/**
 * Generate the fragment shader for `LitQuadBatcher` — the SpriteIlluminator
 * path that supports per-pixel normal-map lighting from up to `MAX_LIGHTS`
 * point lights.
 *
 * Sprites without a `normalMap` push `aNormalTextureId = -1` and take the
 * unlit fast path inside this same shader (sample color, multiply by
 * vertex color, return) so lit and unlit sprites can share the lit batch
 * when they coexist with active lights. The cost vs the truly-unlit
 * `QuadBatcher` shader is one varying read + one comparison per fragment.
 *
 * The light's "height above the sprite plane" is encoded as a small
 * fraction of the light's radius (default `0.075`) so that lights
 * exactly at a fragment's screen position don't produce degenerate
 * flat shading.
 * @param {number} maxTextures - the number of color/normal texture units to support
 * @returns {string} GLSL fragment shader source
 * @ignore
 */
export function buildLitMultiTextureFragment(maxTextures: number): string;
export { MAX_LIGHTS };
import { MAX_LIGHTS } from "../lighting/constants.ts";
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