min_atomic.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;
 
#if 1
shared int min_group;
 
layout(local_size_x= 1024) in;
void main( )
{
    uint id= gl_GlobalInvocationID.x;
    
    if(gl_LocalInvocationID.x == 0)
        min_group= 1000000; // max int
    
    barrier();
    memoryBarrierShared();
    
    if(id < N)
        atomicMin(min_group, data[id]);
        
    if(gl_LocalInvocationID.x == 0)
        atomicMin(tmp[1], min_group);
}
#else
layout(local_size_x= 1024) in;
void main( )
{
    uint id= gl_GlobalInvocationID.x;
    
    if(id < N)
        atomicMin(tmp[1], data[id]);
}
#endif
 
#endif