kc3-lang/angle

2023-09-11T15:27:20

Vulkan: Use VK_EXT_host_image_copy for texture uploads Of all the scenarios where host image copy may be useful, this is likely the most common case. There are numerous conditions for when the copy may be done on the host: - The image format must support it, - It must be unused by the GPU, - It must not have any pending updates (this can potentially be mitigated if needed), and - It must be in a host-copyable layout. However, many texture uploads are done: - To compressed formats, where support is highly likely, - On init, where: - the image is never previously used, - the image has no previous uploads - the image is in the UNDEFINED layout which satisfies the conditions above. As a result of this change, when the upload is done on the host, creation of a temp buffer is avoided which greatly reduces memory pressure (specially during app loading which is when most texture data is uploaded) and may even improve performance (due to avoiding a double copy). Testing the first 3 frames of the following traces with a SwiftShader implementation shows the amount of buffer allocated for staged uploads changed as such: - Black Desert: 185MB -> 65MB - Genshin Impact: 125MB -> 12MB - Asphalt 9: 138MB -> 0MB Bug: angleproject:8341 Change-Id: Id71dcc4a7a0f8b67960d2d283fe9d19ce7429a03 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4856676 Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Charlie Lao <cclao@google.com> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>