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bsnes
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bsnes/SDL/main.c

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#include <stdbool.h>
#include <signal.h>
#include <SDL2/SDL.h>
#include "gb.h"
#include "utils.h"
#ifndef _WIN32
#define AUDIO_FREQUENCY 96000
#else
/* Windows (well, at least my VM) can't handle 96KHz sound well :( */
#define AUDIO_FREQUENCY 44100
#endif
#ifdef __APPLE__
#define MODIFIER_NAME "Cmd"
#else
#define MODIFIER_NAME "Ctrl"
#endif
static const char help[] =
"Drop a GB or GBC ROM file to play.\n"
"\n"
"Controls:\n"
" D-Pad: Arrow Keys\n"
" A: X\n"
" B: Z\n"
" Start: Enter\n"
" Select: Backspace\n"
"\n"
"Keyboard Shortcuts: \n"
" Restart: " MODIFIER_NAME "+R\n"
" Pause: " MODIFIER_NAME "+P\n"
" Turbo: Space\n"
#ifdef __APPLE__
" Mute/Unmute: " MODIFIER_NAME "+Shift+M\n"
#else
" Mute/Unmute: " MODIFIER_NAME "+M\n"
#endif
" Save state: " MODIFIER_NAME "+Number (0-9)\n"
" Load state: " MODIFIER_NAME "+Shift+Number (0-9)\n"
" Cycle between DMG/CGB emulation: " MODIFIER_NAME "+T\n"
" Cycle scaling modes: Tab"
;
GB_gameboy_t gb;
static bool dmg = false;
static bool paused = false;
static uint32_t pixels[160*144];
static char *filename = NULL;
static bool should_free_filename = false;
static char *battery_save_path_ptr;
static SDL_Window *window = NULL;
static SDL_Renderer *renderer = NULL;
static SDL_Texture *texture = NULL;
static SDL_PixelFormat *pixel_format = NULL;
static SDL_AudioSpec want_aspec, have_aspec;
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 enum {
GB_SDL_NO_COMMAND,
GB_SDL_SAVE_STATE_COMMAND,
GB_SDL_LOAD_STATE_COMMAND,
GB_SDL_RESET_COMMAND,
GB_SDL_NEW_FILE_COMMAND,
GB_SDL_TOGGLE_MODEL_COMMAND,
} pending_command;
static enum {
GB_SDL_SCALING_ENTIRE_WINDOW,
GB_SDL_SCALING_KEEP_RATIO,
GB_SDL_SCALING_INTEGER_FACTOR,
GB_SDL_SCALING_MAX,
} scaling_mode = GB_SDL_SCALING_INTEGER_FACTOR;
static unsigned command_parameter;
static void update_viewport(void)
{
int win_width, win_height;
SDL_GetWindowSize(window, &win_width, &win_height);
double x_factor = win_width / 160.0;
double y_factor = win_height / 144.0;
if (scaling_mode == GB_SDL_SCALING_INTEGER_FACTOR) {
x_factor = (int)(x_factor);
y_factor = (int)(y_factor);
}
if (scaling_mode != GB_SDL_SCALING_ENTIRE_WINDOW) {
if (x_factor > y_factor) {
x_factor = y_factor;
}
else {
y_factor = x_factor;
}
}
unsigned new_width = x_factor * 160;
unsigned new_height = y_factor * 144;
SDL_Rect rect = (SDL_Rect){(win_width - new_width) / 2, (win_height - new_height) /2,
new_width, new_height};
SDL_RenderSetViewport(renderer, &rect);
}
static void cycle_scaling(void)
{
scaling_mode++;
scaling_mode %= GB_SDL_SCALING_MAX;
update_viewport();
SDL_RenderClear(renderer);
SDL_RenderCopy(renderer, texture, NULL, NULL);
SDL_RenderPresent(renderer);
}
static void handle_events(GB_gameboy_t *gb)
{
#ifdef __APPLE__
#define MODIFIER KMOD_GUI
#else
#define MODIFIER KMOD_CTRL
#endif
SDL_Event event;
while (SDL_PollEvent(&event))
{
switch (event.type) {
case SDL_QUIT:
GB_save_battery(gb, battery_save_path_ptr);
exit(0);
case SDL_DROPFILE: {
if (should_free_filename) {
SDL_free(filename);
}
filename = event.drop.file;
should_free_filename = true;
pending_command = GB_SDL_NEW_FILE_COMMAND;
break;
}
case SDL_WINDOWEVENT: {
if (event.window.event == SDL_WINDOWEVENT_RESIZED) {
update_viewport();
}
}
case SDL_KEYDOWN:
switch (event.key.keysym.sym) {
case SDLK_c:
if (event.type == SDL_KEYDOWN && (event.key.keysym.mod & KMOD_CTRL)) {
GB_debugger_break(gb);
}
break;
case SDLK_r:
if (event.key.keysym.mod & MODIFIER) {
pending_command = GB_SDL_RESET_COMMAND;
}
break;
case SDLK_t:
if (event.key.keysym.mod & MODIFIER) {
pending_command = GB_SDL_TOGGLE_MODEL_COMMAND;
}
break;
case SDLK_p:
if (event.key.keysym.mod & MODIFIER) {
paused = !paused;
}
break;
case SDLK_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
SDL_PauseAudio(SDL_GetAudioStatus() == SDL_AUDIO_PLAYING? true : false);
}
break;
case SDLK_TAB:
cycle_scaling();
break;
#ifndef __APPLE__
case SDLK_F1:
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_INFORMATION, "Help", help, window);
break;
#else
case SDLK_SLASH:
if (!(event.key.keysym.sym && (event.key.keysym.mod & KMOD_SHIFT))) {
break;
}
case SDLK_QUESTION:
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_INFORMATION, "Help", help, window);
#endif
default:
/* Save states */
if (event.key.keysym.sym >= SDLK_0 && event.key.keysym.sym <= SDLK_9) {
if (event.key.keysym.mod & MODIFIER) {
command_parameter = event.key.keysym.sym - SDLK_0;
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
switch (event.key.keysym.sym) {
case SDLK_RIGHT:
GB_set_key_state(gb, GB_KEY_RIGHT, event.type == SDL_KEYDOWN);
break;
case SDLK_LEFT:
GB_set_key_state(gb, GB_KEY_LEFT, event.type == SDL_KEYDOWN);
break;
case SDLK_UP:
GB_set_key_state(gb, GB_KEY_UP, event.type == SDL_KEYDOWN);
break;
case SDLK_DOWN:
GB_set_key_state(gb, GB_KEY_DOWN, event.type == SDL_KEYDOWN);
break;
case SDLK_x:
GB_set_key_state(gb, GB_KEY_A, event.type == SDL_KEYDOWN);
break;
case SDLK_z:
GB_set_key_state(gb, GB_KEY_B, event.type == SDL_KEYDOWN);
break;
case SDLK_BACKSPACE:
GB_set_key_state(gb, GB_KEY_SELECT, event.type == SDL_KEYDOWN);
break;
case SDLK_RETURN:
GB_set_key_state(gb, GB_KEY_START, event.type == SDL_KEYDOWN);
break;
case SDLK_SPACE:
GB_set_turbo_mode(gb, event.type == SDL_KEYDOWN, false);
break;
}
break;
default:
break;
}
}
}
static void vblank(GB_gameboy_t *gb)
{
SDL_UpdateTexture(texture, NULL, pixels, 160 * sizeof (uint32_t));
SDL_RenderClear(renderer);
SDL_RenderCopy(renderer, texture, NULL, NULL);
SDL_RenderPresent(renderer);
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 debugger_interrupt(int ignore)
{
/* ^C twice to exit */
if (GB_debugger_is_stopped(&gb)) {
exit(0);
}
GB_debugger_break(&gb);
}
static void audio_callback(void *gb, Uint8 *stream, int len)
{
if (GB_is_inited(gb)) {
GB_apu_copy_buffer(gb, (GB_sample_t *) stream, len / sizeof(GB_sample_t));
}
else {
memset(stream, 0, len);
}
}
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_RESET_COMMAND:
GB_reset(&gb);
return false;
case GB_SDL_NO_COMMAND:
return false;
case GB_SDL_NEW_FILE_COMMAND:
return true;
case GB_SDL_TOGGLE_MODEL_COMMAND:
dmg = !dmg;
return true;
}
return false;
}
static void run(void)
{
restart:
if (GB_is_inited(&gb)) {
GB_switch_model_and_reset(&gb, !dmg);
}
else {
if (dmg) {
GB_init(&gb);
}
else {
GB_init_cgb(&gb);
}
GB_set_vblank_callback(&gb, (GB_vblank_callback_t) vblank);
GB_set_pixels_output(&gb, pixels);
GB_set_rgb_encode_callback(&gb, rgb_encode);
GB_set_sample_rate(&gb, have_aspec.freq);
}
bool error = false;
start_capturing_logs();
if (dmg) {
error = GB_load_boot_rom(&gb, executable_relative_path("dmg_boot.bin"));
}
else {
error = GB_load_boot_rom(&gb, executable_relative_path("cgb_boot.bin"));
}
end_capturing_logs(true, error);
start_capturing_logs();
error = GB_load_rom(&gb, filename);
end_capturing_logs(true, error);
size_t path_length = strlen(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, ".sav");
battery_save_path_ptr = battery_save_path;
GB_load_battery(&gb, battery_save_path);
/* Configure symbols */
GB_debugger_load_symbol_file(&gb, executable_relative_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);
/* Run emulation */
while (true) {
if (paused) {
SDL_WaitEvent(NULL);
handle_events(&gb);
}
else {
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;
}
}
int main(int argc, char **argv)
{
#define str(x) #x
#define xstr(x) str(x)
fprintf(stderr, "SameBoy v" xstr(VERSION) "\n");
if (argc > 3) {
usage:
fprintf(stderr, "Usage: %s [--dmg] [rom]\n", argv[0]);
exit(1);
}
for (unsigned i = 1; i < argc; i++) {
if (strcmp(argv[i], "--dmg") == 0) {
if (dmg) {
goto usage;
}
dmg = true;
}
else if (!filename) {
filename = argv[i];
}
else {
goto usage;
}
}
signal(SIGINT, debugger_interrupt);
SDL_Init( SDL_INIT_EVERYTHING );
window = SDL_CreateWindow("SameBoy v" xstr(VERSION), SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
160 * 2, 144 * 2, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
SDL_SetWindowMinimumSize(window, 160, 144);
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));
/* Configure Audio */
memset(&want_aspec, 0, sizeof(want_aspec));
want_aspec.freq = AUDIO_FREQUENCY;
want_aspec.format = AUDIO_S16SYS;
want_aspec.channels = 2;
#if SDL_COMPILEDVERSION == 2005 && defined(__APPLE__)
/* SDL 2.0.5 on macOS introduced a bug where certain combinations of buffer lengths and frequencies
fail to produce audio correctly. This bug was fixed 2.0.6. */
want_aspec.samples = 2048;
#else
want_aspec.samples = 512;
#endif
want_aspec.callback = audio_callback;
want_aspec.userdata = &gb;
SDL_OpenAudio(&want_aspec, &have_aspec);
/* Start Audio */
SDL_PauseAudio(false);
SDL_EventState(SDL_DROPFILE, SDL_ENABLE);
if (filename == NULL) {
/* Draw the "Drop file" screen */
SDL_Surface *drop_backround = SDL_LoadBMP(executable_relative_path("drop.bmp"));
SDL_Surface *drop_converted = SDL_ConvertSurface(drop_backround, pixel_format, 0);
SDL_LockSurface(drop_converted);
SDL_UpdateTexture(texture, NULL, drop_converted->pixels, drop_converted->pitch);
SDL_RenderClear(renderer);
SDL_RenderCopy(renderer, texture, NULL, NULL);
SDL_RenderPresent(renderer);
SDL_FreeSurface(drop_converted);
SDL_FreeSurface(drop_backround);
SDL_Event event;
while (SDL_WaitEvent(&event))
{
switch (event.type) {
case SDL_QUIT: {
exit(0);
}
case SDL_WINDOWEVENT: {
if (event.window.event == SDL_WINDOWEVENT_RESIZED) {
update_viewport();
SDL_RenderClear(renderer);
SDL_RenderCopy(renderer, texture, NULL, NULL);
SDL_RenderPresent(renderer);
}
break;
}
case SDL_DROPFILE: {
filename = event.drop.file;
should_free_filename = true;
goto start;
}
case SDL_KEYDOWN:
if (event.key.keysym.sym == SDLK_TAB) {
cycle_scaling();
}
#ifndef __APPLE__
else if (event.key.keysym.sym == SDLK_F1) {
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_INFORMATION, "Help", help, window);
}
#else
else if (event.key.keysym.sym == SDLK_QUESTION || (event.key.keysym.sym && (event.key.keysym.mod & KMOD_SHIFT))) {
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_INFORMATION, "Help", help, window);
}
#endif
break;
}
}
}
start:
run(); // Never returns
return 0;
}
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