SameBoy/libretro/libretro.c

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C
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#include <stdio.h>
#include <stdbool.h>
#include <unistd.h>
#include <time.h>
#include <assert.h>
#include <signal.h>
#include <stdarg.h>
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#define AUDIO_FREQUENCY 44100
#ifdef _WIN32
#include <direct.h>
#include <windows.h>
#define snprintf _snprintf
#endif
#include "gb.h"
#include "libretro.h"
#ifdef _WIN32
char slash = '\\';
#else
char slash = '/';
#endif
#define VIDEO_WIDTH 160
#define VIDEO_HEIGHT 144
#define VIDEO_PIXELS VIDEO_WIDTH * VIDEO_HEIGHT
char battery_save_path[512];
char symbols_path[512];
static uint32_t *frame_buf;
static struct retro_log_callback logging;
static retro_log_printf_t log_cb;
static retro_video_refresh_t video_cb;
static retro_audio_sample_batch_t audio_batch_cb;
static retro_input_poll_t input_poll_cb;
static retro_input_state_t input_state_cb;
signed short soundbuf[1024*2];
char retro_system_directory[4096];
char retro_save_directory[4096];
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char retro_game_path[4096];
int RLOOP=1;
GB_gameboy_t gb;
static void fallback_log(enum retro_log_level level, const char *fmt, ...)
{
(void)level;
va_list va;
va_start(va, fmt);
vfprintf(stderr, fmt, va);
va_end(va);
}
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static void replace_extension(const char *src, size_t length, char *dest, const char *ext)
{
memcpy(dest, src, length);
dest[length] = 0;
/* Remove extension */
for (size_t i = length; i--;) {
if (dest[i] == '/') break;
if (dest[i] == '.') {
dest[i] = 0;
break;
}
}
/* Add new extension */
strcat(dest, ext);
}
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static void GB_update_keys_status(GB_gameboy_t *gb)
{
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input_poll_cb();
GB_set_key_state(gb, GB_KEY_RIGHT,input_state_cb(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT));
GB_set_key_state(gb, GB_KEY_LEFT, input_state_cb(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT));
GB_set_key_state(gb, GB_KEY_UP,input_state_cb(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP) );
GB_set_key_state(gb, GB_KEY_DOWN,input_state_cb(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN));
GB_set_key_state(gb, GB_KEY_A,input_state_cb(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A) );
GB_set_key_state(gb, GB_KEY_B,input_state_cb(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B) );
GB_set_key_state(gb, GB_KEY_SELECT,input_state_cb(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_SELECT));
GB_set_key_state(gb, GB_KEY_START,input_state_cb(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START) );
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}
static void audio_callback(void *gb)
{
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GB_apu_copy_buffer(gb, (GB_sample_t *) soundbuf, 735);
audio_batch_cb(soundbuf, 735);
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}
static void vblank(GB_gameboy_t *gb)
{
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GB_update_keys_status(gb);
GB_set_pixels_output(gb, frame_buf);
audio_callback(gb);
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}
static uint32_t rgb_encode(GB_gameboy_t *gb, uint8_t r, uint8_t g, uint8_t b)
{
return r<<16|g<<8|b;
}
#ifdef HAVE_DEBUGGER
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static void debugger_interrupt(int ignore)
{
/* ^C twice to exit */
if (GB_debugger_is_stopped(&gb))
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exit(0);
GB_debugger_break(&gb);
}
#endif
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static retro_environment_t environ_cb;
void retro_init(void)
{
frame_buf = (uint32_t*)malloc(VIDEO_PIXELS * sizeof(uint32_t));
const char *dir = NULL;
if (environ_cb(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &dir) && dir)
snprintf(retro_system_directory, sizeof(retro_system_directory), "%s", dir);
else
snprintf(retro_system_directory, sizeof(retro_system_directory), "%s", ".");
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if (environ_cb(RETRO_ENVIRONMENT_GET_SAVE_DIRECTORY, &dir) && dir)
snprintf(retro_save_directory, sizeof(retro_save_directory), "%s", dir);
else
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snprintf(retro_save_directory, sizeof(retro_save_directory), "%s", ".");
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}
void retro_deinit(void)
{
free(frame_buf);
frame_buf = NULL;
}
unsigned retro_api_version(void)
{
return RETRO_API_VERSION;
}
void retro_set_controller_port_device(unsigned port, unsigned device)
{
log_cb(RETRO_LOG_INFO, "Plugging device %u into port %u.\n", device, port);
}
void retro_get_system_info(struct retro_system_info *info)
{
memset(info, 0, sizeof(*info));
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info->library_name = "SameBoy";
info->library_version = "0.8";
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info->need_fullpath = true;
info->valid_extensions = "gb|gbc";
}
void retro_get_system_av_info(struct retro_system_av_info *info)
{
struct retro_game_geometry geom = { VIDEO_WIDTH, VIDEO_HEIGHT,VIDEO_WIDTH, VIDEO_HEIGHT ,160.0 / 144.0 };
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struct retro_system_timing timing = { 59.72, 44100.0 };
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info->geometry = geom;
info->timing = timing;
}
static struct retro_rumble_interface rumble;
void retro_set_environment(retro_environment_t cb)
{
environ_cb = cb;
if (cb(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &logging))
log_cb = logging.log;
else
log_cb = fallback_log;
static const struct retro_controller_description controllers[] = {
{ "Nintendo DS", RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 0) },
};
static const struct retro_controller_info ports[] = {
{ controllers, 1 },
{ NULL, 0 },
};
cb(RETRO_ENVIRONMENT_SET_CONTROLLER_INFO, (void*)ports);
}
void retro_set_audio_sample(retro_audio_sample_t cb)
{
}
void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb)
{
audio_batch_cb = cb;
}
void retro_set_input_poll(retro_input_poll_t cb)
{
input_poll_cb = cb;
}
void retro_set_input_state(retro_input_state_t cb)
{
input_state_cb = cb;
}
void retro_set_video_refresh(retro_video_refresh_t cb)
{
video_cb = cb;
}
void retro_reset(void)
{
}
static void check_variables(void)
{
}
void retro_run(void)
{
bool updated = false;
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
check_variables();
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GB_run_frame(&gb);
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video_cb(frame_buf, VIDEO_WIDTH, VIDEO_HEIGHT, 0);
}
bool retro_load_game(const struct retro_game_info *info)
{
struct retro_input_descriptor desc[] = {
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT, "Left" },
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP, "Up" },
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN, "Down" },
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT, "Right" },
{ 0 },
};
environ_cb(RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS, desc);
enum retro_pixel_format fmt = RETRO_PIXEL_FORMAT_XRGB8888;
if (!environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt))
{
log_cb(RETRO_LOG_INFO, "XRGB8888 is not supported.\n");
return false;
}
snprintf(retro_game_path, sizeof(retro_game_path), "%s", info->path);
check_variables();
char buf[256];
int err = 0;
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if (!strstr(info->path, "gbc"))
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{
GB_init(&gb);
snprintf(buf, sizeof(buf), "%s%cdmg_boot.bin", retro_system_directory, slash);
log_cb(RETRO_LOG_INFO, "Loading boot image: %s\n", buf);
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err = GB_load_boot_rom(&gb, buf);
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if (err)
err = GB_load_boot_rom_dmg(&gb);
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}
else
{
GB_init_cgb(&gb);
snprintf(buf, sizeof(buf), "%s%ccgb_boot.bin", retro_system_directory, slash);
log_cb(RETRO_LOG_INFO, "Loading boot image: %s\n", buf);
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err = GB_load_boot_rom(&gb, buf);
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if (err)
err = GB_load_boot_rom_cgb(&gb);
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}
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if (err)
log_cb(RETRO_LOG_INFO, "Failed to load boot ROM %s %d\n", buf, err);
(void)info;
if (GB_load_rom(&gb,info->path)) {
perror("Failed to load ROM");
exit(1);
}
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GB_set_vblank_callback(&gb, (GB_vblank_callback_t) vblank);
GB_set_user_data(&gb, (void*)NULL);
GB_set_pixels_output(&gb,(unsigned char *) frame_buf);
GB_set_rgb_encode_callback(&gb, rgb_encode);
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size_t path_length = strlen(retro_game_path);
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/* Configure battery */
replace_extension(retro_game_path, path_length, battery_save_path, ".sav");
GB_load_battery(&gb, battery_save_path);
printf("(%s)\n",battery_save_path);
/* Configure symbols */
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#ifdef HAVE_DEBUGGER
{
char TMPC[512];
sprintf(TMPC,"%s/registers.sym",retro_system_directory);
GB_debugger_load_symbol_file(&gb, TMPC);
}
#endif
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replace_extension(retro_game_path, path_length, symbols_path, ".sym");
#ifdef HAVE_DEBUGGER
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GB_debugger_load_symbol_file(&gb, symbols_path);
#endif
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GB_set_sample_rate(&gb, AUDIO_FREQUENCY);
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return true;
}
void retro_unload_game(void)
{
}
unsigned retro_get_region(void)
{
return RETRO_REGION_NTSC;
}
bool retro_load_game_special(unsigned type, const struct retro_game_info *info, size_t num)
{
return false;
}
size_t retro_serialize_size(void)
{
return false;
}
bool retro_serialize(void *data_, size_t size)
{
return false;
}
bool retro_unserialize(const void *data_, size_t size)
{
return false;
}
void *retro_get_memory_data(unsigned id)
{
(void)id;
return NULL;
}
size_t retro_get_memory_size(unsigned id)
{
(void)id;
return 0;
}
void retro_cheat_reset(void)
{}
void retro_cheat_set(unsigned index, bool enabled, const char *code)
{
(void)index;
(void)enabled;
(void)code;
}