lamino-filters/src/scale.cl

__kernel void scale ( __global float *in, __global float *out, const float factor )
{
    const int idx = get_global_id(0);
    const int idy = get_global_id(1);
    const int index = idy * get_global_size(0) + idx;
    out[index] = in[index] * factor; 
}