update ROADMAP

ROADMAP.md

@@ -1,74 +1,139 @@
 # Roadmap
 
-## `Milestone I`
+## `Milestone I (basic math and utils)`
 
 - ### `basic math`
+
   - [x] `vec2, vec3, vec4`
+
   - [x] `mat2, mat3, mat4`
+
   - [x] `unit<T,Tag>`
+
   - [x] `basic math functions`
     ```
     clamp, min, max, approximately etc.
     ```
+
   - [x] `basic trigonometric functions and constants`
     ```
     pi, sin, cos, to_deg, to_rad etc.
     ```
 
 - ### `basic utils`
+
   - [x] `path`
     ```
     functions to manipulating paths in a portable way
     ```
+
   - [x] `color, color32`
+
   - [x] `basic string functions`
     ```
     unicode convertions, wildcard patterns, type safe format
     ```
+
   - [x] `timer and time functions`
+
   - [x] `image, image loaders`
     ```
     basic true color formats
     internal: g8, ga8, rgb8, rgba8
     external: png, jpg, tga
     ```
+
   - [x] `streams and native file system`
+
   - [x] `thread pool and async tasks`
 
-## `Milestone II`
+## `Milestone II (basic core)`
 
 - ### `basic core`
+
+  - [x] `engine`
+    ```
+    game loop
+    frame timers
+    core initialization
+    ```
+
   - [x] `logger`
     ```
     levels, sinks
     ```
+
   - [x] `basic input system`
     ```
     events, listeners, polling
     devices: mouse, keyboard
     ```
+
   - [x] `basic window system`
     ```
     GLFW, Windows, Linux, Mac OS X
     windowed and fullscreen modes
     ```
+
   - [x] `basic render system`
     ```
     OpenGL only
     index and vertex buffers, render state,
     textures, blends, pixel and vertex shaders
     ```
+
   - [x] `virtual file system`
     ```
     path aliases, archives, async loading
     ```
-  - [ ] `basic resource manager`
+
+## `Milestone III (basic high)`
+
+- ### `basic high`
+
+  - [ ] `library`
     ```
+    resource management, abstract loaders
     groups, dependencies, async loading
     ```
 
-## `Milestone III`
+  - [ ] `resources`
+    ```
+    meshes, shaders, textures, materials
+    ```
 
-```
-Coming Soon...
-```
+  - [ ] `scene graph`
+    ```
+    nodes, scenes
+    parent child relationship, bounding boxes, event bubbling
+    ```
+
+## `Milestone IV (advanced high)`
+
+- ### `advanced high`
+
+  - [ ] `sprites`
+    ```
+    static and frame-by-frame animations
+    ```
+
+  - [ ] `ECS`
+    ```
+    basic entity component system
+    component processing and joins
+    ```
+
+  - [ ] `animations`
+    ```
+    tweeners and spine runtime
+    ```
+
+  - [ ] `labels`
+    ```
+    ttf, bmfont
+    ```
+
+  - [ ] `scripting`
+    ```
+    lua runtime and bindings
+    ```