merge mapper code from FCEUX

[fceu.git] / boards / 3d-block.c

/* FCE Ultra - NES/Famicom Emulator\r
 *\r
 * Copyright notice for this file:\r
 *  Copyright (C) 2007 CaH4e3\r
 *\r
 * This program is free software; you can redistribute it and/or modify\r
 * it under the terms of the GNU General Public License as published by\r
 * the Free Software Foundation; either version 2 of the License, or\r
 * (at your option) any later version.\r
 *\r
 * This program is distributed in the hope that it will be useful,\r
 * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
 * GNU General Public License for more details.\r
 *\r
 * You should have received a copy of the GNU General Public License\r
 * along with this program; if not, write to the Free Software\r
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA\r
 */\r
\r
#include "mapinc.h"\r
\r
static uint8 reg[4], IRQa;\r
static int16 IRQCount, IRQPause;\r
\r
static int16 Count = 0x0000;\r
\r
static SFORMAT StateRegs[]=\r
{\r
  {reg, 4, "REGS"},\r
  {&IRQa, 1, "IRQA"},\r
  {&IRQCount, 2, "IRQC"},\r
  {0}\r
};\r
\r
static void Sync(void)\r
{\r
  setprg32(0x8000,0);\r
  setchr8(0);\r
}\r
\r
//#define Count 0x1800\r
#define Pause 0x010\r
\r
static DECLFW(UNL3DBlockWrite)\r
{\r
  switch(A)\r
  {\r
//4800 32\r
//4900 37\r
//4a00 01\r
//4e00 18\r
    case 0x4800: reg[0]=V; break;\r
    case 0x4900: reg[1]=V; break;\r
    case 0x4a00: reg[2]=V; break;\r
    case 0x4e00: reg[3]=V; IRQCount=Count; IRQPause=Pause; IRQa=1; X6502_IRQEnd(FCEU_IQEXT); break;\r
  } \r
}\r
\r
static void UNL3DBlockPower(void)\r
{\r
  Sync();\r
  SetReadHandler(0x8000,0xFFFF,CartBR);\r
  SetWriteHandler(0x4800,0x4E00,UNL3DBlockWrite);\r
}\r
\r
static void UNL3DBlockReset(void)\r
{\r
  Count+=0x10;\r
  FCEU_printf("Count=%04x\n",Count);\r
}\r
\r
static void UNL3DBlockIRQHook(int a)\r
{\r
  if(IRQa)\r
  {\r
    if(IRQCount>0)\r
    {\r
      IRQCount-=a;\r
    }\r
    else\r
    {\r
      if(IRQPause>0)\r
      {\r
        IRQPause-=a;\r
        X6502_IRQBegin(FCEU_IQEXT);\r
      }\r
      else\r
      {\r
        IRQCount=Count; \r
        IRQPause=Pause;\r
        X6502_IRQEnd(FCEU_IQEXT);\r
      }\r
    }\r
  }\r
}\r
\r
static void StateRestore(int version)\r
{\r
  Sync();\r
}\r
\r
void UNL3DBlock_Init(CartInfo *info)\r
{\r
  info->Power=UNL3DBlockPower;\r
  info->Reset=UNL3DBlockReset;\r
  MapIRQHook=UNL3DBlockIRQHook;\r
  GameStateRestore=StateRestore;\r
  AddExState(&StateRegs, ~0, 0, 0);\r
}\r