Function gifInterrupt

pcsx2/Gif.cpp:214–301

}

__fi void gifInterrupt()
{
	GIF_LOG("gifInterrupt caught qwc=%d fifo=%d(%d) apath=%d oph=%d state=%d!", gifch.qwc, gifRegs.stat.FQC, gif_fifo.fifoSize, gifRegs.stat.APATH, gifRegs.stat.OPH, gifUnit.gifPath[GIF_PATH_3].state);
	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_GIF, gifUnit.Path3Masked() || !gifUnit.CanDoPath3());
			return;
		}
	}

	if (dmacRegs.ctrl.MFD == MFD_GIF)
	{ // GIF MFIFO
		//Console.WriteLn("GIF MFIFO");
		gifMFIFOInterrupt();
		return;
	}

	if (gifUnit.gsSIGNAL.queued)
	{
		GIF_LOG("Path 3 Paused");
		GifDMAInt(128);
		CPU_SET_DMASTALL(DMAC_GIF, true);
		if (gif_fifo.fifoSize == 16)
			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_GIF, gifUnit.Path3Masked() || !gifUnit.CanDoPath3());
			return;
		}