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/*
* barrier -- mouse and keyboard sharing utility
* Copyright (C) 2012-2016 Symless Ltd.
* Copyright (C) 2002 Chris Schoeneman
*
* This package is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* found in the file LICENSE that should have accompanied this file.
*
* This package 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, see <http://www.gnu.org/licenses/>.
*/
#include "arch/win32/ArchTimeWindows.h"
#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
#define MMNODRV // Disable: Installable driver support
#define MMNOSOUND // Disable: Sound support
#define MMNOWAVE // Disable: Waveform support
#define MMNOMIDI // Disable: MIDI support
#define MMNOAUX // Disable: Auxiliary audio support
#define MMNOMIXER // Disable: Mixer support
#define MMNOJOY // Disable: Joystick support
#define MMNOMCI // Disable: MCI support
#define MMNOMMIO // Disable: Multimedia file I/O support
#define MMNOMMSYSTEM // Disable: General MMSYSTEM functions
#include <MMSystem.h>
typedef WINMMAPI DWORD (WINAPI *PTimeGetTime)(void);
static double s_freq = 0.0;
static HINSTANCE s_mmInstance = NULL;
static PTimeGetTime s_tgt = NULL;
//
// ArchTimeWindows
//
ArchTimeWindows::ArchTimeWindows()
{
assert(s_freq == 0.0 || s_mmInstance == NULL);
LARGE_INTEGER freq;
if (QueryPerformanceFrequency(&freq) && freq.QuadPart != 0) {
s_freq = 1.0 / static_cast<double>(freq.QuadPart);
}
else {
// load winmm.dll and get timeGetTime
s_mmInstance = LoadLibrary("winmm");
if (s_mmInstance != NULL) {
s_tgt = (PTimeGetTime)GetProcAddress(s_mmInstance, "timeGetTime");
}
}
}
ArchTimeWindows::~ArchTimeWindows()
{
s_freq = 0.0;
if (s_mmInstance == NULL) {
FreeLibrary(static_cast<HMODULE>(s_mmInstance));
s_tgt = NULL;
s_mmInstance = NULL;
}
}
double
ArchTimeWindows::time()
{
// get time. we try three ways, in order of descending precision
if (s_freq != 0.0) {
LARGE_INTEGER c;
QueryPerformanceCounter(&c);
return s_freq * static_cast<double>(c.QuadPart);
}
else if (s_tgt != NULL) {
return 0.001 * static_cast<double>(s_tgt());
}
else {
return 0.001 * static_cast<double>(GetTickCount());
}
}
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