FlagFFT C API Reference

Plan Creation

Function	Description
flagfftPlan1d	Create a 1D FFT plan
flagfftPlan2d	Create a 2D FFT plan (currently returns FLAGFFT_NOT_SUPPORTED)
flagfftPlan3d	Create a 3D FFT plan (currently returns FLAGFFT_NOT_SUPPORTED)
flagfftPlanMany	Create a batched FFT plan with custom layouts

Execution

Function	Description
flagfftExecC2C	Complex-to-complex transform (complex64)
flagfftExecZ2Z	Complex-to-complex transform (complex128)
flagfftExecR2C	Real-to-complex transform (float)
flagfftExecD2Z	Real-to-complex transform (double)
flagfftExecC2R	Complex-to-real transform (float)
flagfftExecZ2D	Complex-to-real transform (double)

Stream and Lifecycle

Function	Description
flagfftSetStream	Attach a CUDA stream to a plan
flagfftDestroy	Destroy a plan and free resources
flagfftGetPlanDescription	Get human-readable plan description

Types

Type	Description
flagfftHandle	Opaque plan handle
flagfftResult	Return status code
flagfftStream_t	Backend-neutral opaque stream type
flagfftComplex	Single-precision complex number
flagfftDoubleComplex	Double-precision complex number

Transform Types

Constant	Description
FLAGFFT_C2C	Complex-to-complex (complex64)
FLAGFFT_Z2Z	Complex-to-complex (complex128)
FLAGFFT_R2C	Real-to-complex (float)
FLAGFFT_D2Z	Real-to-complex (double)
FLAGFFT_C2R	Complex-to-real (float)
FLAGFFT_Z2D	Complex-to-real (double)

Status Codes

Constant	Description
FLAGFFT_SUCCESS	Operation completed successfully
FLAGFFT_NOT_SUPPORTED	Requested operation is not supported