Fix infinite drop() loop on close

src/bin/example.rs

@@ -3,7 +3,7 @@ extern crate rustro;
 extern crate sdl2;
 
 use rustro::retro;
-use rustro::retro::ffi::{GameGeometry, SystemAvInfo};
+use rustro::retro::ffi::{GameGeometry, SystemInfo, SystemAvInfo};
 use rustro::retro::constants::{Input, DeviceIndex, JoypadButton, AnalogAxis};
 
 use std::ffi::CStr;
@@ -24,6 +24,7 @@ use sdl2::video::WindowContext;
 
 struct MyEmulator {
     retro: retro::wrapper::LibretroWrapper,
+    sys_info: SystemInfo,
     av_info: SystemAvInfo,
 
     sdl_context: sdl2::Sdl,
@@ -50,10 +51,10 @@ impl MyEmulator {
         let raw_retro = retro::loading::LibretroApi::from_library(lib).unwrap();
         let retro = retro::wrapper::LibretroWrapper::from(raw_retro);
 
+        let sys_info = retro.as_ref().get_system_info();
         let title = format!(
             "{} - rust libretro",
-            unsafe { CStr::from_ptr(retro.as_ref().get_system_info().library_name) }
-                .to_string_lossy()
+            unsafe { CStr::from_ptr(sys_info.library_name) }.to_string_lossy()
         );
 
         let mut av_info = retro.as_ref().get_system_av_info();
@@ -115,6 +116,7 @@ impl MyEmulator {
         let emu = MyEmulator {
             retro,
             av_info,
+            sys_info,
             sdl_context,
             canvas,
             pixel_format,
@@ -160,16 +162,19 @@ impl MyEmulator {
     }
 
     pub fn load_game(&self, rom: impl AsRef<Path>) {
+        let path = rom.as_ref();
         let mut data = None;
         let mut v = Vec::new();
-        if let Ok(mut f) = std::fs::File::open(rom.as_ref()) {
-            if f.read_to_end(&mut v).is_ok() {
-                data = Some(v.as_ref());
+        if !self.sys_info.need_fullpath {
+            if let Ok(mut f) = std::fs::File::open(path) {
+                if f.read_to_end(&mut v).is_ok() {
+                    data = Some(v.as_ref());
+                }
             }
         }
         self.retro
             .as_ref()
-            .load_game(Some(rom.as_ref()), data, None)
+            .load_game(Some(path), data, None)
             .unwrap();
     }
 
@@ -182,6 +187,13 @@ impl MyEmulator {
         }
     }
 }
+
+impl Drop for MyEmulator {
+    fn drop(&mut self) {
+        retro::wrapper::unset_handler();
+    }
+}
+
 impl retro::wrapper::Handler for MyEmulator {
     fn video_refresh(&mut self, data: &[u8], width: u32, height: u32, pitch: u32) {
         let rect = Rect::new(0, 0, width, height);
@@ -248,16 +260,16 @@ impl retro::wrapper::Handler for MyEmulator {
 
     fn set_system_av_info(&mut self, av_info: SystemAvInfo) -> bool {
         let (width, height) = (av_info.geometry.base_width, av_info.geometry.base_height);
-        self.canvas.window_mut().set_size(width, height);
-        self.canvas.set_logical_size(width, height);
+        let _ = self.canvas.window_mut().set_size(width, height);
+        let _ = self.canvas.set_logical_size(width, height);
         self.av_info = av_info;
         true
     }
 
     fn set_geometry(&mut self, geom: GameGeometry) -> bool {
         let (width, height) = (geom.base_width, geom.base_height);
-        self.canvas.window_mut().set_size(width, height);
-        self.canvas.set_logical_size(width, height);
+        let _ = self.canvas.window_mut().set_size(width, height);
+        let _ = self.canvas.set_logical_size(width, height);
         self.av_info.geometry = geom;
         true
     }

src/retro/wrapper.rs

@@ -207,11 +207,6 @@ impl StaticCallbacks {
             None => 0,
         }
     }
-    pub(crate) fn reset() {
-        unsafe {
-            CB_SINGLETON.handler.take();
-        }
-    }
 }
 
 pub struct LibretroWrapper {
@@ -237,12 +232,6 @@ impl AsRef<LibretroApi> for LibretroWrapper {
     }
 }
 
-impl Drop for LibretroWrapper {
-    fn drop(&mut self) {
-        StaticCallbacks::reset();
-    }
-}
-
 // a note on lifetimes: we explicitly lie about them here because as long as they live as long as
 //  the library wrapper itself we're good (we wipe our 'static references on drop() too)
 pub fn set_handler(handler: Pin<&'_ mut (dyn Handler + '_)>) {
@@ -251,3 +240,9 @@ pub fn set_handler(handler: Pin<&'_ mut (dyn Handler + '_)>) {
         CB_SINGLETON.handler.replace(Pin::new_unchecked(ptr.as_mut().unwrap()));
     }
 }
+
+pub fn unset_handler() {
+    unsafe {
+        CB_SINGLETON.handler.take();
+    }
+}