mirror of
https://github.com/encounter/dawn-cmake.git
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1e657a6328
Also remove stuttering from the target names by dropping the 'dawn_' prefix. Bug: dawn:1275 Change-Id: I3263f1236f71bf23795b4b12670ad3535822a537 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/79062 Reviewed-by: Corentin Wallez <cwallez@chromium.org>
78 lines
2.1 KiB
C++
78 lines
2.1 KiB
C++
// Copyright 2019 The Dawn Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "dawn/utils/Timer.h"
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#include <CoreServices/CoreServices.h>
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#include <mach/mach.h>
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#include <mach/mach_time.h>
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namespace utils {
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class OSXTimer : public Timer {
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public:
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OSXTimer() : Timer(), mRunning(false), mSecondCoeff(0) {
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}
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~OSXTimer() override = default;
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void Start() override {
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mStartTime = mach_absolute_time();
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// Cache secondCoeff
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GetSecondCoeff();
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mRunning = true;
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}
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void Stop() override {
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mStopTime = mach_absolute_time();
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mRunning = false;
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}
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double GetElapsedTime() const override {
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if (mRunning) {
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return mSecondCoeff * (mach_absolute_time() - mStartTime);
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} else {
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return mSecondCoeff * (mStopTime - mStartTime);
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}
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}
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double GetAbsoluteTime() override {
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return GetSecondCoeff() * mach_absolute_time();
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}
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private:
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double GetSecondCoeff() {
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// If this is the first time we've run, get the timebase.
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if (mSecondCoeff == 0.0) {
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mach_timebase_info_data_t timebaseInfo;
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mach_timebase_info(&timebaseInfo);
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mSecondCoeff = timebaseInfo.numer * (1.0 / 1000000000) / timebaseInfo.denom;
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}
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return mSecondCoeff;
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}
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bool mRunning;
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uint64_t mStartTime;
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uint64_t mStopTime;
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double mSecondCoeff;
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};
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Timer* CreateTimer() {
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return new OSXTimer();
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}
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} // namespace utils
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