From a5c0db824baa42348e12d5a70fca94c9707e5547 Mon Sep 17 00:00:00 2001
From: Sven Balzer <4653051+Kyuusokuna@users.noreply.github.com>
Date: Sat, 27 Sep 2025 08:38:46 +0200
Subject: [PATCH] add a version to map files

---
 assets/maps/map.sv | Bin 3336 -> 3340 bytes
 src/main.cpp       |  19 +++++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/assets/maps/map.sv b/assets/maps/map.sv
index 076f241b33fd545281a027ae098a59fb08ba82d8..17251b7e539b7dc10ee4405f59a07818ba5fba08 100644
GIT binary patch
delta 12
TcmeB>>XBk$WME*}z`+Xu5I_PG

delta 8
PcmeB?>X6#V!odpw3%vpp

diff --git a/src/main.cpp b/src/main.cpp
index fa56dd6..5e21371 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -176,6 +176,8 @@ struct Instance {
 static Instance player_instance = {{ 0.0f, 0.0f }};
 
 struct Map {
+    Uint32 version;
+
     Sint32 width;
     Sint32 height;
 
@@ -281,6 +283,8 @@ static WGPUBuffer create_buffer(WGPUBufferUsage usage, Uint32 num_bytes, void *d
     return buffer;
 }
 
+#define MAP_FILE_VERSION (1u)
+
 static bool save_map(Map map) {
     char path[256] = ASSETS_PATH "maps/";
     SDL_strlcat(path, map.name, SDL_arraysize(path));
@@ -292,6 +296,11 @@ static bool save_map(Map map) {
     }
     defer(SDL_CloseIO(file));
 
+    if (!SDL_WriteU32LE(file, MAP_FILE_VERSION)) {
+        log_error("Failed to write version to map file.");
+        return false;
+    }
+
     if (!SDL_WriteS32LE(file, map.width)) {
         log_error("Failed to write width to map file.");
         return false;
@@ -334,6 +343,16 @@ static bool load_map(const char *name, Map *result) {
     defer(SDL_CloseIO(file));
     result->name = SDL_strdup(name);
 
+    if (!SDL_ReadU32LE(file, &result->version)) {
+        log_error("Failed read version from map file.");
+        return false;
+    }
+
+    if (result->version > MAP_FILE_VERSION) {
+        log_error("Map file version (%u) is higher than the highest supported.", result->version);
+        return false;
+    }
+
     if (!SDL_ReadS32LE(file, &result->width)) {
         log_error("Failed read width from map file.");
         return false;