305 lines
9.8 KiB
C
305 lines
9.8 KiB
C
#ifndef gb_h
|
|
#define gb_h
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <time.h>
|
|
#include "apu.h"
|
|
|
|
#define GB_STRUCT_VERSION 6
|
|
|
|
enum {
|
|
GB_REGISTER_AF,
|
|
GB_REGISTER_BC,
|
|
GB_REGISTER_DE,
|
|
GB_REGISTER_HL,
|
|
GB_REGISTER_SP,
|
|
GB_REGISTERS_16_BIT /* Count */
|
|
};
|
|
|
|
/* Todo: Actually use these! */
|
|
enum {
|
|
GB_CARRY_FLAG = 16,
|
|
GB_HALF_CARRY_FLAG = 32,
|
|
GB_SUBSTRACT_FLAG = 64,
|
|
GB_ZERO_FLAG = 128,
|
|
};
|
|
|
|
enum {
|
|
/* Joypad and Serial */
|
|
GB_IO_JOYP = 0x00, // Joypad (R/W)
|
|
GB_IO_SB = 0x01, // Serial transfer data (R/W)
|
|
GB_IO_SC = 0x02, // Serial Transfer Control (R/W)
|
|
|
|
/* Missing */
|
|
|
|
/* Timers */
|
|
GB_IO_DIV = 0x04, // Divider Register (R/W)
|
|
GB_IO_TIMA = 0x05, // Timer counter (R/W)
|
|
GB_IO_TMA = 0x06, // Timer Modulo (R/W)
|
|
GB_IO_TAC = 0x07, // Timer Control (R/W)
|
|
|
|
/* Missing */
|
|
|
|
GB_IO_IF = 0x0f, // Interrupt Flag (R/W)
|
|
|
|
/* Sound */
|
|
GB_IO_NR10 = 0x10, // Channel 1 Sweep register (R/W)
|
|
GB_IO_NR11 = 0x11, // Channel 1 Sound length/Wave pattern duty (R/W)
|
|
GB_IO_NR12 = 0x12, // Channel 1 Volume Envelope (R/W)
|
|
GB_IO_NR13 = 0x13, // Channel 1 Frequency lo (Write Only)
|
|
GB_IO_NR14 = 0x14, // Channel 1 Frequency hi (R/W)
|
|
GB_IO_NR21 = 0x16, // Channel 2 Sound Length/Wave Pattern Duty (R/W)
|
|
GB_IO_NR22 = 0x17, // Channel 2 Volume Envelope (R/W)
|
|
GB_IO_NR23 = 0x18, // Channel 2 Frequency lo data (W)
|
|
GB_IO_NR24 = 0x19, // Channel 2 Frequency hi data (R/W)
|
|
GB_IO_NR30 = 0x1a, // Channel 3 Sound on/off (R/W)
|
|
GB_IO_NR31 = 0x1b, // Channel 3 Sound Length
|
|
GB_IO_NR32 = 0x1c, // Channel 3 Select output level (R/W)
|
|
GB_IO_NR33 = 0x1d, // Channel 3 Frequency's lower data (W)
|
|
|
|
GB_IO_NR34 = 0x1e, // Channel 3 Frequency's higher data (R/W)
|
|
|
|
/* Missing */
|
|
|
|
GB_IO_NR41 = 0x20, // Channel 4 Sound Length (R/W)
|
|
GB_IO_NR42 = 0x21, // Channel 4 Volume Envelope (R/W)
|
|
GB_IO_NR43 = 0x22, // Channel 4 Polynomial Counter (R/W)
|
|
GB_IO_NR44 = 0x23, // Channel 4 Counter/consecutive, Inital (R/W)
|
|
GB_IO_NR50 = 0x24, // Channel control / ON-OFF / Volume (R/W)
|
|
GB_IO_NR51 = 0x25, // Selection of Sound output terminal (R/W)
|
|
GB_IO_NR52 = 0x26, // Sound on/off
|
|
|
|
/* Missing */
|
|
|
|
GB_IO_WAV_START = 0x30, // Wave pattern start
|
|
GB_IO_WAV_END = 0x3f, // Wave pattern end
|
|
|
|
/* Graphics */
|
|
GB_IO_LCDC = 0x40, // LCD Control (R/W)
|
|
GB_IO_STAT = 0x41, // LCDC Status (R/W)
|
|
GB_IO_SCY = 0x42, // Scroll Y (R/W)
|
|
GB_IO_SCX = 0x43, // Scroll X (R/W)
|
|
GB_IO_LY = 0x44, // LCDC Y-Coordinate (R)
|
|
GB_IO_LYC = 0x45, // LY Compare (R/W)
|
|
GB_IO_DMA = 0x46, // DMA Transfer and Start Address (W)
|
|
GB_IO_BGP = 0x47, // BG Palette Data (R/W) - Non CGB Mode Only
|
|
GB_IO_OBP0 = 0x48, // Object Palette 0 Data (R/W) - Non CGB Mode Only
|
|
GB_IO_OBP1 = 0x49, // Object Palette 1 Data (R/W) - Non CGB Mode Only
|
|
GB_IO_WY = 0x4a, // Window Y Position (R/W)
|
|
GB_IO_WX = 0x4b, // Window X Position minus 7 (R/W)
|
|
|
|
/* Missing */
|
|
|
|
/* General CGB features */
|
|
GB_IO_KEY1 = 0x4d, // CGB Mode Only - Prepare Speed Switch
|
|
|
|
/* Missing */
|
|
|
|
GB_IO_VBK = 0x4f, // CGB Mode Only - VRAM Bank
|
|
GB_IO_BIOS = 0x50, // Write to disable the BIOS mapping
|
|
|
|
/* CGB DMA */
|
|
GB_IO_HDMA1 = 0x51, // CGB Mode Only - New DMA Source, High
|
|
GB_IO_HDMA2 = 0x52, // CGB Mode Only - New DMA Source, Low
|
|
GB_IO_HDMA3 = 0x53, // CGB Mode Only - New DMA Destination, High
|
|
GB_IO_HDMA4 = 0x54, // CGB Mode Only - New DMA Destination, Low
|
|
GB_IO_HDMA5 = 0x55, // CGB Mode Only - New DMA Length/Mode/Start
|
|
|
|
/* IR */
|
|
GB_IO_RP = 0x56, // CGB Mode Only - Infrared Communications Port
|
|
|
|
/* Missing */
|
|
|
|
/* CGB Paletts */
|
|
GB_IO_BGPI = 0x68, // CGB Mode Only - Background Palette Index
|
|
GB_IO_BGPD = 0x69, // CGB Mode Only - Background Palette Data
|
|
GB_IO_OBPI = 0x6a, // CGB Mode Only - Sprite Palette Index
|
|
GB_IO_OBPD = 0x6b, // CGB Mode Only - Sprite Palette Data
|
|
|
|
GB_IO_DMG_EMULATION = 0x6c, // (FEh) Bit 0 (Read/Write) - CGB Mode Only
|
|
|
|
/* Missing */
|
|
|
|
GB_IO_SVBK = 0x70, // CGB Mode Only - WRAM Bank
|
|
GB_IO_UNKNOWN2 = 0x72, // (00h) - Bit 0-7 (Read/Write)
|
|
GB_IO_UNKNOWN3 = 0x73, // (00h) - Bit 0-7 (Read/Write)
|
|
GB_IO_UNKNOWN4 = 0x74, // (00h) - Bit 0-7 (Read/Write) - CGB Mode Only
|
|
GB_IO_UNKNOWN5 = 0x75, // (8Fh) - Bit 4-6 (Read/Write)
|
|
GB_IO_PCM_12 = 0x76, // Channels 1 and 2 amplitudes
|
|
GB_IO_PCM_34 = 0x77, // Channels 3 and 4 amplitudes
|
|
GB_IO_UNKNOWN8 = 0x7F, // Unknown, write only
|
|
};
|
|
|
|
#define LCDC_PERIOD 70224
|
|
#define CPU_FREQUENCY 0x400000
|
|
#define DIV_CYCLES (0x100)
|
|
#define FRAME_LENGTH 16742706 // in nanoseconds
|
|
|
|
typedef enum {
|
|
GB_LOG_BOLD = 1,
|
|
GB_LOG_DASHED_UNDERLINE = 2,
|
|
GB_LOG_UNDERLINE = 4,
|
|
GB_LOG_UNDERLINE_MASK = GB_LOG_DASHED_UNDERLINE | GB_LOG_UNDERLINE
|
|
} gb_log_attributes;
|
|
|
|
struct GB_gameboy_s;
|
|
typedef struct GB_gameboy_s GB_gameboy_t;
|
|
typedef void (*GB_vblank_callback_t)(GB_gameboy_t *gb);
|
|
typedef void (*GB_log_callback_t)(GB_gameboy_t *gb, const char *string, gb_log_attributes attributes);
|
|
typedef char *(*GB_input_callback_t)(GB_gameboy_t *gb);
|
|
typedef uint32_t (*GB_rgb_encode_callback_t)(GB_gameboy_t *gb, unsigned char r, unsigned char g, unsigned char b);
|
|
|
|
typedef struct {
|
|
enum {
|
|
NO_MBC,
|
|
MBC1,
|
|
MBC2,
|
|
MBC3,
|
|
MBC4, // Does this exist???
|
|
MBC5,
|
|
} mbc_type;
|
|
bool has_ram;
|
|
bool has_battery;
|
|
bool has_rtc;
|
|
bool has_rumble;
|
|
} GB_cartridge_t;
|
|
|
|
typedef struct GB_gameboy_s{
|
|
uintptr_t magic; // States are currently platform dependent
|
|
int version; // and version dependent
|
|
/* Registers */
|
|
unsigned short pc;
|
|
unsigned short registers[GB_REGISTERS_16_BIT];
|
|
bool ime;
|
|
unsigned char interrupt_enable;
|
|
|
|
/* CPU and General Hardware Flags*/
|
|
bool cgb_mode;
|
|
bool is_cgb;
|
|
bool cgb_double_speed;
|
|
bool halted;
|
|
bool stopped;
|
|
|
|
/* HDMA */
|
|
bool hdma_on;
|
|
bool hdma_on_hblank;
|
|
unsigned char hdma_steps_left;
|
|
unsigned short hdma_cycles;
|
|
unsigned short hdma_current_src, hdma_current_dest;
|
|
|
|
/* Memory */
|
|
unsigned char *rom;
|
|
size_t rom_size;
|
|
unsigned short mbc_rom_bank;
|
|
|
|
const GB_cartridge_t *cartridge_type;
|
|
unsigned char *mbc_ram;
|
|
unsigned char mbc_ram_bank;
|
|
size_t mbc_ram_size;
|
|
bool mbc_ram_enable;
|
|
bool mbc_ram_banking;
|
|
|
|
unsigned char *ram;
|
|
unsigned long ram_size; // Different between CGB and DMG
|
|
unsigned char cgb_ram_bank;
|
|
|
|
unsigned char hram[0xFFFF - 0xFF80];
|
|
unsigned char io_registers[0x80];
|
|
|
|
/* Video Display */
|
|
unsigned char *vram;
|
|
unsigned long vram_size; // Different between CGB and DMG
|
|
unsigned char cgb_vram_bank;
|
|
unsigned char oam[0xA0];
|
|
unsigned char background_palletes_data[0x40];
|
|
unsigned char sprite_palletes_data[0x40];
|
|
uint32_t background_palletes_rgb[0x20];
|
|
uint32_t sprite_palletes_rgb[0x20];
|
|
bool ly151_bug_oam;
|
|
bool ly151_bug_hblank;
|
|
signed short previous_lcdc_x;
|
|
signed short line_x_bias;
|
|
bool effective_window_enabled;
|
|
unsigned char effective_window_y;
|
|
|
|
unsigned char bios[0x900];
|
|
bool bios_finished;
|
|
|
|
/* Timing */
|
|
signed long last_vblank;
|
|
unsigned long display_cycles;
|
|
unsigned long div_cycles;
|
|
unsigned long tima_cycles;
|
|
unsigned long dma_cycles;
|
|
double apu_cycles;
|
|
|
|
/* APU */
|
|
GB_apu_t apu;
|
|
int16_t *audio_buffer;
|
|
unsigned int buffer_size;
|
|
unsigned int sample_rate;
|
|
unsigned int audio_position;
|
|
volatile bool audio_copy_in_progress;
|
|
bool audio_stream_started; // detects first copy request to minimize lag
|
|
|
|
/* I/O */
|
|
uint32_t *screen;
|
|
GB_vblank_callback_t vblank_callback;
|
|
|
|
bool keys[8];
|
|
|
|
/* RTC */
|
|
union {
|
|
struct {
|
|
unsigned char rtc_seconds;
|
|
unsigned char rtc_minutes;
|
|
unsigned char rtc_hours;
|
|
unsigned char rtc_days;
|
|
unsigned char rtc_high;
|
|
};
|
|
unsigned char rtc_data[5];
|
|
};
|
|
time_t last_rtc_second;
|
|
|
|
/* Unsaved User */
|
|
struct {} first_unsaved_data;
|
|
bool turbo;
|
|
bool debug_stopped;
|
|
unsigned short breakpoint;
|
|
GB_log_callback_t log_callback;
|
|
GB_input_callback_t input_callback;
|
|
GB_rgb_encode_callback_t rgb_encode_callback;
|
|
void *user_data;
|
|
int debug_call_depth;
|
|
bool debug_fin_command, debug_next_command;
|
|
|
|
} GB_gameboy_t;
|
|
|
|
#ifndef __printflike
|
|
/* Missing from Linux headers. */
|
|
#define __printflike(fmtarg, firstvararg) \
|
|
__attribute__((__format__ (__printf__, fmtarg, firstvararg)))
|
|
#endif
|
|
|
|
void gb_init(GB_gameboy_t *gb);
|
|
void gb_init_cgb(GB_gameboy_t *gb);
|
|
void gb_free(GB_gameboy_t *gb);
|
|
int gb_load_bios(GB_gameboy_t *gb, const char *path);
|
|
int gb_load_rom(GB_gameboy_t *gb, const char *path);
|
|
int gb_save_battery(GB_gameboy_t *gb, const char *path);
|
|
void gb_load_battery(GB_gameboy_t *gb, const char *path);
|
|
int gb_save_state(GB_gameboy_t *gb, const char *path);
|
|
int gb_load_state(GB_gameboy_t *gb, const char *path);
|
|
void gb_run(GB_gameboy_t *gb);
|
|
void gb_set_pixels_output(GB_gameboy_t *gb, uint32_t *output);
|
|
void gb_set_vblank_callback(GB_gameboy_t *gb, GB_vblank_callback_t callback);
|
|
void gb_set_log_callback(GB_gameboy_t *gb, GB_log_callback_t callback);
|
|
void gb_log(GB_gameboy_t *gb, const char *fmt, ...) __printflike(2, 3);
|
|
void gb_attributed_log(GB_gameboy_t *gb, gb_log_attributes attributes, const char *fmt, ...) __printflike(3, 4);
|
|
void gb_set_input_callback(GB_gameboy_t *gb, GB_input_callback_t callback);
|
|
void gb_set_sample_rate(GB_gameboy_t *gb, unsigned int sample_rate);
|
|
void gb_set_rgb_encode_callback(GB_gameboy_t *gb, GB_rgb_encode_callback_t callback);
|
|
|
|
#endif /* gb_h */
|