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gpsp/libretro.c

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C
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#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include "common.h"
#include "libco.h"
#include "libretro.h"
#include "memmap.h"
#if defined(_3DS) && defined(HAVE_DYNAREC)
int32_t hbInit(void);
void hbExit(void);
int32_t HB_FlushInvalidateCache(void);
int32_t HB_ReprotectMemory(void* addr, uint32_t pages, uint32_t mode, uint32_t* reprotectedPages);
int hb_service_available;
#endif
#ifndef MAX_PATH
#define MAX_PATH (512)
#endif
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;
int dynarec_enable;
u32 idle_loop_target_pc = 0xFFFFFFFF;
u32 iwram_stack_optimize = 1;
u32 translation_gate_target_pc[MAX_TRANSLATION_GATES];
u32 translation_gate_targets = 0;
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)
{
#ifdef HAVE_DYNAREC
if (dynarec_enable)
execute_arm_translate(execute_cycles);
#endif
execute_arm(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);
}
#ifdef PERF_TEST
extern struct retro_perf_callback perf_cb;
#define RETRO_PERFORMANCE_INIT(X) \
static struct retro_perf_counter X = {#X}; \
do { \
if (!(X).registered) \
perf_cb.perf_register(&(X)); \
} while(0)
#define RETRO_PERFORMANCE_START(X) perf_cb.perf_start(&(X))
#define RETRO_PERFORMANCE_STOP(X) perf_cb.perf_stop(&(X))
#else
#define RETRO_PERFORMANCE_INIT(X)
#define RETRO_PERFORMANCE_START(X)
#define RETRO_PERFORMANCE_STOP(X)
#endif
void retro_get_system_info(struct retro_system_info* info)
{
info->library_name = "gpSP";
info->library_version = "v0.91";
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;
// 59.72750057 hz
info->timing.fps = ((float) GBC_BASE_RATE) / (308 * 228 * 4);
info->timing.sample_rate = GBA_SOUND_FREQUENCY;
}
void retro_init(void)
{
init_gamepak_buffer();
init_sound(1);
#if defined(_3DS) && defined(HAVE_DYNAREC)
hb_service_available = !hbInit();
if (hb_service_available)
{
HB_ReprotectMemory(rom_translation_cache,
ROM_TRANSLATION_CACHE_SIZE / 0x1000, 0b111, NULL);
HB_ReprotectMemory(ram_translation_cache,
RAM_TRANSLATION_CACHE_SIZE / 0x1000, 0b111, NULL);
HB_ReprotectMemory(bios_translation_cache,
BIOS_TRANSLATION_CACHE_SIZE / 0x1000, 0b111, NULL);
HB_FlushInvalidateCache();
}
#endif
}
void retro_deinit(void)
{
perf_cb.perf_log();
memory_term();
#if defined(HAVE_MMAP) && defined(HAVE_DYNAREC)
munmap(rom_translation_cache, ROM_TRANSLATION_CACHE_SIZE);
munmap(ram_translation_cache, RAM_TRANSLATION_CACHE_SIZE);
munmap(bios_translation_cache, BIOS_TRANSLATION_CACHE_SIZE);
#endif
#if defined(_3DS) && defined(HAVE_DYNAREC)
hbExit();
#endif
}
static retro_time_t retro_perf_dummy_get_time_usec() { return 0; }
static retro_perf_tick_t retro_perf_dummy_get_counter() { return 0; }
static uint64_t retro_perf_dummy_get_cpu_features() { return 0; }
static void retro_perf_dummy_log() {}
static void retro_perf_dummy_counter(struct retro_perf_counter *counter) {};
void retro_set_environment(retro_environment_t cb)
{
struct retro_log_callback log;
static const struct retro_variable vars[] = {
#ifdef HAVE_DYNAREC
{ "gpsp_drc", "Dynamic recompiler (restart); enabled|disabled" },
#endif
{ NULL, NULL },
};
environ_cb = cb;
if (environ_cb(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &log))
log_cb = log.log;
else
log_cb = NULL;
perf_cb = (struct retro_perf_callback){
retro_perf_dummy_get_time_usec,
retro_perf_dummy_get_counter,
retro_perf_dummy_get_cpu_features,
retro_perf_dummy_counter,
retro_perf_dummy_counter,
retro_perf_dummy_counter,
retro_perf_dummy_log,
};
environ_cb(RETRO_ENVIRONMENT_GET_PERF_INTERFACE, &perf_cb);
environ_cb(RETRO_ENVIRONMENT_SET_VARIABLES, (void*)vars);
}
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(void)
{
deinit_context_switch();
update_backup();
reset_gba();
init_context_switch();
}
size_t retro_serialize_size(void)
{
return GBA_STATE_MEM_SIZE;
}
bool retro_serialize(void* data, size_t size)
{
if (size != GBA_STATE_MEM_SIZE)
return false;
memset (data,0, GBA_STATE_MEM_SIZE);
gba_save_state(data);
return true;
}
bool retro_unserialize(const void* data, size_t size)
{
if (size != GBA_STATE_MEM_SIZE)
return false;
gba_load_state(data);
return true;
}
void retro_cheat_reset(void)
{
}
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, "[gpSP]: %s\n", text);
}
void info_msg(const char* text)
{
if (log_cb)
log_cb(RETRO_LOG_INFO, "[gpSP]: %s\n", 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);
}
static void check_variables(int started_from_load)
{
#ifdef HAVE_DYNAREC
struct retro_variable var;
var.key = "gpsp_drc";
var.value = NULL;
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
{
if (started_from_load)
{
if (strcmp(var.value, "disabled") == 0)
dynarec_enable = 0;
else if (strcmp(var.value, "enabled") == 0)
dynarec_enable = 1;
}
}
else
dynarec_enable = 1;
#endif
}
bool retro_load_game(const struct retro_game_info* info)
{
check_variables(1);
#if defined(HAVE_DYNAREC)
if (dynarec_enable)
{
#if defined(HAVE_MMAP)
rom_translation_cache = mmap(NULL, ROM_TRANSLATION_CACHE_SIZE,
PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANON | MAP_PRIVATE, -1, 0);
ram_translation_cache = mmap(NULL, RAM_TRANSLATION_CACHE_SIZE,
PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANON | MAP_PRIVATE, -1, 0);
bios_translation_cache = mmap(NULL, BIOS_TRANSLATION_CACHE_SIZE,
PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANON | MAP_PRIVATE, -1, 0);
rom_translation_ptr = rom_translation_cache;
ram_translation_ptr = ram_translation_cache;
bios_translation_ptr = bios_translation_cache;
#elif defined(_3DS)
if(!hb_service_available)
dynarec_enable = 0;
#endif
}
else
dynarec_enable = 0;
#else
dynarec_enable = 0;
#endif
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))
info_msg("RGB565 is not supported.");
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(save_path, dir, sizeof(save_path));
else
strncpy(save_path, main_path, sizeof(save_path));
if (load_bios(filename_bios) != 0)
{
error_msg("Could not load BIOS image file.");
return false;
}
if (bios_rom[0] != 0x18)
{
info_msg("You have an incorrect BIOS image.");
info_msg("While many games will work fine, some will not.");
info_msg("It is strongly recommended that you obtain the correct BIOS file.");
}
gamepak_filename[0] = 0;
if (load_gamepak(info, info->path) != 0)
{
error_msg("Could not load the game file.");
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(void)
{
deinit_context_switch();
update_backup();
}
unsigned retro_get_region(void)
{
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;
}
void retro_run(void)
{
bool updated = false;
input_poll_cb();
switch_to_cpu_thread();
update_input();
render_audio();
video_cb(gba_screen_pixels, GBA_SCREEN_WIDTH, GBA_SCREEN_HEIGHT,
GBA_SCREEN_PITCH * 2);
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
check_variables(0);
}
unsigned retro_api_version(void)
{
return RETRO_API_VERSION;
}
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