Commit d151af7b0b7d4fa3e9d45f614ea177d8c174020e
2021-05-20T10:52:46
Vulkan: Improve generateMipmapsWithBlit barrier usage ImageHelper::generateMipmapsWithBlit() implements glGenerateMipmap using vkCmdBlitImage. For each level it changes layout to VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL and issue a blit. In order to keep all mipmap levels' layout consistent, it issues a vkCmdPipelineBarrier call for the the very last mipmap level to change it to VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL as well. This creates an unnecessary barrier for the next operation, that now it sees a barrier against transfer stage. This CL changes all levels to VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL so that the whole image will have consistent layout. After glGenerateMipmap call, the next reasonable usage is use it in fragment shader, so the barrier is not wasted. Bug: angleproject:5986 Change-Id: I3690ae8417d97bc504fcf036d016f289e6370526 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2909757 Commit-Queue: Charlie Lao <cclao@google.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com>