# VkCudaLaunchInfoNV(3) Manual Page

## Name

VkCudaLaunchInfoNV - Structure specifying the parameters to launch a CUDA kernel

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## C Specification

The `VkCudaLaunchInfoNV` structure is very close to the parameters of the CUDA-Driver function cuLaunchKernel documented in section 6.19 Execution Control of CUDA Driver API.

The structure is defined as:

    // Provided by VK_NV_cuda_kernel_launch
    typedef struct VkCudaLaunchInfoNV {
        VkStructureType        sType;
        const void*            pNext;
        VkCudaFunctionNV       function;
        uint32_t               gridDimX;
        uint32_t               gridDimY;
        uint32_t               gridDimZ;
        uint32_t               blockDimX;
        uint32_t               blockDimY;
        uint32_t               blockDimZ;
        uint32_t               sharedMemBytes;
        size_t                 paramCount;
        const void* const *    pParams;
        size_t                 extraCount;
        const void* const *    pExtras;
    } VkCudaLaunchInfoNV;

## Members

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `function` is the CUDA-Driver handle to the function being launched.

- `gridDimX` is the number of local workgroups to dispatch in the X dimension. It must be less than or equal to `VkPhysicalDeviceLimits`::`maxComputeWorkGroupCount`[0]

- `gridDimY` is the number of local workgroups to dispatch in the Y dimension. It must be less than or equal to `VkPhysicalDeviceLimits`::`maxComputeWorkGroupCount`[1]

- `gridDimZ` is the number of local workgroups to dispatch in the Z dimension. It must be less than or equal to `VkPhysicalDeviceLimits`::`maxComputeWorkGroupCount`[2]

- `blockDimX` is block size in the X dimension.

- `blockDimY` is block size in the Y dimension.

- `blockDimZ` is block size in the Z dimension.

- `sharedMemBytes` is the dynamic shared-memory size per thread block in bytes.

- `paramCount` is the length of the `pParams` table.

- `pParams` is a pointer to an array of `paramCount` pointers, corresponding to the arguments of `function`.

- `extraCount` is reserved for future use.

- `pExtras` is reserved for future use.

## Description

Kernel parameters of `function` are specified via `pParams`, very much the same way as described in cuLaunchKernel

If `function` has N parameters, then `pParams` must be an array of N pointers and `paramCount` must be N. Each of `kernelParams`[0] through `kernelParams`[N-1] must point to a region of memory from which the actual kernel parameter will be copied. The number of kernel parameters and their offsets and sizes are not specified here as that information is stored in the VkCudaFunctionNV object.

The application-owned memory pointed to by `pParams` and `kernelParams`[0] through `kernelParams`[N-1] are consumed immediately, and may be altered or freed after vkCmdCudaLaunchKernelNV has returned.

Valid Usage

- VUID-VkCudaLaunchInfoNV-gridDimX-09406
  `gridDimX` must be less than or equal to `VkPhysicalDeviceLimits`::`maxComputeWorkGroupCount`[0]

- VUID-VkCudaLaunchInfoNV-gridDimY-09407
  `gridDimY` must be less than or equal to `VkPhysicalDeviceLimits`::`maxComputeWorkGroupCount`[1]

- VUID-VkCudaLaunchInfoNV-gridDimZ-09408
  `gridDimZ` must be less than or equal to `VkPhysicalDeviceLimits`::`maxComputeWorkGroupCount`[2]

- VUID-VkCudaLaunchInfoNV-paramCount-09409
  `paramCount` must be the total amount of parameters listed in the `pParams` table

- VUID-VkCudaLaunchInfoNV-pParams-09410
  `pParams` must be a pointer to a table of `paramCount` parameters, corresponding to the arguments of `function`

- VUID-VkCudaLaunchInfoNV-extraCount-09411
  `extraCount` must be 0

- VUID-VkCudaLaunchInfoNV-pExtras-09412
  `pExtras` must be NULL

Valid Usage (Implicit)

- VUID-VkCudaLaunchInfoNV-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_CUDA_LAUNCH_INFO_NV`

- VUID-VkCudaLaunchInfoNV-pNext-pNext
  `pNext` must be `NULL`

- VUID-VkCudaLaunchInfoNV-function-parameter
  `function` must be a valid VkCudaFunctionNV handle

## See Also

VK_NV_cuda_kernel_launch, VkCudaFunctionNV, VkStructureType, vkCmdCudaLaunchKernelNV

## Document Notes

For more information, see the Vulkan Specification

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

## Copyright

Copyright 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0