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// Copyright 2019 The Amber Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "samples/timestamp.h"
#include <cassert>
#if defined(_WIN32) || defined(_WIN64)
#define SAMPLE_PLATFORM_WINDOWS 1
#define SAMPLE_PLATFORM_POSIX 0
#elif defined(__linux__) || defined(__APPLE__)
#define SAMPLE_PLATFORM_POSIX 1
#define SAMPLE_PLATFORM_WINDOWS 0
#endif
#if SAMPLE_PLATFORM_WINDOWS
#include <windows.h>
#elif SAMPLE_PLATFORM_POSIX
#include <time.h>
#else
#error "Unknown platform"
#endif
namespace timestamp {
uint64_t SampleGetTimestampNs() {
uint64_t timestamp = 0;
#if SAMPLE_PLATFORM_WINDOWS
LARGE_INTEGER tick_per_seconds;
if (!QueryPerformanceFrequency(&tick_per_seconds)) {
return 0;
}
LARGE_INTEGER ticks;
if (!QueryPerformanceCounter(&ticks)) {
return 0;
}
double tick_duration_ns = static_cast<double>(1.0e9) /
static_cast<double>(tick_per_seconds.QuadPart);
timestamp = uint64_t(static_cast<double>(ticks.QuadPart) * tick_duration_ns);
#elif SAMPLE_PLATFORM_POSIX
struct timespec time;
if (clock_gettime(CLOCK_MONOTONIC, &time)) {
return 0;
}
timestamp = static_cast<uint64_t>((time.tv_sec * 1000000000) + time.tv_nsec);
#else
#error "Implement timestamp::SampleGetTimestampNs"
#endif
return timestamp;
}
} // namespace timestamp
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