Reland of Add metal view, shaders and renderer. (patchset #1 id:1 of https://codereview.webrtc.org/2711003004/ )
Reason for revert:
Re-land
Original issue's description:
> Revert of Add metal view, shaders and renderer. (patchset #18 id:340001 of https://codereview.webrtc.org/2651743007/ )
>
> Reason for revert:
> Reverting due to breakage in the Google3 import
>
> Original issue's description:
> > Add metal view, shaders and renderer.
> >
> > This CL submits standalone Metal view, renderer and shader.
> >
> > BUG=webrtc:7079
> >
> > Review-Url: https://codereview.webrtc.org/2651743007
> > Cr-Commit-Position: refs/heads/master@{#16787}
> > Committed: https://chromium.googlesource.com/external/webrtc/+/fc8c97f950a4fead4a5debe3c838942db1834010
>
> TBR=magjed@webrtc.org,kthelgason@webrtc.org,tkchin@webrtc.org,haysc@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:7079
>
> Review-Url: https://codereview.webrtc.org/2711003004
> Cr-Commit-Position: refs/heads/master@{#16788}
> Committed: https://chromium.googlesource.com/external/webrtc/+/b681aabdfcdcb22de049df3916f2dd8c40dcbf57
TBR=magjed@webrtc.org,kthelgason@webrtc.org,tkchin@webrtc.org,haysc@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=webrtc:7079
Review-Url: https://codereview.webrtc.org/2716703004
Cr-Commit-Position: refs/heads/master@{#16846}
diff --git a/webrtc/sdk/objc/Framework/Classes/Metal/RTCMTLVideoView.m b/webrtc/sdk/objc/Framework/Classes/Metal/RTCMTLVideoView.m
new file mode 100644
index 0000000..2a18736
--- /dev/null
+++ b/webrtc/sdk/objc/Framework/Classes/Metal/RTCMTLVideoView.m
@@ -0,0 +1,107 @@
+/*
+ * Copyright 2017 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 "WebRTC/RTCMTLVideoView.h"
+
+#import <Metal/Metal.h>
+#import <MetalKit/MetalKit.h>
+
+#import "WebRTC/RTCLogging.h"
+#import "WebRTC/RTCVideoFrame.h"
+
+#import "RTCMTLNV12Renderer.h"
+
+@interface RTCMTLVideoView () <MTKViewDelegate>
+@property(nonatomic, strong) id<RTCMTLRenderer> renderer;
+@property(nonatomic, strong) MTKView *metalView;
+@property(atomic, strong) RTCVideoFrame *videoFrame;
+@end
+
+@implementation RTCMTLVideoView {
+ id<RTCMTLRenderer> _renderer;
+}
+
+@synthesize renderer = _renderer;
+@synthesize metalView = _metalView;
+@synthesize videoFrame = _videoFrame;
+
+- (instancetype)initWithFrame:(CGRect)frameRect {
+ self = [super initWithFrame:frameRect];
+ if (self) {
+ [self configure];
+ }
+ return self;
+}
+
+- (instancetype)initWithCoder:(NSCoder *)aCoder {
+ self = [super initWithCoder:aCoder];
+ if (self) {
+ [self configure];
+ }
+ return self;
+}
+
+#pragma mark - Private
+
++ (BOOL)isMetalAvailable {
+#if defined(__OBJC__) && COREVIDEO_SUPPORTS_METAL
+ return YES;
+#elif
+ return NO;
+#endif
+}
+
+- (void)configure {
+ if ([RTCMTLVideoView isMetalAvailable]) {
+ _metalView = [[MTKView alloc] initWithFrame:self.bounds];
+ [self addSubview:_metalView];
+ _metalView.delegate = self;
+ _metalView.contentMode = UIViewContentModeScaleAspectFit;
+ _metalView.translatesAutoresizingMaskIntoConstraints = NO;
+ UILayoutGuide *margins = self.layoutMarginsGuide;
+ [_metalView.topAnchor constraintEqualToAnchor:margins.topAnchor].active = YES;
+ [_metalView.bottomAnchor constraintEqualToAnchor:margins.bottomAnchor].active = YES;
+ [_metalView.leftAnchor constraintEqualToAnchor:margins.leftAnchor].active = YES;
+ [_metalView.rightAnchor constraintEqualToAnchor:margins.rightAnchor].active = YES;
+
+ _renderer = [[RTCMTLNV12Renderer alloc] init];
+ if (![(RTCMTLNV12Renderer *)_renderer addRenderingDestination:_metalView]) {
+ _renderer = nil;
+ };
+ } else {
+ RTCLogError("Metal configuration falied.");
+ }
+}
+#pragma mark - MTKViewDelegate methods
+
+- (void)drawInMTKView:(nonnull MTKView *)view {
+ NSAssert(view == self.metalView, @"Receiving draw callbacks from foreign instance.");
+ [_renderer drawFrame:self.videoFrame];
+}
+
+- (void)mtkView:(MTKView *)view drawableSizeWillChange:(CGSize)size {
+}
+
+#pragma mark - RTCVideoRenderer
+
+- (void)setSize:(CGSize)size {
+ _metalView.drawableSize = size;
+ [_metalView draw];
+}
+
+- (void)renderFrame:(nullable RTCVideoFrame *)frame {
+ if (frame == nil) {
+ RTCLogInfo(@"Incoming frame is nil. Exiting render callback.");
+ return;
+ }
+ self.videoFrame = frame;
+}
+
+@end
