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optimal-layout images in Vulkan requires staging the data in a buffer first, and using the GPU to perform the copy.\nSimilarly, copying data out of an optimal-layout image requires a copy to a buffer.\nThis restriction can cause a number of inefficiencies in certain scenarios.",{"type":1902,"tag":1903,"props":1921,"children":1922},{},[1923],{"type":1907,"value":1924},"Take initializing an image for the purpose of sampling as an example, where the source of data is a file.\nThe application has to load the data to memory (one copy), then initialize the buffer (second copy) and finally copy over to the image (third copy).\nApplications can remove one copy from the above scenario by creating and memory mapping the buffer first and loading the image data from disk directly into the buffer.\nThis is not always possible, for example because the streaming and graphics subsystems of a game engine are independent, or in the case of layering, because the layer is given a pointer to the data which is already loaded from disk.",{"type":1902,"tag":1903,"props":1926,"children":1927},{},[1928],{"type":1907,"value":1929},"The extra copy involved due to it going through a buffer is not just a performance cost though.\nThe buffer that is allocated for the image copy is at least as big as the image itself, and lives for a short duration until the copy is confirmed to be done.\nWhen an application performs a large number of image initialization at the same time, such as a game loading assets, it will momentarily have twice as much memory allocated for its images (the images themselves and their staging buffers), greatly increasing its peak memory usage.\nThis can lead to out-of-memory errors on some devices.",{"type":1902,"tag":1903,"props":1931,"children":1932},{},[1933],{"type":1907,"value":1934},"This document proposes an extension that allows image data to be copied from/to host memory directly, obviating the need to perform the copy through a buffer and save on memory.\nWhile copying to an optimal layout image on the CPU has its own costs, this extension can still lead to better performance by allowing the CPU to perform some copies in parallel with the GPU.",{"type":1902,"tag":1909,"props":1936,"children":1938},{"id":1937},"_proposal",[1939],{"type":1907,"value":1940},"Proposal",{"type":1902,"tag":1903,"props":1942,"children":1943},{},[1944],{"type":1907,"value":1945},"An extension is proposed to address this issue.\nThe extension’s API is designed to be similar to buffer-image and image-image copies.",{"type":1902,"tag":1903,"props":1947,"children":1948},{},[1949],{"type":1907,"value":1950},"Introduced by this API are:",{"type":1902,"tag":1903,"props":1952,"children":1953},{},[1954],{"type":1907,"value":1955},"Features, advertising whether the implementation supports host→image, image→host and image→image copies:",{"type":1902,"tag":1957,"props":1958,"children":1963},"pre",{"className":1959,"code":1960,"language":1961,"meta":1962,"style":1962},"language-c 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