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SameBoy/SDL/main.c

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#include <stdbool.h>
#include <stdio.h>
#include <signal.h>
#include <ctype.h>
#include <OpenDialog/open_dialog.h>
#include <SDL.h>
#include <Core/gb.h>
#include "utils.h"
#include "gui.h"
#include "shader.h"
#include "audio/audio.h"
#ifndef _WIN32
#include <unistd.h>
#else
#include <Windows.h>
#endif
GB_gameboy_t gb;
static bool paused = false;
static uint32_t pixel_buffer_1[256 * 224], pixel_buffer_2[256 * 224];
static uint32_t *active_pixel_buffer = pixel_buffer_1, *previous_pixel_buffer = pixel_buffer_2;
static bool underclock_down = false, rewind_down = false, do_rewind = false, rewind_paused = false, turbo_down = false;
static double clock_mutliplier = 1.0;
static char *filename = NULL;
static typeof(free) *free_function = NULL;
static char *battery_save_path_ptr;
void set_filename(const char *new_filename, typeof(free) *new_free_function)
{
if (filename && free_function) {
free_function(filename);
}
filename = (char *) new_filename;
free_function = new_free_function;
}
static char *captured_log = NULL;
static void log_capture_callback(GB_gameboy_t *gb, const char *string, GB_log_attributes attributes)
{
size_t current_len = strlen(captured_log);
size_t len_to_add = strlen(string);
captured_log = realloc(captured_log, current_len + len_to_add + 1);
memcpy(captured_log + current_len, string, len_to_add);
captured_log[current_len + len_to_add] = 0;
}
static void start_capturing_logs(void)
{
if (captured_log != NULL) {
free(captured_log);
}
captured_log = malloc(1);
captured_log[0] = 0;
GB_set_log_callback(&gb, log_capture_callback);
}
static const char *end_capturing_logs(bool show_popup, bool should_exit)
{
GB_set_log_callback(&gb, NULL);
if (captured_log[0] == 0) {
free(captured_log);
captured_log = NULL;
}
else {
if (show_popup) {
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Error", captured_log, window);
}
if (should_exit) {
exit(1);
}
}
return captured_log;
}
static void update_palette(void)
{
switch (configuration.dmg_palette) {
case 1:
GB_set_palette(&gb, &GB_PALETTE_DMG);
break;
case 2:
GB_set_palette(&gb, &GB_PALETTE_MGB);
break;
case 3:
GB_set_palette(&gb, &GB_PALETTE_GBL);
break;
default:
GB_set_palette(&gb, &GB_PALETTE_GREY);
}
}
static void screen_size_changed(void)
{
SDL_DestroyTexture(texture);
texture = SDL_CreateTexture(renderer, SDL_GetWindowPixelFormat(window), SDL_TEXTUREACCESS_STREAMING,
GB_get_screen_width(&gb), GB_get_screen_height(&gb));
SDL_SetWindowMinimumSize(window, GB_get_screen_width(&gb), GB_get_screen_height(&gb));
update_viewport();
}
static void open_menu(void)
{
bool audio_playing = GB_audio_is_playing();
if (audio_playing) {
GB_audio_set_paused(true);
}
size_t previous_width = GB_get_screen_width(&gb);
run_gui(true);
SDL_ShowCursor(SDL_DISABLE);
if (audio_playing) {
GB_audio_set_paused(false);
}
GB_set_color_correction_mode(&gb, configuration.color_correction_mode);
GB_set_light_temperature(&gb, (configuration.color_temperature - 10.0) / 10.0);
GB_set_interference_volume(&gb, configuration.interference_volume / 100.0);
GB_set_border_mode(&gb, configuration.border_mode);
update_palette();
GB_set_highpass_filter_mode(&gb, configuration.highpass_mode);
GB_set_rewind_length(&gb, configuration.rewind_length);
GB_set_rtc_mode(&gb, configuration.rtc_mode);
if (previous_width != GB_get_screen_width(&gb)) {
screen_size_changed();
}
}
static void handle_events(GB_gameboy_t *gb)
{
SDL_Event event;
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_QUIT:
pending_command = GB_SDL_QUIT_COMMAND;
break;
case SDL_DROPFILE: {
set_filename(event.drop.file, SDL_free);
pending_command = GB_SDL_NEW_FILE_COMMAND;
break;
}
case SDL_WINDOWEVENT: {
if (event.window.event == SDL_WINDOWEVENT_SIZE_CHANGED) {
update_viewport();
}
break;
}
case SDL_JOYBUTTONUP:
case SDL_JOYBUTTONDOWN: {
joypad_button_t button = get_joypad_button(event.jbutton.button);
if ((GB_key_t) button < GB_KEY_MAX) {
GB_set_key_state(gb, (GB_key_t) button, event.type == SDL_JOYBUTTONDOWN);
}
else if (button == JOYPAD_BUTTON_TURBO) {
GB_audio_clear_queue();
turbo_down = event.type == SDL_JOYBUTTONDOWN;
GB_set_turbo_mode(gb, turbo_down, turbo_down && rewind_down);
}
else if (button == JOYPAD_BUTTON_SLOW_MOTION) {
underclock_down = event.type == SDL_JOYBUTTONDOWN;
}
else if (button == JOYPAD_BUTTON_REWIND) {
rewind_down = event.type == SDL_JOYBUTTONDOWN;
if (event.type == SDL_JOYBUTTONUP) {
rewind_paused = false;
}
GB_set_turbo_mode(gb, turbo_down, turbo_down && rewind_down);
}
else if (button == JOYPAD_BUTTON_MENU && event.type == SDL_JOYBUTTONDOWN) {
open_menu();
}
}
break;
case SDL_JOYAXISMOTION: {
static bool axis_active[2] = {false, false};
joypad_axis_t axis = get_joypad_axis(event.jaxis.axis);
if (axis == JOYPAD_AXISES_X) {
if (event.jaxis.value > JOYSTICK_HIGH) {
axis_active[0] = true;
GB_set_key_state(gb, GB_KEY_RIGHT, true);
GB_set_key_state(gb, GB_KEY_LEFT, false);
}
else if (event.jaxis.value < -JOYSTICK_HIGH) {
axis_active[0] = true;
GB_set_key_state(gb, GB_KEY_RIGHT, false);
GB_set_key_state(gb, GB_KEY_LEFT, true);
}
else if (axis_active[0] && event.jaxis.value < JOYSTICK_LOW && event.jaxis.value > -JOYSTICK_LOW) {
axis_active[0] = false;
GB_set_key_state(gb, GB_KEY_RIGHT, false);
GB_set_key_state(gb, GB_KEY_LEFT, false);
}
}
else if (axis == JOYPAD_AXISES_Y) {
if (event.jaxis.value > JOYSTICK_HIGH) {
axis_active[1] = true;
GB_set_key_state(gb, GB_KEY_DOWN, true);
GB_set_key_state(gb, GB_KEY_UP, false);
}
else if (event.jaxis.value < -JOYSTICK_HIGH) {
axis_active[1] = true;
GB_set_key_state(gb, GB_KEY_DOWN, false);
GB_set_key_state(gb, GB_KEY_UP, true);
}
else if (axis_active[1] && event.jaxis.value < JOYSTICK_LOW && event.jaxis.value > -JOYSTICK_LOW) {
axis_active[1] = false;
GB_set_key_state(gb, GB_KEY_DOWN, false);
GB_set_key_state(gb, GB_KEY_UP, false);
}
}
}
break;
case SDL_JOYHATMOTION:
{
uint8_t value = event.jhat.value;
int8_t updown =
value == SDL_HAT_LEFTUP || value == SDL_HAT_UP || value == SDL_HAT_RIGHTUP ? -1 : (value == SDL_HAT_LEFTDOWN || value == SDL_HAT_DOWN || value == SDL_HAT_RIGHTDOWN ? 1 : 0);
int8_t leftright =
value == SDL_HAT_LEFTUP || value == SDL_HAT_LEFT || value == SDL_HAT_LEFTDOWN ? -1 : (value == SDL_HAT_RIGHTUP || value == SDL_HAT_RIGHT || value == SDL_HAT_RIGHTDOWN ? 1 : 0);
GB_set_key_state(gb, GB_KEY_LEFT, leftright == -1);
GB_set_key_state(gb, GB_KEY_RIGHT, leftright == 1);
GB_set_key_state(gb, GB_KEY_UP, updown == -1);
GB_set_key_state(gb, GB_KEY_DOWN, updown == 1);
break;
};
case SDL_KEYDOWN:
switch (event_hotkey_code(&event)) {
case SDL_SCANCODE_ESCAPE: {
open_menu();
break;
}
case SDL_SCANCODE_C:
if (event.type == SDL_KEYDOWN && (event.key.keysym.mod & KMOD_CTRL)) {
GB_debugger_break(gb);
}
break;
case SDL_SCANCODE_R:
if (event.key.keysym.mod & MODIFIER) {
pending_command = GB_SDL_RESET_COMMAND;
}
break;
case SDL_SCANCODE_O: {
if (event.key.keysym.mod & MODIFIER) {
char *filename = do_open_rom_dialog();
if (filename) {
set_filename(filename, free);
pending_command = GB_SDL_NEW_FILE_COMMAND;
}
}
break;
}
case SDL_SCANCODE_P:
if (event.key.keysym.mod & MODIFIER) {
paused = !paused;
}
break;
case SDL_SCANCODE_M:
if (event.key.keysym.mod & MODIFIER) {
#ifdef __APPLE__
// Can't override CMD+M (Minimize) in SDL
if (!(event.key.keysym.mod & KMOD_SHIFT)) {
break;
}
#endif
GB_audio_set_paused(GB_audio_is_playing());
}
break;
case SDL_SCANCODE_F:
if (event.key.keysym.mod & MODIFIER) {
if ((SDL_GetWindowFlags(window) & SDL_WINDOW_FULLSCREEN_DESKTOP) == false) {
SDL_SetWindowFullscreen(window, SDL_WINDOW_FULLSCREEN_DESKTOP);
}
else {
SDL_SetWindowFullscreen(window, 0);
}
update_viewport();
}
break;
default:
/* Save states */
if (event.key.keysym.scancode >= SDL_SCANCODE_1 && event.key.keysym.scancode <= SDL_SCANCODE_0) {
if (event.key.keysym.mod & MODIFIER) {
command_parameter = (event.key.keysym.scancode - SDL_SCANCODE_1 + 1) % 10;
if (event.key.keysym.mod & KMOD_SHIFT) {
pending_command = GB_SDL_LOAD_STATE_COMMAND;
}
else {
pending_command = GB_SDL_SAVE_STATE_COMMAND;
}
}
}
break;
}
case SDL_KEYUP: // Fallthrough
if (event.key.keysym.scancode == configuration.keys[8]) {
turbo_down = event.type == SDL_KEYDOWN;
GB_audio_clear_queue();
GB_set_turbo_mode(gb, turbo_down, turbo_down && rewind_down);
}
else if (event.key.keysym.scancode == configuration.keys_2[0]) {
rewind_down = event.type == SDL_KEYDOWN;
if (event.type == SDL_KEYUP) {
rewind_paused = false;
}
GB_set_turbo_mode(gb, turbo_down, turbo_down && rewind_down);
}
else if (event.key.keysym.scancode == configuration.keys_2[1]) {
underclock_down = event.type == SDL_KEYDOWN;
}
else {
for (unsigned i = 0; i < GB_KEY_MAX; i++) {
if (event.key.keysym.scancode == configuration.keys[i]) {
GB_set_key_state(gb, i, event.type == SDL_KEYDOWN);
}
}
}
break;
default:
break;
}
}
}
static void vblank(GB_gameboy_t *gb)
{
if (underclock_down && clock_mutliplier > 0.5) {
clock_mutliplier -= 1.0/16;
GB_set_clock_multiplier(gb, clock_mutliplier);
}
else if (!underclock_down && clock_mutliplier < 1.0) {
clock_mutliplier += 1.0/16;
GB_set_clock_multiplier(gb, clock_mutliplier);
}
if (configuration.blending_mode) {
render_texture(active_pixel_buffer, previous_pixel_buffer);
uint32_t *temp = active_pixel_buffer;
active_pixel_buffer = previous_pixel_buffer;
previous_pixel_buffer = temp;
GB_set_pixels_output(gb, active_pixel_buffer);
}
else {
render_texture(active_pixel_buffer, NULL);
}
do_rewind = rewind_down;
handle_events(gb);
}
static uint32_t rgb_encode(GB_gameboy_t *gb, uint8_t r, uint8_t g, uint8_t b)
{
return SDL_MapRGB(pixel_format, r, g, b);
}
static void rumble(GB_gameboy_t *gb, double amp)
{
SDL_HapticRumblePlay(haptic, amp, 250);
}
static void debugger_interrupt(int ignore)
{
if (!GB_is_inited(&gb)) return;
/* ^C twice to exit */
if (GB_debugger_is_stopped(&gb)) {
GB_save_battery(&gb, battery_save_path_ptr);
exit(0);
}
GB_debugger_break(&gb);
}
static void gb_audio_callback(GB_gameboy_t *gb, GB_sample_t *sample)
{
if (turbo_down) {
static unsigned skip = 0;
skip++;
if (skip == GB_audio_get_frequency() / 8) {
skip = 0;
}
if (skip > GB_audio_get_frequency() / 16) {
return;
}
}
if (GB_audio_get_queue_length() / sizeof(*sample) > GB_audio_get_frequency() / 4) {
return;
}
if (configuration.volume != 100) {
sample->left = sample->left * configuration.volume / 100;
sample->right = sample->right * configuration.volume / 100;
}
GB_audio_queue_sample(sample);
}
static bool handle_pending_command(void)
{
switch (pending_command) {
case GB_SDL_LOAD_STATE_COMMAND:
case GB_SDL_SAVE_STATE_COMMAND: {
char save_path[strlen(filename) + 4];
char save_extension[] = ".s0";
save_extension[2] += command_parameter;
replace_extension(filename, strlen(filename), save_path, save_extension);
start_capturing_logs();
if (pending_command == GB_SDL_LOAD_STATE_COMMAND) {
GB_load_state(&gb, save_path);
}
else {
GB_save_state(&gb, save_path);
}
end_capturing_logs(true, false);
return false;
}
case GB_SDL_NO_COMMAND:
return false;
case GB_SDL_RESET_COMMAND:
case GB_SDL_NEW_FILE_COMMAND:
GB_save_battery(&gb, battery_save_path_ptr);
return true;
case GB_SDL_QUIT_COMMAND:
GB_save_battery(&gb, battery_save_path_ptr);
exit(0);
}
return false;
}
static void load_boot_rom(GB_gameboy_t *gb, GB_boot_rom_t type)
{
static const char *const names[] = {
[GB_BOOT_ROM_DMG0] = "dmg0_boot.bin",
[GB_BOOT_ROM_DMG] = "dmg_boot.bin",
[GB_BOOT_ROM_MGB] = "mgb_boot.bin",
[GB_BOOT_ROM_SGB] = "sgb_boot.bin",
[GB_BOOT_ROM_SGB2] = "sgb2_boot.bin",
[GB_BOOT_ROM_CGB0] = "cgb0_boot.bin",
[GB_BOOT_ROM_CGB] = "cgb_boot.bin",
[GB_BOOT_ROM_AGB] = "agb_boot.bin",
};
bool use_built_in = true;
if (configuration.bootrom_path[0]) {
static char path[4096];
snprintf(path, sizeof(path), "%s/%s", configuration.bootrom_path, names[type]);
use_built_in = GB_load_boot_rom(gb, path);
}
if (use_built_in) {
start_capturing_logs();
GB_load_boot_rom(gb, resource_path(names[type]));
end_capturing_logs(true, false);
}
}
static void run(void)
{
SDL_ShowCursor(SDL_DISABLE);
GB_model_t model;
pending_command = GB_SDL_NO_COMMAND;
restart:
model = (GB_model_t [])
{
[MODEL_DMG] = GB_MODEL_DMG_B,
[MODEL_CGB] = GB_MODEL_CGB_E,
[MODEL_AGB] = GB_MODEL_AGB,
[MODEL_SGB] = (GB_model_t [])
{
[SGB_NTSC] = GB_MODEL_SGB_NTSC,
[SGB_PAL] = GB_MODEL_SGB_PAL,
[SGB_2] = GB_MODEL_SGB2,
}[configuration.sgb_revision],
}[configuration.model];
if (GB_is_inited(&gb)) {
GB_switch_model_and_reset(&gb, model);
}
else {
GB_init(&gb, model);
GB_set_boot_rom_load_callback(&gb, load_boot_rom);
GB_set_vblank_callback(&gb, (GB_vblank_callback_t) vblank);
GB_set_pixels_output(&gb, active_pixel_buffer);
GB_set_rgb_encode_callback(&gb, rgb_encode);
GB_set_rumble_callback(&gb, rumble);
GB_set_rumble_mode(&gb, configuration.rumble_mode);
GB_set_sample_rate(&gb, GB_audio_get_frequency());
GB_set_color_correction_mode(&gb, configuration.color_correction_mode);
GB_set_light_temperature(&gb, (configuration.color_temperature - 10.0) / 10.0);
GB_set_interference_volume(&gb, configuration.interference_volume / 100.0);
update_palette();
if ((unsigned)configuration.border_mode <= GB_BORDER_ALWAYS) {
GB_set_border_mode(&gb, configuration.border_mode);
}
GB_set_highpass_filter_mode(&gb, configuration.highpass_mode);
GB_set_rewind_length(&gb, configuration.rewind_length);
GB_set_rtc_mode(&gb, configuration.rtc_mode);
GB_set_update_input_hint_callback(&gb, handle_events);
GB_apu_set_sample_callback(&gb, gb_audio_callback);
}
bool error = false;
GB_debugger_clear_symbols(&gb);
start_capturing_logs();
size_t path_length = strlen(filename);
char extension[4] = {0,};
if (path_length > 4) {
if (filename[path_length - 4] == '.') {
extension[0] = tolower((unsigned char)filename[path_length - 3]);
extension[1] = tolower((unsigned char)filename[path_length - 2]);
extension[2] = tolower((unsigned char)filename[path_length - 1]);
}
}
if (strcmp(extension, "isx") == 0) {
error = GB_load_isx(&gb, filename);
/* Configure battery */
char battery_save_path[path_length + 5]; /* At the worst case, size is strlen(path) + 4 bytes for .sav + NULL */
replace_extension(filename, path_length, battery_save_path, ".ram");
battery_save_path_ptr = battery_save_path;
GB_load_battery(&gb, battery_save_path);
}
else {
GB_load_rom(&gb, filename);
}
end_capturing_logs(true, error);
/* Configure battery */
char battery_save_path[path_length + 5]; /* At the worst case, size is strlen(path) + 4 bytes for .sav + NULL */
replace_extension(filename, path_length, battery_save_path, ".sav");
battery_save_path_ptr = battery_save_path;
GB_load_battery(&gb, battery_save_path);
/* Configure symbols */
GB_debugger_load_symbol_file(&gb, resource_path("registers.sym"));
char symbols_path[path_length + 5];
replace_extension(filename, path_length, symbols_path, ".sym");
GB_debugger_load_symbol_file(&gb, symbols_path);
screen_size_changed();
/* Run emulation */
while (true) {
if (paused || rewind_paused) {
SDL_WaitEvent(NULL);
handle_events(&gb);
}
else {
if (do_rewind) {
GB_rewind_pop(&gb);
if (turbo_down) {
GB_rewind_pop(&gb);
}
if (!GB_rewind_pop(&gb)) {
rewind_paused = true;
}
do_rewind = false;
}
GB_run(&gb);
}
/* These commands can't run in the handle_event function, because they're not safe in a vblank context. */
if (handle_pending_command()) {
pending_command = GB_SDL_NO_COMMAND;
goto restart;
}
pending_command = GB_SDL_NO_COMMAND;
}
}
static char prefs_path[1024] = {0, };
static void save_configuration(void)
{
FILE *prefs_file = fopen(prefs_path, "wb");
if (prefs_file) {
fwrite(&configuration, 1, sizeof(configuration), prefs_file);
fclose(prefs_file);
}
}
static bool get_arg_flag(const char *flag, int *argc, char **argv)
{
for (unsigned i = 1; i < *argc; i++) {
if (strcmp(argv[i], flag) == 0) {
(*argc)--;
argv[i] = argv[*argc];
return true;
}
}
return false;
}
int main(int argc, char **argv)
{
#ifdef _WIN32
SetProcessDPIAware();
#endif
#define str(x) #x
#define xstr(x) str(x)
fprintf(stderr, "SameBoy v" xstr(VERSION) "\n");
bool fullscreen = get_arg_flag("--fullscreen", &argc, argv);
if (argc > 2) {
fprintf(stderr, "Usage: %s [--fullscreen] [rom]\n", argv[0]);
exit(1);
}
if (argc == 2) {
filename = argv[1];
}
signal(SIGINT, debugger_interrupt);
SDL_Init(SDL_INIT_EVERYTHING);
strcpy(prefs_path, resource_path("prefs.bin"));
if (access(prefs_path, R_OK | W_OK) != 0) {
char *prefs_dir = SDL_GetPrefPath("", "SameBoy");
snprintf(prefs_path, sizeof(prefs_path) - 1, "%sprefs.bin", prefs_dir);
SDL_free(prefs_dir);
}
FILE *prefs_file = fopen(prefs_path, "rb");
if (prefs_file) {
fread(&configuration, 1, sizeof(configuration), prefs_file);
fclose(prefs_file);
/* Sanitize for stability */
configuration.color_correction_mode %= GB_COLOR_CORRECTION_REDUCE_CONTRAST +1;
configuration.scaling_mode %= GB_SDL_SCALING_MAX;
configuration.default_scale %= GB_SDL_DEFAULT_SCALE_MAX + 1;
configuration.blending_mode %= GB_FRAME_BLENDING_MODE_ACCURATE + 1;
configuration.highpass_mode %= GB_HIGHPASS_MAX;
configuration.model %= MODEL_MAX;
configuration.sgb_revision %= SGB_MAX;
configuration.dmg_palette %= 3;
configuration.border_mode %= GB_BORDER_ALWAYS + 1;
configuration.rumble_mode %= GB_RUMBLE_ALL_GAMES + 1;
configuration.color_temperature %= 21;
configuration.bootrom_path[sizeof(configuration.bootrom_path) - 1] = 0;
}
if (configuration.model >= MODEL_MAX) {
configuration.model = MODEL_CGB;
}
if (configuration.default_scale == 0) {
configuration.default_scale = 2;
}
atexit(save_configuration);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
window = SDL_CreateWindow("SameBoy v" xstr(VERSION), SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
160 * configuration.default_scale, 144 * configuration.default_scale, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
if (window == NULL) {
fputs(SDL_GetError(), stderr);
exit(1);
}
SDL_SetWindowMinimumSize(window, 160, 144);
if (fullscreen) {
SDL_SetWindowFullscreen(window, SDL_WINDOW_FULLSCREEN_DESKTOP);
}
SDL_GLContext gl_context = SDL_GL_CreateContext(window);
GLint major = 0, minor = 0;
glGetIntegerv(GL_MAJOR_VERSION, &major);
glGetIntegerv(GL_MINOR_VERSION, &minor);
if (major * 0x100 + minor < 0x302) {
SDL_GL_DeleteContext(gl_context);
gl_context = NULL;
}
if (gl_context == NULL) {
renderer = SDL_CreateRenderer(window, -1, 0);
texture = SDL_CreateTexture(renderer, SDL_GetWindowPixelFormat(window), SDL_TEXTUREACCESS_STREAMING, 160, 144);
pixel_format = SDL_AllocFormat(SDL_GetWindowPixelFormat(window));
}
else {
pixel_format = SDL_AllocFormat(SDL_PIXELFORMAT_ABGR8888);
}
GB_audio_init();
SDL_EventState(SDL_DROPFILE, SDL_ENABLE);
if (!init_shader_with_name(&shader, configuration.filter)) {
init_shader_with_name(&shader, "NearestNeighbor");
}
update_viewport();
if (filename == NULL) {
run_gui(false);
}
else {
connect_joypad();
}
GB_audio_set_paused(false);
run(); // Never returns
return 0;
}
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