Enum
VkPipelineShaderStageCreateFlagBits
Bitmask controlling how a pipeline shader stage is created
Possible values of the flags member of
VkPipelineShaderStageCreateInfo specifying how a pipeline shader stage
is created, are:
typedef enum VkPipelineShaderStageCreateFlagBits {
} VkPipelineShaderStageCreateFlagBits;
VK_PIPELINE_SHADER_STAGE_CREATE_ALLOW_VARYING_SUBGROUP_SIZE_BITspecifies that theSubgroupSizemay vary in the shader stage.VK_PIPELINE_SHADER_STAGE_CREATE_REQUIRE_FULL_SUBGROUPS_BITspecifies that the subgroup sizes must be launched with all invocations active in the task, mesh, or compute stage.
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.