Function gifMFIFOInterrupt

pcsx2/Gif.cpp:693–787

}

void gifMFIFOInterrupt()
{
	//DevCon.Warning("gifMFIFOInterrupt");
	gif.mfifocycles = 0;

	if (dmacRegs.ctrl.MFD != MFD_GIF)
	{ // GIF not in MFIFO anymore, come out.
		DevCon.WriteLn("GIF Leaving MFIFO - Report if any errors");
		gifInterrupt();
		CPU_SET_DMASTALL(DMAC_MFIFO_GIF, true);
		return;
	}

	gifCheckPathStatus(false);

	if (gifUnit.gifPath[GIF_PATH_3].state == GIF_PATH_IDLE)
	{
		if (vif1Regs.stat.VGW)
		{
			// Check if VIF is in a cycle or is currently "idle" waiting for GIF to come back.
			if (!(cpuRegs.interrupt & (1 << DMAC_VIF1)))
				CPU_INT(DMAC_VIF1, 1);

			// Make sure it loops if the GIF packet is empty to prepare for the next packet
			// or end if it was the end of a packet.
			// This must trigger after VIF retriggers as VIf might instantly mask Path3
			if (!gifUnit.Path3Masked() || gifch.qwc == 0)
			{
				GifDMAInt(16);
			}
			CPU_SET_DMASTALL(DMAC_MFIFO_GIF, gifUnit.Path3Masked() || !gifUnit.CanDoPath3());
			return;
		}
	}

	if (gifUnit.gsSIGNAL.queued)
	{
		GifDMAInt(128);
		CPU_SET_DMASTALL(DMAC_MFIFO_GIF, true);
		return;
	}

	// If there's something in the FIFO and we can do PATH3, empty the FIFO.
	if (gif_fifo.fifoSize > 0)
	{
		const int readSize = gif_fifo.read_fifo();

		if (readSize)
			GifDMAInt(readSize * BIAS);

		// The following is quite timing sensitive so we need to pause/resume the DMA in these certain scenarios
		// If the DMA is masked/blocked and the fifo is full, no need to run the DMA
		// If we just read from the fifo, we want to loop and not read more DMA
		// If there is no DMA data waiting and the DMA is active, let the DMA progress until there is
		if ((!CheckPaths() && gif_fifo.fifoSize == 16) || readSize)
		{
			CPU_SET_DMASTALL(DMAC_MFIFO_GIF, gifUnit.Path3Masked() || !gifUnit.CanDoPath3());
			return;