TheRock/rocm-libraries/projects/hipfft/clients/samples/hipfft_2d_z2z.cpp

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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#include <complex>
#include <iostream>
#include <vector>

#include <hipfft/hipfft.h>

DISABLE_WARNING_PUSH
DISABLE_WARNING_DEPRECATED_DECLARATIONS
DISABLE_WARNING_RETURN_TYPE
#include <hip/hip_runtime_api.h>
DISABLE_WARNING_POP

int main()
{
    std::cout << "hipfft 2D double-precision complex-to-complex transform\n";

    const int Nx        = 4;
    const int Ny        = 4;
    int       direction = HIPFFT_FORWARD; // forward=-1, backward=1

    std::vector<std::complex<double>> cdata(Nx * Ny);
    size_t complex_bytes = sizeof(decltype(cdata)::value_type) * cdata.size();

    // Create HIP device object and copy data to device:
    // hipfftComplex for single-precision
    hipfftDoubleComplex* x;
    hipError_t           hip_rt = hipMalloc(&x, complex_bytes);
    if(hip_rt != hipSuccess)
        throw std::runtime_error("hipMalloc failed");

    // Initialize the data
    for(size_t i = 0; i < static_cast<size_t>(Nx) * Ny; i++)
    {
        cdata[i] = i;
    }
    std::cout << "input:\n";
    for(size_t i = 0; i < static_cast<size_t>(Nx); i++)
    {
        for(size_t j = 0; j < static_cast<size_t>(Ny); j++)
        {
            size_t pos = i * Ny + j;
            std::cout << cdata[pos] << " ";
        }
        std::cout << "\n";
    }
    std::cout << std::endl;
    hip_rt = hipMemcpy(x, cdata.data(), complex_bytes, hipMemcpyHostToDevice);
    if(hip_rt != hipSuccess)
        throw std::runtime_error("hipMemcpy failed");

    // Create plan (hipfftPlan2d internally allocates the handle)
    hipfftHandle plan{};
    hipfftResult hipfft_rt
        = hipfftPlan2d(&plan, // plan handle
                       Nx, // transform length
                       Ny, // transform length
                       HIPFFT_Z2Z); // transform type (HIPFFT_C2C for single-precision)
    if(hipfft_rt != HIPFFT_SUCCESS)
        throw std::runtime_error("hipfftPlan2d failed");

    // Execute plan
    // hipfftExecZ2Z: double precision, hipfftExecC2C: for single-precision
    hipfft_rt = hipfftExecZ2Z(plan, x, x, direction);
    if(hipfft_rt != HIPFFT_SUCCESS)
        throw std::runtime_error("hipfftExecZ2Z failed");

    std::cout << "output:\n";
    hip_rt = hipMemcpy(cdata.data(), x, complex_bytes, hipMemcpyDeviceToHost);
    if(hip_rt != hipSuccess)
        throw std::runtime_error("hipMemcpy failed");
    for(size_t i = 0; i < static_cast<size_t>(Nx); i++)
    {
        for(size_t j = 0; j < static_cast<size_t>(Ny); j++)
        {
            auto pos = i * Ny + j;
            std::cout << cdata[pos] << " ";
        }
        std::cout << "\n";
    }
    std::cout << std::endl;

    if(hipfftDestroy(plan) != HIPFFT_SUCCESS)
        throw std::runtime_error("hipfftDestroy failed");

    hip_rt = hipFree(x);
    if(hip_rt != hipSuccess)
        throw std::runtime_error("hipFree failed");

    return 0;
}