/**
 * Performs the visibility culling for a {@link Renderer}: per-camera light visibility,
 * mesh-instance culling (request/execute) and shadow-caster culling. It holds the per-frame
 * culling state and operates on the renderer's shared state (lights, shadow renderers, light
 * atlas, stats) through a back-reference to the renderer.
 *
 * @ignore
 */
export class Culler {
    /**
     * @param {Renderer} renderer - The renderer that owns this culler.
     */
    constructor(renderer: Renderer);
    /**
     * A set of visible mesh instances which need further processing before being rendered, e.g.
     * skinning or morphing. Extracted during culling.
     *
     * @type {Set<MeshInstance>}
     */
    processingMeshInstances: Set<MeshInstance>;
    /**
     * The distinct cameras with mesh-instance cull requests registered for the current frame, in
     * registration order. Populated by {@link Culler#requestMeshInstanceCull} and drained by
     * {@link Culler#executeMeshInstanceCull}. Reused across frames to avoid per-frame allocation.
     *
     * @type {Camera[]}
     * @private
     */
    private _cullCameras;
    /**
     * A list of unique directional shadow casting lights for each enabled camera. This is generated
     * each frame during light culling.
     *
     * @type {Map<Camera, Array<Light>>}
     */
    cameraDirShadowLights: Map<Camera, Array<Light>>;
    /**
     * A mapping of a directional light to a camera, for which the shadow is currently valid. This
     * is cleared each frame, and updated each time a directional light shadow is rendered for a
     * camera, and allows us to manually schedule shadow passes when a new camera needs a shadow.
     *
     * @type {Map<Light, Camera>}
     */
    dirLightShadows: Map<Light, Camera>;
    /** @type {Renderer} */
    renderer: Renderer;
    /**
     * @param {Camera} camera - The camera used for culling.
     * @param {MeshInstance[]} drawCalls - Draw calls to cull.
     * @param {CulledInstances} culledInstances - Stores culled instances.
     */
    cullMeshInstances(camera: Camera, drawCalls: MeshInstance[], culledInstances: CulledInstances): void;
    /**
     * Culls a set of lights against a camera's frustum, marking the visible ones (and updating their
     * max screen size and physical-units flag). Directional lights are marked visible at the start
     * of the frame and are skipped here, so only local (omni / spot) lights are frustum tested. In
     * non-clustered lighting, a shadow-casting light with no shadow map allocated yet is also marked
     * visible so its shadow map gets allocated.
     *
     * @param {Camera} camera - The camera whose frustum the lights are culled against.
     * @param {Light[]} lights - The lights to cull (typically a layer's lights).
     */
    cullLights(camera: Camera, lights: Light[]): void;
    /**
     * Shadow map culling for directional and visible local lights visible meshInstances are
     * collected into light._renderData, and are marked as visible for directional lights also
     * shadow camera matrix is set up.
     *
     * @param {LayerComposition} comp - The layer composition.
     */
    cullShadowmaps(comp: LayerComposition): void;
    /**
     * After the frame graph is built and shadow casters are culled, account for shadow-map updates
     * and consume one-shot ({@link SHADOWUPDATE_THISFRAME}) requests for lights whose shadow
     * actually rendered this frame, reverting them to {@link SHADOWUPDATE_NONE}. A light that did
     * not render this frame (for example an off-screen local light) keeps its request, so the
     * shadow updates the next frame the light is rendered. Must run after both the frame graph build
     * and shadow-caster culling, so that `needsShadowRendering` (a pure predicate) reports the same
     * result to both before the update mode is changed here.
     */
    consumeOneShotShadows(): void;
    /**
     * Collects the set of shadow-casting directional lights for each camera into
     * {@link Culler#cameraDirShadowLights}, and ensures each such light has a shadow map allocated.
     * This is independent of mesh culling and camera frusta (it uses only the composition's cameras
     * and the layers' directional lights), so it can run before the frame graph is built. The
     * actual shadow-caster culling is done separately.
     *
     * @param {LayerComposition} comp - The layer composition.
     */
    collectDirectionalShadowLights(comp: LayerComposition): void;
    /**
     * Per-camera light visibility culling, light-atlas allocation and directional-shadow-light
     * collection. This is independent of mesh culling and the frame graph, so it runs before the
     * frame graph is built. The mesh and shadow-caster culling that depends on it is done later in
     * {@link Culler#cullComposition}.
     *
     * @param {LayerComposition} comp - The layer composition.
     */
    updateLightVisibility(comp: LayerComposition): void;
    /**
     * Registers a request to cull a layer's mesh instances for a camera in the current frame. The
     * culling itself is performed later, in a single batch, by
     * {@link Culler#executeMeshInstanceCull}. Requests are de-duplicated per (camera, layer), so
     * requesting the same pair more than once (e.g. for its opaque and transparent sub-layers) is
     * harmless.
     *
     * This lets the frame graph drive culling - each pass requests the (camera, layer) pairs it
     * will actually render - instead of culling every camera/layer combination in the composition.
     *
     * @param {Camera} camera - The camera to cull for.
     * @param {Layer} layer - The layer whose mesh instances should be culled.
     */
    requestMeshInstanceCull(camera: Camera, layer: Layer): void;
    /**
     * Performs all mesh-instance culling requested via {@link Culler#requestMeshInstanceCull} this
     * frame, then clears the request list. For each requested camera the precull event is fired
     * (before the frustum is refreshed, so a listener may still adjust the camera), the camera
     * frustum is updated, each requested layer is culled, and the postcull event is fired.
     *
     * The events are passed the owning camera component for a framework camera, or null for an
     * internal camera (shadow / reflection / picker), matching the documented precull/postcull
     * contract.
     */
    executeMeshInstanceCull(): void;
    /**
     * Visibility culling of meshInstances and shadow casters. Light visibility, the light atlas and
     * the directional-shadow-light collection are done earlier in
     * {@link Culler#updateLightVisibility}.
     *
     * @param {LayerComposition} comp - The layer composition.
     */
    cullComposition(comp: LayerComposition): void;
}
import type { MeshInstance } from '../mesh-instance.js';
import type { Camera } from '../camera.js';
import type { Light } from '../light.js';
import type { Renderer } from './renderer.js';
import type { CulledInstances } from '../layer.js';
import type { LayerComposition } from '../composition/layer-composition.js';
import type { Layer } from '../layer.js';