bevy/notes/outline.md

Bevy Outline

High Level

• ECS at its core (but only where needed)
• Simple api backed by flexible systems
  • ex: PBR renderer built on a render graph system
• Flexbox ui
  • simple, standard, good implementations exist
• 100% rust (except for the few cases where this is impossible)
• Batteries included
  • 2d/3d rendering, ui, physics, networking, etc
• Editor: also a "game"
  • dogfood components
• Fast app compile times (< 5 seconds)

Dependencies

• Legion ecs
• wgfx-rs
• nalgebra
• nphysics/ncollide

Outline

• Core
  • Shared
    • Types
      • enum PropertyValue
        • DATATYPE_WRAPPERS_HERE
        • Analog: godot's Variant
      • struct Property
        • Description: Dynamic data
          • Ex: exported to editor, uniforms in shaders
        • Tags: HashSet<string>
      • struct Texture
    • Components
      • Parent
        • Children Vec<EntityId>
      • Properties
        • HashMap<string, Property>
      • Mesh
      • Armature
      • Material
    • Systems
      • UpdateArmatureTransforms
      • SyncPropertiesToMaterialUniforms
  • 3d
    • Components
      • Transform
      • GlobalTransform
      • PhysicsBody
      • CollisionShape
      • RigidBody
    • Systems
      • CalculateGlobalTransform
        • Dep: Child, GlobalTransform, Transform
      • UpdateCollisions/NCollide
        • Dep: CollisionShape, PhysicsBody, GlobalTransform
      • UpdateRigidBodies/NCollide
        • Dep: PhysicsBody, RigidBody, GlobalTransform
  • 2d
    • Components
      • Transform2d
      • GlobalTransform2d
      • Element
      • PhysicsBody2d
      • CollisionShape2d
      • RigidBody2d
    • Systems
      • CalculateGlobalTransform2d
        • Dep: Child, GlobalTransform2d, Transform2d
      • UpdateCollisions2d/NCollide
        • Dep: CollisionShape2d, PhysicsBody2d, GlobalTransform2d
      • UpdateRigidBodies2d/NCollide
        • Dep: PhysicsBody2d, RigidBody2d, GlobalTransform2d