Commit 1e4f8b02ae0603e7034c37e0ff6cee39c38771a9
2020-12-21T23:47:47
Vulkan: Generate gl_Position.z correction in SPIR-V Instead of having the translator output code to transform gl_Position.z to Vulkan clip space in the vertex stage, this change makes the SPIR-V transformer perform this operation on the last geometry stage. An alternative solution would be to generate this transformation in the translator in every geometry stage, each controlled by a separate specialization constant. This change avoids unnecessary modifications to earlier stages. Additionally, the transformer is already modifying gl_Position.xy for pre-rotation, so the addition of a small transformation of gl_Position.z in the same spot is rather trivial. Bug: angleproject:5479 Change-Id: Id971179ba47b206204bfdaf3b2b295ef97dd5117 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2598585 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Charlie Lao <cclao@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>