From 2c2fe14903e81c426f850c6bb4a687e2fb4d2077 Mon Sep 17 00:00:00 2001
From: dinkc64 <12570148+dinkc64@users.noreply.github.com>
Date: Mon, 28 May 2018 04:13:25 +0000
Subject: [PATCH] ddragon: run at the right speed + carry over cycles for
 better netgame + inputs recording sync

---
 src/burn/drv/pre90s/d_ddragon.cpp | 28 ++++++++++++++++++----------
 1 file changed, 18 insertions(+), 10 deletions(-)

diff --git a/src/burn/drv/pre90s/d_ddragon.cpp b/src/burn/drv/pre90s/d_ddragon.cpp
index d88e83bc1..0e9626d8e 100644
--- a/src/burn/drv/pre90s/d_ddragon.cpp
+++ b/src/burn/drv/pre90s/d_ddragon.cpp
@@ -59,8 +59,9 @@ static UINT16 DrvScrollYHi;
 static UINT8  DrvScrollXLo;
 static UINT8  DrvScrollYLo;
 
-static INT32 nCyclesDone[4], nCyclesTotal[4];
+static INT32 nCyclesTotal[4];
 static INT32 nCyclesSegment;
+static INT32 nExtraCycles[4];
 
 #define DD_CPU_TYPE_NONE		0
 #define DD_CPU_TYPE_HD63701		1
@@ -1047,6 +1048,8 @@ static INT32 DrvDoReset()
 	DrvLastSubPort = 0;
 	DrvLast3808Data = 0;
 
+	nExtraCycles[0] = nExtraCycles[1] = nExtraCycles[2] = nExtraCycles[3] = 0;
+
 	return 0;
 }
 
@@ -2068,8 +2071,8 @@ static INT32 DrvMachineInit()
 		m6805SetWriteHandler(DrvMCUWriteByte);
 	}
 
-	nCyclesTotal[0] = (INT32)((double)4000000 / 57.44853);
-	nCyclesTotal[1] = (INT32)((double)4000000 / 57.44853);
+	nCyclesTotal[0] = (INT32)((double)3000000 / 57.44853);
+	nCyclesTotal[1] = (INT32)((double)1500000 / 57.44853);
 	nCyclesTotal[2] = (INT32)((double)1500000 / 57.44853);
 
 	GenericTilesInit();
@@ -2127,7 +2130,7 @@ static INT32 Drv2MachineInit()
 
 	BurnSetRefreshRate(57.444853);
 
-	nCyclesTotal[0] = (INT32)((double)4000000 / 57.44853);
+	nCyclesTotal[0] = (INT32)((double)3000000 / 57.44853);
 	nCyclesTotal[1] = (INT32)((double)4000000 / 57.44853);
 	nCyclesTotal[2] = (INT32)((double)3579545 / 57.44853);
 	nCyclesTotal[3] = (INT32)((double)4000000 / 57.44853); // darktower
@@ -2161,8 +2164,6 @@ static INT32 DrvbInit()
 	if (DrvLoadRoms()) return 1;
 	if (DrvMachineInit()) return 1;
 
-	nCyclesTotal[1] = (INT32)((double)1500000 / 57.44853);
-
 	return 0;
 }
 
@@ -2516,11 +2517,11 @@ static INT32 DrvFrame()
 
 	DrvMakeInputs();
 
-	UINT32 nCyclesToDo[2];
-	nCyclesToDo[0] = (INT32)((double)nCyclesTotal[0] * nBurnCPUSpeedAdjust / 0x0100);
-	nCyclesToDo[1] = (INT32)((double)nCyclesTotal[1] * nBurnCPUSpeedAdjust / 0x0100);
+	INT32 nCyclesToDo[2] = {
+		(INT32)((double)nCyclesTotal[0] * nBurnCPUSpeedAdjust / 0x0100),
+		(INT32)((double)nCyclesTotal[1] * nBurnCPUSpeedAdjust / 0x0100) };
 
-	nCyclesDone[0] = nCyclesDone[1] = nCyclesDone[2] = nCyclesDone[3] = 0;
+	INT32 nCyclesDone[4] = { nExtraCycles[0], nExtraCycles[1], nExtraCycles[2], nExtraCycles[3] };
 
 	HD6309NewFrame();
 	if (DrvSubCPUType == DD_CPU_TYPE_HD63701) HD63701NewFrame();
@@ -2669,6 +2670,11 @@ static INT32 DrvFrame()
 		}
 	}
 
+	nExtraCycles[0] = nCyclesDone[0] - nCyclesTotal[0];
+	nExtraCycles[1] = nCyclesDone[1] - nCyclesTotal[1];
+	nExtraCycles[2] = nCyclesDone[2] - nCyclesTotal[2];
+	nExtraCycles[3] = nCyclesDone[3] - nCyclesTotal[3];
+
 	if (pBurnDraw) DrvDraw();
 
 	return 0;
@@ -2718,6 +2724,8 @@ static INT32 DrvScan(INT32 nAction, INT32 *pnMin)
 		SCAN_VAR(DrvLastSubPort);
 		SCAN_VAR(DrvLast3808Data);
 
+		SCAN_VAR(nExtraCycles);
+
 		if (nAction & ACB_WRITE) {
 			HD6309Open(0);
 			HD6309MapMemory(DrvHD6309Rom + 0x8000 + (DrvRomBank * 0x4000), 0x4000, 0x7fff, MAP_ROM);