## C Specification

The VkBindImageMemoryDeviceGroupInfo structure is defined as:

// Provided by VK_VERSION_1_1
typedef struct VkBindImageMemoryDeviceGroupInfo {
VkStructureType    sType;
const void*        pNext;
uint32_t           deviceIndexCount;
const uint32_t*    pDeviceIndices;
uint32_t           splitInstanceBindRegionCount;
const VkRect2D*    pSplitInstanceBindRegions;
} VkBindImageMemoryDeviceGroupInfo;

or the equivalent

// Provided by VK_KHR_bind_memory2 with VK_KHR_device_group
typedef VkBindImageMemoryDeviceGroupInfo VkBindImageMemoryDeviceGroupInfoKHR;

## Members

• sType is the type of this structure.

• pNext is NULL or a pointer to a structure extending this structure.

• deviceIndexCount is the number of elements in pDeviceIndices.

• pDeviceIndices is a pointer to an array of device indices.

• splitInstanceBindRegionCount is the number of elements in pSplitInstanceBindRegions.

• pSplitInstanceBindRegions is a pointer to an array of VkRect2D structures describing which regions of the image are attached to each instance of memory.

## Description

If the pNext chain of VkBindImageMemoryInfo includes a VkBindImageMemoryDeviceGroupInfo structure, then that structure determines how memory is bound to images across multiple devices in a device group.

If deviceIndexCount is greater than zero, then on device index i image is attached to the instance of the memory on the physical device with device index pDeviceIndices[i].

Let N be the number of physical devices in the logical device. If splitInstanceBindRegionCount is greater than zero, then pSplitInstanceBindRegions is a pointer to an array of N2 rectangles, where the image region specified by the rectangle at element i*N+j in resource instance i is bound to the memory instance j. The blocks of the memory that are bound to each sparse image block region use an offset in memory, relative to memoryOffset, computed as if the whole image was being bound to a contiguous range of memory. In other words, horizontally adjacent image blocks use consecutive blocks of memory, vertically adjacent image blocks are separated by the number of bytes per block multiplied by the width in blocks of image, and the block at (0,0) corresponds to memory starting at memoryOffset.

If splitInstanceBindRegionCount and deviceIndexCount are zero and the memory comes from a memory heap with the VK_MEMORY_HEAP_MULTI_INSTANCE_BIT bit set, then it is as if pDeviceIndices contains consecutive indices from zero to the number of physical devices in the logical device, minus one. In other words, by default each physical device attaches to its own instance of the memory.

If splitInstanceBindRegionCount and deviceIndexCount are zero and the memory comes from a memory heap without the VK_MEMORY_HEAP_MULTI_INSTANCE_BIT bit set, then it is as if pDeviceIndices contains an array of zeros. In other words, by default each physical device attaches to instance zero.

Valid Usage
• VUID-VkBindImageMemoryDeviceGroupInfo-deviceIndexCount-01633
At least one of deviceIndexCount and splitInstanceBindRegionCount must be zero

• VUID-VkBindImageMemoryDeviceGroupInfo-deviceIndexCount-01634
deviceIndexCount must either be zero or equal to the number of physical devices in the logical device

• VUID-VkBindImageMemoryDeviceGroupInfo-pDeviceIndices-01635
All elements of pDeviceIndices must be valid device indices

• VUID-VkBindImageMemoryDeviceGroupInfo-splitInstanceBindRegionCount-01636
splitInstanceBindRegionCount must either be zero or equal to the number of physical devices in the logical device squared

• VUID-VkBindImageMemoryDeviceGroupInfo-pSplitInstanceBindRegions-01637
Elements of pSplitInstanceBindRegions that correspond to the same instance of an image must not overlap

• VUID-VkBindImageMemoryDeviceGroupInfo-offset-01638
The offset.x member of any element of pSplitInstanceBindRegions must be a multiple of the sparse image block width (VkSparseImageFormatProperties::imageGranularity.width) of all non-metadata aspects of the image

• VUID-VkBindImageMemoryDeviceGroupInfo-offset-01639
The offset.y member of any element of pSplitInstanceBindRegions must be a multiple of the sparse image block height (VkSparseImageFormatProperties::imageGranularity.height) of all non-metadata aspects of the image

• VUID-VkBindImageMemoryDeviceGroupInfo-extent-01640
The extent.width member of any element of pSplitInstanceBindRegions must either be a multiple of the sparse image block width of all non-metadata aspects of the image, or else extent.width + offset.x must equal the width of the image subresource

• VUID-VkBindImageMemoryDeviceGroupInfo-extent-01641
The extent.height member of any element of pSplitInstanceBindRegions must either be a multiple of the sparse image block height of all non-metadata aspects of the image, or else extent.height + offset.y must equal the height of the image subresource

Valid Usage (Implicit)
• VUID-VkBindImageMemoryDeviceGroupInfo-sType-sType
sType must be VK_STRUCTURE_TYPE_BIND_IMAGE_MEMORY_DEVICE_GROUP_INFO

• VUID-VkBindImageMemoryDeviceGroupInfo-pDeviceIndices-parameter
If deviceIndexCount is not 0, pDeviceIndices must be a valid pointer to an array of deviceIndexCount uint32_t values

• VUID-VkBindImageMemoryDeviceGroupInfo-pSplitInstanceBindRegions-parameter
If splitInstanceBindRegionCount is not 0, pSplitInstanceBindRegions must be a valid pointer to an array of splitInstanceBindRegionCount VkRect2D structures