kc3-lang/angle

2020-09-16T00:42:08

Vulkan: Free up 5 bits in RenderPassDesc Leveraging the fact that there are only a handful of depth/stencil formats, the last element of RenderPassDesc::mAttachmentFormats can contain other information in addition to the depth/stencil format ID. The FormatID enum is rearranged such that depth/stencil formats are placed first, as a result occupying values in [1, 7]. These values take up 3 bits in an element of RenderPassDesc::mAttachmentFormats (which could be the last element if all color draw buffers are attached). As a result, the upper 5 bits of the last element of RenderPassDesc::mAttachmentFormats is unused. It is intended for these bits to be used in the implementation of multisampled-render-to-texture depth/stencil renderbuffers. Bug: angleproject:4836 Change-Id: I0786e0712539cdbbf5494ec83aeee1dd93f936dd Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2413165 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>