## 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
// Provided by VK_VERSION_1_3
// Provided by VK_VERSION_1_3
// Provided by VK_EXT_subgroup_size_control
// Provided by VK_EXT_subgroup_size_control
} 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 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.