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layout(local_size_x=1) in;
uniform uint elements;
layout(binding=0, std430) buffer sumBuffer
{
uint sum[];
};
layout(binding=1, std430) buffer offsetBuffer
{
uint offset[];
};
void main(void)
{
uint id=gl_GlobalInvocationID.x;
uint m=elements/gl_NumWorkGroups.x;
uint r=elements-m*gl_NumWorkGroups.x;
uint row,stop;
if(id < r) {
row=m*id+id;
stop=row+m+1u;
} else {
row=m*id+r;
stop=row+m;
}
uint Sum=offset[row];
for(uint i=row+1u; i < stop; ++i) {
Sum += offset[i];
offset[i]=Sum;
}
sum[id+1u]=Sum;
}
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