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>* remoteVideoView;
 
 - (void)displayLogMessage:(NSString*)message;
 
 @end
 
 @interface APPRTCMainView () <NSTextFieldDelegate, RTCNSGLVideoViewDelegate>
 @end
 @implementation APPRTCMainView  {
   NSScrollView* _scrollView;
   NSView* _actionItemsView;
@@ skipping 121 matching lines @@
   }
 
   [self.delegate appRTCMainView:self
                  didEnterRoomId:roomString
                        loopback:_loopbackButton.intValue];
 }
 
 #pragma mark - RTCNSGLVideoViewDelegate
 
 - (void)videoView:(RTCNSGLVideoView*)videoView
-    didChangeVideoSize:(NSSize)size {
+didChangeVideoSize:(NSSize)size {

[magjed_webrtc, 2017/03/28 11:20:29]

Indentation must be wrong here?

[daniela-webrtc, 2017/03/28 14:58:05]

Done.

   if (videoView == _remoteVideoView) {
     _remoteVideoSize = size;
   } else if (videoView == _localVideoView) {
     _localVideoSize = size;
   } else {
     return;
   }
 
   [self setNeedsUpdateConstraints:YES];
 }
@@ skipping 15 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[] = {

[magjed_webrtc, 2017/03/28 11:20:29]

Move this and |pixelFormat| into the else-statement below.

[daniela-webrtc, 2017/03/28 14:58:05]

Done.

     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];
+  } else {
+    RTCNSGLVideoView* remote =
+        [[RTCNSGLVideoView alloc] initWithFrame:NSZeroRect pixelFormat:pixelFormat];
+    remote.delegate = self;
+    _remoteVideoView = remote;
+  }
+#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 {
@@ skipping 160 matching lines @@
   [self.mainView.remoteVideoView renderFrame:nil];
   [self.mainView.localVideoView renderFrame:nil];
 }
 
 - (void)disconnect {
   [self resetUI];
   [_client disconnect];
 }
 
 @end