[fix] [ios] Added iOS 10.3+ Metal driver handling.

iphone/Maps/Classes/MapsAppDelegate.mm

@@ -560,7 +560,7 @@ using namespace osm_auth_ios;
   auto & f = GetFramework();
   // On some devices we have to free all belong-to-graphics memory
   // because of new OpenGL driver powered by Metal.
-  if ([AppInfo sharedInfo].isMetalDriver)
+  if ([AppInfo sharedInfo].openGLDriver == MWMOpenGLDriverMetalPre103)
   {
     f.SetRenderingDisabled(true);
     f.OnDestroyGLContext();
@@ -610,7 +610,7 @@ using namespace osm_auth_ios;
   f.SetRenderingEnabled();
   // On some devices we have to free all belong-to-graphics memory
   // because of new OpenGL driver powered by Metal.
-  if ([AppInfo sharedInfo].isMetalDriver)
+  if ([AppInfo sharedInfo].openGLDriver == MWMOpenGLDriverMetalPre103)
   {
     m2::PointU const size = ((EAGLView *)self.mapViewController.view).pixelSize;
     f.OnRecoverGLContext(static_cast<int>(size.x), static_cast<int>(size.y));

iphone/Maps/Common/AppInfo.h

@@ -1,5 +1,11 @@
 #import <Foundation/Foundation.h>
 
+typedef NS_ENUM(NSInteger, MWMOpenGLDriver) {
+  MWMOpenGLDriverRegular,
+  MWMOpenGLDriverMetalPre103, // iOS 10..10.3
+  MWMOpenGLDriverMetal
+};
+
 @interface AppInfo : NSObject
 
 + (instancetype)sharedInfo;
@@ -14,6 +20,6 @@
 @property(nonatomic, readonly) NSString * twoLetterLanguageId;
 @property(nonatomic, readonly) NSDate * buildDate;
 @property(nonatomic, readonly) NSString * deviceName;
-@property(nonatomic, readonly) BOOL isMetalDriver;
+@property(nonatomic, readonly) MWMOpenGLDriver openGLDriver;
 
 @end

iphone/Maps/Common/AppInfo.mm

@@ -242,16 +242,21 @@ NSDictionary * const kDeviceNamesWithMetalDriver = @{
   return _deviceName;
 }
 
-- (BOOL)isMetalDriver
+- (MWMOpenGLDriver)openGLDriver
 {
   struct utsname systemInfo;
   uname(&systemInfo);
   NSString * machine = @(systemInfo.machine);
   if (kDeviceNamesBeforeMetalDriver[machine] != nil)
-    return NO;
+    return MWMOpenGLDriverRegular;
   if (kDeviceNamesWithiOS10MetalDriver[machine] != nil)
-    return !isIOSVersionLessThan(10);
-  return YES;
+  {
+    if (isIOSVersionLessThan(10))
+      return MWMOpenGLDriverRegular;
+    else if (isIOSVersionLessThan(@"10.3"))
+      return MWMOpenGLDriverMetalPre103;
+  }
+  return MWMOpenGLDriverMetal;
 }
 
 @end