>The user writes the data to CPU mapped GPU memory first and then issues a copy command, which transforms the data to optimal compressed format.

Wouldnt this mean double gpu memory usage for uploading a potentially large image? (Even if just for the time the copy is finished)

Vulkan lets the user copy from cpu (host_visible) memory to gpu (device_local) memory without an intermediate gpu buffer, afaik there is no double vram usage there but i might be wrong on that.

Great article btw. I hope something comes out of this!