/**
 * Tile-bin emit-pairs shader. For each projected splat, emits
 * `coverage[i]` (tile, splat) pairs into two parallel buffers,
 * starting at `emitOffset[i]`:
 *
 *   tileKeys [emitOffset[i] + j] = tileIdx
 *   splatValues[emitOffset[i] + j] = splatIdx (= i)
 *
 * The orchestrator sizes maxCoveragePerSplat to cover a sub-frame's
 * entire tile area, so a splat's `coverage[i]` always equals its full
 * bbox-in-group tile count — no truncation, no seams. The walk emits
 * row-major over the bbox-in-group. A subsequent key+value radix sort
 * groups pairs by tile; within each tile, the splatIdx-as-value sort
 * preserves the chunk's depth order (splatIdx is monotonic in depth
 * from the CPU pre-sort).
 *
 * Projection-mode variation: `PROJECTION_EQUIRECT` swaps in the
 * tile-walk-equirect chunk, which walks the un-clamped X range and
 * applies a modular wrap so a splat near the ±π longitude seam emits
 * tile keys on both sides of the image. Without the flag the
 * tile-walk-pinhole chunk walks the clamped bbox directly.
 *
 * @returns WGSL source for the emit-pairs compute shader.
 */
declare const tileBinEmitPairsWgsl: () => string;
export { tileBinEmitPairsWgsl };