-/*******************************************************************************
-
- Copyright (c) 2009, Charles McGarvey
- All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions are met:
-
- * Redistributions of source code must retain the above copyright notice,
- this list of conditions and the following disclaimer.
- * Redistributions in binary form must reproduce the above copyright notice,
- this list of conditions and the following disclaimer in the documentation
- and/or other materials provided with the distribution.
-
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-*******************************************************************************/
+/*] Copyright (c) 2009-2010, Charles McGarvey [**************************
+**] All rights reserved.
+*
+* vi:ts=4 sw=4 tw=75
+*
+* Distributable under the terms and conditions of the 2-clause BSD license;
+* see the file COPYING for a complete text of the license.
+*
+**************************************************************************/
#include <cerrno>
#include <ctime>
-#include <stdexcept>
+#include <limits>
+#include <SDL/SDL.h>
+
+#include "Log.hh"
#include "Timer.hh"
#if HAVE_CONFIG_H
namespace Mf {
-#if HAVE_CLOCK_GETTIME
+Scalar Timer::gNextFire = std::numeric_limits<Scalar>::max();
+std::map<unsigned,Timer*> Timer::gTimers;
-// Since the monotonic clock will provide us with the timer since the computer
-// started, the number of seconds since that time could easily become so large
-// that it cannot be accurately stored in a float (even with as little two days
-// uptime), therefore we need to start from a more recent reference (when the
-// program starts). Of course this isn't much of an issue if scalar is a
-// double-precision number.
-static time_t setReference_()
+unsigned Timer::getNewID()
{
- struct timespec ts;
+ static unsigned id = 1;
+ return id++;
+}
- if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0)
+
+void Timer::init(const Function& function, Scalar seconds, Mode mode)
+{
+ invalidate();
+
+ mMode = mode;
+
+ if (mMode != INVALID)
{
- return 0;
+ mFunction = function;
+
+ if (mode == ACTUAL)
+ {
+ mAbsolute = seconds;
+ }
+ else
+ {
+ mAbsolute = seconds - getTicks();
+ mInterval = seconds;
+ }
+
+ mId = getNewID();
+ gTimers.insert(std::pair<unsigned,Timer*>(mId, this));
+
+ if (mAbsolute < gNextFire) gNextFire = mAbsolute;
}
+}
- return ts.tv_sec;
+
+bool Timer::isValid() const
+{
+ return mMode != INVALID;
}
-static const time_t reference = setReference_();
+void Timer::invalidate()
+{
+ if (mMode != INVALID)
+ {
+ gTimers.erase(mId);
+ mMode = INVALID;
+ if (isEqual(mAbsolute, gNextFire)) gNextFire = findNextFire();
+ }
+}
-Scalar getTicks()
+
+void Timer::fire()
{
- struct timespec ts;
+ Scalar t = getTicks();
- if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0)
+ if (mFunction) mFunction(*this, t);
+
+ if (isRepeating())
+ {
+ Scalar absolute = mAbsolute;
+
+ if (isEqual(mAbsolute, t, 1.0)) mAbsolute += mInterval;
+ else mAbsolute = mInterval + t;
+
+ if (isEqual(absolute, gNextFire)) gNextFire = findNextFire();
+ }
+ else
{
- throw std::runtime_error("cannot access monotonic clock");
+ invalidate();
}
+}
+
+
+Scalar Timer::findNextFire()
+{
+ std::map<unsigned,Timer*>::iterator it;
+ Scalar nextFire = std::numeric_limits<Scalar>::max();
- return Scalar(ts.tv_sec - reference) + Scalar(ts.tv_nsec) / 1000000000.0;
+ for (it = gTimers.begin(); it != gTimers.end(); ++it)
+ {
+ Scalar absolute = (*it).second->mAbsolute;
+ if (absolute < nextFire) nextFire = absolute;
+ }
+
+ return nextFire;
}
-#else // ! HAVE_CLOCK_GETTIME
+Scalar Timer::getSecondsRemaining() const
+{
+ return mAbsolute - getTicks();
+}
+bool Timer::isExpired() const
+{
+ return getSecondsRemaining() < 0.0;
+}
-// If we don't have posix timers, we'll have to use a different timing method.
-// SDL only promises centisecond accuracy, but that's better than a kick in the
-// butt.
+bool Timer::isRepeating() const
+{
+ return mMode == REPEAT;
+}
-#include <SDL/SDL.h>
-Scalar getTicks()
+void Timer::fireIfExpired()
{
- Uint32 ms = SDL_GetTicks();
- return Scalar(ms / 1000) + Scalar(ms % 1000) / 1000.0;
+ fireIfExpired(getTicks());
}
+void Timer::fireIfExpired(Scalar t)
+{
+ std::map<unsigned,Timer*>::iterator it;
-#endif // HAVE_CLOCK_GETTIME
+ if (gNextFire > t) return;
+
+ for (it = gTimers.begin(); it != gTimers.end(); ++it)
+ {
+ Timer* timer = (*it).second;
+ if (timer->isExpired()) timer->fire();
+ }
+}
+
+
+#if HAVE_CLOCK_GETTIME
+
+// Since the monotonic clock will provide us with the time since the
+// computer started, the number of seconds since that time could easily
+// become so large that it cannot be accurately stored in a float (even
+// with as little two days uptime), therefore we need to start from a more
+// recent reference (when the program starts). Of course this isn't much
+// of an issue if scalar is a double-precision number.
+
+static time_t setReference_()
+{
+ struct timespec ts;
+
+ if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0)
+ {
+ return 0;
+ }
+
+ return ts.tv_sec;
+}
+
+static const time_t reference = setReference_();
+
+
+Scalar Timer::getTicks()
+{
+ struct timespec ts;
+
+ int result = clock_gettime(CLOCK_MONOTONIC, &ts);
+ ASSERT(result == 0 && "cannot access clock");
+ return Scalar(ts.tv_sec - reference) +
+ Scalar(ts.tv_nsec) / 1000000000.0;
+}
-void sleep(Scalar seconds, bool absolute)
+void Timer::sleep(Scalar seconds, Mode mode)
{
struct timespec ts;
int ret;
- if (absolute) seconds -= getTicks();
+ if (mode == ACTUAL) seconds -= getTicks();
ts.tv_sec = time_t(seconds);
ts.tv_nsec = long((seconds - Scalar(ts.tv_sec)) * 1000000000.0);
}
-} // namespace Mf
+#else // ! HAVE_CLOCK_GETTIME
-/** vim: set ts=4 sw=4 tw=80: *************************************************/
+
+// If we don't have posix timers, we'll have to use a different timing
+// method. SDL only promises centisecond accuracy, but that's better than
+// a kick in the pants.
+
+Scalar Timer::getTicks()
+{
+ Uint32 ms = SDL_GetTicks();
+ return Scalar(ms / 1000) + Scalar(ms % 1000) / 1000.0;
+}
+
+void Timer::sleep(Scalar seconds, Mode mode)
+{
+ if (mode == ACTUAL) seconds -= getTicks();
+ SDL_Delay(Uint32(cml::clamp(int(seconds * 1000.0), 0, 1000)));
+}
+
+#endif // HAVE_CLOCK_GETTIME
+
+
+} // namespace Mf
projects / chaz / yoink / blobdiff