import { Mesh } from 'three';
import type { PerspectiveCamera, Texture } from 'three';
import type { StereoMode } from '@vizor-vr/shared';
import type { IProjection } from './projection.js';
/**
 * Dual fisheye projection for 360 content captured with dual-fisheye cameras
 * (e.g. Ricoh Theta, Insta360).
 *
 * The texture contains two circular fisheye images side by side:
 *   - Left circle: front hemisphere (z >= 0)
 *   - Right circle: back hemisphere (z < 0)
 *
 * Uses a full inverted SphereGeometry (like equirectangular) but with a
 * ShaderMaterial that computes fisheye UV mapping from world-space direction
 * vectors rather than relying on geometry UVs.
 *
 * For stereo content, two spheres are created on separate Three.js layers
 * with shader uniforms selecting the appropriate texture sub-region per eye.
 */
/** Clamp a capture-lens angle to the supported 120-250 deg range (default 180). */
export declare function clampLensAngle(deg: number | undefined | null): number;
export declare class FisheyeProjection implements IProjection {
    private meshes;
    private readonly lensFovRad;
    constructor(lensAngleDeg?: number);
    createMeshes(texture: Texture, stereoMode: StereoMode): Mesh[];
    configureCamera(camera: PerspectiveCamera): void;
    update(_camera: PerspectiveCamera, _time: number): void;
    dispose(): void;
    private createSphere;
}
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