[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" },
		{ 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 suppot 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);
}

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

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

	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;
}

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" },
	186	{ NULL, NULL },
	187	};
	188
	189	environ_cb = cb;
	190
	191	cb(RETRO_ENVIRONMENT_SET_VARIABLES, (void *)vars);
	192	}
	193
	194	void retro_set_video_refresh(retro_video_refresh_t cb) { video_cb = cb; }
	195	void retro_set_audio_sample(retro_audio_sample_t cb) { (void)cb; }
	196	void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb) { audio_batch_cb = cb; }
	197	void retro_set_input_poll(retro_input_poll_t cb) { input_poll_cb = cb; }
	198	void retro_set_input_state(retro_input_state_t cb) { input_state_cb = cb; }
	199
	200	unsigned retro_api_version(void)
	201	{
	202	return RETRO_API_VERSION;
	203	}
	204
	205	void retro_set_controller_port_device(unsigned port, unsigned device)
	206	{
	207	}
	208
	209	void retro_get_system_info(struct retro_system_info *info)
	210	{
	211	memset(info, 0, sizeof(*info));
	212	info->library_name = "PicoDrive";
	213	info->library_version = VERSION;
53b2e51c	214	info->valid_extensions = "bin\|gen\|smd\|md\|32x\|cue\|iso\|sms";
2446536b	215	info->need_fullpath = true;
	216	}
	217
	218	void retro_get_system_av_info(struct retro_system_av_info *info)
	219	{
	220	memset(info, 0, sizeof(*info));
	221	info->timing.fps = Pico.m.pal ? 50 : 60;
	222	info->timing.sample_rate = 44100;
	223	info->geometry.base_width = 320;
	224	info->geometry.base_height = 240;
	225	info->geometry.max_width = VOUT_MAX_WIDTH;
	226	info->geometry.max_height = VOUT_MAX_HEIGHT;
	227	info->geometry.aspect_ratio = 4.0 / 3.0;
	228	}
	229
86b38dc4	230	/* savestates */
	231	struct savestate_state {
	232	const char *load_buf;
	233	char *save_buf;
	234	size_t size;
	235	size_t pos;
	236	};
	237
	238	size_t state_read(void p, size_t size, size_t nmemb, void file)
	239	{
	240	struct savestate_state *state = file;
	241	size_t bsize = size * nmemb;
	242
	243	if (state->pos + bsize > state->size) {
	244	lprintf("savestate error: %u/%u\n",
	245	state->pos + bsize, state->size);
	246	bsize = state->size - state->pos;
	247	if ((int)bsize <= 0)
	248	return 0;
	249	}
	250
	251	memcpy(p, state->load_buf + state->pos, bsize);
	252	state->pos += bsize;
	253	return bsize;
	254	}
	255
	256	size_t state_write(void p, size_t size, size_t nmemb, void file)
	257	{
	258	struct savestate_state *state = file;
	259	size_t bsize = size * nmemb;
	260
	261	if (state->pos + bsize > state->size) {
	262	lprintf("savestate error: %u/%u\n",
	263	state->pos + bsize, state->size);
	264	bsize = state->size - state->pos;
	265	if ((int)bsize <= 0)
	266	return 0;
	267	}
	268
	269	memcpy(state->save_buf + state->pos, p, bsize);
	270	state->pos += bsize;
	271	return bsize;
	272	}
	273
	274	size_t state_skip(void p, size_t size, size_t nmemb, void file)
	275	{
	276	struct savestate_state *state = file;
	277	size_t bsize = size * nmemb;
	278
	279	state->pos += bsize;
	280	return bsize;
	281	}
	282
	283	size_t state_eof(void *file)
	284	{
	285	struct savestate_state *state = file;
	286
	287	return state->pos >= state->size;
	288	}
	289
	290	int state_fseek(void *file, long offset, int whence)
	291	{
	292	struct savestate_state *state = file;
	293
294	switch (whence) {
295	case SEEK_SET:
296	state->pos = offset;
297	break;
298	case SEEK_CUR:
299	state->pos += offset;
300	break;
301	case SEEK_END:
302	state->pos = state->size + offset;
303	break;
304	}
305	return (int)state->pos;
306	}
307
308	/* savestate sizes vary wildly depending if cd/32x or
309	* carthw is active, so run the whole thing to get size */
2446536b	310	size_t retro_serialize_size(void)
2446536b	311	{
86b38dc4	312	struct savestate_state state = { 0, };
	313	int ret;
	314
	315	ret = PicoStateFP(&state, 1, NULL, state_skip, NULL, state_fseek);
	316	if (ret != 0)
	317	return 0;
	318
	319	return state.pos;
2446536b	320	}
	321
	322	bool retro_serialize(void *data, size_t size)
	323	{
86b38dc4	324	struct savestate_state state = { 0, };
	325	int ret;
	326
	327	state.save_buf = data;
	328	state.size = size;
	329	state.pos = 0;
	330
	331	ret = PicoStateFP(&state, 1, NULL, state_write,
	332	NULL, state_fseek);
	333	return ret == 0;
2446536b	334	}
	335
	336	bool retro_unserialize(const void *data, size_t size)
	337	{
86b38dc4	338	struct savestate_state state = { 0, };
	339	int ret;
	340
	341	state.load_buf = data;
	342	state.size = size;
	343	state.pos = 0;
	344
	345	ret = PicoStateFP(&state, 0, state_read, NULL,
	346	state_eof, state_fseek);
	347	return ret == 0;
2446536b	348	}
	349
	350	/* cheats - TODO */
	351	void retro_cheat_reset(void)
	352	{
	353	}
	354
	355	void retro_cheat_set(unsigned index, bool enabled, const char *code)
	356	{
	357	}
	358
	359	/* multidisk support */
	360	static bool disk_ejected;
	361	static unsigned int disk_current_index;
	362	static unsigned int disk_count;
	363	static struct disks_state {
	364	char *fname;
	365	} disks[8];
	366
	367	static bool disk_set_eject_state(bool ejected)
	368	{
	369	// TODO?
	370	disk_ejected = ejected;
	371	return true;
	372	}
	373
	374	static bool disk_get_eject_state(void)
	375	{
	376	return disk_ejected;
	377	}
	378
	379	static unsigned int disk_get_image_index(void)
	380	{
	381	return disk_current_index;
	382	}
	383
	384	static bool disk_set_image_index(unsigned int index)
	385	{
	386	cd_img_type cd_type;
	387	int ret;
	388
	389	if (index >= sizeof(disks) / sizeof(disks[0]))
	390	return false;
	391
	392	if (disks[index].fname == NULL) {
	393	lprintf("missing disk #%u\n", index);
	394
	395	// RetroArch specifies "no disk" with index == count,
	396	// so don't fail here..
	397	disk_current_index = index;
	398	return true;
	399	}
	400
	401	lprintf("switching to disk %u: \"%s\"\n", index,
	402	disks[index].fname);
	403
	404	ret = -1;
	405	cd_type = PicoCdCheck(disks[index].fname, NULL);
	406	if (cd_type != CIT_NOT_CD)
	407	ret = Insert_CD(disks[index].fname, cd_type);
	408	if (ret != 0) {
	409	lprintf("Load failed, invalid CD image?\n");
	410	return 0;
	411	}
412
413	disk_current_index = index;
414	return true;
415	}
416
417	static unsigned int disk_get_num_images(void)
418	{
419	return disk_count;
420	}
421
422	static bool disk_replace_image_index(unsigned index,
423	const struct retro_game_info *info)
424	{
425	bool ret = true;
426
427	if (index >= sizeof(disks) / sizeof(disks[0]))
428	return false;
429
430	if (disks[index].fname != NULL)
431	free(disks[index].fname);
432	disks[index].fname = NULL;
433
434	if (info != NULL) {
435	disks[index].fname = strdup(info->path);
436	if (index == disk_current_index)
437	ret = disk_set_image_index(index);
438	}
439
440	return ret;
441	}
442
443	static bool disk_add_image_index(void)
444	{
445	if (disk_count >= sizeof(disks) / sizeof(disks[0]))
446	return false;
447
448	disk_count++;
449	return true;
450	}
451
452	static struct retro_disk_control_callback disk_control = {
453	.set_eject_state = disk_set_eject_state,
454	.get_eject_state = disk_get_eject_state,
455	.get_image_index = disk_get_image_index,
456	.set_image_index = disk_set_image_index,
457	.get_num_images = disk_get_num_images,
458	.replace_image_index = disk_replace_image_index,
459	.add_image_index = disk_add_image_index,
460	};
461
462	static void disk_tray_open(void)
463	{
464	lprintf("cd tray open\n");
465	disk_ejected = 1;
466	}
467
468	static void disk_tray_close(void)
469	{
470	lprintf("cd tray close\n");
471	disk_ejected = 0;
472	}
473
474
475	static const char * const biosfiles_us[] = {
476	"us_scd1_9210", "us_scd2_9306", "SegaCDBIOS9303", "bios_CD_U"
477	};
478	static const char * const biosfiles_eu[] = {
479	"eu_mcd1_9210", "eu_mcd2_9306", "eu_mcd2_9303", "bios_CD_E"
480	};
481	static const char * const biosfiles_jp[] = {
482	"jp_mcd1_9112", "jp_mcd1_9111", "bios_CD_J"
483	};
484
485	static void make_system_path(char *buf, size_t buf_size,
486	const char name, const char ext)
487	{
488	const char *dir = NULL;
489
490	if (environ_cb(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &dir) && dir) {
491	snprintf(buf, buf_size, "%s%c%s%s", dir, SLASH, name, ext);
492	}
493	else {
494	snprintf(buf, buf_size, "%s%s", name, ext);
495	}
496	}
497
498	static const char find_bios(int region, const char *cd_fname)
499	{
500	const char * const *files;
501	static char path[256];
502	int i, count;
503	FILE *f = NULL;
504
505	if (*region == 4) { // US
506	files = biosfiles_us;
507	count = sizeof(biosfiles_us) / sizeof(char *);
508	} else if (*region == 8) { // EU
509	files = biosfiles_eu;
510	count = sizeof(biosfiles_eu) / sizeof(char *);
511	} else if (region == 1 \|\| region == 2) {
512	files = biosfiles_jp;
513	count = sizeof(biosfiles_jp) / sizeof(char *);
514	} else {
515	return NULL;
516	}
517
518	for (i = 0; i < count; i++)
519	{
520	make_system_path(path, sizeof(path), files[i], ".bin");
521	f = fopen(path, "rb");
522	if (f != NULL)
523	break;
524
525	make_system_path(path, sizeof(path), files[i], ".zip");
526	f = fopen(path, "rb");
527	if (f != NULL)
528	break;
529	}
530
531	if (f != NULL) {
532	lprintf("using bios: %s\n", path);
533	fclose(f);
534	return path;
535	}
536
537	return NULL;
538	}
539
540	bool retro_load_game(const struct retro_game_info *info)
541	{
542	enum media_type_e media_type;
543	static char carthw_path[256];
544	size_t i;
545
546	enum retro_pixel_format fmt = RETRO_PIXEL_FORMAT_RGB565;
547	if (!environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt)) {
548	lprintf("RGB565 suppot required, sorry\n");
549	return false;
550	}
551
552	if (info == NULL \|\| info->path == NULL) {
553	lprintf("info->path required\n");
554	return false;
555	}
556
557	for (i = 0; i < sizeof(disks) / sizeof(disks[0]); i++) {
558	if (disks[i].fname != NULL) {
559	free(disks[i].fname);
560	disks[i].fname = NULL;
561	}
562	}
563
564	disk_current_index = 0;
565	disk_count = 1;
566	disks[0].fname = strdup(info->path);
567
568	make_system_path(carthw_path, sizeof(carthw_path), "carthw", ".cfg");
569
570	media_type = PicoLoadMedia(info->path, carthw_path,
571	find_bios, NULL);
572
573	switch (media_type) {
574	case PM_BAD_DETECT:
575	lprintf("Failed to detect ROM/CD image type.\n");
576	return false;
577	case PM_BAD_CD:
578	lprintf("Invalid CD image\n");
579	return false;
580	case PM_BAD_CD_NO_BIOS:
581	lprintf("Missing BIOS\n");
582	return false;
583	case PM_ERROR:
584	lprintf("Load error\n");
585	return false;
586	default:
587	break;
588	}
589
590	PicoLoopPrepare();
591
592	PicoWriteSound = snd_write;
593	memset(sndBuffer, 0, sizeof(sndBuffer));
594	PsndOut = sndBuffer;
595	PsndRerate(1);
596
597	return true;
598	}
599
600	bool retro_load_game_special(unsigned game_type, const struct retro_game_info *info, size_t num_info)
601	{
602	return false;
603	}
604
605	void retro_unload_game(void)
606	{
607	}
608
609	unsigned retro_get_region(void)
610	{
611	return Pico.m.pal ? RETRO_REGION_PAL : RETRO_REGION_NTSC;
612	}
613
614	void *retro_get_memory_data(unsigned id)
615	{
616	if (id != RETRO_MEMORY_SAVE_RAM)
617	return NULL;
618
619	if (PicoAHW & PAHW_MCD)
620	return Pico_mcd->bram;
621	else
622	return SRam.data;
623	}
624
625	size_t retro_get_memory_size(unsigned id)
626	{
627	if (id != RETRO_MEMORY_SAVE_RAM)
628	return 0;
629
630	if (PicoAHW & PAHW_MCD)
631	// bram
632	return 0x2000;
633	else
634	return SRam.size;
635	}
636
637	void retro_reset(void)
638	{
639	PicoReset();
640	}
641
642	static const unsigned short retro_pico_map[] = {
643	[RETRO_DEVICE_ID_JOYPAD_B] = 1 << GBTN_B,
644	[RETRO_DEVICE_ID_JOYPAD_Y] = 1 << GBTN_A,
645	[RETRO_DEVICE_ID_JOYPAD_SELECT] = 1 << GBTN_MODE,
646	[RETRO_DEVICE_ID_JOYPAD_START] = 1 << GBTN_START,
647	[RETRO_DEVICE_ID_JOYPAD_UP] = 1 << GBTN_UP,
648	[RETRO_DEVICE_ID_JOYPAD_DOWN] = 1 << GBTN_DOWN,
649	[RETRO_DEVICE_ID_JOYPAD_LEFT] = 1 << GBTN_LEFT,
650	[RETRO_DEVICE_ID_JOYPAD_RIGHT] = 1 << GBTN_RIGHT,
651	[RETRO_DEVICE_ID_JOYPAD_A] = 1 << GBTN_C,
652	[RETRO_DEVICE_ID_JOYPAD_X] = 1 << GBTN_Y,
653	[RETRO_DEVICE_ID_JOYPAD_L] = 1 << GBTN_X,
654	[RETRO_DEVICE_ID_JOYPAD_R] = 1 << GBTN_Z,
655	};
656	#define RETRO_PICO_MAP_LEN (sizeof(retro_pico_map) / sizeof(retro_pico_map[0]))
657
658	static void snd_write(int len)
659	{
660	audio_batch_cb(PsndOut, len / 4);
661	}
662
663	void retro_run(void)
664	{
665	bool updated = false;
666	int pad, i;
667
668	if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
669	; //update_variables(true);
670
671	input_poll_cb();
672
673	PicoPad[0] = PicoPad[1] = 0;
674	for (pad = 0; pad < 2; pad++)
675	for (i = 0; i < RETRO_PICO_MAP_LEN; i++)
676	if (input_state_cb(pad, RETRO_DEVICE_JOYPAD, 0, i))
677	PicoPad[pad] \|= retro_pico_map[i];
678
679	PicoFrame();
680
681	video_cb(vout_buf, vout_width, vout_height, vout_width * 2);
682	}
683
684	void retro_init(void)
685	{
686	int level;
687
688	#ifdef IOS
689	emu_log = fopen("/User/Documents/PicoDrive.log", "w");
690	if (emu_log == NULL)
691	emu_log = fopen("PicoDrive.log", "w");
692	if (emu_log == NULL)
693	#endif
694	emu_log = stdout;
695
696	level = 0;
697	environ_cb(RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL, &level);
698
699	environ_cb(RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE, &disk_control);
700
701	PicoOpt = POPT_EN_STEREO\|POPT_EN_FM\|POPT_EN_PSG\|POPT_EN_Z80
720bfc5d	702	\| POPT_EN_MCD_PCM\|POPT_EN_MCD_CDDA\|POPT_EN_MCD_GFX
	703	\| POPT_EN_32X\|POPT_EN_PWM
	704	\| POPT_ACC_SPRITES\|POPT_DIS_32C_BORDER;
	705	#ifdef __arm__
	706	PicoOpt \|= POPT_EN_SVP_DRC;
	707	#endif
2446536b	708	PsndRate = 44100;
	709	PicoAutoRgnOrder = 0x184; // US, EU, JP
	710	PicoCDBuffers = 0;
	711
2446536b	712	vout_width = 320;
	713	vout_height = 240;
	714	vout_buf = malloc(VOUT_MAX_WIDTH * VOUT_MAX_HEIGHT * 2);
	715
	716	PicoInit();
41946d70	717	PicoDrawSetOutFormat(PDF_RGB555, 0);
2446536b	718	PicoDrawSetOutBuf(vout_buf, vout_width * 2);
	719
	720	//PicoMessage = plat_status_msg_busy_next;
	721	PicoMCDopenTray = disk_tray_open;
	722	PicoMCDcloseTray = disk_tray_close;
	723	}
	724
	725	void retro_deinit(void)
	726	{
	727	PicoExit();
	728	}