import type { Scene } from '@certe/atmos-core';
import { DirectionalLight } from './directional-light.js';
import { PointLight } from './point-light.js';
import { SpotLight } from './spot-light.js';
export declare const MAX_DIR_LIGHTS = 4;
export declare const MAX_POINT_LIGHTS = 4;
export declare const MAX_SPOT_LIGHTS = 4;
/**
 * GPU layout (592 bytes):
 *   cameraPos:    vec4<f32>                          16
 *   numDirLights: u32, numPointLights: u32,
 *     numSpotLights: u32, pad                        16
 *   dirLights:    array<DirLight, 4>  (32 each)     128
 *   pointLights:  array<PointLight, 4> (32 each)    128
 *   spotLights:   array<SpotLight, 4> (64 each)     256
 *   fogEnabled: u32, fogMode: u32, fogDensity, fogStart  16
 *   fogEnd, _pad, _pad2, _pad3                       16  (align fogColor to 16)
 *   fogColor: vec4<f32>                              16
 */
export declare const SCENE_UNIFORM_SIZE = 592;
export interface FogSettings {
    enabled: boolean;
    mode: 'linear' | 'exponential';
    density: number;
    start: number;
    end: number;
    color: Float32Array;
}
export interface LightSettings {
    direction: Float32Array;
    color: Float32Array;
    intensity: number;
}
export declare function createDirectionalLight(direction?: [number, number, number], color?: [number, number, number], intensity?: number): LightSettings;
export interface SceneLightData {
    dirCount: number;
    pointCount: number;
    spotCount: number;
    /** 4 × (dirX, dirY, dirZ, 0, colR, colG, colB, intensity) = 32 floats */
    dirLights: Float32Array;
    /** 4 × (posX, posY, posZ, range, colR, colG, colB, intensity) = 32 floats */
    pointLights: Float32Array;
    /** 4 × (posX, posY, posZ, range, dirX, dirY, dirZ, outerCos,
     *       colR, colG, colB, intensity, innerCos, pad, pad, pad) = 64 floats */
    spotLights: Float32Array;
    /** Component references for shadow pass selection (up to MAX per type). */
    dirComponents: DirectionalLight[];
    pointComponents: PointLight[];
    spotComponents: SpotLight[];
}
/** Gather DirectionalLight, PointLight, and SpotLight components from the scene. */
export declare function collectSceneLights(scene: Scene): SceneLightData;
/**
 * Write scene uniforms into a Float32Array for GPU upload.
 * Uses the new multi-light layout when SceneLightData is provided,
 * or falls back to single-light LightSettings for backwards compat.
 */
export declare function writeSceneUniforms(out: Float32Array, cameraPos: Float32Array, sceneLights?: SceneLightData, fallback?: LightSettings, fog?: FogSettings, time?: number, cameraNear?: number, cameraFar?: number): void;
//# sourceMappingURL=light.d.ts.map