__kernel void reconstruct(      __write_only image2d_t backbuffer,
                                __global float4* traceResult,
                const int num,
                const int w,
                const int h)
{
        int idx = get_global_id(0);

        if(idx < num)
        {
            int2 coord = (int2)(idx % w, idx / w);
            float4 barycentric = traceResult[idx];
            barycentric.z = 1.0 - barycentric.x - barycentric.y;
            barycentric.w = 1.0;
            write_imagef(backbuffer, coord, barycentric);
        }
}