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public release of panzgb

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panzone
2025-11-24 13:37:49 +01:00
commit d08fbfe1aa
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lib/gb-impl.h Executable file
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#ifndef GB_IMPL_H
#define GB_IMPL_H
#include "panzgb.h"
#define NAME_CART 0x134
#define CARTRIDGE_SIZE 0x200000
#define MEMORY_SIZE 0x10000
#define KEYMAP_ADDR 0xFF00
#define DIVIDER_TIMER 0xFF04
#define TIMER_ADDR 0xFF05
#define TIMER_DEFAULT 0xFF06
#define TIMER_CONTROLLER 0xFF07
#define INTERRUPT_ENABLED_ADDR 0xFFFF
#define INTERRUPT_REQUEST_ADDR 0xFF0F
#define LCD_SCANLINE_ADRR 0xFF44
#define LCD_REG_CONTROL 0xFF40
#define LCD_REG_STATUS 0xFF41
#define DMA_ADRR 0xFF46
#define SCROLLX 0xFF43
#define SCROLLY 0xFF42
#define WINDOWY 0xFF4A
#define WINDOWX 0xFF4B
#define getAF(cpu) ((cpu->A << 8) | (cpu->F))
#define getBC(cpu) ((cpu->B << 8) | (cpu->C))
#define getDE(cpu) ((cpu->D << 8) | (cpu->E))
#define getHL(cpu) ((cpu->H << 8) | (cpu->L))
#define SET_ZFLAG(cpu) (cpu->F |= 0x80)
#define SET_NFLAG(cpu) (cpu->F |= 0x40)
#define SET_HFLAG(cpu) (cpu->F |= 0x20)
#define SET_CFLAG(cpu) (cpu->F |= 0x10)
#define RESET_ZFLAG(cpu) (cpu->F &= ~(0x80))
#define RESET_NFLAG(cpu) (cpu->F &= ~(0x40))
#define RESET_HFLAG(cpu) (cpu->F &= ~(0x20))
#define RESET_CFLAG(cpu) (cpu->F &= ~(0x10))
#define PUSH(cpu, base, l) \
do { \
writeMemory(cpu, base - 2, l & 0xFF); \
writeMemory(cpu, base - 1, (l >> 8) & 0xFF); \
base -= 2; \
} while (0);
#define POP(cpu, base, l) \
do { \
BYTE _low = readMemory(cpu, base); \
l = (readMemory(cpu, base + 1) << 8) | _low; \
base += 2; \
} while (0);
#define GET_BYTE_PC(cpu, l) \
do { \
l = readMemory(cpu, cpu->progCounter); \
cpu->progCounter++; \
} while (0);
#define GET_WORD_PC(cpu, l) \
do { \
l = readMemory(cpu, cpu->progCounter); \
cpu->progCounter++; \
BYTE _hi = readMemory(cpu, cpu->progCounter); \
cpu->progCounter++; \
l = (_hi << 8) | l; \
} while (0);
struct audio_channel {
int pos;
int period_clock;
int length_timer;
int env_vol;
int env_dir;
int env_sweep_pace;
};
struct gameboy {
BYTE cartridge[CARTRIDGE_SIZE];
BYTE memory[MEMORY_SIZE];
// Now the CPU registers
WORD progCounter;
WORD stack;
BYTE A;
BYTE B;
BYTE C;
BYTE D;
BYTE E;
BYTE F;
BYTE H;
BYTE L;
/*This part represent the memory banking system*/
BYTE ROMType; /*This variable represents the ROM type MBCx*/
WORD currentROMBank;
BYTE ROMBankType;
BYTE RAMBank[0x10000]; /*This should contains all the RAM banks*/
BYTE currentRAMBank;
BYTE isRAMEnable;
/*This part helps handling the timers*/
int clockBeforeTimer;
int clockBeforeDividerTimer;
/*This is the master interrupt switch*/
BYTE master_interr_switch;
BYTE whenDisableInterrupts;
BYTE enable_interr;
/*This area is for handle the LCD timing*/
int clockScanline;
/*This is the screen*/
BYTE screenData[144][160];
BYTE cpuHalted;
BYTE keymap;
void (*changeBank)(gb *, WORD, BYTE);
struct audio_channel channel_1;
struct audio_channel channel_2;
struct audio_channel channel_3;
struct audio_channel channel_4;
BYTE soundData[2048];
WORD numerOfBytes;
SIGNED_WORD leftSoundBuffer, rightSoundBuffer;
int soundMasterClock;
int soundFrameClock;
int soundFramePos;
};
BYTE readMemory(gb *cpu, WORD addr);
void writeMemory(gb *cpu, WORD addr, BYTE data);
void increaseTimer(gb *cpu, BYTE clocks);
void setTimerFreq(gb *cpu);
void raiseInterrupt(gb *cpu, BYTE code);
void handleInterrupts(gb *cpu);
void handleGraphic(gb *cpu, BYTE cycles);
void DMATransfert(gb *cpu, BYTE data);
void mbc1_changeBank(gb *cpu, WORD addr, BYTE data);
void mbc3_changeBank(gb *cpu, WORD addr, BYTE data);
BYTE getKeypad(gb *cpu);
BYTE executeOpcode(gb *cpu, BYTE opcode);
unsigned int extendedOpcodes(gb *cpu, BYTE opcode);
void writeSaveRam(gb *cpu);
void loadSaveRam(gb *cpu);
void handleSound(gb *cpu, BYTE clocks);
void writeSoundRegistry(gb *cpu, WORD addr, BYTE data);
#endif