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#+title: 2D Game Engine Development Plan — Mixed & Fun Milestones
* Milestone 1: A World That Moves
** Map & Rendering
*** DONE Update map parser to read layer information. :graphics:
*** DONE Render multiple tile layers (simple implementation). :graphics:
** Input & Player Basics
*** DONE Build a simple input-state map (keys pressed/held). :input:
*** TODO Create basic player entity (plist data + type). :entities:
*** TODO Move the player 1 pixel each frame to test update loop. :entities:update:
** Scene & Entity System
*** TODO Implement a basic `scene` that holds a list of entities. :scene:
*** TODO Write `scene-add-entity!` and `scene-foreach-entity`. :scene:
* Milestone 2: Seeing & Controlling Things
** Sprite Rendering
*** DONE Load a texture and draw a static sprite. :graphics:sprites:
*** TODO Add sprite reference to player entity plist. :entities:
** Input → Actions
*** TODO Create input→action map (e.g. W→move-up). :input:actions:
*** TODO Update player velocity based on actions. :physics:
** Entity Utilities
*** TODO Write plist helpers for entity data (ref, set!, update!). :entities:plist:
* Milestone 3: A Moving Camera, Gravity & Scene Loading
** Camera
*** TODO Implement a basic camera struct with x/y. :graphics:camera:
*** TODO Offset rendering by camera position. :graphics:camera:
** Basic Physics
*** TODO Implement gravity for entities with :gravity? #t. :physics:gravity:
*** TODO Update player and camera positions each frame. :physics:
** Scene Loading
*** TODO Make a function to load a scene from a tilemap name + prefab list. :scene_management:
*** TODO Add a per-entity :init function for initialization. :entities:
* Milestone 4: Collisions, Prefabs & Simple Enemies
** Collision
*** TODO AABB overlap function. :physics:collision:
*** TODO Detect collisions between player and solid tiles. :physics:tilemap:
** Prefabs
*** TODO Write a basic “prefab file” returning plist definitions. :prefabs:
*** TODO Implement `instantiate-prefab` to produce entities. :prefabs:
** AI Basics
*** TODO Add simple FSM fields (:state, :next-state) to an enemy entity. :ai:
*** TODO Implement “idle → patrol” logic in enemy update. :ai:
* Milestone 5: Animated Tiles, Entity Collisions & More Player Feel
** Graphics Polish
*** TODO Add tile animation metadata to tileset. :graphics:animation:
*** TODO Draw correct animation frame based on time. :graphics:animation:
** Entity × Entity Collision
*** TODO Detect overlaps between dynamic entities. :physics:collision:
*** TODO Push colliding entities apart by simple resolution. :physics:collision:
** Player Polish
*** TODO Add :speed and :jump-strength fields to player plist. :entities:
*** TODO Make movement feel nicer by tweaking acceleration/velocity. :physics:
* Milestone 6: Audio, UI & Better Enemy Logic
** Audio
*** TODO Bind essential SDL2_mixer functions via FFI. :audio:
*** TODO Initialize mixer and load sound resources. :audio:
*** TODO Implement `(play-sound 'jump)` API. :audio:
** UI
*** TODO Integrate SDL2_ttf and render debug text. :ui:
*** TODO Draw player position as on-screen text. :ui:
** Enemy Expansion
*** TODO Implement “patrol direction switch” when hitting tile edges. :ai:
*** TODO Let enemy react to player proximity (simple check). :ai:
* Milestone 7: Pathfinding, Better Scenes, More Polish
** Pathfinding
*** TODO Implement A* node structure and open/closed sets. :ai:pathfinding:
*** TODO Implement basic A* grid search. :ai:pathfinding:
** Rendering Polish
*** TODO Add optional parallax background layer. :graphics:
*** TODO Add simple camera smoothing (lerp toward player). :graphics:camera:
** Scene & Data-Driven Logic
*** TODO Add hot-reloading of prefab files. :engine:data:
*** TODO Add level transitions (change scenes). :scene_management:
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