diff --git a/src/dusk/asset/loader/assetloader.c b/src/dusk/asset/loader/assetloader.c
index 121ab02c..5987246f 100644
--- a/src/dusk/asset/loader/assetloader.c
+++ b/src/dusk/asset/loader/assetloader.c
@@ -12,7 +12,7 @@ assetloadercallbacks_t ASSET_LOADER_CALLBACKS[ASSET_LOADER_TYPE_COUNT] = {
 
   [ASSET_LOADER_TYPE_MESH] = {
     .loadSync = assetMeshLoaderSync,
-    .loadAsync = NULL,
+    .loadAsync = assetMeshLoaderAsync,
     .dispose = assetMeshDispose
   },
 
@@ -24,19 +24,19 @@ assetloadercallbacks_t ASSET_LOADER_CALLBACKS[ASSET_LOADER_TYPE_COUNT] = {
 
   [ASSET_LOADER_TYPE_TILESET] = {
     .loadSync = assetTilesetLoaderSync,
-    .loadAsync = NULL,
+    .loadAsync = assetTilesetLoaderAsync,
     .dispose = assetTilesetDispose
   },
 
   [ASSET_LOADER_TYPE_LOCALE] = {
     .loadSync = assetLocaleLoaderSync,
-    .loadAsync = NULL,
+    .loadAsync = assetLocaleLoaderAsync,
     .dispose = assetLocaleDispose
   },
 
   [ASSET_LOADER_TYPE_JSON] = {
     .loadSync = assetJsonLoaderSync,
-    .loadAsync = NULL,
+    .loadAsync = assetJsonLoaderAsync,
     .dispose = assetJsonDispose
   },
 };
diff --git a/src/dusk/asset/loader/display/assetmeshloader.c b/src/dusk/asset/loader/display/assetmeshloader.c
index aa9d418a..4bc13c37 100644
--- a/src/dusk/asset/loader/display/assetmeshloader.c
+++ b/src/dusk/asset/loader/display/assetmeshloader.c
@@ -12,29 +12,28 @@
 #include "asset/loader/assetloading.h"
 #include "asset/loader/assetentry.h"
 
-errorret_t assetMeshLoaderSync(assetloading_t *loading) {
+errorret_t assetMeshLoaderAsync(assetloading_t *loading) {
   assertNotNull(loading, "Loading cannot be NULL");
-  assertTrue(loading->type == ASSET_LOADER_TYPE_MESH, "Invalid type.");
+
+  if(loading->loading.mesh.state != ASSET_MESH_LOADING_STATE_READ_FILE) {
+    errorOk();
+  }
 
   assetmeshoutput_t *out = &loading->entry->data.mesh;
   assetfile_t *file = &loading->loading.mesh.file;
   assetmeshinputaxis_t axis = loading->entry->input->mesh;
 
-  assetLoaderErrorChain(loading, assetFileInit(
-    file, loading->entry->name, NULL, NULL
-  ));
+  assetLoaderErrorChain(loading, assetFileInit(file, loading->entry->name, NULL, NULL));
   assetLoaderErrorChain(loading, assetFileOpen(file));
 
-  // Skip the 80-byte STL header
+  // Skip the 80-byte STL header.
   assetLoaderErrorChain(loading, assetFileRead(file, NULL, 80));
   if(file->lastRead != 80) {
     assetLoaderErrorThrow(loading, "Failed to skip STL header.");
   }
 
   uint32_t triangleCount;
-  assetLoaderErrorChain(
-    loading, assetFileRead(file, &triangleCount, sizeof(uint32_t))
-  );
+  assetLoaderErrorChain(loading, assetFileRead(file, &triangleCount, sizeof(uint32_t)));
   if(file->lastRead != sizeof(uint32_t)) {
     assetLoaderErrorThrow(loading, "Failed to read tri count");
   }
@@ -76,9 +75,7 @@ errorret_t assetMeshLoaderSync(assetloading_t *loading) {
       verts[i * 3 + j].uv[1] = 0.0f;
 
       for(uint8_t k = 0; k < 3; k++) {
-        verts[i * 3 + j].pos[k] = endianLittleToHostFloat(
-          triData.positions[j][k]
-        );
+        verts[i * 3 + j].pos[k] = endianLittleToHostFloat(triData.positions[j][k]);
       }
 
       switch(axis) {
@@ -124,12 +121,42 @@ errorret_t assetMeshLoaderSync(assetloading_t *loading) {
   }
   assetFileDispose(file);
 
-  ret = meshInit(
-    &out->mesh, MESH_PRIMITIVE_TYPE_TRIANGLES, triangleCount * 3, verts
+  loading->loading.mesh.triangleCount = triangleCount;
+  loading->loading.mesh.state = ASSET_MESH_LOADING_STATE_CREATE_MESH;
+  loading->entry->state = ASSET_ENTRY_STATE_PENDING_SYNC;
+  errorOk();
+}
+
+errorret_t assetMeshLoaderSync(assetloading_t *loading) {
+  assertNotNull(loading, "Loading cannot be NULL");
+  assertTrue(loading->type == ASSET_LOADER_TYPE_MESH, "Invalid type.");
+
+  switch(loading->loading.mesh.state) {
+    case ASSET_MESH_LOADING_STATE_INITIAL:
+      loading->loading.mesh.state = ASSET_MESH_LOADING_STATE_READ_FILE;
+      loading->entry->state = ASSET_ENTRY_STATE_PENDING_ASYNC;
+      errorOk();
+      break;
+
+    case ASSET_MESH_LOADING_STATE_CREATE_MESH:
+      break;
+
+    default:
+      errorOk();
+  }
+
+  assetmeshoutput_t *out = &loading->entry->data.mesh;
+  assertNotNull(out->vertices, "Mesh vertices should have been loaded by now.");
+
+  errorret_t ret = meshInit(
+    &out->mesh,
+    MESH_PRIMITIVE_TYPE_TRIANGLES,
+    loading->loading.mesh.triangleCount * 3,
+    out->vertices
   );
   if(errorIsNotOk(ret)) {
     loading->entry->state = ASSET_ENTRY_STATE_ERROR;
-    memoryFree(verts);
+    memoryFree(out->vertices);
     out->vertices = NULL;
     assetLoaderErrorChain(loading, ret);
   }
diff --git a/src/dusk/asset/loader/display/assetmeshloader.h b/src/dusk/asset/loader/display/assetmeshloader.h
index 0eab0c3a..c803c526 100644
--- a/src/dusk/asset/loader/display/assetmeshloader.h
+++ b/src/dusk/asset/loader/display/assetmeshloader.h
@@ -25,8 +25,17 @@ typedef enum {
 
 typedef assetmeshinputaxis_t assetmeshloaderinput_t;
 
+typedef enum {
+  ASSET_MESH_LOADING_STATE_INITIAL,
+  ASSET_MESH_LOADING_STATE_READ_FILE,
+  ASSET_MESH_LOADING_STATE_CREATE_MESH,
+  ASSET_MESH_LOADING_STATE_DONE
+} assetmeshloadingstate_t;
+
 typedef struct {
   assetfile_t file;
+  assetmeshloadingstate_t state;
+  uint32_t triangleCount;
 } assetmeshloaderloading_t;
 
 typedef struct {
@@ -44,5 +53,6 @@ typedef struct {
 
 assertStructSize(assetmeshstltriangle_t, 50);
 
+errorret_t assetMeshLoaderAsync(assetloading_t *loading);
 errorret_t assetMeshLoaderSync(assetloading_t *loading);
 errorret_t assetMeshDispose(assetentry_t *entry);
diff --git a/src/dusk/asset/loader/display/assettilesetloader.c b/src/dusk/asset/loader/display/assettilesetloader.c
index 99ba5378..3803baf8 100644
--- a/src/dusk/asset/loader/display/assettilesetloader.c
+++ b/src/dusk/asset/loader/display/assettilesetloader.c
@@ -12,67 +12,97 @@
 #include "asset/loader/assetloading.h"
 #include "asset/loader/assetentry.h"
 
+errorret_t assetTilesetLoaderAsync(assetloading_t *loading) {
+  assertNotNull(loading, "Loading cannot be NULL");
+
+  if(loading->loading.tileset.state != ASSET_TILESET_LOADING_STATE_READ_FILE) {
+    errorOk();
+  }
+
+  assertNull(loading->loading.tileset.data, "Data already defined?");
+
+  assetfile_t *file = &loading->loading.tileset.file;
+  assetLoaderErrorChain(loading, assetFileInit(file, loading->entry->name, NULL, NULL));
+
+  uint8_t *data = memoryAllocate(file->size);
+  assetLoaderErrorChain(loading, assetFileOpen(file));
+  assetLoaderErrorChain(loading, assetFileRead(file, data, file->size));
+  assetLoaderErrorChain(loading, assetFileClose(file));
+  assetLoaderErrorChain(loading, assetFileDispose(file));
+  assertTrue(file->lastRead == file->size, "Failed to read entire tileset file.");
+
+  loading->loading.tileset.data = data;
+  loading->loading.tileset.state = ASSET_TILESET_LOADING_STATE_PARSE;
+  loading->entry->state = ASSET_ENTRY_STATE_PENDING_SYNC;
+  errorOk();
+}
+
 errorret_t assetTilesetLoaderSync(assetloading_t *loading) {
   assertNotNull(loading, "Loading cannot be NULL");
   assertTrue(loading->type == ASSET_LOADER_TYPE_TILESET, "Invalid type.");
 
-  assetfile_t *file = &loading->loading.tileset.file;
+  switch(loading->loading.tileset.state) {
+    case ASSET_TILESET_LOADING_STATE_INITIAL:
+      loading->loading.tileset.state = ASSET_TILESET_LOADING_STATE_READ_FILE;
+      loading->entry->state = ASSET_ENTRY_STATE_PENDING_ASYNC;
+      errorOk();
+      break;
+
+    case ASSET_TILESET_LOADING_STATE_PARSE:
+      break;
+
+    default:
+      errorOk();
+  }
+
+  uint8_t *data = loading->loading.tileset.data;
+  assertNotNull(data, "Tileset data should have been loaded by now.");
+
   tileset_t *out = &loading->entry->data.tileset;
 
-  assetLoaderErrorChain(
-    loading, assetFileInit(file, loading->entry->name, NULL, NULL)
-  );
-
-  uint8_t *entire = memoryAllocate(file->size);
-  assetLoaderErrorChain(loading, assetFileOpen(file));
-  assetLoaderErrorChain(loading, assetFileRead(file, entire, file->size));
-  assetLoaderErrorChain(loading, assetFileClose(file));
-  assetLoaderErrorChain(loading, assetFileDispose(file));
-  assertTrue(file->lastRead == file->size, "Failed to read entire file.");
-
-  if(entire[0] != 'D' || entire[1] != 'T' || entire[2] != 'F') {
-    memoryFree(entire);
+  if(data[0] != 'D' || data[1] != 'T' || data[2] != 'F') {
+    memoryFree(data);
     assetLoaderErrorThrow(loading, "Invalid tileset header");
   }
 
-  if(entire[3] != 0x00) {
-    memoryFree(entire);
+  if(data[3] != 0x00) {
+    memoryFree(data);
     assetLoaderErrorThrow(loading, "Unsupported tileset version");
   }
 
-  out->tileWidth = endianLittleToHost16(*(uint16_t *)(entire + 4));
-  out->tileHeight = endianLittleToHost16(*(uint16_t *)(entire + 6));
-  out->columns = endianLittleToHost16(*(uint16_t *)(entire + 8));
-  out->rows = endianLittleToHost16(*(uint16_t *)(entire + 10));
+  out->tileWidth = endianLittleToHost16(*(uint16_t *)(data + 4));
+  out->tileHeight = endianLittleToHost16(*(uint16_t *)(data + 6));
+  out->columns = endianLittleToHost16(*(uint16_t *)(data + 8));
+  out->rows = endianLittleToHost16(*(uint16_t *)(data + 10));
 
   if(out->tileWidth == 0) {
-    memoryFree(entire);
+    memoryFree(data);
     assetLoaderErrorThrow(loading, "Tile width cannot be 0");
   }
-
   if(out->tileHeight == 0) {
-    memoryFree(entire);
+    memoryFree(data);
     assetLoaderErrorThrow(loading, "Tile height cannot be 0");
   }
   if(out->columns == 0) {
-    memoryFree(entire);
+    memoryFree(data);
     assetLoaderErrorThrow(loading, "Column count cannot be 0");
   }
   if(out->rows == 0) {
-    memoryFree(entire);
+    memoryFree(data);
     assetLoaderErrorThrow(loading, "Row count cannot be 0");
   }
 
-  out->uv[0] = endianLittleToHostFloat(*(float *)(entire + 16));
-  out->uv[1] = endianLittleToHostFloat(*(float *)(entire + 20));
+  out->uv[0] = endianLittleToHostFloat(*(float *)(data + 16));
+  out->uv[1] = endianLittleToHostFloat(*(float *)(data + 20));
 
   if(out->uv[1] < 0.0f || out->uv[1] > 1.0f) {
-    memoryFree(entire);
+    memoryFree(data);
     assetLoaderErrorThrow(loading, "Invalid v0 value in tileset");
   }
 
   out->tileCount = out->columns * out->rows;
-  memoryFree(entire);
+  memoryFree(data);
+  loading->loading.tileset.data = NULL;
 
   loading->entry->state = ASSET_ENTRY_STATE_LOADED;
   errorOk();
diff --git a/src/dusk/asset/loader/display/assettilesetloader.h b/src/dusk/asset/loader/display/assettilesetloader.h
index 6456e423..646b4064 100644
--- a/src/dusk/asset/loader/display/assettilesetloader.h
+++ b/src/dusk/asset/loader/display/assettilesetloader.h
@@ -16,11 +16,45 @@ typedef struct {
   void *nothing;
 } assettilesetloaderinput_t;
 
+typedef enum {
+  ASSET_TILESET_LOADING_STATE_INITIAL,
+  ASSET_TILESET_LOADING_STATE_READ_FILE,
+  ASSET_TILESET_LOADING_STATE_PARSE,
+  ASSET_TILESET_LOADING_STATE_DONE
+} assettilesetloadingstate_t;
+
 typedef struct {
   assetfile_t file;
+  assettilesetloadingstate_t state;
+
+  uint8_t *data;
 } assettilesetloaderloading_t;
 
 typedef tileset_t assettilesetoutput_t;
 
+/**
+ * Asynchronous loader for tileset assets. Reads the raw DTF file bytes into
+ * the loading buffer so the sync phase can parse without blocking the main
+ * thread on I/O.
+ *
+ * @param loading Loading information for the asset being loaded.
+ * @return Error code indicating success or failure of the load operation.
+ */
+errorret_t assetTilesetLoaderAsync(assetloading_t *loading);
+
+/**
+ * Synchronous loader for tileset assets. Parses the DTF binary previously
+ * read by the async phase and populates the output tileset_t.
+ *
+ * @param loading Loading information for the asset being loaded.
+ * @return Error code indicating success or failure of the load operation.
+ */
 errorret_t assetTilesetLoaderSync(assetloading_t *loading);
+
+/**
+ * Disposer for tileset assets.
+ *
+ * @param entry Asset entry containing the tileset to dispose.
+ * @return Error code indicating success or failure of the dispose operation.
+ */
 errorret_t assetTilesetDispose(assetentry_t *entry);
diff --git a/src/dusk/asset/loader/json/assetjsonloader.c b/src/dusk/asset/loader/json/assetjsonloader.c
index 2194622d..8ff8e501 100644
--- a/src/dusk/asset/loader/json/assetjsonloader.c
+++ b/src/dusk/asset/loader/json/assetjsonloader.c
@@ -11,40 +11,63 @@
 #include "asset/loader/assetloading.h"
 #include "asset/loader/assetentry.h"
 
-errorret_t assetJsonLoaderSync(assetloading_t *loading) {
+errorret_t assetJsonLoaderAsync(assetloading_t *loading) {
   assertNotNull(loading, "Loading cannot be NULL");
-  assertTrue(loading->type == ASSET_LOADER_TYPE_JSON, "Invalid type.");
+
+  if(loading->loading.json.state != ASSET_JSON_LOADING_STATE_READ_FILE) {
+    errorOk();
+  }
+
+  assertNull(loading->loading.json.buffer, "Buffer already defined?");
 
   assetfile_t *file = &loading->loading.json.file;
-  assetLoaderErrorChain(
-    loading, assetFileInit(file, loading->entry->name, NULL, NULL)
-  );
+  assetLoaderErrorChain(loading, assetFileInit(file, loading->entry->name, NULL, NULL));
 
   if(file->size > ASSET_JSON_FILE_SIZE_MAX) {
     assetLoaderErrorThrow(loading, "JSON exceeds maximum allowed size");
   }
 
   uint8_t *buffer = memoryAllocate(file->size);
-  assetLoaderErrorChain(
-    loading, assetFileOpen(file)
-  );
-  assetLoaderErrorChain(
-    loading, assetFileRead(file, buffer, file->size)
-  );
+  assetLoaderErrorChain(loading, assetFileOpen(file));
+  assetLoaderErrorChain(loading, assetFileRead(file, buffer, file->size));
   assertTrue(file->lastRead == file->size, "Failed to read entire JSON file.");
-  assetLoaderErrorChain(
-    loading, assetFileClose(file)
-  );
-  assetLoaderErrorChain(
-    loading, assetFileDispose(file)
-  );
+  assetLoaderErrorChain(loading, assetFileClose(file));
+  assetLoaderErrorChain(loading, assetFileDispose(file));
+
+  loading->loading.json.buffer = buffer;
+  loading->loading.json.state = ASSET_JSON_LOADING_STATE_PARSE;
+  loading->entry->state = ASSET_ENTRY_STATE_PENDING_SYNC;
+  errorOk();
+}
+
+errorret_t assetJsonLoaderSync(assetloading_t *loading) {
+  assertNotNull(loading, "Loading cannot be NULL");
+  assertTrue(loading->type == ASSET_LOADER_TYPE_JSON, "Invalid type.");
+
+  switch(loading->loading.json.state) {
+    case ASSET_JSON_LOADING_STATE_INITIAL:
+      loading->loading.json.state = ASSET_JSON_LOADING_STATE_READ_FILE;
+      loading->entry->state = ASSET_ENTRY_STATE_PENDING_ASYNC;
+      errorOk();
+      break;
+
+    case ASSET_JSON_LOADING_STATE_PARSE:
+      break;
+
+    default:
+      errorOk();
+  }
+
+  uint8_t *buffer = loading->loading.json.buffer;
+  assertNotNull(buffer, "JSON buffer should have been loaded by now.");
 
   loading->entry->data.json = yyjson_read(
     (char *)buffer,
-    file->size,
+    loading->loading.json.file.size,
     YYJSON_READ_ALLOW_COMMENTS | YYJSON_READ_ALLOW_TRAILING_COMMAS
   );
   memoryFree(buffer);
+  loading->loading.json.buffer = NULL;
 
   if(!loading->entry->data.json) {
     assetLoaderErrorThrow(loading, "Failed to parse JSON");
diff --git a/src/dusk/asset/loader/json/assetjsonloader.h b/src/dusk/asset/loader/json/assetjsonloader.h
index af3be98d..cb0f5d73 100644
--- a/src/dusk/asset/loader/json/assetjsonloader.h
+++ b/src/dusk/asset/loader/json/assetjsonloader.h
@@ -15,10 +15,22 @@ typedef struct assetloading_s assetloading_t;
 typedef struct assetentry_s assetentry_t;
 
 typedef struct { void *nothing; } assetjsonloaderinput_t;
+
+typedef enum {
+  ASSET_JSON_LOADING_STATE_INITIAL,
+  ASSET_JSON_LOADING_STATE_READ_FILE,
+  ASSET_JSON_LOADING_STATE_PARSE,
+  ASSET_JSON_LOADING_STATE_DONE
+} assetjsonloadingstate_t;
+
 typedef struct {
   assetfile_t file;
+  assetjsonloadingstate_t state;
+  uint8_t *buffer;
 } assetjsonloaderloading_t;
+
 typedef yyjson_doc * assetjsonoutput_t;
 
+errorret_t assetJsonLoaderAsync(assetloading_t *loading);
 errorret_t assetJsonLoaderSync(assetloading_t *loading);
 errorret_t assetJsonDispose(assetentry_t *entry);
diff --git a/src/dusk/asset/loader/locale/assetlocaleloader.c b/src/dusk/asset/loader/locale/assetlocaleloader.c
index e4ba51ef..d6840df5 100644
--- a/src/dusk/asset/loader/locale/assetlocaleloader.c
+++ b/src/dusk/asset/loader/locale/assetlocaleloader.c
@@ -14,9 +14,12 @@
 #include "asset/loader/assetloading.h"
 #include "asset/loader/assetentry.h"
 
-errorret_t assetLocaleLoaderSync(assetloading_t *loading) {
+errorret_t assetLocaleLoaderAsync(assetloading_t *loading) {
   assertNotNull(loading, "Loading cannot be NULL");
-  assertTrue(loading->type == ASSET_LOADER_TYPE_LOCALE, "Invalid type.");
+
+  if(loading->loading.locale.state != ASSET_LOCALE_LOADER_STATE_LOAD_HEADER) {
+    errorOk();
+  }
 
   assetlocalefile_t *localeFile = &loading->entry->data.locale;
   memoryZero(localeFile, sizeof(assetlocalefile_t));
@@ -27,6 +30,29 @@ errorret_t assetLocaleLoaderSync(assetloading_t *loading) {
   assetLoaderErrorChain(loading, assetLocaleGetString(localeFile, "", 0, buffer, sizeof(buffer)));
   assetLoaderErrorChain(loading, assetLocaleParseHeader(localeFile, buffer, sizeof(buffer)));
 
+  loading->loading.locale.state = ASSET_LOCALE_LOADER_STATE_DONE;
+  loading->entry->state = ASSET_ENTRY_STATE_PENDING_SYNC;
+  errorOk();
+}
+
+errorret_t assetLocaleLoaderSync(assetloading_t *loading) {
+  assertNotNull(loading, "Loading cannot be NULL");
+  assertTrue(loading->type == ASSET_LOADER_TYPE_LOCALE, "Invalid type.");
+
+  switch(loading->loading.locale.state) {
+    case ASSET_LOCALE_LOADER_STATE_INITIAL:
+      loading->loading.locale.state = ASSET_LOCALE_LOADER_STATE_LOAD_HEADER;
+      loading->entry->state = ASSET_ENTRY_STATE_PENDING_ASYNC;
+      errorOk();
+      break;
+
+    case ASSET_LOCALE_LOADER_STATE_DONE:
+      break;
+
+    default:
+      errorOk();
+  }
+
   loading->entry->state = ASSET_ENTRY_STATE_LOADED;
   errorOk();
 }
diff --git a/src/dusk/asset/loader/locale/assetlocaleloader.h b/src/dusk/asset/loader/locale/assetlocaleloader.h
index 34079393..abd51b03 100644
--- a/src/dusk/asset/loader/locale/assetlocaleloader.h
+++ b/src/dusk/asset/loader/locale/assetlocaleloader.h
@@ -14,8 +14,16 @@ typedef struct assetentry_s assetentry_t;
 /** Input passed to the locale loader — currently unused. */
 typedef struct { void *nothing; } assetlocaleloaderinput_t;
 
+typedef enum {
+  ASSET_LOCALE_LOADER_STATE_INITIAL,
+  ASSET_LOCALE_LOADER_STATE_LOAD_HEADER,
+  ASSET_LOCALE_LOADER_STATE_DONE
+} assetlocaleloaderstate_t;
+
 /** Per-slot scratch data used while the locale file is loading. */
-typedef struct { void *nothing; } assetlocaleloaderloading_t;
+typedef struct {
+  assetlocaleloaderstate_t state;
+} assetlocaleloaderloading_t;
 
 /** Maximum number of distinct plural forms a locale file may declare. */
 #define ASSET_LOCALE_FILE_PLURAL_FORM_COUNT 6
@@ -96,10 +104,19 @@ typedef struct {
 typedef assetlocalefile_t assetlocaleoutput_t;
 
 /**
- * Synchronous loader callback. Opens and validates the locale file, reads the
- * PO header, and parses plural-form rules. Sets entry state to
- * `ASSET_ENTRY_STATE_LOADED` on success or `ASSET_ENTRY_STATE_ERROR` on
- * failure.
+ * Asynchronous loader callback. Opens the locale file, reads the PO header,
+ * and parses plural-form rules. All I/O happens here so the main thread is
+ * not blocked. Sets entry state to `ASSET_ENTRY_STATE_PENDING_SYNC` on
+ * success or `ASSET_ENTRY_STATE_ERROR` on failure.
+ *
+ * @param loading The loading slot for this asset entry.
+ * @return OK on success, error otherwise.
+ */
+errorret_t assetLocaleLoaderAsync(assetloading_t *loading);
+
+/**
+ * Synchronous loader callback. Confirms the async phase completed and marks
+ * the entry as `ASSET_ENTRY_STATE_LOADED`.
  *
  * @param loading The loading slot for this asset entry.
  * @return OK on success, error otherwise.