VkSubpassResolvePerformanceQueryEXT

To query the performance characteristics of a subpass resolve operation for an attachment with a VkFormat, add a VkSubpassResolvePerformanceQueryEXT structure to the pNext chain of VkFormatProperties2.

The VkSubpassResolvePerformanceQueryEXT structure is defined as:

typedef struct VkSubpassResolvePerformanceQueryEXT {
    VkStructureType sType;
    void* pNext;
    VkBool32 optimal;
} VkSubpassResolvePerformanceQueryEXT;

• sType is a VkStructureType value identifying this structure.
• pNext is NULL or a pointer to a structure extending this structure.
• optimal specifies that a subpass resolve operation is optimally performed.

If optimal is VK_FALSE for a VkFormat, using a subpass resolve operation on a multisampled attachment with this format can incur additional costs, including additional memory bandwidth usage and a higher memory footprint. If an attachment with such a format is used in a multisampled-render-to-single-sampled subpass, the additional memory and memory bandwidth usage can nullify the benefits of using the VK_EXT_multisampled_render_to_single_sampled extension.