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-rw-r--r--src/lib/portmidi/ptwinmm.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/src/lib/portmidi/ptwinmm.c b/src/lib/portmidi/ptwinmm.c
new file mode 100644
index 00000000000..17675bd6c6a
--- /dev/null
+++ b/src/lib/portmidi/ptwinmm.c
@@ -0,0 +1,70 @@
+/* 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_PTR dwUser,
+ DWORD_PTR dw1, DWORD_PTR dw2)
+{
+ (*time_callback)(Pt_Time(), (void *) dwUser);
+}
+
+
+PMEXPORT 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_PTR) userData, TIME_PERIODIC | TIME_CALLBACK_FUNCTION);
+ if (!timer_id) return ptHostError;
+ }
+ return ptNoError;
+}
+
+
+PMEXPORT 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;
+}
+
+
+PMEXPORT int Pt_Started()
+{
+ return time_started_flag;
+}
+
+
+PMEXPORT PtTimestamp Pt_Time()
+{
+ return timeGetTime() - time_offset;
+}
+
+
+PMEXPORT void Pt_Sleep(int32_t duration)
+{
+ Sleep(duration);
+}