diff options
Diffstat (limited to 'libretro.c')
| -rw-r--r-- | libretro.c | 291 |
1 files changed, 291 insertions, 0 deletions
diff --git a/libretro.c b/libretro.c new file mode 100644 index 0000000..56a4ccf --- /dev/null +++ b/libretro.c @@ -0,0 +1,291 @@ + + +#include <stdio.h> +#include <string.h> +#include <stdint.h> +#include "common.h" +#include "libco.h" + +static retro_log_printf_t log_cb; +static retro_video_refresh_t video_cb; +static retro_input_poll_t input_poll_cb; +static retro_environment_t environ_cb; + +struct retro_perf_callback perf_cb; + +static cothread_t main_thread; +static cothread_t cpu_thread; + +void switch_to_main_thread(void) +{ + co_switch(main_thread); +} + +static inline void switch_to_cpu_thread(void) +{ + co_switch(cpu_thread); +} + +static void cpu_thread_entry(void) +{ + execute_arm_translate(reg[EXECUTE_CYCLES]); +} + +static inline void init_context_switch(void) +{ + main_thread = co_active(); + cpu_thread = co_create(0x20000, cpu_thread_entry); +} + +static inline void deinit_context_switch(void) +{ + co_delete(cpu_thread); +} + +void retro_get_system_info(struct retro_system_info *info) +{ + info->library_name = "TempGBA"; + info->library_version = "v0.0.1"; + info->need_fullpath = true; + info->block_extract = false; + info->valid_extensions = "gba|bin|agb|gbz" ; +} + + +void retro_get_system_av_info(struct retro_system_av_info *info) +{ + info->geometry.base_width = GBA_SCREEN_WIDTH; + info->geometry.base_height = GBA_SCREEN_HEIGHT; + info->geometry.max_width = GBA_SCREEN_WIDTH; + info->geometry.max_height = GBA_SCREEN_HEIGHT; + info->geometry.aspect_ratio = 0; + info->timing.fps = ((float) CPU_FREQUENCY) / (308 * 228 * 4); // 59.72750057 hz + info->timing.sample_rate = SOUND_FREQUENCY; +// info->timing.sample_rate = 32 * 1024; +} + + +void retro_init() +{ + init_gamepak_buffer(); + init_sound(); +} + +void retro_deinit() +{ + perf_cb.perf_log(); + quit_gba(); +} + +void retro_set_environment(retro_environment_t cb) +{ + struct retro_log_callback log; + + environ_cb = cb; + + if (environ_cb(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &log)) + log_cb = log.log; + else + log_cb = NULL; + + environ_cb(RETRO_ENVIRONMENT_GET_PERF_INTERFACE, &perf_cb); + +} + +void retro_set_video_refresh(retro_video_refresh_t cb) { video_cb = cb; } +void retro_set_input_poll(retro_input_poll_t cb) { input_poll_cb = cb; } + +void retro_set_controller_port_device(unsigned port, unsigned device) {} + +void retro_reset() +{ + deinit_context_switch(); + + update_backup(); + reset_gba(); + + init_context_switch(); +} + + +size_t retro_serialize_size() +{ + return SAVESTATE_SIZE; +} + +bool retro_serialize(void *data, size_t size) +{ + if (size < SAVESTATE_SIZE) + return false; + + gba_save_state(data); + + return true; +} + +bool retro_unserialize(const void *data, size_t size) +{ + if (size < SAVESTATE_SIZE) + return false; + + gba_load_state(data); + + return true; +} + +void retro_cheat_reset() {} +void retro_cheat_set(unsigned index, bool enabled, const char *code) {} + +void error_msg(const char *text) +{ + if (log_cb) + log_cb(RETRO_LOG_ERROR, text); +} + +void info_msg(const char *text) +{ + if (log_cb) + log_cb(RETRO_LOG_INFO, text); +} + +static void extract_directory(char *buf, const char *path, size_t size) +{ + strncpy(buf, path, size - 1); + buf[size - 1] = '\0'; + + char *base = strrchr(buf, '/'); + + if (base) + *base = '\0'; + else + strncpy(buf, ".", size); +} + +bool retro_load_game(const struct retro_game_info *info) +{ + char filename_bios[MAX_PATH]; + const char *dir = NULL; + + enum retro_pixel_format fmt = RETRO_PIXEL_FORMAT_RGB565; + if (!environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt)) + { + if (log_cb) + log_cb(RETRO_LOG_INFO, "[TempGBA]: 0RGB1555 is not supported.\n"); + return false; + } + + extract_directory(main_path,info->path,sizeof(main_path)); + + if (environ_cb(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &dir) && dir) + strncpy(filename_bios, dir, sizeof(filename_bios)); + else + strncpy(filename_bios, main_path, sizeof(filename_bios)); + + strncat(filename_bios, "/gba_bios.bin",sizeof(filename_bios)); + + + if (environ_cb(RETRO_ENVIRONMENT_GET_SAVE_DIRECTORY, &dir) && dir) + strncpy(dir_save, dir, sizeof(dir_save)); + else + strncpy(dir_save, main_path, sizeof(dir_save)); + + strncat(dir_save, "/",sizeof(dir_save)); + + strncat(main_path, "/",sizeof(main_path)); + + if (load_bios(filename_bios) < 0) + { + error_msg("Could not load BIOS image file.\n"); + return false; + } + + gamepak_filename[0] = 0; + + if (load_gamepak(info->path) < 0) + { + error_msg("Could not load the game file.\n"); + return false; + } + + reset_gba(); + + init_context_switch(); + + return true; +} + + +bool retro_load_game_special(unsigned game_type, const struct retro_game_info *info, size_t num_info) +{ return false; } + +void retro_unload_game() +{ + deinit_context_switch(); + update_backup(); +} + +unsigned retro_get_region() { return RETRO_REGION_NTSC; } + +void *retro_get_memory_data(unsigned id) +{ +// switch (id) +// { +// case RETRO_MEMORY_SAVE_RAM: +// return gamepak_backup; +// } + + return 0; +} + +size_t retro_get_memory_size(unsigned id) +{ +// switch (id) +// { +// case RETRO_MEMORY_SAVE_RAM: +// switch(backup_type) +// { +// case BACKUP_SRAM: +// return sram_size; + +// case BACKUP_FLASH: +// return flash_size; + +// case BACKUP_EEPROM: +// return eeprom_size; + +// case BACKUP_NONE: +// return 0x0; + +// default: +// return 0x8000; +// } +// } + + return 0; +} + +static void check_variables(void) +{ + +} + +void retro_run() +{ + bool updated = false; + + input_poll_cb(); + + switch_to_cpu_thread(); + + update_input(); + + render_audio(); + + video_cb(GBA_FRAME_TEXTURE, GBA_SCREEN_WIDTH, GBA_SCREEN_HEIGHT, 512); + + if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated) + check_variables(); + +} + +unsigned retro_api_version() { return RETRO_API_VERSION; } |