VkFormatFeatureFlagBits - Bitmask specifying features supported by a buffer

Description

These values all have the same meaning as the equivalently named values for FormatFeatureFlags2 and may be set in linearTilingFeatures, optimalTilingFeatures, and DrmFormatModifierPropertiesEXT::drmFormatModifierTilingFeatures, specifying that the features are supported by images or image views or sampler Y′CBCR conversion objects created with the queried getPhysicalDeviceFormatProperties::format:

• FORMAT_FEATURE_SAMPLED_IMAGE_BIT specifies that an image view can be sampled from.
• FORMAT_FEATURE_STORAGE_IMAGE_BIT specifies that an image view can be used as a storage image.
• FORMAT_FEATURE_STORAGE_IMAGE_ATOMIC_BIT specifies that an image view can be used as storage image that supports atomic operations.
• FORMAT_FEATURE_COLOR_ATTACHMENT_BIT specifies that an image view can be used as a framebuffer color attachment and as an input attachment.
• FORMAT_FEATURE_COLOR_ATTACHMENT_BLEND_BIT specifies that an image view can be used as a framebuffer color attachment that supports blending.
• FORMAT_FEATURE_DEPTH_STENCIL_ATTACHMENT_BIT specifies that an image view can be used as a framebuffer depth/stencil attachment and as an input attachment.
• FORMAT_FEATURE_BLIT_SRC_BIT specifies that an image can be used as srcImage for the cmdBlitImage2 and cmdBlitImage commands.
• FORMAT_FEATURE_BLIT_DST_BIT specifies that an image can be used as dstImage for the cmdBlitImage2 and cmdBlitImage commands.

• FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT specifies that if FORMAT_FEATURE_SAMPLED_IMAGE_BIT is also set, an image view can be used with a sampler that has either of magFilter or minFilter set to FILTER_LINEAR, or mipmapMode set to SAMPLER_MIPMAP_MODE_LINEAR. If FORMAT_FEATURE_BLIT_SRC_BIT is also set, an image can be used as the srcImage to cmdBlitImage2 and cmdBlitImage with a filter of FILTER_LINEAR. This bit must only be exposed for formats that also support the FORMAT_FEATURE_SAMPLED_IMAGE_BIT or FORMAT_FEATURE_BLIT_SRC_BIT.

  If the format being queried is a depth/stencil format, this bit only specifies that the depth aspect (not the stencil aspect) of an image of this format supports linear filtering, and that linear filtering of the depth aspect is supported whether depth compare is enabled in the sampler or not. Where depth comparison is supported it may be linear filtered whether this bit is present or not, but where this bit is not present the filtered value may be computed in an implementation-dependent manner which differs from the normal rules of linear filtering. The resulting value must be in the range [0,1] and should be proportional to, or a weighted average of, the number of comparison passes or failures.

• FORMAT_FEATURE_TRANSFER_SRC_BIT specifies that an image can be used as a source image for copy commands. If the application apiVersion is Vulkan 1.0 and VK_KHR_maintenance1 is not supported, FORMAT_FEATURE_TRANSFER_SRC_BIT is implied to be set when the format feature flag is not 0.
• FORMAT_FEATURE_TRANSFER_DST_BIT specifies that an image can be used as a destination image for copy commands and clear commands. If the application apiVersion is Vulkan 1.0 and VK_KHR_maintenance1 is not supported, FORMAT_FEATURE_TRANSFER_DST_BIT is implied to be set when the format feature flag is not 0.
• FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_MINMAX_BIT specifies Image can be used as a sampled image with a min or max SamplerReductionMode. This bit must only be exposed for formats that also support the FORMAT_FEATURE_SAMPLED_IMAGE_BIT.
• FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_CUBIC_BIT_EXT specifies that Image can be used with a sampler that has either of magFilter or minFilter set to FILTER_CUBIC_EXT, or be the source image for a blit with filter set to FILTER_CUBIC_EXT. This bit must only be exposed for formats that also support the FORMAT_FEATURE_SAMPLED_IMAGE_BIT. If the format being queried is a depth/stencil format, this only specifies that the depth aspect is cubic filterable.
• FORMAT_FEATURE_MIDPOINT_CHROMA_SAMPLES_BIT specifies that an application can define a sampler Y′CBCR conversion using this format as a source, and that an image of this format can be used with a SamplerYcbcrConversionCreateInfo xChromaOffset and/or yChromaOffset of CHROMA_LOCATION_MIDPOINT. Otherwise both xChromaOffset and yChromaOffset must be CHROMA_LOCATION_COSITED_EVEN. If a format does not incorporate chroma downsampling (it is not a “422” or “420” format) but the implementation supports sampler Y′CBCR conversion for this format, the implementation must set FORMAT_FEATURE_MIDPOINT_CHROMA_SAMPLES_BIT.
• FORMAT_FEATURE_COSITED_CHROMA_SAMPLES_BIT specifies that an application can define a sampler Y′CBCR conversion using this format as a source, and that an image of this format can be used with a SamplerYcbcrConversionCreateInfo xChromaOffset and/or yChromaOffset of CHROMA_LOCATION_COSITED_EVEN. Otherwise both xChromaOffset and yChromaOffset must be CHROMA_LOCATION_MIDPOINT. If neither FORMAT_FEATURE_COSITED_CHROMA_SAMPLES_BIT nor FORMAT_FEATURE_MIDPOINT_CHROMA_SAMPLES_BIT is set, the application must not define a sampler Y′CBCR conversion using this format as a source.
• FORMAT_FEATURE_SAMPLED_IMAGE_YCBCR_CONVERSION_LINEAR_FILTER_BIT specifies that an application can define a sampler Y′CBCR conversion using this format as a source with chromaFilter set to FILTER_LINEAR.
• FORMAT_FEATURE_SAMPLED_IMAGE_YCBCR_CONVERSION_SEPARATE_RECONSTRUCTION_FILTER_BIT specifies that the format can have different chroma, min, and mag filters.
• FORMAT_FEATURE_SAMPLED_IMAGE_YCBCR_CONVERSION_CHROMA_RECONSTRUCTION_EXPLICIT_BIT specifies that reconstruction is explicit, as described in https://registry.khronos.org/vulkan/specs/latest/html/vkspec.html#textures-chroma-reconstruction. If this bit is not present, reconstruction is implicit by default.
• FORMAT_FEATURE_SAMPLED_IMAGE_YCBCR_CONVERSION_CHROMA_RECONSTRUCTION_EXPLICIT_FORCEABLE_BIT specifies that reconstruction can be forcibly made explicit by setting SamplerYcbcrConversionCreateInfo::forceExplicitReconstruction to TRUE. If the format being queried supports FORMAT_FEATURE_SAMPLED_IMAGE_YCBCR_CONVERSION_CHROMA_RECONSTRUCTION_EXPLICIT_BIT it must also support FORMAT_FEATURE_SAMPLED_IMAGE_YCBCR_CONVERSION_CHROMA_RECONSTRUCTION_EXPLICIT_FORCEABLE_BIT.
• FORMAT_FEATURE_DISJOINT_BIT specifies that a multi-planar image can have the IMAGE_CREATE_DISJOINT_BIT set during image creation. An implementation must not set FORMAT_FEATURE_DISJOINT_BIT for single-plane formats.
• FORMAT_FEATURE_FRAGMENT_DENSITY_MAP_BIT_EXT specifies that an image view can be used as a fragment density map attachment.
• FORMAT_FEATURE_FRAGMENT_SHADING_RATE_ATTACHMENT_BIT_KHR specifies that an image view can be used as a fragment shading rate attachment. An implementation must not set this feature for formats with a numeric format other than UINT, or set it as a buffer feature.
• VK_FORMAT_FEATURE_VIDEO_DECODE_OUTPUT_BIT_KHR specifies that an image view with this format can be used as a decode output picture in video decode operations.
• VK_FORMAT_FEATURE_VIDEO_DECODE_DPB_BIT_KHR specifies that an image view with this format can be used as an output reconstructed picture or an input reference picture in video decode operations.
• VK_FORMAT_FEATURE_VIDEO_ENCODE_INPUT_BIT_KHR specifies that an image view with this format can be used as an encode input picture in video encode operations.

• VK_FORMAT_FEATURE_VIDEO_ENCODE_DPB_BIT_KHR specifies that an image view with this format can be used as an output reconstructed picture or an input reference picture in video encode operations.

  Specific video profiles may have additional restrictions on the format and other image creation parameters corresponding to image views used by video coding operations that can be enumerated using the vkGetPhysicalDeviceVideoFormatPropertiesKHR command.

The following bits may be set in bufferFeatures, specifying that the features are supported by buffers or buffer views created with the queried getPhysicalDeviceFormatProperties::format:

• FORMAT_FEATURE_UNIFORM_TEXEL_BUFFER_BIT specifies that the format can be used to create a buffer view that can be bound to a DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER descriptor.
• FORMAT_FEATURE_STORAGE_TEXEL_BUFFER_BIT specifies that the format can be used to create a buffer view that can be bound to a DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER descriptor.
• FORMAT_FEATURE_STORAGE_TEXEL_BUFFER_ATOMIC_BIT specifies that atomic operations are supported on DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER with this format.
• FORMAT_FEATURE_VERTEX_BUFFER_BIT specifies that the format can be used as a vertex attribute format (VertexInputAttributeDescription::format).
• FORMAT_FEATURE_ACCELERATION_STRUCTURE_VERTEX_BUFFER_BIT_KHR specifies that the format can be used as the vertex format when creating an acceleration structure (AccelerationStructureGeometryTrianglesDataKHR::vertexFormat). This format can also be used as the vertex format in host memory when doing host acceleration structure builds.

FORMAT_FEATURE_STORAGE_IMAGE_ATOMIC_BIT and FORMAT_FEATURE_STORAGE_TEXEL_BUFFER_ATOMIC_BIT are only intended to be advertised for single-component formats, since SPIR-V atomic operations require a scalar type.

See Also

VK_VERSION_1_0, FormatFeatureFlags