System/Library/PrivateFrameworks/CameraUI.framework
CAMMetalContext.h
@protocol MTLCommandQueue, MTLDevice;
@interface CAMMetalContext : NSObject
@property (readonly, nonatomic) id<MTLDevice> device;
@property (readonly, nonatomic) id<MTLCommandQueue> commandQueue;
- (id)init;
- (void).cxx_destruct;
@end