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/*
* Copyright (C) 2015 Tim Mayberry <mojofunk@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "pbd/windows_timer_utils.h"
#include <windows.h>
#include <mmsystem.h>
#include "pbd/compose.h"
#include "pbd/debug.h"
#include "pbd/error.h"
#include "pbd/i18n.h"
#define DEBUG_TIMING(msg) DEBUG_TRACE (PBD::DEBUG::Timing, msg);
namespace {
static
UINT&
timer_resolution ()
{
static UINT timer_res_ms = 0;
return timer_res_ms;
}
} // namespace
namespace PBD {
namespace MMTIMERS {
bool
get_min_resolution (uint32_t& min_resolution_ms)
{
TIMECAPS caps;
if (timeGetDevCaps (&caps, sizeof(TIMECAPS)) != TIMERR_NOERROR) {
DEBUG_TIMING ("Could not get timer device capabilities.\n");
return false;
}
min_resolution_ms = caps.wPeriodMin;
return true;
}
bool
set_min_resolution ()
{
uint32_t min_resolution = 0;
if (!get_min_resolution (min_resolution)) {
return false;
}
if (!set_resolution (min_resolution)) {
return false;
}
return true;
}
bool
set_resolution (uint32_t timer_resolution_ms)
{
if (timer_resolution() != 0) {
DEBUG_TIMING(
"Timer resolution must be reset before setting new resolution.\n");
}
if (timeBeginPeriod(timer_resolution_ms) != TIMERR_NOERROR) {
DEBUG_TIMING(
string_compose("Could not set timer resolution to %1(ms)\n",
timer_resolution_ms));
return false;
}
timer_resolution() = timer_resolution_ms;
DEBUG_TIMING (string_compose ("Multimedia timer resolution set to %1(ms)\n",
timer_resolution_ms));
return true;
}
bool
reset_resolution ()
{
// You must match calls to timeBegin/EndPeriod with the same resolution
if (timeEndPeriod(timer_resolution()) != TIMERR_NOERROR) {
DEBUG_TIMING("Could not reset the Timer resolution.\n");
return false;
}
DEBUG_TIMING("Reset the Timer resolution.\n");
timer_resolution() = 0;
return true;
}
} // namespace MMTIMERS
namespace {
static double timer_rate_us = 0.0;
static
bool
test_qpc_validity ()
{
int64_t last_timer_val = PBD::QPC::get_microseconds ();
if (last_timer_val < 0) return false;
for (int i = 0; i < 100000; ++i) {
int64_t timer_val = PBD::QPC::get_microseconds ();
if (timer_val < 0) return false;
// try and test for non-syncronized TSC(AMD K8/etc)
if (timer_val < last_timer_val) return false;
last_timer_val = timer_val;
}
return true;
}
} // anon namespace
namespace QPC {
bool
check_timer_valid ()
{
if (!timer_rate_us) {
return false;
}
return test_qpc_validity ();
}
bool
initialize ()
{
LARGE_INTEGER freq;
if (!QueryPerformanceFrequency(&freq) || freq.QuadPart < 1) {
info << X_("Failed to determine frequency of QPC\n") << endmsg;
timer_rate_us = 0;
} else {
timer_rate_us = 1000000.0 / freq.QuadPart;
}
info << string_compose(X_("QPC timer microseconds per tick: %1\n"),
timer_rate_us) << endmsg;
return !timer_rate_us;
}
int64_t
get_microseconds ()
{
LARGE_INTEGER current_val;
if (timer_rate_us) {
// MS docs say this will always succeed for systems >= XP but it may
// not return a monotonic value with non-invariant TSC's etc
if (QueryPerformanceCounter(¤t_val) != 0) {
return (int64_t)(current_val.QuadPart * timer_rate_us);
}
}
DEBUG_TIMING ("Could not get QPC timer\n");
return -1;
}
} // namespace QPC
int64_t
get_microseconds ()
{
if (timer_rate_us) {
return QPC::get_microseconds ();
}
// For XP systems that don't support a high-res performance counter
return g_get_monotonic_time ();
}
} // namespace PBD
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