multithreading - Simple FFT in C# as single core, multi core and OpenCL versions? -


i searched web , stack overflow fft versions in c# , asked several times , answers given, but...

  1. all of fft versions found optimized speed hard understand.
  2. almost of iterative versions, not optimized multi core systems.
  3. opencl versions optimized gpu models.

as working on case study single core, multi core, opencl comparison of algorithms, looking simple , free c# / opencl versions of fft, working on float[] (real, complex not needed), forward , inverse optional great. if work on array-length. has stumbled upon such?

this sample source brahma (my open-source project) has both c# implementation , linq implementation (opencl) of this fft paper microsoft research.

the kernels automagically generated brahma are:

the fft kernel

    __kernel void brahmakernel(int fftsize,__global float* a,__global float* ib,__global float* c,__global float* id,int size)      {         int x = get_global_id(0);         int b = ((floor(convert_float((x / fftsize))) * fftsize) / ((int)2));         int offset = (x % (fftsize / ((int)2)));         int x0 = (b + offset);         int x1 = (x0 + (size / ((int)2)));         float val0a = a[x0];         float val0b = ib[x0];         float val1a = a[x1];         float val1b = ib[x1];         float angle = (((float)-6.283185) * (convert_float(x) / convert_float(fftsize)));         float ta = native_cos(angle);         float tb = native_sin(angle);         (c[x] = ((val0a + (ta * val1a)) - (tb * val1b)));(id[x] = ((val0b + (tb * val1a)) + (ta * val1b)));     }

conjugate , scale kernel

    __kernel void brahmakernel(float scale,__global float* a,__global float* ib)      {         int x = get_global_id(0);         (a[x] = (a[x] * scale));(ib[x] = (-(ib[x]) * scale));;     }

hope helps!


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