fix a couple minor sdl a/v bugs

ferretro_components/src/provided/sdl2/audio.rs

@@ -69,21 +69,25 @@ impl RetroComponent for SimpleSdl2AudioComponent {
     }
 
     fn post_run(&mut self, _retro: &mut LibretroWrapper) -> ControlFlow {
-        match Self::make_converter(self.src_freq, self.queue.spec()) {
-            Ok(converter) => {
-                if !self.audio_buffer.is_empty() {
-                    let mut samples = std::mem::take(&mut self.audio_buffer);
-                    samples = resample(&converter, samples);
-                    self.audio_buffer = samples;
-                    self.queue.queue(&self.audio_buffer);
-                    self.audio_buffer.clear();
+        if self.src_freq != 0.0 {
+            match Self::make_converter(self.src_freq, self.queue.spec()) {
+                Ok(converter) => {
+                    if !self.audio_buffer.is_empty() {
+                        let mut samples = std::mem::take(&mut self.audio_buffer);
+                        samples = resample(&converter, samples);
+                        self.audio_buffer = samples;
+                        self.queue.queue(&self.audio_buffer);
+                        self.audio_buffer.clear();
+                    }
+                    ControlFlow::Continue
+                }
+                Err(e) => {
+                    eprintln!("Audio sample rate conversion failed: {:?}", e);
+                    ControlFlow::Break
                 }
-                ControlFlow::Continue
-            }
-            Err(e) => {
-                eprintln!("Audio sample rate conversion failed: {:?}", e);
-                ControlFlow::Break
             }
+        } else {
+            ControlFlow::Continue
         }
     }
 }

ferretro_components/src/provided/sdl2/canvas.rs

@@ -4,6 +4,7 @@ use std::ffi::CStr;
 use std::path::Path;
 
 use sdl2::Sdl;
+use sdl2::pixels::PixelFormatEnum;
 use sdl2::render::WindowCanvas;
 use sdl2::video::FullscreenType;
 
@@ -45,19 +46,27 @@ pub(crate) fn sdl2_pixfmt(retro_fmt: PixelFormat) -> sdl2::pixels::PixelFormatEn
 }
 
 pub(crate) fn frame_to_surface<'a>(frame: &'a VideoFrame) -> crate::base::Result<sdl2::surface::Surface<'a>> {
-    let (bytes, pitch) = frame.data_pitch_as_bytes().unwrap();
     let (width, height) = frame.dimensions();
-    let pixel_format = frame
-        .pixel_format()
-        .map(sdl2_pixfmt)
-        .ok_or("Unknown pixel format")?;
-    // dirty, but must be &mut for SDL API.
-    // safe as long as we don't offer a &mut Surface in the public API.
-    let data = unsafe {
-        core::slice::from_raw_parts_mut(bytes.as_ptr() as *mut u8, bytes.len())
-    };
-    sdl2::surface::Surface::from_data(data, width, height, pitch as u32, pixel_format)
-        .map_err(Into::into)
+    if let Some((bytes, pitch)) = frame.data_pitch_as_bytes() {
+        let pixel_format = frame
+            .pixel_format()
+            .map(sdl2_pixfmt)
+            .ok_or("Unknown pixel format")?;
+        // dirty, but must be &mut for SDL API.
+        // safe as long as we don't offer a &mut Surface in the public API.
+        let data = unsafe {
+            core::slice::from_raw_parts_mut(bytes.as_ptr() as *mut u8, bytes.len())
+        };
+        sdl2::surface::Surface::from_data(data, width, height, pitch as u32, pixel_format)
+            .map_err(Into::into)
+    } else {
+        let pixel_format = frame
+            .pixel_format()
+            .map(sdl2_pixfmt)
+            .unwrap_or(PixelFormatEnum::ARGB8888);
+        sdl2::surface::Surface::new(width, height, pixel_format)
+            .map_err(Into::into)
+    }
 }
 
 /// Creates a root window in SDL2, then displays each 2D video frame provided by the core

ferretro_components/src/provided/sdl2/opengl.rs

@@ -5,6 +5,7 @@ use std::os::raw::c_uint;
 use std::path::Path;
 
 use sdl2::Sdl;
+use sdl2::rect::Rect;
 use sdl2::render::WindowCanvas;
 use sdl2::video::FullscreenType;
 
@@ -100,7 +101,6 @@ impl RetroComponent for SimpleSdl2OpenglComponent {
             rom.file_stem().unwrap_or_default().to_string_lossy(),
         );
         self.canvas.window_mut().set_title(&title)?;
-        self.canvas.window_mut().show();
         self.set_geometry(&retro.get_system_av_info().geometry);
         Ok(())
     }
@@ -108,14 +108,21 @@ impl RetroComponent for SimpleSdl2OpenglComponent {
 
 impl RetroCallbacks for SimpleSdl2OpenglComponent {
     fn video_refresh(&mut self, frame: &VideoFrame) {
+        self.canvas.window_mut().show();
+        let output_size = self.canvas.output_size().unwrap();
         match frame {
             VideoFrame::HardwareRender { .. } => {
+                if output_size != self.win_size {
+                    let (w, h) = output_size;
+                    // FIXME: this isn't enough - need core to render to texture that we just scale
+                    self.canvas.set_viewport(Rect::new(0, 0, w, h));
+                    self.win_size = output_size;
+                }
                 self.canvas.present();
                 unsafe { (self.glClear)(gl::COLOR_BUFFER_BIT); }
             }
             VideoFrame::Duplicate { .. } => {}
             _ => {
-                let output_size = self.canvas.output_size().unwrap();
                 if output_size != self.win_size {
                     self.canvas.clear();
                     self.win_size = output_size;