import type { Scene } from '@certe/atmos-core';
import type { Mat4Type } from '@certe/atmos-math';
/**
 * Single 2D perspective shadow map for spot lights.
 * Uses perspective projection matching the spot cone (FOV = outerAngle * 2).
 */
export declare class SpotShadowPass {
    private readonly _device;
    private readonly _pipeline;
    private readonly _lightVPBuffer;
    private readonly _lightVPBindGroup;
    private readonly _depthTexture;
    private readonly _sampler;
    readonly shadowMapView: GPUTextureView;
    readonly resolution: number;
    private readonly _view;
    private readonly _proj;
    private readonly _vp;
    private readonly _target;
    private readonly _up;
    get lightVPBuffer(): GPUBuffer;
    get shadowSampler(): GPUSampler;
    constructor(device: GPUDevice, objectBindGroupLayout: GPUBindGroupLayout, resolution?: number);
    /**
     * Render shadow map from the spot light's perspective.
     * @param lightPos  World position of the spot light
     * @param lightDir  Normalized world direction of the spot light
     * @param outerAngle Half-angle in radians
     * @param range     Light range (used as far plane)
     */
    execute(encoder: GPUCommandEncoder, scene: Scene, lightPos: Float32Array, lightDir: Float32Array, outerAngle: number, range: number, extraDraw?: (pass: GPURenderPassEncoder) => void): void;
    /** Return the computed view-projection matrix (valid after execute). */
    getViewProjection(): Mat4Type;
    destroy(): void;
}
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