broken PPU imp

src/bus.rs

@@ -16,6 +16,22 @@ impl NesBus {
     pub fn new(cart: Cartridge) -> Self {
         Self { ram: [0; 0x800], cart, ppu: Ppu::new(), openbus: 0 }
     }
+
+    pub fn tick_ppu(&mut self, cycles: u64) {
+        self.ppu.tick(&mut self.cart, cycles);
+    }
+    pub fn frame_done(&self) -> bool {
+        self.ppu.frame_done()
+    }
+    pub fn take_nmi(&mut self) -> bool {
+        self.ppu.take_nmi()
+    }
+    pub fn framebuffer(&self) -> &[u8] {
+        self.ppu.framebuffer()
+    }
+    pub fn begin_frame(&mut self) {
+        self.ppu.begin_frame();
+    }
 }
 
 impl Bus for NesBus {