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gpsp/libretro/libretro.c

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#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <streams/file_stream.h>
#include <libretro.h>
#include "../common.h"
#include "../memmap.h"
#include "libretro_core_options.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
// Usually 59.72750057 Hz, unless GBC_RATE is overclocked (for 60FPS)
#define GBA_FPS ((float) GBC_BASE_RATE) / (308 * 228 * 4)
static s16 *audio_sample_buffer = NULL;
static float audio_samples_per_frame = 0.0f;
static float audio_samples_accumulator = 0.0f;
/* Workaround for a RetroArch audio driver
* limitation: a maximum of 1024 frames
* can be written per call of audio_batch_cb() */
#define AUDIO_BATCH_FRAMES_MAX 1024
/* 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 bios_type selected_bios = auto_detect;
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_environment_t environ_cb;
struct retro_perf_callback perf_cb;
int dynarec_enable;
boot_mode selected_boot_mode = boot_game;
int sprite_limit = 1;
u32 idle_loop_target_pc = 0xFFFFFFFF;
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;
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);
}
static void show_warning_message(const char* text, unsigned durationms) {
unsigned ifversion = 0;
if (!environ_cb(RETRO_ENVIRONMENT_GET_MESSAGE_INTERFACE_VERSION, &ifversion) || ifversion >= 1) {
/* Use the new API to display messages */
struct retro_message_ext msg = {
.msg = text, .duration = durationms,
.priority = 2, .level = RETRO_LOG_WARN,
.target = RETRO_MESSAGE_TARGET_ALL,
.type = RETRO_MESSAGE_TYPE_NOTIFICATION,
.progress = -1,
};
environ_cb(RETRO_ENVIRONMENT_SET_MESSAGE_EXT, &msg);
}
else {
struct retro_message msg = {.msg = text, .frames = durationms / 17};
environ_cb(RETRO_ENVIRONMENT_SET_MESSAGE, &msg);
}
}
/* 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)
{
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(GBA_SCREEN_BUFFER_SIZE, 128);
#else
gba_processed_pixels = (u16*)malloc(GBA_SCREEN_BUFFER_SIZE);
#endif
if (!gba_processed_pixels)
return;
memset(gba_processed_pixels, 0xFFFF, GBA_SCREEN_BUFFER_SIZE);
}
/* Initialise 'history' buffer, if required */
if (!gba_screen_pixels_prev &&
post_process_mix)
{
gba_screen_pixels_prev = (u16*)malloc(GBA_SCREEN_BUFFER_SIZE);
if (!gba_screen_pixels_prev)
return;
memset(gba_screen_pixels_prev, 0xFFFF, GBA_SCREEN_BUFFER_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 */
/* Fast forward override */
void set_fastforward_override(bool fastforward)
{
struct retro_fastforwarding_override ff_override;
if (!libretro_supports_ff_override)
return;
ff_override.ratio = -1.0f;
ff_override.notification = true;
if (fastforward)
{
ff_override.fastforward = true;
ff_override.inhibit_toggle = true;
}
else
{
ff_override.fastforward = false;
ff_override.inhibit_toggle = false;
}
environ_cb(RETRO_ENVIRONMENT_SET_FASTFORWARDING_OVERRIDE, &ff_override);
}
static void audio_run(void)
{
s16 *audio_buffer_ptr;
u32 samples_to_read;
u32 samples_produced;
/* audio_samples_per_frame is decimal;
* get integer component */
samples_to_read = (u32)audio_samples_per_frame;
/* Account for fractional component */
audio_samples_accumulator += audio_samples_per_frame -
(float)samples_to_read;
if (audio_samples_accumulator >= 1.0f)
{
samples_to_read++;
audio_samples_accumulator -= 1.0f;
}
samples_produced = sound_read_samples(audio_sample_buffer, samples_to_read);
/* Workaround for a RetroArch audio driver
* limitation: a maximum of 1024 frames
* can be written per call of audio_batch_cb(),
* so we have to send samples in chunks */
audio_buffer_ptr = audio_sample_buffer;
while (samples_produced > 0)
{
u32 samples_to_write = (samples_produced > AUDIO_BATCH_FRAMES_MAX) ?
AUDIO_BATCH_FRAMES_MAX : samples_produced;
audio_batch_cb(audio_buffer_ptr, samples_to_write);
samples_produced -= samples_to_write;
audio_buffer_ptr += samples_to_write << 1;
}
}
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;
}
video_cb(gba_screen_pixels_buf, GBA_SCREEN_WIDTH, GBA_SCREEN_HEIGHT,
GBA_SCREEN_PITCH * 2);
}
#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|u1" ;
}
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 = 3.0f / 2.0f;
info->timing.fps = ((float) GBA_FPS);
info->timing.sample_rate = GBA_SOUND_FREQUENCY;
}
void retro_init(void)
{
u32 audio_sample_buffer_size;
audio_samples_per_frame = (float)(GBA_SOUND_FREQUENCY) / (float)(GBA_FPS);
audio_samples_accumulator = 0.0f;
audio_sample_buffer_size = ((u32)audio_samples_per_frame + 1) * 2;
audio_sample_buffer = (s16*)malloc(audio_sample_buffer_size * sizeof(s16));
#if defined(HAVE_DYNAREC)
#if defined(MMAP_JIT_CACHE)
rom_translation_cache = map_jit_block(ROM_TRANSLATION_CACHE_SIZE + RAM_TRANSLATION_CACHE_SIZE);
ram_translation_cache = &rom_translation_cache[ROM_TRANSLATION_CACHE_SIZE];
#elif defined(_3DS)
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;
}
#elif defined(VITA)
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
#endif
init_gamepak_buffer();
init_sound();
if(!gba_screen_pixels)
#ifdef _3DS
gba_screen_pixels = (uint16_t*)linearMemAlign(GBA_SCREEN_BUFFER_SIZE, 128);
#else
gba_screen_pixels = (uint16_t*)malloc(GBA_SCREEN_BUFFER_SIZE);
#endif
libretro_supports_bitmasks = false;
if (environ_cb(RETRO_ENVIRONMENT_GET_INPUT_BITMASKS, NULL))
libretro_supports_bitmasks = true;
libretro_supports_ff_override = false;
if (environ_cb(RETRO_ENVIRONMENT_SET_FASTFORWARDING_OVERRIDE, NULL))
libretro_supports_ff_override = true;
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;
selected_bios = auto_detect;
selected_boot_mode = boot_game;
}
void retro_deinit(void)
{
perf_cb.perf_log();
memory_term();
#if defined(MMAP_JIT_CACHE) && defined(HAVE_DYNAREC)
unmap_jit_block(rom_translation_cache, ROM_TRANSLATION_CACHE_SIZE + 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;
if (audio_sample_buffer)
free(audio_sample_buffer);
audio_sample_buffer = NULL;
audio_samples_per_frame = 0.0f;
audio_samples_accumulator = 0.0f;
}
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;
struct retro_vfs_interface_info vfs_iface_info;
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);
vfs_iface_info.required_interface_version = 2;
vfs_iface_info.iface = NULL;
if (environ_cb(RETRO_ENVIRONMENT_GET_VFS_INTERFACE, &vfs_iface_info))
filestream_vfs_init(&vfs_iface_info);
libretro_set_core_options(environ_cb);
}
void retro_set_video_refresh(retro_video_refresh_t cb)
{
video_cb = cb;
}
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_controller_port_device(unsigned port, unsigned device) {}
void retro_reset(void)
{
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;
return gba_load_state(data);
}
void retro_cheat_reset(void)
{
cheat_clear();
}
void retro_cheat_set(unsigned index, bool enabled, const char* code)
{
if (!enabled)
return;
switch (cheat_parse(index, code))
{
case CheatErrorTooMany:
show_warning_message("Too many active cheats!", 2500);
break;
case CheatErrorTooBig:
show_warning_message("Cheats are too big!", 2500);
break;
case CheatErrorEncrypted:
show_warning_message("Encrypted cheats are not supported!", 2500);
break;
case CheatErrorNotSupported:
show_warning_message("Cheat type is not supported!", 2500);
break;
case CheatNoError:
break;
};
}
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)
{
int prevvalue = dynarec_enable;
if (strcmp(var.value, "disabled") == 0)
dynarec_enable = 0;
else if (strcmp(var.value, "enabled") == 0)
dynarec_enable = 1;
/* Flush dynarec cache to ensure we do not execute old code */
if (dynarec_enable != prevvalue)
flush_dynarec_caches();
}
else
dynarec_enable = 1;
#else
dynarec_enable = 0;
#endif
if (started_from_load) {
var.key = "gpsp_bios";
var.value = 0;
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
{
if (!strcmp(var.value, "auto"))
selected_bios = auto_detect;
else if (!strcmp(var.value, "builtin"))
selected_bios = builtin_bios;
else if (!strcmp(var.value, "official"))
selected_bios = official_bios;
}
var.key = "gpsp_boot_mode";
var.value = 0;
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
{
if (!strcmp(var.value, "game"))
selected_boot_mode = boot_game;
else if (!strcmp(var.value, "bios"))
selected_boot_mode = boot_bios;
}
}
var.key = "gpsp_sprlim";
var.value = 0;
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
{
if (strcmp(var.value, "disabled") == 0)
sprite_limit = 1;
else if (strcmp(var.value, "enabled") == 0)
sprite_limit = 0;
}
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();
var.key = "gpsp_turbo_period";
var.value = NULL;
turbo_period = TURBO_PERIOD_MIN;
turbo_pulse_width = TURBO_PULSE_WIDTH_MIN;
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
{
turbo_period = atoi(var.value);
turbo_period = (turbo_period < TURBO_PERIOD_MIN) ?
TURBO_PERIOD_MIN : turbo_period;
turbo_period = (turbo_period > TURBO_PERIOD_MAX) ?
TURBO_PERIOD_MAX : turbo_period;
turbo_pulse_width = turbo_period >> 1;
turbo_pulse_width = (turbo_pulse_width < TURBO_PULSE_WIDTH_MIN) ?
TURBO_PULSE_WIDTH_MIN : turbo_pulse_width;
turbo_pulse_width = (turbo_pulse_width > TURBO_PULSE_WIDTH_MAX) ?
TURBO_PULSE_WIDTH_MAX : turbo_pulse_width;
turbo_a_counter = 0;
turbo_b_counter = 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_Y, "Turbo B" },
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_X, "Turbo 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 },
};
struct retro_input_descriptor descriptors_ff[] = {
{ 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_Y, "Turbo B" },
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_X, "Turbo 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, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R2, "Fast Forward" },
{ 0 },
};
if (libretro_supports_ff_override)
environ_cb(RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS, descriptors_ff);
else
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[2] = {
{ mem, iwram, 0x00000 + 0x8000, 0x3000000, 0, 0, 0x8000, NULL },
{ mem, ewram, 0x00000, 0x2000000, 0, 0, 0x40000, 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;
check_variables(1);
set_input_descriptors();
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);
bool bios_loaded = false;
if (selected_bios == auto_detect || selected_bios == official_bios)
{
bios_loaded = true;
strcat(filename_bios, "/gba_bios.bin");
if (load_bios(filename_bios) != 0)
{
if (selected_bios == official_bios)
show_warning_message("Could not load BIOS image file, using built-in BIOS", 2500);
bios_loaded = false;
}
if (bios_loaded && bios_rom[0] != 0x18)
{
if (selected_bios == official_bios)
show_warning_message("BIOS image seems incorrect, using built-in BIOS", 2500);
bios_loaded = false;
}
}
if (!bios_loaded) {
/* Load the built-in BIOS */
memcpy(bios_rom, open_gba_bios_rom, sizeof(bios_rom));
}
memset(gamepak_backup, 0xff, sizeof(gamepak_backup));
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)
{
if (libretro_ff_enabled)
set_fastforward_override(false);
libretro_supports_bitmasks = false;
libretro_supports_ff_override = false;
libretro_ff_enabled = false;
libretro_ff_enabled_prev = false;
turbo_period = TURBO_PERIOD_MIN;
turbo_pulse_width = TURBO_PULSE_WIDTH_MIN;
turbo_a_counter = 0;
turbo_b_counter = 0;
}
unsigned retro_get_region(void)
{
return RETRO_REGION_NTSC;
}
void* retro_get_memory_data(unsigned id)
{
if (id == RETRO_MEMORY_SAVE_RAM)
return gamepak_backup;
return NULL;
}
size_t retro_get_memory_size(unsigned id)
{
if (id == RETRO_MEMORY_SAVE_RAM)
return 0x20000; /* Assume 128KiB, biggest possible save */
return 0;
}
void retro_run(void)
{
bool updated = false;
input_poll_cb();
update_input();
/* 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
{
/* Sticky bits only used in interpreter */
clear_gamepak_stickybits();
execute_arm(execute_cycles);
}
audio_run();
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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