/**
 * Build a balanced constant-index lookup for the threshold sample array.
 *
 * SkSL does not allow a runtime value to index a uniform array. A linear loop
 * works around that restriction, but makes every covered fragment visit every
 * segment. This tree keeps every array index constant while selecting the same
 * segment in at most `ceil(log2(sampleCount - 1))` comparisons (six for the
 * production 64-sample shader).
 */
export declare function buildThresholdLookupTree(sampleCount: number): string;
/** Build the complete time-varying threshold split shader. */
export declare function buildThresholdSplitShaderSource(sampleCount: number): string;
//# sourceMappingURL=thresholdSplitShaderSource.d.ts.map