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/*
* Copyright 2015 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 <Foundation/Foundation.h>
#if !TARGET_OS_IPHONE
#import "RTCNSGLVideoView.h"
#import <AppKit/NSOpenGL.h>
#import <CoreVideo/CVDisplayLink.h>
#import <OpenGL/gl3.h>
#import "RTCDefaultShader.h"
#import "RTCI420TextureCache.h"
#import "base/RTCLogging.h"
#import "base/RTCVideoFrame.h"
@interface RTC_OBJC_TYPE (RTCNSGLVideoView)
()
// `videoFrame` is set when we receive a frame from a worker thread and is read
// from the display link callback so atomicity is required.
@property(atomic, strong) RTC_OBJC_TYPE(RTCVideoFrame) *
videoFrame;
@property(atomic, strong) RTCI420TextureCache *i420TextureCache;
- (void)drawFrame;
@end
static CVReturn OnDisplayLinkFired(CVDisplayLinkRef displayLink,
const CVTimeStamp *now,
const CVTimeStamp *outputTime,
CVOptionFlags flagsIn,
CVOptionFlags *flagsOut,
void *displayLinkContext) {
RTC_OBJC_TYPE(RTCNSGLVideoView) *view =
(__bridge RTC_OBJC_TYPE(RTCNSGLVideoView) *)displayLinkContext;
[view drawFrame];
return kCVReturnSuccess;
}
@implementation RTC_OBJC_TYPE (RTCNSGLVideoView) {
CVDisplayLinkRef _displayLink;
RTC_OBJC_TYPE(RTCVideoFrame) * _lastDrawnFrame;
id<RTC_OBJC_TYPE(RTCVideoViewShading)> _shader;
}
@synthesize delegate = _delegate;
@synthesize videoFrame = _videoFrame;
@synthesize i420TextureCache = _i420TextureCache;
- (instancetype)initWithFrame:(NSRect)frame pixelFormat:(NSOpenGLPixelFormat *)format {
return [self initWithFrame:frame pixelFormat:format shader:[[RTCDefaultShader alloc] init]];
}
- (instancetype)initWithFrame:(NSRect)frame
pixelFormat:(NSOpenGLPixelFormat *)format
shader:(id<RTC_OBJC_TYPE(RTCVideoViewShading)>)shader {
if (self = [super initWithFrame:frame pixelFormat:format]) {
_shader = shader;
}
return self;
}
- (void)dealloc {
[self teardownDisplayLink];
}
- (void)drawRect:(NSRect)rect {
[self drawFrame];
}
- (void)reshape {
[super reshape];
NSRect frame = [self frame];
[self ensureGLContext];
CGLLockContext([[self openGLContext] CGLContextObj]);
glViewport(0, 0, frame.size.width, frame.size.height);
CGLUnlockContext([[self openGLContext] CGLContextObj]);
}
- (void)lockFocus {
NSOpenGLContext *context = [self openGLContext];
[super lockFocus];
if ([context view] != self) {
[context setView:self];
}
[context makeCurrentContext];
}
- (void)prepareOpenGL {
[super prepareOpenGL];
[self ensureGLContext];
glDisable(GL_DITHER);
[self setupDisplayLink];
}
- (void)clearGLContext {
[self ensureGLContext];
self.i420TextureCache = nil;
[super clearGLContext];
}
#pragma mark - RTC_OBJC_TYPE(RTCVideoRenderer)
// These methods may be called on non-main thread.
- (void)setSize:(CGSize)size {
dispatch_async(dispatch_get_main_queue(), ^{
[self.delegate videoView:self didChangeVideoSize:size];
});
}
- (void)renderFrame:(RTC_OBJC_TYPE(RTCVideoFrame) *)frame {
self.videoFrame = frame;
}
#pragma mark - Private
- (void)drawFrame {
RTC_OBJC_TYPE(RTCVideoFrame) *frame = self.videoFrame;
if (!frame || frame == _lastDrawnFrame) {
return;
}
// This method may be called from CVDisplayLink callback which isn't on the
// main thread so we have to lock the GL context before drawing.
NSOpenGLContext *context = [self openGLContext];
CGLLockContext([context CGLContextObj]);
[self ensureGLContext];
glClear(GL_COLOR_BUFFER_BIT);
// Rendering native CVPixelBuffer is not supported on OS X.
// TODO(magjed): Add support for NV12 texture cache on OS X.
frame = [frame newI420VideoFrame];
if (!self.i420TextureCache) {
self.i420TextureCache = [[RTCI420TextureCache alloc] initWithContext:context];
}
RTCI420TextureCache *i420TextureCache = self.i420TextureCache;
if (i420TextureCache) {
[i420TextureCache uploadFrameToTextures:frame];
[_shader applyShadingForFrameWithWidth:frame.width
height:frame.height
rotation:frame.rotation
yPlane:i420TextureCache.yTexture
uPlane:i420TextureCache.uTexture
vPlane:i420TextureCache.vTexture];
[context flushBuffer];
_lastDrawnFrame = frame;
}
CGLUnlockContext([context CGLContextObj]);
}
- (void)setupDisplayLink {
if (_displayLink) {
return;
}
// Synchronize buffer swaps with vertical refresh rate.
GLint swapInt = 1;
[[self openGLContext] setValues:&swapInt forParameter:NSOpenGLCPSwapInterval];
// Create display link.
CVDisplayLinkCreateWithActiveCGDisplays(&_displayLink);
CVDisplayLinkSetOutputCallback(_displayLink,
&OnDisplayLinkFired,
(__bridge void *)self);
// Set the display link for the current renderer.
CGLContextObj cglContext = [[self openGLContext] CGLContextObj];
CGLPixelFormatObj cglPixelFormat = [[self pixelFormat] CGLPixelFormatObj];
CVDisplayLinkSetCurrentCGDisplayFromOpenGLContext(
_displayLink, cglContext, cglPixelFormat);
CVDisplayLinkStart(_displayLink);
}
- (void)teardownDisplayLink {
if (!_displayLink) {
return;
}
CVDisplayLinkRelease(_displayLink);
_displayLink = NULL;
}
- (void)ensureGLContext {
NSOpenGLContext* context = [self openGLContext];
NSAssert(context, @"context shouldn't be nil");
if ([NSOpenGLContext currentContext] != context) {
[context makeCurrentContext];
}
}
@end
#endif // !TARGET_OS_IPHONE
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