download-manager/README.md: Update driver info

doc/download-manager/README.md

@@ -105,6 +105,8 @@ Where:
         - `karting`
         - `road`
         - `speedway`
+    - For drivers, it must be one of the available robots, such as
+      `simplix` or `usr`.
 - `author`: defines the author(s) for an asset. Speed Dreams shall not
 perform any specific actions based on the value of this string.
 - `license`: defines the license covering the asset. Speed Dreams shall not
@@ -129,14 +131,24 @@ the download manager. The URL must point to an image file with an extension
 known to the `GfTexReadImageFromFile` function. The URL does not have to point
 to the same web server hosting the asset database.
 - `directory`: defines the directory where the asset shall be stored.
-    - Cars are stored into `data/cars/models/<directory>`.
-    - Tracks are stored into `data/tracks/<category>/<directory>`.
-    - Drivers are stored into `data/drivers/<directory>`.
+`datadir` depends on how Speed Dreams is configured during build and
+installation and matches the value returned by the `GfDataDir` function,
+whereas the `localdir` directory is calculated at run-time by Speed Dreams
+and matches the value returned by the `GfLocalDir` function.
+    - Cars are stored into `<datadir>/cars/models/<directory>`.
+    - Tracks are stored into `<datadir>/tracks/<category>/<directory>`.
+    - Drivers are stored into `<localdir>/drivers/<category>/<index>`.
+    Since Speed Dreams refers to drivers by their indexes, once extracted
+    it will rename `directory` to the next integer `index` available in the
+    directory.
 - `revision`: an integer that defines the revision of an asset. This value is
 used as a basic mechanism to inform users about updates. The download manager
 shall write the currently downloaded revision into a file called `.revision`
 inside the asset directory.
 
+> **TODO:** future releases will also store cars and tracks into `localdir`
+> instead of `datadir`.
+
 ## Asset file structure
 
 An asset must be defined as a [ZIP file](https://en.wikipedia.org/wiki/.zip)

doc/download-manager/assets.example.json

@@ -70,17 +70,17 @@
     ],
     "drivers": [
         {
-            "name": "dandroid 36gp",
-            "category": "36gp",
+            "name": "Ren Suzuki",
+            "category": "dandroid",
             "author": "?",
             "license": "Free Art License",
-            "url": "http://localhost:8000/dandroid_36GP.zip",
-            "hash": "8484a548efbcf8c081a14c76f9a12ba7e7220909146452fdde223f9f8f951372",
+            "url": "http://localhost:8000/ren-suzuki.zip",
+            "hash": "458128211a8f7215060b54b8ebf953ed8692181aed69a47c9280f20730f67665",
             "hashtype": "sha256",
-            "size": "22333413",
-            "thumbnail": "http://localhost:8000/dandroid_36GP.png",
-            "directory": "dandroid_36GP",
-            "revision": "0"
+            "size": "668",
+            "thumbnail": "http://localhost:8000/logo.png",
+            "directory": "ren-suzuki",
+            "revision": "3"
         }
     ]
 }