VkAccessFlagBits2(3)

# VkAccessFlagBits2(3) Manual Page

## Name

VkAccessFlagBits2 - Access flags for VkAccessFlags2

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## C Specification

Bits which can be set in the `srcAccessMask` and `dstAccessMask` members of VkMemoryBarrier2KHR, VkImageMemoryBarrier2KHR, and VkBufferMemoryBarrier2KHR, specifying access behavior, are:

    // Provided by VK_VERSION_1_3
    // Flag bits for VkAccessFlagBits2
    typedef VkFlags64 VkAccessFlagBits2;
    static const VkAccessFlagBits2 VK_ACCESS_2_NONE = 0ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_NONE_KHR = 0ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_INDIRECT_COMMAND_READ_BIT = 0x00000001ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_INDIRECT_COMMAND_READ_BIT_KHR = 0x00000001ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_INDEX_READ_BIT = 0x00000002ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_INDEX_READ_BIT_KHR = 0x00000002ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_VERTEX_ATTRIBUTE_READ_BIT = 0x00000004ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_VERTEX_ATTRIBUTE_READ_BIT_KHR = 0x00000004ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_UNIFORM_READ_BIT = 0x00000008ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_UNIFORM_READ_BIT_KHR = 0x00000008ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_INPUT_ATTACHMENT_READ_BIT = 0x00000010ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_INPUT_ATTACHMENT_READ_BIT_KHR = 0x00000010ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADER_READ_BIT = 0x00000020ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADER_READ_BIT_KHR = 0x00000020ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADER_WRITE_BIT = 0x00000040ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADER_WRITE_BIT_KHR = 0x00000040ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_COLOR_ATTACHMENT_READ_BIT = 0x00000080ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_COLOR_ATTACHMENT_READ_BIT_KHR = 0x00000080ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_COLOR_ATTACHMENT_WRITE_BIT = 0x00000100ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_COLOR_ATTACHMENT_WRITE_BIT_KHR = 0x00000100ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_DEPTH_STENCIL_ATTACHMENT_READ_BIT = 0x00000200ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_DEPTH_STENCIL_ATTACHMENT_READ_BIT_KHR = 0x00000200ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT = 0x00000400ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT_KHR = 0x00000400ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_TRANSFER_READ_BIT = 0x00000800ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_TRANSFER_READ_BIT_KHR = 0x00000800ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_TRANSFER_WRITE_BIT = 0x00001000ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_TRANSFER_WRITE_BIT_KHR = 0x00001000ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_HOST_READ_BIT = 0x00002000ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_HOST_READ_BIT_KHR = 0x00002000ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_HOST_WRITE_BIT = 0x00004000ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_HOST_WRITE_BIT_KHR = 0x00004000ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_MEMORY_READ_BIT = 0x00008000ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_MEMORY_READ_BIT_KHR = 0x00008000ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_MEMORY_WRITE_BIT = 0x00010000ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_MEMORY_WRITE_BIT_KHR = 0x00010000ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADER_SAMPLED_READ_BIT = 0x100000000ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADER_SAMPLED_READ_BIT_KHR = 0x100000000ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADER_STORAGE_READ_BIT = 0x200000000ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADER_STORAGE_READ_BIT_KHR = 0x200000000ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADER_STORAGE_WRITE_BIT = 0x400000000ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADER_STORAGE_WRITE_BIT_KHR = 0x400000000ULL;
    // Provided by VK_KHR_video_decode_queue
    static const VkAccessFlagBits2 VK_ACCESS_2_VIDEO_DECODE_READ_BIT_KHR = 0x800000000ULL;
    // Provided by VK_KHR_video_decode_queue
    static const VkAccessFlagBits2 VK_ACCESS_2_VIDEO_DECODE_WRITE_BIT_KHR = 0x1000000000ULL;
    #ifdef VK_ENABLE_BETA_EXTENSIONS
    // Provided by VK_KHR_video_encode_queue
    static const VkAccessFlagBits2 VK_ACCESS_2_VIDEO_ENCODE_READ_BIT_KHR = 0x2000000000ULL;
    #endif
    #ifdef VK_ENABLE_BETA_EXTENSIONS
    // Provided by VK_KHR_video_encode_queue
    static const VkAccessFlagBits2 VK_ACCESS_2_VIDEO_ENCODE_WRITE_BIT_KHR = 0x4000000000ULL;
    #endif
    // Provided by VK_KHR_synchronization2 with VK_EXT_transform_feedback
    static const VkAccessFlagBits2 VK_ACCESS_2_TRANSFORM_FEEDBACK_WRITE_BIT_EXT = 0x02000000ULL;
    // Provided by VK_KHR_synchronization2 with VK_EXT_transform_feedback
    static const VkAccessFlagBits2 VK_ACCESS_2_TRANSFORM_FEEDBACK_COUNTER_READ_BIT_EXT = 0x04000000ULL;
    // Provided by VK_KHR_synchronization2 with VK_EXT_transform_feedback
    static const VkAccessFlagBits2 VK_ACCESS_2_TRANSFORM_FEEDBACK_COUNTER_WRITE_BIT_EXT = 0x08000000ULL;
    // Provided by VK_KHR_synchronization2 with VK_EXT_conditional_rendering
    static const VkAccessFlagBits2 VK_ACCESS_2_CONDITIONAL_RENDERING_READ_BIT_EXT = 0x00100000ULL;
    // Provided by VK_KHR_synchronization2 with VK_NV_device_generated_commands
    static const VkAccessFlagBits2 VK_ACCESS_2_COMMAND_PREPROCESS_READ_BIT_NV = 0x00020000ULL;
    // Provided by VK_KHR_synchronization2 with VK_NV_device_generated_commands
    static const VkAccessFlagBits2 VK_ACCESS_2_COMMAND_PREPROCESS_WRITE_BIT_NV = 0x00040000ULL;
    // Provided by VK_KHR_fragment_shading_rate with VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_FRAGMENT_SHADING_RATE_ATTACHMENT_READ_BIT_KHR = 0x00800000ULL;
    // Provided by VK_KHR_synchronization2 with VK_NV_shading_rate_image
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADING_RATE_IMAGE_READ_BIT_NV = 0x00800000ULL;
    // Provided by VK_KHR_acceleration_structure with VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_ACCELERATION_STRUCTURE_READ_BIT_KHR = 0x00200000ULL;
    // Provided by VK_KHR_acceleration_structure with VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_ACCELERATION_STRUCTURE_WRITE_BIT_KHR = 0x00400000ULL;
    // Provided by VK_KHR_synchronization2 with VK_NV_ray_tracing
    static const VkAccessFlagBits2 VK_ACCESS_2_ACCELERATION_STRUCTURE_READ_BIT_NV = 0x00200000ULL;
    // Provided by VK_KHR_synchronization2 with VK_NV_ray_tracing
    static const VkAccessFlagBits2 VK_ACCESS_2_ACCELERATION_STRUCTURE_WRITE_BIT_NV = 0x00400000ULL;
    // Provided by VK_KHR_synchronization2 with VK_EXT_fragment_density_map
    static const VkAccessFlagBits2 VK_ACCESS_2_FRAGMENT_DENSITY_MAP_READ_BIT_EXT = 0x01000000ULL;
    // Provided by VK_KHR_synchronization2 with VK_EXT_blend_operation_advanced
    static const VkAccessFlagBits2 VK_ACCESS_2_COLOR_ATTACHMENT_READ_NONCOHERENT_BIT_EXT = 0x00080000ULL;
    // Provided by VK_EXT_descriptor_buffer
    static const VkAccessFlagBits2 VK_ACCESS_2_DESCRIPTOR_BUFFER_READ_BIT_EXT = 0x20000000000ULL;
    // Provided by VK_HUAWEI_invocation_mask
    static const VkAccessFlagBits2 VK_ACCESS_2_INVOCATION_MASK_READ_BIT_HUAWEI = 0x8000000000ULL;
    // Provided by VK_KHR_ray_tracing_maintenance1 with VK_KHR_synchronization2 and VK_KHR_ray_tracing_pipeline
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADER_BINDING_TABLE_READ_BIT_KHR = 0x10000000000ULL;
    // Provided by VK_EXT_opacity_micromap
    static const VkAccessFlagBits2 VK_ACCESS_2_MICROMAP_READ_BIT_EXT = 0x100000000000ULL;
    // Provided by VK_EXT_opacity_micromap
    static const VkAccessFlagBits2 VK_ACCESS_2_MICROMAP_WRITE_BIT_EXT = 0x200000000000ULL;
    // Provided by VK_NV_optical_flow
    static const VkAccessFlagBits2 VK_ACCESS_2_OPTICAL_FLOW_READ_BIT_NV = 0x40000000000ULL;
    // Provided by VK_NV_optical_flow
    static const VkAccessFlagBits2 VK_ACCESS_2_OPTICAL_FLOW_WRITE_BIT_NV = 0x80000000000ULL;

or the equivalent

    // Provided by VK_KHR_synchronization2
    typedef VkAccessFlagBits2 VkAccessFlagBits2KHR;

## Description

- `VK_ACCESS_2_NONE` specifies no accesses.

- `VK_ACCESS_2_MEMORY_READ_BIT` specifies all read accesses. It is always valid in any access mask, and is treated as equivalent to setting all `READ` access flags that are valid where it is used.

- `VK_ACCESS_2_MEMORY_WRITE_BIT` specifies all write accesses. It is always valid in any access mask, and is treated as equivalent to setting all `WRITE` access flags that are valid where it is used.

- `VK_ACCESS_2_INDIRECT_COMMAND_READ_BIT` specifies read access to command data read from indirect buffers as part of an indirect build, trace, drawing or dispatch command. Such access occurs in the `VK_PIPELINE_STAGE_2_DRAW_INDIRECT_BIT` pipeline stage.

- `VK_ACCESS_2_INDEX_READ_BIT` specifies read access to an index buffer as part of an indexed drawing command, bound by vkCmdBindIndexBuffer. Such access occurs in the `VK_PIPELINE_STAGE_2_INDEX_INPUT_BIT` pipeline stage.

- `VK_ACCESS_2_VERTEX_ATTRIBUTE_READ_BIT` specifies read access to a vertex buffer as part of a drawing command, bound by vkCmdBindVertexBuffers. Such access occurs in the `VK_PIPELINE_STAGE_2_VERTEX_ATTRIBUTE_INPUT_BIT` pipeline stage.

- `VK_ACCESS_2_UNIFORM_READ_BIT` specifies read access to a uniform buffer in any shader pipeline stage.

- `VK_ACCESS_2_INPUT_ATTACHMENT_READ_BIT` specifies read access to an input attachment within a render pass during subpass shading or fragment shading. Such access occurs in the `VK_PIPELINE_STAGE_2_SUBPASS_SHADING_BIT_HUAWEI` or `VK_PIPELINE_STAGE_2_FRAGMENT_SHADER_BIT` pipeline stage.

- `VK_ACCESS_2_SHADER_SAMPLED_READ_BIT` specifies read access to a uniform texel buffer or sampled image in any shader pipeline stage.

- `VK_ACCESS_2_SHADER_STORAGE_READ_BIT` specifies read access to a storage buffer, physical storage buffer, storage texel buffer, or storage image in any shader pipeline stage.

- `VK_ACCESS_2_SHADER_BINDING_TABLE_READ_BIT_KHR` specifies read access to a shader binding table in any shader pipeline stage.

- `VK_ACCESS_2_SHADER_READ_BIT` is equivalent to the logical OR of:

  - `VK_ACCESS_2_UNIFORM_READ_BIT`

  - `VK_ACCESS_2_SHADER_SAMPLED_READ_BIT`

  - `VK_ACCESS_2_SHADER_STORAGE_READ_BIT`

  - `VK_ACCESS_2_SHADER_BINDING_TABLE_READ_BIT_KHR`

- `VK_ACCESS_2_SHADER_STORAGE_WRITE_BIT` specifies write access to a storage buffer, physical storage buffer, storage texel buffer, or storage image in any shader pipeline stage.

- `VK_ACCESS_2_SHADER_WRITE_BIT` is equivalent to `VK_ACCESS_2_SHADER_STORAGE_WRITE_BIT`.

- `VK_ACCESS_2_COLOR_ATTACHMENT_READ_BIT` specifies read access to a color attachment, such as via blending (other than advanced blend operations), logic operations, or via certain subpass load operations or fragment shader tile image reads. Such access occurs in the `VK_PIPELINE_STAGE_2_COLOR_ATTACHMENT_OUTPUT_BIT` pipeline stage.

- `VK_ACCESS_2_COLOR_ATTACHMENT_WRITE_BIT` specifies write access to a color, resolve, or depth/stencil resolve attachment during a render pass or via certain subpass load and store operations. Such access occurs in the `VK_PIPELINE_STAGE_2_COLOR_ATTACHMENT_OUTPUT_BIT` pipeline stage.

- `VK_ACCESS_2_DEPTH_STENCIL_ATTACHMENT_READ_BIT` specifies read access to a depth/stencil attachment, via depth or stencil operations or certain subpass load operations. Such access occurs in the `VK_PIPELINE_STAGE_2_EARLY_FRAGMENT_TESTS_BIT` or `VK_PIPELINE_STAGE_2_LATE_FRAGMENT_TESTS_BIT` pipeline stages.

- `VK_ACCESS_2_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT` specifies write depth or stencil operations in the `VK_PIPELINE_STAGE_2_EARLY_FRAGMENT_TESTS_BIT_KHR` or `VK_PIPELINE_STAGE_2_LATE_FRAGMENT_TESTS_BIT_KHR` pipeline stages or via certain subpass load operations or fragment shader tile image reads in the `VK_PIPELINE_STAGE_2_FRAGMENT_SHADER_BIT_KHR` pipeline stage.

- `VK_ACCESS_2_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT_KHR` specifies write access to a depth/stencil attachment, via depth or stencil operations or certain subpass load and store operations. Such access occurs in the `VK_PIPELINE_STAGE_2_EARLY_FRAGMENT_TESTS_BIT` or `VK_PIPELINE_STAGE_2_LATE_FRAGMENT_TESTS_BIT` pipeline stages.

- `VK_ACCESS_2_TRANSFER_READ_BIT` specifies read access to an image or buffer in a copy operation. Such access occurs in the `VK_PIPELINE_STAGE_2_COPY_BIT`, `VK_PIPELINE_STAGE_2_BLIT_BIT`, or `VK_PIPELINE_STAGE_2_RESOLVE_BIT` pipeline stages.

- `VK_ACCESS_2_TRANSFER_WRITE_BIT` specifies write access to an image or buffer in a clear or copy operation. Such access occurs in the `VK_PIPELINE_STAGE_2_COPY_BIT`, `VK_PIPELINE_STAGE_2_BLIT_BIT`, `VK_PIPELINE_STAGE_2_CLEAR_BIT`, or `VK_PIPELINE_STAGE_2_RESOLVE_BIT` pipeline stages.

- `VK_ACCESS_2_HOST_READ_BIT` specifies read access by a host operation. Accesses of this type are not performed through a resource, but directly on memory. Such access occurs in the `VK_PIPELINE_STAGE_2_HOST_BIT` pipeline stage.

- `VK_ACCESS_2_HOST_WRITE_BIT` specifies write access by a host operation. Accesses of this type are not performed through a resource, but directly on memory. Such access occurs in the `VK_PIPELINE_STAGE_2_HOST_BIT` pipeline stage.

- `VK_ACCESS_2_CONDITIONAL_RENDERING_READ_BIT_EXT` specifies read access to a predicate as part of conditional rendering. Such access occurs in the `VK_PIPELINE_STAGE_2_CONDITIONAL_RENDERING_BIT_EXT` pipeline stage.

- `VK_ACCESS_2_TRANSFORM_FEEDBACK_WRITE_BIT_EXT` specifies write access to a transform feedback buffer made when transform feedback is active. Such access occurs in the `VK_PIPELINE_STAGE_2_TRANSFORM_FEEDBACK_BIT_EXT` pipeline stage.

- `VK_ACCESS_2_TRANSFORM_FEEDBACK_COUNTER_READ_BIT_EXT` specifies read access to a transform feedback counter buffer which is read when vkCmdBeginTransformFeedbackEXT executes. Such access occurs in the `VK_PIPELINE_STAGE_2_TRANSFORM_FEEDBACK_BIT_EXT` pipeline stage.

- `VK_ACCESS_2_TRANSFORM_FEEDBACK_COUNTER_WRITE_BIT_EXT` specifies write access to a transform feedback counter buffer which is written when vkCmdEndTransformFeedbackEXT executes. Such access occurs in the `VK_PIPELINE_STAGE_2_TRANSFORM_FEEDBACK_BIT_EXT` pipeline stage.

- `VK_ACCESS_2_COMMAND_PREPROCESS_READ_BIT_NV` specifies reads from buffer inputs to vkCmdPreprocessGeneratedCommandsNV. Such access occurs in the `VK_PIPELINE_STAGE_2_COMMAND_PREPROCESS_BIT_NV` pipeline stage.

- `VK_ACCESS_2_COMMAND_PREPROCESS_WRITE_BIT_NV` specifies writes to the target command buffer preprocess outputs. Such access occurs in the `VK_PIPELINE_STAGE_2_COMMAND_PREPROCESS_BIT_NV` pipeline stage.

- `VK_ACCESS_2_COLOR_ATTACHMENT_READ_NONCOHERENT_BIT_EXT` specifies read access to color attachments, including advanced blend operations. Such access occurs in the `VK_PIPELINE_STAGE_2_COLOR_ATTACHMENT_OUTPUT_BIT` pipeline stage.

- `VK_ACCESS_2_INVOCATION_MASK_READ_BIT_HUAWEI` specifies read access to a invocation mask image in the `VK_PIPELINE_STAGE_2_INVOCATION_MASK_BIT_HUAWEI` pipeline stage.

- `VK_ACCESS_2_ACCELERATION_STRUCTURE_READ_BIT_KHR` specifies read access to an acceleration structure as part of a trace, build, or copy command, or to an acceleration structure scratch buffer as part of a build command. Such access occurs in the `VK_PIPELINE_STAGE_2_RAY_TRACING_SHADER_BIT_KHR` pipeline stage or `VK_PIPELINE_STAGE_2_ACCELERATION_STRUCTURE_BUILD_BIT_KHR` pipeline stage.

- `VK_ACCESS_2_ACCELERATION_STRUCTURE_WRITE_BIT_KHR` specifies write access to an acceleration structure or acceleration structure scratch buffer as part of a build or copy command. Such access occurs in the `VK_PIPELINE_STAGE_2_ACCELERATION_STRUCTURE_BUILD_BIT_KHR` pipeline stage.

- `VK_ACCESS_2_FRAGMENT_DENSITY_MAP_READ_BIT_EXT` specifies read access to a fragment density map attachment during dynamic fragment density map operations. Such access occurs in the `VK_PIPELINE_STAGE_2_FRAGMENT_DENSITY_PROCESS_BIT_EXT` pipeline stage.

- `VK_ACCESS_2_FRAGMENT_SHADING_RATE_ATTACHMENT_READ_BIT_KHR` specifies read access to a fragment shading rate attachment during rasterization. Such access occurs in the `VK_PIPELINE_STAGE_2_FRAGMENT_SHADING_RATE_ATTACHMENT_BIT_KHR` pipeline stage.

- `VK_ACCESS_2_SHADING_RATE_IMAGE_READ_BIT_NV` specifies read access to a shading rate image during rasterization. Such access occurs in the `VK_PIPELINE_STAGE_2_SHADING_RATE_IMAGE_BIT_NV` pipeline stage. It is equivalent to `VK_ACCESS_2_FRAGMENT_SHADING_RATE_ATTACHMENT_READ_BIT_KHR`.

- `VK_ACCESS_2_VIDEO_DECODE_READ_BIT_KHR` specifies read access to an image or buffer resource in a video decode operation. Such access occurs in the `VK_PIPELINE_STAGE_2_VIDEO_DECODE_BIT_KHR` pipeline stage.

- `VK_ACCESS_2_VIDEO_DECODE_WRITE_BIT_KHR` specifies write access to an image or buffer resource in a video decode operation. Such access occurs in the `VK_PIPELINE_STAGE_2_VIDEO_DECODE_BIT_KHR` pipeline stage.

- `VK_ACCESS_2_VIDEO_ENCODE_READ_BIT_KHR` specifies read access to an image or buffer resource in a video encode operation. Such access occurs in the `VK_PIPELINE_STAGE_2_VIDEO_ENCODE_BIT_KHR` pipeline stage.

- `VK_ACCESS_2_VIDEO_ENCODE_WRITE_BIT_KHR` specifies write access to an image or buffer resource in a video encode operation. Such access occurs in the `VK_PIPELINE_STAGE_2_VIDEO_ENCODE_BIT_KHR` pipeline stage.

- `VK_ACCESS_2_DESCRIPTOR_BUFFER_READ_BIT_EXT` specifies read access to a descriptor buffer in any shader pipeline stage.

- `VK_ACCESS_2_OPTICAL_FLOW_READ_BIT_NV` specifies read access to an image or buffer resource as part of a optical flow operation. Such access occurs in the `VK_PIPELINE_STAGE_2_OPTICAL_FLOW_BIT_NV` pipeline stage.

- `VK_ACCESS_2_OPTICAL_FLOW_WRITE_BIT_NV` specifies write access to an image or buffer resource as part of a optical flow operation. Such access occurs in the `VK_PIPELINE_STAGE_2_OPTICAL_FLOW_BIT_NV` pipeline stage.

- `VK_ACCESS_2_MICROMAP_WRITE_BIT_EXT` specifies write access to a micromap object. Such access occurs in the `VK_PIPELINE_STAGE_2_MICROMAP_BUILD_BIT_EXT` pipeline stage.

- `VK_ACCESS_2_MICROMAP_READ_BIT_EXT` specifies read access to a micromap object. Such access occurs in the `VK_PIPELINE_STAGE_2_MICROMAP_BUILD_BIT_EXT` and `VK_PIPELINE_STAGE_2_ACCELERATION_STRUCTURE_BUILD_BIT_KHR` pipeline stages.

| Note In situations where an application wishes to select all access types for a given set of pipeline stages, `VK_ACCESS_2_MEMORY_READ_BIT` or `VK_ACCESS_2_MEMORY_WRITE_BIT` can be used. This is particularly useful when specifying stages that only have a single access type.

| Note The `VkAccessFlags2` bitmask goes beyond the 31 individual bit flags allowable within a C99 enum, which is how VkAccessFlagBits is defined. The first 31 values are common to both, and are interchangeable.

## See Also

VK_KHR_synchronization2, VK_VERSION_1_3

## 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 2014-2023 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0