mirror of
https://github.com/libretro/Mesen.git
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280 lines
7.0 KiB
C++
280 lines
7.0 KiB
C++
#pragma once
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#include "BaseMapper.h"
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#include "MMC5Audio.h"
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#include "Vrc6Audio.h"
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#include "FdsAudio.h"
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#include "Namco163Audio.h"
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#include "Sunsoft5bAudio.h"
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enum class NsfIrqType
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{
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Init = 0,
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Stop = 1,
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Play = 2,
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None = 0xFF
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};
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class NsfMapper : public BaseMapper
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{
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private:
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static NsfMapper *_instance;
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enum NsfSoundChips
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{
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VRC6 = 0x01,
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VRC7 = 0x02,
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FDS = 0x04,
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MMC5 = 0x08,
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Namco = 0x10,
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Sunsoft = 0x20
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};
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NsfHeader _nsfHeader;
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MMC5Audio _mmc5Audio;
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Vrc6Audio _vrc6Audio;
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FdsAudio _fdsAudio;
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Namco163Audio _namcoAudio;
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Sunsoft5bAudio _sunsoftAudio;
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bool _needInit = false;
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bool _irqEnabled = false;
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uint32_t _irqReloadValue = 0;
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uint32_t _irqCounter = 0;
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NsfIrqType _irqStatus = NsfIrqType::None;
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uint8_t _mmc5MultiplierValues[2];
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int32_t _trackEndCounter;
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int32_t _trackFadeCounter;
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int32_t _fadeLength;
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uint32_t _silenceDetectDelay;
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bool _trackEnded;
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bool _allowSilenceDetection;
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bool _hasBankSwitching;
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uint16_t _ntscSpeed;
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uint16_t _palSpeed;
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uint8_t _songNumber = 0;
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/*****************************************
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* NSF BIOS by Quietust, all credits to him!
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* Taken from the Nintendulator source code:
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* http://www.qmtpro.com/~nes/nintendulator/
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* See below for assembly source code
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******************************************/
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uint8_t _nsfBios[256] = {
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0xFF,0xFF,0xFF,0x78,0xA2,0xFF,0x8E,0x17,0x40,0xE8,0x20,0x30,0x3F,0x8E,0x00,0x20,
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0x8E,0x01,0x20,0x8E,0x12,0x3E,0x58,0x4C,0x17,0x3F,0x48,0x8A,0x48,0x98,0x48,0xAE,
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0x12,0x3E,0xF0,0x59,0xCA,0xF0,0xDC,0x20,0xF9,0x3F,0x68,0xA8,0x68,0xAA,0x68,0x40,
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0x8E,0x15,0x40,0xAD,0x13,0x3E,0x4A,0x90,0x09,0x8E,0x02,0x90,0x8E,0x02,0xA0,0x8E,
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0x02,0xB0,0x4A,0x90,0x0D,0xA0,0x20,0x8C,0x10,0x90,0x8E,0x30,0x90,0xC8,0xC0,0x26,
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0xD0,0xF5,0x4A,0x90,0x0B,0xA0,0x80,0x8C,0x83,0x40,0x8C,0x87,0x40,0x8C,0x89,0x40,
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0x4A,0x90,0x03,0x8E,0x15,0x50,0x4A,0x90,0x08,0xCA,0x8E,0x00,0xF8,0xE8,0x8E,0x00,
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0x48,0x4A,0x90,0x08,0xA0,0x07,0x8C,0x00,0xC0,0x8C,0x00,0xE0,0x60,0x20,0x30,0x3F,
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0x8A,0xCA,0x9A,0x8E,0xF7,0x5F,0xCA,0x8E,0xF6,0x5F,0xA2,0x7F,0x85,0x00,0x86,0x01,
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0xA8,0xA2,0x27,0x91,0x00,0xC8,0xD0,0xFB,0xCA,0x30,0x0A,0xC6,0x01,0xE0,0x07,0xD0,
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0xF2,0x86,0x01,0xF0,0xEE,0xA2,0x14,0xCA,0x9D,0x00,0x40,0xD0,0xFA,0xA2,0x07,0xBD,
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0x08,0x3E,0x9D,0xF8,0x5F,0xCA,0x10,0xF7,0xA0,0x0F,0x8C,0x15,0x40,0xAD,0x13,0x3E,
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0x29,0x04,0xF0,0x10,0xAD,0x0E,0x3E,0xF0,0x03,0x8D,0xF6,0x5F,0xAD,0x0F,0x3E,0xF0,
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0x03,0x8D,0xF7,0x5F,0xAE,0x11,0x3E,0xBD,0x04,0x3E,0x8D,0x10,0x3E,0xBD,0x06,0x3E,
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0x8D,0x11,0x3E,0x8C,0x12,0x3E,0xAD,0x12,0x3E,0x58,0xAD,0x10,0x3E,0x20,0xF6,0x3F,
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0x8D,0x13,0x3E,0x4C,0x17,0x3F,0x6C,0x00,0x3E,0x6C,0x02,0x3E,0x03,0x3F,0x1A,0x3F
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};
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private:
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void TriggerIrq(NsfIrqType type);
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void ClearIrq();
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bool HasBankSwitching();
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uint32_t GetClockRate();
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void InternalSelectTrack(uint8_t trackNumber, bool requestReset = true);
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void ClockLengthAndFadeCounters();
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protected:
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uint16_t GetPRGPageSize() { return 0x1000; }
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uint16_t GetCHRPageSize() { return 0x2000; }
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uint32_t GetWorkRamSize() { return 0x4000; }
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uint32_t GetWorkRamPageSize() { return 0x1000; }
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bool AllowRegisterRead() { return true; }
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void InitMapper();
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void InitMapper(RomData& romData);
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void Reset(bool softReset);
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void GetMemoryRanges(MemoryRanges &ranges);
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void ProcessCpuClock();
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uint8_t ReadRegister(uint16_t addr);
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void WriteRegister(uint16_t addr, uint8_t value);
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public:
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NsfMapper();
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~NsfMapper();
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static NsfMapper* GetInstance();
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void SelectTrack(uint8_t trackNumber);
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uint8_t GetCurrentTrack();
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NsfHeader GetNsfHeader();
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};
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/*
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;BIOS Source Code
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;NSF BIOS by Quietust, all credits to him!
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;Taken from the Nintendulator source code:
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;http://www.qmtpro.com/~nes/nintendulator/
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;NSF Mapper
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;R $3E00-$3E01 - INIT address
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;R $3E02-$3E03 - PLAY address
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;R $3E04/$3E06 - NTSC speed value
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;R $3E05/$3E07 - PAL speed value
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;R $3E08-$3E0F - Initial bankswitch values
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;R $3E10 - Song Number (start at 0)
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;R $3E11 - NTSC/PAL setting (0 for NTSC, 1 for PAL)
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;W $3E10-$3E11 - IRQ counter (for PLAY)
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;R $3E12 - IRQ status (0=INIT, 1=STOP, 2+=PLAY)
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;W $3E12 - IRQ enable (for PLAY)
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;R $3E13 - Sound chip info
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;W $3E13 - clear watchdog timer
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.org $3F00
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.db $FF,$FF,$FF ;pad to 256 bytes
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reset:SEI
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LDX #$FF
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STX $4017 ;kill frame IRQs
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INX
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JSR silence ;silence all sound channels
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STX $2000 ;we don't rely on the presence of a PPU
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STX $2001 ;but we don't want it getting in the way
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STX $3E12 ;kill PLAY timer
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CLI
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loop: JMP loop
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irq: PHA
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TXA
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PHA
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TYA
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PHA
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LDX $3E12 ;check IRQ status
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BEQ init
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DEX
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BEQ reset ;"Proper" way to play a tune
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JSR song_play ;1) Call the play address of the music at periodic intervals determined by the speed words.
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PLA
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TAY
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PLA
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TAX
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PLA
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RTI
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.module silence
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silence: ;X=0 coming in, must also be coming out
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STX $4015 ;silence all sound channels
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LDA $3E13
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LSR A
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BCC _1
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STX $9002
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STX $A002
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STX $B002 ;stop VRC6
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_1: LSR A
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BCC _2
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LDY #$20
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__2: STY $9010
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STX $9030 ;stop VRC7
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INY
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CPY #$26
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BNE __2
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_2: LSR A
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BCC _3
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LDY #$80
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STY $4083
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STY $4087
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STY $4089 ;stop FDS
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_3: LSR A
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BCC _4
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STX $5015 ;stop MMC5
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_4: LSR A
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BCC _5
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DEX
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STX $F800
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INX
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STX $4800 ;stop Namco-163
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_5: LSR A
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BCC _6
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LDY #$07
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STY $C000
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STY $E000 ;stop SUN5
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_6: RTS
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.module init ;"Proper" way to init a tune
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init: JSR silence
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TXA ;(X=0)
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DEX
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TXS ;clear the stack
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STX $5FF7 ;1.5) Map RAM to $6000-$7FFF
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DEX
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STX $5FF6 ;(banks FE/FF are treated as RAM)
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LDX #$7F
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STA $00
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STX $01
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TAY
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LDX #$27
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_1: STA ($00),Y ;1) Clear all RAM at $0000-$07FF.
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INY ;2) Clear all RAM at $6000-$7FFF.
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BNE _1
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DEX
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BMI _2
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DEC $01
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CPX #$07
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BNE _1
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STX $01
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BEQ _1
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_2: LDX #$14
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_3: DEX
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STA $4000,X ;3) Init the sound registers by writing $00 to $4000-$4013
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BNE _3
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LDX #$07
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_4: LDA $3E08,X ;5) If this is a banked tune, load the bank values from the header into $5FF8-$5FFF.
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STA $5FF8,X ;For this player, *all* tunes are considered banked (the loader will fill in appropriate values)
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DEX
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BPL _4
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LDY #$0F ;4) Set volume register $4015 to $0F.
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STY $4015
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LDA $3E13 ;For FDS games, banks E/F also get mapped to 6/7
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AND #$04 ;For non-FDS games, we don't want to do this
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BEQ _6
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LDA $3E0E ;if these are zero, let's leave them as plain RAM
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BEQ _5
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STA $5FF6
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_5: LDA $3E0F ;TODO - need to allow FDS NSF data to be writeable
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BEQ _6
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STA $5FF7
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_6: LDX $3E11 ;4.5) Set up the PLAY timer. Which word to use is determined by which mode you are in - PAL or NTSC.
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LDA $3E04,X ;X is 0 for NTSC and 1 for PAL, as needed for #6 below
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STA $3E10
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LDA $3E06,X
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STA $3E11
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STY $3E12
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LDA $3E12 ;if we have a pending IRQ here, we need to cancel it NOW
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CLI ;re-enable interrupts now - this way, we can allow the init routine to not return (ex: for raw PCM)
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LDA $3E10 ;6) Set the accumulator and X registers for the desired song.
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JSR song_init ;7) Call the music init routine.
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STA $3E13 ;kill the watchdog timer (and fire a 'Play' interrupt after 1 frame; otherwise, it'll wait 4 frames)
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JMP loop ;we don't actually RTI from here; this way, the init code is faster
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.module song
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song_init: JMP ($3E00)
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song_play: JMP ($3E02)
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.dw reset,irq ;no NMI vector
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.end
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*/
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