From 90613a1bda4d80e4c2760ad5f3ebdefd53a19a87 Mon Sep 17 00:00:00 2001
From: degasus <wickmarkus@web.de>
Date: Sat, 15 Nov 2014 16:24:06 +0100
Subject: [PATCH] OpcodeDecoder: Skip recursiv display lists

---
 Source/Core/VideoCommon/Fifo.cpp           |  8 +++---
 Source/Core/VideoCommon/OpcodeDecoding.cpp | 29 ++++++++++++++--------
 Source/Core/VideoCommon/OpcodeDecoding.h   |  4 +--
 3 files changed, 25 insertions(+), 16 deletions(-)

diff --git a/Source/Core/VideoCommon/Fifo.cpp b/Source/Core/VideoCommon/Fifo.cpp
index 6dc9732f0a..18475a737c 100644
--- a/Source/Core/VideoCommon/Fifo.cpp
+++ b/Source/Core/VideoCommon/Fifo.cpp
@@ -251,7 +251,7 @@ static void ReadDataFromFifoOnCPU(u32 readPtr)
 		}
 	}
 	Memory::CopyFromEmu(s_video_buffer_write_ptr, readPtr, len);
-	OpcodeDecoder_Preprocess(write_ptr + len);
+	OpcodeDecoder_Preprocess(write_ptr + len, false);
 	// This would have to be locked if the GPU thread didn't spin.
 	s_video_buffer_write_ptr = write_ptr + len;
 }
@@ -289,7 +289,7 @@ void RunGpuLoop()
 			// See comment in SyncGPU
 			if (write_ptr > seen_ptr)
 			{
-				OpcodeDecoder_Run(write_ptr);
+				OpcodeDecoder_Run(write_ptr, false);
 
 				{
 					std::lock_guard<std::mutex> vblk(s_video_buffer_lock);
@@ -325,7 +325,7 @@ void RunGpuLoop()
 
 
 					u8* write_ptr = s_video_buffer_write_ptr;
-					cyclesExecuted = OpcodeDecoder_Run(write_ptr);
+					cyclesExecuted = OpcodeDecoder_Run(write_ptr, false);
 
 
 					if (SConfig::GetInstance().m_LocalCoreStartupParameter.bSyncGPU && Common::AtomicLoad(CommandProcessor::VITicks) >= cyclesExecuted)
@@ -399,7 +399,7 @@ void RunGpu()
 			FPURoundMode::SaveSIMDState();
 			FPURoundMode::LoadDefaultSIMDState();
 			ReadDataFromFifo(fifo.CPReadPointer);
-			OpcodeDecoder_Run(s_video_buffer_write_ptr);
+			OpcodeDecoder_Run(s_video_buffer_write_ptr, false);
 			FPURoundMode::LoadSIMDState();
 		}
 
diff --git a/Source/Core/VideoCommon/OpcodeDecoding.cpp b/Source/Core/VideoCommon/OpcodeDecoding.cpp
index 1f71bd051b..5c3544aecb 100644
--- a/Source/Core/VideoCommon/OpcodeDecoding.cpp
+++ b/Source/Core/VideoCommon/OpcodeDecoding.cpp
@@ -55,7 +55,7 @@ static u32 InterpretDisplayList(u32 address, u32 size)
 		Statistics::SwapDL();
 
 		u8 *end = g_video_buffer_read_ptr + size;
-		cycles = OpcodeDecoder_Run(end);
+		cycles = OpcodeDecoder_Run(end, true);
 		INCSTAT(stats.thisFrame.numDListsCalled);
 
 		// un-swap
@@ -80,7 +80,7 @@ static void InterpretDisplayListPreprocess(u32 address, u32 size)
 		g_video_buffer_pp_read_ptr = startAddress;
 
 		u8 *end = startAddress + size;
-		OpcodeDecoder_Preprocess(end);
+		OpcodeDecoder_Preprocess(end, true);
 	}
 
 	g_video_buffer_pp_read_ptr = old_read_ptr;
@@ -126,7 +126,7 @@ static void UnknownOpcode(u8 cmd_byte, void *buffer, bool preprocess)
 }
 
 template <bool is_preprocess, u8** bufp>
-static u32 Decode(u8* end)
+static u32 Decode(u8* end, bool in_display_list)
 {
 	u8 *opcodeStart = *bufp;
 	if (*bufp == end)
@@ -205,10 +205,19 @@ static u32 Decode(u8* end)
 				return 0;
 			u32 address = DataRead<u32>(bufp);
 			u32 count = DataRead<u32>(bufp);
-			if (is_preprocess)
-				InterpretDisplayListPreprocess(address, count);
+
+			if (in_display_list)
+			{
+				cycles = 6;
+				WARN_LOG(VIDEO,"recursive display list detected");
+			}
 			else
-				cycles = 6 + InterpretDisplayList(address, count);
+			{
+				if (is_preprocess)
+					InterpretDisplayListPreprocess(address, count);
+				else
+					cycles = 6 + InterpretDisplayList(address, count);
+			}
 		}
 		break;
 
@@ -297,13 +306,13 @@ void OpcodeDecoder_Shutdown()
 {
 }
 
-u32 OpcodeDecoder_Run(u8* end)
+u32 OpcodeDecoder_Run(u8* end, bool in_display_list)
 {
 	u32 totalCycles = 0;
 	while (true)
 	{
 		u8* old = g_video_buffer_read_ptr;
-		u32 cycles = Decode</*is_preprocess*/ false, &g_video_buffer_read_ptr>(end);
+		u32 cycles = Decode</*is_preprocess*/ false, &g_video_buffer_read_ptr>(end, in_display_list);
 		if (cycles == 0)
 		{
 			g_video_buffer_read_ptr = old;
@@ -314,12 +323,12 @@ u32 OpcodeDecoder_Run(u8* end)
 	return totalCycles;
 }
 
-void OpcodeDecoder_Preprocess(u8 *end)
+void OpcodeDecoder_Preprocess(u8 *end, bool in_display_list)
 {
 	while (true)
 	{
 		u8* old = g_video_buffer_pp_read_ptr;
-		u32 cycles = Decode</*is_preprocess*/ true, &g_video_buffer_pp_read_ptr>(end);
+		u32 cycles = Decode</*is_preprocess*/ true, &g_video_buffer_pp_read_ptr>(end, in_display_list);
 		if (cycles == 0)
 		{
 			g_video_buffer_pp_read_ptr = old;
diff --git a/Source/Core/VideoCommon/OpcodeDecoding.h b/Source/Core/VideoCommon/OpcodeDecoding.h
index c454590f24..a217da556e 100644
--- a/Source/Core/VideoCommon/OpcodeDecoding.h
+++ b/Source/Core/VideoCommon/OpcodeDecoding.h
@@ -40,5 +40,5 @@ extern bool g_bRecordFifoData;
 
 void OpcodeDecoder_Init();
 void OpcodeDecoder_Shutdown();
-u32 OpcodeDecoder_Run(u8* end);
-void OpcodeDecoder_Preprocess(u8* write_ptr);
+u32 OpcodeDecoder_Run(u8* end, bool in_display_list);
+void OpcodeDecoder_Preprocess(u8* end, bool in_display_list);