core: centralize EventQueue and EventIterator declaration

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

src/Core.zig

@@ -7,9 +7,7 @@ const gpu = mach.gpu;
 const log = std.log.scoped(.mach);
 const gamemode_log = std.log.scoped(.gamemode);
 
-pub const sysgpu = @import("../main.zig").sysgpu;
+const Platform = switch (build_options.core_platform) {
-
-pub const Platform = switch (build_options.core_platform) {
     .wasm => @panic("TODO: support mach.Core WASM platform"),
     .windows => @import("core/Windows.zig"),
     .darwin => @import("core/Darwin.zig"),
@@ -25,6 +23,16 @@ pub const supports_non_blocking = switch (build_options.core_platform) {
     .null => true,
 };
 
+pub const EventQueue = std.fifo.LinearFifo(Event, .Dynamic);
+
+pub const EventIterator = struct {
+    queue: *EventQueue,
+
+    pub fn next(self: *EventIterator) ?Event {
+        return self.queue.readItem();
+    }
+};
+
 /// Set this to true if you intend to drive the main loop yourself.
 ///
 /// A panic will occur if `supports_non_blocking == false` for the platform.
@@ -148,14 +156,6 @@ surface: *gpu.Surface,
 swap_chain: *gpu.SwapChain,
 descriptor: gpu.SwapChain.Descriptor,
 
-pub const EventIterator = struct {
-    platform: Platform.EventIterator,
-
-    pub inline fn next(iter: *EventIterator) ?Event {
-        return iter.platform.next();
-    }
-};
-
 // TODO: this needs to be removed.
 pub const InitOptions = struct {
     allocator: std.mem.Allocator,

src/core/Darwin.zig

@@ -19,21 +19,12 @@ const objc = @import("objc");
 
 const log = std.log.scoped(.mach);
 
-const EventQueue = std.fifo.LinearFifo(Event, .Dynamic);
-pub const EventIterator = struct {
-    queue: *EventQueue,
-
-    pub inline fn next(self: *EventIterator) ?Event {
-        return self.queue.readItem();
-    }
-};
-
 pub const Darwin = @This();
 
 allocator: std.mem.Allocator,
 core: *Core,
 
-events: EventQueue,
+events: Core.EventQueue,
 input_state: Core.InputState,
 // modifiers: KeyMods,
 
@@ -148,8 +139,8 @@ pub fn update(_: *Darwin) !void {
 }
 
 // May be called from any thread.
-pub inline fn pollEvents(n: *Darwin) EventIterator {
+pub inline fn pollEvents(n: *Darwin) Core.EventIterator {
-    return EventIterator{ .queue = &n.events };
+    return .{ .queue = &n.events };
 }
 
 // May be called from any thread.

src/core/Null.zig

@@ -21,21 +21,12 @@ const KeyMods = Core.KeyMods;
 
 const log = std.log.scoped(.mach);
 
-const EventQueue = std.fifo.LinearFifo(Event, .Dynamic);
-pub const EventIterator = struct {
-    queue: *EventQueue,
-
-    pub inline fn next(self: *EventIterator) ?Event {
-        return self.queue.readItem();
-    }
-};
-
 pub const Null = @This();
 
 allocator: std.mem.Allocator,
 core: *Core,
 
-events: EventQueue,
+events: Core.EventQueue,
 input_state: Core.InputState,
 modifiers: KeyMods,
 
@@ -65,8 +56,8 @@ pub fn update(_: *Null) !void {
 }
 
 // May be called from any thread.
-pub inline fn pollEvents(n: *Null) EventIterator {
+pub inline fn pollEvents(n: *Null) Core.EventIterator {
-    return EventIterator{ .queue = &n.events };
+    return .{ .queue = &n.events };
 }
 
 // May be called from any thread.

src/core/Windows.zig

@@ -151,14 +151,6 @@ pub fn update(self: *Win32) !void {
     }
 }
 
-pub const EventIterator = struct {
-    queue: *EventQueue,
-
-    pub fn next(self: *EventIterator) ?Event {
-        return self.queue.readItem();
-    }
-};
-
 pub fn pollEvents(self: *Win32) EventIterator {
     return .{ .queue = &self.events };
 }