import type { Scene, IDisposable } from "../scene";
import { Observable } from "./observable";
/**
 * Defines the root class used to create scene optimization to use with SceneOptimizer
 * @description More details at https://doc.babylonjs.com/features/featuresDeepDive/scene/sceneOptimizer
 */
export declare class SceneOptimization {
    /**
     * Defines the priority of this optimization (0 by default which means first in the list)
     */
    priority: number;
    /**
     * Gets a string describing the action executed by the current optimization
     * @returns description string
     */
    getDescription(): string;
    /**
     * This function will be called by the SceneOptimizer when its priority is reached in order to apply the change required by the current optimization
     * @param scene defines the current scene where to apply this optimization
     * @param optimizer defines the current optimizer
     * @returns true if everything that can be done was applied
     */
    apply(scene: Scene, optimizer: SceneOptimizer): boolean;
    /**
     * Creates the SceneOptimization object
     * @param priority defines the priority of this optimization (0 by default which means first in the list)
     */
    constructor(
    /**
     * Defines the priority of this optimization (0 by default which means first in the list)
     */
    priority?: number);
}
/**
 * Defines an optimization used to reduce the size of render target textures
 * @description More details at https://doc.babylonjs.com/features/featuresDeepDive/scene/sceneOptimizer
 */
export declare class TextureOptimization extends SceneOptimization {
    /**
     * Defines the priority of this optimization (0 by default which means first in the list)
     */
    priority: number;
    /**
     * Defines the maximum sized allowed for textures (1024 is the default value). If a texture is bigger, it will be scaled down using a factor defined by the step parameter
     */
    maximumSize: number;
    /**
     * Defines the factor (0.5 by default) used to scale down textures bigger than maximum sized allowed.
     */
    step: number;
    /**
     * Gets a string describing the action executed by the current optimization
     * @returns description string
     */
    getDescription(): string;
    /**
     * Creates the TextureOptimization object
     * @param priority defines the priority of this optimization (0 by default which means first in the list)
     * @param maximumSize defines the maximum sized allowed for textures (1024 is the default value). If a texture is bigger, it will be scaled down using a factor defined by the step parameter
     * @param step defines the factor (0.5 by default) used to scale down textures bigger than maximum sized allowed.
     */
    constructor(
    /**
     * Defines the priority of this optimization (0 by default which means first in the list)
     */
    priority?: number, 
    /**
     * Defines the maximum sized allowed for textures (1024 is the default value). If a texture is bigger, it will be scaled down using a factor defined by the step parameter
     */
    maximumSize?: number, 
    /**
     * Defines the factor (0.5 by default) used to scale down textures bigger than maximum sized allowed.
     */
    step?: number);
    /**
     * This function will be called by the SceneOptimizer when its priority is reached in order to apply the change required by the current optimization
     * @param scene defines the current scene where to apply this optimization
     * @param optimizer defines the current optimizer
     * @returns true if everything that can be done was applied
     */
    apply(scene: Scene, optimizer: SceneOptimizer): boolean;
}
/**
 * Defines an optimization used to increase or decrease the rendering resolution
 * @description More details at https://doc.babylonjs.com/features/featuresDeepDive/scene/sceneOptimizer
 */
export declare class HardwareScalingOptimization extends SceneOptimization {
    /**
     * Defines the priority of this optimization (0 by default which means first in the list)
     */
    priority: number;
    /**
     * Defines the maximum scale to use (2 by default)
     */
    maximumScale: number;
    /**
     * Defines the step to use between two passes (0.5 by default)
     */
    step: number;
    private _currentScale;
    private _directionOffset;
    /**
     * Gets a string describing the action executed by the current optimization
     * @returns description string
     */
    getDescription(): string;
    /**
     * Creates the HardwareScalingOptimization object
     * @param priority defines the priority of this optimization (0 by default which means first in the list)
     * @param maximumScale defines the maximum scale to use (2 by default)
     * @param step defines the step to use between two passes (0.5 by default)
     */
    constructor(
    /**
     * Defines the priority of this optimization (0 by default which means first in the list)
     */
    priority?: number, 
    /**
     * Defines the maximum scale to use (2 by default)
     */
    maximumScale?: number, 
    /**
     * Defines the step to use between two passes (0.5 by default)
     */
    step?: number);
    /**
     * This function will be called by the SceneOptimizer when its priority is reached in order to apply the change required by the current optimization
     * @param scene defines the current scene where to apply this optimization
     * @param optimizer defines the current optimizer
     * @returns true if everything that can be done was applied
     */
    apply(scene: Scene, optimizer: SceneOptimizer): boolean;
}
/**
 * Defines an optimization used to remove shadows
 * @description More details at https://doc.babylonjs.com/features/featuresDeepDive/scene/sceneOptimizer
 */
export declare class ShadowsOptimization extends SceneOptimization {
    /**
     * Gets a string describing the action executed by the current optimization
     * @returns description string
     */
    getDescription(): string;
    /**
     * This function will be called by the SceneOptimizer when its priority is reached in order to apply the change required by the current optimization
     * @param scene defines the current scene where to apply this optimization
     * @param optimizer defines the current optimizer
     * @returns true if everything that can be done was applied
     */
    apply(scene: Scene, optimizer: SceneOptimizer): boolean;
}
/**
 * Defines an optimization used to turn post-processes off
 * @description More details at https://doc.babylonjs.com/features/featuresDeepDive/scene/sceneOptimizer
 */
export declare class PostProcessesOptimization extends SceneOptimization {
    /**
     * Gets a string describing the action executed by the current optimization
     * @returns description string
     */
    getDescription(): string;
    /**
     * This function will be called by the SceneOptimizer when its priority is reached in order to apply the change required by the current optimization
     * @param scene defines the current scene where to apply this optimization
     * @param optimizer defines the current optimizer
     * @returns true if everything that can be done was applied
     */
    apply(scene: Scene, optimizer: SceneOptimizer): boolean;
}
/**
 * Defines an optimization used to turn lens flares off
 * @description More details at https://doc.babylonjs.com/features/featuresDeepDive/scene/sceneOptimizer
 */
export declare class LensFlaresOptimization extends SceneOptimization {
    /**
     * Gets a string describing the action executed by the current optimization
     * @returns description string
     */
    getDescription(): string;
    /**
     * This function will be called by the SceneOptimizer when its priority is reached in order to apply the change required by the current optimization
     * @param scene defines the current scene where to apply this optimization
     * @param optimizer defines the current optimizer
     * @returns true if everything that can be done was applied
     */
    apply(scene: Scene, optimizer: SceneOptimizer): boolean;
}
/**
 * Defines an optimization based on user defined callback.
 * @description More details at https://doc.babylonjs.com/features/featuresDeepDive/scene/sceneOptimizer
 */
export declare class CustomOptimization extends SceneOptimization {
    /**
     * Callback called to apply the custom optimization.
     */
    onApply: (scene: Scene, optimizer: SceneOptimizer) => boolean;
    /**
     * Callback called to get custom description
     */
    onGetDescription: () => string;
    /**
     * Gets a string describing the action executed by the current optimization
     * @returns description string
     */
    getDescription(): string;
    /**
     * This function will be called by the SceneOptimizer when its priority is reached in order to apply the change required by the current optimization
     * @param scene defines the current scene where to apply this optimization
     * @param optimizer defines the current optimizer
     * @returns true if everything that can be done was applied
     */
    apply(scene: Scene, optimizer: SceneOptimizer): boolean;
}
/**
 * Defines an optimization used to turn particles off
 * @description More details at https://doc.babylonjs.com/features/featuresDeepDive/scene/sceneOptimizer
 */
export declare class ParticlesOptimization extends SceneOptimization {
    /**
     * Gets a string describing the action executed by the current optimization
     * @returns description string
     */
    getDescription(): string;
    /**
     * This function will be called by the SceneOptimizer when its priority is reached in order to apply the change required by the current optimization
     * @param scene defines the current scene where to apply this optimization
     * @param optimizer defines the current optimizer
     * @returns true if everything that can be done was applied
     */
    apply(scene: Scene, optimizer: SceneOptimizer): boolean;
}
/**
 * Defines an optimization used to turn render targets off
 * @description More details at https://doc.babylonjs.com/features/featuresDeepDive/scene/sceneOptimizer
 */
export declare class RenderTargetsOptimization extends SceneOptimization {
    /**
     * Gets a string describing the action executed by the current optimization
     * @returns description string
     */
    getDescription(): string;
    /**
     * This function will be called by the SceneOptimizer when its priority is reached in order to apply the change required by the current optimization
     * @param scene defines the current scene where to apply this optimization
     * @param optimizer defines the current optimizer
     * @returns true if everything that can be done was applied
     */
    apply(scene: Scene, optimizer: SceneOptimizer): boolean;
}
/**
 * Defines an optimization used to merge meshes with compatible materials
 * @description More details at https://doc.babylonjs.com/features/featuresDeepDive/scene/sceneOptimizer
 */
export declare class MergeMeshesOptimization extends SceneOptimization {
    private static _UpdateSelectionTree;
    /**
     * Gets or sets a boolean which defines if optimization octree has to be updated
     */
    static get UpdateSelectionTree(): boolean;
    /**
     * Gets or sets a boolean which defines if optimization octree has to be updated
     */
    static set UpdateSelectionTree(value: boolean);
    /**
     * Gets a string describing the action executed by the current optimization
     * @returns description string
     */
    getDescription(): string;
    private _canBeMerged;
    /**
     * This function will be called by the SceneOptimizer when its priority is reached in order to apply the change required by the current optimization
     * @param scene defines the current scene where to apply this optimization
     * @param optimizer defines the current optimizer
     * @param updateSelectionTree defines that the selection octree has to be updated (false by default)
     * @returns true if everything that can be done was applied
     */
    apply(scene: Scene, optimizer: SceneOptimizer, updateSelectionTree?: boolean): boolean;
}
/**
 * Defines a list of options used by SceneOptimizer
 * @description More details at https://doc.babylonjs.com/features/featuresDeepDive/scene/sceneOptimizer
 */
export declare class SceneOptimizerOptions {
    /**
     * Defines the target frame rate to reach (60 by default)
     */
    targetFrameRate: number;
    /**
     * Defines the interval between two checks (2000ms by default)
     */
    trackerDuration: number;
    /**
     * Gets the list of optimizations to apply
     */
    optimizations: SceneOptimization[];
    /**
     * Creates a new list of options used by SceneOptimizer
     * @param targetFrameRate defines the target frame rate to reach (60 by default)
     * @param trackerDuration defines the interval between two checks (2000ms by default)
     */
    constructor(
    /**
     * Defines the target frame rate to reach (60 by default)
     */
    targetFrameRate?: number, 
    /**
     * Defines the interval between two checks (2000ms by default)
     */
    trackerDuration?: number);
    /**
     * Add a new optimization
     * @param optimization defines the SceneOptimization to add to the list of active optimizations
     * @returns the current SceneOptimizerOptions
     */
    addOptimization(optimization: SceneOptimization): SceneOptimizerOptions;
    /**
     * Add a new custom optimization
     * @param onApply defines the callback called to apply the custom optimization (true if everything that can be done was applied)
     * @param onGetDescription defines the callback called to get the description attached with the optimization.
     * @param priority defines the priority of this optimization (0 by default which means first in the list)
     * @returns the current SceneOptimizerOptions
     */
    addCustomOptimization(onApply: (scene: Scene, optimizer: SceneOptimizer) => boolean, onGetDescription: () => string, priority?: number): SceneOptimizerOptions;
    /**
     * Creates a list of pre-defined optimizations aimed to reduce the visual impact on the scene
     * @param targetFrameRate defines the target frame rate (60 by default)
     * @returns a SceneOptimizerOptions object
     */
    static LowDegradationAllowed(targetFrameRate?: number): SceneOptimizerOptions;
    /**
     * Creates a list of pre-defined optimizations aimed to have a moderate impact on the scene visual
     * @param targetFrameRate defines the target frame rate (60 by default)
     * @returns a SceneOptimizerOptions object
     */
    static ModerateDegradationAllowed(targetFrameRate?: number): SceneOptimizerOptions;
    /**
     * Creates a list of pre-defined optimizations aimed to have a big impact on the scene visual
     * @param targetFrameRate defines the target frame rate (60 by default)
     * @returns a SceneOptimizerOptions object
     */
    static HighDegradationAllowed(targetFrameRate?: number): SceneOptimizerOptions;
}
/**
 * Class used to run optimizations in order to reach a target frame rate
 * @description More details at https://doc.babylonjs.com/features/featuresDeepDive/scene/sceneOptimizer
 */
export declare class SceneOptimizer implements IDisposable {
    private _isRunning;
    private _options;
    private _scene;
    private _currentPriorityLevel;
    private _targetFrameRate;
    private _trackerDuration;
    private _currentFrameRate;
    private _sceneDisposeObserver;
    private _improvementMode;
    /**
     * Defines an observable called when the optimizer reaches the target frame rate
     */
    onSuccessObservable: Observable<SceneOptimizer>;
    /**
     * Defines an observable called when the optimizer enables an optimization
     */
    onNewOptimizationAppliedObservable: Observable<SceneOptimization>;
    /**
     * Defines an observable called when the optimizer is not able to reach the target frame rate
     */
    onFailureObservable: Observable<SceneOptimizer>;
    /**
     * Gets or sets a boolean indicating if the optimizer is in improvement mode
     */
    get isInImprovementMode(): boolean;
    set isInImprovementMode(value: boolean);
    /**
     * Gets the current priority level (0 at start)
     */
    get currentPriorityLevel(): number;
    /**
     * Gets the current frame rate checked by the SceneOptimizer
     */
    get currentFrameRate(): number;
    /**
     * Gets or sets the current target frame rate (60 by default)
     */
    get targetFrameRate(): number;
    /**
     * Gets or sets the current target frame rate (60 by default)
     */
    set targetFrameRate(value: number);
    /**
     * Gets or sets the current interval between two checks (every 2000ms by default)
     */
    get trackerDuration(): number;
    /**
     * Gets or sets the current interval between two checks (every 2000ms by default)
     */
    set trackerDuration(value: number);
    /**
     * Gets the list of active optimizations
     */
    get optimizations(): SceneOptimization[];
    /**
     * Creates a new SceneOptimizer
     * @param scene defines the scene to work on
     * @param options defines the options to use with the SceneOptimizer
     * @param autoGeneratePriorities defines if priorities must be generated and not read from SceneOptimization property (true by default)
     * @param improvementMode defines if the scene optimizer must run the maximum optimization while staying over a target frame instead of trying to reach the target framerate (false by default)
     */
    constructor(scene: Scene, options?: SceneOptimizerOptions, autoGeneratePriorities?: boolean, improvementMode?: boolean);
    /**
     * Stops the current optimizer
     */
    stop(): void;
    /**
     * Reset the optimizer to initial step (current priority level = 0)
     */
    reset(): void;
    /**
     * Start the optimizer. By default it will try to reach a specific framerate
     * but if the optimizer is set with improvementMode === true then it will run all optimization while frame rate is above the target frame rate
     */
    start(): void;
    private _checkCurrentState;
    /**
     * Release all resources
     */
    dispose(): void;
    /**
     * Helper function to create a SceneOptimizer with one single line of code
     * @param scene defines the scene to work on
     * @param options defines the options to use with the SceneOptimizer
     * @param onSuccess defines a callback to call on success
     * @param onFailure defines a callback to call on failure
     * @returns the new SceneOptimizer object
     */
    static OptimizeAsync(scene: Scene, options?: SceneOptimizerOptions, onSuccess?: () => void, onFailure?: () => void): SceneOptimizer;
}