[picodrive.git] / platform / libretro.c

/*
 * libretro core glue for PicoDrive
 * (C) notaz, 2013
 *
 * This work is licensed under the terms of MAME license.
 * See COPYING file in the top-level directory.
 */

#define _GNU_SOURCE 1 // mremap
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <sys/mman.h>
#include <errno.h>
#ifdef __MACH__
#include <libkern/OSCacheControl.h>
#endif

#include <pico/pico_int.h>
#include <pico/state.h>
#include "common/input_pico.h"
#include "common/version.h"
#include "libretro.h"

#ifndef MAP_ANONYMOUS
#define MAP_ANONYMOUS MAP_ANON
#endif

static retro_video_refresh_t video_cb;
static retro_input_poll_t input_poll_cb;
static retro_input_state_t input_state_cb;
static retro_environment_t environ_cb;
static retro_audio_sample_batch_t audio_batch_cb;

static FILE *emu_log;

#define VOUT_MAX_WIDTH 320
#define VOUT_MAX_HEIGHT 240
static void *vout_buf;
static int vout_width, vout_height;

static short __attribute__((aligned(4))) sndBuffer[2*44100/50];

static void snd_write(int len);

#ifdef _WIN32
#define SLASH '\\'
#else
#define SLASH '/'
#endif

/* functions called by the core */

void cache_flush_d_inval_i(void *start, void *end)
{
#ifdef __arm__
#if defined(__BLACKBERRY_QNX__)
	msync(start, end - start, MS_SYNC | MS_CACHE_ONLY | MS_INVALIDATE_ICACHE);
#elif defined(__MACH__)
	size_t len = (char *)end - (char *)start;
	sys_dcache_flush(start, len);
	sys_icache_invalidate(start, len);
#else
	__clear_cache(start, end);
#endif
#endif
}

void *plat_mmap(unsigned long addr, size_t size, int need_exec, int is_fixed)
{
	int flags = MAP_PRIVATE | MAP_ANONYMOUS;
	void *req, *ret;

	req = (void *)addr;
	ret = mmap(req, size, PROT_READ | PROT_WRITE, flags, -1, 0);
	if (ret == MAP_FAILED) {
		lprintf("mmap(%08lx, %zd) failed: %d\n", addr, size, errno);
		return NULL;
	}

	if (addr != 0 && ret != (void *)addr) {
		lprintf("warning: wanted to map @%08lx, got %p\n",
			addr, ret);

		if (is_fixed) {
			munmap(ret, size);
			return NULL;
		}
	}

	return ret;
}

void *plat_mremap(void *ptr, size_t oldsize, size_t newsize)
{
#ifdef __linux__
	void *ret = mremap(ptr, oldsize, newsize, 0);
	if (ret == MAP_FAILED)
		return NULL;

	return ret;
#else
	void *tmp, *ret;
	size_t preserve_size;
	
	preserve_size = oldsize;
	if (preserve_size > newsize)
		preserve_size = newsize;
	tmp = malloc(preserve_size);
	if (tmp == NULL)
		return NULL;
	memcpy(tmp, ptr, preserve_size);

	munmap(ptr, oldsize);
	ret = mmap(ptr, newsize, PROT_READ | PROT_WRITE,
		   MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
	if (ret == MAP_FAILED) {
		free(tmp);
		return NULL;
	}
	memcpy(ret, tmp, preserve_size);
	free(tmp);
	return ret;
#endif
}

void plat_munmap(void *ptr, size_t size)
{
	if (ptr != NULL)
		munmap(ptr, size);
}

int plat_mem_set_exec(void *ptr, size_t size)
{
	int ret = mprotect(ptr, size, PROT_READ | PROT_WRITE | PROT_EXEC);
	if (ret != 0)
		lprintf("mprotect(%p, %zd) failed: %d\n", ptr, size, errno);

	return ret;
}

void emu_video_mode_change(int start_line, int line_count, int is_32cols)
{
	memset(vout_buf, 0, 320 * 240 * 2);
	vout_width = is_32cols ? 256 : 320;
	PicoDrawSetOutBuf(vout_buf, vout_width * 2);
}

void emu_32x_startup(void)
{
}

#ifndef ANDROID

void lprintf(const char *fmt, ...)
{
	va_list list;

	va_start(list, fmt);
	fprintf(emu_log, "PicoDrive: ");
	vfprintf(emu_log, fmt, list);
	va_end(list);
	fflush(emu_log);
}

#else

#include <android/log.h>

void lprintf(const char *fmt, ...)
{
	va_list list;

	va_start(list, fmt);
	__android_log_vprint(ANDROID_LOG_INFO, "PicoDrive", fmt, list);
	va_end(list);
}

#endif

/* libretro */
void retro_set_environment(retro_environment_t cb)
{
	static const struct retro_variable vars[] = {
		//{ "region", "Region; Auto|NTSC|PAL" },
		{ "picodrive_input1", "Input device 1; 3 button pad|6 button pad|None" },
		{ "picodrive_input2", "Input device 2; 3 button pad|6 button pad|None" },
#ifdef DRC_SH2
		{ "picodrive_drc", "Dynamic recompilers; enabled|disabled" },
#endif
		{ NULL, NULL },
	};

	environ_cb = cb;

	cb(RETRO_ENVIRONMENT_SET_VARIABLES, (void *)vars);
}

void retro_set_video_refresh(retro_video_refresh_t cb) { video_cb = cb; }
void retro_set_audio_sample(retro_audio_sample_t cb) { (void)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; }

unsigned retro_api_version(void)
{
	return RETRO_API_VERSION;
}

void retro_set_controller_port_device(unsigned port, unsigned device)
{
}

void retro_get_system_info(struct retro_system_info *info)
{
	memset(info, 0, sizeof(*info));
	info->library_name = "PicoDrive";
	info->library_version = VERSION;
	info->valid_extensions = "bin|gen|smd|md|32x|cue|iso|sms";
	info->need_fullpath = true;
}

void retro_get_system_av_info(struct retro_system_av_info *info)
{
	memset(info, 0, sizeof(*info));
	info->timing.fps            = Pico.m.pal ? 50 : 60;
	info->timing.sample_rate    = 44100;
	info->geometry.base_width   = 320;
	info->geometry.base_height  = 240;
	info->geometry.max_width    = VOUT_MAX_WIDTH;
	info->geometry.max_height   = VOUT_MAX_HEIGHT;
	info->geometry.aspect_ratio = 4.0 / 3.0;
}

/* savestates */
struct savestate_state {
	const char *load_buf;
	char *save_buf;
	size_t size;
	size_t pos;
};

size_t state_read(void *p, size_t size, size_t nmemb, void *file)
{
	struct savestate_state *state = file;
	size_t bsize = size * nmemb;

	if (state->pos + bsize > state->size) {
		lprintf("savestate error: %u/%u\n",
			state->pos + bsize, state->size);
		bsize = state->size - state->pos;
		if ((int)bsize <= 0)
			return 0;
	}

	memcpy(p, state->load_buf + state->pos, bsize);
	state->pos += bsize;
	return bsize;
}

size_t state_write(void *p, size_t size, size_t nmemb, void *file)
{
	struct savestate_state *state = file;
	size_t bsize = size * nmemb;

	if (state->pos + bsize > state->size) {
		lprintf("savestate error: %u/%u\n",
			state->pos + bsize, state->size);
		bsize = state->size - state->pos;
		if ((int)bsize <= 0)
			return 0;
	}

	memcpy(state->save_buf + state->pos, p, bsize);
	state->pos += bsize;
	return bsize;
}

size_t state_skip(void *p, size_t size, size_t nmemb, void *file)
{
	struct savestate_state *state = file;
	size_t bsize = size * nmemb;

	state->pos += bsize;
	return bsize;
}

size_t state_eof(void *file)
{
	struct savestate_state *state = file;

	return state->pos >= state->size;
}

int state_fseek(void *file, long offset, int whence)
{
	struct savestate_state *state = file;

	switch (whence) {
	case SEEK_SET:
		state->pos = offset;
		break;
	case SEEK_CUR:
		state->pos += offset;
		break;
	case SEEK_END:
		state->pos = state->size + offset;
		break;
	}
	return (int)state->pos;
}

/* savestate sizes vary wildly depending if cd/32x or
 * carthw is active, so run the whole thing to get size */
size_t retro_serialize_size(void) 
{ 
	struct savestate_state state = { 0, };
	int ret;

	ret = PicoStateFP(&state, 1, NULL, state_skip, NULL, state_fseek);
	if (ret != 0)
		return 0;

	return state.pos;
}

bool retro_serialize(void *data, size_t size)
{ 
	struct savestate_state state = { 0, };
	int ret;

	state.save_buf = data;
	state.size = size;
	state.pos = 0;

	ret = PicoStateFP(&state, 1, NULL, state_write,
		NULL, state_fseek);
	return ret == 0;
}

bool retro_unserialize(const void *data, size_t size)
{
	struct savestate_state state = { 0, };
	int ret;

	state.load_buf = data;
	state.size = size;
	state.pos = 0;

	ret = PicoStateFP(&state, 0, state_read, NULL,
		state_eof, state_fseek);
	return ret == 0;
}

/* cheats - TODO */
void retro_cheat_reset(void)
{
}

void retro_cheat_set(unsigned index, bool enabled, const char *code)
{
}

/* multidisk support */
static bool disk_ejected;
static unsigned int disk_current_index;
static unsigned int disk_count;
static struct disks_state {
	char *fname;
} disks[8];

static bool disk_set_eject_state(bool ejected)
{
	// TODO?
	disk_ejected = ejected;
	return true;
}

static bool disk_get_eject_state(void)
{
	return disk_ejected;
}

static unsigned int disk_get_image_index(void)
{
	return disk_current_index;
}

static bool disk_set_image_index(unsigned int index)
{
	cd_img_type cd_type;
	int ret;

	if (index >= sizeof(disks) / sizeof(disks[0]))
		return false;

	if (disks[index].fname == NULL) {
		lprintf("missing disk #%u\n", index);

		// RetroArch specifies "no disk" with index == count,
		// so don't fail here..
		disk_current_index = index;
		return true;
	}

	lprintf("switching to disk %u: \"%s\"\n", index,
		disks[index].fname);

	ret = -1;
	cd_type = PicoCdCheck(disks[index].fname, NULL);
	if (cd_type != CIT_NOT_CD)
		ret = Insert_CD(disks[index].fname, cd_type);
	if (ret != 0) {
		lprintf("Load failed, invalid CD image?\n");
		return 0;
	}

	disk_current_index = index;
	return true;
}

static unsigned int disk_get_num_images(void)
{
	return disk_count;
}

static bool disk_replace_image_index(unsigned index,
	const struct retro_game_info *info)
{
	bool ret = true;

	if (index >= sizeof(disks) / sizeof(disks[0]))
		return false;

	if (disks[index].fname != NULL)
		free(disks[index].fname);
	disks[index].fname = NULL;

	if (info != NULL) {
		disks[index].fname = strdup(info->path);
		if (index == disk_current_index)
			ret = disk_set_image_index(index);
	}

	return ret;
}

static bool disk_add_image_index(void)
{
	if (disk_count >= sizeof(disks) / sizeof(disks[0]))
		return false;

	disk_count++;
	return true;
}

static struct retro_disk_control_callback disk_control = {
	.set_eject_state = disk_set_eject_state,
	.get_eject_state = disk_get_eject_state,
	.get_image_index = disk_get_image_index,
	.set_image_index = disk_set_image_index,
	.get_num_images = disk_get_num_images,
	.replace_image_index = disk_replace_image_index,
	.add_image_index = disk_add_image_index,
};

static void disk_tray_open(void)
{
	lprintf("cd tray open\n");
	disk_ejected = 1;
}

static void disk_tray_close(void)
{
	lprintf("cd tray close\n");
	disk_ejected = 0;
}


static const char * const biosfiles_us[] = {
	"us_scd1_9210", "us_scd2_9306", "SegaCDBIOS9303", "bios_CD_U"
};
static const char * const biosfiles_eu[] = {
	"eu_mcd1_9210", "eu_mcd2_9306", "eu_mcd2_9303", "bios_CD_E"
};
static const char * const biosfiles_jp[] = {
	"jp_mcd1_9112", "jp_mcd1_9111", "bios_CD_J"
};

static void make_system_path(char *buf, size_t buf_size,
	const char *name, const char *ext)
{
	const char *dir = NULL;

	if (environ_cb(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &dir) && dir) {
		snprintf(buf, buf_size, "%s%c%s%s", dir, SLASH, name, ext);
	}
	else {
		snprintf(buf, buf_size, "%s%s", name, ext);
	}
}

static const char *find_bios(int *region, const char *cd_fname)
{
	const char * const *files;
	static char path[256];
	int i, count;
	FILE *f = NULL;

	if (*region == 4) { // US
		files = biosfiles_us;
		count = sizeof(biosfiles_us) / sizeof(char *);
	} else if (*region == 8) { // EU
		files = biosfiles_eu;
		count = sizeof(biosfiles_eu) / sizeof(char *);
	} else if (*region == 1 || *region == 2) {
		files = biosfiles_jp;
		count = sizeof(biosfiles_jp) / sizeof(char *);
	} else {
		return NULL;
	}

	for (i = 0; i < count; i++)
	{
		make_system_path(path, sizeof(path), files[i], ".bin");
		f = fopen(path, "rb");
		if (f != NULL)
			break;

		make_system_path(path, sizeof(path), files[i], ".zip");
		f = fopen(path, "rb");
		if (f != NULL)
			break;
	}

	if (f != NULL) {
		lprintf("using bios: %s\n", path);
		fclose(f);
		return path;
	}

	return NULL;
}

bool retro_load_game(const struct retro_game_info *info)
{
	enum media_type_e media_type;
	static char carthw_path[256];
	size_t i;

	enum retro_pixel_format fmt = RETRO_PIXEL_FORMAT_RGB565;
	if (!environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt)) {
		lprintf("RGB565 support required, sorry\n");
		return false;
	}

	if (info == NULL || info->path == NULL) {
		lprintf("info->path required\n");
		return false;
	}

	for (i = 0; i < sizeof(disks) / sizeof(disks[0]); i++) {
		if (disks[i].fname != NULL) {
			free(disks[i].fname);
			disks[i].fname = NULL;
		}
	}

	disk_current_index = 0;
	disk_count = 1;
	disks[0].fname = strdup(info->path);

	make_system_path(carthw_path, sizeof(carthw_path), "carthw", ".cfg");

	media_type = PicoLoadMedia(info->path, carthw_path,
			find_bios, NULL);

	switch (media_type) {
	case PM_BAD_DETECT:
		lprintf("Failed to detect ROM/CD image type.\n");
		return false;
	case PM_BAD_CD:
		lprintf("Invalid CD image\n");
		return false;
	case PM_BAD_CD_NO_BIOS:
		lprintf("Missing BIOS\n");
		return false;
	case PM_ERROR:
		lprintf("Load error\n");
		return false;
	default:
		break;
	}

	PicoLoopPrepare();

	PicoWriteSound = snd_write;
	memset(sndBuffer, 0, sizeof(sndBuffer));
	PsndOut = sndBuffer;
	PsndRerate(1);

	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) 
{
}

unsigned retro_get_region(void)
{
	return Pico.m.pal ? RETRO_REGION_PAL : RETRO_REGION_NTSC;
}

void *retro_get_memory_data(unsigned id)
{
	if (id != RETRO_MEMORY_SAVE_RAM)
		return NULL;

	if (PicoAHW & PAHW_MCD)
		return Pico_mcd->bram;
	else
		return SRam.data;
}

size_t retro_get_memory_size(unsigned id)
{
	if (id != RETRO_MEMORY_SAVE_RAM)
		return 0;

	if (PicoAHW & PAHW_MCD)
		// bram
		return 0x2000;
	else
		return SRam.size;
}

void retro_reset(void)
{
	PicoReset();
}

static const unsigned short retro_pico_map[] = {
	[RETRO_DEVICE_ID_JOYPAD_B]	= 1 << GBTN_B,
	[RETRO_DEVICE_ID_JOYPAD_Y]	= 1 << GBTN_A,
	[RETRO_DEVICE_ID_JOYPAD_SELECT]	= 1 << GBTN_MODE,
	[RETRO_DEVICE_ID_JOYPAD_START]	= 1 << GBTN_START,
	[RETRO_DEVICE_ID_JOYPAD_UP]	= 1 << GBTN_UP,
	[RETRO_DEVICE_ID_JOYPAD_DOWN]	= 1 << GBTN_DOWN,
	[RETRO_DEVICE_ID_JOYPAD_LEFT]	= 1 << GBTN_LEFT,
	[RETRO_DEVICE_ID_JOYPAD_RIGHT]	= 1 << GBTN_RIGHT,
	[RETRO_DEVICE_ID_JOYPAD_A]	= 1 << GBTN_C,
	[RETRO_DEVICE_ID_JOYPAD_X]	= 1 << GBTN_Y,
	[RETRO_DEVICE_ID_JOYPAD_L]	= 1 << GBTN_X,
	[RETRO_DEVICE_ID_JOYPAD_R]	= 1 << GBTN_Z,
};
#define RETRO_PICO_MAP_LEN (sizeof(retro_pico_map) / sizeof(retro_pico_map[0]))

static void snd_write(int len)
{
	audio_batch_cb(PsndOut, len / 4);
}

static enum input_device input_name_to_val(const char *name)
{
	if (strcmp(name, "3 button pad") == 0)
		return PICO_INPUT_PAD_3BTN;
	if (strcmp(name, "6 button pad") == 0)
		return PICO_INPUT_PAD_6BTN;
	if (strcmp(name, "None") == 0)
		return PICO_INPUT_NOTHING;

	lprintf("invalid picodrive_input: '%s'\n", name);
	return PICO_INPUT_PAD_3BTN;
}

static void update_variables(void)
{
	struct retro_variable var;

	var.value = NULL;
	var.key = "picodrive_input1";
	if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
		PicoSetInputDevice(0, input_name_to_val(var.value));

	var.value = NULL;
	var.key = "picodrive_input2";
	if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
		PicoSetInputDevice(1, input_name_to_val(var.value));

#ifdef DRC_SH2
	var.value = NULL;
	var.key = "picodrive_drc";
	if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
		if (strcmp(var.value, "enabled") == 0)
			PicoOpt |= POPT_EN_DRC;
		else
			PicoOpt &= ~POPT_EN_DRC;
	}
#endif
}

void retro_run(void) 
{
	bool updated = false;
	int pad, i;

	if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
		update_variables();

	input_poll_cb();

	PicoPad[0] = PicoPad[1] = 0;
	for (pad = 0; pad < 2; pad++)
		for (i = 0; i < RETRO_PICO_MAP_LEN; i++)
			if (input_state_cb(pad, RETRO_DEVICE_JOYPAD, 0, i))
				PicoPad[pad] |= retro_pico_map[i];

	PicoFrame();

	video_cb(vout_buf, vout_width, vout_height, vout_width * 2);
}

void retro_init(void)
{
	int level;

#ifdef IOS
	emu_log = fopen("/User/Documents/PicoDrive.log", "w");
	if (emu_log == NULL)
		emu_log = fopen("PicoDrive.log", "w");
	if (emu_log == NULL)
#endif
	emu_log = stdout;

	level = 0;
	environ_cb(RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL, &level);

	environ_cb(RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE, &disk_control);

	PicoOpt = POPT_EN_STEREO|POPT_EN_FM|POPT_EN_PSG|POPT_EN_Z80
		| POPT_EN_MCD_PCM|POPT_EN_MCD_CDDA|POPT_EN_MCD_GFX
		| POPT_EN_32X|POPT_EN_PWM
		| POPT_ACC_SPRITES|POPT_DIS_32C_BORDER;
#ifdef __arm__
	PicoOpt |= POPT_EN_SVP_DRC;
#endif
	PsndRate = 44100;
	PicoAutoRgnOrder = 0x184; // US, EU, JP
	PicoCDBuffers = 0;

	vout_width = 320;
	vout_height = 240;
	vout_buf = malloc(VOUT_MAX_WIDTH * VOUT_MAX_HEIGHT * 2);

	PicoInit();
	PicoDrawSetOutFormat(PDF_RGB555, 0);
	PicoDrawSetOutBuf(vout_buf, vout_width * 2);

	//PicoMessage = plat_status_msg_busy_next;
	PicoMCDopenTray = disk_tray_open;
	PicoMCDcloseTray = disk_tray_close;

	update_variables();
}

void retro_deinit(void)
{
	PicoExit();
}
Commit	Line	Data
2446536b	1	/*
	2	* libretro core glue for PicoDrive
	3	* (C) notaz, 2013
	4	*
	5	* This work is licensed under the terms of MAME license.
	6	* See COPYING file in the top-level directory.
	7	*/
	8
	9	#define _GNU_SOURCE 1 // mremap
	10	#include <stdio.h>
	11	#include <stdarg.h>
	12	#include <string.h>
	13	#include <sys/mman.h>
c25d78ee	14	#include <errno.h>
2446536b	15	#ifdef __MACH__
	16	#include <libkern/OSCacheControl.h>
	17	#endif
	18
	19	#include <pico/pico_int.h>
86b38dc4	20	#include <pico/state.h>
2446536b	21	#include "common/input_pico.h"
	22	#include "common/version.h"
	23	#include "libretro.h"
	24
8c8b7284	25	#ifndef MAP_ANONYMOUS
	26	#define MAP_ANONYMOUS MAP_ANON
	27	#endif
	28
2446536b	29	static retro_video_refresh_t video_cb;
	30	static retro_input_poll_t input_poll_cb;
	31	static retro_input_state_t input_state_cb;
	32	static retro_environment_t environ_cb;
	33	static retro_audio_sample_batch_t audio_batch_cb;
	34
	35	static FILE *emu_log;
	36
	37	#define VOUT_MAX_WIDTH 320
	38	#define VOUT_MAX_HEIGHT 240
	39	static void *vout_buf;
	40	static int vout_width, vout_height;
	41
	42	static short __attribute__((aligned(4))) sndBuffer[2*44100/50];
	43
2446536b	44	static void snd_write(int len);
	45
	46	#ifdef _WIN32
	47	#define SLASH '\\'
	48	#else
	49	#define SLASH '/'
	50	#endif
	51
	52	/* functions called by the core */
	53
	54	void cache_flush_d_inval_i(void start, void end)
	55	{
	56	#ifdef __arm__
	57	#if defined(__BLACKBERRY_QNX__)
	58	msync(start, end - start, MS_SYNC \| MS_CACHE_ONLY \| MS_INVALIDATE_ICACHE);
	59	#elif defined(__MACH__)
	60	size_t len = (char )end - (char )start;
	61	sys_dcache_flush(start, len);
	62	sys_icache_invalidate(start, len);
	63	#else
	64	__clear_cache(start, end);
	65	#endif
	66	#endif
	67	}
	68
	69	void *plat_mmap(unsigned long addr, size_t size, int need_exec, int is_fixed)
	70	{
	71	int flags = MAP_PRIVATE \| MAP_ANONYMOUS;
	72	void req, ret;
	73
	74	req = (void *)addr;
	75	ret = mmap(req, size, PROT_READ \| PROT_WRITE, flags, -1, 0);
c25d78ee	76	if (ret == MAP_FAILED) {
c25d78ee	77	lprintf("mmap(%08lx, %zd) failed: %d\n", addr, size, errno);
2446536b	78	return NULL;
c25d78ee	79	}
2446536b	80
	81	if (addr != 0 && ret != (void *)addr) {
	82	lprintf("warning: wanted to map @%08lx, got %p\n",
	83	addr, ret);
	84
	85	if (is_fixed) {
	86	munmap(ret, size);
	87	return NULL;
	88	}
	89	}
	90
	91	return ret;
	92	}
	93
	94	void plat_mremap(void ptr, size_t oldsize, size_t newsize)
	95	{
8c8b7284	96	#ifdef __linux__
2446536b	97	void *ret = mremap(ptr, oldsize, newsize, 0);
	98	if (ret == MAP_FAILED)
	99	return NULL;
	100
	101	return ret;
8c8b7284	102	#else
	103	void tmp, ret;
	104	size_t preserve_size;
	105
	106	preserve_size = oldsize;
	107	if (preserve_size > newsize)
	108	preserve_size = newsize;
	109	tmp = malloc(preserve_size);
	110	if (tmp == NULL)
	111	return NULL;
	112	memcpy(tmp, ptr, preserve_size);
	113
	114	munmap(ptr, oldsize);
	115	ret = mmap(ptr, newsize, PROT_READ \| PROT_WRITE,
	116	MAP_PRIVATE \| MAP_ANONYMOUS, -1, 0);
	117	if (ret == MAP_FAILED) {
	118	free(tmp);
	119	return NULL;
	120	}
	121	memcpy(ret, tmp, preserve_size);
	122	free(tmp);
	123	return ret;
	124	#endif
2446536b	125	}
	126
	127	void plat_munmap(void *ptr, size_t size)
	128	{
	129	if (ptr != NULL)
	130	munmap(ptr, size);
	131	}
	132
c25d78ee	133	int plat_mem_set_exec(void *ptr, size_t size)
	134	{
	135	int ret = mprotect(ptr, size, PROT_READ \| PROT_WRITE \| PROT_EXEC);
	136	if (ret != 0)
	137	lprintf("mprotect(%p, %zd) failed: %d\n", ptr, size, errno);
	138
	139	return ret;
	140	}
	141
2446536b	142	void emu_video_mode_change(int start_line, int line_count, int is_32cols)
	143	{
	144	memset(vout_buf, 0, 320 * 240 * 2);
	145	vout_width = is_32cols ? 256 : 320;
	146	PicoDrawSetOutBuf(vout_buf, vout_width * 2);
	147	}
	148
	149	void emu_32x_startup(void)
	150	{
2446536b	151	}
	152
	153	#ifndef ANDROID
	154
	155	void lprintf(const char *fmt, ...)
	156	{
	157	va_list list;
	158
	159	va_start(list, fmt);
	160	fprintf(emu_log, "PicoDrive: ");
	161	vfprintf(emu_log, fmt, list);
	162	va_end(list);
	163	fflush(emu_log);
	164	}
	165
	166	#else
	167
	168	#include <android/log.h>
	169
	170	void lprintf(const char *fmt, ...)
	171	{
	172	va_list list;
	173
	174	va_start(list, fmt);
	175	__android_log_vprint(ANDROID_LOG_INFO, "PicoDrive", fmt, list);
	176	va_end(list);
	177	}
	178
	179	#endif
	180
	181	/* libretro */
	182	void retro_set_environment(retro_environment_t cb)
	183	{
	184	static const struct retro_variable vars[] = {
	185	//{ "region", "Region; Auto\|NTSC\|PAL" },
531a8f38	186	{ "picodrive_input1", "Input device 1; 3 button pad\|6 button pad\|None" },
531a8f38	187	{ "picodrive_input2", "Input device 2; 3 button pad\|6 button pad\|None" },
0185b677	188	#ifdef DRC_SH2
	189	{ "picodrive_drc", "Dynamic recompilers; enabled\|disabled" },
	190	#endif
2446536b	191	{ NULL, NULL },
	192	};
	193
	194	environ_cb = cb;
	195
	196	cb(RETRO_ENVIRONMENT_SET_VARIABLES, (void *)vars);
	197	}
	198
	199	void retro_set_video_refresh(retro_video_refresh_t cb) { video_cb = cb; }
	200	void retro_set_audio_sample(retro_audio_sample_t cb) { (void)cb; }
	201	void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb) { audio_batch_cb = cb; }
	202	void retro_set_input_poll(retro_input_poll_t cb) { input_poll_cb = cb; }
	203	void retro_set_input_state(retro_input_state_t cb) { input_state_cb = cb; }
	204
	205	unsigned retro_api_version(void)
	206	{
	207	return RETRO_API_VERSION;
	208	}
	209
	210	void retro_set_controller_port_device(unsigned port, unsigned device)
	211	{
	212	}
	213
	214	void retro_get_system_info(struct retro_system_info *info)
	215	{
	216	memset(info, 0, sizeof(*info));
	217	info->library_name = "PicoDrive";
	218	info->library_version = VERSION;
53b2e51c	219	info->valid_extensions = "bin\|gen\|smd\|md\|32x\|cue\|iso\|sms";
2446536b	220	info->need_fullpath = true;
	221	}
	222
	223	void retro_get_system_av_info(struct retro_system_av_info *info)
	224	{
	225	memset(info, 0, sizeof(*info));
	226	info->timing.fps = Pico.m.pal ? 50 : 60;
	227	info->timing.sample_rate = 44100;
	228	info->geometry.base_width = 320;
	229	info->geometry.base_height = 240;
	230	info->geometry.max_width = VOUT_MAX_WIDTH;
	231	info->geometry.max_height = VOUT_MAX_HEIGHT;
	232	info->geometry.aspect_ratio = 4.0 / 3.0;
	233	}
	234
86b38dc4	235	/* savestates */
	236	struct savestate_state {
	237	const char *load_buf;
	238	char *save_buf;
	239	size_t size;
	240	size_t pos;
	241	};
	242
	243	size_t state_read(void p, size_t size, size_t nmemb, void file)
	244	{
	245	struct savestate_state *state = file;
	246	size_t bsize = size * nmemb;
	247
	248	if (state->pos + bsize > state->size) {
	249	lprintf("savestate error: %u/%u\n",
	250	state->pos + bsize, state->size);
	251	bsize = state->size - state->pos;
	252	if ((int)bsize <= 0)
	253	return 0;
	254	}
	255
	256	memcpy(p, state->load_buf + state->pos, bsize);
	257	state->pos += bsize;
	258	return bsize;
	259	}
	260
	261	size_t state_write(void p, size_t size, size_t nmemb, void file)
	262	{
	263	struct savestate_state *state = file;
	264	size_t bsize = size * nmemb;
	265
	266	if (state->pos + bsize > state->size) {
	267	lprintf("savestate error: %u/%u\n",
	268	state->pos + bsize, state->size);
	269	bsize = state->size - state->pos;
	270	if ((int)bsize <= 0)
	271	return 0;
	272	}
	273
	274	memcpy(state->save_buf + state->pos, p, bsize);
	275	state->pos += bsize;
	276	return bsize;
	277	}
	278
	279	size_t state_skip(void p, size_t size, size_t nmemb, void file)
	280	{
	281	struct savestate_state *state = file;
	282	size_t bsize = size * nmemb;
	283
	284	state->pos += bsize;
	285	return bsize;
	286	}
	287
	288	size_t state_eof(void *file)
	289	{
	290	struct savestate_state *state = file;
	291
	292	return state->pos >= state->size;
	293	}
	294
	295	int state_fseek(void *file, long offset, int whence)
	296	{
	297	struct savestate_state *state = file;
	298
299	switch (whence) {
300	case SEEK_SET:
301	state->pos = offset;
302	break;
303	case SEEK_CUR:
304	state->pos += offset;
305	break;
306	case SEEK_END:
307	state->pos = state->size + offset;
308	break;
309	}
310	return (int)state->pos;
311	}
312
313	/* savestate sizes vary wildly depending if cd/32x or
314	* carthw is active, so run the whole thing to get size */
2446536b	315	size_t retro_serialize_size(void)
2446536b	316	{
86b38dc4	317	struct savestate_state state = { 0, };
	318	int ret;
	319
	320	ret = PicoStateFP(&state, 1, NULL, state_skip, NULL, state_fseek);
	321	if (ret != 0)
	322	return 0;
	323
	324	return state.pos;
2446536b	325	}
	326
	327	bool retro_serialize(void *data, size_t size)
	328	{
86b38dc4	329	struct savestate_state state = { 0, };
	330	int ret;
	331
	332	state.save_buf = data;
	333	state.size = size;
	334	state.pos = 0;
	335
	336	ret = PicoStateFP(&state, 1, NULL, state_write,
	337	NULL, state_fseek);
	338	return ret == 0;
2446536b	339	}
	340
	341	bool retro_unserialize(const void *data, size_t size)
	342	{
86b38dc4	343	struct savestate_state state = { 0, };
	344	int ret;
	345
	346	state.load_buf = data;
	347	state.size = size;
	348	state.pos = 0;
	349
	350	ret = PicoStateFP(&state, 0, state_read, NULL,
	351	state_eof, state_fseek);
	352	return ret == 0;
2446536b	353	}
	354
	355	/* cheats - TODO */
	356	void retro_cheat_reset(void)
	357	{
	358	}
	359
	360	void retro_cheat_set(unsigned index, bool enabled, const char *code)
	361	{
	362	}
	363
	364	/* multidisk support */
	365	static bool disk_ejected;
	366	static unsigned int disk_current_index;
	367	static unsigned int disk_count;
	368	static struct disks_state {
	369	char *fname;
	370	} disks[8];
	371
	372	static bool disk_set_eject_state(bool ejected)
	373	{
	374	// TODO?
	375	disk_ejected = ejected;
	376	return true;
	377	}
	378
	379	static bool disk_get_eject_state(void)
	380	{
	381	return disk_ejected;
	382	}
	383
	384	static unsigned int disk_get_image_index(void)
	385	{
	386	return disk_current_index;
	387	}
	388
	389	static bool disk_set_image_index(unsigned int index)
	390	{
	391	cd_img_type cd_type;
	392	int ret;
	393
	394	if (index >= sizeof(disks) / sizeof(disks[0]))
	395	return false;
	396
	397	if (disks[index].fname == NULL) {
	398	lprintf("missing disk #%u\n", index);
	399
	400	// RetroArch specifies "no disk" with index == count,
	401	// so don't fail here..
	402	disk_current_index = index;
	403	return true;
	404	}
	405
	406	lprintf("switching to disk %u: \"%s\"\n", index,
	407	disks[index].fname);
	408
	409	ret = -1;
	410	cd_type = PicoCdCheck(disks[index].fname, NULL);
	411	if (cd_type != CIT_NOT_CD)
	412	ret = Insert_CD(disks[index].fname, cd_type);
	413	if (ret != 0) {
	414	lprintf("Load failed, invalid CD image?\n");
	415	return 0;
	416	}
417
418	disk_current_index = index;
419	return true;
420	}
421
422	static unsigned int disk_get_num_images(void)
423	{
424	return disk_count;
425	}
426
427	static bool disk_replace_image_index(unsigned index,
428	const struct retro_game_info *info)
429	{
430	bool ret = true;
431
432	if (index >= sizeof(disks) / sizeof(disks[0]))
433	return false;
434
435	if (disks[index].fname != NULL)
436	free(disks[index].fname);
437	disks[index].fname = NULL;
438
439	if (info != NULL) {
440	disks[index].fname = strdup(info->path);
441	if (index == disk_current_index)
442	ret = disk_set_image_index(index);
443	}
444
445	return ret;
446	}
447
448	static bool disk_add_image_index(void)
449	{
450	if (disk_count >= sizeof(disks) / sizeof(disks[0]))
451	return false;
452
453	disk_count++;
454	return true;
455	}
456
457	static struct retro_disk_control_callback disk_control = {
458	.set_eject_state = disk_set_eject_state,
459	.get_eject_state = disk_get_eject_state,
460	.get_image_index = disk_get_image_index,
461	.set_image_index = disk_set_image_index,
462	.get_num_images = disk_get_num_images,
463	.replace_image_index = disk_replace_image_index,
464	.add_image_index = disk_add_image_index,
465	};
466
467	static void disk_tray_open(void)
468	{
469	lprintf("cd tray open\n");
470	disk_ejected = 1;
471	}
472
473	static void disk_tray_close(void)
474	{
475	lprintf("cd tray close\n");
476	disk_ejected = 0;
477	}
478
479
480	static const char * const biosfiles_us[] = {
481	"us_scd1_9210", "us_scd2_9306", "SegaCDBIOS9303", "bios_CD_U"
482	};
483	static const char * const biosfiles_eu[] = {
484	"eu_mcd1_9210", "eu_mcd2_9306", "eu_mcd2_9303", "bios_CD_E"
485	};
486	static const char * const biosfiles_jp[] = {
487	"jp_mcd1_9112", "jp_mcd1_9111", "bios_CD_J"
488	};
489
490	static void make_system_path(char *buf, size_t buf_size,
491	const char name, const char ext)
492	{
493	const char *dir = NULL;
494
495	if (environ_cb(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &dir) && dir) {
496	snprintf(buf, buf_size, "%s%c%s%s", dir, SLASH, name, ext);
497	}
498	else {
499	snprintf(buf, buf_size, "%s%s", name, ext);
500	}
501	}
502
503	static const char find_bios(int region, const char *cd_fname)
504	{
505	const char * const *files;
506	static char path[256];
507	int i, count;
508	FILE *f = NULL;
509
510	if (*region == 4) { // US
511	files = biosfiles_us;
512	count = sizeof(biosfiles_us) / sizeof(char *);
513	} else if (*region == 8) { // EU
514	files = biosfiles_eu;
515	count = sizeof(biosfiles_eu) / sizeof(char *);
516	} else if (region == 1 \|\| region == 2) {
517	files = biosfiles_jp;
518	count = sizeof(biosfiles_jp) / sizeof(char *);
519	} else {
520	return NULL;
521	}
522
523	for (i = 0; i < count; i++)
524	{
525	make_system_path(path, sizeof(path), files[i], ".bin");
526	f = fopen(path, "rb");
527	if (f != NULL)
528	break;
529
530	make_system_path(path, sizeof(path), files[i], ".zip");
531	f = fopen(path, "rb");
532	if (f != NULL)
533	break;
534	}
535
536	if (f != NULL) {
537	lprintf("using bios: %s\n", path);
538	fclose(f);
539	return path;
540	}
541
542	return NULL;
543	}
544
545	bool retro_load_game(const struct retro_game_info *info)
546	{
547	enum media_type_e media_type;
548	static char carthw_path[256];
549	size_t i;
550
551	enum retro_pixel_format fmt = RETRO_PIXEL_FORMAT_RGB565;
552	if (!environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt)) {
531a8f38	553	lprintf("RGB565 support required, sorry\n");
2446536b	554	return false;
	555	}
	556
	557	if (info == NULL \|\| info->path == NULL) {
	558	lprintf("info->path required\n");
	559	return false;
	560	}
	561
	562	for (i = 0; i < sizeof(disks) / sizeof(disks[0]); i++) {
	563	if (disks[i].fname != NULL) {
	564	free(disks[i].fname);
	565	disks[i].fname = NULL;
	566	}
	567	}
	568
	569	disk_current_index = 0;
	570	disk_count = 1;
	571	disks[0].fname = strdup(info->path);
	572
	573	make_system_path(carthw_path, sizeof(carthw_path), "carthw", ".cfg");
	574
	575	media_type = PicoLoadMedia(info->path, carthw_path,
	576	find_bios, NULL);
	577
	578	switch (media_type) {
	579	case PM_BAD_DETECT:
	580	lprintf("Failed to detect ROM/CD image type.\n");
	581	return false;
	582	case PM_BAD_CD:
	583	lprintf("Invalid CD image\n");
	584	return false;
	585	case PM_BAD_CD_NO_BIOS:
	586	lprintf("Missing BIOS\n");
	587	return false;
	588	case PM_ERROR:
	589	lprintf("Load error\n");
	590	return false;
	591	default:
	592	break;
	593	}
	594
	595	PicoLoopPrepare();
	596
	597	PicoWriteSound = snd_write;
	598	memset(sndBuffer, 0, sizeof(sndBuffer));
	599	PsndOut = sndBuffer;
	600	PsndRerate(1);
	601
	602	return true;
	603	}
	604
	605	bool retro_load_game_special(unsigned game_type, const struct retro_game_info *info, size_t num_info)
	606	{
	607	return false;
	608	}
	609
	610	void retro_unload_game(void)
	611	{
	612	}
	613
	614	unsigned retro_get_region(void)
	615	{
	616	return Pico.m.pal ? RETRO_REGION_PAL : RETRO_REGION_NTSC;
	617	}
618
619	void *retro_get_memory_data(unsigned id)
620	{
621	if (id != RETRO_MEMORY_SAVE_RAM)
622	return NULL;
623
624	if (PicoAHW & PAHW_MCD)
625	return Pico_mcd->bram;
626	else
627	return SRam.data;
628	}
629
630	size_t retro_get_memory_size(unsigned id)
631	{
632	if (id != RETRO_MEMORY_SAVE_RAM)
633	return 0;
634
635	if (PicoAHW & PAHW_MCD)
636	// bram
637	return 0x2000;
638	else
639	return SRam.size;
640	}
641
642	void retro_reset(void)
643	{
644	PicoReset();
645	}
646
647	static const unsigned short retro_pico_map[] = {
648	[RETRO_DEVICE_ID_JOYPAD_B] = 1 << GBTN_B,
649	[RETRO_DEVICE_ID_JOYPAD_Y] = 1 << GBTN_A,
650	[RETRO_DEVICE_ID_JOYPAD_SELECT] = 1 << GBTN_MODE,
651	[RETRO_DEVICE_ID_JOYPAD_START] = 1 << GBTN_START,
652	[RETRO_DEVICE_ID_JOYPAD_UP] = 1 << GBTN_UP,
653	[RETRO_DEVICE_ID_JOYPAD_DOWN] = 1 << GBTN_DOWN,
654	[RETRO_DEVICE_ID_JOYPAD_LEFT] = 1 << GBTN_LEFT,
655	[RETRO_DEVICE_ID_JOYPAD_RIGHT] = 1 << GBTN_RIGHT,
656	[RETRO_DEVICE_ID_JOYPAD_A] = 1 << GBTN_C,
657	[RETRO_DEVICE_ID_JOYPAD_X] = 1 << GBTN_Y,
658	[RETRO_DEVICE_ID_JOYPAD_L] = 1 << GBTN_X,
659	[RETRO_DEVICE_ID_JOYPAD_R] = 1 << GBTN_Z,
660	};
661	#define RETRO_PICO_MAP_LEN (sizeof(retro_pico_map) / sizeof(retro_pico_map[0]))
662
663	static void snd_write(int len)
664	{
665	audio_batch_cb(PsndOut, len / 4);
666	}
667
531a8f38	668	static enum input_device input_name_to_val(const char *name)
	669	{
	670	if (strcmp(name, "3 button pad") == 0)
	671	return PICO_INPUT_PAD_3BTN;
	672	if (strcmp(name, "6 button pad") == 0)
	673	return PICO_INPUT_PAD_6BTN;
	674	if (strcmp(name, "None") == 0)
	675	return PICO_INPUT_NOTHING;
	676
	677	lprintf("invalid picodrive_input: '%s'\n", name);
	678	return PICO_INPUT_PAD_3BTN;
	679	}
	680
	681	static void update_variables(void)
	682	{
	683	struct retro_variable var;
	684
	685	var.value = NULL;
	686	var.key = "picodrive_input1";
	687	if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
	688	PicoSetInputDevice(0, input_name_to_val(var.value));
	689
	690	var.value = NULL;
	691	var.key = "picodrive_input2";
	692	if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
	693	PicoSetInputDevice(1, input_name_to_val(var.value));
0185b677	694
	695	#ifdef DRC_SH2
	696	var.value = NULL;
	697	var.key = "picodrive_drc";
	698	if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
	699	if (strcmp(var.value, "enabled") == 0)
	700	PicoOpt \|= POPT_EN_DRC;
	701	else
	702	PicoOpt &= ~POPT_EN_DRC;
	703	}
	704	#endif
531a8f38	705	}
531a8f38	706
2446536b	707	void retro_run(void)
	708	{
	709	bool updated = false;
	710	int pad, i;
	711
	712	if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
531a8f38	713	update_variables();
2446536b	714
	715	input_poll_cb();
	716
	717	PicoPad[0] = PicoPad[1] = 0;
	718	for (pad = 0; pad < 2; pad++)
	719	for (i = 0; i < RETRO_PICO_MAP_LEN; i++)
	720	if (input_state_cb(pad, RETRO_DEVICE_JOYPAD, 0, i))
	721	PicoPad[pad] \|= retro_pico_map[i];
	722
	723	PicoFrame();
	724
	725	video_cb(vout_buf, vout_width, vout_height, vout_width * 2);
	726	}
	727
	728	void retro_init(void)
	729	{
	730	int level;
	731
	732	#ifdef IOS
	733	emu_log = fopen("/User/Documents/PicoDrive.log", "w");
	734	if (emu_log == NULL)
	735	emu_log = fopen("PicoDrive.log", "w");
	736	if (emu_log == NULL)
	737	#endif
	738	emu_log = stdout;
	739
	740	level = 0;
	741	environ_cb(RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL, &level);
	742
	743	environ_cb(RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE, &disk_control);
	744
	745	PicoOpt = POPT_EN_STEREO\|POPT_EN_FM\|POPT_EN_PSG\|POPT_EN_Z80
720bfc5d	746	\| POPT_EN_MCD_PCM\|POPT_EN_MCD_CDDA\|POPT_EN_MCD_GFX
	747	\| POPT_EN_32X\|POPT_EN_PWM
	748	\| POPT_ACC_SPRITES\|POPT_DIS_32C_BORDER;
	749	#ifdef __arm__
	750	PicoOpt \|= POPT_EN_SVP_DRC;
	751	#endif
2446536b	752	PsndRate = 44100;
	753	PicoAutoRgnOrder = 0x184; // US, EU, JP
	754	PicoCDBuffers = 0;
	755
2446536b	756	vout_width = 320;
	757	vout_height = 240;
	758	vout_buf = malloc(VOUT_MAX_WIDTH * VOUT_MAX_HEIGHT * 2);
	759
	760	PicoInit();
41946d70	761	PicoDrawSetOutFormat(PDF_RGB555, 0);
2446536b	762	PicoDrawSetOutBuf(vout_buf, vout_width * 2);
	763
	764	//PicoMessage = plat_status_msg_busy_next;
	765	PicoMCDopenTray = disk_tray_open;
	766	PicoMCDcloseTray = disk_tray_close;
531a8f38	767
531a8f38	768	update_variables();
2446536b	769	}
	770
	771	void retro_deinit(void)
	772	{
	773	PicoExit();
	774	}