/**
 * SkyPass — renders a procedural sky into the main render pass.
 * Uses a fullscreen triangle at z=1.0 with depth write OFF, depth compare 'always'.
 */
export declare class SkyPass {
    private readonly _pipeline;
    private readonly _uniformBuffer;
    private readonly _bindGroup;
    private readonly _data;
    constructor(device: GPUDevice);
    /**
     * Update sky uniforms. Call before draw().
     * @param invVP — inverse view-projection matrix (16 floats)
     * @param sunDir — normalized sun direction in world space (3 floats)
     * @param sunIntensity — HDR intensity multiplier for sun disc/glow
     * @param zenithColor — sky color at zenith (3 floats, linear)
     * @param horizonColor — sky color at horizon (3 floats, linear)
     */
    update(device: GPUDevice, invVP: Float32Array, sunDir: Float32Array, sunIntensity: number, zenithColor: Float32Array, horizonColor: Float32Array, groundColor: Float32Array, groundFalloff: number): void;
    /** Draw sky into the current render pass. */
    draw(pass: GPURenderPassEncoder): void;
    destroy(): void;
}
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