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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#import "flutter/shell/platform/darwin/graphics/FlutterDarwinContextMetal.h"
#include "flutter/common/graphics/persistent_cache.h"
#include "flutter/fml/logging.h"
#include "flutter/shell/common/context_options.h"
#import "flutter/shell/platform/darwin/common/framework/Headers/FlutterMacros.h"
FLUTTER_ASSERT_ARC
@implementation FlutterDarwinContextMetal
- (instancetype)initWithDefaultMTLDevice {
id<MTLDevice> device = MTLCreateSystemDefaultDevice();
return [self initWithMTLDevice:device commandQueue:[device newCommandQueue]];
}
- (instancetype)initWithMTLDevice:(id<MTLDevice>)device
commandQueue:(id<MTLCommandQueue>)commandQueue {
self = [super init];
if (self != nil) {
_device = device;
if (!_device) {
FML_DLOG(ERROR) << "Could not acquire Metal device.";
return nil;
}
_commandQueue = commandQueue;
if (!_commandQueue) {
FML_DLOG(ERROR) << "Could not create Metal command queue.";
return nil;
}
[_commandQueue setLabel:@"Flutter Main Queue"];
CVReturn cvReturn = CVMetalTextureCacheCreate(kCFAllocatorDefault, // allocator
nil, // cache attributes (nil default)
_device, // metal device
nil, // texture attributes (nil default)
&_textureCache // [out] cache
);
if (cvReturn != kCVReturnSuccess) {
FML_DLOG(ERROR) << "Could not create Metal texture cache.";
return nil;
}
// The devices are in the same "sharegroup" because they share the same device and command
// queues for now. When the resource context gets its own transfer queue, this will have to be
// refactored.
_mainContext = [self createGrContext];
_resourceContext = [self createGrContext];
if (!_mainContext || !_resourceContext) {
FML_DLOG(ERROR) << "Could not create Skia Metal contexts.";
return nil;
}
_resourceContext->setResourceCacheLimit(0u);
}
return self;
}
- (sk_sp<GrDirectContext>)createGrContext {
const auto contextOptions =
flutter::MakeDefaultContextOptions(flutter::ContextType::kRender, GrBackendApi::kMetal);
id<MTLDevice> device = _device;
id<MTLCommandQueue> commandQueue = _commandQueue;
return [FlutterDarwinContextMetal createGrContext:device commandQueue:commandQueue];
}
+ (sk_sp<GrDirectContext>)createGrContext:(id<MTLDevice>)device
commandQueue:(id<MTLCommandQueue>)commandQueue {
const auto contextOptions =
flutter::MakeDefaultContextOptions(flutter::ContextType::kRender, GrBackendApi::kMetal);
// Skia expect arguments to `MakeMetal` transfer ownership of the reference in for release later
// when the GrDirectContext is collected.
return GrDirectContext::MakeMetal((__bridge_retained void*)device,
(__bridge_retained void*)commandQueue, contextOptions);
}
- (void)dealloc {
if (_textureCache) {
CFRelease(_textureCache);
}
}
- (FlutterDarwinExternalTextureMetal*)
createExternalTextureWithIdentifier:(int64_t)textureID
texture:(NSObject<FlutterTexture>*)texture {
return [[FlutterDarwinExternalTextureMetal alloc] initWithTextureCache:_textureCache
textureID:textureID
texture:texture];
}
@end