Fix indeterminism in GPU thread mode.

Source/Core/Core/Core.cpp

@@ -29,6 +29,7 @@
 #include "Core/Host.h"
 #include "Core/MemTools.h"
 #include "Core/Movie.h"
+#include "Core/NetPlayClient.h"
 #include "Core/NetPlayProto.h"
 #include "Core/PatchEngine.h"
 #include "Core/State.h"
@@ -129,6 +130,12 @@ void SetIsFramelimiterTempDisabled(bool disable)
 std::string GetStateFileName() { return s_state_filename; }
 void SetStateFileName(const std::string& val) { s_state_filename = val; }
 
+void FrameUpdateOnCPUThread()
+{
+	if (NetPlay::IsNetPlayRunning())
+		NetPlayClient::SendTimeBase();
+}
+
 // Display messages and return values
 
 // Formatted stop message

Source/Core/Core/Core.h

@@ -63,6 +63,8 @@ void SetStateFileName(const std::string& val);
 
 void SetBlockStart(u32 addr);
 
+void FrameUpdateOnCPUThread();
+
 bool ShouldSkipFrame(int skipped);
 void VideoThrottle();
 void RequestRefreshInfo();

Source/Core/Core/Movie.cpp

@@ -140,6 +140,8 @@ std::string GetInputDisplay()
 
 void FrameUpdate()
 {
+	// TODO[comex]: This runs on the GPU thread, yet it messes with the CPU
+	// state directly.  That's super sketchy.
 	g_currentFrame++;
 	if (!s_bPolled)
 		g_currentLagCount++;
@@ -164,9 +166,6 @@ void FrameUpdate()
 		FrameSkipping();
 
 	s_bPolled = false;
-
-	if (NetPlay::IsNetPlayRunning())
-		NetPlayClient::SendTimeBase();
 }
 
 // called when game is booting up, even if no movie is active,

Source/Core/Core/NetPlayClient.cpp

@@ -663,6 +663,8 @@ bool NetPlayClient::StartGame(const std::string &path)
 
 	m_dialog->AppendChat(" -- STARTING GAME -- ");
 
+	m_timebase_frame = 0;
+
 	m_is_running.store(true);
 	NetPlay_Enable(this);
 
@@ -1074,7 +1076,7 @@ void NetPlayClient::SendTimeBase()
 	*spac << (MessageId)NP_MSG_TIMEBASE;
 	*spac << (u32)timebase;
 	*spac << (u32)(timebase << 32);
-	*spac << (u32)Movie::g_currentFrame;
+	*spac << netplay_client->m_timebase_frame++;
 	netplay_client->SendAsync(spac);
 }
 

Source/Core/Core/NetPlayClient.h

@@ -143,6 +143,8 @@ private:
 	std::string m_player_name;
 	bool m_connecting;
 	TraversalClient* m_traversal_client;
+
+	u32 m_timebase_frame;
 };
 
 void NetPlay_Enable(NetPlayClient* const np);

Source/Core/VideoCommon/PixelEngine.cpp

@@ -11,6 +11,7 @@
 #include "Common/ChunkFile.h"
 #include "Common/CommonTypes.h"
 #include "Core/ConfigManager.h"
+#include "Core/Core.h"
 #include "Core/CoreTiming.h"
 #include "Core/State.h"
 #include "Core/HW/MMIO.h"
@@ -282,6 +283,8 @@ void SetFinish_OnMainThread(u64 userdata, int cyclesLate)
 	s_signal_finish_interrupt.store(1);
 	UpdateInterrupts();
 	CommandProcessor::SetInterruptFinishWaiting(false);
+
+	Core::FrameUpdateOnCPUThread();
 }
 
 // SetToken