import type { WebGlShaderType } from '../../renderers/webgl/WebGlShaderNode.js';
/**
 * Properties of the {@link SdfShader}
 */
export interface SdfShaderProps {
    transform: Float32Array;
    /**
     * Color in RGBA format
     *
     * @remarks
     * Color channels must NOT be premultiplied by alpha for best blending results.
     */
    color: number;
    size: number;
    distanceRange: number;
}
/**
 * SdfShader supports multi-channel and single-channel signed distance field textures.
 *
 * @remarks
 * This Shader is used by the {@link SdfTextRenderer}. Do not use thie Shader
 * directly. Instead create a Text Node and assign a SDF font family to it.
 *
 * @internalRemarks
 * The only thing this shader does to support multi-channel SDFs is to
 * add a median function to the fragment shader. If this one function call
 * ends up being a performance bottleneck we can always look at ways to
 * remove it.
 */
export declare const Sdf: WebGlShaderType<SdfShaderProps>;