| // Copyright 2019 The Chromium Authors |
| // 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() { |
| // First attempt to find a low power device to use. |
| base::scoped_nsprotocol<id<MTLDevice>> device_to_use; |
| #if BUILDFLAG(IS_MAC) |
| 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; |
| } |
| } |
| #endif |
| // 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(); |
| } |
| |
| } // namespace metal |
