Unity Metal不支持iOS 32 bin旧款iPhone

Question

由于我在Unity 2017.1.2游戏中将颜色库渲染从gamma更改为线性，因此对于IOS，我必须仅使用金属（每个统一要求）。 但是，这会导致32位旧款iPhone（4S，5，..）的启动崩溃。 iOS：8,9和10 XCode：7 以下是调试窗口显示的内容：

2017-12-20 22:54:34.835 RentoFortune[732:197101] Metal GPU Frame Capture Enabled
2017-12-20 22:54:34.842 RentoFortune[732:197101] Metal API Validation Disabled
2017-12-20 22:54:34.846 RentoFortune[732:197101] *** Assertion failure in -[UnityAppController renderingAPI], /Users/deyan/Documents/RentoFortuneHQ/Bin_4.6.2.1_dev/Classes/UnityAppController+Rendering.mm:138
2017-12-20 22:54:35.481 RentoFortune[732:197101] Uncaught exception: NSInternalInconsistencyException: [UnityAppController renderingAPI] called before [UnityAppController selectRenderingApi]
(
    0   CoreFoundation                      0x25af40ef <redacted> + 150
    1   libobjc.A.dylib                     0x33f86c77 objc_exception_throw + 38
    2   CoreFoundation                      0x25af3fad <redacted> + 0
    3   Foundation                          0x267f4bc9 <redacted> + 92
    4   RentoFortune                        0x000e7cbd -[UnityAppController(Rendering) renderingAPI] + 268
    5   RentoFortune                        0x000f988d -[UnityAppController application:didFinishLaunchingWithOptions:] + 660
    6   UIKit                               0x291c0c85 <redacted> + 372
    7   UIKit                               0x293b726b <redacted> + 2442
    8   UIKit                               0x293b990f <redacted> + 1406
    9   UIKit                               0x293c45e9 <redacted> + 36
    10  UIKit                               0x293b80c7 <redacted> + 130
    11  FrontBoardServices                  0x2c5c8ec1 <redacted> + 16
    12  CoreFoundation                      0x25aba035 <redacted> + 12
    13  CoreFoundation                      0x25ab92f9 <redacted> + 216
    14  CoreFoundation                      0x25ab7e53 <redacted> + 1714
    15  CoreFoundation                      0x25a036d1 CFRunLoopRunSpecific + 476
    16  CoreFoundation                      0x25a034e3 CFRunLoopRunInMode + 106
    17  UIKit                               0x291ba867 <redacted> + 558
    18  UIKit                               0x291b5445 UIApplicationMain + 1440
    19  RentoFortune                        0x000df78f main + 206
    20  libdyld.dylib                       0x34554aaf <redacted> + 2
)
warning: could not load any Objective-C class information from the dyld shared cache. This will significantly reduce the quality of type information available.