import type { N8AOPostPass } from "n8ao";
import { type EffectProviderResult, PostProcessingEffect } from "../PostProcessingEffect.js";
import { VolumeParameter } from "../VolumeParameter.js";
/**See (N8AO documentation)[https://github.com/N8python/n8ao] */
export declare enum ScreenSpaceAmbientOcclusionN8QualityMode {
    Performance = 0,
    Low = 1,
    Medium = 2,
    High = 3,
    Ultra = 4
}
/** [ScreenSpaceAmbientOcclusionN8](https://engine.needle.tools/docs/api/ScreenSpaceAmbientOcclusionN8) is a screen space ambient occlusion (SSAO) effect.
 * Ambient Occlusion is a shading method used to calculate how exposed each point in a scene is to ambient lighting.
 * The effect enhances the depth and realism of 3D scenes by simulating the soft shadows that occur in crevices, corners, and areas where objects are close to each other.
 * This implementation uses the N8AO library to provide high-quality SSAO with various quality settings.
 * @summary Screen Space Ambient Occlusion (SSAO) Post-Processing Effect
 * @category Effects
 * @group Components
 * @link [N8AO documentation](https://github.com/N8python/n8ao)
 */
export declare class ScreenSpaceAmbientOcclusionN8 extends PostProcessingEffect {
    get typeName(): string;
    get pass(): N8AOPostPass;
    gammaCorrection: boolean;
    /** The most important parameter for your ambient occlusion effect.
     * Controls the radius/size of the ambient occlusion in world units.
     * Should be set to how far you want the occlusion to extend from a given object.
     * Set it too low, and AO becomes an edge detector.
     * Too high, and the AO becomes "soft" and might not highlight the details you want.
     * The radius should be one or two magnitudes less than scene scale:
     * if your scene is 10 units across, the radius should be between 0.1 and 1. If its 100, 1 to 10.
     * @default 1
     */
    aoRadius: VolumeParameter;
    /** The second most important parameter for your ambient occlusion effect.
     * Controls how fast the ambient occlusion fades away with distance in proportion to its radius.
     * Defaults to 1, and behind-the-scenes, is a calculated as a ratio of your radius (0.2 * distanceFalloff is the size used for attenuation).
     * Decreasing it reduces "haloing" artifacts and improves the accuracy of your occlusion,
     * but making it too small makes the ambient occlusion disappear entirely.
     * @default 1
     */
    falloff: VolumeParameter;
    /** A purely artistic control for the intensity of the AO - runs the ao through the function pow(ao, intensity),
     * which has the effect of darkening areas with more ambient occlusion.
     * Useful to make the effect more pronounced.
     * An intensity of 2 generally produces soft ambient occlusion that isn't too noticeable,
     * whereas one of 5 produces heavily prominent ambient occlusion.
     * @default 1
     */
    intensity: VolumeParameter;
    /** The color of the ambient occlusion. By default, it is black, but it can be changed to any color
     * to offer a crude approximation of global illumination.
     * Recommended in scenes where bounced light has a uniform "color",
     * for instance a scene that is predominantly lit by a blue sky.
     * The color is expected to be in the sRGB color space, and is automatically converted to linear space for you.
     * Keep the color pretty dark for sensible results.
     * @default new Color(0, 0, 0)
     */
    color: VolumeParameter;
    /** If you want the AO to calculate the radius based on screen space, you can do so by setting configuration.screenSpaceRadius to true.
     * This is useful for scenes where the camera is moving across different scales a lot,
     * or for scenes where the camera is very close to the objects.
     * @default false
     */
    screenspaceRadius: boolean;
    /**
     * The quality of the ambient occlusion effect.
     * @default ScreenSpaceAmbientOcclusionN8QualityMode.Medium
     */
    quality: ScreenSpaceAmbientOcclusionN8QualityMode;
    private _ssao?;
    onValidate(): void;
    onCreateEffect(): EffectProviderResult;
}