import type { IViewportLike } from "../../Maths/math.like";
import type { Nullable } from "../../types";
/**
 * Defines the interface used by objects containing a viewport (like a camera)
 */
interface IViewportOwnerLike {
    /**
     * Gets or sets the viewport
     */
    viewport: IViewportLike;
}
declare module "../../Engines/abstractEngine" {
    interface AbstractEngine {
        /**
         * Gets the HTML element used to attach event listeners
         * @returns a HTML element
         */
        getInputElement(): Nullable<HTMLElement>;
        /**
         * Gets the client rect of the HTML canvas attached with the current webGL context
         * @returns a client rectangle
         */
        getRenderingCanvasClientRect(): Nullable<ClientRect>;
        /**
         * Gets the client rect of the HTML element used for events
         * @returns a client rectangle
         */
        getInputElementClientRect(): Nullable<ClientRect>;
        /**
         * Gets current aspect ratio
         * @param viewportOwner defines the camera to use to get the aspect ratio
         * @param useScreen defines if screen size must be used (or the current render target if any)
         * @returns a number defining the aspect ratio
         */
        getAspectRatio(viewportOwner: IViewportOwnerLike, useScreen?: boolean): number;
        /**
         * Gets current screen aspect ratio
         * @returns a number defining the aspect ratio
         */
        getScreenAspectRatio(): number;
        /**
         * Toggle full screen mode
         * @param requestPointerLock defines if a pointer lock should be requested from the user
         */
        switchFullscreen(requestPointerLock: boolean): void;
        /**
         * Enters full screen mode
         * @param requestPointerLock defines if a pointer lock should be requested from the user
         */
        enterFullscreen(requestPointerLock: boolean): void;
        /**
         * Exits full screen mode
         */
        exitFullscreen(): void;
        /** @internal */
        _onPointerLockChange: () => void;
        /** @internal */
        _verifyPointerLock(): void;
    }
}
export {};