proc.fields

The value types of the procedural-generation type system beside the Geometry: Field<T>, PointCloud, Population, Texture, Material, Prefab (also Template), Bundle and Ramp. Part of @builtin::systems.procgen.proc; each is re-exported on proc (proc.Field, proc.Texture, ...).

• Field<T>: a lazy per-element value. Field.constant(t, values), Field.fn(t, stride, f), Field.buffer(t, stride, buf), Field.context(t, stride, class, name) (an attribute of the domain it is evaluated over) and Field.gpu(...) (backed by a GPU buffer); :sample(id) answers the stride components, :materialize(count) a flat count*stride array, and :release() frees a GPU-backed field. Field.transform(offset, orient, scale) is a per-element transform whose three parts are fields of their own, so each compiles to the device; :transformParts() hands them back. fields.over(domain, fn, ...) runs fn with domain as the domain fields are evaluated over.
• PointCloud: the value a .procNode input declared PointCloud receives (proc.substrate.toPointCloud); every other input, and every op, takes points as a Geometry (proc.geometry.new). PointCloud.new(positions) (flat stride-3 array); :count(), :position(id), :setAttribute(name, field) / :getAttribute(name) / :attributeNames(), and detail attributes through :setDetail / :getDetail.
• Population: live instanced-draw registrations (Population.new({ draws, recipe })); :count(), :setParent(entity), :bytes() and :destroy().
• Texture: an RGBA image: Texture.new(width, height, data), Texture.solid(width, height, rgba), Texture.bytes(...), or Texture.gpu(...) for one the device holds; :dimensions(), :pixel(id), :cpu().
• Material: a record of a shader, its property values and its texture slots: Material.pbr(opts), Material.shader(opts), :setTexture(slot, ref).
• Prefab / Bundle: entity records (Prefab.new(records), Bundle.new(records), :count()).
• Ramp: values keyed along [0, 1] (Ramp.new(t, positions, values, interpolation?), :sample(t)).

Every value carries a __proc_type tag that proc.types.typeOf reads ("Field<Vec3>", "PointCloud", "Population", "Texture", ...).