# VkPipelineShaderStageCreateFlagBits(3) Manual Page

## Name

VkPipelineShaderStageCreateFlagBits - Bitmask controlling how a pipeline shader stage is created

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## C Specification

Possible values of the `flags` member of VkPipelineShaderStageCreateInfo specifying how a pipeline shader stage is created, are:

    // Provided by VK_VERSION_1_0
    typedef enum VkPipelineShaderStageCreateFlagBits {
      // Provided by VK_VERSION_1_3
        VK_PIPELINE_SHADER_STAGE_CREATE_ALLOW_VARYING_SUBGROUP_SIZE_BIT = 0x00000001,
      // Provided by VK_VERSION_1_3
        VK_PIPELINE_SHADER_STAGE_CREATE_REQUIRE_FULL_SUBGROUPS_BIT = 0x00000002,
      // Provided by VK_EXT_subgroup_size_control
        VK_PIPELINE_SHADER_STAGE_CREATE_ALLOW_VARYING_SUBGROUP_SIZE_BIT_EXT = VK_PIPELINE_SHADER_STAGE_CREATE_ALLOW_VARYING_SUBGROUP_SIZE_BIT,
      // Provided by VK_EXT_subgroup_size_control
        VK_PIPELINE_SHADER_STAGE_CREATE_REQUIRE_FULL_SUBGROUPS_BIT_EXT = VK_PIPELINE_SHADER_STAGE_CREATE_REQUIRE_FULL_SUBGROUPS_BIT,
    } VkPipelineShaderStageCreateFlagBits;

## Description

- `VK_PIPELINE_SHADER_STAGE_CREATE_ALLOW_VARYING_SUBGROUP_SIZE_BIT` specifies that the `SubgroupSize` may vary in the shader stage.

- `VK_PIPELINE_SHADER_STAGE_CREATE_REQUIRE_FULL_SUBGROUPS_BIT` specifies that the subgroup sizes must be launched with all invocations active in the task, mesh, or compute stage.

Note | If `VK_PIPELINE_SHADER_STAGE_CREATE_ALLOW_VARYING_SUBGROUP_SIZE_BIT_EXT` and `VK_PIPELINE_SHADER_STAGE_CREATE_REQUIRE_FULL_SUBGROUPS_BIT_EXT` are specified and `minSubgroupSize` does not equal `maxSubgroupSize` and no required subgroup size is specified, then the only way to guarantee that the 'X' dimension of the local workgroup size is a multiple of `SubgroupSize` is to make it a multiple of `maxSubgroupSize`. Under these conditions, you are guaranteed full subgroups but not any particular subgroup size.

## See Also

VK_VERSION_1_0, VkPipelineShaderStageCreateFlags

## 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 2014-2025 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0