import { Effect } from "postprocessing";
export declare enum RampType {
    Linear = 0,
    Radial = 1,
    MirroredLinear = 2
}
export type RampEffectOptions = {
    /**
     * Type of ramp gradient.
     */
    rampType: RampType;
    /**
     * Starting point of the ramp gradient in normalized coordinates.
     *
     * Ranges from `[0 - 1]` as `[x, y]`. Default is `[0.5, 0.5]`.
     */
    rampStart: [number, number];
    /**
     * Ending point of the ramp gradient in normalized coordinates.
     *
     * Ranges from `[0 - 1]` as `[x, y]`. Default is `[1, 1]`
     */
    rampEnd: [number, number];
    /**
     * Color at the starting point of the gradient.
     *
     * Default is black: `[0, 0, 0, 1]`
     */
    startColor: [number, number, number, number];
    /**
     * Color at the ending point of the gradient.
     *
     * Default is white: `[1, 1, 1, 1]`
     */
    endColor: [number, number, number, number];
    /**
     * Bias for the interpolation curve when both bias and gain are 0.5.
     *
     * Ranges from `[0 - 1]`. Default is `0.5`.
     */
    rampBias: number;
    /**
     * Gain for the interpolation curve when both bias and gain are 0.5.
     *
     * Ranges from `[0 - 1]`. Default is `0.5`.
     */
    rampGain: number;
    /**
     * When enabled, the ramp gradient is used as an effect mask, and colors are ignored.
     *
     * Default is `false`.
     */
    rampMask: boolean;
    /**
     * Controls whether the ramp gradient is inverted.
     *
     * When disabled, rampStart is transparent and rampEnd is opaque.
     *
     * Default is `false`.
     */
    rampInvert: boolean;
};
export declare class RampEffect extends Effect {
    state: RampEffectOptions;
    constructor({ 
    /**
     * Type of ramp gradient.
     */
    rampType, 
    /**
     * Starting point of the ramp gradient in normalized coordinates.
     *
     * Ranges from `[0 - 1]` as `[x, y]`. Default is `[0.5, 0.5]`.
     */
    rampStart, 
    /**
     * Ending point of the ramp gradient in normalized coordinates.
     *
     * Ranges from `[0 - 1]` as `[x, y]`. Default is `[1, 1]`
     */
    rampEnd, 
    /**
     * Color at the starting point of the gradient.
     *
     * Default is black: `[0, 0, 0, 1]`
     */
    startColor, 
    /**
     * Color at the ending point of the gradient.
     *
     * Default is white: `[1, 1, 1, 1]`
     */
    endColor, 
    /**
     * Bias for the interpolation curve when both bias and gain are 0.5.
     *
     * Ranges from `[0 - 1]`. Default is `0.5`.
     */
    rampBias, 
    /**
     * Gain for the interpolation curve when both bias and gain are 0.5.
     *
     * Ranges from `[0 - 1]`. Default is `0.5`.
     */
    rampGain, 
    /**
     * When enabled, the ramp gradient is used as an effect mask, and colors are ignored.
     *
     * Default is `false`.
     */
    rampMask, 
    /**
     * Controls whether the ramp gradient is inverted.
     *
     * When disabled, rampStart is transparent and rampEnd is opaque.
     *
     * Default is `false`.
     */
    rampInvert, }?: Partial<RampEffectOptions>);
    private updateUniform;
    updateUniforms(): void;
    updateState(state: Partial<RampEffectOptions>): void;
}