Support screenshots

src/emulator.rs

@@ -178,7 +178,7 @@ pub struct Emulator {
     debuggers: HashMap<SimId, DebugInfo>,
     stdouts: HashMap<SimId, mpsc::Sender<String>>,
     watched_regions: HashMap<MemoryRange, Weak<MemoryRegion>>,
-    eye_contents: Vec<u8>,
+    eye_contents: [Vec<u8>; 2],
     audio_samples: Vec<f32>,
     buffer: Vec<u8>,
 }
@@ -205,7 +205,7 @@ impl Emulator {
             debuggers: HashMap::new(),
             stdouts: HashMap::new(),
             watched_regions: HashMap::new(),
-            eye_contents: vec![0u8; 384 * 224 * 2],
+            eye_contents: [vec![0u8; 384 * 224 * 2], vec![0u8; 384 * 224 * 2]],
             audio_samples: Vec::with_capacity(EXPECTED_FRAME_SIZE),
             buffer: vec![],
         })
@@ -528,9 +528,12 @@ impl Emulator {
             let Some(sim) = self.sims.get_mut(sim_id.to_index()) else {
                 continue;
             };
-            if sim.read_pixels(&mut self.eye_contents) {
+            if sim.read_pixels(&mut self.eye_contents[sim_id.to_index()]) {
                 idle = false;
-                if renderer.queue_render(&self.eye_contents).is_err() {
+                if renderer
+                    .queue_render(&self.eye_contents[sim_id.to_index()])
+                    .is_err()
+                {
                     self.renderers.remove(&sim_id);
                 }
             }
@@ -702,6 +705,10 @@ impl Emulator {
                     sim.set_keys(keys);
                 }
             }
+            EmulatorCommand::Screenshot(sim_id, sender) => {
+                let contents = self.eye_contents[sim_id.to_index()].clone();
+                let _ = sender.send(contents);
+            }
             EmulatorCommand::Exit(done) => {
                 for sim_id in SimId::values() {
                     if let Err(error) = self.save_sram(sim_id) {
@@ -761,6 +768,7 @@ pub enum EmulatorCommand {
     Unlink,
     Reset(SimId),
     SetKeys(SimId, VBKey),
+    Screenshot(SimId, oneshot::Sender<Vec<u8>>),
     Exit(oneshot::Sender<()>),
 }