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groupshared float sharedAccumulators[ 64 ];
// Compute horisontal sum of the numbers. The result is only correct on the thread #0 of the group.
void horizontalSum( const uint thread, inout float sum )
{
sharedAccumulators[ thread ] = sum;
for( uint i = 32; i > 1; i /= 2 )
{
GroupMemoryBarrierWithGroupSync();
if( thread < i )
{
sum += sharedAccumulators[ thread + i ];
sharedAccumulators[ thread ] = sum;
}
}
GroupMemoryBarrierWithGroupSync();
if( 0 == thread )
sum += sharedAccumulators[ 1 ];
}
// Compute horisontal sum of the numbers, and broadcast to all threads of the group.
void horizontalSumBroadcast( const uint thread, inout float sum )
{
horizontalSum( thread, sum );
if( 0 == thread )
sharedAccumulators[ 0 ] = sum;
GroupMemoryBarrierWithGroupSync();
sum = sharedAccumulators[ 0 ];
}
// Compute horizontal maximum of the numbers, and broadcast to all threads of the group.
void horizontalMaxBroadcast( const uint thread, inout float ax )
{
sharedAccumulators[ thread ] = ax;
for( uint i = 32; i > 0; i /= 2 )
{
GroupMemoryBarrierWithGroupSync();
if( thread < i )
{
ax = max( ax, sharedAccumulators[ thread + i ] );
sharedAccumulators[ thread ] = ax;
}
}
GroupMemoryBarrierWithGroupSync();
ax = sharedAccumulators[ 0 ];
}
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