chore: support for disabling dma

frontends/sdl/src/main.rs

@@ -471,6 +471,9 @@ struct Args {
     #[arg(long, default_value_t = false)]
     no_apu: bool,
 
+    #[arg(long, default_value_t = false)]
+    no_dma: bool,
+
     #[arg(long, default_value_t = false)]
     no_timer: bool,
 
@@ -490,6 +493,7 @@ fn main() {
     let device = build_device(&args.device);
     game_boy.set_ppu_enabled(!args.no_ppu);
     game_boy.set_apu_enabled(!args.no_apu);
+    game_boy.set_dma_enabled(!args.no_dma);
     game_boy.set_timer_enabled(!args.no_timer);
     game_boy.attach_serial(device);
     game_boy.load(true);

src/gb.rs

@@ -643,6 +643,15 @@ impl GameBoy {
         (*self.gbc).borrow_mut().set_apu_enabled(value);
     }
 
+    pub fn dma_enabled(&self) -> bool {
+        self.dma_enabled
+    }
+
+    pub fn set_dma_enabled(&mut self, value: bool) {
+        self.dma_enabled = value;
+        (*self.gbc).borrow_mut().set_dma_enabled(value);
+    }
+
     pub fn timer_enabled(&self) -> bool {
         self.timer_enabled
     }