Efficient 2D FFT in C for Large Arrays: Where to Find the Code?

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A user is seeking a C implementation of a 2D FFT that can efficiently process large arrays, specifically 8192 x 8192 in size. Previous attempts with resources from paulbourke and sanfoundry were unsuccessful, either yielding incorrect results or taking too long to compute. Recommendations include using FFTW, a widely recognized library for fast Fourier transforms, which also supports GPU implementations for enhanced performance. Additional resources mentioned include the Ooura FFT and the libfft library available on Linux.
Maciej Olszewski
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I am looking for a 2D fft that takes in a 2D array of heights and does a fft in c on the array. I would like if the code was capable of working with big arrays, such as 8192 x 8192 I have tried the paulbourke and sanfoundry websites. The first was not giving me the output that is expected and the second one took too long to compute. Does anyone know where I could find such code?
 
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On linux you have the libfft. I never use it but i know it exist.
 
As Dr Claude said FFTW, it is pretty well the standard, it even has GPU implementations if you have a decent graphics card.
 
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