add support for save state slots (#534)

* add support for save state slots

* add log

parallel-rdp/interface.cpp

@@ -200,6 +200,24 @@ bool sdl_event_filter(void *userdata, SDL_Event *event)
 		case SDL_SCANCODE_RIGHTBRACKET:
 			callback.raise_volume = true;
 			break;
+		case SDL_SCANCODE_0:
+		case SDL_SCANCODE_1:
+		case SDL_SCANCODE_2:
+		case SDL_SCANCODE_3:
+		case SDL_SCANCODE_4:
+		case SDL_SCANCODE_5:
+		case SDL_SCANCODE_6:
+		case SDL_SCANCODE_7:
+		case SDL_SCANCODE_8:
+		case SDL_SCANCODE_9:
+			if (event->key.mod & SDL_KMOD_ALT)
+			{
+				if (event->key.scancode == SDL_SCANCODE_0)
+					callback.save_state_slot = 0;
+				else
+					callback.save_state_slot = event->key.scancode - SDL_SCANCODE_1 + 1;
+			}
+			break;
 		default:
 			break;
 		}
@@ -289,6 +307,7 @@ void rdp_init(void *_window, GFX_INFO _gfx_info)
 	callback.emu_running = true;
 	callback.enable_speedlimiter = true;
 	callback.paused = false;
+	callback.save_state_slot = 0;
 	crop_letterbox = false;
 }
 

parallel-rdp/interface.hpp

@@ -34,6 +34,7 @@ extern "C"
 		bool lower_volume;
 		bool raise_volume;
 		bool paused;
+		uint32_t save_state_slot;
 	} CALL_BACK;
 
 	void rdp_init(void *_window, GFX_INFO _gfx_info);

src/ui.rs

@@ -32,6 +32,7 @@ pub struct Storage {
     pub save_type: Vec<storage::SaveTypes>,
     pub paths: storage::Paths,
     pub saves: storage::Saves,
+    pub save_state_slot: u32,
 }
 
 pub struct Video {
@@ -125,6 +126,7 @@ impl Ui {
                 joysticks,
             },
             storage: Storage {
+                save_state_slot: 0,
                 save_type: vec![],
                 paths: storage::Paths {
                     eep_file_path: std::path::PathBuf::new(),

src/ui/storage.rs

@@ -199,10 +199,13 @@ pub fn init(ui: &mut ui::Ui, rom: &[u8]) {
         .paths
         .savestate_file_path
         .clone_from(&states_path);
-    ui.storage
-        .paths
-        .savestate_file_path
-        .push(prefix.to_owned() + "-" + &ui.game_hash + ".state");
+    ui.storage.paths.savestate_file_path.push(
+        prefix.to_owned()
+            + "-"
+            + &ui.game_hash
+            + ".state"
+            + ui.storage.save_state_slot.to_string().as_str(),
+    );
 }
 
 pub fn load_saves(ui: &mut ui::Ui, netplay: &mut Option<netplay::Netplay>) {

src/ui/video.rs

@@ -143,6 +143,16 @@ pub fn check_callback(device: &mut device::Device) -> bool {
         }
     }
 
+    if device.ui.storage.save_state_slot != callback.save_state_slot {
+        println!("Switching save state slot to {}", callback.save_state_slot);
+        device.ui.storage.save_state_slot = callback.save_state_slot;
+        device
+            .ui
+            .storage
+            .paths
+            .savestate_file_path
+            .set_extension("state".to_owned() + callback.save_state_slot.to_string().as_str());
+    }
     if callback.lower_volume {
         ui::audio::lower_audio_volume(&mut device.ui);
     } else if callback.raise_volume {