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/* ptwinmm.c -- portable timer implementation for win32 */
#include "porttime.h"
#include "windows.h"
#include "time.h"
TIMECAPS caps;
static long time_offset = 0;
static int time_started_flag = FALSE;
static long time_resolution;
static MMRESULT timer_id;
static PtCallback *time_callback;
void CALLBACK winmm_time_callback(UINT uID, UINT uMsg, DWORD dwUser,
DWORD dw1, DWORD dw2)
{
(*time_callback)(Pt_Time(), (void *) dwUser);
}
PtError Pt_Start(int resolution, PtCallback *callback, void *userData)
{
if (time_started_flag) return ptAlreadyStarted;
timeBeginPeriod(resolution);
time_resolution = resolution;
time_offset = timeGetTime();
time_started_flag = TRUE;
time_callback = callback;
if (callback) {
timer_id = timeSetEvent(resolution, 1, winmm_time_callback,
(DWORD) userData, TIME_PERIODIC | TIME_CALLBACK_FUNCTION);
if (!timer_id) return ptHostError;
}
return ptNoError;
}
PtError Pt_Stop()
{
if (!time_started_flag) return ptAlreadyStopped;
if (time_callback && timer_id) {
timeKillEvent(timer_id);
time_callback = NULL;
timer_id = 0;
}
time_started_flag = FALSE;
timeEndPeriod(time_resolution);
return ptNoError;
}
int Pt_Started()
{
return time_started_flag;
}
PtTimestamp Pt_Time()
{
return timeGetTime() - time_offset;
}
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