114 lines
3.2 KiB
C
114 lines
3.2 KiB
C
/* FCEUmm - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2025 NewRisingSun
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "mapinc.h"
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#include "mmc3.h"
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static uint8 submapper;
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static uint8 *CHRRAM =NULL;
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static uint32 CHRRAMSIZE;
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static void PRGWrap0(uint32 A, uint8 V) {
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int prgAND =EXPREGS[0] &0x20? 0x1F: 0x0F;
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setprg8(A, V &prgAND | EXPREGS[0] <<4 &~prgAND);
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}
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static void CHRWrap0(uint32 A, uint8 V) {
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int chrAND =EXPREGS[0] &0x20? 0xFF: 0x7F;
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setchr1(A, V &chrAND | EXPREGS[0] <<7 &~chrAND);
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}
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static void PRGWrap1(uint32 A, uint8 V) {
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int prgAND =(EXPREGS[0] &0x1F) ==0x1F? 0x1F: 0x0F;
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setprg8(A, V &prgAND | EXPREGS[0] <<4 &~prgAND);
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}
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static void CHRWrap1(uint32 A, uint8 V) {
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int chrAND =(EXPREGS[0] &0x1F) ==0x19? 0xFF: 0x7F;
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if (EXPREGS[0] &0x20)
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setchr8r(0x10, 0);
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else
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setchr1(A, V &chrAND | EXPREGS[0] <<7 &~chrAND);
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}
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static void PRGWrap2(uint32 A, uint8 V) {
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int prgAND =(EXPREGS[0] &0x0E) ==0x0E? 0x1F: 0x0F;
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if (EXPREGS[0] &0x20)
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setprg32(0x8000, EXPREGS[1] &3 | EXPREGS[0] <<2 &~3);
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else
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setprg8(A, V &prgAND | EXPREGS[0] <<4 &~prgAND);
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}
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static void CHRWrap2(uint32 A, uint8 V) {
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int chrAND =(EXPREGS[0] &0x0F) ==0x03 || (EXPREGS[0] &0x0F) ==0x0F? 0xFF: 0x7F;
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if (EXPREGS[0] &0x10) {
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setchr2(0x0000, DRegBuf[0] &0xFE | 0x400);
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setchr2(0x0800, DRegBuf[1] |0x01 | 0x400);
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setchr2(0x1000, DRegBuf[2] | 0x400);
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setchr2(0x1800, DRegBuf[5] | 0x400);
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} else
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setchr1(A, V &chrAND | EXPREGS[0] <<7 &~chrAND);
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}
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static DECLFW(WriteReg) {
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if (submapper ==2 && EXPREGS[0] &0x30)
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EXPREGS[1] =A &0x100? (A >>4): (V <<1 &2 | V >>4 &1);
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else
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EXPREGS[0] =A &0xFF;
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FixMMC3PRG(MMC3_cmd);
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FixMMC3CHR(MMC3_cmd);
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}
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static void Power(void) {
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EXPREGS[0] =0;
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EXPREGS[1] =3;
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GenMMC3Power();
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SetWriteHandler(0x6000, 0x7FFF, WriteReg);
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}
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static void Reset(void) {
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EXPREGS[0] =0;
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EXPREGS[1] =3;
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MMC3RegReset();
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}
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static void Close(void) {
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if (CHRRAM)
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FCEU_gfree(CHRRAM);
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CHRRAM =NULL;
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}
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void Mapper480_Init(CartInfo *info) {
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submapper =info->submapper;
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GenMMC3_Init(info, 256, 256, info->iNES2? (info->PRGRamSize + info->PRGRamSaveSize) /1024: 8, info->battery);
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pwrap = submapper ==2? PRGWrap2: submapper==1? PRGWrap1: PRGWrap0;
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cwrap = submapper ==2? CHRWrap2: submapper==1? CHRWrap1: CHRWrap0;
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info->Power = Power;
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info->Reset = Reset;
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info->Close = Close;
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AddExState(EXPREGS, 2, 0, "EXPR");
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if (submapper ==1) {
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CHRRAMSIZE = 8192;
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CHRRAM = (uint8*)FCEU_gmalloc(CHRRAMSIZE);
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SetupCartCHRMapping(0x10, CHRRAM, CHRRAMSIZE, 1);
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AddExState(CHRRAM, CHRRAMSIZE, 0, "CHRR");
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}
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}
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