347f80" }
+blade-util = { git = "https://github.com/kvark/blade", rev = "099555282605c7c4cca9e66a8f40148298347f80" }
 blake3 = "1.5.3"
 bytes = "1.0"
 cargo_metadata = "0.19"
@@ -525,6 +525,12 @@ wasmtime-wasi = "24"
 which = "6.0.0"
 wit-component = "0.201"
 zstd = "0.11"
+# Custom metal-rs is only needed for "macos-blade" feature of GPUI
+#TODO: switch to crates once these are published:
+# - https://github.com/gfx-rs/metal-rs/pull/335
+# - https://github.com/gfx-rs/metal-rs/pull/336
+# - https://github.com/gfx-rs/metal-rs/pull/337
+metal = { git = "https://github.com/gfx-rs/metal-rs", rev = "ef768ff9d742ae6a0f4e83ddc8031264e7d460c4" }
 
 [workspace.dependencies.async-stripe]
 git = "https://github.com/zed-industries/async-stripe"

crates/gpui/Cargo.toml

@@ -136,8 +136,8 @@ font-kit = { git = "https://github.com/zed-industries/font-kit", rev = "40391b7"
 foreign-types = "0.5"
 log.workspace = true
 media.workspace = true
-metal = "0.29"
 objc = "0.2"
+metal.workspace = true
 
 [target.'cfg(any(target_os = "linux", target_os = "freebsd", target_os = "macos"))'.dependencies]
 pathfinder_geometry = "0.5"

crates/gpui/src/platform/blade.rs

@@ -1,5 +1,11 @@
+#[cfg(target_os = "macos")]
+mod apple_compat;
 mod blade_atlas;
+mod blade_context;
 mod blade_renderer;
 
+#[cfg(target_os = "macos")]
+pub(crate) use apple_compat::*;
 pub(crate) use blade_atlas::*;
+pub(crate) use blade_context::*;
 pub(crate) use blade_renderer::*;

crates/gpui/src/platform/blade/apple_compat.rs

@@ -0,0 +1,60 @@
+use super::{BladeContext, BladeRenderer, BladeSurfaceConfig};
+use blade_graphics as gpu;
+use std::{ffi::c_void, ptr::NonNull};
+
+#[derive(Clone)]
+pub struct Context {
+    inner: BladeContext,
+}
+impl Default for Context {
+    fn default() -> Self {
+        Self {
+            inner: BladeContext::new().unwrap(),
+        }
+    }
+}
+
+pub type Renderer = BladeRenderer;
+
+pub unsafe fn new_renderer(
+    context: Context,
+    _native_window: *mut c_void,
+    native_view: *mut c_void,
+    bounds: crate::Size<f32>,
+    transparent: bool,
+) -> Renderer {
+    use raw_window_handle as rwh;
+    struct RawWindow {
+        view: *mut c_void,
+    }
+
+    impl rwh::HasWindowHandle for RawWindow {
+        fn window_handle(&self) -> Result<rwh::WindowHandle, rwh::HandleError> {
+            let view = NonNull::new(self.view).unwrap();
+            let handle = rwh::AppKitWindowHandle::new(view);
+            Ok(unsafe { rwh::WindowHandle::borrow_raw(handle.into()) })
+        }
+    }
+    impl rwh::HasDisplayHandle for RawWindow {
+        fn display_handle(&self) -> Result<rwh::DisplayHandle, rwh::HandleError> {
+            let handle = rwh::AppKitDisplayHandle::new();
+            Ok(unsafe { rwh::DisplayHandle::borrow_raw(handle.into()) })
+        }
+    }
+
+    BladeRenderer::new(
+        &context.inner,
+        &RawWindow {
+            view: native_view as *mut _,
+        },
+        BladeSurfaceConfig {
+            size: gpu::Extent {
+                width: bounds.width as u32,
+                height: bounds.height as u32,
+                depth: 1,
+            },
+            transparent,
+        },
+    )
+    .unwrap()
+}

crates/gpui/src/platform/blade/blade_atlas.rs

@@ -268,7 +268,7 @@ impl BladeAtlasState {
     fn flush(&mut self, encoder: &mut gpu::CommandEncoder) {
         self.flush_initializations(encoder);
 
-        let mut transfers = encoder.transfer();
+        let mut transfers = encoder.transfer("atlas");
         for upload in self.uploads.drain(..) {
             let texture = &self.storage[upload.id];
             transfers.copy_buffer_to_texture(

crates/gpui/src/platform/blade/blade_context.rs

@@ -0,0 +1,24 @@
+use blade_graphics as gpu;
+use std::sync::Arc;
+
+#[cfg_attr(target_os = "macos", derive(Clone))]
+pub struct BladeContext {
+    pub(super) gpu: Arc<gpu::Context>,
+}
+
+impl BladeContext {
+    pub fn new() -> anyhow::Result<Self> {
+        let gpu = Arc::new(
+            unsafe {
+                gpu::Context::init(gpu::ContextDesc {
+                    presentation: true,
+                    validation: false,
+                    device_id: 0, //TODO: hook up to user settings
+                    ..Default::default()
+                })
+            }
+            .map_err(|e| anyhow::anyhow!("{:?}", e))?,
+        );
+        Ok(Self { gpu })
+    }
+}