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player/Project/Src/NES/mapper/Mapper001.h
andy 079aa9f868 ת»»Ϊgb2312±àÂë
2025-07-05 19:47:28 +08:00

341 lines
10 KiB
C
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#ifndef _MAPPER001_H_
#define _MAPPER001_H_
#include "nes_mapper.h"
Mapper1Res *MAP1;
void Map1_set_ROM_banks(void);
void Mapper001_Reset()
{
uint32 size_in_K;
MAP1->Map1_Cnt = 0;
MAP1->Map1_Latch = 0x00;
MAP1->Map1_Regs[ 0 ] = 0x0c;
MAP1->Map1_Regs[ 1 ] = 0x00;
MAP1->Map1_Regs[ 2 ] = 0x00;
MAP1->Map1_Regs[ 3 ] = 0x00;
size_in_K = ( RomHeader->num_16k_rom_banks << 1 ) * 8;//16kB ROM的数目
if ( size_in_K == 1024 )
{
MAP1->Map1_Size = Map1_1024K;
}
else if(size_in_K == 512)
{
MAP1->Map1_Size = Map1_512K;
}
else
{
MAP1->Map1_Size = Map1_SMALL;
}
MAP1->Map1_256K_base = 0; // use first 256K使用第一个256 k
MAP1->Map1_swap = 0;
if( MAP1->Map1_Size == Map1_SMALL )
{
// set two high pages to last two banks两个高的页面设置为最后
MAP1->Map1_HI1 = ( RomHeader->num_16k_rom_banks << 1 ) - 2;
MAP1->Map1_HI2 = ( RomHeader->num_16k_rom_banks << 1 ) - 1;
}
else
{
// set two high pages to last two banks of current 256K region
MAP1->Map1_HI1 = ( 256 / 8 ) - 2;
MAP1->Map1_HI2 = ( 256 / 8 ) - 1;
}
// set CPU bank pointers
MAP1->Map1_bank1 = 0;
MAP1->Map1_bank2 = 1;
MAP1->Map1_bank3 = MAP1->Map1_HI1;
MAP1->Map1_bank4 = MAP1->Map1_HI2;
/* Set ROM Banks */
Map1_set_ROM_banks();//************************************************************
}
void Map1_set_ROM_banks(void)
{
// ROMBANK0 = ROMPAGE( ( (MAP1->Map1_256K_base << 5) + (MAP1->Map1_bank1 & ((256/8)-1)) ) % ( Neshd->byRomSize << 1 ) );
// ROMBANK1 = ROMPAGE( ( (MAP1->Map1_256K_base << 5) + (MAP1->Map1_bank2 & ((256/8)-1)) ) % ( Neshd->byRomSize << 1 ) );
// ROMBANK2 = ROMPAGE( ( (MAP1->Map1_256K_base << 5) + (MAP1->Map1_bank3 & ((256/8)-1)) ) % ( Neshd->byRomSize << 1 ) );
// ROMBANK3 = ROMPAGE( ( (MAP1->Map1_256K_base << 5) + (MAP1->Map1_bank4 & ((256/8)-1)) ) % ( Neshd->byRomSize << 1 ) );
//******************************************************************************************************
// set_CPU_banks((MMC1_256K_base << 5) + (MMC1_bank1 & ((256/8)-1)),
// (MMC1_256K_base << 5) + (MMC1_bank2 & ((256/8)-1)),
// (MMC1_256K_base << 5) + (MMC1_bank3 & ((256/8)-1)),
// (MMC1_256K_base << 5) + (MMC1_bank4 & ((256/8)-1)));
set_cpu_bank0(( (MAP1->Map1_256K_base << 5) + (MAP1->Map1_bank1 & ((256/8)-1))) );
set_cpu_bank1(( (MAP1->Map1_256K_base << 5) + (MAP1->Map1_bank2 & ((256/8)-1))) );
set_cpu_bank2(( (MAP1->Map1_256K_base << 5) + (MAP1->Map1_bank3 & ((256/8)-1))) );
set_cpu_bank3(( (MAP1->Map1_256K_base << 5) + (MAP1->Map1_bank4 & ((256/8)-1))) );
}
void Mapper001_Write( uint8 byData, uint16 wAddr)//VROM_1K_SIZE
{
uint32 dwRegNum;
// if write is to a different reg, reset
if( ( wAddr & 0x6000 ) != ( MAP1->Map1_Last_Write_Addr & 0x6000 ) )
{
MAP1->Map1_Cnt = 0;
MAP1->Map1_Latch = 0x00;
}
MAP1->Map1_Last_Write_Addr = wAddr;
// if bit 7 set, reset and return
if ( byData & 0x80 )
{
MAP1->Map1_Cnt = 0;
MAP1->Map1_Latch = 0x00;
return;
}
if ( byData & 0x01 ) MAP1->Map1_Latch |= ( 1 << MAP1->Map1_Cnt );
MAP1->Map1_Cnt++;
if( MAP1->Map1_Cnt < 5 ) return;
dwRegNum = ( wAddr & 0x7FFF ) >> 13;
MAP1->Map1_Regs[ dwRegNum ] = MAP1->Map1_Latch;
MAP1->Map1_Cnt = 0;
MAP1->Map1_Latch = 0x00;
switch( dwRegNum )
{
case 0:
{
// set mirroring
if( MAP1->Map1_Regs[0] & 0x02 )
{
if( MAP1->Map1_Regs[0] & 0x01 )
{
PPU_set_mirroring(0,0,1,1);//水平镜像InfoNES_Mirroring( 0 ); //0011
}
else
{
PPU_set_mirroring(0,1,0,1);//垂直镜像InfoNES_Mirroring( 1 ); //0101
}
}
else
{
// one-screen mirroring
if( MAP1->Map1_Regs[0] & 0x01 )
{
PPU_set_mirroring(1,1,1,1);//InfoNES_Mirroring( 2 ); //1111
}
else
{
PPU_set_mirroring(0,0,0,0);//InfoNES_Mirroring( 3 ); //0000
}
}
}
break;
case 1:
{
uint8 byBankNum = MAP1->Map1_Regs[1];
if ( MAP1->Map1_Size == Map1_1024K )
{
if ( MAP1->Map1_Regs[0] & 0x10 )
{
if ( MAP1->Map1_swap )
{
MAP1->Map1_256K_base = (MAP1->Map1_Regs[1] & 0x10) >> 4;
if(MAP1->Map1_Regs[0] & 0x08)
{
MAP1->Map1_256K_base |= ((MAP1->Map1_Regs[2] & 0x10) >> 3);
}
Map1_set_ROM_banks();//**********************************
MAP1->Map1_swap = 0;
}
else
{
MAP1->Map1_swap = 1;
}
}
else
{
// use 1st or 4th 256K banks
MAP1->Map1_256K_base = ( MAP1->Map1_Regs[1] & 0x10 ) ? 3 : 0;
Map1_set_ROM_banks();
}
}
else if((MAP1->Map1_Size == Map1_512K) && (!RomHeader->num_8k_vrom_banks))
{
MAP1->Map1_256K_base = (MAP1->Map1_Regs[1] & 0x10) >> 4;
Map1_set_ROM_banks();
}
else if ( RomHeader->num_8k_vrom_banks )
{
// set VROM bank at $0000
if ( MAP1->Map1_Regs[0] & 0x10 )
{
// swap 4K
byBankNum <<= 2;
// PPUBANK[ 0 ] = VROMPAGE( (byBankNum+0) % (Neshd->byVRomSize << 3) );
// PPUBANK[ 1 ] = VROMPAGE( (byBankNum+1) % (Neshd->byVRomSize << 3) );
// PPUBANK[ 2 ] = VROMPAGE( (byBankNum+2) % (Neshd->byVRomSize << 3) );
// PPUBANK[ 3 ] = VROMPAGE( (byBankNum+3) % (Neshd->byVRomSize << 3) );
// InfoNES_SetupChr();
//*********************************************************************************
set_PPU_bank0(byBankNum+0);
set_PPU_bank1(byBankNum+1);
set_PPU_bank2(byBankNum+2);
set_PPU_bank3(byBankNum+3);
}
else
{
// swap 8K
byBankNum <<= 2;
// PPUBANK[ 0 ] = VROMPAGE( (byBankNum+0) % (Neshd->byVRomSize << 3) );
// PPUBANK[ 1 ] = VROMPAGE( (byBankNum+1) % (Neshd->byVRomSize << 3) );
// PPUBANK[ 2 ] = VROMPAGE( (byBankNum+2) % (Neshd->byVRomSize << 3) );
// PPUBANK[ 3 ] = VROMPAGE( (byBankNum+3) % (Neshd->byVRomSize << 3) );
// PPUBANK[ 4 ] = VROMPAGE( (byBankNum+4) % (Neshd->byVRomSize << 3) );
// PPUBANK[ 5 ] = VROMPAGE( (byBankNum+5) % (Neshd->byVRomSize << 3) );
// PPUBANK[ 6 ] = VROMPAGE( (byBankNum+6) % (Neshd->byVRomSize << 3) );
// PPUBANK[ 7 ] = VROMPAGE( (byBankNum+7) % (Neshd->byVRomSize << 3) );
// InfoNES_SetupChr();
//******************************************************************************************
// swap 8K
set_PPU_banks(byBankNum+0,byBankNum+1,byBankNum+2,byBankNum+3,
byBankNum+4,byBankNum+5,byBankNum+6,byBankNum+7);
}
}
}
break;
case 2:
{
uint8 byBankNum = MAP1->Map1_Regs[2];
if((MAP1->Map1_Size == Map1_1024K) && (MAP1->Map1_Regs[0] & 0x08))
{
if(MAP1->Map1_swap)
{
MAP1->Map1_256K_base = (MAP1->Map1_Regs[1] & 0x10) >> 4;
MAP1->Map1_256K_base |= ((MAP1->Map1_Regs[2] & 0x10) >> 3);
Map1_set_ROM_banks();
MAP1->Map1_swap = 0;
}
else
{
MAP1->Map1_swap = 1;
}
}
if(!RomHeader->num_8k_vrom_banks)
{
if ( MAP1->Map1_Regs[ 0 ] & 0x10 )
{
byBankNum <<= 2;
// PPUBANK[ 4 ] = CRAMPAGE( byBankNum+0 );
// PPUBANK[ 5 ] = CRAMPAGE( byBankNum+1 );
// PPUBANK[ 6 ] = CRAMPAGE( byBankNum+2 );
// PPUBANK[ 7 ] = CRAMPAGE( byBankNum+3 );
// InfoNES_SetupChr();
//************************************************************
set_VRAM_bank(4, byBankNum+0);
set_VRAM_bank(5, byBankNum+1);
set_VRAM_bank(6, byBankNum+2);
set_VRAM_bank(7, byBankNum+3);
break;
}
}
// set 4K VROM bank at $1000
if(MAP1->Map1_Regs[0] & 0x10)
{
// swap 4K
byBankNum <<= 2;
// PPUBANK[ 4 ] = VROMPAGE( (byBankNum+0) % (Neshd->byVRomSize << 3) );
// PPUBANK[ 5 ] = VROMPAGE( (byBankNum+1) % (Neshd->byVRomSize << 3) );
// PPUBANK[ 6 ] = VROMPAGE( (byBankNum+2) % (Neshd->byVRomSize << 3) );
// PPUBANK[ 7 ] = VROMPAGE( (byBankNum+3) % (Neshd->byVRomSize << 3) );
// InfoNES_SetupChr();
//**************************************************************************************
// swap 4K
set_PPU_bank4(byBankNum+0);
set_PPU_bank5(byBankNum+1);
set_PPU_bank6(byBankNum+2);
set_PPU_bank7(byBankNum+3);
}
}
break;
case 3:
{
uint8 byBankNum = MAP1->Map1_Regs[3];
// set ROM bank
if ( MAP1->Map1_Regs[0] & 0x08 )
{
// 16K of ROM
byBankNum <<= 1;
if ( MAP1->Map1_Regs[0] & 0x04 )
{
// 16K of ROM at $8000
MAP1->Map1_bank1 = byBankNum;
MAP1->Map1_bank2 = byBankNum+1;
MAP1->Map1_bank3 = MAP1->Map1_HI1;
MAP1->Map1_bank4 = MAP1->Map1_HI2;
}
else
{
// 16K of ROM at $C000
if(MAP1->Map1_Size == Map1_SMALL)
{
MAP1->Map1_bank1 = 0;
MAP1->Map1_bank2 = 1;
MAP1->Map1_bank3 = byBankNum;
MAP1->Map1_bank4 = byBankNum+1;
}
}
}
else
{
// 32K of ROM at $8000
byBankNum <<= 1;
MAP1->Map1_bank1 = byBankNum;
MAP1->Map1_bank2 = byBankNum+1;
if(MAP1->Map1_Size == Map1_SMALL)
{
MAP1->Map1_bank3 = byBankNum+2;
MAP1->Map1_bank4 = byBankNum+3;
}
}
Map1_set_ROM_banks();//*********************************************
}
break;
}
}
void Mapper001_Init()
{
NES_Mapper->Reset = Mapper001_Reset;
NES_Mapper->Write = Mapper001_Write;
}
#endif
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