Support notifying latches

snes/cpu/mmio/mmio.cpp

@@ -33,6 +33,7 @@ void CPU::mmio_w2183(uint8 data) {
 //strobing $4016.d0 affects both controller port latches.
 //$4017 bit 0 writes are ignored.
 void CPU::mmio_w4016(uint8 data) {
+  if(data&1) interface->notifyLatched();
   input.port1->latch(data & 1);
   input.port2->latch(data & 1);
 }

snes/cpu/timing/joypad.cpp

@@ -7,6 +7,7 @@ void CPU::step_auto_joypad_poll() {
 
     if(status.auto_joypad_active && status.auto_joypad_poll) {
       if(status.auto_joypad_counter == 0) {
+        interface->notifyLatched();
         input.port1->latch(1);
         input.port2->latch(1);
         input.port1->latch(0);

snes/interface/interface.cpp

@@ -28,4 +28,9 @@ time_t Interface::randomSeed()
   return time(0);
 }
 
+void Interface::notifyLatched()
+{
+  //Nothing.
+}
+
 }

snes/interface/interface.hpp

@@ -7,6 +7,7 @@ struct Interface {
   virtual void message(const string &text);
   virtual time_t currentTime();
   virtual time_t randomSeed();
+  virtual void notifyLatched();
 };
 
 extern Interface *interface;