Vif: Modified VIF FIFO reverse while VIF is active hack. Now just makes sure VIF is stopped before it swaps direction either way. Fixes Sled Storm.

git-svn-id: http://pcsx2.googlecode.com/svn/trunk@5477 96395faa-99c1-11dd-bbfe-3dabce05a288

pcsx2/Vif.cpp

@@ -272,13 +272,17 @@ __fi void vif1STAT(u32 value) {
 	if ((vif1Regs.stat.FDR) ^ ((tVIF_STAT&)value).FDR) {
 		// different so can't be stalled
 		if (vif1Regs.stat.test(VIF1_STAT_INT | VIF1_STAT_VSS | VIF1_STAT_VIS | VIF1_STAT_VFS)) {
-			DevCon.WriteLn("changing dir when vif1 fifo stalled done = %x qwc = %x", vif1.done, vif1ch.qwc);
-
-			//Hack!! Hotwheels seems to leave 1QW in the fifo and expect the DMA to be ready for a reverse FIFO
-			//There's no important data in there so for it to work, we will just end it.
-			vif1ch.chcr.STR = false;
-			//This is actually more important for our handling, else the DMA for reverse fifo doesnt start properly.
+			DevCon.WriteLn("changing dir when vif1 fifo stalled done = %x qwc = %x", vif1.done, vif1ch.qwc);		
 		}
+
+		//Hack!! Hotwheels seems to leave 1QW in the fifo and expect the DMA to be ready for a reverse FIFO
+		//There's no important data in there so for it to work, we will just end it.
+		//Hotwheels had this in the "direction when stalled" area, however Sled Storm seems to keep an eye on the dma
+		//position, as we clear it and set it to the end well before the interrupt, the game assumes it's finished,
+		//then proceeds to reverse the dma before we have even done it ourselves. So lets just make sure VIF is ready :)
+		vif1ch.chcr.STR = false;
+		cpuRegs.interrupt &= ~((1 << DMAC_VIF1) | (1 << DMAC_MFIFO_VIF));
+		//This is actually more important for our handling, else the DMA for reverse fifo doesnt start properly.
 	}
 
 	vif1Regs.stat.FDR = VIF_STAT(value).FDR;