vkGetAndroidHardwareBufferPropertiesANDROID - Get Properties of External Memory Android Hardware Buffers

Parameters

• device is the logical device that will be importing buffer.

• buffer is the Android hardware buffer which will be imported.
• pProperties is a pointer to a AndroidHardwareBufferPropertiesANDROID structure in which the properties of buffer are returned.

Return Codes

Success

• SUCCESS

Failure

• ERROR_INVALID_EXTERNAL_HANDLE_KHR

See Also

AndroidHardwareBufferPropertiesANDROID, Device

vkGetMemoryAndroidHardwareBufferANDROID - Get an Android hardware buffer for a memory object

Parameters

• device is the logical device that created the device memory being exported.

• pInfo is a pointer to a MemoryGetAndroidHardwareBufferInfoANDROID structure containing parameters of the export operation.
• pBuffer will return an Android hardware buffer representing the underlying resources of the device memory object.

Description

Each call to getMemoryAndroidHardwareBufferANDROID must return an Android hardware buffer with a new reference acquired in addition to the reference held by the DeviceMemory. To avoid leaking resources, the application must release the reference by calling AHardwareBuffer_release when it is no longer needed. When called with the same handle in MemoryGetAndroidHardwareBufferInfoANDROID::memory, getMemoryAndroidHardwareBufferANDROID must return the same Android hardware buffer object. If the device memory was created by importing an Android hardware buffer, getMemoryAndroidHardwareBufferANDROID must return that same Android hardware buffer object.

Return Codes

Success

• SUCCESS

Failure

• ERROR_TOO_MANY_OBJECTS
• ERROR_OUT_OF_HOST_MEMORY

See Also

Device, MemoryGetAndroidHardwareBufferInfoANDROID

VkImportAndroidHardwareBufferInfoANDROID - Import memory from an Android hardware buffer

Description

If the allocateMemory command succeeds, the implementation must acquire a reference to the imported hardware buffer, which it must release when the device memory object is freed. If the command fails, the implementation must not retain a reference.

Valid Usage

• If buffer is not NULL, Android hardware buffers must be supported for import, as reported by ExternalImageFormatProperties or ExternalBufferProperties

• If buffer is not NULL, it must be a valid Android hardware buffer object with AHardwareBuffer_Desc::format and AHardwareBuffer_Desc::usage compatible with Vulkan as described in Android Hardware Buffers

Valid Usage (Implicit)

• sType must be STRUCTURE_TYPE_IMPORT_ANDROID_HARDWARE_BUFFER_INFO_ANDROID

• buffer must be a valid pointer to an AHardwareBuffer value

See Also

StructureType

VkAndroidHardwareBufferUsageANDROID - Struct containing Android hardware buffer usage flags

Description

The androidHardwareBufferUsage field must include Android hardware buffer usage flags listed in the AHardwareBuffer Usage Equivalence table when the corresponding Vulkan image usage or image creation flags are included in the usage or flags fields of PhysicalDeviceImageFormatInfo2. It must include at least one GPU usage flag (AHARDWAREBUFFER_USAGE_GPU_*), even if none of the corresponding Vulkan usages or flags are requested.

Note

Requiring at least one GPU usage flag ensures that Android hardware buffer memory will be allocated in a memory pool accessible to the Vulkan implementation, and that specializing the memory layout based on usage flags does not prevent it from being compatible with Vulkan. Implementations may avoid unnecessary restrictions caused by this requirement by using vendor usage flags to indicate that only the Vulkan uses indicated in ImageFormatProperties2 are required.

Valid Usage (Implicit)

See Also

StructureType

VkAndroidHardwareBufferPropertiesANDROID - Properties of External Memory Android Hardware Buffers

Valid Usage (Implicit)

• sType must be STRUCTURE_TYPE_ANDROID_HARDWARE_BUFFER_PROPERTIES_ANDROID

• pNext must be NULL or a pointer to a valid instance of AndroidHardwareBufferFormatPropertiesANDROID
• The sType value of each struct in the pNext chain must be unique

See Also

DeviceSize, StructureType, getAndroidHardwareBufferPropertiesANDROID

VkMemoryGetAndroidHardwareBufferInfoANDROID - Structure describing an Android hardware buffer memory export operation

Valid Usage

• EXTERNAL_MEMORY_HANDLE_TYPE_ANDROID_HARDWARE_BUFFER_BIT_ANDROID must have been included in ExportMemoryAllocateInfo::handleTypes when memory was created

• If the pNext chain of the MemoryAllocateInfo used to allocate memory included a MemoryDedicatedAllocateInfo with non-NULL image member, then that image must already be bound to memory

Valid Usage (Implicit)

• sType must be STRUCTURE_TYPE_MEMORY_GET_ANDROID_HARDWARE_BUFFER_INFO_ANDROID

• pNext must be NULL
• memory must be a valid DeviceMemory handle

See Also

DeviceMemory, StructureType, getMemoryAndroidHardwareBufferANDROID

VkAndroidHardwareBufferFormatPropertiesANDROID - Structure describing the image format properties of an Android hardware buffer

Description

If the Android hardware buffer has one of the formats listed in the Format Equivalence table, then format must have the equivalent Vulkan format listed in the table. Otherwise, format may be FORMAT_UNDEFINED, indicating the Android hardware buffer can only be used with an external format.

The formatFeatures member must include FORMAT_FEATURE_SAMPLED_IMAGE_BIT and at least one of FORMAT_FEATURE_MIDPOINT_CHROMA_SAMPLES_BIT or FORMAT_FEATURE_COSITED_CHROMA_SAMPLES_BIT, and should include FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT and FORMAT_FEATURE_SAMPLED_IMAGE_YCBCR_CONVERSION_LINEAR_FILTER_BIT.

Note

The formatFeatures member only indicates the features available when using an external-format image created from the Android hardware buffer. Images from Android hardware buffers with a format other than FORMAT_UNDEFINED are subject to the format capabilities obtained from getPhysicalDeviceFormatProperties2, and getPhysicalDeviceImageFormatProperties2 with appropriate parameters. These sets of features are independent of each other, e.g. the external format will support sampler Y′CBCR conversion even if the non-external format does not, and writing to non-external format images is possible but writing to external format images is not.

Android hardware buffers with the same external format must have the same support for FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT, FORMAT_FEATURE_MIDPOINT_CHROMA_SAMPLES_BIT, FORMAT_FEATURE_COSITED_CHROMA_SAMPLES_BIT, FORMAT_FEATURE_SAMPLED_IMAGE_YCBCR_CONVERSION_LINEAR_FILTER_BIT, FORMAT_FEATURE_SAMPLED_IMAGE_YCBCR_CONVERSION_SEPARATE_RECONSTRUCTION_FILTER_BIT, and FORMAT_FEATURE_SAMPLED_IMAGE_YCBCR_CONVERSION_CHROMA_RECONSTRUCTION_EXPLICIT_FORCEABLE_BIT. in formatFeatures. Other format features may differ between Android hardware buffers that have the same external format. This allows applications to use the same SamplerYcbcrConversion object (and samplers and pipelines created from them) for any Android hardware buffers that have the same external format.

If format is not FORMAT_UNDEFINED, then the value of samplerYcbcrConversionComponents must be valid when used as the components member of SamplerYcbcrConversionCreateInfo with that format. If format is FORMAT_UNDEFINED, all members of samplerYcbcrConversionComponents must be COMPONENT_SWIZZLE_IDENTITY.

Implementations may not always be able to determine the color model, numerical range, or chroma offsets of the image contents, so the values in AndroidHardwareBufferFormatPropertiesANDROID are only suggestions. Applications should treat these values as sensible defaults to use in the absence of more reliable information obtained through some other means. If the underlying physical device is also usable via OpenGL ES with the GL_OES_EGL_image_external extension, the implementation should suggest values that will produce similar sampled values as would be obtained by sampling the same external image via samplerExternalOES in OpenGL ES using equivalent sampler parameters.

Note

Since GL_OES_EGL_image_external does not require the same sampling and conversion calculations as Vulkan does, achieving identical results between APIs may not be possible on some implementations.

Valid Usage (Implicit)

See Also

ChromaLocation, ComponentMapping, Format, FormatFeatureFlags, SamplerYcbcrModelConversion, SamplerYcbcrRange, StructureType

VkExternalFormatANDROID - Structure containing an Android hardware buffer external format

Description

If externalFormat is zero, the effect is as if the ExternalFormatANDROID structure was not present. Otherwise, the image will have the specified external format.

Valid Usage (Implicit)

See Also

StructureType