/**
 * Procedural sky background pass.
 *
 * Draws one fullscreen triangle into the main render pass BEFORE any
 * geometry (the pass's colour attachments are cleared either way, so the
 * sky simply replaces the flat clear colour). Reverse-Z places it at the
 * far plane (z = 0) with depth writes off, so geometry always wins the
 * depth test and transparent surfaces blend over the sky correctly.
 *
 * The pipeline targets must mirror the main pass exactly: colour + object-id
 * attachments and the MSAA sample count. The object-id output is the
 * attachment's clear value, so picking still reads "background" on sky.
 */
import type { ResolvedEnvironment } from './environment.js';
export interface SkyPassFormats {
    colorFormat: GPUTextureFormat;
    objectIdFormat: GPUTextureFormat;
    depthFormat: GPUTextureFormat;
    sampleCount: number;
}
export interface SkyCamera {
    /** Camera world position → target direction, unit. */
    forward: [number, number, number];
    /** Screen-right in world space, unit. */
    right: [number, number, number];
    /** Screen-up in world space, unit. */
    up: [number, number, number];
    /** Vertical field of view in radians. */
    fovY: number;
    /** Viewport width / height. */
    aspect: number;
}
export declare class SkyPass {
    private device;
    private pipeline;
    private uniformBuffer;
    private bindGroup;
    private scratch;
    private destroyed;
    constructor(device: GPUDevice, formats: SkyPassFormats, shaderSource: string);
    /**
     * Record the sky draw into an already-begun render pass. Callers must
     * re-set their own pipeline + group(0) afterwards (the main loop does
     * this per batch anyway).
     */
    draw(pass: GPURenderPassEncoder, camera: SkyCamera, env: ResolvedEnvironment): void;
    destroy(): void;
}
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