Let sims link/unlink/reset independently

src/emulator/shrooms_vb_core.rs

@@ -58,6 +58,8 @@ type OnFrame = extern "C" fn(sim: *mut VB) -> c_int;
 
 #[link(name = "vb")]
 extern "C" {
+    #[link_name = "vbEmulate"]
+    fn vb_emulate(sim: *mut VB, cycles: *mut u32) -> c_int;
     #[link_name = "vbEmulateEx"]
     fn vb_emulate_ex(sims: *mut *mut VB, count: c_uint, cycles: *mut u32) -> c_int;
     #[link_name = "vbGetCartROM"]
@@ -202,6 +204,19 @@ impl Sim {
         unsafe { vb_set_peer(self.sim, peer.sim) };
     }
 
+    pub fn unlink(&mut self) {
+        let peer = unsafe { vb_get_peer(self.sim) };
+        if !peer.is_null() {
+            unsafe { vb_set_peer(peer, ptr::null_mut()) };
+            unsafe { vb_set_peer(self.sim, ptr::null_mut()) };
+        }
+    }
+
+    pub fn emulate(&mut self) {
+        let mut cycles = 20_000_000;
+        unsafe { vb_emulate(self.sim, &mut cycles) };
+    }
+
     pub fn emulate_many(sims: &mut [Sim]) {
         let mut cycles = 20_000_000;
         let count = sims.len() as c_uint;