39 lines
1.2 KiB
TypeScript
39 lines
1.2 KiB
TypeScript
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import type { Vec3 } from "../math/Vec3"
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import type { MeshBatch } from "../render/ChunkBuilder"
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import type { Collider } from "../world/Collider"
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/** Static content recipe. Concrete game prefabs implement this engine contract and
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* are referenced as objects, never through a closed content-kind registry. */
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export type Prefab<State> = {
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position: (state: State) => Vec3
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bakeNear: (state: State, batch: MeshBatch) => void
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bakeFar?: (state: State, batch: MeshBatch) => void
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collider?: (state: State) => Collider | null
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}
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/** Type-erased placed prefab consumed during level compilation only. */
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export type PlacedPrefab = {
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position: Vec3
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bakeNear: (batch: MeshBatch) => void
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bakeFar?: (batch: MeshBatch) => void
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collider: Collider | null
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}
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export namespace Prefab {
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export function place<State>(
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definition: Prefab<State>,
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state: State,
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): PlacedPrefab {
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const bakeFar = definition.bakeFar
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return {
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position: definition.position(state),
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bakeNear: (batch) => definition.bakeNear(state, batch),
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bakeFar:
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bakeFar === undefined
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? undefined
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: (batch) => bakeFar(state, batch),
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collider: definition.collider?.(state) ?? null,
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}
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}
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}
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