source/system/clickcount.cpp

@@ -0,0 +1,100 @@
+/******************/
+/*** PSX Timer  ***/
+/******************/
+
+
+#include <libapi.h>
+
+#include "system\global.h"
+#include "system\clickcount.h"
+#include "system/gp.h"
+
+
+/*****************************************************************************/
+u32		CClickCount::s_currentTime=0;
+bool	CClickCount::s_initialised=false;
+bool	CClickCount::s_paused=false;
+
+static const int COUNT_DOWN_VAL = 17200;//2150;
+static const int COUNTS_PER_FRAME_INTERNAL = 4;
+static const int COUNTS_PER_FRAME_EXTERNAL = 4096;
+
+/*****************************************************************************/
+void clockTicker()
+{
+	u32	thisGp;
+	thisGp=ReloadGP();
+
+	CClickCount::updateCurrentTime();
+	SetGP(thisGp);
+}
+
+/*****************************************************************************/
+u32 CClickCount::timeSinceLast()
+{
+	if (!s_initialised)
+		{
+		initialise();
+		m_lastTime=getCurrentTime();
+		s_initialised=true;
+		}
+
+	u32		timeSince;
+	u32		currentTime;
+	u32		lastTime;
+
+	lastTime=m_lastTime;
+	currentTime=getCurrentTime();
+	timeSince=currentTime-m_lastTime;
+
+	m_lastTime=currentTime;
+	return((timeSince*COUNTS_PER_FRAME_EXTERNAL)/COUNTS_PER_FRAME_INTERNAL);
+	return(currentTime*4096);
+}
+
+/*****************************************************************************/
+void CClickCount::initialise()
+{
+	unsigned long eventHandle;
+
+	// set up variables and environment
+
+	EnterCriticalSection();
+	eventHandle = OpenEvent( RCntCNT2, EvSpINT, EvMdINTR,(long (*)(...)) clockTicker);
+	EnableEvent( eventHandle );
+//	SetRCnt( RCntCNT2, COUNT_DOWN_VAL, RCntMdINTR|RCntMdSP);
+	SetRCnt( RCntCNT2, COUNT_DOWN_VAL, RCntMdINTR);
+	StartRCnt( RCntCNT2 );
+	ExitCriticalSection();
+}
+
+/*****************************************************************************/
+u32 CClickCount::getCurrentTime()
+{
+	return(s_currentTime);
+}
+
+/*****************************************************************************/
+void CClickCount::pauseClickCount()
+{
+	ASSERT(!s_paused);
+	s_paused = true;
+}
+
+/*****************************************************************************/
+void CClickCount::restartClickCount()
+{
+	ASSERT(s_paused);
+	s_paused = false;
+}
+
+/*****************************************************************************/
+void CClickCount::updateCurrentTime()
+{
+	if (!s_paused)
+	{
+		s_currentTime++;
+	}
+
+}
+