start making giant match statement in environment cb wrapper

src/libretro_convert.rs

@@ -1,19 +1,19 @@
 use std::convert::{TryFrom, TryInto};
-use std::os::raw::{c_uint, c_void};
+use std::os::raw::c_uint;
 use std::path::PathBuf;
 
-use num_enum::TryFromPrimitive;
+use num_enum::{TryFromPrimitive, IntoPrimitive};
 
 use crate::libretro_ffi::*;
 
-#[derive(TryFromPrimitive)]
+#[derive(TryFromPrimitive, IntoPrimitive)]
 #[repr(u32)]
 pub enum Region {
     NTSC = RETRO_REGION_NTSC,
     PAL = RETRO_REGION_PAL,
 }
 
-#[derive(TryFromPrimitive)]
+#[derive(TryFromPrimitive, IntoPrimitive)]
 #[repr(u32)]
 pub enum DeviceType {
     None = RETRO_DEVICE_NONE,
@@ -25,7 +25,7 @@ pub enum DeviceType {
     Pointer = RETRO_DEVICE_POINTER,
 }
 
-#[derive(TryFromPrimitive)]
+#[derive(TryFromPrimitive, IntoPrimitive)]
 #[repr(u32)]
 pub enum DeviceIndex {
     Left = RETRO_DEVICE_INDEX_ANALOG_LEFT,
@@ -33,7 +33,7 @@ pub enum DeviceIndex {
     Button = RETRO_DEVICE_INDEX_ANALOG_BUTTON,
 }
 
-#[derive(TryFromPrimitive)]
+#[derive(TryFromPrimitive, IntoPrimitive)]
 #[repr(u32)]
 pub enum JoypadButton {
     B = RETRO_DEVICE_ID_JOYPAD_B,
@@ -54,14 +54,14 @@ pub enum JoypadButton {
     R3 = RETRO_DEVICE_ID_JOYPAD_R3,
 }
 
-#[derive(TryFromPrimitive)]
+#[derive(TryFromPrimitive, IntoPrimitive)]
 #[repr(u32)]
 pub enum AnalogAxis {
     X = RETRO_DEVICE_ID_ANALOG_X,
     Y = RETRO_DEVICE_ID_ANALOG_Y,
 }
 
-#[derive(TryFromPrimitive)]
+#[derive(TryFromPrimitive, IntoPrimitive)]
 #[repr(u32)]
 pub enum MouseButton {
     X = RETRO_DEVICE_ID_MOUSE_X,
@@ -77,7 +77,7 @@ pub enum MouseButton {
     Button5 = RETRO_DEVICE_ID_MOUSE_BUTTON_5,
 }
 
-#[derive(TryFromPrimitive)]
+#[derive(TryFromPrimitive, IntoPrimitive)]
 #[repr(u32)]
 pub enum LightGunButton {
     ScreenX = RETRO_DEVICE_ID_LIGHTGUN_SCREEN_X,
@@ -99,7 +99,7 @@ pub enum LightGunButton {
     Pause = RETRO_DEVICE_ID_LIGHTGUN_PAUSE,
 }
 
-#[derive(TryFromPrimitive)]
+#[derive(TryFromPrimitive, IntoPrimitive)]
 #[repr(u32)]
 pub enum PointerStat {
     X = RETRO_DEVICE_ID_POINTER_X,
@@ -137,7 +137,7 @@ impl<D> TryFrom<(D, c_uint)> for Input
     }
 }
 
-#[derive(TryFromPrimitive)]
+#[derive(TryFromPrimitive, IntoPrimitive)]
 #[repr(u32)]
 pub enum EnvRotation {
     None = 0,
@@ -146,7 +146,7 @@ pub enum EnvRotation {
     CounterClockwise270 = 3,
 }
 
-#[derive(TryFromPrimitive)]
+#[derive(TryFromPrimitive, IntoPrimitive)]
 #[repr(u32)]
 pub enum EnvPixelFormat {
     XRGB555 = retro_pixel_format_RETRO_PIXEL_FORMAT_0RGB1555,
@@ -162,7 +162,7 @@ pub struct EnvVariable {
     value: Option<String>,
 }
 
-#[derive(TryFromPrimitive)]
+#[derive(TryFromPrimitive, IntoPrimitive)]
 #[repr(u32)]
 pub enum EnvLanguage {
     English = retro_language_RETRO_LANGUAGE_ENGLISH,
@@ -186,90 +186,89 @@ pub enum EnvLanguage {
     Last = retro_language_RETRO_LANGUAGE_LAST,
 }
 
-// TODO: lifetime
 // TODO: experimental calls
+#[derive(TryFromPrimitive, IntoPrimitive)]
+#[repr(u32)]
 pub enum EnvironmentCmdData {
-    SetRotation(EnvRotation),
+    SetRotation = RETRO_ENVIRONMENT_SET_ROTATION,
-    GetOverscan(&'static mut bool),
+    GetOverscan = RETRO_ENVIRONMENT_GET_OVERSCAN,
-    GetCanDupe(&'static mut bool),
+    GetCanDupe = RETRO_ENVIRONMENT_GET_CAN_DUPE,
-    SetMessage(retro_message), // TODO
+    SetMessage = RETRO_ENVIRONMENT_SET_MESSAGE,
-    Shutdown,
+    Shutdown = RETRO_ENVIRONMENT_SHUTDOWN,
-    SetPerformanceLevel(c_uint),
+    SetPerformanceLevel = RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL,
-    GetSystemDirectory(&'static mut PathBuf),
+    GetSystemDirectory = RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY,
-    SetPixelFormat(EnvPixelFormat),
+    SetPixelFormat = RETRO_ENVIRONMENT_SET_PIXEL_FORMAT,
-    SetInputDescriptors(&'static [retro_input_descriptor]), // TODO
+    SetInputDescriptors = RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS,
-    SetKeyboardCallback(retro_keyboard_callback), // TODO
+    SetKeyboardCallback = RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK,
-    SetDiskControlInterface(retro_disk_control_callback), // TODO
+    SetDiskControlInterface = RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE,
-    SetHwRender(retro_hw_render_callback), // TODO
+    SetHwRender = RETRO_ENVIRONMENT_SET_HW_RENDER,
-    GetVariable(&'static mut EnvVariable),
+    GetVariable = RETRO_ENVIRONMENT_GET_VARIABLE,
-    SetVariables(&'static [EnvVariable]),
+    SetVariables = RETRO_ENVIRONMENT_SET_VARIABLES,
-    GetVariableUpdate(&'static mut bool),
+    GetVariableUpdate = RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE,
-    SetSupportNoGame(bool),
+    SetSupportNoGame = RETRO_ENVIRONMENT_SET_SUPPORT_NO_GAME,
-    GetLibretroPath(&'static mut PathBuf),
+    GetLibretroPath = RETRO_ENVIRONMENT_GET_LIBRETRO_PATH,
-    SetFrameTimeCallback(retro_frame_time_callback), // TODO
+    SetFrameTimeCallback = RETRO_ENVIRONMENT_SET_FRAME_TIME_CALLBACK,
-    SetAudioCallback(retro_audio_callback), // TODO
+    SetAudioCallback = RETRO_ENVIRONMENT_SET_AUDIO_CALLBACK,
-    GetRumbleInterface(&'static mut retro_rumble_interface), // TODO
+    GetRumbleInterface = RETRO_ENVIRONMENT_GET_RUMBLE_INTERFACE,
-    GetInputDeviceCapabilities(&'static mut u64), // TODO
+    GetInputDeviceCapabilities = RETRO_ENVIRONMENT_GET_INPUT_DEVICE_CAPABILITIES,
-    GetSensorInterface(&'static mut retro_sensor_interface), // TODO
+    GetSensorInterface = RETRO_ENVIRONMENT_GET_SENSOR_INTERFACE,
-    GetCameraInterface(&'static mut retro_camera_callback), // TODO
+    GetCameraInterface = RETRO_ENVIRONMENT_GET_CAMERA_INTERFACE,
-    GetLogInterface(&'static mut retro_log_callback), // TODO
+    GetLogInterface = RETRO_ENVIRONMENT_GET_LOG_INTERFACE,
-    GetPerfInterface(&'static mut retro_perf_callback), // TODO
+    GetPerfInterface = RETRO_ENVIRONMENT_GET_PERF_INTERFACE,
-    GetLocationInterface(&'static mut retro_location_callback), // TODO
+    GetLocationInterface = RETRO_ENVIRONMENT_GET_LOCATION_INTERFACE,
-    GetCoreAssetsDirectory(&'static mut PathBuf),
+    GetCoreAssetsDirectory = RETRO_ENVIRONMENT_GET_CORE_ASSETS_DIRECTORY,
-    GetSaveDirectory(&'static mut PathBuf),
+    GetSaveDirectory = RETRO_ENVIRONMENT_GET_SAVE_DIRECTORY,
-    SetSystemAvInfo(retro_system_av_info),
+    SetSystemAvInfo = RETRO_ENVIRONMENT_SET_SYSTEM_AV_INFO,
-    SetProcAddressCallback(retro_get_proc_address_interface), // TODO
+    SetProcAddressCallback = RETRO_ENVIRONMENT_SET_PROC_ADDRESS_CALLBACK,
-    SetSubsystemInfo(retro_subsystem_info), // TODO
+    SetSubsystemInfo = RETRO_ENVIRONMENT_SET_SUBSYSTEM_INFO,
-    SetControllerInfo(retro_controller_info), // TODO
+    SetControllerInfo = RETRO_ENVIRONMENT_SET_CONTROLLER_INFO,
-    SetMemoryMaps(retro_memory_map), // TODO
+    SetMemoryMaps = RETRO_ENVIRONMENT_SET_MEMORY_MAPS,
-    SetGeometry(retro_game_geometry), // TODO
+    SetGeometry = RETRO_ENVIRONMENT_SET_GEOMETRY,
-    GetUsername(&'static mut String),
+    GetUsername = RETRO_ENVIRONMENT_GET_USERNAME,
-    GetLanguage(&'static mut EnvLanguage),
+    GetLanguage = RETRO_ENVIRONMENT_GET_LANGUAGE,
-    SetSerializationQuirks(&'static mut u64), // TODO
+    SetSerializationQuirks = RETRO_ENVIRONMENT_SET_SERIALIZATION_QUIRKS,
 }
 
 pub trait HandlesEnvironment: Send + Sync + 'static {
-    // TODO: wrap cmd+data in enum
+    fn set_rotation(&mut self, rotation: EnvRotation) -> bool { false }
-    fn environment(&mut self, cmd: u32, data: *mut c_void) -> bool;
+    fn get_overscan(&mut self) -> Option<bool> { None }
-
+    fn get_can_dupe(&mut self) -> Option<bool> { None }
-    fn SetRotation(&mut self, rotation: EnvRotation) -> bool;
+    fn set_message(&mut self, message: retro_message) -> bool { false }
-    fn GetOverscan(&mut self, overscan: &mut bool) -> bool;
+    fn shutdown(&mut self) -> bool { false }
-    fn GetCanDupe(&mut self, frame_duping: &mut bool) -> bool;
+    fn set_performance_level(&mut self, level: c_uint) -> bool { false }
-    fn SetMessage(&mut self, message: retro_message) -> bool;
+    fn get_system_directory(&mut self) -> Option<PathBuf> { None }
-    fn Shutdown(&mut self) -> bool;
+    fn set_pixel_format(&mut self, format: EnvPixelFormat) -> bool { false }
-    fn SetPerformanceLevel(&mut self, level: c_uint) -> bool;
+    fn set_input_descriptors(&mut self, input_descriptors: &[retro_input_descriptor]) -> bool { false }
-    fn GetSystemDirectory(&mut self, path: &mut PathBuf) -> bool;
+    fn set_keyboard_callback(&mut self, cb: retro_keyboard_callback) -> bool { false }
-    fn SetPixelFormat(&mut self, format: EnvPixelFormat) -> bool;
+    fn set_disk_control_interface(&mut self, cb: retro_disk_control_callback) -> bool { false }
-    fn SetInputDescriptors(&mut self, input_descriptors: &[retro_input_descriptor]) -> bool;
+    fn set_hw_render(&mut self, hw_render_callback: retro_hw_render_callback) -> bool { false }
-    fn SetKeyboardCallback(&mut self, keyboard_callback: retro_keyboard_callback) -> bool;
+    fn get_variable(&mut self) -> Option<EnvVariable> { None }
-    fn SetDiskControlInterface(&mut self, disk_control_callback: retro_disk_control_callback) -> bool;
+    fn set_variables(&mut self, variables: &[EnvVariable]) -> bool { false }
-    fn SetHwRender(&mut self, hw_render_callback: retro_hw_render_callback) -> bool;
+    fn get_variable_update(&mut self) -> Option<bool> { None }
-    fn GetVariable(&mut self, variable: &mut EnvVariable) -> bool;
+    fn set_support_no_game(&mut self, supports_no_game: bool) -> bool { false }
-    fn SetVariables(&mut self, variables: &[EnvVariable]) -> bool;
+    fn get_libretro_path(&mut self) -> Option<PathBuf> { None }
-    fn GetVariableUpdate(&mut self, variables_updated: &mut bool) -> bool;
+    fn set_frame_time_callback(&mut self, cb: retro_frame_time_callback) -> bool { false }
-    fn SetSupportNoGame(&mut self, supports_no_game: bool) -> bool;
+    fn set_audio_callback(&mut self, audio_callback: retro_audio_callback) -> bool { false }
-    fn GetLibretroPath(&mut self, path: &mut PathBuf) -> bool;
+    fn get_rumble_interface(&mut self) -> Option<retro_rumble_interface> { None }
-    fn SetFrameTimeCallback(&mut self, frame_time_callback: retro_frame_time_callback) -> bool;
+    fn get_input_device_capabilities(&mut self) -> Option<u64> { None }
-    fn SetAudioCallback(&mut self, audio_callback: retro_audio_callback) -> bool;
+    fn get_sensor_interface(&mut self) -> Option<retro_sensor_interface> { None }
-    fn GetRumbleInterface(&mut self, rumble_interface: &mut retro_rumble_interface) -> bool;
+    fn get_camera_interface(&mut self) -> Option<retro_camera_callback> { None }
-    fn GetInputDeviceCapabilities(&mut self, input_device_capabilities: &mut u64) -> bool;
+    fn get_log_interface(&mut self) -> Option<retro_log_callback> { None }
-    fn GetSensorInterface(&mut self, sensor_interface: &mut retro_sensor_interface) -> bool;
+    fn get_perf_interface(&mut self) -> Option<retro_perf_callback> { None }
-    fn GetCameraInterface(&mut self, camera_callback: &mut retro_camera_callback) -> bool;
+    fn get_location_interface(&mut self) -> Option<retro_location_callback> { None }
-    fn GetLogInterface(&mut self, log_callback: &mut retro_log_callback) -> bool;
+    fn get_core_assets_directory(&mut self) -> Option<PathBuf> { None }
-    fn GetPerfInterface(&mut self, perf_callback: &mut retro_perf_callback) -> bool;
+    fn get_save_directory(&mut self) -> Option<PathBuf> { None }
-    fn GetLocationInterface(&mut self, location_callback: &mut retro_location_callback) -> bool;
+    fn set_system_av_info(&mut self, system_av_info: retro_system_av_info) -> bool { false }
-    fn GetCoreAssetsDirectory(&mut self, path: &mut PathBuf) -> bool;
+    fn set_proc_address_callback(&mut self, cb: retro_get_proc_address_interface) -> bool { false }
-    fn GetSaveDirectory(&mut self, path: &mut PathBuf) -> bool;
+    fn set_subsystem_info(&mut self, subsystem_info: retro_subsystem_info) -> bool { false }
-    fn SetSystemAvInfo(&mut self, system_av_info: retro_system_av_info) -> bool;
+    fn set_controller_info(&mut self, controller_info: retro_controller_info) -> bool { false }
-    fn SetProcAddressCallback(&mut self, get_proc_address_interface: retro_get_proc_address_interface) -> bool;
+    fn set_memory_maps(&mut self, memory_map: retro_memory_map) -> bool { false }
-    fn SetSubsystemInfo(&mut self, subsystem_info: retro_subsystem_info) -> bool;
+    fn set_geometry(&mut self, game_geometry: retro_game_geometry) -> bool { false }
-    fn SetControllerInfo(&mut self, controller_info: retro_controller_info) -> bool;
+    fn get_username(&mut self) -> Option<String> { None }
-    fn SetMemoryMaps(&mut self, memory_map: retro_memory_map) -> bool;
+    fn get_language(&mut self) -> Option<EnvLanguage> { None }
-    fn SetGeometry(&mut self, game_geometry: retro_game_geometry) -> bool;
+    fn set_serialization_quirks(&mut self, quirks: &mut u64) -> bool { false }
-    fn GetUsername(&mut self, username: &mut String) -> bool;
-    fn GetLanguage(&mut self, language: &mut EnvLanguage) -> bool;
-    fn SetSerializationQuirks(&mut self, quirks: &mut u64) -> bool;
 }
+
 pub trait HandlesVideoRefresh: Send + Sync + 'static {
     fn video_refresh(&mut self, data: &[u8], width: c_uint, height: c_uint, pitch: c_uint);
 }

src/libretro_wrapper.rs

@@ -2,10 +2,13 @@ use core::convert::TryInto;
 use core::ffi::c_void;
 use core::slice::from_raw_parts;
 
-use std::os::raw::c_uint;
+use std::ffi::CString;
+use std::os::raw::{c_uint, c_char};
 
 use crate::libretro_convert::*;
 use crate::libretro_loading::*;
+use std::path::Path;
+use num_enum::{IntoPrimitive, TryFromPrimitive};
 
 static mut CB_SINGLETON: StaticCallbacks = StaticCallbacks {
     environment: None,
@@ -29,13 +32,80 @@ struct StaticCallbacks {
 unsafe impl Sync for StaticCallbacks {}
 
 impl StaticCallbacks {
-    extern "C" fn environment_cb(cmd: u32, data: *mut c_void) -> bool {
+    // helpers for environ cb
-        match unsafe { CB_SINGLETON.environment.as_mut() } {
+    fn clone_into_void<T: Clone>(data: *mut c_void, source: &T) -> Option<bool> {
-            Some(cb) => cb.environment(cmd, data),
+        unsafe { (data as *mut T).as_mut() }?.clone_from(source);
-            None => false,
+        Some(true)
-        }
     }
-    extern "C" fn video_refresh_cb(data: *const c_void, width: c_uint, height: c_uint, pitch: usize) {
+    fn string_into_void(data: *mut c_void, source: impl AsRef<str>) -> Option<bool> {
+        *unsafe { (data as *mut *const c_char).as_mut()? } = CString::new(source.as_ref()).ok()?.into_raw();
+        Some(true)
+    }
+    fn path_into_void(data: *mut c_void, source: impl AsRef<Path>) -> Option<bool> {
+        Self::string_into_void(data, source.as_ref().to_string_lossy())
+    }
+    fn from_void<T>(data: *mut c_void) -> Option<&'static mut T> {
+        unsafe { (data as *mut T).as_mut() }
+    }
+    fn enum_from_void<T>(data: *mut c_void) -> Option<T>
+        where T: TryFromPrimitive, <T as TryFromPrimitive>::Primitive: 'static
+    {
+        let number = Self::from_void(data).cloned()?;
+        T::try_from_primitive(number).ok()
+    }
+    fn environment_cb_inner(cmd: u32, data: *mut c_void) -> Option<bool> {
+        let mut handler = unsafe { CB_SINGLETON.environment.as_mut() }?;
+        match cmd.try_into().ok()? {
+            EnvironmentCmdData::SetRotation => handler.set_rotation(Self::enum_from_void(data)?),
+            EnvironmentCmdData::GetOverscan => Self::clone_into_void(data, &handler.get_overscan()?)?,
+            EnvironmentCmdData::GetCanDupe => Self::clone_into_void(data, &handler.get_can_dupe()?)?,
+            EnvironmentCmdData::SetMessage => handler.set_message(*Self::from_void(data)?),
+            EnvironmentCmdData::Shutdown => handler.shutdown(),
+            EnvironmentCmdData::SetPerformanceLevel => handler.set_performance_level(*Self::from_void(data)?),
+            EnvironmentCmdData::GetSystemDirectory => Self::path_into_void(data, handler.get_system_directory()?)?,
+            EnvironmentCmdData::SetPixelFormat => handler.set_pixel_format(Self::enum_from_void(data)?),
+            // TODO EnvironmentCmdData::SetInputDescriptors => {},
+            // TODO EnvironmentCmdData::SetKeyboardCallback => {},
+            // TODO EnvironmentCmdData::SetDiskControlInterface => {},
+            // TODO EnvironmentCmdData::SetHwRender => {},
+            // TODO EnvironmentCmdData::GetVariable => {}, -- also change to mut parameter?
+            // TODO EnvironmentCmdData::SetVariables => {},
+            EnvironmentCmdData::GetVariableUpdate => Self::clone_into_void(data, &handler.get_variable_update()?)?,
+            EnvironmentCmdData::SetSupportNoGame => handler.set_support_no_game(*Self::from_void(data)?),
+            EnvironmentCmdData::GetLibretroPath => Self::path_into_void(data, handler.get_libretro_path()?)?,
+            // TODO EnvironmentCmdData::SetFrameTimeCallback => {},
+            // TODO EnvironmentCmdData::SetAudioCallback => {},
+            // TODO EnvironmentCmdData::GetRumbleInterface => {},
+            EnvironmentCmdData::GetInputDeviceCapabilities => Self::clone_into_void(data, &handler.get_input_device_capabilities()?)?,
+            // TODO EnvironmentCmdData::GetSensorInterface => {},
+            // TODO EnvironmentCmdData::GetCameraInterface => {},
+            // TODO EnvironmentCmdData::GetLogInterface => {},
+            // TODO EnvironmentCmdData::GetPerfInterface => {},
+            // TODO EnvironmentCmdData::GetLocationInterface => {},
+            EnvironmentCmdData::GetCoreAssetsDirectory => Self::path_into_void(data, handler.get_core_assets_directory()?)?,
+            EnvironmentCmdData::GetSaveDirectory => Self::path_into_void(data, handler.get_save_directory()?)?,
+            EnvironmentCmdData::SetSystemAvInfo => handler.set_system_av_info(*Self::from_void(data)?),
+            // TODO EnvironmentCmdData::SetProcAddressCallback => {},
+            // TODO EnvironmentCmdData::SetSubsystemInfo => {},
+            // TODO EnvironmentCmdData::SetControllerInfo => {},
+            // TODO EnvironmentCmdData::SetMemoryMaps => {},
+            EnvironmentCmdData::SetGeometry => handler.set_geometry(*Self::from_void(data)?),
+            EnvironmentCmdData::GetUsername => Self::string_into_void(data, handler.get_username()?)?,
+            EnvironmentCmdData::GetLanguage => Self::clone_into_void(data, &c_uint::from(handler.get_language()?))?,
+            EnvironmentCmdData::SetSerializationQuirks => handler.set_serialization_quirks(Self::from_void(data)?),
+            _ => false,
+        }.into()
+    }
+    extern "C" fn environment_cb(cmd: u32, data: *mut c_void) -> bool {
+        Self::environment_cb_inner(cmd, data).unwrap_or(false)
+    }
+
+    extern "C" fn video_refresh_cb(
+        data: *const c_void,
+        width: c_uint,
+        height: c_uint,
+        pitch: usize,
+    ) {
         if !data.is_null() {
             if let Some(cb) = unsafe { CB_SINGLETON.video_refresh.as_mut() } {
                 let data = data as *const u8;
@@ -56,7 +126,7 @@ impl StaticCallbacks {
                 Some(cb) => match data.is_null() {
                     true => 0,
                     false => cb.audio_sample_batch(from_raw_parts(data, frames)),
-                }
+                },
                 None => 0,
             }
         }
@@ -74,22 +144,34 @@ impl StaticCallbacks {
         }
     }
     pub(crate) fn set_environment(cb: &'static mut dyn HandlesEnvironment) {
-        unsafe { CB_SINGLETON.environment.replace(cb); }
+        unsafe {
+            CB_SINGLETON.environment.replace(cb);
+        }
     }
     pub(crate) fn set_video_refresh(cb: &'static mut dyn HandlesVideoRefresh) {
-        unsafe { CB_SINGLETON.video_refresh.replace(cb); }
+        unsafe {
+            CB_SINGLETON.video_refresh.replace(cb);
+        }
     }
     pub(crate) fn set_audio_sample(cb: &'static mut dyn HandlesAudioSample) {
-        unsafe { CB_SINGLETON.audio_sample.replace(cb); }
+        unsafe {
+            CB_SINGLETON.audio_sample.replace(cb);
+        }
     }
     pub(crate) fn set_audio_sample_batch(cb: &'static mut dyn HandlesAudioSampleBatch) {
-        unsafe { CB_SINGLETON.audio_sample_batch.replace(cb); }
+        unsafe {
+            CB_SINGLETON.audio_sample_batch.replace(cb);
+        }
     }
     pub(crate) fn set_input_poll(cb: &'static mut dyn HandlesInputPoll) {
-        unsafe { CB_SINGLETON.input_poll.replace(cb); }
+        unsafe {
+            CB_SINGLETON.input_poll.replace(cb);
+        }
     }
     pub(crate) fn set_input_state(cb: &'static mut dyn HandlesInputState) {
-        unsafe { CB_SINGLETON.input_state.replace(cb); }
+        unsafe {
+            CB_SINGLETON.input_state.replace(cb);
+        }
     }
     pub(crate) fn reset() {
         unsafe {
@@ -115,9 +197,7 @@ impl<'a> From<LibretroApi<'a>> for LibretroWrapper<'a> {
         api.set_audio_sample_batch(Some(StaticCallbacks::audio_sample_batch_cb));
         api.set_input_poll(Some(StaticCallbacks::input_poll_cb));
         api.set_input_state(Some(StaticCallbacks::input_state_cb));
-        LibretroWrapper {
+        LibretroWrapper { api }
-            api,
-        }
     }
 }
 
@@ -148,7 +228,10 @@ impl<'a> LibretroWrapper<'a> {
         let ptr: *mut dyn HandlesAudioSample = handler;
         StaticCallbacks::set_audio_sample(unsafe { ptr.as_mut() }.unwrap());
     }
-    pub fn register_audio_sample_batch_handler(&self, handler: &'a mut dyn HandlesAudioSampleBatch) {
+    pub fn register_audio_sample_batch_handler(
+        &self,
+        handler: &'a mut dyn HandlesAudioSampleBatch,
+    ) {
         let ptr: *mut dyn HandlesAudioSampleBatch = handler;
         StaticCallbacks::set_audio_sample_batch(unsafe { ptr.as_mut() }.unwrap());
     }
@@ -160,4 +243,20 @@ impl<'a> LibretroWrapper<'a> {
         let ptr: *mut dyn HandlesInputState = handler;
         StaticCallbacks::set_input_state(unsafe { ptr.as_mut() }.unwrap());
     }
+    pub fn register_for_all<T>(&self, handler: &'a mut T)
+    where
+        T: HandlesEnvironment
+            + HandlesVideoRefresh
+            + HandlesAudioSample
+            + HandlesAudioSampleBatch
+            + HandlesInputPoll
+            + HandlesInputState,
+    {
+        self.register_environment_handler(handler);
+        self.register_video_refresh_handler(handler);
+        self.register_audio_sample_handler(handler);
+        self.register_audio_sample_batch_handler(handler);
+        self.register_input_poll_handler(handler);
+        self.register_input_state_handler(handler);
+    }
 }

src/main.rs

@@ -7,7 +7,7 @@ mod libretro_loading;
 mod libretro_convert;
 mod libretro_wrapper;
 
-use std::ffi::{CStr, c_void};
+use std::ffi::CStr;
 use std::path::PathBuf;
 
 use structopt::StructOpt;
@@ -16,159 +16,6 @@ use crate::libretro_convert::{HandlesEnvironment, HandlesVideoRefresh};
 
 struct Foo;
 impl HandlesEnvironment for Foo {
-    fn environment(&mut self, cmd: u32, data: *mut c_void) -> bool {
-        println!("environment cmd: {}", cmd);
-        false
-    }
-
-    fn SetRotation(&mut self, rotation: EnvRotation) -> bool {
-        false
-    }
-
-    fn GetOverscan(&mut self, overscan: &mut bool) -> bool {
-        false
-    }
-
-    fn GetCanDupe(&mut self, frame_duping: &mut bool) -> bool {
-        false
-    }
-
-    fn SetMessage(&mut self, message: retro_message) -> bool {
-        false
-    }
-
-    fn Shutdown(&mut self) -> bool {
-        false
-    }
-
-    fn SetPerformanceLevel(&mut self, level: c_uint) -> bool {
-        false
-    }
-
-    fn GetSystemDirectory(&mut self, path: &mut PathBuf) -> bool {
-        false
-    }
-
-    fn SetPixelFormat(&mut self, format: EnvPixelFormat) -> bool {
-        false
-    }
-
-    fn SetInputDescriptors(&mut self, input_descriptors: &[retro_input_descriptor]) -> bool {
-        false
-    }
-
-    fn SetKeyboardCallback(&mut self, keyboard_callback: retro_keyboard_callback) -> bool {
-        false
-    }
-
-    fn SetDiskControlInterface(&mut self, disk_control_callback: retro_disk_control_callback) -> bool {
-        false
-    }
-
-    fn SetHwRender(&mut self, hw_render_callback: retro_hw_render_callback) -> bool {
-        false
-    }
-
-    fn GetVariable(&mut self, variable: &mut EnvVariable) -> bool {
-        false
-    }
-
-    fn SetVariables(&mut self, variables: &[EnvVariable]) -> bool {
-        false
-    }
-
-    fn GetVariableUpdate(&mut self, variables_updated: &mut bool) -> bool {
-        false
-    }
-
-    fn SetSupportNoGame(&mut self, supports_no_game: bool) -> bool {
-        false
-    }
-
-    fn GetLibretroPath(&mut self, path: &mut PathBuf) -> bool {
-        false
-    }
-
-    fn SetFrameTimeCallback(&mut self, frame_time_callback: retro_frame_time_callback) -> bool {
-        false
-    }
-
-    fn SetAudioCallback(&mut self, audio_callback: retro_audio_callback) -> bool {
-        false
-    }
-
-    fn GetRumbleInterface(&mut self, rumble_interface: &mut retro_rumble_interface) -> bool {
-        false
-    }
-
-    fn GetInputDeviceCapabilities(&mut self, input_device_capabilities: &mut u64) -> bool {
-        false
-    }
-
-    fn GetSensorInterface(&mut self, sensor_interface: &mut retro_sensor_interface) -> bool {
-        false
-    }
-
-    fn GetCameraInterface(&mut self, camera_callback: &mut retro_camera_callback) -> bool {
-        false
-    }
-
-    fn GetLogInterface(&mut self, log_callback: &mut retro_log_callback) -> bool {
-        false
-    }
-
-    fn GetPerfInterface(&mut self, perf_callback: &mut retro_perf_callback) -> bool {
-        false
-    }
-
-    fn GetLocationInterface(&mut self, location_callback: &mut retro_location_callback) -> bool {
-        false
-    }
-
-    fn GetCoreAssetsDirectory(&mut self, path: &mut PathBuf) -> bool {
-        false
-    }
-
-    fn GetSaveDirectory(&mut self, path: &mut PathBuf) -> bool {
-        false
-    }
-
-    fn SetSystemAvInfo(&mut self, system_av_info: retro_system_av_info) -> bool {
-        false
-    }
-
-    fn SetProcAddressCallback(&mut self, get_proc_address_interface: retro_get_proc_address_interface) -> bool {
-        false
-    }
-
-    fn SetSubsystemInfo(&mut self, subsystem_info: retro_subsystem_info) -> bool {
-        false
-    }
-
-    fn SetControllerInfo(&mut self, controller_info: retro_controller_info) -> bool {
-        false
-    }
-
-    fn SetMemoryMaps(&mut self, memory_map: retro_memory_map) -> bool {
-        false
-    }
-
-    fn SetGeometry(&mut self, game_geometry: retro_game_geometry) -> bool {
-        false
-    }
-
-    fn GetUsername(&mut self, username: &mut String) -> bool {
-        false
-    }
-
-    fn GetLanguage(&mut self, language: &mut EnvLanguage) -> bool {
-        false
-    }
-
-    fn SetSerializationQuirks(&mut self, quirks: &mut u64) -> bool {
-        false
-    }
-
 }
 
 impl HandlesVideoRefresh for Foo {