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SameBoy/Core/gb.c

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#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <errno.h>
#include <stdarg.h>
#ifndef _WIN32
#include <sys/select.h>
#include <unistd.h>
#endif
#include "random.h"
#include "gb.h"
#ifdef GB_DISABLE_REWIND
#define GB_rewind_free(...)
#define GB_rewind_push(...)
#endif
static inline uint32_t state_magic(void)
{
if (sizeof(bool) == 1) return 'SAME';
return 'S4ME';
}
void GB_attributed_logv(GB_gameboy_t *gb, GB_log_attributes attributes, const char *fmt, va_list args)
{
char *string = NULL;
vasprintf(&string, fmt, args);
if (string) {
if (gb->log_callback) {
gb->log_callback(gb, string, attributes);
}
else {
/* Todo: Add ANSI escape sequences for attributed text */
printf("%s", string);
}
}
free(string);
}
void GB_attributed_log(GB_gameboy_t *gb, GB_log_attributes attributes, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
GB_attributed_logv(gb, attributes, fmt, args);
va_end(args);
}
void GB_log(GB_gameboy_t *gb, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
GB_attributed_logv(gb, 0, fmt, args);
va_end(args);
}
#ifndef GB_DISABLE_DEBUGGER
static char *default_input_callback(GB_gameboy_t *gb)
{
char *expression = NULL;
size_t size = 0;
if (gb->debug_stopped) {
printf(">");
}
if (getline(&expression, &size, stdin) == -1) {
/* The user doesn't have STDIN or used ^D. We make sure the program keeps running. */
GB_set_async_input_callback(gb, NULL); /* Disable async input */
return strdup("c");
}
if (!expression) {
return strdup("");
}
size_t length = strlen(expression);
if (expression[length - 1] == '\n') {
expression[length - 1] = 0;
}
if (expression[0] == '\x03') {
gb->debug_stopped = true;
free(expression);
return strdup("");
}
return expression;
}
static char *default_async_input_callback(GB_gameboy_t *gb)
{
#ifndef _WIN32
fd_set set;
FD_ZERO(&set);
FD_SET(STDIN_FILENO, &set);
struct timeval time = {0,};
if (select(1, &set, NULL, NULL, &time) == 1) {
if (feof(stdin)) {
GB_set_async_input_callback(gb, NULL); /* Disable async input */
return NULL;
}
return default_input_callback(gb);
}
#endif
return NULL;
}
#endif
void GB_init(GB_gameboy_t *gb, GB_model_t model)
{
model = GB_MODEL_DMG_B;
memset(gb, 0, sizeof(*gb));
gb->model = model;
if (GB_is_cgb(gb)) {
gb->ram = malloc(gb->ram_size = 0x1000 * 8);
gb->vram = malloc(gb->vram_size = 0x2000 * 2);
}
else {
gb->ram = malloc(gb->ram_size = 0x2000);
gb->vram = malloc(gb->vram_size = 0x2000);
}
#ifndef GB_DISABLE_DEBUGGER
gb->input_callback = default_input_callback;
gb->async_input_callback = default_async_input_callback;
#endif
gb->clock_multiplier = 1.0;
if (model & GB_MODEL_NO_SFC_BIT) {
/* Disable time syncing. Timing should be done by the SFC emulator. */
gb->turbo = true;
}
GB_reset(gb);
}
GB_model_t GB_get_model(GB_gameboy_t *gb)
{
return gb->model;
}
void GB_free(GB_gameboy_t *gb)
{
gb->magic = 0;
if (gb->ram) {
free(gb->ram);
}
if (gb->vram) {
free(gb->vram);
}
if (gb->rom) {
free(gb->rom);
}
if (gb->breakpoints) {
free(gb->breakpoints);
}
if (gb->nontrivial_jump_state) {
free(gb->nontrivial_jump_state);
}
#ifndef GB_DISABLE_DEBUGGER
GB_debugger_clear_symbols(gb);
#endif
GB_rewind_free(gb);
#ifndef GB_DISABLE_CHEATS
while (gb->cheats) {
GB_remove_cheat(gb, gb->cheats[0]);
}
#endif
memset(gb, 0, sizeof(*gb));
}
int GB_load_boot_rom(GB_gameboy_t *gb, const char *path)
{
return 0;
}
void GB_load_boot_rom_from_buffer(GB_gameboy_t *gb, const unsigned char *buffer, size_t size)
{
}
int GB_load_rom(GB_gameboy_t *gb, const char *path)
{
FILE *f = fopen(path, "rb");
if (!f) {
GB_log(gb, "Could not open ROM: %s.\n", strerror(errno));
return errno;
}
fseek(f, 0, SEEK_END);
gb->rom_size = (ftell(f) + 0x3FFF) & ~0x3FFF; /* Round to bank */
/* And then round to a power of two */
while (gb->rom_size & (gb->rom_size - 1)) {
/* I promise this works. */
gb->rom_size |= gb->rom_size >> 1;
gb->rom_size++;
}
if (gb->rom_size == 0) {
gb->rom_size = 0x8000;
}
fseek(f, 0, SEEK_SET);
if (gb->rom) {
free(gb->rom);
}
gb->rom = malloc(gb->rom_size);
memset(gb->rom, 0xFF, gb->rom_size); /* Pad with 0xFFs */
fread(gb->rom, 1, gb->rom_size, f);
fclose(f);
return 0;
}
int GB_load_isx(GB_gameboy_t *gb, const char *path)
{
FILE *f = fopen(path, "rb");
if (!f) {
GB_log(gb, "Could not open ISX file: %s.\n", strerror(errno));
return errno;
}
char magic[4];
#define READ(x) if (fread(&x, sizeof(x), 1, f) != 1) goto error
fread(magic, 1, sizeof(magic), f);
#ifdef GB_BIG_ENDIAN
bool extended = *(uint32_t *)&magic == 'ISX ';
#else
bool extended = *(uint32_t *)&magic == __builtin_bswap32('ISX ');
#endif
fseek(f, extended? 0x20 : 0, SEEK_SET);
uint8_t *old_rom = gb->rom;
uint32_t old_size = gb->rom_size;
gb->rom = NULL;
gb->rom_size = 0;
while (true) {
uint8_t record_type = 0;
if (fread(&record_type, sizeof(record_type), 1, f) != 1) break;
switch (record_type) {
case 0x01: { // Binary
uint16_t bank;
uint16_t address;
uint16_t length;
uint8_t byte;
READ(byte);
bank = byte;
if (byte >= 0x80) {
READ(byte);
bank |= byte << 8;
}
READ(address);
#ifdef GB_BIG_ENDIAN
address = __builtin_bswap16(address);
#endif
address &= 0x3FFF;
READ(length);
#ifdef GB_BIG_ENDIAN
length = __builtin_bswap16(length);
#endif
size_t needed_size = bank * 0x4000 + address + length;
if (needed_size > 1024 * 1024 * 32) goto error;
if (gb->rom_size < needed_size) {
gb->rom = realloc(gb->rom, needed_size);
memset(gb->rom + gb->rom_size, 0, needed_size - gb->rom_size);
gb->rom_size = needed_size;
}
if (fread(gb->rom + (bank * 0x4000 + address), length, 1, f) != 1) goto error;
break;
}
case 0x11: { // Extended Binary
uint32_t address;
uint32_t length;
READ(address);
#ifdef GB_BIG_ENDIAN
address = __builtin_bswap32(address);
#endif
READ(length);
#ifdef GB_BIG_ENDIAN
length = __builtin_bswap32(length);
#endif
size_t needed_size = address + length;
if (needed_size > 1024 * 1024 * 32) goto error;
if (gb->rom_size < needed_size) {
gb->rom = realloc(gb->rom, needed_size);
memset(gb->rom + gb->rom_size, 0, needed_size - gb->rom_size);
gb->rom_size = needed_size;
}
if (fread(gb->rom + address, length, 1, f) != 1) goto error;
break;
}
case 0x04: { // Symbol
uint16_t count;
uint8_t length;
char name[257];
uint8_t flag;
uint16_t bank;
uint16_t address;
uint8_t byte;
READ(count);
#ifdef GB_BIG_ENDIAN
count = __builtin_bswap16(count);
#endif
while (count--) {
READ(length);
if (fread(name, length, 1, f) != 1) goto error;
name[length] = 0;
READ(flag); // unused
READ(byte);
bank = byte;
if (byte >= 0x80) {
READ(byte);
bank |= byte << 8;
}
READ(address);
#ifdef GB_BIG_ENDIAN
address = __builtin_bswap16(address);
#endif
GB_debugger_add_symbol(gb, bank, address, name);
}
break;
}
case 0x14: { // Extended Binary
uint16_t count;
uint8_t length;
char name[257];
uint8_t flag;
uint32_t address;
READ(count);
#ifdef GB_BIG_ENDIAN
count = __builtin_bswap16(count);
#endif
while (count--) {
READ(length);
if (fread(name, length + 1, 1, f) != 1) goto error;
name[length] = 0;
READ(flag); // unused
READ(address);
#ifdef GB_BIG_ENDIAN
address = __builtin_bswap32(address);
#endif
// TODO: How to convert 32-bit addresses to Bank:Address? Needs to tell RAM and ROM apart
}
break;
}
default:
goto done;
}
}
done:;
#undef READ
if (gb->rom_size == 0) goto error;
size_t needed_size = (gb->rom_size + 0x3FFF) & ~0x3FFF; /* Round to bank */
/* And then round to a power of two */
while (needed_size & (needed_size - 1)) {
/* I promise this works. */
needed_size |= needed_size >> 1;
needed_size++;
}
if (needed_size < 0x8000) {
needed_size = 0x8000;
}
if (gb->rom_size < needed_size) {
gb->rom = realloc(gb->rom, needed_size);
memset(gb->rom + gb->rom_size, 0, needed_size - gb->rom_size);
gb->rom_size = needed_size;
}
if (old_rom) {
free(old_rom);
}
return 0;
error:
GB_log(gb, "Invalid or unsupported ISX file.\n");
if (gb->rom) {
free(gb->rom);
gb->rom = old_rom;
gb->rom_size = old_size;
}
fclose(f);
return -1;
}
void GB_load_rom_from_buffer(GB_gameboy_t *gb, const uint8_t *buffer, size_t size)
{
gb->rom_size = (size + 0x3fff) & ~0x3fff;
while (gb->rom_size & (gb->rom_size - 1)) {
gb->rom_size |= gb->rom_size >> 1;
gb->rom_size++;
}
if (gb->rom_size == 0) {
gb->rom_size = 0x8000;
}
if (gb->rom) {
free(gb->rom);
}
gb->rom = malloc(gb->rom_size);
memset(gb->rom, 0xff, gb->rom_size);
memcpy(gb->rom, buffer, size);
}
typedef struct {
uint8_t seconds;
uint8_t padding1[3];
uint8_t minutes;
uint8_t padding2[3];
uint8_t hours;
uint8_t padding3[3];
uint8_t days;
uint8_t padding4[3];
uint8_t high;
uint8_t padding5[3];
} GB_vba_rtc_time_t;
typedef struct __attribute__((packed)) {
uint64_t last_rtc_second;
uint16_t minutes;
uint16_t days;
uint16_t alarm_minutes, alarm_days;
uint8_t alarm_enabled;
} GB_huc3_rtc_time_t;
typedef union {
struct __attribute__((packed)) {
GB_rtc_time_t rtc_real;
time_t last_rtc_second; /* Platform specific endianess and size */
} sameduck_legacy;
struct {
/* Used by VBA versions with 32-bit timestamp*/
GB_vba_rtc_time_t rtc_real, rtc_latched;
uint32_t last_rtc_second; /* Always little endian */
} vba32;
struct {
/* Used by BGB and VBA versions with 64-bit timestamp*/
GB_vba_rtc_time_t rtc_real, rtc_latched;
uint64_t last_rtc_second; /* Always little endian */
} vba64;
} GB_rtc_save_t;
int GB_save_battery_size(GB_gameboy_t *gb)
{
return 0;
}
int GB_save_battery_to_buffer(GB_gameboy_t *gb, uint8_t *buffer, size_t size)
{
return 0;
}
int GB_save_battery(GB_gameboy_t *gb, const char *path)
{
return 0;
}
void GB_load_battery_from_buffer(GB_gameboy_t *gb, const uint8_t *buffer, size_t size)
{
return;
}
/* Loading will silently stop if the format is incomplete */
void GB_load_battery(GB_gameboy_t *gb, const char *path)
{
return;
}
uint8_t GB_run(GB_gameboy_t *gb)
{
gb->vblank_just_occured = false;
GB_debugger_run(gb);
gb->cycles_since_run = 0;
GB_cpu_run(gb);
if (gb->vblank_just_occured) {
GB_debugger_handle_async_commands(gb);
GB_rewind_push(gb);
}
return gb->cycles_since_run;
}
uint64_t GB_run_frame(GB_gameboy_t *gb)
{
/* Configure turbo temporarily, the user wants to handle FPS capping manually. */
bool old_turbo = gb->turbo;
bool old_dont_skip = gb->turbo_dont_skip;
gb->turbo = true;
gb->turbo_dont_skip = true;
gb->cycles_since_last_sync = 0;
while (true) {
GB_run(gb);
if (gb->vblank_just_occured) {
break;
}
}
gb->turbo = old_turbo;
gb->turbo_dont_skip = old_dont_skip;
return gb->cycles_since_last_sync * 1000000000LL / 2 / GB_get_clock_rate(gb); /* / 2 because we use 8MHz units */
}
void GB_set_pixels_output(GB_gameboy_t *gb, uint32_t *output)
{
gb->screen = output;
}
void GB_set_vblank_callback(GB_gameboy_t *gb, GB_vblank_callback_t callback)
{
gb->vblank_callback = callback;
}
void GB_set_log_callback(GB_gameboy_t *gb, GB_log_callback_t callback)
{
gb->log_callback = callback;
}
void GB_set_input_callback(GB_gameboy_t *gb, GB_input_callback_t callback)
{
#ifndef GB_DISABLE_DEBUGGER
if (gb->input_callback == default_input_callback) {
gb->async_input_callback = NULL;
}
gb->input_callback = callback;
#endif
}
void GB_set_async_input_callback(GB_gameboy_t *gb, GB_input_callback_t callback)
{
#ifndef GB_DISABLE_DEBUGGER
gb->async_input_callback = callback;
#endif
}
const GB_palette_t GB_PALETTE_GREY = {{{0x00, 0x00, 0x00}, {0x55, 0x55, 0x55}, {0xaa, 0xaa, 0xaa}, {0xff, 0xff, 0xff}, {0xff, 0xff, 0xff}}};
const GB_palette_t GB_PALETTE_DMG = {{{0x08, 0x18, 0x10}, {0x39, 0x61, 0x39}, {0x84, 0xa5, 0x63}, {0xc6, 0xde, 0x8c}, {0xd2, 0xe6, 0xa6}}};
const GB_palette_t GB_PALETTE_MGB = {{{0x07, 0x10, 0x0e}, {0x3a, 0x4c, 0x3a}, {0x81, 0x8d, 0x66}, {0xc2, 0xce, 0x93}, {0xcf, 0xda, 0xac}}};
const GB_palette_t GB_PALETTE_GBL = {{{0x0a, 0x1c, 0x15}, {0x35, 0x78, 0x62}, {0x56, 0xb4, 0x95}, {0x7f, 0xe2, 0xc3}, {0x91, 0xea, 0xd0}}};
static void update_dmg_palette(GB_gameboy_t *gb)
{
const GB_palette_t *palette = gb->dmg_palette ?: &GB_PALETTE_GREY;
if (gb->rgb_encode_callback && !GB_is_cgb(gb)) {
gb->sprite_palettes_rgb[4] = gb->sprite_palettes_rgb[0] = gb->background_palettes_rgb[0] =
gb->rgb_encode_callback(gb, palette->colors[3].r, palette->colors[3].g, palette->colors[3].b);
gb->sprite_palettes_rgb[5] = gb->sprite_palettes_rgb[1] = gb->background_palettes_rgb[1] =
gb->rgb_encode_callback(gb, palette->colors[2].r, palette->colors[2].g, palette->colors[2].b);
gb->sprite_palettes_rgb[6] = gb->sprite_palettes_rgb[2] = gb->background_palettes_rgb[2] =
gb->rgb_encode_callback(gb, palette->colors[1].r, palette->colors[1].g, palette->colors[1].b);
gb->sprite_palettes_rgb[7] = gb->sprite_palettes_rgb[3] = gb->background_palettes_rgb[3] =
gb->rgb_encode_callback(gb, palette->colors[0].r, palette->colors[0].g, palette->colors[0].b);
// LCD off color
gb->background_palettes_rgb[4] =
gb->rgb_encode_callback(gb, palette->colors[4].r, palette->colors[4].g, palette->colors[4].b);
}
}
void GB_set_palette(GB_gameboy_t *gb, const GB_palette_t *palette)
{
gb->dmg_palette = palette;
update_dmg_palette(gb);
}
void GB_set_rgb_encode_callback(GB_gameboy_t *gb, GB_rgb_encode_callback_t callback)
{
gb->rgb_encode_callback = callback;
update_dmg_palette(gb);
for (unsigned i = 0; i < 32; i++) {
GB_palette_changed(gb, true, i * 2);
GB_palette_changed(gb, false, i * 2);
}
}
void GB_set_infrared_callback(GB_gameboy_t *gb, GB_infrared_callback_t callback)
{
gb->infrared_callback = callback;
}
void GB_set_infrared_input(GB_gameboy_t *gb, bool state)
{
gb->infrared_input = state;
gb->cycles_since_input_ir_change = 0;
gb->ir_queue_length = 0;
}
void GB_queue_infrared_input(GB_gameboy_t *gb, bool state, uint64_t cycles_after_previous_change)
{
if (gb->ir_queue_length == GB_MAX_IR_QUEUE) {
GB_log(gb, "IR Queue is full\n");
return;
}
gb->ir_queue[gb->ir_queue_length++] = (GB_ir_queue_item_t){state, cycles_after_previous_change};
}
void GB_set_rumble_callback(GB_gameboy_t *gb, GB_rumble_callback_t callback)
{
gb->rumble_callback = callback;
}
void GB_set_serial_transfer_bit_start_callback(GB_gameboy_t *gb, GB_serial_transfer_bit_start_callback_t callback)
{
gb->serial_transfer_bit_start_callback = callback;
}
void GB_set_serial_transfer_bit_end_callback(GB_gameboy_t *gb, GB_serial_transfer_bit_end_callback_t callback)
{
gb->serial_transfer_bit_end_callback = callback;
}
bool GB_serial_get_data_bit(GB_gameboy_t *gb)
{
if (gb->io_registers[GB_IO_SC] & 1) {
/* Internal Clock */
GB_log(gb, "Serial read request while using internal clock. \n");
return 0xFF;
}
return gb->io_registers[GB_IO_SB] & 0x80;
}
void GB_serial_set_data_bit(GB_gameboy_t *gb, bool data)
{
if (gb->io_registers[GB_IO_SC] & 1) {
/* Internal Clock */
GB_log(gb, "Serial write request while using internal clock. \n");
return;
}
gb->io_registers[GB_IO_SB] <<= 1;
gb->io_registers[GB_IO_SB] |= data;
gb->serial_count++;
if (gb->serial_count == 8) {
gb->io_registers[GB_IO_IF] |= 8;
gb->serial_count = 0;
}
}
void GB_disconnect_serial(GB_gameboy_t *gb)
{
gb->serial_transfer_bit_start_callback = NULL;
gb->serial_transfer_bit_end_callback = NULL;
/* Reset any internally-emulated device. */
memset(&gb->printer, 0, sizeof(gb->printer));
memset(&gb->workboy, 0, sizeof(gb->workboy));
}
bool GB_is_inited(GB_gameboy_t *gb)
{
return gb->magic == state_magic();
}
void GB_set_turbo_mode(GB_gameboy_t *gb, bool on, bool no_frame_skip)
{
gb->turbo = on;
gb->turbo_dont_skip = no_frame_skip;
}
void GB_set_rendering_disabled(GB_gameboy_t *gb, bool disabled)
{
gb->disable_rendering = disabled;
}
void *GB_get_user_data(GB_gameboy_t *gb)
{
return gb->user_data;
}
void GB_set_user_data(GB_gameboy_t *gb, void *data)
{
gb->user_data = data;
}
static void reset_ram(GB_gameboy_t *gb)
{
switch (gb->model) {
case GB_MODEL_CGB_E:
case GB_MODEL_AGB: /* Unverified */
for (unsigned i = 0; i < gb->ram_size; i++) {
gb->ram[i] = GB_random();
}
break;
case GB_MODEL_DMG_B:
case GB_MODEL_SGB_NTSC: /* Unverified*/
case GB_MODEL_SGB_PAL: /* Unverified */
case GB_MODEL_SGB_NTSC_NO_SFC: /* Unverified */
case GB_MODEL_SGB_PAL_NO_SFC: /* Unverified */
for (unsigned i = 0; i < gb->ram_size; i++) {
gb->ram[i] = GB_random();
if (i & 0x100) {
gb->ram[i] &= GB_random();
}
else {
gb->ram[i] |= GB_random();
}
}
break;
case GB_MODEL_SGB2:
case GB_MODEL_SGB2_NO_SFC:
for (unsigned i = 0; i < gb->ram_size; i++) {
gb->ram[i] = 0x55;
gb->ram[i] ^= GB_random() & GB_random() & GB_random();
}
break;
case GB_MODEL_CGB_C:
for (unsigned i = 0; i < gb->ram_size; i++) {
if ((i & 0x808) == 0x800 || (i & 0x808) == 0x008) {
gb->ram[i] = 0;
}
else {
gb->ram[i] = GB_random() | GB_random() | GB_random() | GB_random();
}
}
break;
}
/* HRAM */
switch (gb->model) {
case GB_MODEL_CGB_C:
// case GB_MODEL_CGB_D:
case GB_MODEL_CGB_E:
case GB_MODEL_AGB:
for (unsigned i = 0; i < sizeof(gb->hram); i++) {
gb->hram[i] = GB_random();
}
break;
case GB_MODEL_DMG_B:
case GB_MODEL_SGB_NTSC: /* Unverified*/
case GB_MODEL_SGB_PAL: /* Unverified */
case GB_MODEL_SGB_NTSC_NO_SFC: /* Unverified */
case GB_MODEL_SGB_PAL_NO_SFC: /* Unverified */
case GB_MODEL_SGB2:
case GB_MODEL_SGB2_NO_SFC:
for (unsigned i = 0; i < sizeof(gb->hram); i++) {
if (i & 1) {
gb->hram[i] = GB_random() | GB_random() | GB_random();
}
else {
gb->hram[i] = GB_random() & GB_random() & GB_random();
}
}
break;
}
/* OAM */
switch (gb->model) {
case GB_MODEL_CGB_C:
case GB_MODEL_CGB_E:
case GB_MODEL_AGB:
/* Zero'd out by boot ROM anyway*/
break;
case GB_MODEL_DMG_B:
case GB_MODEL_SGB_NTSC: /* Unverified */
case GB_MODEL_SGB_PAL: /* Unverified */
case GB_MODEL_SGB_NTSC_NO_SFC: /* Unverified */
case GB_MODEL_SGB_PAL_NO_SFC: /* Unverified */
case GB_MODEL_SGB2:
case GB_MODEL_SGB2_NO_SFC:
for (unsigned i = 0; i < 8; i++) {
if (i & 2) {
gb->oam[i] = GB_random() & GB_random() & GB_random();
}
else {
gb->oam[i] = GB_random() | GB_random() | GB_random();
}
}
for (unsigned i = 8; i < sizeof(gb->oam); i++) {
gb->oam[i] = gb->oam[i - 8];
}
break;
}
/* Wave RAM */
switch (gb->model) {
case GB_MODEL_CGB_C:
case GB_MODEL_CGB_E:
case GB_MODEL_AGB:
/* Initialized by CGB-A and newer, 0s in CGB-0*/
break;
case GB_MODEL_DMG_B:
case GB_MODEL_SGB_NTSC: /* Unverified*/
case GB_MODEL_SGB_PAL: /* Unverified */
case GB_MODEL_SGB_NTSC_NO_SFC: /* Unverified */
case GB_MODEL_SGB_PAL_NO_SFC: /* Unverified */
case GB_MODEL_SGB2:
case GB_MODEL_SGB2_NO_SFC: {
uint8_t temp;
for (unsigned i = 0; i < GB_IO_WAV_END - GB_IO_WAV_START; i++) {
if (i & 1) {
temp = GB_random() & GB_random() & GB_random();
}
else {
temp = GB_random() | GB_random() | GB_random();
}
gb->apu.wave_channel.wave_form[i * 2] = temp >> 4;
gb->apu.wave_channel.wave_form[i * 2 + 1] = temp & 0xF;
gb->io_registers[GB_IO_WAV_START + i] = temp;
}
break;
}
}
for (unsigned i = 0; i < sizeof(gb->extra_oam); i++) {
gb->extra_oam[i] = GB_random();
}
if (GB_is_cgb(gb)) {
for (unsigned i = 0; i < 64; i++) {
gb->background_palettes_data[i] = GB_random(); /* Doesn't really matter as the boot ROM overrides it anyway*/
gb->sprite_palettes_data[i] = GB_random();
}
for (unsigned i = 0; i < 32; i++) {
GB_palette_changed(gb, true, i * 2);
GB_palette_changed(gb, false, i * 2);
}
}
}
static void request_boot_rom(GB_gameboy_t *gb)
{
}
void GB_reset(GB_gameboy_t *gb)
{
GB_model_t model = gb->model;
memset(gb, 0, (size_t)GB_GET_SECTION((GB_gameboy_t *) 0, unsaved));
gb->model = model;
gb->version = GB_STRUCT_VERSION;
gb->mbc_rom_bank = 1;
gb->last_rtc_second = time(NULL);
gb->cgb_ram_bank = 1;
gb->io_registers[GB_IO_JOYP] = 0xCF;
if (GB_is_cgb(gb)) {
gb->ram_size = 0x1000 * 8;
gb->vram_size = 0x2000 * 2;
memset(gb->vram, 0, gb->vram_size);
gb->cgb_mode = true;
gb->object_priority = GB_OBJECT_PRIORITY_INDEX;
}
else {
gb->ram_size = 0x2000;
gb->vram_size = 0x2000;
memset(gb->vram, 0, gb->vram_size);
gb->object_priority = GB_OBJECT_PRIORITY_X;
update_dmg_palette(gb);
}
reset_ram(gb);
/* The serial interrupt always occur on the 0xF7th cycle of every 0x100 cycle since boot. */
gb->serial_cycles = 0x100-0xF7;
gb->io_registers[GB_IO_SC] = 0x7E;
/* These are not deterministic, but 00 (CGB) and FF (DMG) are the most common initial values by far */
gb->io_registers[GB_IO_DMA] = gb->io_registers[GB_IO_OBP0] = gb->io_registers[GB_IO_OBP1] = GB_is_cgb(gb)? 0x00 : 0xFF;
gb->accessed_oam_row = -1;
/* Todo: Ugly, fixme, see comment in the timer state machine */
gb->div_state = 3;
GB_apu_update_cycles_per_sample(gb);
if (gb->nontrivial_jump_state) {
free(gb->nontrivial_jump_state);
gb->nontrivial_jump_state = NULL;
}
gb->magic = state_magic();
request_boot_rom(gb);
}
void GB_switch_model_and_reset(GB_gameboy_t *gb, GB_model_t model)
{
model = GB_MODEL_DMG_B;
gb->model = model;
if (GB_is_cgb(gb)) {
gb->ram = realloc(gb->ram, gb->ram_size = 0x1000 * 8);
gb->vram = realloc(gb->vram, gb->vram_size = 0x2000 * 2);
}
else {
gb->ram = realloc(gb->ram, gb->ram_size = 0x2000);
gb->vram = realloc(gb->vram, gb->vram_size = 0x2000);
}
GB_rewind_free(gb);
GB_reset(gb);
}
void *GB_get_direct_access(GB_gameboy_t *gb, GB_direct_access_t access, size_t *size, uint16_t *bank)
{
/* Set size and bank to dummy pointers if not set */
size_t dummy_size;
uint16_t dummy_bank;
if (!size) {
size = &dummy_size;
}
if (!bank) {
bank = &dummy_bank;
}
switch (access) {
case GB_DIRECT_ACCESS_ROM:
*size = gb->rom_size;
*bank = gb->mbc_rom_bank;
return gb->rom;
case GB_DIRECT_ACCESS_RAM:
*size = gb->ram_size;
*bank = gb->cgb_ram_bank;
return gb->ram;
case GB_DIRECT_ACCESS_CART_RAM:
*size = 0;
*bank = 0;
return NULL;
case GB_DIRECT_ACCESS_VRAM:
*size = gb->vram_size;
*bank = gb->cgb_vram_bank;
return gb->vram;
case GB_DIRECT_ACCESS_HRAM:
*size = sizeof(gb->hram);
*bank = 0;
return &gb->hram;
case GB_DIRECT_ACCESS_IO:
*size = sizeof(gb->io_registers);
*bank = 0;
return &gb->io_registers;
case GB_DIRECT_ACCESS_BOOTROM:
*size = 0;
*bank = 0;
return NULL;
case GB_DIRECT_ACCESS_OAM:
*size = sizeof(gb->oam);
*bank = 0;
return &gb->oam;
case GB_DIRECT_ACCESS_BGP:
*size = sizeof(gb->background_palettes_data);
*bank = 0;
return &gb->background_palettes_data;
case GB_DIRECT_ACCESS_OBP:
*size = sizeof(gb->sprite_palettes_data);
*bank = 0;
return &gb->sprite_palettes_data;
case GB_DIRECT_ACCESS_IE:
*size = sizeof(gb->interrupt_enable);
*bank = 0;
return &gb->interrupt_enable;
default:
*size = 0;
*bank = 0;
return NULL;
}
}
void GB_set_clock_multiplier(GB_gameboy_t *gb, double multiplier)
{
gb->clock_multiplier = multiplier;
GB_apu_update_cycles_per_sample(gb);
}
uint32_t GB_get_clock_rate(GB_gameboy_t *gb)
{
if (gb->model & GB_MODEL_PAL_BIT) {
return SGB_PAL_FREQUENCY * gb->clock_multiplier;
}
if ((gb->model & ~GB_MODEL_NO_SFC_BIT) == GB_MODEL_SGB) {
return SGB_NTSC_FREQUENCY * gb->clock_multiplier;
}
return CPU_FREQUENCY * gb->clock_multiplier;
}
void GB_set_border_mode(GB_gameboy_t *gb, GB_border_mode_t border_mode)
{
if (gb->border_mode > GB_BORDER_ALWAYS) return;
gb->border_mode = border_mode;
}
unsigned GB_get_screen_width(GB_gameboy_t *gb)
{
switch (gb->border_mode) {
default:
case GB_BORDER_SGB:
return GB_is_hle_sgb(gb)? 256 : 160;
case GB_BORDER_NEVER:
return 160;
case GB_BORDER_ALWAYS:
return 256;
}
}
unsigned GB_get_screen_height(GB_gameboy_t *gb)
{
switch (gb->border_mode) {
default:
case GB_BORDER_SGB:
return GB_is_hle_sgb(gb)? 224 : 144;
case GB_BORDER_NEVER:
return 144;
case GB_BORDER_ALWAYS:
return 224;
}
}
unsigned GB_get_player_count(GB_gameboy_t *gb)
{
return 1;
}
void GB_set_update_input_hint_callback(GB_gameboy_t *gb, GB_update_input_hint_callback_t callback)
{
gb->update_input_hint_callback = callback;
}
double GB_get_usual_frame_rate(GB_gameboy_t *gb)
{
return GB_get_clock_rate(gb) / (double)LCDC_PERIOD;
}
void GB_set_joyp_write_callback(GB_gameboy_t *gb, GB_joyp_write_callback_t callback)
{
gb->joyp_write_callback = callback;
}
void GB_set_icd_pixel_callback(GB_gameboy_t *gb, GB_icd_pixel_callback_t callback)
{
gb->icd_pixel_callback = callback;
}
void GB_set_icd_hreset_callback(GB_gameboy_t *gb, GB_icd_hreset_callback_t callback)
{
gb->icd_hreset_callback = callback;
}
void GB_set_icd_vreset_callback(GB_gameboy_t *gb, GB_icd_vreset_callback_t callback)
{
gb->icd_vreset_callback = callback;
}
void GB_set_boot_rom_load_callback(GB_gameboy_t *gb, GB_boot_rom_load_callback_t callback)
{
gb->boot_rom_load_callback = callback;
request_boot_rom(gb);
}
unsigned GB_time_to_alarm(GB_gameboy_t *gb)
{
return 0;
}
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