Method PostVsyncStart

pcsx2/MTGS.cpp:239–281

};

void MTGS::PostVsyncStart(bool registers_written)
{
	// Optimization note: Typically regset1 isn't needed.  The regs in that area are typically
	// changed infrequently, usually during video mode changes.  However, on modern systems the
	// 256-byte copy is only a few dozen cycles -- executed 60 times a second -- so probably
	// not worth the effort or overhead of trying to selectively avoid it.

	uint packsize = sizeof(RingCmdPacket_Vsync) / 16;
	PrepDataPacket(Command::VSync, packsize);
	MemCopy_WrappedDest((u128*)PS2MEM_GS, RingBuffer.m_Ring, s_packet_writepos, RingBufferSize, 0xf);

	u32* remainder = (u32*)GetDataPacketPtr();
	remainder[0] = GSCSRr;
	remainder[1] = GSIMR._u32;
	(GSRegSIGBLID&)remainder[2] = GSSIGLBLID;
	remainder[4] = static_cast<u32>(registers_written);
	s_packet_writepos = (s_packet_writepos + 2) & RingBufferMask;

	SendDataPacket();

	// Vsyncs should always start the GS thread, regardless of how little has actually be queued.
	if (s_CopyDataTally != 0)
		SetEvent();

	// If the MTGS is allowed to queue a lot of frames in advance, it creates input lag.
	// Use the Queued FrameCount to stall the EE if another vsync (or two) are already queued
	// in the ringbuffer.  The queue limit is disabled when both FrameLimiting and Vsync are
	// disabled, since the queue can have perverse effects on framerate benchmarking.

	// Edit: It's possible that MTGS is that much faster than GS that it creates so much lag,
	// a game becomes uncontrollable (software rendering for example).
	// For that reason it's better to have the limit always in place, at the cost of a few max FPS in benchmarks.
	// If those are needed back, it's better to increase the VsyncQueueSize via PCSX_vm.ini.
	// (The Xenosaga engine is known to run into this, due to it throwing bulks of data in one frame followed by 2 empty frames.)

	if ((s_QueuedFrameCount.fetch_add(1) < EmuConfig.GS.VsyncQueueSize) /*|| (!EmuConfig.GS.VsyncEnable && !EmuConfig.GS.FrameLimitEnable)*/)
		return;

	s_VsyncSignalListener.store(true, std::memory_order_release);
	//Console.WriteLn( Color_Blue, "(EEcore Sleep) Vsync\t\tringpos=0x%06x, writepos=0x%06x", m_ReadPos.load(), m_WritePos.load() );

	s_sem_Vsync.Wait();
}

void MTGS::InitAndReadFIFO(u8* mem, u32 qwc)
{