add frame advance (#549)

parallel-rdp/interface.cpp

@@ -207,6 +207,9 @@ bool sdl_event_filter(void *userdata, SDL_Event *event)
 		case SDL_SCANCODE_RIGHTBRACKET:
 			callback.raise_volume = true;
 			break;
+		case SDL_SCANCODE_SLASH:
+			callback.frame_advance = true;
+			break;
 		case SDL_SCANCODE_0:
 		case SDL_SCANCODE_1:
 		case SDL_SCANCODE_2:
@@ -536,6 +539,7 @@ CALL_BACK rdp_check_callback()
 	callback.load_state = false;
 	callback.lower_volume = false;
 	callback.raise_volume = false;
+	callback.frame_advance = false;
 	return return_value;
 }
 

parallel-rdp/interface.hpp

@@ -34,6 +34,7 @@ extern "C"
 		bool lower_volume;
 		bool raise_volume;
 		bool paused;
+		bool frame_advance;
 		uint32_t save_state_slot;
 	} CALL_BACK;
 

src/ui/video.rs

@@ -144,7 +144,7 @@ pub fn check_callback(device: &mut device::Device) -> bool {
             speed_limiter_toggled = true;
             device.vi.enable_speed_limiter = callback.enable_speedlimiter;
         }
-        while callback.paused {
+        while callback.paused && !callback.frame_advance {
             std::thread::sleep(std::time::Duration::from_secs_f64(1.0 / 60.0));
             unsafe { sdl3_sys::events::SDL_PumpEvents() };
             callback = unsafe { rdp_check_callback() };