Add Roadmap

Roadmap.md

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+## Core
+
+- ~~Add and implement interfaces for systems (ISystem, IUpdatableSystem, etc.)~~
+- ~~Minimize amount of possible null references.~~
+- ~~TextDataResource providing a convenient wrapper around TOML data files.~~
+- ~~Add documentation for common classes.~~
+- ~~Hot reloading of resources.~~
+- Separate render and update thread.
+
+## I/O
+
+- ~~Use GUIDs and string ID maps for fetching resources instead of string IDs alone.~~
+- ~~Reimplement unloading.~~
+- Finalize ResourceManager and ResourceLoader APIs for 1.0.
+- Add async API for ResourceManager.
+- ~~Virtual file system.~~
+- Custom PAK format using the VFS implementation.
+- (stretch goal) Streamed resource loading.
+
+## Serialization
+
+- Serialize attribute.
+- Add automatic serialization of resources through source generation and System.Text.Json.
+  - Make sure this serialization system works well with CLR and NativeAOT.
+- ~~Provide means for fetching key/value configuration (INI? TOML?)~~
+  - Expose some sort of ConfigFile class for safe key/value configuration fetching.
+
+## Rendering
+
+- ~~API for drawing textured quads~~
+- ~~Camera API~~
+- Arbitrary mesh rendering API.
+- Create WebGPU renderer (StandardRenderSystem)
+
+## Audio
+
+- Use SoLoud as a default sound engine.
+- Integrate FMOD.
+
+## Misc
+
+- ~~Asset manager~~
+- ~~Separate engine and game into separate projects~~
+- ~~Particle system 2.0~~
+  - ~~Reduce the size of Particle struct by infering most parameters through lifetime.~~
+  - ~~Reduce cache misses by utilizing SoA.~~
+  - ~~SIMD acceleration.~~
+  - ~~Creating and removing emitters.~~
+
+## SceneGraph module
+
+- Full overhaul using Entity Component architecture (not to be mistaken with ECS).
+- Layers (sorting mechanism)
+- Save/load scenes from file
+
+## Input
+
+- ~~Action system~~
+- Nicer input mapping API using code.
+- Make action system use an InputMap resource instead.
+- Gamepad support
+
+## Diagnostics
+
+- Implement Profiler class.
+- Generate a Speedscope report.
+- Collect reports for systems
+  - Game
+  - Render
+  - Audio
+  - ResourceManager
+  - UI
+  - Particles
+
+## UI
+
+- ~~Layout~~
+  - ~~Containers~~
+    - ~~VerticalContainer~~
+    - ~~HorizontalContainer~~
+    - ~~GridContainer~~
+    - ~~FlexContainer~~
+  - ~~Positioning (anchors)~~
+- ~~Move layouting to Render instead of Update, use Update for input.~~
+- Input propagation
+  - ~~Pass input to widgets.~~
+  - Add element focus logic, make them focusable with action inputs.
+- Basic input elements (~~button~~, text field, toggle).
+- Styling
+  - ~~Style sheet~~
+  - ~~Add style settings for UI panels (for buttons, labels, etc.).~~
+  - ~~Parse StyleSheet from TOML file.~~
+  - Animated styles
+  - (stretch goal) Style variables
+  - Find a way to reference external assets in the style (fonts, textures).
+  - Create a default style for widgets.