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bsnes/Core/gb.c

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#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <stdarg.h>
#include <sys/time.h>
#include <sys/select.h>
#include "gb.h"
#include "memory.h"
#include "timing.h"
#include "z80_cpu.h"
#include "joypad.h"
#include "display.h"
#include "debugger.h"
#include "mbc.h"
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);
}
static char *default_input_callback(GB_gameboy_t *gb)
{
char *expression = NULL;
size_t size = 0;
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;
}
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;
}
void GB_init(GB_gameboy_t *gb)
{
memset(gb, 0, sizeof(*gb));
gb->version = GB_STRUCT_VERSION;
gb->ram = malloc(gb->ram_size = 0x2000);
memset(gb->ram, 0, gb->ram_size);
gb->vram = malloc(gb->vram_size = 0x2000);
memset(gb->vram, 0, gb->vram_size);
gb->mbc_rom_bank = 1;
gb->last_rtc_second = time(NULL);
gb->last_vblank = clock();
gb->cgb_ram_bank = 1;
/* Todo: this bypasses the rgb encoder because it is not set yet. */
gb->sprite_palletes_rgb[4] = gb->sprite_palletes_rgb[0] = gb->background_palletes_rgb[0] = 0xFFFFFFFF;
gb->sprite_palletes_rgb[5] = gb->sprite_palletes_rgb[1] = gb->background_palletes_rgb[1] = 0xAAAAAAAA;
gb->sprite_palletes_rgb[6] = gb->sprite_palletes_rgb[2] = gb->background_palletes_rgb[2] = 0x55555555;
gb->input_callback = default_input_callback;
gb->async_input_callback = default_async_input_callback;
gb->cartridge_type = &GB_cart_defs[0]; // Default cartridge type
gb->io_registers[GB_IO_OBP0] = gb->io_registers[GB_IO_OBP1] = 0xFF;
gb->io_registers[GB_IO_JOYP] = 0xF;
gb->io_registers[GB_IO_SC] = 0x7E;
gb->magic = (uintptr_t)'SAME';
}
void GB_init_cgb(GB_gameboy_t *gb)
{
memset(gb, 0, sizeof(*gb));
gb->version = GB_STRUCT_VERSION;
gb->ram = malloc(gb->ram_size = 0x2000 * 8);
memset(gb->ram, 0, gb->ram_size);
gb->vram = malloc(gb->vram_size = 0x2000 * 2);
memset(gb->vram, 0, gb->vram_size);
gb->is_cgb = true;
gb->cgb_mode = true;
gb->mbc_rom_bank = 1;
gb->last_rtc_second = time(NULL);
gb->last_vblank = clock();
gb->cgb_ram_bank = 1;
gb->input_callback = default_input_callback;
gb->async_input_callback = default_async_input_callback;
gb->cartridge_type = &GB_cart_defs[0]; // Default cartridge type
gb->io_registers[GB_IO_OBP0] = gb->io_registers[GB_IO_OBP1] = 0xFF;
gb->io_registers[GB_IO_JOYP] = 0xF;
gb->io_registers[GB_IO_SC] = 0x7C;
gb->magic = 'SAME';
}
void GB_free(GB_gameboy_t *gb)
{
gb->magic = 0;
if (gb->ram) {
free(gb->ram);
}
if (gb->vram) {
free(gb->vram);
}
if (gb->mbc_ram) {
free(gb->mbc_ram);
}
if (gb->rom) {
free(gb->rom);
}
if (gb->audio_buffer) {
free(gb->audio_buffer);
}
if (gb->breakpoints) {
free(gb->breakpoints);
}
for (int i = 0x200; i--;) {
if (gb->bank_symbols[i]) {
GB_map_free(gb->bank_symbols[i]);
}
}
for (int i = 0x400; i--;) {
if (gb->reversed_symbol_map.buckets[i]) {
GB_symbol_t *next = gb->reversed_symbol_map.buckets[i]->next;
free(gb->reversed_symbol_map.buckets[i]);
gb->reversed_symbol_map.buckets[i] = next;
}
}
memset(gb, 0, sizeof(*gb));
}
int GB_load_boot_rom(GB_gameboy_t *gb, const char *path)
{
FILE *f = fopen(path, "rb");
if (!f) return errno;
fread(gb->boot_rom, sizeof(gb->boot_rom), 1, f);
fclose(f);
return 0;
}
int GB_load_rom(GB_gameboy_t *gb, const char *path)
{
FILE *f = fopen(path, "rb");
if (!f) 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++;
}
fseek(f, 0, SEEK_SET);
gb->rom = malloc(gb->rom_size);
memset(gb->rom, 0xFF, gb->rom_size); /* Pad with 0xFFs */
fread(gb->rom, gb->rom_size, 1, f);
fclose(f);
GB_configure_cart(gb);
return 0;
}
static bool dump_section(FILE *f, const void *src, uint32_t size)
{
if (fwrite(&size, 1, sizeof(size), f) != sizeof(size)) {
return false;
}
if (fwrite(src, 1, size, f) != size) {
return false;
}
return true;
}
#define DUMP_SECTION(gb, f, section) dump_section(f, GB_GET_SECTION(gb, section), GB_SECTION_SIZE(section))
/* Todo: we need a sane and protable save state format. */
int GB_save_state(GB_gameboy_t *gb, const char *path)
{
FILE *f = fopen(path, "w");
if (!f) {
return errno;
}
if (fwrite(GB_GET_SECTION(gb, header), 1, GB_SECTION_SIZE(header), f) != GB_SECTION_SIZE(header)) goto error;
if (!DUMP_SECTION(gb, f, core_state)) goto error;
if (!DUMP_SECTION(gb, f, dma )) goto error;
if (!DUMP_SECTION(gb, f, mbc )) goto error;
if (!DUMP_SECTION(gb, f, hram )) goto error;
if (!DUMP_SECTION(gb, f, timing )) goto error;
if (!DUMP_SECTION(gb, f, apu )) goto error;
if (!DUMP_SECTION(gb, f, rtc )) goto error;
if (!DUMP_SECTION(gb, f, video )) goto error;
if (fwrite(gb->mbc_ram, 1, gb->mbc_ram_size, f) != gb->mbc_ram_size) {
goto error;
}
if (fwrite(gb->ram, 1, gb->ram_size, f) != gb->ram_size) {
goto error;
}
if (fwrite(gb->vram, 1, gb->vram_size, f) != gb->vram_size) {
goto error;
}
errno = 0;
error:
fclose(f);
return errno;
}
/* Best-effort read function for maximum future compatibility. */
static bool read_section(FILE *f, void *dest, uint32_t size)
{
uint32_t saved_size = 0;
if (fread(&saved_size, 1, sizeof(size), f) != sizeof(size)) {
return false;
}
if (saved_size <= size) {
if (fread(dest, 1, saved_size, f) != saved_size) {
return false;
}
}
else {
if (fread(dest, 1, size, f) != size) {
return false;
}
fseek(f, saved_size - size, SEEK_CUR);
}
return true;
}
#define READ_SECTION(gb, f, section) read_section(f, GB_GET_SECTION(gb, section), GB_SECTION_SIZE(section))
int GB_load_state(GB_gameboy_t *gb, const char *path)
{
GB_gameboy_t save;
/* Every unread value should be kept the same. */
memcpy(&save, gb, sizeof(save));
FILE *f = fopen(path, "r");
if (!f) {
return errno;
}
if (fread(GB_GET_SECTION(&save, header), 1, GB_SECTION_SIZE(header), f) != GB_SECTION_SIZE(header)) goto error;
if (!READ_SECTION(&save, f, core_state)) goto error;
if (!READ_SECTION(&save, f, dma )) goto error;
if (!READ_SECTION(&save, f, mbc )) goto error;
if (!READ_SECTION(&save, f, hram )) goto error;
if (!READ_SECTION(&save, f, timing )) goto error;
if (!READ_SECTION(&save, f, apu )) goto error;
if (!READ_SECTION(&save, f, rtc )) goto error;
if (!READ_SECTION(&save, f, video )) goto error;
if (gb->magic != save.magic) {
GB_log(gb, "File is not a save state, or is from an incompatible operating system.\n");
errno = -1;
goto error;
}
if (gb->version != save.version) {
GB_log(gb, "Save state is for a different version of SameBoy.\n");
errno = -1;
goto error;
}
if (gb->mbc_ram_size != save.mbc_ram_size) {
GB_log(gb, "Save state has non-matching MBC RAM size.\n");
errno = -1;
goto error;
}
if (gb->ram_size != save.ram_size) {
GB_log(gb, "Save state has non-matching RAM size. Try changing emulated model.\n");
errno = -1;
goto error;
}
if (gb->vram_size != save.vram_size) {
GB_log(gb, "Save state has non-matching VRAM size. Try changing emulated model.\n");
errno = -1;
goto error;
}
if (fread(gb->mbc_ram, 1, gb->mbc_ram_size, f) != gb->mbc_ram_size) {
fclose(f);
return EIO;
}
if (fread(gb->ram, 1, gb->ram_size, f) != gb->ram_size) {
fclose(f);
return EIO;
}
if (fread(gb->vram, 1, gb->vram_size, f) != gb->vram_size) {
fclose(f);
return EIO;
}
memcpy(gb, &save, sizeof(save));
errno = 0;
if (gb->cartridge_type->has_rumble && gb->rumble_callback) {
gb->rumble_callback(gb, gb->rumble_state);
}
error:
fclose(f);
return errno;
}
int GB_save_battery(GB_gameboy_t *gb, const char *path)
{
if (!gb->cartridge_type->has_battery) return 0; // Nothing to save.
if (gb->mbc_ram_size == 0 && !gb->cartridge_type->has_rtc) return 0; /* Claims to have battery, but has no RAM or RTC */
FILE *f = fopen(path, "w");
if (!f) {
return errno;
}
if (fwrite(gb->mbc_ram, 1, gb->mbc_ram_size, f) != gb->mbc_ram_size) {
fclose(f);
return EIO;
}
if (gb->cartridge_type->has_rtc) {
if (fwrite(&gb->rtc_real, 1, sizeof(gb->rtc_real), f) != sizeof(gb->rtc_real)) {
fclose(f);
return EIO;
}
if (fwrite(&gb->last_rtc_second, 1, sizeof(gb->last_rtc_second), f) != sizeof(gb->last_rtc_second)) {
fclose(f);
return EIO;
}
}
errno = 0;
fclose(f);
return errno;
}
/* Loading will silently stop if the format is incomplete */
void GB_load_battery(GB_gameboy_t *gb, const char *path)
{
FILE *f = fopen(path, "r");
if (!f) {
return;
}
if (fread(gb->mbc_ram, 1, gb->mbc_ram_size, f) != gb->mbc_ram_size) {
goto reset_rtc;
}
if (fread(&gb->rtc_real, 1, sizeof(gb->rtc_real), f) != sizeof(gb->rtc_real)) {
goto reset_rtc;
}
if (fread(&gb->last_rtc_second, 1, sizeof(gb->last_rtc_second), f) != sizeof(gb->last_rtc_second)) {
goto reset_rtc;
}
if (gb->last_rtc_second > time(NULL)) {
/* We must reset RTC here, or it will not advance. */
goto reset_rtc;
}
if (gb->last_rtc_second < 852076800) { /* 1/1/97. There weren't any RTC games that time,
so if the value we read is lower it means it wasn't
really RTC data. */
goto reset_rtc;
}
goto exit;
reset_rtc:
gb->last_rtc_second = time(NULL);
gb->rtc_real.high |= 0x80; /* This gives the game a hint that the clock should be reset. */
exit:
fclose(f);
return;
}
void GB_run(GB_gameboy_t *gb)
{
GB_debugger_run(gb);
GB_cpu_run(gb);
if (gb->vblank_just_occured) {
GB_update_joyp(gb);
GB_rtc_run(gb);
GB_debugger_handle_async_commands(gb);
}
}
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)
{
if (gb->input_callback == default_input_callback) {
gb->async_input_callback = NULL;
}
gb->input_callback = callback;
}
void GB_set_async_input_callback(GB_gameboy_t *gb, GB_input_callback_t callback)
{
gb->async_input_callback = callback;
}
void GB_set_rgb_encode_callback(GB_gameboy_t *gb, GB_rgb_encode_callback_t callback)
{
gb->rgb_encode_callback = callback;
}
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, long 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_start_callback(GB_gameboy_t *gb, GB_serial_transfer_start_callback_t callback)
{
gb->serial_transfer_start_callback = callback;
}
void GB_set_serial_transfer_end_callback(GB_gameboy_t *gb, GB_serial_transfer_end_callback_t callback)
{
gb->serial_transfer_end_callback = callback;
}
uint8_t GB_serial_get_data(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];
}
void GB_serial_set_data(GB_gameboy_t *gb, uint8_t 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] = data;
gb->io_registers[GB_IO_IF] |= 8;
}
void GB_set_sample_rate(GB_gameboy_t *gb, unsigned int sample_rate)
{
if (gb->audio_buffer) {
free(gb->audio_buffer);
}
gb->buffer_size = sample_rate / 25; // 40ms delay
gb->audio_buffer = malloc(gb->buffer_size * sizeof(*gb->audio_buffer));
gb->sample_rate = sample_rate;
gb->audio_position = 0;
}
void GB_disconnect_serial(GB_gameboy_t *gb)
{
gb->serial_transfer_start_callback = NULL;
gb->serial_transfer_end_callback = NULL;
/* Reset any internally-emulated device. Currently, only the printer. */
memset(&gb->printer, 0, sizeof(gb->printer));
}
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