# 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_INDIRECT_COMMAND_READ_BIT = 0x00000001ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_INDEX_READ_BIT = 0x00000002ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_VERTEX_ATTRIBUTE_READ_BIT = 0x00000004ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_UNIFORM_READ_BIT = 0x00000008ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_INPUT_ATTACHMENT_READ_BIT = 0x00000010ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADER_READ_BIT = 0x00000020ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADER_WRITE_BIT = 0x00000040ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_COLOR_ATTACHMENT_READ_BIT = 0x00000080ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_COLOR_ATTACHMENT_WRITE_BIT = 0x00000100ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_DEPTH_STENCIL_ATTACHMENT_READ_BIT = 0x00000200ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT = 0x00000400ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_TRANSFER_READ_BIT = 0x00000800ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_TRANSFER_WRITE_BIT = 0x00001000ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_HOST_READ_BIT = 0x00002000ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_HOST_WRITE_BIT = 0x00004000ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_MEMORY_READ_BIT = 0x00008000ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_MEMORY_WRITE_BIT = 0x00010000ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADER_SAMPLED_READ_BIT = 0x100000000ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADER_STORAGE_READ_BIT = 0x200000000ULL;
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADER_STORAGE_WRITE_BIT = 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;
    // Provided by VK_EXT_descriptor_heap
    static const VkAccessFlagBits2 VK_ACCESS_2_SAMPLER_HEAP_READ_BIT_EXT = 0x200000000000000ULL;
    // Provided by VK_EXT_descriptor_heap
    static const VkAccessFlagBits2 VK_ACCESS_2_RESOURCE_HEAP_READ_BIT_EXT = 0x400000000000000ULL;
    // Provided by VK_KHR_video_encode_queue
    static const VkAccessFlagBits2 VK_ACCESS_2_VIDEO_ENCODE_READ_BIT_KHR = 0x2000000000ULL;
    // Provided by VK_KHR_video_encode_queue
    static const VkAccessFlagBits2 VK_ACCESS_2_VIDEO_ENCODE_WRITE_BIT_KHR = 0x4000000000ULL;
    // Provided by VK_QCOM_tile_shading
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADER_TILE_ATTACHMENT_READ_BIT_QCOM = 0x8000000000000ULL;
    // Provided by VK_QCOM_tile_shading
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADER_TILE_ATTACHMENT_WRITE_BIT_QCOM = 0x10000000000000ULL;
    // Provided by VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_NONE_KHR = 0ULL;
    // Provided by VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_INDIRECT_COMMAND_READ_BIT_KHR = 0x00000001ULL;
    // Provided by VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_INDEX_READ_BIT_KHR = 0x00000002ULL;
    // Provided by VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_VERTEX_ATTRIBUTE_READ_BIT_KHR = 0x00000004ULL;
    // Provided by VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_UNIFORM_READ_BIT_KHR = 0x00000008ULL;
    // Provided by VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_INPUT_ATTACHMENT_READ_BIT_KHR = 0x00000010ULL;
    // Provided by VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADER_READ_BIT_KHR = 0x00000020ULL;
    // Provided by VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADER_WRITE_BIT_KHR = 0x00000040ULL;
    // Provided by VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_COLOR_ATTACHMENT_READ_BIT_KHR = 0x00000080ULL;
    // Provided by VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_COLOR_ATTACHMENT_WRITE_BIT_KHR = 0x00000100ULL;
    // Provided by VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_DEPTH_STENCIL_ATTACHMENT_READ_BIT_KHR = 0x00000200ULL;
    // Provided by VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT_KHR = 0x00000400ULL;
    // Provided by VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_TRANSFER_READ_BIT_KHR = 0x00000800ULL;
    // Provided by VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_TRANSFER_WRITE_BIT_KHR = 0x00001000ULL;
    // Provided by VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_HOST_READ_BIT_KHR = 0x00002000ULL;
    // Provided by VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_HOST_WRITE_BIT_KHR = 0x00004000ULL;
    // Provided by VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_MEMORY_READ_BIT_KHR = 0x00008000ULL;
    // Provided by VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_MEMORY_WRITE_BIT_KHR = 0x00010000ULL;
    // Provided by VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADER_SAMPLED_READ_BIT_KHR = 0x100000000ULL;
    // Provided by VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADER_STORAGE_READ_BIT_KHR = 0x200000000ULL;
    // Provided by VK_KHR_synchronization2
    static const VkAccessFlagBits2 VK_ACCESS_2_SHADER_STORAGE_WRITE_BIT_KHR = 0x400000000ULL;
    // 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_synchronization2 with VK_EXT_device_generated_commands
    static const VkAccessFlagBits2 VK_ACCESS_2_COMMAND_PREPROCESS_READ_BIT_EXT = 0x00020000ULL;
    // Provided by VK_KHR_synchronization2 with VK_EXT_device_generated_commands
    static const VkAccessFlagBits2 VK_ACCESS_2_COMMAND_PREPROCESS_WRITE_BIT_EXT = 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 or VK_VERSION_1_3) 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;
    // Provided by VK_ARM_data_graph
    static const VkAccessFlagBits2 VK_ACCESS_2_DATA_GRAPH_READ_BIT_ARM = 0x800000000000ULL;
    // Provided by VK_ARM_data_graph
    static const VkAccessFlagBits2 VK_ACCESS_2_DATA_GRAPH_WRITE_BIT_ARM = 0x1000000000000ULL;
    // Provided by VK_EXT_memory_decompression
    static const VkAccessFlagBits2 VK_ACCESS_2_MEMORY_DECOMPRESSION_READ_BIT_EXT = 0x80000000000000ULL;
    // Provided by VK_EXT_memory_decompression
    static const VkAccessFlagBits2 VK_ACCESS_2_MEMORY_DECOMPRESSION_WRITE_BIT_EXT = 0x100000000000000ULL;

    // Provided by VK_KHR_synchronization2
    // Equivalent to VkAccessFlagBits2
    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. It also specifies read access to command data read from indirect buffers as part of a copy command with access occurring in the VK_PIPELINE_STAGE_2_COPY_INDIRECT_BIT_KHR pipeline stage.

- VK_ACCESS_2_INDEX_READ_BIT specifies read access to an index buffer as part of an indexed drawing command, bound by vkCmdBindIndexBuffer2 and 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_SHADER_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_SHADER_SAMPLED_READ_BIT

  - VK_ACCESS_2_SHADER_STORAGE_READ_BIT

  - VK_ACCESS_2_SHADER_BINDING_TABLE_READ_BIT_KHR

  - VK_ACCESS_2_SHADER_TILE_ATTACHMENT_READ_BIT_QCOM

- 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 certain render pass load operations in the VK_PIPELINE_STAGE_2_COLOR_ATTACHMENT_OUTPUT_BIT pipeline stage or via fragment shader tile image reads in the VK_PIPELINE_STAGE_2_FRAGMENT_SHADER_BIT pipeline stage.

- VK_ACCESS_2_COLOR_ATTACHMENT_WRITE_BIT specifies write access to a color attachment during a render pass or via certain render pass load, store, and multisample resolve operations. This includes multisample resolve operations for depth/stencil resolve attachments. 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 render pass load operations in the VK_PIPELINE_STAGE_2_EARLY_FRAGMENT_TESTS_BIT or VK_PIPELINE_STAGE_2_LATE_FRAGMENT_TESTS_BIT pipeline stages or via fragment shader tile image reads in the VK_PIPELINE_STAGE_2_FRAGMENT_SHADER_BIT pipeline stage.

- VK_ACCESS_2_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT specifies write access to a depth/stencil attachment, via depth or stencil operations or certain render pass 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_COMMAND_PREPROCESS_READ_BIT_EXT specifies reads from buffer inputs to vkCmdPreprocessGeneratedCommandsEXT. Such access occurs in the VK_PIPELINE_STAGE_2_COMMAND_PREPROCESS_BIT_EXT pipeline stage.

- VK_ACCESS_2_COMMAND_PREPROCESS_WRITE_BIT_EXT specifies writes to the target command buffer preprocess outputs. Such access occurs in the VK_PIPELINE_STAGE_2_COMMAND_PREPROCESS_BIT_EXT pipeline stage.

- VK_ACCESS_2_MEMORY_DECOMPRESSION_READ_BIT_EXT specifies read access to memory in decompression commands vkCmdDecompressMemoryEXT and vkCmdDecompressMemoryIndirectCountEXT. Such access occurs in VK_PIPELINE_STAGE_2_MEMORY_DECOMPRESSION_BIT_EXT pipeline stage.

- VK_ACCESS_2_MEMORY_DECOMPRESSION_WRITE_BIT_EXT specifies write access to memory in decompression commands vkCmdDecompressMemoryEXT and vkCmdDecompressMemoryIndirectCountEXT. Such access occurs in VK_PIPELINE_STAGE_2_MEMORY_DECOMPRESSION_BIT_EXT 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 an 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.

- VK_ACCESS_2_SHADER_TILE_ATTACHMENT_READ_BIT_QCOM specifies read access to a tile attachment. Such access occurs in the VK_PIPELINE_STAGE_2_FRAGMENT_SHADER_BIT or VK_PIPELINE_STAGE_2_COMPUTE_SHADER_BIT pipeline stages.

- VK_ACCESS_2_SHADER_TILE_ATTACHMENT_WRITE_BIT_QCOM specifies write access to a tile attachment. Such access occurs in the VK_PIPELINE_STAGE_2_FRAGMENT_SHADER_BIT or VK_PIPELINE_STAGE_2_COMPUTE_SHADER_BIT pipeline stages.

- VK_ACCESS_2_DATA_GRAPH_READ_BIT_ARM specifies read access to resources in the VK_PIPELINE_STAGE_2_DATA_GRAPH_BIT_ARM pipeline stage.

- VK_ACCESS_2_DATA_GRAPH_WRITE_BIT_ARM specifies write access to resources in the VK_PIPELINE_STAGE_2_DATA_GRAPH_BIT_ARM pipeline stage.

- VK_ACCESS_2_SAMPLER_HEAP_READ_BIT_EXT specifies read access to a sampler heap in any shader pipeline stage.

- VK_ACCESS_2_RESOURCE_HEAP_READ_BIT_EXT specifies read access to a resource heap in any shader pipeline stage.

Certain access types are only performed by a subset of pipeline stages, as described in more detail for VkAccessFlagBits. The Supported Access Types table lists, for each access flag, which pipeline stages can perform that type of access.

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, VkAccessFlags2

## 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 2014-2026 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0