OpenVX is defined as an API in the C99 language. Khronos provides a corresponding set of header files for applications using the API, which may be used in either C or C++ code. The interface descriptions in the OpenVX specification are the same as the interfaces defined in these header files.

OpenVX Combined API header file is VX/vx.h.

Table 1. Header files included in VX/vx.h
Header File Details

VX/vx_types.h

The type definitions required by OpenVX Library.

VX/vx_api.h

The API definition for OpenVX.

VX/vx_kernels.h

The list of supported kernels in the OpenVX standard.

VX/vx_nodes.h

The "Simple" API interface for OpenVX. These APIs are just wrappers around the more verbose functions defined in VX/vx_api.h.

VX/vx_vendors.h

The OpenVX Vendor ID list. As new vendors submit their implementations, this enumeration will grow.

Applications normally will include the header file VX/vx.h.

OpenVX extensions are defined in separate header files allowing applications to decide whether or not to include them. The header files for OpenVX extensions are of the form VX/<extension-name>.h.

Table 2. OpenVX KHR Extensions
Header File Details

VX/vx_khr_nn.h

OpenVX KHR Neural Network Extension

VX/vx_khr_pipelining.h

OpenVX KHR Pipelining Extension

VX/vx_khr_ix.h

OpenVX KHR Export And Import Extension

VX/vx_khr_user_data_object.h

OpenVX KHR User Data Object Extension
Table 3. OpenVX KHR Provisional Extensions
Header File Details

VX/vx_khr_bidirectional_parameters.h

OpenVX KHR Bidirectional Parameters Extension

VX/vx_khr_raw_image.h

OpenVX KHR Raw Image Extension

VX/vx_khr_swap_move.h

OpenVX KHR Swap And Move kernel Extension

VX/vx_khr_import_kernel.h

OpenVX KHR Import Kernel Extension

VX/vx_khr_buffer_aliasing.h

OpenVX KHR Buffer Aliasing Extension

VX/vx_khr_class.h

OpenVX KHR Classifier Extension

VX/vx_khr_icd.h

OpenVX KHR Installable Client Driver Extension

VX/vx_khr_opencl_interop.h

OpenVX KHR OpenCL Interop Extension

VX/vx_khr_tiling.h

OpenVX KHR Tiling Extension

VX/vx_khr_xml.h

OpenVX KHR XML Extension