77 lines
1.6 KiB
C++
Executable File
77 lines
1.6 KiB
C++
Executable File
// platform-independent high resolution timer and FPS measuring code
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//
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// Copyright (c) 2003 Jan Wassenberg
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// Contact info:
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// Jan.Wassenberg@stud.uni-karlsruhe.de
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// http://www.stud.uni-karlsruhe.de/~urkt/
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#ifndef TIMER_H
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#define TIMER_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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// high resolution (> 1 µs) timestamp [s], starting at or near 0 s.
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extern double get_time();
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extern double timer_res();
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// calculate fps (call once per frame)
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// several smooth filters (tuned for ~100 FPS)
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// => less fluctuation, but rapid tracking
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extern int fps;
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extern void calc_fps();
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#ifdef __cplusplus
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}
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#endif
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#include <string>
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class ScopedTimer
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{
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double t0;
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const std::string name;
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public:
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ScopedTimer(const char* _name)
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: name(_name)
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{
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t0 = get_time();
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}
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~ScopedTimer()
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{
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double t1 = get_time();
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double dt = t1-t0;
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// assume microseconds
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double scale = 1e6;
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char unit = 'µ';
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if(dt > 1.0)
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scale = 1, unit = ' ';
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// milli
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else if(dt > 1e-3)
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scale = 1e3, unit = 'm';
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printf("TIMER %s: %g %cs\n", name.c_str(), dt*scale, unit);
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}
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};
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#define TIMER(name) ScopedTimer name(#name);
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#endif // #ifndef TIMER_H
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