WaveIsFirstLane function

Returns true only for the active lane in the current wave with the smallest index.

Syntax

bool WaveIsFirstLane(void);

This function has no parameters.

True only for the active lane in the current wave with the smallest index.

This function can be used to identify operations that are to be executed only once per wave.

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

 if ( WaveIsFirstLane() )
{
    . . . // once per-wave code
}