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# rocFFT
rocFFT is a software library for computing fast Fourier transforms (FFTs) written in the HIP
programming language. It's part of AMD's software ecosystem based on
[ROCm](https://github.com/ROCm/ROCm). The rocFFT library can be used with AMD and
NVIDIA GPUs.
## Documentation
> [!NOTE]
> The published rocFFT documentation is available at [rocFFT](https://rocm.docs.amd.com/projects/rocFFT/en/latest/index.html) in an organized, easy-to-read format, with search and a table of contents. The documentation source files reside in the rocFFT/docs folder of this repository. As with all ROCm projects, the documentation is open source. For more information, see [Contribute to ROCm documentation](https://rocm.docs.amd.com/en/latest/contribute/contributing.html).
To build our documentation locally, use the following code:
```Bash
cd docs
pip3 install -r sphinx/requirements.txt
python3 -m sphinx -T -E -b html -d _build/doctrees -D language=en . _build/html
```
## Build and install
You can install rocFFT using pre-built packages or building from source.
* Installing pre-built packages:
1. Download the pre-built packages from the
[ROCm package servers](https://rocm.docs.amd.com/en/latest/deploy/linux/index.html) or use the
GitHub releases tab to download the source (this may give you a more recent version than the
pre-built packages).
2. Run: `sudo apt update && sudo apt install rocfft`
* Building from source:
rocFFT is compiled with AMD's clang++ and uses CMake. You can specify several options to customize your
build. The following commands build a shared library for supported AMD GPUs:
```bash
mkdir build && cd build
cmake -DCMAKE_CXX_COMPILER=amdclang++ -DCMAKE_C_COMPILER=amdclang ..
make -j
```
You can compile a static library using the `-DBUILD_SHARED_LIBS=off` option.
With rocFFT, you can use indirect function calls by default; this requires ROCm 4.3 or higher. You can
use `-DROCFFT_CALLBACKS_ENABLED=off` with CMake to prevent these calls on older ROCm
compilers. Note that with this configuration, callbacks won't work correctly.
rocFFT includes the following clients:
* `rocfft-bench`: Runs general transforms and is useful for performance analysis
* `rocfft-test`: Runs various regression tests
* Various small samples
| Client | CMake option | Dependencies |
|:------|:-----------------|:-----------------|
| `rocfft-bench` | `-DBUILD_CLIENTS_BENCH=on` | hipRAND |
| `rocfft-test` | `-DBUILD_CLIENTS_TESTS=on` | hipRAND, FFTW, GoogleTest |
| samples | `-DBUILD_CLIENTS_SAMPLES=on` | None |
Clients are not built by default. To build them, use `-DBUILD_CLIENTS=on`. The build process
downloads and builds GoogleTest and FFTW if they are not already installed.
Clients can be built separately from the main library. For example, you can build all the clients with
an existing rocFFT library by invoking CMake from within the `rocFFT-src/clients` folder:
```bash
mkdir build && cd build
cmake -DCMAKE_CXX_COMPILER=amdclang++ -DCMAKE_PREFIX_PATH=/path/to/rocFFT-lib ..
make -j
```
To install client dependencies on Ubuntu, run:
```bash
sudo apt install libgtest-dev libfftw3-dev libboost-dev
```
We use version 1.11 of GoogleTest.
## Examples
A summary of the latest functionality and workflow to compute an FFT with rocFFT is available on the
[rocFFT documentation portal](https://rocm.docs.amd.com/projects/rocFFT/en/latest/).
You can find additional examples in the `clients/samples` subdirectory.
## Support
You can report bugs and feature requests through the GitHub
[issue tracker](https://github.com/ROCm/rocFFT/issues).
## Contribute
If you want to contribute to rocFFT, you must follow our [contribution guidelines](https://github.com/ROCm/rocFFT/blob/develop/.github/CONTRIBUTING.md).
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