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  • Hash : 98c2e169
    Author : Shahbaz Youssefi
    Date : 2022-05-20T16:17:49

    Vulkan: Reduce pre-rotation spec const to bool
    
    The specialization constant now only dictates whether x and y should be
    swapped.  The complete 8 possible states of rotation and y-flip are
    achieved by using this swap in combination with a driver uniform for x
    and y flip.
    
    Swapping is still a specialization constant to avoid degrading
    performance of dFdx/dFdy which otherwise would need both to be evaluated
    instead of one.  On platforms which don't support pre-rotation, the
    specialization constant will never change and driver uniforms entirely
    govern y-flip.  On platforms that do support pre-rotation, only two
    variations of the pipeline are needed.
    
    Bug: angleproject:7366
    Change-Id: I73f84e89fa9349d2098fa5b21573aee57d93a30c
    Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3663151
    Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
    Reviewed-by: Jamie Madill <jmadill@chromium.org>
    Reviewed-by: Lingfeng Yang <lfy@google.com>
    Reviewed-by: Charlie Lao <cclao@google.com>
    

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