Integrated Snes9x OBC1 code. Metal Combat doesn't have any graphical problems anymore. Special thanks to Nach for assistance in fixing several bugs.

2006-03-26 19:01:17 +00:00
parent 6198c10f8b
commit 692a24520d
9 changed files with 244 additions and 213 deletions
--- a/zsnes/src/chips/obc1emu.c
+++ b/zsnes/src/chips/obc1emu.c
@@ -0,0 +1,141 @@
+/*
+Copyright (C) 1997-2006 ZSNES Team ( zsKnight, _Demo_, pagefault, Nach )
+
+http://www.zsnes.com
+http://sourceforge.net/projects/zsnes
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+version 2 as published by the Free Software Foundation.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+typedef unsigned char bool8;
+typedef unsigned char uint8;
+typedef unsigned short uint16;
+typedef unsigned int uint32;
+typedef char int8;
+typedef short int16;
+typedef long int32;
+
+//C++ in C
+typedef unsigned char bool;
+#define true 1
+#define false 0
+
+static uint8 *OBC1_RAM = 0;
+
+int OBC1_Address;
+int OBC1_BasePtr;
+int OBC1_Shift;
+
+uint16 obc1_address;
+uint8 obc1_byte;
+
+void GetOBC1 ()
+{
+	switch(obc1_address) {
+		case 0x7ff0:
+			obc1_byte = OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2)];
+
+		case 0x7ff1:
+			obc1_byte = OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 1];
+
+		case 0x7ff2:
+			obc1_byte = OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 2];
+
+		case 0x7ff3:
+			obc1_byte = OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 3];
+
+		case 0x7ff4:
+			obc1_byte = OBC1_RAM[OBC1_BasePtr + (OBC1_Address >> 2) + 0x200];
+
+		default:
+			obc1_byte = OBC1_RAM[obc1_address & 0x1fff];
+	}
+}
+
+
+void SetOBC1 ()
+{
+	switch(obc1_address) {
+		case 0x7ff0:
+		{
+			OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2)] = obc1_byte;
+			break;
+		}
+
+		case 0x7ff1:
+		{
+			OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 1] = obc1_byte;
+			break;
+		}
+
+		case 0x7ff2:
+		{
+			OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 2] = obc1_byte;
+			break;
+		}
+
+		case 0x7ff3:
+		{
+			OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 3] = obc1_byte;
+			break;
+		}
+
+		case 0x7ff4:
+		{
+			unsigned char Temp;
+
+			Temp = OBC1_RAM[OBC1_BasePtr + (OBC1_Address >> 2) + 0x200];
+			Temp = (Temp & ~(3 << OBC1_Shift)) | ((obc1_byte & 3) << OBC1_Shift);
+			OBC1_RAM[OBC1_BasePtr + (OBC1_Address >> 2) + 0x200] = Temp;
+			break;
+		}
+
+		case 0x7ff5:
+		{
+			if (obc1_byte & 1)
+				OBC1_BasePtr = 0x1800;
+			else
+				OBC1_BasePtr = 0x1c00;
+
+			break;
+		}
+
+		case 0x7ff6:
+		{
+			OBC1_Address = obc1_byte & 0x7f;
+			OBC1_Shift = (obc1_byte & 3) << 1;
+			break;
+		}
+	}
+
+	OBC1_RAM[obc1_address & 0x1fff] = obc1_byte;
+}
+
+void ResetOBC1()
+{
+	if (OBC1_RAM[0x1ff5] & 1)
+		OBC1_BasePtr = 0x1800;
+	else
+		OBC1_BasePtr = 0x1c00;
+
+	OBC1_Address = OBC1_RAM[0x1ff6] & 0x7f;
+	OBC1_Shift = (OBC1_RAM[0x1ff6] & 3) << 1;
+}
+
+extern unsigned char *romdata;
+void InitOBC()
+{
+  OBC1_RAM = romdata+0x400000;
+  ResetOBC1();
+}