[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" },
		{ 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));
}

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" },
2446536b	188	{ NULL, NULL },
	189	};
	190
	191	environ_cb = cb;
	192
	193	cb(RETRO_ENVIRONMENT_SET_VARIABLES, (void *)vars);
	194	}
	195
	196	void retro_set_video_refresh(retro_video_refresh_t cb) { video_cb = cb; }
	197	void retro_set_audio_sample(retro_audio_sample_t cb) { (void)cb; }
	198	void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb) { audio_batch_cb = cb; }
	199	void retro_set_input_poll(retro_input_poll_t cb) { input_poll_cb = cb; }
	200	void retro_set_input_state(retro_input_state_t cb) { input_state_cb = cb; }
	201
	202	unsigned retro_api_version(void)
	203	{
	204	return RETRO_API_VERSION;
	205	}
	206
	207	void retro_set_controller_port_device(unsigned port, unsigned device)
	208	{
	209	}
	210
	211	void retro_get_system_info(struct retro_system_info *info)
	212	{
	213	memset(info, 0, sizeof(*info));
	214	info->library_name = "PicoDrive";
	215	info->library_version = VERSION;
53b2e51c	216	info->valid_extensions = "bin\|gen\|smd\|md\|32x\|cue\|iso\|sms";
2446536b	217	info->need_fullpath = true;
	218	}
	219
	220	void retro_get_system_av_info(struct retro_system_av_info *info)
	221	{
	222	memset(info, 0, sizeof(*info));
	223	info->timing.fps = Pico.m.pal ? 50 : 60;
	224	info->timing.sample_rate = 44100;
	225	info->geometry.base_width = 320;
	226	info->geometry.base_height = 240;
	227	info->geometry.max_width = VOUT_MAX_WIDTH;
	228	info->geometry.max_height = VOUT_MAX_HEIGHT;
	229	info->geometry.aspect_ratio = 4.0 / 3.0;
	230	}
	231
86b38dc4	232	/* savestates */
	233	struct savestate_state {
	234	const char *load_buf;
	235	char *save_buf;
	236	size_t size;
	237	size_t pos;
	238	};
	239
	240	size_t state_read(void p, size_t size, size_t nmemb, void file)
	241	{
	242	struct savestate_state *state = file;
	243	size_t bsize = size * nmemb;
	244
	245	if (state->pos + bsize > state->size) {
	246	lprintf("savestate error: %u/%u\n",
	247	state->pos + bsize, state->size);
	248	bsize = state->size - state->pos;
	249	if ((int)bsize <= 0)
	250	return 0;
	251	}
	252
	253	memcpy(p, state->load_buf + state->pos, bsize);
	254	state->pos += bsize;
	255	return bsize;
	256	}
	257
	258	size_t state_write(void p, size_t size, size_t nmemb, void file)
	259	{
	260	struct savestate_state *state = file;
	261	size_t bsize = size * nmemb;
	262
	263	if (state->pos + bsize > state->size) {
	264	lprintf("savestate error: %u/%u\n",
	265	state->pos + bsize, state->size);
	266	bsize = state->size - state->pos;
	267	if ((int)bsize <= 0)
	268	return 0;
	269	}
	270
	271	memcpy(state->save_buf + state->pos, p, bsize);
	272	state->pos += bsize;
	273	return bsize;
	274	}
	275
	276	size_t state_skip(void p, size_t size, size_t nmemb, void file)
	277	{
	278	struct savestate_state *state = file;
	279	size_t bsize = size * nmemb;
	280
	281	state->pos += bsize;
	282	return bsize;
	283	}
	284
	285	size_t state_eof(void *file)
	286	{
	287	struct savestate_state *state = file;
	288
	289	return state->pos >= state->size;
	290	}
	291
	292	int state_fseek(void *file, long offset, int whence)
	293	{
	294	struct savestate_state *state = file;
	295
296	switch (whence) {
297	case SEEK_SET:
298	state->pos = offset;
299	break;
300	case SEEK_CUR:
301	state->pos += offset;
302	break;
303	case SEEK_END:
304	state->pos = state->size + offset;
305	break;
306	}
307	return (int)state->pos;
308	}
309
310	/* savestate sizes vary wildly depending if cd/32x or
311	* carthw is active, so run the whole thing to get size */
2446536b	312	size_t retro_serialize_size(void)
2446536b	313	{
86b38dc4	314	struct savestate_state state = { 0, };
	315	int ret;
	316
	317	ret = PicoStateFP(&state, 1, NULL, state_skip, NULL, state_fseek);
	318	if (ret != 0)
	319	return 0;
	320
	321	return state.pos;
2446536b	322	}
	323
	324	bool retro_serialize(void *data, size_t size)
	325	{
86b38dc4	326	struct savestate_state state = { 0, };
	327	int ret;
	328
	329	state.save_buf = data;
	330	state.size = size;
	331	state.pos = 0;
	332
	333	ret = PicoStateFP(&state, 1, NULL, state_write,
	334	NULL, state_fseek);
	335	return ret == 0;
2446536b	336	}
	337
	338	bool retro_unserialize(const void *data, size_t size)
	339	{
86b38dc4	340	struct savestate_state state = { 0, };
	341	int ret;
	342
	343	state.load_buf = data;
	344	state.size = size;
	345	state.pos = 0;
	346
	347	ret = PicoStateFP(&state, 0, state_read, NULL,
	348	state_eof, state_fseek);
	349	return ret == 0;
2446536b	350	}
	351
	352	/* cheats - TODO */
	353	void retro_cheat_reset(void)
	354	{
	355	}
	356
	357	void retro_cheat_set(unsigned index, bool enabled, const char *code)
	358	{
	359	}
	360
	361	/* multidisk support */
	362	static bool disk_ejected;
	363	static unsigned int disk_current_index;
	364	static unsigned int disk_count;
	365	static struct disks_state {
	366	char *fname;
	367	} disks[8];
	368
	369	static bool disk_set_eject_state(bool ejected)
	370	{
	371	// TODO?
	372	disk_ejected = ejected;
	373	return true;
	374	}
	375
	376	static bool disk_get_eject_state(void)
	377	{
	378	return disk_ejected;
	379	}
	380
	381	static unsigned int disk_get_image_index(void)
	382	{
	383	return disk_current_index;
	384	}
	385
	386	static bool disk_set_image_index(unsigned int index)
	387	{
	388	cd_img_type cd_type;
	389	int ret;
	390
	391	if (index >= sizeof(disks) / sizeof(disks[0]))
	392	return false;
	393
	394	if (disks[index].fname == NULL) {
	395	lprintf("missing disk #%u\n", index);
	396
	397	// RetroArch specifies "no disk" with index == count,
	398	// so don't fail here..
	399	disk_current_index = index;
	400	return true;
	401	}
	402
	403	lprintf("switching to disk %u: \"%s\"\n", index,
	404	disks[index].fname);
	405
	406	ret = -1;
	407	cd_type = PicoCdCheck(disks[index].fname, NULL);
	408	if (cd_type != CIT_NOT_CD)
	409	ret = Insert_CD(disks[index].fname, cd_type);
	410	if (ret != 0) {
	411	lprintf("Load failed, invalid CD image?\n");
	412	return 0;
	413	}
414
415	disk_current_index = index;
416	return true;
417	}
418
419	static unsigned int disk_get_num_images(void)
420	{
421	return disk_count;
422	}
423
424	static bool disk_replace_image_index(unsigned index,
425	const struct retro_game_info *info)
426	{
427	bool ret = true;
428
429	if (index >= sizeof(disks) / sizeof(disks[0]))
430	return false;
431
432	if (disks[index].fname != NULL)
433	free(disks[index].fname);
434	disks[index].fname = NULL;
435
436	if (info != NULL) {
437	disks[index].fname = strdup(info->path);
438	if (index == disk_current_index)
439	ret = disk_set_image_index(index);
440	}
441
442	return ret;
443	}
444
445	static bool disk_add_image_index(void)
446	{
447	if (disk_count >= sizeof(disks) / sizeof(disks[0]))
448	return false;
449
450	disk_count++;
451	return true;
452	}
453
454	static struct retro_disk_control_callback disk_control = {
455	.set_eject_state = disk_set_eject_state,
456	.get_eject_state = disk_get_eject_state,
457	.get_image_index = disk_get_image_index,
458	.set_image_index = disk_set_image_index,
459	.get_num_images = disk_get_num_images,
460	.replace_image_index = disk_replace_image_index,
461	.add_image_index = disk_add_image_index,
462	};
463
464	static void disk_tray_open(void)
465	{
466	lprintf("cd tray open\n");
467	disk_ejected = 1;
468	}
469
470	static void disk_tray_close(void)
471	{
472	lprintf("cd tray close\n");
473	disk_ejected = 0;
474	}
475
476
477	static const char * const biosfiles_us[] = {
478	"us_scd1_9210", "us_scd2_9306", "SegaCDBIOS9303", "bios_CD_U"
479	};
480	static const char * const biosfiles_eu[] = {
481	"eu_mcd1_9210", "eu_mcd2_9306", "eu_mcd2_9303", "bios_CD_E"
482	};
483	static const char * const biosfiles_jp[] = {
484	"jp_mcd1_9112", "jp_mcd1_9111", "bios_CD_J"
485	};
486
487	static void make_system_path(char *buf, size_t buf_size,
488	const char name, const char ext)
489	{
490	const char *dir = NULL;
491
492	if (environ_cb(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &dir) && dir) {
493	snprintf(buf, buf_size, "%s%c%s%s", dir, SLASH, name, ext);
494	}
495	else {
496	snprintf(buf, buf_size, "%s%s", name, ext);
497	}
498	}
499
500	static const char find_bios(int region, const char *cd_fname)
501	{
502	const char * const *files;
503	static char path[256];
504	int i, count;
505	FILE *f = NULL;
506
507	if (*region == 4) { // US
508	files = biosfiles_us;
509	count = sizeof(biosfiles_us) / sizeof(char *);
510	} else if (*region == 8) { // EU
511	files = biosfiles_eu;
512	count = sizeof(biosfiles_eu) / sizeof(char *);
513	} else if (region == 1 \|\| region == 2) {
514	files = biosfiles_jp;
515	count = sizeof(biosfiles_jp) / sizeof(char *);
516	} else {
517	return NULL;
518	}
519
520	for (i = 0; i < count; i++)
521	{
522	make_system_path(path, sizeof(path), files[i], ".bin");
523	f = fopen(path, "rb");
524	if (f != NULL)
525	break;
526
527	make_system_path(path, sizeof(path), files[i], ".zip");
528	f = fopen(path, "rb");
529	if (f != NULL)
530	break;
531	}
532
533	if (f != NULL) {
534	lprintf("using bios: %s\n", path);
535	fclose(f);
536	return path;
537	}
538
539	return NULL;
540	}
541
542	bool retro_load_game(const struct retro_game_info *info)
543	{
544	enum media_type_e media_type;
545	static char carthw_path[256];
546	size_t i;
547
548	enum retro_pixel_format fmt = RETRO_PIXEL_FORMAT_RGB565;
549	if (!environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt)) {
531a8f38	550	lprintf("RGB565 support required, sorry\n");
2446536b	551	return false;
	552	}
	553
	554	if (info == NULL \|\| info->path == NULL) {
	555	lprintf("info->path required\n");
	556	return false;
	557	}
	558
	559	for (i = 0; i < sizeof(disks) / sizeof(disks[0]); i++) {
	560	if (disks[i].fname != NULL) {
	561	free(disks[i].fname);
	562	disks[i].fname = NULL;
	563	}
	564	}
	565
	566	disk_current_index = 0;
	567	disk_count = 1;
	568	disks[0].fname = strdup(info->path);
	569
	570	make_system_path(carthw_path, sizeof(carthw_path), "carthw", ".cfg");
	571
	572	media_type = PicoLoadMedia(info->path, carthw_path,
	573	find_bios, NULL);
	574
	575	switch (media_type) {
	576	case PM_BAD_DETECT:
	577	lprintf("Failed to detect ROM/CD image type.\n");
	578	return false;
	579	case PM_BAD_CD:
	580	lprintf("Invalid CD image\n");
	581	return false;
	582	case PM_BAD_CD_NO_BIOS:
	583	lprintf("Missing BIOS\n");
	584	return false;
	585	case PM_ERROR:
	586	lprintf("Load error\n");
	587	return false;
	588	default:
	589	break;
	590	}
	591
	592	PicoLoopPrepare();
	593
	594	PicoWriteSound = snd_write;
	595	memset(sndBuffer, 0, sizeof(sndBuffer));
	596	PsndOut = sndBuffer;
	597	PsndRerate(1);
	598
	599	return true;
	600	}
	601
	602	bool retro_load_game_special(unsigned game_type, const struct retro_game_info *info, size_t num_info)
	603	{
	604	return false;
	605	}
	606
	607	void retro_unload_game(void)
	608	{
	609	}
	610
	611	unsigned retro_get_region(void)
	612	{
	613	return Pico.m.pal ? RETRO_REGION_PAL : RETRO_REGION_NTSC;
	614	}
615
616	void *retro_get_memory_data(unsigned id)
617	{
618	if (id != RETRO_MEMORY_SAVE_RAM)
619	return NULL;
620
621	if (PicoAHW & PAHW_MCD)
622	return Pico_mcd->bram;
623	else
624	return SRam.data;
625	}
626
627	size_t retro_get_memory_size(unsigned id)
628	{
629	if (id != RETRO_MEMORY_SAVE_RAM)
630	return 0;
631
632	if (PicoAHW & PAHW_MCD)
633	// bram
634	return 0x2000;
635	else
636	return SRam.size;
637	}
638
639	void retro_reset(void)
640	{
641	PicoReset();
642	}
643
644	static const unsigned short retro_pico_map[] = {
645	[RETRO_DEVICE_ID_JOYPAD_B] = 1 << GBTN_B,
646	[RETRO_DEVICE_ID_JOYPAD_Y] = 1 << GBTN_A,
647	[RETRO_DEVICE_ID_JOYPAD_SELECT] = 1 << GBTN_MODE,
648	[RETRO_DEVICE_ID_JOYPAD_START] = 1 << GBTN_START,
649	[RETRO_DEVICE_ID_JOYPAD_UP] = 1 << GBTN_UP,
650	[RETRO_DEVICE_ID_JOYPAD_DOWN] = 1 << GBTN_DOWN,
651	[RETRO_DEVICE_ID_JOYPAD_LEFT] = 1 << GBTN_LEFT,
652	[RETRO_DEVICE_ID_JOYPAD_RIGHT] = 1 << GBTN_RIGHT,
653	[RETRO_DEVICE_ID_JOYPAD_A] = 1 << GBTN_C,
654	[RETRO_DEVICE_ID_JOYPAD_X] = 1 << GBTN_Y,
655	[RETRO_DEVICE_ID_JOYPAD_L] = 1 << GBTN_X,
656	[RETRO_DEVICE_ID_JOYPAD_R] = 1 << GBTN_Z,
657	};
658	#define RETRO_PICO_MAP_LEN (sizeof(retro_pico_map) / sizeof(retro_pico_map[0]))
659
660	static void snd_write(int len)
661	{
662	audio_batch_cb(PsndOut, len / 4);
663	}
664
531a8f38	665	static enum input_device input_name_to_val(const char *name)
	666	{
	667	if (strcmp(name, "3 button pad") == 0)
	668	return PICO_INPUT_PAD_3BTN;
	669	if (strcmp(name, "6 button pad") == 0)
	670	return PICO_INPUT_PAD_6BTN;
	671	if (strcmp(name, "None") == 0)
	672	return PICO_INPUT_NOTHING;
	673
	674	lprintf("invalid picodrive_input: '%s'\n", name);
	675	return PICO_INPUT_PAD_3BTN;
	676	}
	677
	678	static void update_variables(void)
	679	{
	680	struct retro_variable var;
	681
	682	var.value = NULL;
	683	var.key = "picodrive_input1";
	684	if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
	685	PicoSetInputDevice(0, input_name_to_val(var.value));
	686
	687	var.value = NULL;
	688	var.key = "picodrive_input2";
	689	if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
	690	PicoSetInputDevice(1, input_name_to_val(var.value));
	691	}
	692
2446536b	693	void retro_run(void)
	694	{
	695	bool updated = false;
	696	int pad, i;
	697
	698	if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
531a8f38	699	update_variables();
2446536b	700
	701	input_poll_cb();
	702
	703	PicoPad[0] = PicoPad[1] = 0;
	704	for (pad = 0; pad < 2; pad++)
	705	for (i = 0; i < RETRO_PICO_MAP_LEN; i++)
	706	if (input_state_cb(pad, RETRO_DEVICE_JOYPAD, 0, i))
	707	PicoPad[pad] \|= retro_pico_map[i];
	708
	709	PicoFrame();
	710
	711	video_cb(vout_buf, vout_width, vout_height, vout_width * 2);
	712	}
	713
	714	void retro_init(void)
	715	{
	716	int level;
	717
	718	#ifdef IOS
	719	emu_log = fopen("/User/Documents/PicoDrive.log", "w");
	720	if (emu_log == NULL)
	721	emu_log = fopen("PicoDrive.log", "w");
	722	if (emu_log == NULL)
	723	#endif
	724	emu_log = stdout;
	725
	726	level = 0;
	727	environ_cb(RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL, &level);
	728
	729	environ_cb(RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE, &disk_control);
	730
	731	PicoOpt = POPT_EN_STEREO\|POPT_EN_FM\|POPT_EN_PSG\|POPT_EN_Z80
720bfc5d	732	\| POPT_EN_MCD_PCM\|POPT_EN_MCD_CDDA\|POPT_EN_MCD_GFX
	733	\| POPT_EN_32X\|POPT_EN_PWM
	734	\| POPT_ACC_SPRITES\|POPT_DIS_32C_BORDER;
	735	#ifdef __arm__
	736	PicoOpt \|= POPT_EN_SVP_DRC;
	737	#endif
2446536b	738	PsndRate = 44100;
	739	PicoAutoRgnOrder = 0x184; // US, EU, JP
	740	PicoCDBuffers = 0;
	741
2446536b	742	vout_width = 320;
	743	vout_height = 240;
	744	vout_buf = malloc(VOUT_MAX_WIDTH * VOUT_MAX_HEIGHT * 2);
	745
	746	PicoInit();
41946d70	747	PicoDrawSetOutFormat(PDF_RGB555, 0);
2446536b	748	PicoDrawSetOutBuf(vout_buf, vout_width * 2);
	749
	750	//PicoMessage = plat_status_msg_busy_next;
	751	PicoMCDopenTray = disk_tray_open;
	752	PicoMCDcloseTray = disk_tray_close;
531a8f38	753
531a8f38	754	update_variables();
2446536b	755	}
	756
	757	void retro_deinit(void)
	758	{
	759	PicoExit();
	760	}