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Rewrote the VRC2/4 emulation for modularity, and separate individual mappers into separate source files.

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NewRisingSun
2025-04-07 21:33:51 +02:00
committed by LibretroAdmin
parent b349f7f3e2
commit 6cbb11bdd1
8 changed files with 907 additions and 343 deletions
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src/boards/308.c Normal file
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/* FCE Ultra - NES/Famicom Emulator
*
* Copyright notice for this file:
* Copyright (C) 2025 NewRisingSun
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "mapinc.h"
#include "vrc2and4.h"
static uint8 irqEnabled;
static uint16 irqCounterLow;
static uint8 irqCounterHigh;
static SFORMAT UNLTH21311_stateRegs[] ={
{ &irqEnabled, 1, "IRQE" },
{ &irqCounterLow, 2 | FCEUSTATE_RLSB, "CNTL" },
{ &irqCounterHigh, 1, "CNTH" },
{ 0 }
};
static void sync () {
VRC24_syncPRG(0x01F, 0x000);
VRC24_syncCHR(0x1FF, 0x000);
VRC24_syncMirror();
}
DECLFW(UNLTH21311_writeIRQ) {
switch(A &3) {
case 0: X6502_IRQEnd(FCEU_IQEXT);
irqEnabled =0;
irqCounterLow =0;
break;
case 1: irqEnabled =1;
break;
case 3: irqCounterHigh =V >>4;
break;
}
}
void FP_FASTAPASS(1) UNLTH21311_cpuCycle(int a) {
while (a--) if (irqEnabled) {
if ((++irqCounterLow &4095) ==2048) irqCounterHigh--;
if (!irqCounterHigh && (irqCounterLow &4095) <2048) X6502_IRQBegin(FCEU_IQEXT);
}
}
void UNLTH21311_power(void) {
irqEnabled =irqCounterLow =irqCounterHigh =0;
VRC24_power();
SetWriteHandler(0xF000, 0xFFFF, UNLTH21311_writeIRQ);
}
void UNLTH21311_Init (CartInfo *info) {
VRC24_init(info, sync, 0x01, 0x02, 0, 0, 0);
AddExState(UNLTH21311_stateRegs, ~0, 0, 0);
info->Power =UNLTH21311_power;
MapIRQHook =UNLTH21311_cpuCycle;
}