import { Storage3DTexture } from 'three/webgpu';
import type { ComputeNode, Node } from 'three/webgpu';
interface SmokeScalarTextureResource {
    texture: Storage3DTexture;
}
/** Minimal simulation controls and resources consumed by the multigrid projection graph. */
export interface SmokeMultigridSource {
    simRes: number;
    multigridMinResolution: number;
    multigridMaxLevels: number;
    subcellSolidFractions: boolean;
    neighborStride: Node<'float'>;
    inverseCellSizeSquared: Node<'vec3'>;
    pressureFactor: Node<'float'>;
    multigridCorrectionScale: Node<'float'>;
    multigridRecursiveCorrectionScale: Node<'float'>;
    _pressure3D: SmokeScalarTextureResource;
    _divergence3D: SmokeScalarTextureResource;
}
/** One resolution level in the smoke pressure V-cycle. */
export interface SmokeMultigridLevel {
    index: number;
    resolution: number;
    gridScale: number;
    dimensions: Node<'uvec3'>;
    dispatch: [number, number, number];
    pressureTexture: Storage3DTexture;
    rhsTexture: Storage3DTexture;
    solidTexture: Storage3DTexture | null;
    residualTexture: Storage3DTexture | null;
    pressureRed?: ComputeNode;
    pressureBlack?: ComputeNode;
    residual?: ComputeNode;
    restrict?: ComputeNode;
    prolong?: ComputeNode;
}
/** Owned hierarchy and lifecycle returned by {@link createSmokeMultigridProjectionPasses}. */
export interface SmokeMultigridProjectionPasses {
    levels: SmokeMultigridLevel[];
    dispose(): void;
}
/**
 * Build the multigrid V-cycle passes for the smoke pressure projection.
 *
 * Every level owns a single r32float pressure texture that the red-black SOR sweeps update in
 * place, so the hierarchy needs no ping-pong bookkeeping and half as many pipelines as a
 * two-texture design. Scalar transfer textures (rhs/residual) are r32float as well; only the
 * optional restricted solid field keeps four channels for its velocity payload.
 */
declare function createSmokeMultigridProjectionPasses(smoke: SmokeMultigridSource, solidTexture?: Storage3DTexture | null): SmokeMultigridProjectionPasses;
export { createSmokeMultigridProjectionPasses };