Fix Clippy

This adds a new setting:

```jsonc
{
  "gpu": "discrete" // or: "integrated
}
```

On macOS, this setting will have an effect when selecting the device
with which to render windows.

On Linux, it's without an effect.

Cargo.lock

@@ -13699,6 +13699,7 @@ dependencies = [
  "release_channel",
  "repl",
  "rope",
+ "schemars",
  "search",
  "serde",
  "serde_json",

crates/collab_ui/src/collab_ui.rs

@@ -67,5 +67,6 @@ fn notification_window_options(
         app_id: Some(app_id.to_owned()),
         window_min_size: None,
         window_decorations: Some(WindowDecorations::Client),
+        gpu: None,
     }
 }

crates/gpui/examples/window_positioning.rs

@@ -58,6 +58,7 @@ fn build_window_options(display_id: DisplayId, bounds: Bounds<Pixels>) -> Window
         app_id: None,
         window_min_size: None,
         window_decorations: None,
+        gpu: None,
     }
 }
 

crates/gpui/src/platform.rs

@@ -252,6 +252,16 @@ pub enum Decorations {
     },
 }
 
+/// A type to describe which GPU to prefer.
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash, Default)]
+pub enum Gpu {
+    /// The window is rendered using the integrated (lower-power) GPU
+    #[default]
+    Integrated,
+    /// The window is rendered using the discrete GPU
+    Discrete,
+}
+
 /// What window controls this platform supports
 #[derive(Debug, Copy, Clone, Eq, PartialEq, Hash, Default)]
 pub struct WindowControls {
@@ -679,6 +689,10 @@ pub struct WindowOptions {
     /// Whether to use client or server side decorations. Wayland only
     /// Note that this may be ignored.
     pub window_decorations: Option<WindowDecorations>,
+
+    /// Whether to prefer one GPU over another. macOS only
+    /// Note that this may be ignored.
+    pub gpu: Option<Gpu>,
 }
 
 /// The variables that can be configured when creating a new window
@@ -707,6 +721,11 @@ pub(crate) struct WindowParams {
 
     #[cfg_attr(target_os = "linux", allow(dead_code))]
     pub window_min_size: Option<Size<Pixels>>,
+
+    /// Whether to prefer one GPU over another. macOS only
+    /// Note that this may be ignored.
+    #[cfg_attr(target_os = "linux", allow(dead_code))]
+    pub gpu: Option<Gpu>,
 }
 
 /// Represents the status of how a window should be opened.
@@ -757,6 +776,7 @@ impl Default for WindowOptions {
             app_id: None,
             window_min_size: None,
             window_decorations: None,
+            gpu: None,
         }
     }
 }

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

@@ -3,9 +3,9 @@
 
 use super::{BladeAtlas, PATH_TEXTURE_FORMAT};
 use crate::{
-    AtlasTextureKind, AtlasTile, Bounds, ContentMask, DevicePixels, Hsla, MonochromeSprite, Path,
-    PathId, PathVertex, PolychromeSprite, PrimitiveBatch, Quad, ScaledPixels, Scene, Shadow, Size,
-    Underline,
+    AtlasTextureKind, AtlasTile, Bounds, ContentMask, DevicePixels, Gpu, Hsla, MonochromeSprite,
+    Path, PathId, PathVertex, PolychromeSprite, PrimitiveBatch, Quad, ScaledPixels, Scene, Shadow,
+    Size, Underline,
 };
 use bytemuck::{Pod, Zeroable};
 use collections::HashMap;
@@ -32,6 +32,7 @@ pub unsafe fn new_renderer(
     native_view: *mut c_void,
     bounds: crate::Size<f32>,
     transparent: bool,
+    _gpu: Option<Gpu>,
 ) -> Renderer {
     use raw_window_handle as rwh;
     struct RawWindow {

crates/gpui/src/platform/mac/metal_renderer.rs

@@ -1,7 +1,7 @@
 use super::metal_atlas::MetalAtlas;
 use crate::{
     point, size, AtlasTextureId, AtlasTextureKind, AtlasTile, Bounds, ContentMask, DevicePixels,
-    Hsla, MonochromeSprite, Path, PathId, PathVertex, PolychromeSprite, PrimitiveBatch, Quad,
+    Gpu, Hsla, MonochromeSprite, Path, PathId, PathVertex, PolychromeSprite, PrimitiveBatch, Quad,
     ScaledPixels, Scene, Shadow, Size, Surface, Underline,
 };
 use anyhow::{anyhow, Result};
@@ -38,8 +38,9 @@ pub unsafe fn new_renderer(
     _native_view: *mut c_void,
     _bounds: crate::Size<f32>,
     _transparent: bool,
+    gpu: Option<Gpu>,
 ) -> Renderer {
-    MetalRenderer::new(context)
+    MetalRenderer::new(context, gpu)
 }
 
 pub(crate) struct InstanceBufferPool {
@@ -108,13 +109,19 @@ pub(crate) struct MetalRenderer {
 }
 
 impl MetalRenderer {
-    pub fn new(instance_buffer_pool: Arc<Mutex<InstanceBufferPool>>) -> Self {
-        // Prefer low‐power integrated GPUs on Intel Mac. On Apple
-        // Silicon, there is only ever one GPU, so this is equivalent to
-        // `metal::Device::system_default()`.
-        let mut devices = metal::Device::all();
-        devices.sort_by_key(|device| (!device.is_removable(), device.is_low_power()));
-        let Some(device) = devices.pop() else {
+    pub fn new(instance_buffer_pool: Arc<Mutex<InstanceBufferPool>>, gpu: Option<Gpu>) -> Self {
+        let device = match gpu {
+            Some(Gpu::Discrete) => metal::Device::system_default(),
+            _ => {
+                // By default, prefer low‐power integrated GPUs on Intel Mac. On Apple
+                // Silicon, there is only ever one GPU, so this is equivalent to
+                // `metal::Device::system_default()`.
+                let mut devices = metal::Device::all();
+                devices.sort_by_key(|device| (!device.is_removable(), device.is_low_power()));
+                devices.pop()
+            }
+        };
+        let Some(device) = device else {
             log::error!("unable to access a compatible graphics device");
             std::process::exit(1);
         };

crates/gpui/src/platform/mac/window.rs

@@ -505,6 +505,7 @@ impl MacWindow {
             show,
             display_id,
             window_min_size,
+            gpu,
         }: WindowParams,
         executor: ForegroundExecutor,
         renderer_context: renderer::Context,
@@ -603,6 +604,7 @@ impl MacWindow {
                     native_view as *mut _,
                     bounds.size.map(|pixels| pixels.0),
                     false,
+                    gpu,
                 ),
                 request_frame_callback: None,
                 event_callback: None,

crates/gpui/src/window.rs

@@ -645,6 +645,7 @@ impl Window {
             app_id,
             window_min_size,
             window_decorations,
+            gpu,
         } = options;
 
         let bounds = window_bounds
@@ -661,6 +662,7 @@ impl Window {
                 show,
                 display_id,
                 window_min_size,
+                gpu,
             },
         )?;
         let display_id = platform_window.display().map(|display| display.id());

crates/zed/Cargo.toml

@@ -86,6 +86,7 @@ serde.workspace = true
 serde_json.workspace = true
 settings.workspace = true
 simplelog.workspace = true
+schemars.workspace = true
 smol.workspace = true
 snippet_provider.workspace = true
 tab_switcher.workspace = true

crates/zed/src/zed.rs

@@ -1,4 +1,5 @@
 mod app_menus;
+mod gpu;
 pub mod inline_completion_registry;
 #[cfg(target_os = "linux")]
 pub(crate) mod linux_prompts;
@@ -11,6 +12,7 @@ use breadcrumbs::Breadcrumbs;
 use client::ZED_URL_SCHEME;
 use collections::VecDeque;
 use editor::{scroll::Autoscroll, Editor, MultiBuffer};
+use gpu::GpuSettings;
 use gpui::{
     actions, point, px, AppContext, AsyncAppContext, Context, FocusableView, MenuItem, PromptLevel,
     ReadGlobal, TitlebarOptions, View, ViewContext, VisualContext, WindowKind, WindowOptions,
@@ -78,6 +80,7 @@ pub fn init(cx: &mut AppContext) {
     cx.on_action(|_: &ShowAll, cx| cx.unhide_other_apps());
     cx.on_action(quit);
 
+    GpuSettings::register(cx);
     if ReleaseChannel::global(cx) == ReleaseChannel::Dev {
         cx.on_action(test_panic);
     }
@@ -115,6 +118,7 @@ pub fn build_window_options(display_uuid: Option<Uuid>, cx: &mut AppContext) ->
             width: px(360.0),
             height: px(240.0),
         }),
+        gpu: GpuSettings::get_global(cx).gpu.map(Into::into),
     }
 }
 

crates/zed/src/zed/gpu.rs

@@ -0,0 +1,46 @@
+use schemars::JsonSchema;
+use serde::{Deserialize, Serialize};
+use settings::{Settings, SettingsSources};
+
+#[derive(Copy, Clone, Debug, Default, Serialize, PartialEq, Eq, Deserialize, JsonSchema)]
+#[serde(rename_all = "lowercase")]
+pub enum Gpu {
+    Discrete,
+    #[default]
+    Integrated,
+}
+
+impl Into<gpui::Gpu> for Gpu {
+    fn into(self) -> gpui::Gpu {
+        match self {
+            Gpu::Discrete => gpui::Gpu::Discrete,
+            Gpu::Integrated => gpui::Gpu::Integrated,
+        }
+    }
+}
+
+/// Settings related to the machine's GPU and how Zed uses it.
+#[derive(Copy, Clone, Debug, Serialize, Deserialize, JsonSchema, PartialEq, Eq, Default)]
+pub struct GpuSettings {
+    /// Which GPU to prefer: discrete or integrated.
+    /// Integrated are often lower-power and thus more battery-efficient.
+    ///
+    /// Default: 0.2
+    pub gpu: Option<Gpu>,
+}
+
+impl Settings for GpuSettings {
+    const KEY: Option<&'static str> = None;
+
+    type FileContent = Option<Self>;
+
+    fn load(
+        sources: SettingsSources<Self::FileContent>,
+        _: &mut gpui::AppContext,
+    ) -> anyhow::Result<Self> {
+        if let Some(Some(user_value)) = sources.user.copied() {
+            return Ok(user_value);
+        }
+        Ok(Self::default())
+    }
+}