From 3098926e2193b98ee65ca6be6f37c8997662d462 Mon Sep 17 00:00:00 2001
From: En Yi <en.yi@tutanota.com>
Date: Wed, 3 Sep 2025 21:29:27 +0800
Subject: [PATCH] Persist level completion

Changelog:
- Set and save level completion on hitting the exit
- Load level completion on program start
---
 .gitignore            |  1 +
 main.c                |  2 ++
 scenes/game_scene.c   |  2 +-
 scenes/game_systems.c |  5 +++++
 scenes/save_data.c    | 19 ++++++++++++++++---
 scenes/save_data.h    |  4 ++--
 6 files changed, 27 insertions(+), 6 deletions(-)

diff --git a/.gitignore b/.gitignore
index 139c170..26110c9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@ web/
 compile_commands.json
 .gdb_history
 heaptrack.*
+save.dat
diff --git a/main.c b/main.c
index 8091b22..c2f5ee8 100644
--- a/main.c
+++ b/main.c
@@ -4,6 +4,7 @@
 #include "ent_impl.h"
 #include "mempool.h"
 #include "constants.h"
+#include "save_data.h"
 #include <stdio.h>
 #include <math.h>
 #define N_SCENES 4
@@ -29,6 +30,7 @@ int main(void)
     SetConfigFlags(FLAG_WINDOW_RESIZABLE);
     init_engine(&engine, (Vector2){screenWidth, screenHeight});
     SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
+    load_savedata();
 #ifndef NDEBUG
     load_from_infofile("res/assets.info.raw", &engine.assets);
     init_player_creation("res/player_spr.info", &engine.assets);
diff --git a/scenes/game_scene.c b/scenes/game_scene.c
index ee1035a..a8c793e 100644
--- a/scenes/game_scene.c
+++ b/scenes/game_scene.c
@@ -531,7 +531,7 @@ static void at_level_start(Scene_t* scene)
 static void at_level_complete(Scene_t* scene)
 {
     LevelSceneData_t* data = &(CONTAINER_OF(scene, LevelScene_t, scene)->data);
-    set_level_completed(data->current_level, true);
+    
     data->sm.fractional += scene->delta_time;
     if (data->sm.fractional > 1.0f)
     {
diff --git a/scenes/game_systems.c b/scenes/game_systems.c
index 05599c7..353f9a1 100644
--- a/scenes/game_systems.c
+++ b/scenes/game_systems.c
@@ -11,6 +11,8 @@
 #include "EC.h"
 
 #include "constants.h"
+
+#include "save_data.h"
 #include <stdio.h>
 
 #define CRITICAL_WATER_OVERLAP 0.4f
@@ -2157,6 +2159,9 @@ void level_end_detection_system(Scene_t* scene)
 
                 }
                 destroy_entity(scene, &lvl_scene->data.tilemap, p_other_ent);
+
+                set_level_completed(lvl_scene->data.current_level, true);
+                writeout_savedata();
                 change_level_state(&lvl_scene->data, LEVEL_STATE_COMPLETE);
 
 
diff --git a/scenes/save_data.c b/scenes/save_data.c
index a65fbd7..e8e87bb 100644
--- a/scenes/save_data.c
+++ b/scenes/save_data.c
@@ -1,5 +1,8 @@
 #include "save_data.h"
 #include "constants.h"
+#include "raylib.h"
+
+#include <string.h>
 
 // Bit flags for level completion.
 // Expect 30 levels.
@@ -9,14 +12,24 @@
 #define NUMBER_OF_BYTES 4
 static uint8_t completion_flags[NUMBER_OF_BYTES] = {0};
 
-int load_savedata(uint8_t* bytes, size_t len)
+int load_savedata()
 {
+    int len = 0;
+    unsigned char* data = LoadFileData(SAVE_FILE_NAME, &len);
+    if (data != NULL)
+    {
+        if (len == NUMBER_OF_BYTES)
+        {
+            memcpy(completion_flags, data, NUMBER_OF_BYTES);
+        }
+        UnloadFileData(data);
+    }
     return 0;
 }
 
-int writeout_savedata(uint8_t* bytes, size_t len)
+int writeout_savedata()
 {
-    return 0;
+    return SaveFileData(SAVE_FILE_NAME, completion_flags, NUMBER_OF_BYTES)? 0 : 1;
 }
 
 bool is_level_completed(uint32_t level_num)
diff --git a/scenes/save_data.h b/scenes/save_data.h
index 6c07285..5d1d270 100644
--- a/scenes/save_data.h
+++ b/scenes/save_data.h
@@ -15,8 +15,8 @@
 #include <stdint.h>
 #include <stdbool.h>
 
-int load_savedata(uint8_t* bytes, size_t len);
-int writeout_savedata(uint8_t* bytes, size_t len);
+int load_savedata();
+int writeout_savedata();
 
 bool is_level_completed(uint32_t level_num);
 void set_level_completed(uint32_t level_num, bool complete);