add stateful input component for programmatic gamepad stuff

ferretro_base/src/retro/wrapped_types.rs

@@ -93,7 +93,7 @@ impl<'a> Debug for VideoFrame<'a> {
     }
 }
 
-#[derive(Clone, Copy, Debug)]
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
 pub enum InputDeviceId {
     None(c_uint),
     Joypad(JoypadButton),

ferretro_components/src/provided/stdlib/input.rs

@@ -0,0 +1,28 @@
+use std::collections::HashMap;
+use crate::prelude::{RetroCallbacks, RetroComponent, InputDeviceId, InputIndex};
+
+#[derive(Default)]
+pub struct StatefulInputComponent {
+    states: Vec<HashMap<(InputDeviceId, InputIndex), i16>>,
+}
+
+impl StatefulInputComponent {
+    pub fn set_input(&mut self, port: u32, device: InputDeviceId, index: impl Into<Option<InputIndex>>, value: i16) {
+        while port >= self.states.len() as u32 {
+            self.states.push(Default::default());
+        }
+        let index = index.into().unwrap_or(InputIndex::Left);
+        self.states[port as usize].insert((device, index), value);
+    }
+}
+
+impl RetroComponent for StatefulInputComponent {}
+
+impl RetroCallbacks for StatefulInputComponent {
+    fn input_state(&mut self, port: u32, device: InputDeviceId, index: InputIndex) -> i16 {
+        self.states.get(port as usize)
+            .and_then(|x| x.get(&(device, index)))
+            .map(|x| *x)
+            .unwrap_or_default()
+    }
+}

ferretro_components/src/provided/stdlib/mod.rs

@@ -3,11 +3,13 @@
 
 mod camera;
 mod fps;
+mod input;
 mod logs;
 mod paths;
 
 pub use camera::CameraInfoComponent;
 pub use fps::SleepFramerateLimitComponent;
+pub use input::StatefulInputComponent;
 pub use logs::StderrCallTraceComponent;
 pub use logs::StderrLogComponent;
 pub use logs::StderrSysInfoLogComponent;