MacOS: Add metal renderer and view.

webrtc/examples/objc/AppRTCMobile/mac/APPRTCViewController.m

 /*
  *  Copyright 2014 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #import "APPRTCViewController.h"
 
 #import <AVFoundation/AVFoundation.h>
 
+#import "WebRTC/RTCMTLNSVideoView.h"
 #import "WebRTC/RTCNSGLVideoView.h"
 #import "WebRTC/RTCVideoTrack.h"
 
 #import "ARDAppClient.h"
 
 static NSUInteger const kContentWidth = 900;
 static NSUInteger const kRoomFieldWidth = 200;
 static NSUInteger const kActionItemHeight = 30;
 static NSUInteger const kBottomViewHeight = 200;
 
 @class APPRTCMainView;
 @protocol APPRTCMainViewDelegate
 
 - (void)appRTCMainView:(APPRTCMainView*)mainView
         didEnterRoomId:(NSString*)roomId
               loopback:(BOOL)isLoopback;
 
 @end
 
 @interface APPRTCMainView : NSView
 
 @property(nonatomic, weak) id<APPRTCMainViewDelegate> delegate;
-@property(nonatomic, readonly) RTCNSGLVideoView* localVideoView;
-@property(nonatomic, readonly) RTCNSGLVideoView* remoteVideoView;
+@property(nonatomic, readonly) NSView<RTCVideoRenderer>* localVideoView;
+@property(nonatomic, readonly) NSView<RTCVideoRenderer>* remoteVideoView;
 
 - (void)displayLogMessage:(NSString*)message;
 
 @end
 
 @interface APPRTCMainView () <NSTextFieldDelegate, RTCNSGLVideoViewDelegate>
 @end
 @implementation APPRTCMainView  {
   NSScrollView* _scrollView;
   NSView* _actionItemsView;
@@ skipping 112 matching lines @@
 
 #pragma mark - Control actions
 
 - (void)startCall:(id)sender {
   NSString* roomString = _roomField.stringValue;
   // Generate room id for loopback options.
   if (_loopbackButton.intValue && [roomString isEqualToString:@""]) {
     roomString = [NSUUID UUID].UUIDString;
     roomString = [roomString stringByReplacingOccurrencesOfString:@"-" withString:@""];
   }
-
   [self.delegate appRTCMainView:self
                  didEnterRoomId:roomString
                        loopback:_loopbackButton.intValue];
+  [self setNeedsUpdateConstraints:YES];
 }
 
 #pragma mark - RTCNSGLVideoViewDelegate
 
 - (void)videoView:(RTCNSGLVideoView*)videoView
     didChangeVideoSize:(NSSize)size {
   if (videoView == _remoteVideoView) {
     _remoteVideoSize = size;
   } else if (videoView == _localVideoView) {
     _localVideoSize = size;
@@ skipping 21 matching lines @@
   [_logView setEditable:NO];
 
   [self setupActionItemsView];
 
   _scrollView = [[NSScrollView alloc] initWithFrame:NSZeroRect];
   [_scrollView setTranslatesAutoresizingMaskIntoConstraints:NO];
   [_scrollView setHasVerticalScroller:YES];
   [_scrollView setDocumentView:_logView];
   [self addSubview:_scrollView];
 
-  NSOpenGLPixelFormatAttribute attributes[] = {
-    NSOpenGLPFADoubleBuffer,
-    NSOpenGLPFADepthSize, 24,
-    NSOpenGLPFAOpenGLProfile,
-    NSOpenGLProfileVersion3_2Core,
-    0
-  };
-  NSOpenGLPixelFormat* pixelFormat =
-      [[NSOpenGLPixelFormat alloc] initWithAttributes:attributes];
-  _remoteVideoView = [[RTCNSGLVideoView alloc] initWithFrame:NSZeroRect
-                                                 pixelFormat:pixelFormat];
+
+// NOTE (daniela): Ignoring Clang diagonstic here.
+// We're performing run time check to make sure class is available on runtime.
+// If not we're providing sensible default.
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wpartial-availability"
+  if ([RTCMTLNSVideoView class]) {
+    _remoteVideoView = [[RTCMTLNSVideoView alloc] initWithFrame:NSZeroRect];
+    _localVideoView = [[RTCMTLNSVideoView alloc] initWithFrame:NSZeroRect];
+  } else {
+    NSOpenGLPixelFormatAttribute attributes[] = {
+      NSOpenGLPFADoubleBuffer,
+      NSOpenGLPFADepthSize, 24,
+      NSOpenGLPFAOpenGLProfile,
+      NSOpenGLProfileVersion3_2Core,
+      0
+    };
+    NSOpenGLPixelFormat* pixelFormat =
+    [[NSOpenGLPixelFormat alloc] initWithAttributes:attributes];
+
+    RTCNSGLVideoView* remote =
+        [[RTCNSGLVideoView alloc] initWithFrame:NSZeroRect pixelFormat:pixelFormat];
+    remote.delegate = self;
+    _remoteVideoView = remote;
+
+    RTCNSGLVideoView* local =
+        [[RTCNSGLVideoView alloc] initWithFrame:NSZeroRect pixelFormat:pixelFormat];
+    local.delegate = self;
+    _localVideoView = local;
+  }
+#pragma clang diagnostic pop
+
   [_remoteVideoView setTranslatesAutoresizingMaskIntoConstraints:NO];
-  _remoteVideoView.delegate = self;
   [self addSubview:_remoteVideoView];
-
-  _localVideoView = [[RTCNSGLVideoView alloc] initWithFrame:NSZeroRect
-                                                 pixelFormat:pixelFormat];
   [_localVideoView setTranslatesAutoresizingMaskIntoConstraints:NO];
-  _localVideoView.delegate = self;
   [self addSubview:_localVideoView];
 }
 
 - (void)setupActionItemsView {
   _actionItemsView = [[NSView alloc] initWithFrame:NSZeroRect];
   [_actionItemsView setTranslatesAutoresizingMaskIntoConstraints:NO];
   [self addSubview:_actionItemsView];
 
   _roomField = [[NSTextField alloc] initWithFrame:NSZeroRect];
   [_roomField setTranslatesAutoresizingMaskIntoConstraints:NO];
@@ skipping 154 matching lines @@
   [self.mainView.remoteVideoView renderFrame:nil];
   [self.mainView.localVideoView renderFrame:nil];
 }
 
 - (void)disconnect {
   [self resetUI];
   [_client disconnect];
 }
 
 @end