D3DX11_FFT_BUFFER_INFO structure (d3dcsx.h)

Describes buffer requirements for an FFT.

Syntax

typedef struct D3DX11_FFT_BUFFER_INFO {
  UINT NumTempBufferSizes;
  UINT TempBufferFloatSizes[D3DX11_FFT_MAX_TEMP_BUFFERS];
  UINT NumPrecomputeBufferSizes;
  UINT PrecomputeBufferFloatSizes[D3DX11_FFT_MAX_PRECOMPUTE_BUFFERS];
} D3DX11_FFT_BUFFER_INFO;

Members

NumTempBufferSizes

Type: UINT

Number of temporary buffers needed. Allowed range is 0 to D3DX11_FFT_MAX_TEMP_BUFFERS.

TempBufferFloatSizes[D3DX11_FFT_MAX_TEMP_BUFFERS]

Type: UINT[D3DX11_FFT_MAX_TEMP_BUFFERS]

Minimum sizes (in FLOATs) of temporary buffers.

NumPrecomputeBufferSizes

Type: UINT

Number of precompute buffers required.
Allowed range is 0 to D3DX11_FFT_MAX_PRECOMPUTE_BUFFERS.

PrecomputeBufferFloatSizes[D3DX11_FFT_MAX_PRECOMPUTE_BUFFERS]

Type: UINT[D3DX11_FFT_MAX_PRECOMPUTE_BUFFERS]

Minimum sizes (in FLOATs) for precompute buffers.

Remarks

The D3DX11_FFT_BUFFER_INFO structure is initialized by a call to one of the create-FFT functions (for example, D3DX11CreateFFT). For more create-FFT functions, see D3DCSX 11 Functions.

Use the info in D3DX11_FFT_BUFFER_INFO to allocate raw buffers of the specified (or larger) sizes and then call the ID3DX11FFT::AttachBuffersAndPrecompute method to register the buffers with the FFT object.

Some FFT algorithms benefit from precomputing sin and cos. The FFT object might store precomputed data in the user-supplied buffers.

Requirements

See also

D3DCSX 11 Structures