Add metal view, shaders and renderer.

webrtc/sdk/objc/Framework/Headers/WebRTC/RTCMTLVideoView.h

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

[magjed_webrtc, 2017/02/07 12:12:41]

2017

+ *
+ *  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 <Foundation/Foundation.h>
+#import <MetalKit/MetalKit.h>
+#import "WebRTC/RTCVideoRenderer.h"
+
+NS_ASSUME_NONNULL_BEGIN
+RTC_EXPORT
+
+/**
+ * RTCMTLVideoView is thin wrapper around MTKView.
+ *
+ * It has id<RTCVideoRenderer> property that renders video frames in the view's
+ * bounds using Metal.
+ */
+@interface RTCMTLVideoView : MTKView
+
+/**
+ * Renderer class that can render RTCVideoTrack.
+ */
+@property(nonatomic, readonly) id<RTCVideoRenderer> renderer;
+
+/**
+ * Sets up the renderer.
+ *
+ * If the method returns NO it signifies the renderer is unable to perform proper setup and
+ * it's responsibility of the caller to perform all necessary clean up after this point.
+ * Unexpexted behavior can happen if the cleanup doesn't happen.

[magjed_webrtc, 2017/02/07 12:12:41]

nit: Unexpected

[daniela-webrtc, 2017/02/07 13:36:17]

Done.

+ */
+- (BOOL)setupRenderer;
+
+#pragma mark - Unavailable
+- (instancetype)init NS_UNAVAILABLE;
++ (instancetype) new NS_UNAVAILABLE;
+@end
+NS_ASSUME_NONNULL_END