04dbb34d51
This CL adds support in RTCEAGLVideoView for rendering CVPixelBuffers as OpenGL ES textures directly, compared to the current code that first converts the CVPixelBuffers to I420, and then reuploads them as textures. This is only supported on iOS with the use of a CVOpenGLESTextureCache. The I420 rendering and native rendering are separated in two different implementations of a simple shader interface: @protocol Shader - (BOOL)drawFrame:(RTCVideoFrame*)frame; @end GL resources are allocated when the shader is instantiated and released when the shader is destroyed. RTCEAGLVideoView will lazily instantiate the necessary shader when it receives the first frame of that kind. This is primarily done to avoid allocating GL resources for both I420 and native rendering. Some other changes are: - Print GL shader compilation errors. - Remove updateTextureSizesForFrame() function. The textures will resize automatically anyway when the texture data is uploaded with glTexImage2D(). patch from issue 2154243002 at patchset 140001 (http://crrev.com/2154243002#ps140001) Continuing magjed@'s work since he is OOO this week. BUG= Review-Url: https://codereview.webrtc.org/2202823004 Cr-Commit-Position: refs/heads/master@{#13668}
107 lines
2.3 KiB
Plaintext
107 lines
2.3 KiB
Plaintext
/*
|
|
* 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 "RTCOpenGLVideoRenderer.h"
|
|
|
|
#import "RTCShader+Private.h"
|
|
#import "WebRTC/RTCVideoFrame.h"
|
|
|
|
@implementation RTCOpenGLVideoRenderer {
|
|
GlContextType *_context;
|
|
BOOL _isInitialized;
|
|
id<RTCShader> _i420Shader;
|
|
id<RTCShader> _nv12Shader;
|
|
}
|
|
|
|
@synthesize lastDrawnFrame = _lastDrawnFrame;
|
|
|
|
+ (void)initialize {
|
|
// Disable dithering for performance.
|
|
glDisable(GL_DITHER);
|
|
}
|
|
|
|
- (instancetype)initWithContext:(GlContextType *)context {
|
|
NSAssert(context != nil, @"context cannot be nil");
|
|
if (self = [super init]) {
|
|
_context = context;
|
|
}
|
|
return self;
|
|
}
|
|
|
|
- (BOOL)drawFrame:(RTCVideoFrame *)frame {
|
|
if (!_isInitialized || !frame || frame == _lastDrawnFrame) {
|
|
return NO;
|
|
}
|
|
[self ensureGLContext];
|
|
glClear(GL_COLOR_BUFFER_BIT);
|
|
id<RTCShader> shader = nil;
|
|
#if TARGET_OS_IPHONE
|
|
if (frame.nativeHandle) {
|
|
if (!_nv12Shader) {
|
|
_nv12Shader = [[RTCNativeNV12Shader alloc] initWithContext:_context];
|
|
}
|
|
shader = _nv12Shader;
|
|
#else
|
|
// Rendering native CVPixelBuffer is not supported on OS X.
|
|
if (false) {
|
|
#endif
|
|
} else {
|
|
if (!_i420Shader) {
|
|
_i420Shader = [[RTCI420Shader alloc] initWithContext:_context];
|
|
}
|
|
shader = _i420Shader;
|
|
}
|
|
if (!shader || ![shader drawFrame:frame]) {
|
|
return NO;
|
|
}
|
|
|
|
#if !TARGET_OS_IPHONE
|
|
[_context flushBuffer];
|
|
#endif
|
|
_lastDrawnFrame = frame;
|
|
|
|
return YES;
|
|
}
|
|
|
|
- (void)setupGL {
|
|
if (_isInitialized) {
|
|
return;
|
|
}
|
|
[self ensureGLContext];
|
|
_isInitialized = YES;
|
|
}
|
|
|
|
- (void)teardownGL {
|
|
if (!_isInitialized) {
|
|
return;
|
|
}
|
|
[self ensureGLContext];
|
|
_i420Shader = nil;
|
|
_nv12Shader = nil;
|
|
_isInitialized = NO;
|
|
}
|
|
|
|
#pragma mark - Private
|
|
|
|
- (void)ensureGLContext {
|
|
NSAssert(_context, @"context shouldn't be nil");
|
|
#if TARGET_OS_IPHONE
|
|
if ([EAGLContext currentContext] != _context) {
|
|
[EAGLContext setCurrentContext:_context];
|
|
}
|
|
#else
|
|
if ([NSOpenGLContext currentContext] != _context) {
|
|
[_context makeCurrentContext];
|
|
}
|
|
#endif
|
|
}
|
|
|
|
@end
|