Commit a4f706b2ca89a3e4526a315e4d1eb9ab1d6bc322
2020-08-04T12:08:00
Metal: Use compute to generate 3D texture's mipmap. - Metal's built-in blit based mipmap generator doesn't use box filtering. Hence manual generation using compute is needed. - Compute based mipmap gen can generate up to 4 mips per pass if the base level is power of 2. - This approach can be extended to 2D/cube texture's mipmap generation in future. Bug: angleproject:4921 Bug: angleproject:2634 Change-Id: I7f997669fe39afef075b2bca2406e9424cbb3016 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2336120 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jonah Ryan-Davis <jonahr@google.com> Commit-Queue: Le Hoang Quyen <le.hoang.q@gmail.com>