VkPhysicalDeviceMemoryBudgetPropertiesEXT

If the VkPhysicalDeviceMemoryBudgetPropertiesEXT structure is included in the pNext chain of VkPhysicalDeviceMemoryProperties2, it is filled with the current memory budgets and usages.

The VkPhysicalDeviceMemoryBudgetPropertiesEXT structure is defined as:

typedef struct VkPhysicalDeviceMemoryBudgetPropertiesEXT {
    VkStructureType sType;
    void* pNext;
    VkDeviceSize heapBudget[VK_MAX_MEMORY_HEAPS];
    VkDeviceSize heapUsage[VK_MAX_MEMORY_HEAPS];
} VkPhysicalDeviceMemoryBudgetPropertiesEXT;

• sType is a VkStructureType value identifying this structure.
• pNext is NULL or a pointer to a structure extending this structure.
• heapBudget is an array of VK_MAX_MEMORY_HEAPS
  VkDeviceSize values in which memory budgets are returned, with one element for each memory heap. A heap’s budget is a rough estimate of how much memory the process can allocate from that heap before allocations may fail or cause performance degradation. The budget includes any currently allocated device memory.
• heapUsage is an array of VK_MAX_MEMORY_HEAPS
  VkDeviceSize values in which memory usages are returned, with one element for each memory heap. A heap’s usage is an estimate of how much memory the process is currently using in that heap.

The values returned in this structure are not invariant. The heapBudget and heapUsage values must be zero for array elements greater than or equal to VkPhysicalDeviceMemoryProperties::memoryHeapCount. The heapBudget value must be non-zero for array elements less than VkPhysicalDeviceMemoryProperties::memoryHeapCount. The heapBudget value must be less than or equal to VkMemoryHeap::size for each heap.