mirror of https://github.com/axmolengine/axmol.git
136 lines
3.5 KiB
C++
136 lines
3.5 KiB
C++
/*
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Copyright 2010 Google Inc.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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#ifndef GrStopwatch_DEFINED
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#define GrStopwatch_DEFINED
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#include "GrTypes.h"
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template <typename PLATFORM_TIMER>
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/**
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* Base class for stopwatch. Relies on PLATFORM_TIMER for platform-specific
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* timer functions. PLATFORM_TIMER provides:
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* - typename TIMESTAMP : a timestamp value that can be used with Diff()
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* - static TIMESTAMP Now() : gets current timestamp
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* - static double Diff(const TIMESTAMP& begin, const TIMESTAMP& end) :
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* computes delta in seconds between two timestamps
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*/
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class GrStopwatchBase {
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public:
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/**
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* Contructor - implicit reset()
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*/
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GrStopwatchBase() {
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fRunning = false;
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fTotalElapsed = 0.0;
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}
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/**
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* begins a new lap
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*/
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void start() {
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double lastLap = lapTime();
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fTotalElapsed += lastLap;
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fRunning = true;
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fLastStart = PLATFORM_TIMER::Now();
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}
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/**
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* ends current lap (or no effect if lap not started)
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*/
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void stop() {
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double lastLap = lapTime();
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fTotalElapsed += lastLap;
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fRunning = false;
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}
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/**
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* ends current lap, resets total time
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*/
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void reset() {
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fRunning = false;
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fTotalElapsed = 0.f;
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}
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/**
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* Computes the time of all laps since last reset() including current lap
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* if lap is still running.
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*
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* @return the sum time in seconds of all laps since last reset().
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*/
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double totalTime() const {
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return fTotalElapsed + lapTime();
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}
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/**
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* Current lap time.
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*
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* @return time in seconds of current lap if one is running otherwise 0.
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*/
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double lapTime() const {
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if (fRunning) {
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PLATFORM_TIMER::Timestamp now = PLATFORM_TIMER::Now();
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return PLATFORM_TIMER::Elapsed(fLastStart, now);
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}
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return 0.0;
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}
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private:
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double fTotalElapsed;
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typename PLATFORM_TIMER::Timestamp fLastStart;
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bool fRunning;
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};
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#if GR_WIN32_BUILD
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#include <Windows.h>
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class GrWin32Timer {
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public:
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typedef LARGE_INTEGER Timestamp;
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static Timestamp Now() {
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LARGE_INTEGER now;
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QueryPerformanceCounter(&now);
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return now;
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}
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static double Elapsed(const Timestamp& begin, const Timestamp& end) {
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double diff = (double)(end.QuadPart - begin.QuadPart);
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return diff * Scale();
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}
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private:
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static double Scale() {
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static double scale;
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if (0.0 == scale) {
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LARGE_INTEGER freq;
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QueryPerformanceFrequency(&freq);
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GrAssert(0 != freq.QuadPart);
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scale = 1 / (double) freq.QuadPart;
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}
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return scale;
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}
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};
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typedef GrStopwatchBase<GrWin32Timer> GrStopwatch;
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#else
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#error "Implement platform timer for stopwatch"
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#endif
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#endif
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