min_data.glsl

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#version 430
 
#ifdef COMPUTE_SHADER
 
layout(binding= 0, std430) readonly buffer inputData 
{
    int data[];
};
 
layout(binding= 1, std430) coherent buffer tmpData 
{
    int tmp[];
};
 
uniform uint N;
uniform uint n;
 
layout(local_size_x= 1024) in;
void main( )
{
    uint id= gl_GlobalInvocationID.x;
    
    if(id < N/2)
        tmp[N/2+id]= min(data[id*2], data[id*2+1]);
    
    if(id < n/2)
        tmp[n/2+id]= min(tmp[n+id*2], tmp[n+id*2+1]);
}
 
#endif