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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 "gb.h"
#include "memory.h"
#include "timing.h"
#include "z80_cpu.h"
#include "joypad.h"
#include "display.h"
#include "debugger.h"
static const GB_cartridge_t cart_defs[256] = {
// From http://gbdev.gg8.se/wiki/articles/The_Cartridge_Header#0147_-_Cartridge_Type
/* MBC RAM BAT. RTC RUMB. */
{ NO_MBC, false, false, false, false}, // 00h ROM ONLY
{ MBC1 , false, false, false, false}, // 01h MBC1
{ MBC1 , true , false, false, false}, // 02h MBC1+RAM
{ MBC1 , true , true , false, false}, // 03h MBC1+RAM+BATTERY
[5] =
{ MBC2 , true , false, false, false}, // 05h MBC2
{ MBC2 , true , true , false, false}, // 06h MBC2+BATTERY
[8] =
{ NO_MBC, true , false, false, false}, // 08h ROM+RAM
{ NO_MBC, true , true , false, false}, // 09h ROM+RAM+BATTERY
[0xB] =
// Todo: What are these?
{ NO_MBC, false, false, false, false}, // 0Bh MMM01
{ NO_MBC, false, false, false, false}, // 0Ch MMM01+RAM
{ NO_MBC, false, false, false, false}, // 0Dh MMM01+RAM+BATTERY
[0xF] =
{ MBC3 , false, true, true , false}, // 0Fh MBC3+TIMER+BATTERY
{ MBC3 , true , true, true , false}, // 10h MBC3+TIMER+RAM+BATTERY
{ MBC3 , false, false, false, false}, // 11h MBC3
{ MBC3 , true , false, false, false}, // 12h MBC3+RAM
{ MBC3 , true , true , false, false}, // 13h MBC3+RAM+BATTERY
[0x15] =
// Todo: Do these exist?
{ MBC4 , false, false, false, false}, // 15h MBC4
{ MBC4 , true , false, false, false}, // 16h MBC4+RAM
{ MBC4 , true , true , false, false}, // 17h MBC4+RAM+BATTERY
[0x19] =
{ MBC5 , false, false, false, false}, // 19h MBC5
{ MBC5 , true , false, false, false}, // 1Ah MBC5+RAM
{ MBC5 , true , true , false, false}, // 1Bh MBC5+RAM+BATTERY
{ MBC5 , false, false, false, true }, // 1Ch MBC5+RUMBLE
{ MBC5 , true , false, false, true }, // 1Dh MBC5+RUMBLE+RAM
{ MBC5 , true , true , false, true }, // 1Eh MBC5+RUMBLE+RAM+BATTERY
[0xFC] =
// Todo: What are these?
{ NO_MBC, false, false, false, false}, // FCh POCKET CAMERA
{ NO_MBC, false, false, false, false}, // FDh BANDAI TAMA5
{ NO_MBC, false, false, false, false}, // FEh HuC3
{ NO_MBC, true , true , false, false}, // FFh HuC1+RAM+BATTERY
};
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;
printf(">");
getline(&expression, &size, stdin);
if (!expression) {
return strdup("");
}
size_t length = strlen(expression);
if (expression[length - 1] == '\n') {
expression[length - 1] = 0;
}
return expression;
}
void gb_init(GB_gameboy_t *gb)
{
memset(gb, 0, sizeof(*gb));
gb->magic = (uintptr_t)'SAME';
gb->version = GB_STRUCT_VERSION;
gb->ram = malloc(gb->ram_size = 0x2000);
gb->vram = malloc(gb->vram_size = 0x2000);
struct timeval now;
gettimeofday(&now, NULL);
gb->last_vblank = (now.tv_usec) * 1000 + now.tv_sec * 1000000000L;;
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->cartridge_type = &cart_defs[0]; // Default cartridge type
}
void gb_init_cgb(GB_gameboy_t *gb)
{
memset(gb, 0, sizeof(*gb));
gb->magic = (uintptr_t)'SAME';
gb->version = GB_STRUCT_VERSION;
gb->ram = malloc(gb->ram_size = 0x2000 * 8);
gb->vram = malloc(gb->vram_size = 0x2000 * 2);
gb->is_cgb = true;
gb->cgb_mode = true;
struct timeval now;
gettimeofday(&now, NULL);
gb->last_vblank = (now.tv_usec) * 1000 + now.tv_sec * 1000000000L;
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->cartridge_type = &cart_defs[0]; // Default cartridge type
}
void gb_free(GB_gameboy_t *gb)
{
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);
}
}
int gb_load_bios(GB_gameboy_t *gb, const char *path)
{
FILE *f = fopen(path, "r");
if (!f) return errno;
fread(gb->bios, sizeof(gb->bios), 1, f);
fclose(f);
return 0;
}
int gb_load_rom(GB_gameboy_t *gb, const char *path)
{
FILE *f = fopen(path, "r");
if (!f) return errno;
fseek(f, 0, SEEK_END);
gb->rom_size = (ftell(f) + 0x3FFF) & ~0x3FFF; /* Round to bank */
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->cartridge_type = &cart_defs[gb->rom[0x147]];
if (gb->cartridge_type->has_ram) {
static const int ram_sizes[256] = {0, 0x800, 0x2000, 0x8000, 0x20000, 0x10000};
gb->mbc_ram_size = ram_sizes[gb->rom[0x149]];
gb->mbc_ram = malloc(gb->mbc_ram_size);
}
return 0;
}
/* Todo: we need a sane and protable save state format. */
int gb_save_state(GB_gameboy_t *gb, const char *path)
{
GB_gameboy_t save;
memcpy(&save, gb, offsetof(GB_gameboy_t, first_unsaved_data));
save.cartridge_type = NULL; // Kept from load_rom
save.rom = NULL; // Kept from load_rom
save.rom_size = 0; // Kept from load_rom
save.mbc_ram = NULL;
save.ram = NULL;
save.vram = NULL;
save.screen = NULL; // Kept from user
save.audio_buffer = NULL; // Kept from user
save.buffer_size = 0; // Kept from user
save.sample_rate = 0; // Kept from user
save.audio_position = 0; // Kept from previous state
save.vblank_callback = NULL;
save.user_data = NULL;
memset(save.keys, 0, sizeof(save.keys)); // Kept from user
FILE *f = fopen(path, "w");
if (!f) {
return errno;
}
if (fwrite(&save, 1, offsetof(GB_gameboy_t, first_unsaved_data), f) != offsetof(GB_gameboy_t, first_unsaved_data)) {
fclose(f);
return EIO;
}
if (fwrite(gb->mbc_ram, 1, gb->mbc_ram_size, f) != gb->mbc_ram_size) {
fclose(f);
return EIO;
}
if (fwrite(gb->ram, 1, gb->ram_size, f) != gb->ram_size) {
fclose(f);
return EIO;
}
if (fwrite(gb->vram, 1, gb->vram_size, f) != gb->vram_size) {
fclose(f);
return EIO;
}
errno = 0;
fclose(f);
return errno;
}
int gb_load_state(GB_gameboy_t *gb, const char *path)
{
GB_gameboy_t save;
FILE *f = fopen(path, "r");
if (!f) {
return errno;
}
if (fread(&save, 1, offsetof(GB_gameboy_t, first_unsaved_data), f) != offsetof(GB_gameboy_t, first_unsaved_data)) {
fclose(f);
return EIO;
}
save.cartridge_type = gb->cartridge_type;
save.rom = gb->rom;
save.rom_size = gb->rom_size;
save.mbc_ram = gb->mbc_ram;
save.ram = gb->ram;
save.vram = gb->vram;
save.screen = gb->screen;
save.audio_buffer = gb->audio_buffer;
save.buffer_size = gb->buffer_size;
save.sample_rate = gb->sample_rate;
save.audio_position = gb->audio_position;
save.vblank_callback = gb->vblank_callback;
save.user_data = gb->user_data;
memcpy(save.keys, gb->keys, sizeof(save.keys));
if (gb->magic != save.magic) {
gb_log(gb, "File is not a save state, or is from an incompatible operating system.\n");
fclose(f);
return -1;
}
if (gb->version != save.version) {
gb_log(gb, "Save state is for a different version of SameBoy.\n");
fclose(f);
return -1;
}
if (gb->mbc_ram_size != save.mbc_ram_size) {
gb_log(gb, "Save state has non-matching MBC RAM size.\n");
fclose(f);
return -1;
}
if (gb->ram_size != save.ram_size) {
gb_log(gb, "Save state has non-matching RAM size. Try changing emulated model.\n");
fclose(f);
return -1;
}
if (gb->vram_size != save.vram_size) {
gb_log(gb, "Save state has non-matching VRAM size. Try changing emulated model.\n");
fclose(f);
return -1;
}
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, offsetof(GB_gameboy_t, first_unsaved_data));
errno = 0;
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.
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_data, 1, sizeof(gb->rtc_data), f) != sizeof(gb->rtc_data)) {
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_data, 1, sizeof(gb->rtc_data), f) != sizeof(gb->rtc_data)) {
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_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)
{
update_joyp(gb);
debugger_run(gb);
cpu_run(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)
{
gb->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_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 * 2);
gb->sample_rate = sample_rate;
gb->audio_position = 0;
}
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