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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/metal_util/device.h"
#import <Metal/Metal.h>
#include "base/logging.h"
#include "base/mac/scoped_nsobject.h"
namespace metal {
MTLDevicePtr CreateDefaultDevice() {
if (@available(macOS 10.11, *)) {
// First attempt to find a low power device to use.
base::scoped_nsprotocol<id<MTLDevice>> device_to_use;
base::scoped_nsobject<NSArray<id<MTLDevice>>> devices(MTLCopyAllDevices());
for (id<MTLDevice> device in devices.get()) {
if ([device isLowPower]) {
device_to_use.reset(device, base::scoped_policy::RETAIN);
break;
}
}
// Failing that, use the system default device.
if (!device_to_use)
device_to_use.reset(MTLCreateSystemDefaultDevice());
if (!device_to_use) {
DLOG(ERROR) << "Failed to find MTLDevice.";
return nullptr;
}
return device_to_use.release();
}
// If no device was found, or if the macOS version is too old for Metal,
// return no context provider.
return nullptr;
}
} // namespace metal
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