feat: add iRacing support

Cargo.toml

@@ -28,5 +28,5 @@ dirs = "5.0"
 # Shared memory (Windows)
 [target.'cfg(windows)'.dependencies]
 memmap2 = "0.9"
-winapi = { version = "0.3", features = ["winnt", "handleapi", "memoryapi"] }
+winapi = { version = "0.3", features = ["winnt", "handleapi", "memoryapi", "errhandlingapi"] }
 

README.md

@@ -19,10 +19,11 @@ A lightweight sim racing telemetry overlay. Displays pedal inputs, steering angl
 
 ## Supported games
 
-| Game                          | Notes                                    |
-| ----------------------------- |------------------------------------------|
-| Assetto Corsa Competizione    |                                          |
-| Automobilista 2               | [Enable shared memory](#automobilista-2) |
+| Game                       | Notes                                    |
+| -------------------------- | ---------------------------------------- |
+| Assetto Corsa Competizione |                                          |
+| Automobilista 2            | [Enable shared memory](#automobilista-2) |
+| iRacing                    | Support is currently experimental        |
 
 ## Installation
 

src/plugins/ams2/ams2_plugin.rs

@@ -19,7 +19,6 @@ mod game_state {
     pub const FRONT_END: u32 = 1;
 }
 
-
 pub struct Ams2Plugin {
     #[cfg(windows)]
     mem: Option<Ams2SharedMemory>,

src/plugins/iracing/iracing_plugin.rs

@@ -0,0 +1,166 @@
+//! iRacing plugin — reads telemetry via the iRacing SDK shared memory API.
+
+use anyhow::Result;
+
+use crate::core::TelemetryData;
+use crate::plugins::{GameConfig, GamePlugin};
+
+#[cfg(windows)]
+use super::shared_memory::IracingSharedMemory;
+#[cfg(windows)]
+use crate::core::VehicleTelemetry;
+#[cfg(windows)]
+use std::f32::consts::PI;
+#[cfg(windows)]
+use tracing::{info, warn};
+
+pub struct IracingPlugin {
+    #[cfg(windows)]
+    mem: Option<IracingSharedMemory>,
+}
+
+impl IracingPlugin {
+    pub fn new() -> Self {
+        Self {
+            #[cfg(windows)]
+            mem: None,
+        }
+    }
+}
+
+impl Default for IracingPlugin {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl GamePlugin for IracingPlugin {
+    fn name(&self) -> &str {
+        "iRacing"
+    }
+
+    fn connect(&mut self) -> Result<()> {
+        #[cfg(windows)]
+        {
+            match IracingSharedMemory::open() {
+                Ok(mem) => {
+                    info!("Connected to iRacing shared memory");
+                    self.mem = Some(mem);
+                    Ok(())
+                }
+                Err(e) => {
+                    warn!("iRacing shared memory unavailable: {}", e);
+                    Err(e)
+                }
+            }
+        }
+        #[cfg(not(windows))]
+        {
+            Err(anyhow::anyhow!(
+                "iRacing plugin requires Windows (shared memory is Windows-only)"
+            ))
+        }
+    }
+
+    fn disconnect(&mut self) {
+        #[cfg(windows)]
+        {
+            self.mem = None;
+            info!("Disconnected from iRacing shared memory");
+        }
+    }
+
+    fn is_connected(&self) -> bool {
+        #[cfg(windows)]
+        {
+            // Verify the session is still active in case iRacing left the session.
+            self.mem
+                .as_ref()
+                .is_some_and(|m| unsafe { m.is_connected() })
+        }
+        #[cfg(not(windows))]
+        {
+            false
+        }
+    }
+
+    fn is_available(&self) -> bool {
+        #[cfg(windows)]
+        {
+            IracingSharedMemory::is_available()
+        }
+        #[cfg(not(windows))]
+        {
+            false
+        }
+    }
+
+    fn read_telemetry(&mut self) -> Result<Option<TelemetryData>> {
+        #[cfg(windows)]
+        {
+            let mem = match &self.mem {
+                Some(m) => m,
+                None => return Ok(None),
+            };
+
+            if !unsafe { mem.is_connected() } {
+                // Session ended — drop the mapping so connect() will rescan var headers.
+                self.mem = None;
+                return Ok(None);
+            }
+
+            let buf = unsafe { mem.current_buf_offset() };
+
+            let throttle = unsafe { mem.throttle(buf) }.clamp(0.0, 1.0);
+            let brake = unsafe { mem.brake(buf) }.clamp(0.0, 1.0);
+            // iRacing Clutch: 0 = pedal pressed (disengaged), 1 = pedal released (engaged).
+            // Invert so that our model convention (1.0 = fully pressed) is respected.
+            let clutch = (1.0 - unsafe { mem.clutch_raw(buf) }).clamp(0.0, 1.0);
+            // SteeringWheelAngle: radians, positive = CCW (left). Convert to degrees, positive = right.
+            let steering_angle = unsafe { mem.steering_wheel_angle_rad(buf) } * -(180.0 / PI);
+            let speed = unsafe { mem.speed(buf) };
+            let gear = unsafe { mem.gear(buf) };
+            let rpm = unsafe { mem.rpm(buf) };
+            let abs_active = unsafe { mem.abs_active(buf) };
+            let track_position = unsafe { mem.lap_dist_pct(buf) }.clamp(0.0, 1.0);
+
+            let vehicle = VehicleTelemetry {
+                throttle,
+                brake,
+                clutch,
+                steering_angle,
+                speed,
+                gear,
+                rpm,
+                abs_active,
+                tc_active: false,
+                track_position,
+            };
+
+            let timestamp = std::time::SystemTime::now()
+                .duration_since(std::time::UNIX_EPOCH)
+                .unwrap_or_default()
+                .as_millis() as u64;
+
+            Ok(Some(TelemetryData {
+                timestamp,
+                vehicle,
+                session: None,
+            }))
+        }
+        #[cfg(not(windows))]
+        {
+            Ok(None)
+        }
+    }
+
+    fn get_config(&self) -> GameConfig {
+        GameConfig {
+            // iRacing typically uses ±PI radians full lock, but varies by car.
+            // 450° is a reasonable UI default (same as ACC/AMS2 convention).
+            max_steering_angle: 450.0,
+            pedal_deadzone: 0.01,
+            abs_threshold: 0.01,
+        }
+    }
+}

src/plugins/iracing/mod.rs

@@ -0,0 +1,7 @@
+//! iRacing plugin (iRacing SDK shared memory API)
+
+mod iracing_plugin;
+#[cfg(windows)]
+mod shared_memory;
+
+pub use iracing_plugin::IracingPlugin;