/**
 * Generates a multi-texture fragment shader source string.
 * Declares individual sampler uniforms (uSampler0..uSamplerN) and uses
 * an if/else chain with 0.5-offset thresholds to select the correct texture unit.
 * @param {number} maxTextures - the number of texture units to support
 * @returns {string} GLSL fragment shader source
 * @ignore
 */
export function buildMultiTextureFragment(maxTextures: number): string;
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