#Milky2018/mgstudio

mgstudio-engine is a small Bevy-inspired runtime core implemented in MoonBit.

#Text2d pipeline (engine-led)

Text rendering is implemented in the guest (engine) and only relies on the host runtime for I/O and GPU texture updates:

Shaping / line-breaking / BiDi: Milky2018/moon_cosmic
Glyph rasterization: Milky2018/moon_swash
Font bytes: host provides asset_load_font + asset_font_bytes_* (read-only)
Glyph atlas upload: host provides asset_create_dynamic_texture and asset_update_texture_region_bytes

The legacy host APIs font_rasterize_glyph / font_measure_advance are kept only for backwards-compatibility and are not used by the current engine text pipeline.

#Physics2d hooks

physics2d exposes Rapier hooks in a Bevy-like split:

Global callback config (Physics2dHooksConfig) for hook functions.
World-resource callback config (Physics2dHooksConfig) for hook functions.
Per-collider opt-in (ActiveHooks2d) to enable hook categories.

Example:

let cfg = @physics2d.physics2d_hooks_config(world)
@physics2d.physics2d_hooks_set_config(
  world,
  @physics2d.Physics2dHooksConfig::{
    ..cfg,
    filter_contact_pair: Some(fn(_bodies, _colliders, h1, h2) {
      let e1 = @physics2d.physics2d_hook_entity_from_collider_handle(h1)
      let e2 = @physics2d.physics2d_hook_entity_from_collider_handle(h2)
      // Return false to ignore this contact pair.
      !(e1 is Some(_) && e2 is Some(_))
    }),
  },
)

try! world.set(
  collider_entity,
  @physics2d.ActiveHooks2d::new(@collision.ActiveHooks::filter_contact_pairs()),
)

Note: mgstudio reserves Rapier collider user_data for ECS ownership identity. Do not overwrite it in gameplay code. Hook code should resolve entities via physics2d_hook_entity_from_collider_handle(...).

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