Hi all,
I have a structured buffer who contains a linear data, its size is large enought to contains a max of data, it's a pool.
The not-used memory is here to avoid problem of sync, maybe a better solution exist, but for now it's ok.
The problem is using Dispatch(1,1,1) all works ok but using thread group I have problem.
I used thread group of 8 on x-y-z axis, so I just do ceil(SizeX/8),ceil(SizeY/8),ceil(SizeZ/8) and set that on the dispatch function.
The compute shader code :
[numthreads(8, 8, 8)]
void GenerateLightGrid(uint3 dispatchThreadID : SV_DispatchThreadID)
{
// Get the x/y/Z values.
uint x = dispatchThreadID.x;
uint y = dispatchThreadID.y;
uint z = dispatchThreadID.z;
// Compute the start offset.
uint StartOffset = (x*MAX_LIGHT) + (y*(Width*MAX_LIGHT)) + (z*Width*Height*MAX_LIGHT);
// Offset used to store indices.
uint Offset = StartOffset;
// Each point light.
uint NumPointLight = 0;
for( uint pl = 0; pl < PointLightCount; ++pl )
{
// Get the screen rect.
SCREEN_RECT ScreenRect = PointLightRectsReadOnly[ pl ];
// Check for invalid bounds.
if( ( int( z ) > ScreenRect.MaxZ || int( z ) < ScreenRect.MinZ ) ||
( int( x ) > ScreenRect.MaxX || int( x ) < ScreenRect.MinX ) ||
( int( y ) > ScreenRect.MaxY || int( y ) < ScreenRect.MinY ) )
continue;
// Set the light index and add offset.
LightIndices[ Offset++ ] = pl;
// Add a point light.
++NumPointLight;
}
// Set the light count.
LightLookup[ dispatchThreadID ] = uint4( StartOffset, NumPointLight, 0, 0 );
}Using :
[numthreads(1, 1, 1)]There is no problem, only when using thread group I have bad result.
Since the array is linear normally there should not have problems.
Thanks for the help
