Add metal view, shaders and renderer.

webrtc/sdk/objc/Framework/Classes/metal/RTCMTLVideoView.m

+/*
+ *  Copyright 2016 The WebRTC project authors. All Rights Reserved.

[kthelgason, 2017/02/03 09:17:23]

2017

[daniela-webrtc, 2017/02/07 10:51:08]

Done.

[daniela-webrtc, 2017/02/07 10:51:08]

Done.

+ *
+ *  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 "WebRTC/RTCMTLVideoView.h"

[kthelgason, 2017/02/03 09:17:23]

blank line between this files' header and system headers

https://google.github.io/styleguide/cppguide.html#Names_and_Order_of_Includes

[daniela-webrtc, 2017/02/07 10:51:08]

Done.

[daniela-webrtc, 2017/02/07 10:51:09]

Done.

+#import <Metal/Metal.h>

[kthelgason, 2017/02/03 09:17:23]

Blank line between system headers and other project headers

[daniela-webrtc, 2017/02/07 10:51:08]

Done.

[daniela-webrtc, 2017/02/07 10:51:09]

Done.

+#import "RTCNV12Renderer.h"

[kthelgason, 2017/02/03 09:17:23]

This import should be prefixed with WebRTC/

[kthelgason, 2017/02/03 09:17:23]

This import should be prefixed with WebRTC/

[daniela-webrtc, 2017/02/07 10:51:08]

The WebRTC/ prefix works only for public framework headers and RTCNV12Renderer.h
is not public header.

+
+@interface RTCMTLVideoView ()
+@property(nonatomic) id<RTCMTLRenderer> renderer;
+@end
+
+@implementation RTCMTLVideoView {
+  id<RTCMTLRenderer> _renderer;
+}
+
+@synthesize renderer = _renderer;
+
+- (instancetype)initWithFrame:(CGRect)frameRect device:(nullable id<MTLDevice>)device {
+  self = [super initWithFrame:frameRect device:device];
+  if (self) {
+    _renderer = [[RTCNV12Renderer alloc] initWithView:self];
+  }
+  return self;
+}
+
+- (BOOL)setupRenderer {
+  return [_renderer setup];
+}
+
+@end

[kthelgason, 2017/02/03 09:17:23]

I think this file should have a .mm extension, but I'm not sure. Perhaps someone
can back me up on this.

[daniela-webrtc, 2017/02/07 10:51:09]

Since this class is pure objective-c (doesn't have any cpp or objective-cpp
references) there is no need for the .mm suffix