From 52053f5d958d9c9c7467858be3d2e07ef4e2bf19 Mon Sep 17 00:00:00 2001
From: skidau <skidau@gmail.com>
Date: Sun, 7 Apr 2013 16:27:46 +1000
Subject: [PATCH] Forced an exception check after an interrupt is generated by
 the DSP.  Changed the timing back to 3ms/5ms periods, fixing the slowdown and
 garbled AX audio. Fixed Accurate VBeam emulation when DSP HLE audio is being
 used.

---
 Source/Core/Core/Src/HW/DSP.cpp               |  1 +
 .../Core/Src/HW/DSPHLE/UCodes/UCode_Zelda.cpp | 23 +++++++------------
 .../Core/Src/HW/DSPHLE/UCodes/UCode_Zelda.h   |  2 --
 Source/Core/Core/Src/HW/SystemTimers.cpp      | 15 +++++++++---
 4 files changed, 21 insertions(+), 20 deletions(-)

diff --git a/Source/Core/Core/Src/HW/DSP.cpp b/Source/Core/Core/Src/HW/DSP.cpp
index a24c8920af..a0c597326f 100644
--- a/Source/Core/Core/Src/HW/DSP.cpp
+++ b/Source/Core/Core/Src/HW/DSP.cpp
@@ -647,6 +647,7 @@ void GenerateDSPInterruptFromDSPEmu(DSPInterruptType type, bool _bSet)
 {
 	CoreTiming::ScheduleEvent_Threadsafe(
 		0, et_GenerateDSPInterrupt, type | (_bSet<<16));
+	CoreTiming::ForceExceptionCheck(100);
 }
 
 // called whenever SystemTimers thinks the dsp deserves a few more cycles
diff --git a/Source/Core/Core/Src/HW/DSPHLE/UCodes/UCode_Zelda.cpp b/Source/Core/Core/Src/HW/DSPHLE/UCodes/UCode_Zelda.cpp
index ba9f4ec222..9d392cd6b0 100644
--- a/Source/Core/Core/Src/HW/DSPHLE/UCodes/UCode_Zelda.cpp
+++ b/Source/Core/Core/Src/HW/DSPHLE/UCodes/UCode_Zelda.cpp
@@ -112,23 +112,16 @@ u8 *CUCode_Zelda::GetARAMPointer(u32 address)
 
 void CUCode_Zelda::Update(int cycles)
 {
-	m_cycles += cycles;
-
-	if (m_cycles >= 243000)
+	if (!IsLightVersion())
 	{
-		m_cycles = 0;
-
-		if (!IsLightVersion())
-		{
-			if (m_rMailHandler.GetNextMail() == DSP_FRAME_END)
-				DSP::GenerateDSPInterruptFromDSPEmu(DSP::INT_DSP);
-		}
-
-		if (NeedsResumeMail())
-		{
-			m_rMailHandler.PushMail(DSP_RESUME);
+		if (m_rMailHandler.GetNextMail() == DSP_FRAME_END)
 			DSP::GenerateDSPInterruptFromDSPEmu(DSP::INT_DSP);
-		}
+	}
+
+	if (NeedsResumeMail())
+	{
+		m_rMailHandler.PushMail(DSP_RESUME);
+		DSP::GenerateDSPInterruptFromDSPEmu(DSP::INT_DSP);
 	}
 }
 
diff --git a/Source/Core/Core/Src/HW/DSPHLE/UCodes/UCode_Zelda.h b/Source/Core/Core/Src/HW/DSPHLE/UCodes/UCode_Zelda.h
index d105d3dea9..94a5bcea3f 100644
--- a/Source/Core/Core/Src/HW/DSPHLE/UCodes/UCode_Zelda.h
+++ b/Source/Core/Core/Src/HW/DSPHLE/UCodes/UCode_Zelda.h
@@ -275,8 +275,6 @@ private:
     u32 m_PBAddress;   // The main param block array
     u32 m_PBAddress2;  // 4 smaller param blocks
 
-	u32 m_cycles;
-
 	void ExecuteList();
 
 	u8 *GetARAMPointer(u32 address);
diff --git a/Source/Core/Core/Src/HW/SystemTimers.cpp b/Source/Core/Core/Src/HW/SystemTimers.cpp
index 5854f728cb..749ab584a1 100644
--- a/Source/Core/Core/Src/HW/SystemTimers.cpp
+++ b/Source/Core/Core/Src/HW/SystemTimers.cpp
@@ -243,6 +243,8 @@ void PreInit()
 
 void Init()
 {
+	const int fields = SConfig::GetInstance().m_LocalCoreStartupParameter.bVBeam ? 2 : 1;
+
 	if (SConfig::GetInstance().m_LocalCoreStartupParameter.bWii)
 	{
 		// AyuanX: TO BE TWEAKED
@@ -251,12 +253,19 @@ void Init()
 
 		// FYI, WII_IPC_HLE_Interface::Update is also called in WII_IPCInterface::Write32
 		const int freq = 1500;
-		const int fields = SConfig::GetInstance().m_LocalCoreStartupParameter.
-				bVBeam ? 2 : 1;
 		IPC_HLE_PERIOD = GetTicksPerSecond() / (freq * fields);
 	}
 
-	DSP_PERIOD = 12500; // TO BE TWEAKED (> 15000 breaks Lost Kingdom II)
+	if (DSP::GetDSPEmulator()->IsLLE())
+	{
+		DSP_PERIOD = 12000; // TO BE TWEAKED
+	}
+	else
+	{
+		// AX HLE uses 3ms (Wii) or 5ms (GC) timing period
+		int ms_to_process = SConfig::GetInstance().m_LocalCoreStartupParameter.bWii ? 3 : 5;
+		DSP_PERIOD = (int)(GetTicksPerSecond() / 1000) * ms_to_process / fields;
+	}
 
 	// System internal sample rate is fixed at 32KHz * 4 (16bit Stereo) / 32 bytes DMA
 	AUDIO_DMA_PERIOD = CPU_CORE_CLOCK / (AudioInterface::GetAIDSampleRate() * 4 / 32);