import type { ComputeNode } from 'three/webgpu';
import type { TSLFloatNode, TSLStorageNode } from '../../../types/tsl.cjs';
import { type SPHSpatialGrid } from './SPHGridContracts.cjs';
export interface SPHDensityDiffusionPassOptions {
    positions: TSLStorageNode<'vec3'>;
    velocities: TSLStorageNode<'vec3'>;
    densities: TSLStorageNode<'float'>;
    densityDeltas: TSLStorageNode<'float'>;
    particleCount: number;
    mass: TSLFloatNode;
    h2: TSLFloatNode;
    poly6: TSLFloatNode;
    coefficient: TSLFloatNode;
    grid: SPHSpatialGrid | null;
    is3D: boolean;
}
export interface SPHDensityDiffusionPasses {
    computeDelta: ComputeNode;
    applyDelta: ComputeNode;
}
/** Create an optional pair of SPH density-diffusion passes. */
export declare function createDensityDiffusionPasses({ positions, velocities, densities, densityDeltas, particleCount, mass, h2, poly6, coefficient, grid, is3D, }: SPHDensityDiffusionPassOptions): SPHDensityDiffusionPasses;