• 04/03/2020
  • Public Content
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Mandatory Callbacks for Kernels Supporting Advanced Tiling

Registering an advanced tiling kernel requires defining and specifying the following callback functions for the
vxAddAdvancedTilingKernelIntel
:
  • Inputs and output validation function. It is called during
    vxVerifyGraph
    to validate every input and output parameter (defined by the index):
    typedef vx_status (*vx_kernel_validate_f) (vx_node node, const vx_reference parameters[], vx_uint32 num, vx_meta_format metas[]);
    This function is a regular callback required for all any user kernel as defined by the OpenVX* 1.1 specification.
  • Advanced Tiling Kernel function. This function is called for each tile contained within the output image, during graph execution.
    typedef vx_status (*vx_advanced_tiling_kernel_intel_f)(vx_node node, void * parameters[], vx_uint32 num, void *tile_memory, vx_size tile_memory_size);
  • Tile-Mapping function, which describes dependencies between an output and input tiles during graph verification within
    vxVerifyGraph
    . The purpose of this function is to set attributes to the input tile (
    srcRectOut
    ), required to produce the given output tile (
    dstRectIn
    ), passed as a
    const
    parameter to the tile-mapping function).
    If the kernel has multiple
    vx_image
    input parameters, this tile mapping function will be called separately for each input. The
    param_num
    parameter specifies which input parameter index that the runtime is requesting a tile mapping for.
    typedef vx_status (*vx_mapping_intel_f) (vx_node node, vx_reference parameters[], const vx_tile_t_attributes_intel_t* dstRectIn, vx_tile_t_attributes_intel_t* srcRectOut,vx_uint32 param_num);
Refer to the Putting it all Together: Example Code topic for a code example of tiled kernels.

Product and Performance Information

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Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.