Start making nicer types for interop with Rust

Cargo.toml

@@ -7,6 +7,7 @@ edition = "2018"
 [dependencies]
 failure = "^0.1"
 libloading = "^0.5"
+num_enum = "^0.4"
 
 [build-dependencies]
 bindgen = "^0.51" # keep an eye on https://github.com/rust-lang/rust-bindgen/issues/1541

src/libretro_convert.rs

@@ -0,0 +1,138 @@
+use std::convert::TryFrom;
+use std::os::raw::c_uint;
+use num_enum::TryFromPrimitive;
+use crate::libretro_types::*;
+
+#[derive(TryFromPrimitive)]
+#[repr(u32)]
+pub enum Region {
+    NTSC = RETRO_REGION_NTSC,
+    PAL = RETRO_REGION_PAL,
+}
+
+#[derive(TryFromPrimitive)]
+#[repr(u32)]
+pub enum DeviceType {
+    None = RETRO_DEVICE_NONE,
+    Joypad = RETRO_DEVICE_JOYPAD,
+    Mouse = RETRO_DEVICE_MOUSE,
+    Keyboard = RETRO_DEVICE_KEYBOARD,
+    LightGun = RETRO_DEVICE_LIGHTGUN,
+    Analog = RETRO_DEVICE_ANALOG,
+    Pointer = RETRO_DEVICE_POINTER,
+}
+
+#[derive(TryFromPrimitive)]
+#[repr(u32)]
+pub enum DeviceIndex {
+    Left = RETRO_DEVICE_INDEX_ANALOG_LEFT,
+    Right = RETRO_DEVICE_INDEX_ANALOG_RIGHT,
+    Button = RETRO_DEVICE_INDEX_ANALOG_BUTTON,
+}
+
+#[derive(TryFromPrimitive)]
+#[repr(u32)]
+pub enum JoypadButton {
+    B = RETRO_DEVICE_ID_JOYPAD_B,
+    Y = RETRO_DEVICE_ID_JOYPAD_Y,
+    Select = RETRO_DEVICE_ID_JOYPAD_SELECT,
+    Start = RETRO_DEVICE_ID_JOYPAD_START,
+    Up = RETRO_DEVICE_ID_JOYPAD_UP,
+    Down = RETRO_DEVICE_ID_JOYPAD_DOWN,
+    Left = RETRO_DEVICE_ID_JOYPAD_LEFT,
+    Right = RETRO_DEVICE_ID_JOYPAD_RIGHT,
+    A = RETRO_DEVICE_ID_JOYPAD_A,
+    X = RETRO_DEVICE_ID_JOYPAD_X,
+    L = RETRO_DEVICE_ID_JOYPAD_L,
+    R = RETRO_DEVICE_ID_JOYPAD_R,
+    L2 = RETRO_DEVICE_ID_JOYPAD_L2,
+    R2 = RETRO_DEVICE_ID_JOYPAD_R2,
+    L3 = RETRO_DEVICE_ID_JOYPAD_L3,
+    R3 = RETRO_DEVICE_ID_JOYPAD_R3,
+}
+
+#[derive(TryFromPrimitive)]
+#[repr(u32)]
+pub enum AnalogAxis {
+    X = RETRO_DEVICE_ID_ANALOG_X,
+    Y = RETRO_DEVICE_ID_ANALOG_Y,
+}
+
+#[derive(TryFromPrimitive)]
+#[repr(u32)]
+pub enum MouseButton {
+    X = RETRO_DEVICE_ID_MOUSE_X,
+    Y = RETRO_DEVICE_ID_MOUSE_Y,
+    Left = RETRO_DEVICE_ID_MOUSE_LEFT,
+    Right = RETRO_DEVICE_ID_MOUSE_RIGHT,
+    WheelUp = RETRO_DEVICE_ID_MOUSE_WHEELUP,
+    WheelDown = RETRO_DEVICE_ID_MOUSE_WHEELDOWN,
+    Middle = RETRO_DEVICE_ID_MOUSE_MIDDLE,
+    HorizWheelUp = RETRO_DEVICE_ID_MOUSE_HORIZ_WHEELUP,
+    HorizWheelDown = RETRO_DEVICE_ID_MOUSE_HORIZ_WHEELDOWN,
+    Button4 = RETRO_DEVICE_ID_MOUSE_BUTTON_4,
+    Button5 = RETRO_DEVICE_ID_MOUSE_BUTTON_5,
+}
+
+#[derive(TryFromPrimitive)]
+#[repr(u32)]
+pub enum LightGunButton {
+    ScreenX = RETRO_DEVICE_ID_LIGHTGUN_SCREEN_X,
+    ScreenY = RETRO_DEVICE_ID_LIGHTGUN_SCREEN_Y,
+    IsOffscreen = RETRO_DEVICE_ID_LIGHTGUN_IS_OFFSCREEN,
+    Trigger = RETRO_DEVICE_ID_LIGHTGUN_TRIGGER,
+    Reload = RETRO_DEVICE_ID_LIGHTGUN_RELOAD,
+    Start = RETRO_DEVICE_ID_LIGHTGUN_START,
+    Select = RETRO_DEVICE_ID_LIGHTGUN_SELECT,
+    AuxC = RETRO_DEVICE_ID_LIGHTGUN_AUX_C,
+    DpadUp = RETRO_DEVICE_ID_LIGHTGUN_DPAD_UP,
+    DpadDown = RETRO_DEVICE_ID_LIGHTGUN_DPAD_DOWN,
+    DpadLeft = RETRO_DEVICE_ID_LIGHTGUN_DPAD_LEFT,
+    DpadRight = RETRO_DEVICE_ID_LIGHTGUN_DPAD_RIGHT,
+    X = RETRO_DEVICE_ID_LIGHTGUN_X,
+    Y = RETRO_DEVICE_ID_LIGHTGUN_Y,
+    Cursor = RETRO_DEVICE_ID_LIGHTGUN_CURSOR,
+    Turbo = RETRO_DEVICE_ID_LIGHTGUN_TURBO,
+    Pause = RETRO_DEVICE_ID_LIGHTGUN_PAUSE,
+}
+
+#[derive(TryFromPrimitive)]
+#[repr(u32)]
+pub enum PointerStat {
+    X = RETRO_DEVICE_ID_POINTER_X,
+    Y = RETRO_DEVICE_ID_POINTER_Y,
+    Pressed = RETRO_DEVICE_ID_POINTER_PRESSED,
+}
+
+pub enum Input {
+    None(c_uint),
+    Joypad(JoypadButton),
+    Mouse(MouseButton),
+    Keyboard(c_uint),
+    LightGun(LightGunButton),
+    Analog(AnalogAxis),
+    Pointer(PointerStat),
+}
+
+impl<D> From<(D, c_uint)> for Input
+    where D: Into<DeviceType>,
+{
+    fn from(pair: (D, c_uint)) -> Self {
+        let (device, id) = pair;
+        match device.into() {
+            DeviceType::None => Input::None(id),
+            DeviceType::Joypad => Input::Joypad(JoypadButton::try_from(id).expect("Invalid joypad button ID")),
+            DeviceType::Mouse => Input::Mouse(MouseButton::try_from(id).expect("Invalid mouse button ID")),
+            DeviceType::Keyboard => Input::Keyboard(id),
+            DeviceType::LightGun => Input::LightGun(LightGunButton::try_from(id).expect("Invalid lightgun button ID")),
+            DeviceType::Analog => Input::Analog(AnalogAxis::try_from(id).expect("Invalid analog axis ID")),
+            DeviceType::Pointer => Input::Pointer(PointerStat::try_from(id).expect("Invalid pointer stat ID")),
+        }
+    }
+}
+
+type VideoRefreshCb = dyn FnMut(&[u8], c_uint, c_uint, c_uint); // buffer, width, height, pitch
+type AudioSampleCb = dyn FnMut(i16, i16); // left, right
+type AudioSampleBatchCb = dyn FnMut(&[i16]) -> usize; // pcm16le stereo samples
+type InputPollCb = dyn FnMut();
+type InputStateCb = dyn FnMut(u32, Input, DeviceIndex) -> i16; // port, device, index

src/libretro_loading.rs

@@ -1,11 +1,19 @@
+use std::convert::TryInto;
 use std::os::raw::{c_char, c_uint, c_void};
 use std::path::Path;
 
 use failure::Fallible;
+use libloading;
 
 use crate::libretro_types::*;
-use libloading;
-use std::ffi::OsStr;
+use crate::libretro_convert::*;
+
+struct StaticCallbacks {
+
+}
+impl StaticCallbacks {
+
+}
 
 pub struct LibretroApi<'a> {
     pub retro_set_environment:
@@ -90,26 +98,27 @@ impl<'a> LibretroApi<'a> {
             })
         }
     }
-    /// retro_set_environment() must be called before retro_init().
+    /// set_environment() must be called before init().
     pub fn set_environment(&self, cb: retro_environment_t) {
         unsafe { (&self.retro_set_environment)(cb) }
     }
+    /// video_refresh() must be called before run().
     pub fn set_video_refresh(&self, cb: retro_video_refresh_t) {
-        unsafe { (&self.retro_set_video_refresh)(env) }
+        unsafe { (&self.retro_set_video_refresh)(cb) }
     }
     pub fn set_audio_sample(&self, cb: retro_audio_sample_t) {
-        unsafe { (&self.retro_set_audio_sample)(env) }
+        unsafe { (&self.retro_set_audio_sample)(cb) }
     }
     pub fn set_audio_sample_batch(&self, cb: retro_audio_sample_batch_t) {
-        unsafe { (&self.retro_set_audio_sample_batch)(env) }
+        unsafe { (&self.retro_set_audio_sample_batch)(cb) }
     }
     pub fn set_input_poll(&self, cb: retro_input_poll_t) {
-        unsafe { (&self.retro_set_input_poll)(env) }
+        unsafe { (&self.retro_set_input_poll)(cb) }
     }
     pub fn set_input_state(&self, cb: retro_input_state_t) {
-        unsafe { (&self.retro_set_input_state)(env) }
+        unsafe { (&self.retro_set_input_state)(cb) }
     }
-    /// retro_set_environment() must be called before retro_init().
+    /// set_environment() must be called before init().
     pub fn init(&self) {
         // TODO assert!(called retro_set_environment);
         unsafe { (&self.retro_init)() }
@@ -130,9 +139,8 @@ impl<'a> LibretroApi<'a> {
         }
     }
     /** Gets information about system audio/video timings and geometry.
-     * Can be called only after retro_load_game() has successfully completed.
-     * NOTE: The implementation of this function might not initialize every
-     * variable if needed.
+     * Can be called only after load_game() has successfully completed.
+     * NOTE: The implementation of this function might not initialize every variable if needed.
      * E.g. geom.aspect_ratio might not be initialized if core doesn't
      * desire a particular aspect ratio. */
     pub fn get_system_av_info(&self) -> retro_system_av_info {
@@ -232,10 +240,10 @@ impl<'a> LibretroApi<'a> {
     pub fn unload_game(&self) {
         unsafe { (&self.retro_unload_game)() }
     }
-    pub fn get_region(&self) -> u32 {
-        unsafe { (&self.retro_get_region)() as u32 }
+    pub fn get_region(&self) -> Region {
+        unsafe { (&self.retro_get_region)().try_into().expect("Invalid region") }
     }
-    /// Gets region of memory
+    /// Gets (read/write access to) a region of memory
     pub fn get_memory(&self, id: u32) -> &mut [u8] {
         unsafe {
             let data = (&self.retro_get_memory_data)(id);

src/main.rs

@@ -6,6 +6,7 @@ use std::ffi::CStr;
 #[allow(non_camel_case_types, non_upper_case_globals, non_snake_case, dead_code)]
 mod libretro_types;
 mod libretro_loading;
+mod libretro_convert;
 
 fn main() -> failure::Fallible<()> {
     let lib = libloading::Library::new("/home/lifning/.config/retroarch/cores/gambatte_libretro.so")?;