From 7bcc8a67f308201c6c1cdf19842c06a611503b3a Mon Sep 17 00:00:00 2001
From: zeromus <zeromus@users.sf.net>
Date: Tue, 16 Jun 2015 06:00:00 +0000
Subject: [PATCH] fiddle around with sdl frameadvance throttle

---
 trunk/src/drivers/sdl/sdl-throttle.cpp | 30 +++++++++++++++-----------
 trunk/src/drivers/sdl/sdl.cpp          | 11 +++++-----
 trunk/src/fceu.cpp                     |  6 +-----
 3 files changed, 25 insertions(+), 22 deletions(-)

diff --git a/trunk/src/drivers/sdl/sdl-throttle.cpp b/trunk/src/drivers/sdl/sdl-throttle.cpp
index 6832f954..ead88b63 100644
--- a/trunk/src/drivers/sdl/sdl-throttle.cpp
+++ b/trunk/src/drivers/sdl/sdl-throttle.cpp
@@ -11,7 +11,9 @@ static const double Normal  = 1.0;      // 1x speed    (around 60 fps on NTSC)
 static uint64 Lasttime, Nexttime;
 static long double desired_frametime;
 static int InFrame;
-double g_fpsScale = Normal; // used by sdl.cpp
+double fps_scale = Normal; // used by sdl.cpp
+double fps_scale_frameadvance = Normal;
+double fps_scale_unpaused = Normal;
 bool MaxSpeed = false;
 
 /* LOGMUL = exp(log(2) / 3)
@@ -31,7 +33,7 @@ void
 RefreshThrottleFPS()
 {
 	uint64 fps = FCEUI_GetDesiredFPS(); // Do >> 24 to get in Hz
-	desired_frametime = 16777216.0l / (fps * g_fpsScale);
+	desired_frametime = 16777216.0l / (fps * fps_scale);
 
 	Lasttime=0;   
 	Nexttime=0;
@@ -44,7 +46,7 @@ RefreshThrottleFPS()
 int
 SpeedThrottle()
 {
-	if(g_fpsScale >= 32)
+	if(fps_scale >= 32)
 	{
 		return 0; /* Done waiting */
 	}
@@ -92,13 +94,15 @@ SpeedThrottle()
  */
 void IncreaseEmulationSpeed(void)
 {
-	g_fpsScale *= LOGMUL;
+	fps_scale_unpaused *= LOGMUL;
     
-	if(g_fpsScale > Fastest) g_fpsScale = Fastest;
+	if(fps_scale_unpaused > Fastest) fps_scale_unpaused = Fastest;
+	
+	fps_scale = fps_scale_unpaused;
 
 	RefreshThrottleFPS();
      
-	FCEU_DispMessage("Emulation speed %.1f%%",0, g_fpsScale*100.0);
+	FCEU_DispMessage("Emulation speed %.1f%%",0, fps_scale*100.0);
 }
 
 /**
@@ -106,9 +110,11 @@ void IncreaseEmulationSpeed(void)
  */
 void DecreaseEmulationSpeed(void)
 {
-	g_fpsScale /= LOGMUL;
-	if(g_fpsScale < Slowest)
-		g_fpsScale = Slowest;
+	fps_scale_unpaused /= LOGMUL;
+	if(fps_scale_unpaused < Slowest)
+		fps_scale_unpaused = Slowest;
+
+	fps_scale = fps_scale_unpaused;
 
 	RefreshThrottleFPS();
 
@@ -125,19 +131,19 @@ FCEUD_SetEmulationSpeed(int cmd)
     
 	switch(cmd) {
 	case EMUSPEED_SLOWEST:
-		g_fpsScale = Slowest;
+		fps_scale_unpaused = Slowest;
 		break;
 	case EMUSPEED_SLOWER:
 		DecreaseEmulationSpeed();
 		break;
 	case EMUSPEED_NORMAL:
-		g_fpsScale = Normal;
+		fps_scale_unpaused = Normal;
 		break;
 	case EMUSPEED_FASTER:
 		IncreaseEmulationSpeed();
 		break;
 	case EMUSPEED_FASTEST:
-		g_fpsScale = Fastest;
+		fps_scale_unpaused = Fastest;
 		MaxSpeed = true;
 		break;
 	default:
diff --git a/trunk/src/drivers/sdl/sdl.cpp b/trunk/src/drivers/sdl/sdl.cpp
index 3985158f..b59ecb42 100644
--- a/trunk/src/drivers/sdl/sdl.cpp
+++ b/trunk/src/drivers/sdl/sdl.cpp
@@ -48,8 +48,9 @@
 #include <iostream>
 #include <fstream>
 
-
-extern double g_fpsScale;
+extern double fps_scale;
+extern double fps_scale_frameadvance;
+extern double fps_scale_unpaused;
 
 extern bool MaxSpeed;
 
@@ -402,14 +403,14 @@ FCEUD_Update(uint8 *XBuf,
 	
 	int ocount = Count;
 	// apply frame scaling to Count
-	Count = (int)(Count / g_fpsScale);
+	Count = (int)(Count / fps_scale);
 	if(Count) {
 		int32 can=GetWriteSound();
 		static int uflow=0;
 		int32 tmpcan;
 
 		// don't underflow when scaling fps
-		if(can >= GetMaxSound() && g_fpsScale==1.0) uflow=1;	/* Go into massive underflow mode. */
+		if(can >= GetMaxSound() && fps_scale==1.0) uflow=1;	/* Go into massive underflow mode. */
 
 		if(can > Count) can=Count;
 		else uflow=0;
@@ -422,7 +423,7 @@ FCEUD_Update(uint8 *XBuf,
 		//if(uflow) puts("Underflow");
 		tmpcan = GetWriteSound();
 		// don't underflow when scaling fps
-		if(g_fpsScale>1.0 || ((tmpcan < Count*0.90) && !uflow)) {
+		if(fps_scale>1.0 || ((tmpcan < Count*0.90) && !uflow)) {
 			if(XBuf && (inited&4) && !(NoWaiting & 2))
 				BlitScreen(XBuf);
 			Buffer+=can;
diff --git a/trunk/src/fceu.cpp b/trunk/src/fceu.cpp
index fe4f4f7c..4f929b11 100644
--- a/trunk/src/fceu.cpp
+++ b/trunk/src/fceu.cpp
@@ -52,11 +52,11 @@ extern void CDLoggerROMChanged();
 extern void ResetDebugStatisticsCounters();
 extern void SetMainWindowText();
 extern bool isTaseditorRecording();
+#endif
 
 extern int32 fps_scale;
 extern int32 fps_scale_unpaused;
 extern int32 fps_scale_frameadvance;
-#endif
 extern void RefreshThrottleFPS();
 
 #ifdef _S9XLUA_H
@@ -643,24 +643,20 @@ void FCEUI_Emulate(uint8 **pXBuf, int32 **SoundBuf, int32 *SoundBufSize, int ski
 		// the user is holding Frame Advance key
 		// clear paused flag temporarily
 		EmulationPaused &= ~EMULATIONPAUSED_PAUSED;
-#ifdef WIN32
 		// different emulation speed when holding Frame Advance
 		if (fps_scale_frameadvance > 0)
 		{
 			fps_scale = fps_scale_frameadvance;
 			RefreshThrottleFPS();
 		}
-#endif
 	} else
 	{
-#ifdef WIN32
 		if (fps_scale_frameadvance > 0)
 		{
 			// restore emulation speed when Frame Advance is not held
 			fps_scale = fps_scale_unpaused;
 			RefreshThrottleFPS();
 		}
-#endif
 		if (EmulationPaused & EMULATIONPAUSED_PAUSED)
 		{
 			// emulator is paused