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WaveReadLaneAt function

  • Article

Returns the value of the expression for the given lane index within the specified wave.

Syntax

<type> WaveReadLaneAt(
   <type> expr,
   uint laneIndex
);

Parameters

expr

The expression to evaluate.

laneIndex

The index of the lane for which the expr result will be returned.

Return value

The resulting value is the result of expr. It will be uniform if laneIndex is uniform.

Remarks

If laneIndex is uniform, then this is effectively a broadcast operation; otherwise, it's a shuffle operation.

The result is undefined on a helper lane, or if the lane referred to by laneIndex is inactive or a helper lane.

This function is supported from shader model 6.0 in all shader stages.

See also