Reintroduce multiple maps: per-map chunk directories + map_t name/mapSetMap

Move chunk assets from a single flat assetsraw/chunks (and assets/chunks)
into per-map assetsraw/maps/<map>/chunks (assets/maps/<map>/chunks), so
terrain mesh/model output no longer collides across maps sharing chunk
coordinates. map_t gains a name[MAP_NAME_MAX] field plus mapSetMap()/
mapIsLoaded() (checks name[0] == '\0') in place of the old bool loaded
flag; mapInit() now just resets state and mapSetMap() does the chunk
grid load. Updated the chunk asset tool and the map editor's dev
server/client to match.

src/dusk/rpg/overworld/map.c

@@ -28,7 +28,25 @@ void mapChunkLoadingSlotClear(chunk_t *chunk) {
 
 errorret_t mapInit() {
   memoryZero(&MAP, sizeof(map_t));
-  MAP.loaded = true;
+  errorOk();
+}
+
+bool_t mapIsLoaded() {
+  return MAP.name[0] != '\0';
+}
+
+errorret_t mapSetMap(const char_t *map) {
+  assertNotNull(map, "mapSetMap: map name cannot be NULL");
+  assertStrLenMax(map, MAP_NAME_MAX, "Map name too long");
+
+  if(mapIsLoaded()) {
+    for(chunkindex_t i = 0; i < MAP_CHUNK_COUNT; i++) {
+      mapChunkUnload(&MAP.chunks[i]);
+    }
+  }
+
+  memoryZero(&MAP, sizeof(map_t));
+  stringCopy(MAP.name, map, MAP_NAME_MAX);
 
   chunkindex_t i = 0;
   for(chunkunit_t z = 0; z < MAP_CHUNK_DEPTH; z++) {
@@ -47,10 +65,6 @@ errorret_t mapInit() {
   errorOk();
 }
 
-bool_t mapIsLoaded() {
-  return MAP.loaded;
-}
-
 errorret_t mapPositionSet(const chunkpos_t newPos) {
   if(!mapIsLoaded()) errorThrow("No map loaded");
   if(chunkPositionIsEqual(newPos, MAP.chunkPosition)) errorOk();
@@ -132,6 +146,7 @@ errorret_t mapDispose() {
   for(chunkindex_t i = 0; i < MAP_CHUNK_COUNT; i++) {
     mapChunkUnload(&MAP.chunks[i]);
   }
+  MAP.name[0] = '\0';
   errorOk();
 }
 
@@ -203,10 +218,11 @@ errorret_t mapChunkLoad(chunk_t *chunk) {
 
   chunk->meshCount = 0;
 
-  char_t name[64];
+  char_t name[MAP_FILE_PATH_MAX];
   stringFormat(
     name, sizeof(name),
-    "chunks/%d_%d_%d.dcf",
+    "maps/%s/chunks/%d_%d_%d.dcf",
+    MAP.name,
     (int32_t)chunk->position.x,
     (int32_t)chunk->position.y,
     (int32_t)chunk->position.z
@@ -241,10 +257,11 @@ void mapChunkLoadNext() {
     MAP.loadQueueCount--;
     MAP.loadingChunks[slot] = chunk;
 
-    char_t name[64];
+    char_t name[MAP_FILE_PATH_MAX];
     stringFormat(
       name, sizeof(name),
-      "chunks/%d_%d_%d.dcf",
+      "maps/%s/chunks/%d_%d_%d.dcf",
+      MAP.name,
       (int32_t)chunk->position.x,
       (int32_t)chunk->position.y,
       (int32_t)chunk->position.z

src/dusk/rpg/overworld/map.h

@@ -12,12 +12,18 @@
 
 #define MAP_FILE_PATH_MAX 128
 
+// Buffer size for a map's name, including the null terminator - so map
+// names are at most 9 characters.
+#define MAP_NAME_MAX 10
+
 // Number of chunks that may be mid-load (asset locked & awaiting onLoaded/
 // onError) at the same time - everything past this waits in loadQueue.
 #define MAP_CHUNK_LOAD_CONCURRENCY 2
 
 typedef struct map_s {
-  bool_t loaded;
+  // Name of the currently loaded map, or an empty string if none is
+  // loaded (see mapIsLoaded).
+  char_t name[MAP_NAME_MAX];
 
   chunk_t chunks[MAP_CHUNK_COUNT];
   chunk_t *chunkOrder[MAP_CHUNK_COUNT];
@@ -31,19 +37,30 @@ typedef struct map_s {
 extern map_t MAP;
 
 /**
- * Initializes the map.
- * 
+ * Initializes the map subsystem. No map is loaded until mapSetMap is
+ * called.
+ *
  * @return An error code.
  */
 errorret_t mapInit();
 
 /**
  * Checks if a map is loaded.
- * 
+ *
  * @return true if a map is loaded, false otherwise.
  */
 bool_t mapIsLoaded();
 
+/**
+ * Sets the active map by name, unloading the previously loaded map (if
+ * any) first, then starts loading the new map's chunks around chunk
+ * position (0, 0, 0).
+ *
+ * @param map The map's name, at most MAP_NAME_MAX - 1 characters.
+ * @return An error code.
+ */
+errorret_t mapSetMap(const char_t *map);
+
 /**
  * Updates the map.
  *

src/dusk/rpg/rpg.c

@@ -31,10 +31,9 @@ errorret_t rpgInit(void) {
   cutsceneSystemInit();
   errorChain(mapInit());
   rpgCameraInit();
-  
 
   // Init test world
-  errorChain(mapPositionSet((chunkpos_t){ 0, 0, 0 }));
+  errorChain(mapSetMap("overworld"));
 
   // The player is the one entity that isn't sourced from map/chunk data -
   // every other entity (NPCs, items) and map area comes from the loaded