[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 "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];

// FIXME: these 2 shouldn't be here
static unsigned char PicoDraw2FB_[(8+320) * (8+240+8)];
unsigned char *PicoDraw2FB = PicoDraw2FB_;

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)
{
	PicoDrawSetOutFormat(PDF_RGB555, 1);
}

#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 - TODO */
size_t retro_serialize_size(void) 
{ 
       return 0;
}

bool retro_serialize(void *data, size_t size)
{ 
       return false;
}

bool retro_unserialize(const void *data, size_t size)
{
       return false;
}

/* 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, 1);
	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>
	20	#include "common/input_pico.h"
	21	#include "common/version.h"
	22	#include "libretro.h"
	23
8c8b7284	24	#ifndef MAP_ANONYMOUS
	25	#define MAP_ANONYMOUS MAP_ANON
	26	#endif
	27
2446536b	28	static retro_video_refresh_t video_cb;
	29	static retro_input_poll_t input_poll_cb;
	30	static retro_input_state_t input_state_cb;
	31	static retro_environment_t environ_cb;
	32	static retro_audio_sample_batch_t audio_batch_cb;
	33
	34	static FILE *emu_log;
	35
	36	#define VOUT_MAX_WIDTH 320
	37	#define VOUT_MAX_HEIGHT 240
	38	static void *vout_buf;
	39	static int vout_width, vout_height;
	40
	41	static short __attribute__((aligned(4))) sndBuffer[2*44100/50];
	42
	43	// FIXME: these 2 shouldn't be here
	44	static unsigned char PicoDraw2FB_[(8+320) * (8+240+8)];
	45	unsigned char *PicoDraw2FB = PicoDraw2FB_;
	46
	47	static void snd_write(int len);
	48
	49	#ifdef _WIN32
	50	#define SLASH '\\'
	51	#else
	52	#define SLASH '/'
	53	#endif
	54
	55	/* functions called by the core */
	56
	57	void cache_flush_d_inval_i(void start, void end)
	58	{
	59	#ifdef __arm__
	60	#if defined(__BLACKBERRY_QNX__)
	61	msync(start, end - start, MS_SYNC \| MS_CACHE_ONLY \| MS_INVALIDATE_ICACHE);
	62	#elif defined(__MACH__)
	63	size_t len = (char )end - (char )start;
	64	sys_dcache_flush(start, len);
	65	sys_icache_invalidate(start, len);
	66	#else
	67	__clear_cache(start, end);
	68	#endif
	69	#endif
	70	}
	71
	72	void *plat_mmap(unsigned long addr, size_t size, int need_exec, int is_fixed)
	73	{
	74	int flags = MAP_PRIVATE \| MAP_ANONYMOUS;
	75	void req, ret;
	76
	77	req = (void *)addr;
	78	ret = mmap(req, size, PROT_READ \| PROT_WRITE, flags, -1, 0);
c25d78ee	79	if (ret == MAP_FAILED) {
c25d78ee	80	lprintf("mmap(%08lx, %zd) failed: %d\n", addr, size, errno);
2446536b	81	return NULL;
c25d78ee	82	}
2446536b	83
	84	if (addr != 0 && ret != (void *)addr) {
	85	lprintf("warning: wanted to map @%08lx, got %p\n",
	86	addr, ret);
	87
	88	if (is_fixed) {
	89	munmap(ret, size);
	90	return NULL;
	91	}
	92	}
	93
	94	return ret;
	95	}
	96
	97	void plat_mremap(void ptr, size_t oldsize, size_t newsize)
	98	{
8c8b7284	99	#ifdef __linux__
2446536b	100	void *ret = mremap(ptr, oldsize, newsize, 0);
	101	if (ret == MAP_FAILED)
	102	return NULL;
	103
	104	return ret;
8c8b7284	105	#else
	106	void tmp, ret;
	107	size_t preserve_size;
	108
	109	preserve_size = oldsize;
	110	if (preserve_size > newsize)
	111	preserve_size = newsize;
	112	tmp = malloc(preserve_size);
	113	if (tmp == NULL)
	114	return NULL;
	115	memcpy(tmp, ptr, preserve_size);
	116
	117	munmap(ptr, oldsize);
	118	ret = mmap(ptr, newsize, PROT_READ \| PROT_WRITE,
	119	MAP_PRIVATE \| MAP_ANONYMOUS, -1, 0);
	120	if (ret == MAP_FAILED) {
	121	free(tmp);
	122	return NULL;
	123	}
	124	memcpy(ret, tmp, preserve_size);
	125	free(tmp);
	126	return ret;
	127	#endif
2446536b	128	}
	129
	130	void plat_munmap(void *ptr, size_t size)
	131	{
	132	if (ptr != NULL)
	133	munmap(ptr, size);
	134	}
	135
c25d78ee	136	int plat_mem_set_exec(void *ptr, size_t size)
	137	{
	138	int ret = mprotect(ptr, size, PROT_READ \| PROT_WRITE \| PROT_EXEC);
	139	if (ret != 0)
	140	lprintf("mprotect(%p, %zd) failed: %d\n", ptr, size, errno);
	141
	142	return ret;
	143	}
	144
2446536b	145	void emu_video_mode_change(int start_line, int line_count, int is_32cols)
	146	{
	147	memset(vout_buf, 0, 320 * 240 * 2);
	148	vout_width = is_32cols ? 256 : 320;
	149	PicoDrawSetOutBuf(vout_buf, vout_width * 2);
	150	}
	151
	152	void emu_32x_startup(void)
	153	{
	154	PicoDrawSetOutFormat(PDF_RGB555, 1);
	155	}
	156
	157	#ifndef ANDROID
	158
	159	void lprintf(const char *fmt, ...)
	160	{
	161	va_list list;
	162
	163	va_start(list, fmt);
	164	fprintf(emu_log, "PicoDrive: ");
	165	vfprintf(emu_log, fmt, list);
	166	va_end(list);
	167	fflush(emu_log);
	168	}
	169
	170	#else
	171
	172	#include <android/log.h>
	173
	174	void lprintf(const char *fmt, ...)
	175	{
	176	va_list list;
	177
	178	va_start(list, fmt);
	179	__android_log_vprint(ANDROID_LOG_INFO, "PicoDrive", fmt, list);
	180	va_end(list);
	181	}
	182
	183	#endif
	184
	185	/* libretro */
	186	void retro_set_environment(retro_environment_t cb)
	187	{
	188	static const struct retro_variable vars[] = {
	189	//{ "region", "Region; Auto\|NTSC\|PAL" },
	190	{ NULL, NULL },
	191	};
	192
	193	environ_cb = cb;
	194
	195	cb(RETRO_ENVIRONMENT_SET_VARIABLES, (void *)vars);
	196	}
	197
	198	void retro_set_video_refresh(retro_video_refresh_t cb) { video_cb = cb; }
	199	void retro_set_audio_sample(retro_audio_sample_t cb) { (void)cb; }
	200	void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb) { audio_batch_cb = cb; }
	201	void retro_set_input_poll(retro_input_poll_t cb) { input_poll_cb = cb; }
	202	void retro_set_input_state(retro_input_state_t cb) { input_state_cb = cb; }
	203
	204	unsigned retro_api_version(void)
	205	{
	206	return RETRO_API_VERSION;
	207	}
	208
209	void retro_set_controller_port_device(unsigned port, unsigned device)
210	{
211	}
212
213	void retro_get_system_info(struct retro_system_info *info)
214	{
215	memset(info, 0, sizeof(*info));
216	info->library_name = "PicoDrive";
217	info->library_version = VERSION;
53b2e51c	218	info->valid_extensions = "bin\|gen\|smd\|md\|32x\|cue\|iso\|sms";
2446536b	219	info->need_fullpath = true;
	220	}
	221
	222	void retro_get_system_av_info(struct retro_system_av_info *info)
	223	{
	224	memset(info, 0, sizeof(*info));
	225	info->timing.fps = Pico.m.pal ? 50 : 60;
	226	info->timing.sample_rate = 44100;
	227	info->geometry.base_width = 320;
	228	info->geometry.base_height = 240;
	229	info->geometry.max_width = VOUT_MAX_WIDTH;
	230	info->geometry.max_height = VOUT_MAX_HEIGHT;
	231	info->geometry.aspect_ratio = 4.0 / 3.0;
	232	}
	233
	234	/* savestates - TODO */
	235	size_t retro_serialize_size(void)
	236	{
	237	return 0;
	238	}
	239
	240	bool retro_serialize(void *data, size_t size)
	241	{
	242	return false;
	243	}
	244
	245	bool retro_unserialize(const void *data, size_t size)
	246	{
	247	return false;
	248	}
	249
	250	/* cheats - TODO */
	251	void retro_cheat_reset(void)
	252	{
	253	}
	254
	255	void retro_cheat_set(unsigned index, bool enabled, const char *code)
	256	{
	257	}
	258
	259	/* multidisk support */
	260	static bool disk_ejected;
	261	static unsigned int disk_current_index;
	262	static unsigned int disk_count;
	263	static struct disks_state {
	264	char *fname;
	265	} disks[8];
	266
	267	static bool disk_set_eject_state(bool ejected)
	268	{
	269	// TODO?
	270	disk_ejected = ejected;
	271	return true;
	272	}
	273
	274	static bool disk_get_eject_state(void)
	275	{
	276	return disk_ejected;
	277	}
	278
	279	static unsigned int disk_get_image_index(void)
	280	{
	281	return disk_current_index;
	282	}
283
284	static bool disk_set_image_index(unsigned int index)
285	{
286	cd_img_type cd_type;
287	int ret;
288
289	if (index >= sizeof(disks) / sizeof(disks[0]))
290	return false;
291
292	if (disks[index].fname == NULL) {
293	lprintf("missing disk #%u\n", index);
294
295	// RetroArch specifies "no disk" with index == count,
296	// so don't fail here..
297	disk_current_index = index;
298	return true;
299	}
300
301	lprintf("switching to disk %u: \"%s\"\n", index,
302	disks[index].fname);
303
304	ret = -1;
305	cd_type = PicoCdCheck(disks[index].fname, NULL);
306	if (cd_type != CIT_NOT_CD)
307	ret = Insert_CD(disks[index].fname, cd_type);
308	if (ret != 0) {
309	lprintf("Load failed, invalid CD image?\n");
310	return 0;
311	}
312
313	disk_current_index = index;
314	return true;
315	}
316
317	static unsigned int disk_get_num_images(void)
318	{
319	return disk_count;
320	}
321
322	static bool disk_replace_image_index(unsigned index,
323	const struct retro_game_info *info)
324	{
325	bool ret = true;
326
327	if (index >= sizeof(disks) / sizeof(disks[0]))
328	return false;
329
330	if (disks[index].fname != NULL)
331	free(disks[index].fname);
332	disks[index].fname = NULL;
333
334	if (info != NULL) {
335	disks[index].fname = strdup(info->path);
336	if (index == disk_current_index)
337	ret = disk_set_image_index(index);
338	}
339
340	return ret;
341	}
342
343	static bool disk_add_image_index(void)
344	{
345	if (disk_count >= sizeof(disks) / sizeof(disks[0]))
346	return false;
347
348	disk_count++;
349	return true;
350	}
351
352	static struct retro_disk_control_callback disk_control = {
353	.set_eject_state = disk_set_eject_state,
354	.get_eject_state = disk_get_eject_state,
355	.get_image_index = disk_get_image_index,
356	.set_image_index = disk_set_image_index,
357	.get_num_images = disk_get_num_images,
358	.replace_image_index = disk_replace_image_index,
359	.add_image_index = disk_add_image_index,
360	};
361
362	static void disk_tray_open(void)
363	{
364	lprintf("cd tray open\n");
365	disk_ejected = 1;
366	}
367
368	static void disk_tray_close(void)
369	{
370	lprintf("cd tray close\n");
371	disk_ejected = 0;
372	}
373
374
375	static const char * const biosfiles_us[] = {
376	"us_scd1_9210", "us_scd2_9306", "SegaCDBIOS9303", "bios_CD_U"
377	};
378	static const char * const biosfiles_eu[] = {
379	"eu_mcd1_9210", "eu_mcd2_9306", "eu_mcd2_9303", "bios_CD_E"
380	};
381	static const char * const biosfiles_jp[] = {
382	"jp_mcd1_9112", "jp_mcd1_9111", "bios_CD_J"
383	};
384
385	static void make_system_path(char *buf, size_t buf_size,
386	const char name, const char ext)
387	{
388	const char *dir = NULL;
389
390	if (environ_cb(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &dir) && dir) {
391	snprintf(buf, buf_size, "%s%c%s%s", dir, SLASH, name, ext);
392	}
393	else {
394	snprintf(buf, buf_size, "%s%s", name, ext);
395	}
396	}
397
398	static const char find_bios(int region, const char *cd_fname)
399	{
400	const char * const *files;
401	static char path[256];
402	int i, count;
403	FILE *f = NULL;
404
405	if (*region == 4) { // US
406	files = biosfiles_us;
407	count = sizeof(biosfiles_us) / sizeof(char *);
408	} else if (*region == 8) { // EU
409	files = biosfiles_eu;
410	count = sizeof(biosfiles_eu) / sizeof(char *);
411	} else if (region == 1 \|\| region == 2) {
412	files = biosfiles_jp;
413	count = sizeof(biosfiles_jp) / sizeof(char *);
414	} else {
415	return NULL;
416	}
417
418	for (i = 0; i < count; i++)
419	{
420	make_system_path(path, sizeof(path), files[i], ".bin");
421	f = fopen(path, "rb");
422	if (f != NULL)
423	break;
424
425	make_system_path(path, sizeof(path), files[i], ".zip");
426	f = fopen(path, "rb");
427	if (f != NULL)
428	break;
429	}
430
431	if (f != NULL) {
432	lprintf("using bios: %s\n", path);
433	fclose(f);
434	return path;
435	}
436
437	return NULL;
438	}
439
440	bool retro_load_game(const struct retro_game_info *info)
441	{
442	enum media_type_e media_type;
443	static char carthw_path[256];
444	size_t i;
445
446	enum retro_pixel_format fmt = RETRO_PIXEL_FORMAT_RGB565;
447	if (!environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt)) {
448	lprintf("RGB565 suppot required, sorry\n");
449	return false;
450	}
451
452	if (info == NULL \|\| info->path == NULL) {
453	lprintf("info->path required\n");
454	return false;
455	}
456
457	for (i = 0; i < sizeof(disks) / sizeof(disks[0]); i++) {
458	if (disks[i].fname != NULL) {
459	free(disks[i].fname);
460	disks[i].fname = NULL;
461	}
462	}
463
464	disk_current_index = 0;
465	disk_count = 1;
466	disks[0].fname = strdup(info->path);
467
468	make_system_path(carthw_path, sizeof(carthw_path), "carthw", ".cfg");
469
470	media_type = PicoLoadMedia(info->path, carthw_path,
471	find_bios, NULL);
472
473	switch (media_type) {
474	case PM_BAD_DETECT:
475	lprintf("Failed to detect ROM/CD image type.\n");
476	return false;
477	case PM_BAD_CD:
478	lprintf("Invalid CD image\n");
479	return false;
480	case PM_BAD_CD_NO_BIOS:
481	lprintf("Missing BIOS\n");
482	return false;
483	case PM_ERROR:
484	lprintf("Load error\n");
485	return false;
486	default:
487	break;
488	}
489
490	PicoLoopPrepare();
491
492	PicoWriteSound = snd_write;
493	memset(sndBuffer, 0, sizeof(sndBuffer));
494	PsndOut = sndBuffer;
495	PsndRerate(1);
496
497	return true;
498	}
499
500	bool retro_load_game_special(unsigned game_type, const struct retro_game_info *info, size_t num_info)
501	{
502	return false;
503	}
504
505	void retro_unload_game(void)
506	{
507	}
508
509	unsigned retro_get_region(void)
510	{
511	return Pico.m.pal ? RETRO_REGION_PAL : RETRO_REGION_NTSC;
512	}
513
514	void *retro_get_memory_data(unsigned id)
515	{
516	if (id != RETRO_MEMORY_SAVE_RAM)
517	return NULL;
518
519	if (PicoAHW & PAHW_MCD)
520	return Pico_mcd->bram;
521	else
522	return SRam.data;
523	}
524
525	size_t retro_get_memory_size(unsigned id)
526	{
527	if (id != RETRO_MEMORY_SAVE_RAM)
528	return 0;
529
530	if (PicoAHW & PAHW_MCD)
531	// bram
532	return 0x2000;
533	else
534	return SRam.size;
535	}
536
537	void retro_reset(void)
538	{
539	PicoReset();
540	}
541
542	static const unsigned short retro_pico_map[] = {
543	[RETRO_DEVICE_ID_JOYPAD_B] = 1 << GBTN_B,
544	[RETRO_DEVICE_ID_JOYPAD_Y] = 1 << GBTN_A,
545	[RETRO_DEVICE_ID_JOYPAD_SELECT] = 1 << GBTN_MODE,
546	[RETRO_DEVICE_ID_JOYPAD_START] = 1 << GBTN_START,
547	[RETRO_DEVICE_ID_JOYPAD_UP] = 1 << GBTN_UP,
548	[RETRO_DEVICE_ID_JOYPAD_DOWN] = 1 << GBTN_DOWN,
549	[RETRO_DEVICE_ID_JOYPAD_LEFT] = 1 << GBTN_LEFT,
550	[RETRO_DEVICE_ID_JOYPAD_RIGHT] = 1 << GBTN_RIGHT,
551	[RETRO_DEVICE_ID_JOYPAD_A] = 1 << GBTN_C,
552	[RETRO_DEVICE_ID_JOYPAD_X] = 1 << GBTN_Y,
553	[RETRO_DEVICE_ID_JOYPAD_L] = 1 << GBTN_X,
554	[RETRO_DEVICE_ID_JOYPAD_R] = 1 << GBTN_Z,
555	};
556	#define RETRO_PICO_MAP_LEN (sizeof(retro_pico_map) / sizeof(retro_pico_map[0]))
557
558	static void snd_write(int len)
559	{
560	audio_batch_cb(PsndOut, len / 4);
561	}
562
563	void retro_run(void)
564	{
565	bool updated = false;
566	int pad, i;
567
568	if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
569	; //update_variables(true);
570
571	input_poll_cb();
572
573	PicoPad[0] = PicoPad[1] = 0;
574	for (pad = 0; pad < 2; pad++)
575	for (i = 0; i < RETRO_PICO_MAP_LEN; i++)
576	if (input_state_cb(pad, RETRO_DEVICE_JOYPAD, 0, i))
577	PicoPad[pad] \|= retro_pico_map[i];
578
579	PicoFrame();
580
581	video_cb(vout_buf, vout_width, vout_height, vout_width * 2);
582	}
583
584	void retro_init(void)
585	{
586	int level;
587
588	#ifdef IOS
589	emu_log = fopen("/User/Documents/PicoDrive.log", "w");
590	if (emu_log == NULL)
591	emu_log = fopen("PicoDrive.log", "w");
592	if (emu_log == NULL)
593	#endif
594	emu_log = stdout;
595
596	level = 0;
597	environ_cb(RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL, &level);
598
599	environ_cb(RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE, &disk_control);
600
601	PicoOpt = POPT_EN_STEREO\|POPT_EN_FM\|POPT_EN_PSG\|POPT_EN_Z80
720bfc5d	602	\| POPT_EN_MCD_PCM\|POPT_EN_MCD_CDDA\|POPT_EN_MCD_GFX
	603	\| POPT_EN_32X\|POPT_EN_PWM
	604	\| POPT_ACC_SPRITES\|POPT_DIS_32C_BORDER;
	605	#ifdef __arm__
	606	PicoOpt \|= POPT_EN_SVP_DRC;
	607	#endif
2446536b	608	PsndRate = 44100;
	609	PicoAutoRgnOrder = 0x184; // US, EU, JP
	610	PicoCDBuffers = 0;
	611
2446536b	612	vout_width = 320;
	613	vout_height = 240;
	614	vout_buf = malloc(VOUT_MAX_WIDTH * VOUT_MAX_HEIGHT * 2);
	615
	616	PicoInit();
	617	PicoDrawSetOutFormat(PDF_RGB555, 1);
	618	PicoDrawSetOutBuf(vout_buf, vout_width * 2);
	619
	620	//PicoMessage = plat_status_msg_busy_next;
	621	PicoMCDopenTray = disk_tray_open;
	622	PicoMCDcloseTray = disk_tray_close;
	623	}
	624
	625	void retro_deinit(void)
	626	{
	627	PicoExit();
	628	}