core: move linux-specific code to Linux.zig

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

src/Core.zig

@@ -6,9 +6,6 @@ const mach = @import("main.zig");
 const gpu = mach.gpu;
 const log = std.log.scoped(.mach);
 
-// TODO: move to Linux.zig
-const gamemode_log = std.log.scoped(.gamemode);
-
 // Whether or not you can drive the main loop in a non-blocking fashion, or if the underlying
 // platform must take control and drive the main loop itself.
 pub const supports_non_blocking = switch (build_options.core_platform) {
@@ -135,9 +132,6 @@ state: enum {
 } = .running,
 frame: mach.time.Frequency,
 
-// TODO: move to Linux.zig
-linux_gamemode: ?bool = null,
-
 // Might be accessed by Platform backend
 input: mach.time.Frequency,
 swap_chain_update: std.Thread.ResetEvent = .{},
@@ -278,11 +272,6 @@ fn init(core: *Mod, entities: *mach.Entities.Mod) !void {
     try core.set(state.main_window, .width, state.platform.size.width);
     try core.set(state.main_window, .height, state.platform.size.height);
 
-    // TODO: move to Linux.zig
-    if (builtin.os.tag == .linux and !options.is_app and
-        state.linux_gamemode == null and try wantGamemode(options.allocator))
-        state.linux_gamemode = initLinuxGamemode();
-
     state.frame = .{ .target = 0 };
     state.input = .{ .target = 1 };
     try state.frame.start();
@@ -362,14 +351,6 @@ pub fn deinit(entities: *mach.Entities.Mod, core: *Mod) !void {
         }
     }
 
-    // TODO: move to Linux.zig
-    if (builtin.os.tag == .linux and
-        state.linux_gamemode != null and
-        state.linux_gamemode.?)
-    {
-        deinitLinuxGamemode();
-    }
-
     state.platform.deinit();
     state.swap_chain.release();
     state.queue.release();
@@ -733,35 +714,6 @@ pub inline fn printUnhandledErrorCallback(_: void, ty: gpu.ErrorType, message: [
     std.process.exit(1);
 }
 
-// TODO: move to Linux.zig
-/// Check if gamemode should be activated
-pub fn wantGamemode(allocator: std.mem.Allocator) error{ OutOfMemory, InvalidWtf8 }!bool {
-    const use_gamemode = std.process.getEnvVarOwned(
-        allocator,
-        "MACH_USE_GAMEMODE",
-    ) catch |err| switch (err) {
-        error.EnvironmentVariableNotFound => return true,
-        else => |e| return e,
-    };
-    defer allocator.free(use_gamemode);
-
-    return !(std.ascii.eqlIgnoreCase(use_gamemode, "off") or std.ascii.eqlIgnoreCase(use_gamemode, "false"));
-}
-
-// TODO: move to Linux.zig
-pub fn initLinuxGamemode() bool {
-    mach.gamemode.start();
-    if (!mach.gamemode.isActive()) return false;
-    gamemode_log.info("gamemode: activated", .{});
-    return true;
-}
-
-// TODO: move to Linux.zig
-pub fn deinitLinuxGamemode() void {
-    mach.gamemode.stop();
-    gamemode_log.info("gamemode: deactivated", .{});
-}
-
 pub fn detectBackendType(allocator: std.mem.Allocator) !gpu.BackendType {
     const backend = std.process.getEnvVarOwned(
         allocator,

src/core/Linux.zig

@@ -17,6 +17,7 @@ const Key = Core.Key;
 const KeyMods = Core.KeyMods;
 
 const log = std.log.scoped(.mach);
+const gamemode_log = std.log.scoped(.gamemode);
 
 pub const Linux = @This();
 
@@ -33,19 +34,21 @@ headless: bool,
 refresh_rate: u32,
 size: Size,
 surface_descriptor: gpu.Surface.Descriptor,
+gamemode: ?bool = null,
 
 pub fn init(
     linux: *Linux,
     core: *Core.Mod,
     options: InitOptions,
 ) !void {
-    _ = linux;
-    _ = options;
     _ = core;
+
+    if (!options.is_app and try wantGamemode(options.allocator)) linux.gamemode = initLinuxGamemode();
     return;
 }
 
-pub fn deinit(_: *Linux) void {
+pub fn deinit(linux: *Linux) void {
+    if (linux.gamemode != null and linux.gamemode.?) deinitLinuxGamemode();
     return;
 }
 
@@ -89,6 +92,32 @@ pub fn setCursorShape(_: *Linux, _: CursorShape) void {
     return;
 }
 
+/// Check if gamemode should be activated
+pub fn wantGamemode(allocator: std.mem.Allocator) error{ OutOfMemory, InvalidWtf8 }!bool {
+    const use_gamemode = std.process.getEnvVarOwned(
+        allocator,
+        "MACH_USE_GAMEMODE",
+    ) catch |err| switch (err) {
+        error.EnvironmentVariableNotFound => return true,
+        else => |e| return e,
+    };
+    defer allocator.free(use_gamemode);
+
+    return !(std.ascii.eqlIgnoreCase(use_gamemode, "off") or std.ascii.eqlIgnoreCase(use_gamemode, "false"));
+}
+
+pub fn initLinuxGamemode() bool {
+    mach.gamemode.start();
+    if (!mach.gamemode.isActive()) return false;
+    gamemode_log.info("gamemode: activated", .{});
+    return true;
+}
+
+pub fn deinitLinuxGamemode() void {
+    mach.gamemode.stop();
+    gamemode_log.info("gamemode: deactivated", .{});
+}
+
 ///! Taken from https://github.com/glfw/glfw/blob/master/src/xkb_unicode.c
 const KeySym = c_ulong;
 const keysym_table = &[_]struct { KeySym, u21 }{