static-linked libretro core support

ferretro_base/Cargo.toml

@@ -12,3 +12,6 @@ libretro-sys = "0.1"
 libloading = "0.5"
 num_enum = "0.4"
 once_cell = "1"
+
+[features]
+static = []

ferretro_base/build.rs

@@ -3,4 +3,9 @@ fn main() {
     cc::Build::new()
         .file("src/retro/c_ext/log_wrapper.c")
         .compile("log_wrapper");
+    if cfg!(feature = "static") {
+        println!("cargo:rustc-link-search=./lib");
+        println!("cargo:rustc-link-lib=retro");
+        println!("cargo:rustc-link-lib=m");
+    }
 }

ferretro_base/src/retro/loading.rs

@@ -10,7 +10,7 @@ use super::ffi::*;
 pub type Result<T> = std::result::Result<T, Box<dyn std::error::Error + Send + Sync>>;
 
 pub struct LibretroApi {
-    _lib: libloading::Library, // for tying our lifetime to its own
+    _lib: Option<libloading::Library>, // for tying our lifetime to its own
     pub core_api: CoreAPI,
     loaded_game: bool,
     environment_set: bool,
@@ -46,9 +46,68 @@ impl LibretroApi {
                 retro_get_memory_data: *lib.get(b"retro_get_memory_data")?,
                 retro_get_memory_size: *lib.get(b"retro_get_memory_size")?,
             };
-            Ok(LibretroApi { _lib: lib, core_api, loaded_game: false, environment_set: false })
+            Ok(LibretroApi { _lib: Some(lib), core_api, loaded_game: false, environment_set: false })
         }
     }
+    #[cfg(feature = "static")]
+    pub fn from_static() -> Self {
+        use std::os::raw::c_uint;
+        extern "C" {
+            fn retro_set_environment(callback: EnvironmentFn);
+            fn retro_set_video_refresh(callback: VideoRefreshFn);
+            fn retro_set_audio_sample(callback: AudioSampleFn);
+            fn retro_set_audio_sample_batch(callback: AudioSampleBatchFn);
+            fn retro_set_input_poll(callback: InputPollFn);
+            fn retro_set_input_state(callback: InputStateFn);
+            fn retro_init();
+            fn retro_deinit();
+            fn retro_api_version() -> c_uint;
+            fn retro_get_system_info(info: *mut SystemInfo);
+            fn retro_get_system_av_info(info: *mut SystemAvInfo);
+            fn retro_set_controller_port_device(port: c_uint, device: c_uint);
+            fn retro_reset();
+            fn retro_run();
+            fn retro_serialize_size() -> usize;
+            fn retro_serialize(data: *mut c_void, size: usize);
+            fn retro_unserialize(data: *const c_void, size: usize) -> bool;
+            fn retro_cheat_reset();
+            fn retro_cheat_set(index: c_uint, enabled: bool, code: *const c_char);
+            fn retro_load_game(game: *const GameInfo) -> bool;
+            fn retro_load_game_special(game_type: c_uint, info: *const GameInfo, num_info: usize) -> bool;
+            fn retro_unload_game();
+            fn retro_get_region() -> c_uint;
+            fn retro_get_memory_data(id: c_uint) -> *mut c_void;
+            fn retro_get_memory_size(id: c_uint) -> usize;
+        }
+        let core_api = CoreAPI {
+            retro_set_environment,
+            retro_set_video_refresh,
+            retro_set_audio_sample,
+            retro_set_audio_sample_batch,
+            retro_set_input_poll,
+            retro_set_input_state,
+            retro_init,
+            retro_deinit,
+            retro_api_version,
+            retro_get_system_info,
+            retro_get_system_av_info,
+            retro_set_controller_port_device,
+            retro_reset,
+            retro_run,
+            retro_serialize_size,
+            retro_serialize,
+            retro_unserialize,
+            retro_cheat_reset,
+            retro_cheat_set,
+            retro_load_game,
+            retro_load_game_special,
+            retro_unload_game,
+            retro_get_region,
+            retro_get_memory_data,
+            retro_get_memory_size,
+        };
+        LibretroApi { _lib: None, core_api, loaded_game: false, environment_set: false }
+    }
     /// set_environment() must be called before init().
     pub fn set_environment(&mut self, cb: EnvironmentFn) {
         self.environment_set = true;

ferretro_components/Cargo.toml

@@ -8,7 +8,7 @@ edition = "2021"
 cc = "^1"
 
 [dependencies]
-ferretro_base = { path = "../ferretro_base"}
+ferretro_base = { path = "../ferretro_base" }
 libloading = "0.5"
 num_enum = "0.4"
 ffmpeg-next = { version = "4.3.8", optional = true }
@@ -22,6 +22,7 @@ crossbeam-channel = "0.4"
 structopt = "0.3"
 
 [features]
+static = ["ferretro_base/static"]
 ffmpeg_comp = ["ffmpeg-next"]
 sdl2_comp = ["sdl2", "gl", "crossbeam-channel"]
 

ferretro_components/src/base/mod.rs

@@ -4,16 +4,18 @@
 
 use crate::prelude::*;
 use ferretro_base::retro::ffi::*;
+use ferretro_base::retro::loading::LibretroApi;
 use ferretro_base::prelude::{LibretroWrapperAccess, RetroHandlerId};
 
 use core::any::{Any, TypeId};
 use core::pin::Pin;
 
-use std::os::raw::c_uint;
-use std::path::{PathBuf, Path};
-use std::io::Read;
 use std::collections::HashMap;
 use std::ffi::c_void;
+use std::io::Read;
+use std::os::raw::c_uint;
+use std::path::{PathBuf, Path};
+use tempfile::TempDir;
 
 pub struct RetroComponentBase {
     retro: LibretroWrapper,
@@ -37,7 +39,7 @@ pub struct RetroComponentBase {
     cached_geometry: Option<GameGeometry>,
 
     handler_id: Option<RetroHandlerId>,
-    _temp_dir: tempfile::TempDir,
+    _temp_dir: Option<tempfile::TempDir>,
 }
 
 unsafe impl Send for RetroComponentBase {}
@@ -62,7 +64,6 @@ pub trait RetroComponent: RetroCallbacks + Any {
 }
 
 impl RetroComponentBase {
-    // TODO: constructor & wrapper that uses a statically linked libretro?
     pub fn new(core_path: impl AsRef<Path>) -> Pin<Box<Self>> {
         // allow multiple copies of same lib, possibly?
         let temp_dir = tempfile::tempdir().unwrap();
@@ -70,7 +71,16 @@ impl RetroComponentBase {
         std::fs::copy(core_path.as_ref(), &libretro_path).unwrap();
 
         let lib = libloading::Library::new(&libretro_path).unwrap();
-        let raw_retro = ferretro_base::retro::loading::LibretroApi::from_library(lib).unwrap();
+        let raw_retro = LibretroApi::from_library(lib).unwrap();
+        Self::new_inner(raw_retro, libretro_path, Some(temp_dir))
+    }
+
+    #[cfg(feature = "static")]
+    pub fn new_static() -> Pin<Box<Self>> {
+        Self::new_inner(LibretroApi::from_static(), PathBuf::new(), None)
+    }
+
+    fn new_inner(raw_retro: LibretroApi, libretro_path: PathBuf, _temp_dir: Option<TempDir>) -> Pin<Box<Self>> {
         let retro = LibretroWrapper::from(raw_retro);
 
         let emu = RetroComponentBase {
@@ -90,7 +100,7 @@ impl RetroComponentBase {
             cached_memory_map: None,
             cached_geometry: None,
             handler_id: None,
-            _temp_dir: temp_dir,
+            _temp_dir,
         };
 
         let mut pin_emu = Box::pin(emu);