1 files changed, 257 insertions, 0 deletions
diff --git a/adapters/fparkan-platform-winit/src/lib.rs b/adapters/fparkan-platform-winit/src/lib.rs
new file mode 100644
index 0000000..ec30908
--- /dev/null
+++ b/adapters/fparkan-platform-winit/src/lib.rs
@@ -0,0 +1,257 @@
+#![forbid(unsafe_code)]
+//! Minimal `winit`-backed platform adapter shim.
+
+use fparkan_platform::{
+    EventSource, MonotonicClock, MonotonicInstant, PlatformEvent, PlatformError, PhysicalSize,
+    RenderRequest, WindowHandle, WindowPort,
+};
+use winit::event::{MouseButton, WindowEvent};
+use winit::event_loop::Event;
+use std::collections::VecDeque;
+use std::sync::atomic::{AtomicU64, Ordering};
+use std::time::{SystemTime, UNIX_EPOCH};
+use winit::window::Window;
+
+static NEXT_WINDOW_HANDLE_ID: AtomicU64 = AtomicU64::new(1);
+
+fn next_window_id() -> u64 {
+    NEXT_WINDOW_HANDLE_ID.fetch_add(1, Ordering::Relaxed)
+}
+
+/// Simple monotonic clock for windowing abstractions.
+#[derive(Clone, Copy, Debug)]
+pub struct WinitClock;
+
+impl MonotonicClock for WinitClock {
+    fn now(&self) -> MonotonicInstant {
+        let duration = SystemTime::now()
+            .duration_since(UNIX_EPOCH)
+            .unwrap_or_default();
+        MonotonicInstant(duration.as_millis().try_into().unwrap_or(u64::MAX))
+    }
+}
+
+/// Event source backed by pre-buffered platform events.
+#[derive(Clone, Debug, Default)]
+pub struct WinitEventSource {
+    queue: VecDeque<PlatformEvent>,
+}
+
+impl WinitEventSource {
+    /// Creates an empty source.
+    #[must_use]
+    pub const fn new() -> Self {
+        Self {
+            queue: VecDeque::new(),
+        }
+    }
+
+    /// Pushes a synthetic event (used by tests and smoke stubs).
+    pub fn push(&mut self, event: PlatformEvent) {
+        self.queue.push_back(event);
+    }
+
+    /// Pushes a mapped native window event.
+    pub fn push_window_event(&mut self, event: &WindowEvent<'_>) {
+        match event {
+            WindowEvent::KeyboardInput { event, .. } => {
+                self.queue.push_back(PlatformEvent::KeyboardInput {
+                    scancode: event.physical_key.to_scancode().unwrap_or(0),
+                    pressed: event.state.is_pressed(),
+                });
+            }
+            WindowEvent::MouseInput { state, button, .. } => {
+                self.queue.push_back(PlatformEvent::MouseInput {
+                    button: mouse_button_code(*button),
+                    pressed: state.is_pressed(),
+                    x: 0.0,
+                    y: 0.0,
+                });
+            }
+            WindowEvent::CursorMoved { position, .. } => {
+                self.queue.push_back(PlatformEvent::CursorMoved {
+                    x: position.x,
+                    y: position.y,
+                });
+            }
+            WindowEvent::Resized(size) => {
+                self.queue.push_back(PlatformEvent::Resize {
+                    width: size.width,
+                    height: size.height,
+                });
+            }
+            WindowEvent::Focused(focused) => {
+                self.queue.push_back(PlatformEvent::FocusChanged { focused: *focused });
+            }
+            WindowEvent::ScaleFactorChanged {
+                scale_factor,
+                ..
+            } => {
+                self.queue
+                    .push_back(PlatformEvent::DpiChanged { scale: *scale_factor });
+            }
+            WindowEvent::CloseRequested => {
+                self.queue.push_back(PlatformEvent::QuitRequested);
+            }
+            _ => {}
+        }
+    }
+
+    /// Pushes events from an event loop event.
+    pub fn push_event<T>(&mut self, event: &Event<'_, T>) {
+        if let Event::WindowEvent { event, .. } = event {
+            self.push_window_event(event);
+        }
+    }
+}
+
+fn mouse_button_code(button: MouseButton) -> u16 {
+    match button {
+        MouseButton::Left => 0,
+        MouseButton::Right => 1,
+        MouseButton::Middle => 2,
+        MouseButton::Back => 3,
+        MouseButton::Forward => 4,
+        MouseButton::Other(index) => 100 + u16::try_from(index).unwrap_or(0),
+    }
+}
+
+impl EventSource for WinitEventSource {
+    fn poll(&mut self, out: &mut Vec<PlatformEvent>) -> Result<(), PlatformError> {
+        while let Some(event) = self.queue.pop_front() {
+            out.push(event);
+        }
+        Ok(())
+    }
+}
+
+/// Minimal window view over a `winit` window.
+#[derive(Clone, Debug)]
+pub struct WinitWindow {
+    handle: WindowHandle,
+    width: u32,
+    height: u32,
+    scale: f64,
+    focused: bool,
+    minimized: bool,
+    occluded: bool,
+}
+
+impl WinitWindow {
+    /// Builds a stable descriptor from a `winit` window.
+    #[must_use]
+    pub fn from_window(window: &Window) -> Self {
+        let scale = window.scale_factor();
+        let size = window.inner_size();
+        Self {
+            handle: WindowHandle {
+                id: next_window_id(),
+            },
+            width: size.width,
+            height: size.height,
+            scale,
+            focused: true,
+            minimized: false,
+            occluded: false,
+        }
+    }
+
+    /// Returns conservative defaults if a native window is not available yet.
+    #[must_use]
+    pub fn synthetic(width: u32, height: u32) -> Self {
+        Self {
+            handle: WindowHandle {
+                id: next_window_id(),
+            },
+            width,
+            height,
+            scale: 1.0,
+            focused: true,
+            minimized: false,
+            occluded: false,
+        }
+    }
+
+    /// Returns requested default render profile for integration points.
+    #[must_use]
+    pub const fn default_render_request() -> RenderRequest {
+        RenderRequest::conservative()
+    }
+}
+
+impl WindowPort for WinitWindow {
+    fn drawable_size(&self) -> PhysicalSize {
+        PhysicalSize {
+            width: self.width,
+            height: self.height,
+        }
+    }
+
+    fn dpi_scale(&self) -> f64 {
+        self.scale
+    }
+
+    fn has_focus(&self) -> bool {
+        self.focused
+    }
+
+    fn is_minimized(&self) -> bool {
+        self.minimized
+    }
+
+    fn is_occluded(&self) -> bool {
+        self.occluded
+    }
+
+    fn handle(&self) -> WindowHandle {
+        self.handle
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn event_source_buffers_synthetic_events() -> Result<(), PlatformError> {
+        let mut source = WinitEventSource::new();
+        source.push(PlatformEvent::Resumed);
+        source.push(PlatformEvent::QuitRequested);
+        let mut events = Vec::new();
+        source.poll(&mut events)?;
+        assert_eq!(events, vec![PlatformEvent::Resumed, PlatformEvent::QuitRequested]);
+        Ok(())
+    }
+
+    #[test]
+    fn window_port_reports_default_request_profile() {
+        let window = WinitWindow::synthetic(640, 360);
+        let request = WinitWindow::default_render_request();
+        assert_eq!(request.presentation, fparkan_platform::PresentationMode::Fifo);
+        assert_eq!(window.drawable_size(), PhysicalSize { width: 640, height: 360 });
+    }
+
+    #[test]
+    fn window_events_push_expected_platform_events() {
+        let mut source = WinitEventSource::new();
+        let size = winit::dpi::PhysicalSize::new(1024u32, 768u32);
+
+        source.push_window_event(&WindowEvent::Resized(size));
+        source.push_window_event(&WindowEvent::Focused(false));
+        source.push_window_event(&WindowEvent::CloseRequested);
+
+        let mut events = Vec::new();
+        source
+            .poll(&mut events)
+            .expect("platform event pump should never fail");
+
+        assert!(events.contains(&PlatformEvent::Resize {
+            width: 1024,
+            height: 768,
+        }));
+        assert!(events.contains(&PlatformEvent::FocusChanged { focused: false }));
+        assert!(events.contains(&PlatformEvent::QuitRequested));
+    }
+}
+
+// SAFETY: no unsafe usage in this crate.