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gpsp/libretro.c

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#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include "common.h"
#include "libretro.h"
#include "libretro_core_options.h"
#include "memmap.h"
#include "gba_memory.h"
#include "gba_cc_lut.h"
#if defined(VITA) && defined(HAVE_DYNAREC)
#include <psp2/kernel/sysmem.h>
static int translation_caches_inited = 0;
static inline int align(int x, int n) {
return (((x >> n) + 1) << n );
}
#define FOUR_KB_ALIGN(x) align(x, 12)
#define MB_ALIGN(x) align(x, 20)
int _newlib_vm_size_user = ROM_TRANSLATION_CACHE_SIZE +
RAM_TRANSLATION_CACHE_SIZE;
int getVMBlock();
#endif
#if defined(_3DS)
void* linearMemAlign(size_t size, size_t alignment);
void linearFree(void* mem);
#if defined(HAVE_DYNAREC)
#include <malloc.h>
#include "3ds/3ds_utils.h"
#define MEMOP_PROT 6
#define MEMOP_MAP 4
#define MEMOP_UNMAP 5
int32_t svcDuplicateHandle(uint32_t* out, uint32_t original);
int32_t svcCloseHandle(uint32_t handle);
int32_t svcControlProcessMemory(uint32_t process, void* addr0, void* addr1, uint32_t size, uint32_t type, uint32_t perm);
static int translation_caches_inited = 0;
#endif
#endif
#ifndef MAX_PATH
#define MAX_PATH (512)
#endif
// 59.72750057 hz
#define GBA_FPS ((float) GBC_BASE_RATE) / (308 * 228 * 4)
/* Maximum number of consecutive frames that
* can be skipped */
#define FRAMESKIP_MAX 30
u32 skip_next_frame = 0;
static frameskip_type current_frameskip_type = no_frameskip;
static u32 frameskip_threshold = 0;
static u32 frameskip_interval = 0;
static u32 frameskip_counter = 0;
static bool audio_buff_active = false;
static unsigned audio_buff_occupancy = 0;
static bool audio_buff_underrun = false;
static unsigned audio_latency = 0;
static bool update_audio_latency = false;
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;
int dynarec_enable;
int use_libretro_save_method = 0;
u32 idle_loop_target_pc = 0xFFFFFFFF;
u32 iwram_stack_optimize = 1;
u32 translation_gate_target_pc[MAX_TRANSLATION_GATES];
u32 translation_gate_targets = 0;
static u16 *gba_screen_pixels_prev = NULL;
static u16 *gba_processed_pixels = NULL;
static void (*video_post_process)(void) = NULL;
static bool post_process_cc = false;
static bool post_process_mix = false;
#if defined(PSP)
static uint32_t next_pow2(uint32_t v)
{
v--;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
v++;
return v;
}
#endif
static void error_msg(const char* text)
{
if (log_cb)
log_cb(RETRO_LOG_ERROR, "[gpSP]: %s\n", text);
}
static void info_msg(const char* text)
{
if (log_cb)
log_cb(RETRO_LOG_INFO, "[gpSP]: %s\n", text);
}
/* Frameskip START */
static void audio_buff_status_cb(
bool active, unsigned occupancy, bool underrun_likely)
{
audio_buff_active = active;
audio_buff_occupancy = occupancy;
audio_buff_underrun = underrun_likely;
}
static void init_frameskip(void)
{
if (current_frameskip_type == no_frameskip)
{
environ_cb(RETRO_ENVIRONMENT_SET_AUDIO_BUFFER_STATUS_CALLBACK, NULL);
audio_latency = 0;
}
else
{
bool calculate_audio_latency = true;
if (current_frameskip_type == fixed_interval_frameskip)
environ_cb(RETRO_ENVIRONMENT_SET_AUDIO_BUFFER_STATUS_CALLBACK, NULL);
else
{
struct retro_audio_buffer_status_callback buff_status_cb;
buff_status_cb.callback = audio_buff_status_cb;
if (!environ_cb(RETRO_ENVIRONMENT_SET_AUDIO_BUFFER_STATUS_CALLBACK, &buff_status_cb))
{
error_msg("Frameskip disabled - frontend does not support audio buffer status monitoring");
audio_buff_active = false;
audio_buff_occupancy = 0;
audio_buff_underrun = false;
audio_latency = 0;
calculate_audio_latency = false;
}
}
if (calculate_audio_latency)
{
/* Frameskip is enabled - increase frontend
* audio latency to minimise potential
* buffer underruns */
float frame_time_msec = 1000.0f / ((float) GBA_FPS);
/* Set latency to 6x current frame time... */
audio_latency = (unsigned)((6.0f * frame_time_msec) + 0.5f);
/* ...then round up to nearest multiple of 32 */
audio_latency = (audio_latency + 0x1F) & ~0x1F;
}
}
update_audio_latency = true;
frameskip_counter = 0;
}
/* Frameskip END */
/* Video post processing START */
/* Note: This code is intentionally W.E.T.
* (Write Everything Twice). These functions
* are performance critical, and we cannot
* afford to do unnecessary comparisons/switches
* inside the inner for loops */
static void video_post_process_cc(void)
{
uint16_t *src = gba_screen_pixels;
uint16_t *dst = gba_processed_pixels;
size_t x, y;
for (y = 0; y < GBA_SCREEN_HEIGHT; y++)
{
for (x = 0; x < GBA_SCREEN_PITCH; x++)
{
u16 src_color = *(src + x);
/* Convert colour to RGB555 and perform lookup */
*(dst + x) = *(gba_cc_lut + (((src_color & 0xFFC0) >> 1) | (src_color & 0x1F)));
}
src += GBA_SCREEN_PITCH;
dst += GBA_SCREEN_PITCH;
}
}
static void video_post_process_mix(void)
{
uint16_t *src_curr = gba_screen_pixels;
uint16_t *src_prev = gba_screen_pixels_prev;
uint16_t *dst = gba_processed_pixels;
size_t x, y;
for (y = 0; y < GBA_SCREEN_HEIGHT; y++)
{
for (x = 0; x < GBA_SCREEN_PITCH; x++)
{
/* Get colours from current + previous frames (RGB565) */
uint16_t rgb_curr = *(src_curr + x);
uint16_t rgb_prev = *(src_prev + x);
/* Store colours for next frame */
*(src_prev + x) = rgb_curr;
/* Mix colours
* > "Mixing Packed RGB Pixels Efficiently"
* http://blargg.8bitalley.com/info/rgb_mixing.html */
*(dst + x) = (rgb_curr + rgb_prev + ((rgb_curr ^ rgb_prev) & 0x821)) >> 1;
}
src_curr += GBA_SCREEN_PITCH;
src_prev += GBA_SCREEN_PITCH;
dst += GBA_SCREEN_PITCH;
}
}
static void video_post_process_cc_mix(void)
{
uint16_t *src_curr = gba_screen_pixels;
uint16_t *src_prev = gba_screen_pixels_prev;
uint16_t *dst = gba_processed_pixels;
size_t x, y;
for (y = 0; y < GBA_SCREEN_HEIGHT; y++)
{
for (x = 0; x < GBA_SCREEN_PITCH; x++)
{
/* Get colours from current + previous frames (RGB565) */
uint16_t rgb_curr = *(src_curr + x);
uint16_t rgb_prev = *(src_prev + x);
/* Store colours for next frame */
*(src_prev + x) = rgb_curr;
/* Mix colours
* > "Mixing Packed RGB Pixels Efficiently"
* http://blargg.8bitalley.com/info/rgb_mixing.html */
uint16_t rgb_mix = (rgb_curr + rgb_prev + ((rgb_curr ^ rgb_prev) & 0x821)) >> 1;
/* Convert colour to RGB555 and perform lookup */
*(dst + x) = *(gba_cc_lut + (((rgb_mix & 0xFFC0) >> 1) | (rgb_mix & 0x1F)));
}
src_curr += GBA_SCREEN_PITCH;
src_prev += GBA_SCREEN_PITCH;
dst += GBA_SCREEN_PITCH;
}
}
static void init_post_processing(void)
{
size_t buf_size = GBA_SCREEN_PITCH * GBA_SCREEN_HEIGHT * sizeof(u16);
video_post_process = NULL;
/* If post processing is disabled, return
* immediately */
if (!post_process_cc && !post_process_mix)
return;
/* Initialise output buffer, if required */
if (!gba_processed_pixels &&
(post_process_cc || post_process_mix))
{
#ifdef _3DS
gba_processed_pixels = (u16*)linearMemAlign(buf_size, 128);
#else
gba_processed_pixels = (u16*)malloc(buf_size);
#endif
if (!gba_processed_pixels)
return;
memset(gba_processed_pixels, 0xFFFF, buf_size);
}
/* Initialise 'history' buffer, if required */
if (!gba_screen_pixels_prev &&
post_process_mix)
{
gba_screen_pixels_prev = (u16*)malloc(buf_size);
if (!gba_screen_pixels_prev)
return;
memset(gba_screen_pixels_prev, 0xFFFF, buf_size);
}
/* Assign post processing function */
if (post_process_cc && post_process_mix)
video_post_process = video_post_process_cc_mix;
else if (post_process_cc)
video_post_process = video_post_process_cc;
else if (post_process_mix)
video_post_process = video_post_process_mix;
}
/* Video post processing END */
static void video_run(void)
{
u16 *gba_screen_pixels_buf = gba_screen_pixels;
if (skip_next_frame)
{
video_cb(NULL, GBA_SCREEN_WIDTH, GBA_SCREEN_HEIGHT,
GBA_SCREEN_PITCH * 2);
return;
}
if (video_post_process)
{
video_post_process();
gba_screen_pixels_buf = gba_processed_pixels;
}
#if defined(PSP)
static unsigned int __attribute__((aligned(16))) d_list[32];
void* texture_vram_p = NULL;
int texture_size = (GBA_SCREEN_WIDTH*GBA_SCREEN_HEIGHT*2);
texture_vram_p = (void*) (0x44200000 - texture_size); /* max VRAM address - frame size */
sceKernelDcacheWritebackRange(gba_screen_pixels_buf, texture_size);
sceGuStart(GU_DIRECT, d_list);
sceGuTexMode(GU_PSM_5650, 0, 0, GU_FALSE);
sceGuCopyImage(GU_PSM_5650, 0, 0, GBA_SCREEN_WIDTH, GBA_SCREEN_HEIGHT, GBA_SCREEN_WIDTH,
gba_screen_pixels_buf, 0, 0, GBA_SCREEN_WIDTH, texture_vram_p);
sceGuTexImage(0, next_pow2(GBA_SCREEN_WIDTH), next_pow2(GBA_SCREEN_HEIGHT), GBA_SCREEN_WIDTH, texture_vram_p);
sceGuTexFunc(GU_TFX_REPLACE, GU_TCC_RGB);
sceGuDisable(GU_BLEND);
sceGuFinish();
video_cb(texture_vram_p, GBA_SCREEN_WIDTH, GBA_SCREEN_HEIGHT,
GBA_SCREEN_PITCH * 2);
#else
video_cb(gba_screen_pixels_buf, GBA_SCREEN_WIDTH, GBA_SCREEN_HEIGHT,
GBA_SCREEN_PITCH * 2);
#endif
}
#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";
#ifndef GIT_VERSION
#define GIT_VERSION ""
#endif
info->library_version = "v0.91" GIT_VERSION;
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) GBA_FPS);
info->timing.sample_rate = GBA_SOUND_FREQUENCY;
}
void retro_init(void)
{
#if defined(_3DS) && defined(HAVE_DYNAREC)
if (__ctr_svchax && !translation_caches_inited)
{
uint32_t currentHandle;
check_rosalina();
rom_translation_cache_ptr = memalign(0x1000, ROM_TRANSLATION_CACHE_SIZE);
ram_translation_cache_ptr = memalign(0x1000, RAM_TRANSLATION_CACHE_SIZE);
svcDuplicateHandle(&currentHandle, 0xFFFF8001);
svcControlProcessMemory(currentHandle,
rom_translation_cache, rom_translation_cache_ptr,
ROM_TRANSLATION_CACHE_SIZE, MEMOP_MAP, 0b111);
svcControlProcessMemory(currentHandle,
ram_translation_cache, ram_translation_cache_ptr,
RAM_TRANSLATION_CACHE_SIZE, MEMOP_MAP, 0b111);
svcCloseHandle(currentHandle);
rom_translation_ptr = rom_translation_cache;
ram_translation_ptr = ram_translation_cache;
ctr_flush_invalidate_cache();
translation_caches_inited = 1;
}
#endif
#if defined(VITA) && defined(HAVE_DYNAREC)
if(!translation_caches_inited){
void* currentHandle;
sceBlock = getVMBlock();
if (sceBlock < 0)
{
return;
}
// get base address
int ret = sceKernelGetMemBlockBase(sceBlock, &currentHandle);
if (ret < 0)
{
return;
}
rom_translation_cache = (u8*)currentHandle;
ram_translation_cache = rom_translation_cache + ROM_TRANSLATION_CACHE_SIZE;
rom_translation_ptr = rom_translation_cache;
ram_translation_ptr = ram_translation_cache;
sceKernelOpenVMDomain();
translation_caches_inited = 1;
}
#endif
if (!gamepak_rom)
init_gamepak_buffer();
init_sound(1);
if(!gba_screen_pixels)
#ifdef _3DS
gba_screen_pixels = (uint16_t*)linearMemAlign(GBA_SCREEN_PITCH * GBA_SCREEN_HEIGHT * sizeof(uint16_t), 128);
#else
gba_screen_pixels = (uint16_t*)malloc(GBA_SCREEN_PITCH * GBA_SCREEN_HEIGHT * sizeof(uint16_t));
#endif
current_frameskip_type = no_frameskip;
frameskip_threshold = 0;
frameskip_interval = 0;
frameskip_counter = 0;
audio_buff_active = false;
audio_buff_occupancy = 0;
audio_buff_underrun = false;
audio_latency = 0;
update_audio_latency = false;
}
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);
#endif
#if defined(_3DS) && defined(HAVE_DYNAREC)
if (__ctr_svchax && translation_caches_inited)
{
uint32_t currentHandle;
svcDuplicateHandle(&currentHandle, 0xFFFF8001);
svcControlProcessMemory(currentHandle,
rom_translation_cache, rom_translation_cache_ptr,
ROM_TRANSLATION_CACHE_SIZE, MEMOP_UNMAP, 0b111);
svcControlProcessMemory(currentHandle,
ram_translation_cache, ram_translation_cache_ptr,
RAM_TRANSLATION_CACHE_SIZE, MEMOP_UNMAP, 0b111);
svcCloseHandle(currentHandle);
free(rom_translation_cache_ptr);
free(ram_translation_cache_ptr);
translation_caches_inited = 0;
}
#endif
#if defined(VITA) && defined(HAVE_DYNAREC)
if(translation_caches_inited){
translation_caches_inited = 0;
}
#endif
#ifdef _3DS
linearFree(gba_screen_pixels);
if (gba_processed_pixels)
linearFree(gba_processed_pixels);
#else
free(gba_screen_pixels);
if (gba_processed_pixels)
free(gba_processed_pixels);
#endif
if (gba_screen_pixels_prev)
free(gba_screen_pixels_prev);
gba_screen_pixels = NULL;
gba_processed_pixels = NULL;
gba_screen_pixels_prev = NULL;
video_post_process = NULL;
post_process_cc = false;
post_process_mix = false;
}
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;
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);
libretro_set_core_options(environ_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(void)
{
update_backup();
reset_gba();
}
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) {}
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)
{
struct retro_variable var;
bool frameskip_type_prev;
bool post_process_cc_prev;
bool post_process_mix_prev;
#ifdef HAVE_DYNAREC
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
var.key = "gpsp_frameskip";
var.value = 0;
frameskip_type_prev = current_frameskip_type;
current_frameskip_type = no_frameskip;
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
{
if (!strcmp(var.value, "auto"))
current_frameskip_type = auto_frameskip;
else if (!strcmp(var.value, "auto_threshold"))
current_frameskip_type = auto_threshold_frameskip;
else if (!strcmp(var.value, "fixed_interval"))
current_frameskip_type = fixed_interval_frameskip;
}
var.key = "gpsp_frameskip_threshold";
var.value = 0;
frameskip_threshold = 33;
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
frameskip_threshold = strtol(var.value, NULL, 10);
var.key = "gpsp_frameskip_interval";
var.value = 0;
frameskip_interval = 0;
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
frameskip_interval = strtol(var.value, NULL, 10);
/* (Re)Initialise frame skipping, if required */
if (started_from_load ||
(current_frameskip_type != frameskip_type_prev))
init_frameskip();
var.key = "gpsp_color_correction";
var.value = NULL;
post_process_cc_prev = post_process_cc;
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
{
if (strcmp(var.value, "disabled") == 0)
post_process_cc = false;
else if (strcmp(var.value, "enabled") == 0)
post_process_cc = true;
}
var.key = "gpsp_frame_mixing";
var.value = NULL;
post_process_mix_prev = post_process_mix;
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
{
if (strcmp(var.value, "disabled") == 0)
post_process_mix = false;
else if (strcmp(var.value, "enabled") == 0)
post_process_mix = true;
}
/* Check whether post processing options
* have changed */
if ((post_process_cc != post_process_cc_prev) ||
(post_process_mix != post_process_mix_prev))
init_post_processing();
if (started_from_load)
{
var.key = "gpsp_save_method";
var.value = NULL;
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
{
if (!strcmp(var.value, "libretro"))
use_libretro_save_method = 1;
else
use_libretro_save_method = 0;
}
}
}
static void set_input_descriptors()
{
struct retro_input_descriptor descriptors[] = {
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT, "D-Pad Left" },
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP, "D-Pad Up" },
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN, "D-Pad Down" },
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT, "D-Pad Right" },
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B, "B" },
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A, "A" },
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_SELECT, "Select" },
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START, "Start" },
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L, "L" },
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R, "R" },
{ 0 },
};
environ_cb(RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS, descriptors);
}
static void set_memory_descriptors(void)
{
const uint64_t mem = RETRO_MEMORY_SYSTEM_RAM;
struct retro_memory_descriptor desc[9] = {
{ mem, iwram, 0x00000 + 0x8000, 0x3000000, 0, 0, 0x8000, NULL },
{ mem, ewram, 0x00000 + 0x8000, 0x2000000, 0, 0, 0x8000, NULL },
{ mem, ewram, 0x10000 + 0x8000, 0x2008000, 0, 0, 0x8000, NULL },
{ mem, ewram, 0x20000 + 0x8000, 0x2010000, 0, 0, 0x8000, NULL },
{ mem, ewram, 0x30000 + 0x8000, 0x2018000, 0, 0, 0x8000, NULL },
{ mem, ewram, 0x40000 + 0x8000, 0x2020000, 0, 0, 0x8000, NULL },
{ mem, ewram, 0x50000 + 0x8000, 0x2028000, 0, 0, 0x8000, NULL },
{ mem, ewram, 0x60000 + 0x8000, 0x2030000, 0, 0, 0x8000, NULL },
{ mem, ewram, 0x70000 + 0x8000, 0x2038000, 0, 0, 0x8000, NULL }
};
struct retro_memory_map retromap = {
desc,
sizeof(desc) / sizeof(desc[0])
};
environ_cb(RETRO_ENVIRONMENT_SET_MEMORY_MAPS, &retromap);
}
bool retro_load_game(const struct retro_game_info* info)
{
if (!info)
return false;
use_libretro_save_method = 0;
check_variables(1);
set_input_descriptors();
#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);
rom_translation_ptr = rom_translation_cache;
ram_translation_ptr = ram_translation_cache;
#elif defined(_3DS)
dynarec_enable = __ctr_svchax;
rom_translation_ptr = rom_translation_cache;
ram_translation_ptr = ram_translation_cache;
#elif defined(PSP) || defined(VITA)
dynarec_enable = 1;
rom_translation_ptr = rom_translation_cache;
ram_translation_ptr = ram_translation_cache;
#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)
strcpy(filename_bios, dir);
else
strcpy(filename_bios, main_path);
strcat(filename_bios, "/gba_bios.bin");
if (environ_cb(RETRO_ENVIRONMENT_GET_SAVE_DIRECTORY, &dir) && dir)
strcpy(save_path, dir);
else
strcpy(save_path, main_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.");
}
memset(gamepak_backup, -1, sizeof(gamepak_backup));
gamepak_filename[0] = 0;
if (load_gamepak(info, info->path) != 0)
{
error_msg("Could not load the game file.");
return false;
}
reset_gba();
set_memory_descriptors();
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)
{
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:
if (use_libretro_save_method)
return gamepak_backup;
break;
default:
break;
}
return 0;
}
size_t retro_get_memory_size(unsigned id)
{
switch (id)
{
case RETRO_MEMORY_SAVE_RAM:
if (use_libretro_save_method)
{
switch(backup_type)
{
case BACKUP_SRAM:
if(sram_size == SRAM_SIZE_32KB)
return 0x8000;
else
return 0x10000;
break;
case BACKUP_FLASH:
if(flash_size == FLASH_SIZE_64KB)
return 0x10000;
else
return 0x20000;
break;
case BACKUP_EEPROM:
if(eeprom_size == EEPROM_512_BYTE)
return 0x200;
else
return 0x2000;
break;
// assume 128KB save, regardless if rom supports battery saves
// this is needed because gba cannot provide initially the backup save size
// until a few cycles has passed (unless provided by a database)
case BACKUP_NONE:
default:
return (1024 * 128);
break;
}
}
break;
default:
break;
}
return 0;
}
void retro_run(void)
{
bool updated = false;
update_input();
input_poll_cb();
/* Check whether current frame should
* be skipped */
skip_next_frame = 0;
if (current_frameskip_type != no_frameskip)
{
switch (current_frameskip_type)
{
case auto_frameskip:
skip_next_frame =
(audio_buff_active && audio_buff_underrun) ?
1 : 0;
if (!skip_next_frame ||
(frameskip_counter >= FRAMESKIP_MAX))
{
skip_next_frame = 0;
frameskip_counter = 0;
}
else
frameskip_counter++;
break;
case auto_threshold_frameskip:
skip_next_frame =
(audio_buff_active &&
(audio_buff_occupancy < frameskip_threshold)) ?
1 : 0;
if (!skip_next_frame ||
(frameskip_counter >= FRAMESKIP_MAX))
{
skip_next_frame = 0;
frameskip_counter = 0;
}
else
frameskip_counter++;
break;
case fixed_interval_frameskip:
if (frameskip_counter < frameskip_interval)
{
skip_next_frame = 1;
frameskip_counter++;
}
else
{
skip_next_frame = 0;
frameskip_counter = 0;
}
break;
default:
skip_next_frame = 0;
break;
}
}
/* If frameskip settings have changed, update
* frontend audio latency */
if (update_audio_latency)
{
environ_cb(RETRO_ENVIRONMENT_SET_MINIMUM_AUDIO_LATENCY,
&audio_latency);
update_audio_latency = false;
}
/* This runs just a frame */
#ifdef HAVE_DYNAREC
if (dynarec_enable)
execute_arm_translate(execute_cycles);
else
#endif
execute_arm(execute_cycles);
render_audio();
video_run();
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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