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Dean Galvin
9b31471555
A depth plane and the color storage image that holds or receives its texels were copied image to buffer, then buffer to image. With VK_KHR_maintenance8, which the device already enables, vkCmdCopyImage copies the depth aspect directly to and from a single-component color format of its size (D32 with R32, D16 with R16), so those copies record one image copy and two barriers in place of the staging buffer round trip and three barriers. TakeStorage keeps its discard of the new depth surface before the copy. 24-bit depth, the stencil plane and every other format pair keep the buffer path, as does APS5_NO_DIRECT_DEPTH_COPY=1. The graphics Context now carries the maintenance8 flag. No performance claim is made.