[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"

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)
{
	void *ret = mremap(ptr, oldsize, newsize, 0);
	if (ret == MAP_FAILED)
		return NULL;

	return ret;
}

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;

	p32x_msh2_multiplier = MSH2_MULTI_DEFAULT;
	p32x_ssh2_multiplier = SSH2_MULTI_DEFAULT;

	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
	24	static retro_video_refresh_t video_cb;
	25	static retro_input_poll_t input_poll_cb;
	26	static retro_input_state_t input_state_cb;
	27	static retro_environment_t environ_cb;
	28	static retro_audio_sample_batch_t audio_batch_cb;
	29
	30	static FILE *emu_log;
	31
	32	#define VOUT_MAX_WIDTH 320
	33	#define VOUT_MAX_HEIGHT 240
	34	static void *vout_buf;
	35	static int vout_width, vout_height;
	36
	37	static short __attribute__((aligned(4))) sndBuffer[2*44100/50];
	38
	39	// FIXME: these 2 shouldn't be here
	40	static unsigned char PicoDraw2FB_[(8+320) * (8+240+8)];
	41	unsigned char *PicoDraw2FB = PicoDraw2FB_;
	42
	43	static void snd_write(int len);
	44
	45	#ifdef _WIN32
	46	#define SLASH '\\'
	47	#else
	48	#define SLASH '/'
	49	#endif
	50
	51	/* functions called by the core */
	52
	53	void cache_flush_d_inval_i(void start, void end)
	54	{
	55	#ifdef __arm__
	56	#if defined(__BLACKBERRY_QNX__)
	57	msync(start, end - start, MS_SYNC \| MS_CACHE_ONLY \| MS_INVALIDATE_ICACHE);
	58	#elif defined(__MACH__)
	59	size_t len = (char )end - (char )start;
	60	sys_dcache_flush(start, len);
	61	sys_icache_invalidate(start, len);
	62	#else
	63	__clear_cache(start, end);
	64	#endif
	65	#endif
	66	}
	67
	68	void *plat_mmap(unsigned long addr, size_t size, int need_exec, int is_fixed)
	69	{
	70	int flags = MAP_PRIVATE \| MAP_ANONYMOUS;
	71	void req, ret;
	72
	73	req = (void *)addr;
	74	ret = mmap(req, size, PROT_READ \| PROT_WRITE, flags, -1, 0);
c25d78ee	75	if (ret == MAP_FAILED) {
c25d78ee	76	lprintf("mmap(%08lx, %zd) failed: %d\n", addr, size, errno);
2446536b	77	return NULL;
c25d78ee	78	}
2446536b	79
	80	if (addr != 0 && ret != (void *)addr) {
	81	lprintf("warning: wanted to map @%08lx, got %p\n",
	82	addr, ret);
	83
	84	if (is_fixed) {
	85	munmap(ret, size);
	86	return NULL;
	87	}
	88	}
	89
	90	return ret;
	91	}
	92
	93	void plat_mremap(void ptr, size_t oldsize, size_t newsize)
	94	{
	95	void *ret = mremap(ptr, oldsize, newsize, 0);
	96	if (ret == MAP_FAILED)
	97	return NULL;
	98
	99	return ret;
	100	}
	101
	102	void plat_munmap(void *ptr, size_t size)
	103	{
	104	if (ptr != NULL)
	105	munmap(ptr, size);
	106	}
	107
c25d78ee	108	int plat_mem_set_exec(void *ptr, size_t size)
	109	{
	110	int ret = mprotect(ptr, size, PROT_READ \| PROT_WRITE \| PROT_EXEC);
	111	if (ret != 0)
	112	lprintf("mprotect(%p, %zd) failed: %d\n", ptr, size, errno);
	113
	114	return ret;
	115	}
	116
2446536b	117	void emu_video_mode_change(int start_line, int line_count, int is_32cols)
	118	{
	119	memset(vout_buf, 0, 320 * 240 * 2);
	120	vout_width = is_32cols ? 256 : 320;
	121	PicoDrawSetOutBuf(vout_buf, vout_width * 2);
	122	}
	123
	124	void emu_32x_startup(void)
	125	{
	126	PicoDrawSetOutFormat(PDF_RGB555, 1);
	127	}
	128
	129	#ifndef ANDROID
	130
	131	void lprintf(const char *fmt, ...)
	132	{
	133	va_list list;
	134
	135	va_start(list, fmt);
	136	fprintf(emu_log, "PicoDrive: ");
	137	vfprintf(emu_log, fmt, list);
	138	va_end(list);
	139	fflush(emu_log);
	140	}
	141
	142	#else
	143
	144	#include <android/log.h>
	145
	146	void lprintf(const char *fmt, ...)
	147	{
	148	va_list list;
	149
	150	va_start(list, fmt);
	151	__android_log_vprint(ANDROID_LOG_INFO, "PicoDrive", fmt, list);
	152	va_end(list);
	153	}
	154
	155	#endif
	156
	157	/* libretro */
	158	void retro_set_environment(retro_environment_t cb)
	159	{
	160	static const struct retro_variable vars[] = {
	161	//{ "region", "Region; Auto\|NTSC\|PAL" },
	162	{ NULL, NULL },
	163	};
	164
	165	environ_cb = cb;
	166
	167	cb(RETRO_ENVIRONMENT_SET_VARIABLES, (void *)vars);
	168	}
	169
	170	void retro_set_video_refresh(retro_video_refresh_t cb) { video_cb = cb; }
	171	void retro_set_audio_sample(retro_audio_sample_t cb) { (void)cb; }
	172	void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb) { audio_batch_cb = cb; }
	173	void retro_set_input_poll(retro_input_poll_t cb) { input_poll_cb = cb; }
	174	void retro_set_input_state(retro_input_state_t cb) { input_state_cb = cb; }
	175
	176	unsigned retro_api_version(void)
	177	{
	178	return RETRO_API_VERSION;
	179	}
	180
181	void retro_set_controller_port_device(unsigned port, unsigned device)
182	{
183	}
184
185	void retro_get_system_info(struct retro_system_info *info)
186	{
187	memset(info, 0, sizeof(*info));
188	info->library_name = "PicoDrive";
189	info->library_version = VERSION;
53b2e51c	190	info->valid_extensions = "bin\|gen\|smd\|md\|32x\|cue\|iso\|sms";
2446536b	191	info->need_fullpath = true;
	192	}
	193
	194	void retro_get_system_av_info(struct retro_system_av_info *info)
	195	{
	196	memset(info, 0, sizeof(*info));
	197	info->timing.fps = Pico.m.pal ? 50 : 60;
	198	info->timing.sample_rate = 44100;
	199	info->geometry.base_width = 320;
	200	info->geometry.base_height = 240;
	201	info->geometry.max_width = VOUT_MAX_WIDTH;
	202	info->geometry.max_height = VOUT_MAX_HEIGHT;
	203	info->geometry.aspect_ratio = 4.0 / 3.0;
	204	}
	205
	206	/* savestates - TODO */
	207	size_t retro_serialize_size(void)
	208	{
	209	return 0;
	210	}
	211
	212	bool retro_serialize(void *data, size_t size)
	213	{
	214	return false;
	215	}
	216
	217	bool retro_unserialize(const void *data, size_t size)
	218	{
	219	return false;
	220	}
	221
	222	/* cheats - TODO */
	223	void retro_cheat_reset(void)
	224	{
	225	}
	226
	227	void retro_cheat_set(unsigned index, bool enabled, const char *code)
	228	{
	229	}
	230
	231	/* multidisk support */
	232	static bool disk_ejected;
	233	static unsigned int disk_current_index;
	234	static unsigned int disk_count;
	235	static struct disks_state {
	236	char *fname;
	237	} disks[8];
	238
	239	static bool disk_set_eject_state(bool ejected)
	240	{
	241	// TODO?
	242	disk_ejected = ejected;
	243	return true;
	244	}
	245
	246	static bool disk_get_eject_state(void)
	247	{
	248	return disk_ejected;
	249	}
	250
	251	static unsigned int disk_get_image_index(void)
	252	{
	253	return disk_current_index;
	254	}
255
256	static bool disk_set_image_index(unsigned int index)
257	{
258	cd_img_type cd_type;
259	int ret;
260
261	if (index >= sizeof(disks) / sizeof(disks[0]))
262	return false;
263
264	if (disks[index].fname == NULL) {
265	lprintf("missing disk #%u\n", index);
266
267	// RetroArch specifies "no disk" with index == count,
268	// so don't fail here..
269	disk_current_index = index;
270	return true;
271	}
272
273	lprintf("switching to disk %u: \"%s\"\n", index,
274	disks[index].fname);
275
276	ret = -1;
277	cd_type = PicoCdCheck(disks[index].fname, NULL);
278	if (cd_type != CIT_NOT_CD)
279	ret = Insert_CD(disks[index].fname, cd_type);
280	if (ret != 0) {
281	lprintf("Load failed, invalid CD image?\n");
282	return 0;
283	}
284
285	disk_current_index = index;
286	return true;
287	}
288
289	static unsigned int disk_get_num_images(void)
290	{
291	return disk_count;
292	}
293
294	static bool disk_replace_image_index(unsigned index,
295	const struct retro_game_info *info)
296	{
297	bool ret = true;
298
299	if (index >= sizeof(disks) / sizeof(disks[0]))
300	return false;
301
302	if (disks[index].fname != NULL)
303	free(disks[index].fname);
304	disks[index].fname = NULL;
305
306	if (info != NULL) {
307	disks[index].fname = strdup(info->path);
308	if (index == disk_current_index)
309	ret = disk_set_image_index(index);
310	}
311
312	return ret;
313	}
314
315	static bool disk_add_image_index(void)
316	{
317	if (disk_count >= sizeof(disks) / sizeof(disks[0]))
318	return false;
319
320	disk_count++;
321	return true;
322	}
323
324	static struct retro_disk_control_callback disk_control = {
325	.set_eject_state = disk_set_eject_state,
326	.get_eject_state = disk_get_eject_state,
327	.get_image_index = disk_get_image_index,
328	.set_image_index = disk_set_image_index,
329	.get_num_images = disk_get_num_images,
330	.replace_image_index = disk_replace_image_index,
331	.add_image_index = disk_add_image_index,
332	};
333
334	static void disk_tray_open(void)
335	{
336	lprintf("cd tray open\n");
337	disk_ejected = 1;
338	}
339
340	static void disk_tray_close(void)
341	{
342	lprintf("cd tray close\n");
343	disk_ejected = 0;
344	}
345
346
347	static const char * const biosfiles_us[] = {
348	"us_scd1_9210", "us_scd2_9306", "SegaCDBIOS9303", "bios_CD_U"
349	};
350	static const char * const biosfiles_eu[] = {
351	"eu_mcd1_9210", "eu_mcd2_9306", "eu_mcd2_9303", "bios_CD_E"
352	};
353	static const char * const biosfiles_jp[] = {
354	"jp_mcd1_9112", "jp_mcd1_9111", "bios_CD_J"
355	};
356
357	static void make_system_path(char *buf, size_t buf_size,
358	const char name, const char ext)
359	{
360	const char *dir = NULL;
361
362	if (environ_cb(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &dir) && dir) {
363	snprintf(buf, buf_size, "%s%c%s%s", dir, SLASH, name, ext);
364	}
365	else {
366	snprintf(buf, buf_size, "%s%s", name, ext);
367	}
368	}
369
370	static const char find_bios(int region, const char *cd_fname)
371	{
372	const char * const *files;
373	static char path[256];
374	int i, count;
375	FILE *f = NULL;
376
377	if (*region == 4) { // US
378	files = biosfiles_us;
379	count = sizeof(biosfiles_us) / sizeof(char *);
380	} else if (*region == 8) { // EU
381	files = biosfiles_eu;
382	count = sizeof(biosfiles_eu) / sizeof(char *);
383	} else if (region == 1 \|\| region == 2) {
384	files = biosfiles_jp;
385	count = sizeof(biosfiles_jp) / sizeof(char *);
386	} else {
387	return NULL;
388	}
389
390	for (i = 0; i < count; i++)
391	{
392	make_system_path(path, sizeof(path), files[i], ".bin");
393	f = fopen(path, "rb");
394	if (f != NULL)
395	break;
396
397	make_system_path(path, sizeof(path), files[i], ".zip");
398	f = fopen(path, "rb");
399	if (f != NULL)
400	break;
401	}
402
403	if (f != NULL) {
404	lprintf("using bios: %s\n", path);
405	fclose(f);
406	return path;
407	}
408
409	return NULL;
410	}
411
412	bool retro_load_game(const struct retro_game_info *info)
413	{
414	enum media_type_e media_type;
415	static char carthw_path[256];
416	size_t i;
417
418	enum retro_pixel_format fmt = RETRO_PIXEL_FORMAT_RGB565;
419	if (!environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt)) {
420	lprintf("RGB565 suppot required, sorry\n");
421	return false;
422	}
423
424	if (info == NULL \|\| info->path == NULL) {
425	lprintf("info->path required\n");
426	return false;
427	}
428
429	for (i = 0; i < sizeof(disks) / sizeof(disks[0]); i++) {
430	if (disks[i].fname != NULL) {
431	free(disks[i].fname);
432	disks[i].fname = NULL;
433	}
434	}
435
436	disk_current_index = 0;
437	disk_count = 1;
438	disks[0].fname = strdup(info->path);
439
440	make_system_path(carthw_path, sizeof(carthw_path), "carthw", ".cfg");
441
442	media_type = PicoLoadMedia(info->path, carthw_path,
443	find_bios, NULL);
444
445	switch (media_type) {
446	case PM_BAD_DETECT:
447	lprintf("Failed to detect ROM/CD image type.\n");
448	return false;
449	case PM_BAD_CD:
450	lprintf("Invalid CD image\n");
451	return false;
452	case PM_BAD_CD_NO_BIOS:
453	lprintf("Missing BIOS\n");
454	return false;
455	case PM_ERROR:
456	lprintf("Load error\n");
457	return false;
458	default:
459	break;
460	}
461
462	PicoLoopPrepare();
463
464	PicoWriteSound = snd_write;
465	memset(sndBuffer, 0, sizeof(sndBuffer));
466	PsndOut = sndBuffer;
467	PsndRerate(1);
468
469	return true;
470	}
471
472	bool retro_load_game_special(unsigned game_type, const struct retro_game_info *info, size_t num_info)
473	{
474	return false;
475	}
476
477	void retro_unload_game(void)
478	{
479	}
480
481	unsigned retro_get_region(void)
482	{
483	return Pico.m.pal ? RETRO_REGION_PAL : RETRO_REGION_NTSC;
484	}
485
486	void *retro_get_memory_data(unsigned id)
487	{
488	if (id != RETRO_MEMORY_SAVE_RAM)
489	return NULL;
490
491	if (PicoAHW & PAHW_MCD)
492	return Pico_mcd->bram;
493	else
494	return SRam.data;
495	}
496
497	size_t retro_get_memory_size(unsigned id)
498	{
499	if (id != RETRO_MEMORY_SAVE_RAM)
500	return 0;
501
502	if (PicoAHW & PAHW_MCD)
503	// bram
504	return 0x2000;
505	else
506	return SRam.size;
507	}
508
509	void retro_reset(void)
510	{
511	PicoReset();
512	}
513
514	static const unsigned short retro_pico_map[] = {
515	[RETRO_DEVICE_ID_JOYPAD_B] = 1 << GBTN_B,
516	[RETRO_DEVICE_ID_JOYPAD_Y] = 1 << GBTN_A,
517	[RETRO_DEVICE_ID_JOYPAD_SELECT] = 1 << GBTN_MODE,
518	[RETRO_DEVICE_ID_JOYPAD_START] = 1 << GBTN_START,
519	[RETRO_DEVICE_ID_JOYPAD_UP] = 1 << GBTN_UP,
520	[RETRO_DEVICE_ID_JOYPAD_DOWN] = 1 << GBTN_DOWN,
521	[RETRO_DEVICE_ID_JOYPAD_LEFT] = 1 << GBTN_LEFT,
522	[RETRO_DEVICE_ID_JOYPAD_RIGHT] = 1 << GBTN_RIGHT,
523	[RETRO_DEVICE_ID_JOYPAD_A] = 1 << GBTN_C,
524	[RETRO_DEVICE_ID_JOYPAD_X] = 1 << GBTN_Y,
525	[RETRO_DEVICE_ID_JOYPAD_L] = 1 << GBTN_X,
526	[RETRO_DEVICE_ID_JOYPAD_R] = 1 << GBTN_Z,
527	};
528	#define RETRO_PICO_MAP_LEN (sizeof(retro_pico_map) / sizeof(retro_pico_map[0]))
529
530	static void snd_write(int len)
531	{
532	audio_batch_cb(PsndOut, len / 4);
533	}
534
535	void retro_run(void)
536	{
537	bool updated = false;
538	int pad, i;
539
540	if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
541	; //update_variables(true);
542
543	input_poll_cb();
544
545	PicoPad[0] = PicoPad[1] = 0;
546	for (pad = 0; pad < 2; pad++)
547	for (i = 0; i < RETRO_PICO_MAP_LEN; i++)
548	if (input_state_cb(pad, RETRO_DEVICE_JOYPAD, 0, i))
549	PicoPad[pad] \|= retro_pico_map[i];
550
551	PicoFrame();
552
553	video_cb(vout_buf, vout_width, vout_height, vout_width * 2);
554	}
555
556	void retro_init(void)
557	{
558	int level;
559
560	#ifdef IOS
561	emu_log = fopen("/User/Documents/PicoDrive.log", "w");
562	if (emu_log == NULL)
563	emu_log = fopen("PicoDrive.log", "w");
564	if (emu_log == NULL)
565	#endif
566	emu_log = stdout;
567
568	level = 0;
569	environ_cb(RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL, &level);
570
571	environ_cb(RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE, &disk_control);
572
573	PicoOpt = POPT_EN_STEREO\|POPT_EN_FM\|POPT_EN_PSG\|POPT_EN_Z80
720bfc5d	574	\| POPT_EN_MCD_PCM\|POPT_EN_MCD_CDDA\|POPT_EN_MCD_GFX
	575	\| POPT_EN_32X\|POPT_EN_PWM
	576	\| POPT_ACC_SPRITES\|POPT_DIS_32C_BORDER;
	577	#ifdef __arm__
	578	PicoOpt \|= POPT_EN_SVP_DRC;
	579	#endif
2446536b	580	PsndRate = 44100;
	581	PicoAutoRgnOrder = 0x184; // US, EU, JP
	582	PicoCDBuffers = 0;
	583
	584	p32x_msh2_multiplier = MSH2_MULTI_DEFAULT;
	585	p32x_ssh2_multiplier = SSH2_MULTI_DEFAULT;
	586
	587	vout_width = 320;
	588	vout_height = 240;
	589	vout_buf = malloc(VOUT_MAX_WIDTH * VOUT_MAX_HEIGHT * 2);
	590
	591	PicoInit();
	592	PicoDrawSetOutFormat(PDF_RGB555, 1);
	593	PicoDrawSetOutBuf(vout_buf, vout_width * 2);
	594
	595	//PicoMessage = plat_status_msg_busy_next;
	596	PicoMCDopenTray = disk_tray_open;
	597	PicoMCDcloseTray = disk_tray_close;
	598	}
	599
	600	void retro_deinit(void)
	601	{
	602	PicoExit();
	603	}