[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>
#ifndef _WIN32
#include <sys/mman.h>
#else
#include <windows.h>
#endif
#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
}

#ifdef _WIN32
void* mmap(void *desired_addr,
	size_t len, 
	int mmap_prot, 
	int mmap_flags, 
	HANDLE fd,
	size_t off)
{
   return malloc(len);
}

void munmap(
	void *base_addr,
	size_t len
)
{
   free(base_addr);
}
#define MAP_FAILED 0
#define PROT_READ 0
#define PROT_WRITE 0
#define MAP_PRIVATE 0 
#define MAP_ANONYMOUS 0 
#endif
void *plat_mmap(unsigned long addr, size_t size, int need_exec, int is_fixed)
{
#ifndef _WIN32
   int flags = 0;
   void *ret = mmap((void*)addr,size,PROT_READ | PROT_WRITE, flags, -1, 0);
   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;
      }
   }
#else
   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;
      }
   }
#endif

	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)
{
#ifdef _WIN32
   int ret = VirtualProtect(ptr,size,PAGE_EXECUTE_READWRITE,0);
   if (ret == 0)
      lprintf("mprotect(%p, %zd) failed: %d\n", ptr, size, 0);
#else
   int ret = mprotect(ptr, size, PROT_READ | PROT_WRITE | PROT_EXEC);
   if (ret != 0)
      lprintf("mprotect(%p, %zd) failed: %d\n", ptr, size, errno);
#endif
	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>
e8b61936	13	#ifndef _WIN32
2446536b	14	#include <sys/mman.h>
e8b61936	15	#else
	16	#include <windows.h>
	17	#endif
c25d78ee	18	#include <errno.h>
2446536b	19	#ifdef __MACH__
	20	#include <libkern/OSCacheControl.h>
	21	#endif
	22
	23	#include <pico/pico_int.h>
86b38dc4	24	#include <pico/state.h>
2446536b	25	#include "common/input_pico.h"
	26	#include "common/version.h"
	27	#include "libretro.h"
	28
8c8b7284	29	#ifndef MAP_ANONYMOUS
	30	#define MAP_ANONYMOUS MAP_ANON
	31	#endif
	32
2446536b	33	static retro_video_refresh_t video_cb;
	34	static retro_input_poll_t input_poll_cb;
	35	static retro_input_state_t input_state_cb;
	36	static retro_environment_t environ_cb;
	37	static retro_audio_sample_batch_t audio_batch_cb;
	38
	39	static FILE *emu_log;
	40
	41	#define VOUT_MAX_WIDTH 320
	42	#define VOUT_MAX_HEIGHT 240
	43	static void *vout_buf;
	44	static int vout_width, vout_height;
	45
	46	static short __attribute__((aligned(4))) sndBuffer[2*44100/50];
	47
2446536b	48	static void snd_write(int len);
	49
	50	#ifdef _WIN32
	51	#define SLASH '\\'
	52	#else
	53	#define SLASH '/'
	54	#endif
	55
	56	/* functions called by the core */
	57
	58	void cache_flush_d_inval_i(void start, void end)
	59	{
	60	#ifdef __arm__
	61	#if defined(__BLACKBERRY_QNX__)
	62	msync(start, end - start, MS_SYNC \| MS_CACHE_ONLY \| MS_INVALIDATE_ICACHE);
	63	#elif defined(__MACH__)
	64	size_t len = (char )end - (char )start;
	65	sys_dcache_flush(start, len);
	66	sys_icache_invalidate(start, len);
	67	#else
	68	__clear_cache(start, end);
	69	#endif
	70	#endif
	71	}
	72
e8b61936	73	#ifdef _WIN32
	74	void* mmap(void *desired_addr,
	75	size_t len,
	76	int mmap_prot,
	77	int mmap_flags,
	78	HANDLE fd,
	79	size_t off)
2446536b	80	{
51e46624	81	return malloc(len);
e8b61936	82	}
2446536b	83
e8b61936	84	void munmap(
	85	void *base_addr,
	86	size_t len
	87	)
	88	{
51e46624	89	free(base_addr);
e8b61936	90	}
	91	#define MAP_FAILED 0
	92	#define PROT_READ 0
	93	#define PROT_WRITE 0
	94	#define MAP_PRIVATE 0
	95	#define MAP_ANONYMOUS 0
	96	#endif
	97	void *plat_mmap(unsigned long addr, size_t size, int need_exec, int is_fixed)
	98	{
	99	#ifndef _WIN32
	100	int flags = 0;
	101	void ret = mmap((void)addr,size,PROT_READ \| PROT_WRITE, flags, -1, 0);
	102	if (addr != 0 && ret != (void *)addr) {
	103	lprintf("warning: wanted to map @%08lx, got %p\n",
	104	addr, ret);
	105
	106	if (is_fixed) {
	107	munmap(ret, size);
	108	return NULL;
	109	}
	110	}
	111	#else
	112	int flags = MAP_PRIVATE \| MAP_ANONYMOUS;
	113	void req, ret;
	114
	115	req = (void *)addr;
	116	ret = mmap(req, size, PROT_READ \| PROT_WRITE, flags, -1, 0);
	117	if (ret == MAP_FAILED) {
	118	lprintf("mmap(%08lx, %zd) failed: %d\n", addr, size, errno);
	119	return NULL;
	120	}
	121
	122	if (addr != 0 && ret != (void *)addr) {
	123	lprintf("warning: wanted to map @%08lx, got %p\n",
	124	addr, ret);
	125
	126	if (is_fixed) {
	127	munmap(ret, size);
	128	return NULL;
	129	}
	130	}
	131	#endif
2446536b	132
	133	return ret;
	134	}
	135
	136	void plat_mremap(void ptr, size_t oldsize, size_t newsize)
	137	{
8c8b7284	138	#ifdef __linux__
2446536b	139	void *ret = mremap(ptr, oldsize, newsize, 0);
	140	if (ret == MAP_FAILED)
	141	return NULL;
	142
	143	return ret;
8c8b7284	144	#else
	145	void tmp, ret;
	146	size_t preserve_size;
	147
	148	preserve_size = oldsize;
	149	if (preserve_size > newsize)
	150	preserve_size = newsize;
	151	tmp = malloc(preserve_size);
	152	if (tmp == NULL)
	153	return NULL;
	154	memcpy(tmp, ptr, preserve_size);
	155
	156	munmap(ptr, oldsize);
	157	ret = mmap(ptr, newsize, PROT_READ \| PROT_WRITE,
	158	MAP_PRIVATE \| MAP_ANONYMOUS, -1, 0);
	159	if (ret == MAP_FAILED) {
	160	free(tmp);
	161	return NULL;
	162	}
	163	memcpy(ret, tmp, preserve_size);
	164	free(tmp);
	165	return ret;
	166	#endif
2446536b	167	}
	168
	169	void plat_munmap(void *ptr, size_t size)
	170	{
	171	if (ptr != NULL)
	172	munmap(ptr, size);
	173	}
	174
c25d78ee	175	int plat_mem_set_exec(void *ptr, size_t size)
c25d78ee	176	{
e8b61936	177	#ifdef _WIN32
	178	int ret = VirtualProtect(ptr,size,PAGE_EXECUTE_READWRITE,0);
	179	if (ret == 0)
	180	lprintf("mprotect(%p, %zd) failed: %d\n", ptr, size, 0);
	181	#else
	182	int ret = mprotect(ptr, size, PROT_READ \| PROT_WRITE \| PROT_EXEC);
	183	if (ret != 0)
	184	lprintf("mprotect(%p, %zd) failed: %d\n", ptr, size, errno);
	185	#endif
c25d78ee	186	return ret;
	187	}
	188
2446536b	189	void emu_video_mode_change(int start_line, int line_count, int is_32cols)
	190	{
	191	memset(vout_buf, 0, 320 * 240 * 2);
	192	vout_width = is_32cols ? 256 : 320;
	193	PicoDrawSetOutBuf(vout_buf, vout_width * 2);
	194	}
	195
	196	void emu_32x_startup(void)
	197	{
2446536b	198	}
	199
	200	#ifndef ANDROID
	201
	202	void lprintf(const char *fmt, ...)
	203	{
	204	va_list list;
	205
	206	va_start(list, fmt);
	207	fprintf(emu_log, "PicoDrive: ");
	208	vfprintf(emu_log, fmt, list);
	209	va_end(list);
	210	fflush(emu_log);
	211	}
	212
	213	#else
	214
	215	#include <android/log.h>
	216
	217	void lprintf(const char *fmt, ...)
	218	{
	219	va_list list;
	220
	221	va_start(list, fmt);
	222	__android_log_vprint(ANDROID_LOG_INFO, "PicoDrive", fmt, list);
	223	va_end(list);
	224	}
	225
	226	#endif
	227
	228	/* libretro */
	229	void retro_set_environment(retro_environment_t cb)
	230	{
	231	static const struct retro_variable vars[] = {
	232	//{ "region", "Region; Auto\|NTSC\|PAL" },
	233	{ NULL, NULL },
	234	};
	235
	236	environ_cb = cb;
	237
	238	cb(RETRO_ENVIRONMENT_SET_VARIABLES, (void *)vars);
	239	}
	240
	241	void retro_set_video_refresh(retro_video_refresh_t cb) { video_cb = cb; }
	242	void retro_set_audio_sample(retro_audio_sample_t cb) { (void)cb; }
	243	void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb) { audio_batch_cb = cb; }
	244	void retro_set_input_poll(retro_input_poll_t cb) { input_poll_cb = cb; }
	245	void retro_set_input_state(retro_input_state_t cb) { input_state_cb = cb; }
	246
	247	unsigned retro_api_version(void)
	248	{
	249	return RETRO_API_VERSION;
	250	}
	251
	252	void retro_set_controller_port_device(unsigned port, unsigned device)
	253	{
	254	}
	255
	256	void retro_get_system_info(struct retro_system_info *info)
	257	{
	258	memset(info, 0, sizeof(*info));
	259	info->library_name = "PicoDrive";
	260	info->library_version = VERSION;
53b2e51c	261	info->valid_extensions = "bin\|gen\|smd\|md\|32x\|cue\|iso\|sms";
2446536b	262	info->need_fullpath = true;
	263	}
	264
	265	void retro_get_system_av_info(struct retro_system_av_info *info)
	266	{
	267	memset(info, 0, sizeof(*info));
	268	info->timing.fps = Pico.m.pal ? 50 : 60;
	269	info->timing.sample_rate = 44100;
	270	info->geometry.base_width = 320;
	271	info->geometry.base_height = 240;
	272	info->geometry.max_width = VOUT_MAX_WIDTH;
	273	info->geometry.max_height = VOUT_MAX_HEIGHT;
	274	info->geometry.aspect_ratio = 4.0 / 3.0;
	275	}
	276
86b38dc4	277	/* savestates */
	278	struct savestate_state {
	279	const char *load_buf;
	280	char *save_buf;
	281	size_t size;
	282	size_t pos;
	283	};
	284
	285	size_t state_read(void p, size_t size, size_t nmemb, void file)
	286	{
	287	struct savestate_state *state = file;
	288	size_t bsize = size * nmemb;
	289
	290	if (state->pos + bsize > state->size) {
	291	lprintf("savestate error: %u/%u\n",
	292	state->pos + bsize, state->size);
	293	bsize = state->size - state->pos;
	294	if ((int)bsize <= 0)
	295	return 0;
	296	}
	297
	298	memcpy(p, state->load_buf + state->pos, bsize);
	299	state->pos += bsize;
	300	return bsize;
	301	}
	302
	303	size_t state_write(void p, size_t size, size_t nmemb, void file)
	304	{
	305	struct savestate_state *state = file;
	306	size_t bsize = size * nmemb;
	307
	308	if (state->pos + bsize > state->size) {
	309	lprintf("savestate error: %u/%u\n",
	310	state->pos + bsize, state->size);
	311	bsize = state->size - state->pos;
	312	if ((int)bsize <= 0)
	313	return 0;
	314	}
	315
	316	memcpy(state->save_buf + state->pos, p, bsize);
	317	state->pos += bsize;
	318	return bsize;
	319	}
	320
	321	size_t state_skip(void p, size_t size, size_t nmemb, void file)
	322	{
	323	struct savestate_state *state = file;
	324	size_t bsize = size * nmemb;
	325
	326	state->pos += bsize;
	327	return bsize;
	328	}
	329
	330	size_t state_eof(void *file)
	331	{
	332	struct savestate_state *state = file;
	333
	334	return state->pos >= state->size;
	335	}
	336
	337	int state_fseek(void *file, long offset, int whence)
	338	{
	339	struct savestate_state *state = file;
	340
341	switch (whence) {
342	case SEEK_SET:
343	state->pos = offset;
344	break;
345	case SEEK_CUR:
346	state->pos += offset;
347	break;
348	case SEEK_END:
349	state->pos = state->size + offset;
350	break;
351	}
352	return (int)state->pos;
353	}
354
355	/* savestate sizes vary wildly depending if cd/32x or
356	* carthw is active, so run the whole thing to get size */
2446536b	357	size_t retro_serialize_size(void)
2446536b	358	{
86b38dc4	359	struct savestate_state state = { 0, };
	360	int ret;
	361
	362	ret = PicoStateFP(&state, 1, NULL, state_skip, NULL, state_fseek);
	363	if (ret != 0)
	364	return 0;
	365
	366	return state.pos;
2446536b	367	}
	368
	369	bool retro_serialize(void *data, size_t size)
	370	{
86b38dc4	371	struct savestate_state state = { 0, };
	372	int ret;
	373
	374	state.save_buf = data;
	375	state.size = size;
	376	state.pos = 0;
	377
	378	ret = PicoStateFP(&state, 1, NULL, state_write,
	379	NULL, state_fseek);
	380	return ret == 0;
2446536b	381	}
	382
	383	bool retro_unserialize(const void *data, size_t size)
	384	{
86b38dc4	385	struct savestate_state state = { 0, };
	386	int ret;
	387
	388	state.load_buf = data;
	389	state.size = size;
	390	state.pos = 0;
	391
	392	ret = PicoStateFP(&state, 0, state_read, NULL,
	393	state_eof, state_fseek);
	394	return ret == 0;
2446536b	395	}
	396
	397	/* cheats - TODO */
	398	void retro_cheat_reset(void)
	399	{
	400	}
	401
	402	void retro_cheat_set(unsigned index, bool enabled, const char *code)
	403	{
	404	}
	405
	406	/* multidisk support */
	407	static bool disk_ejected;
	408	static unsigned int disk_current_index;
	409	static unsigned int disk_count;
	410	static struct disks_state {
	411	char *fname;
	412	} disks[8];
	413
	414	static bool disk_set_eject_state(bool ejected)
	415	{
	416	// TODO?
	417	disk_ejected = ejected;
	418	return true;
	419	}
	420
	421	static bool disk_get_eject_state(void)
	422	{
	423	return disk_ejected;
	424	}
	425
	426	static unsigned int disk_get_image_index(void)
	427	{
	428	return disk_current_index;
	429	}
	430
	431	static bool disk_set_image_index(unsigned int index)
	432	{
	433	cd_img_type cd_type;
	434	int ret;
	435
	436	if (index >= sizeof(disks) / sizeof(disks[0]))
	437	return false;
	438
	439	if (disks[index].fname == NULL) {
	440	lprintf("missing disk #%u\n", index);
	441
	442	// RetroArch specifies "no disk" with index == count,
	443	// so don't fail here..
	444	disk_current_index = index;
	445	return true;
	446	}
	447
	448	lprintf("switching to disk %u: \"%s\"\n", index,
	449	disks[index].fname);
	450
	451	ret = -1;
	452	cd_type = PicoCdCheck(disks[index].fname, NULL);
	453	if (cd_type != CIT_NOT_CD)
	454	ret = Insert_CD(disks[index].fname, cd_type);
	455	if (ret != 0) {
	456	lprintf("Load failed, invalid CD image?\n");
	457	return 0;
	458	}
459
460	disk_current_index = index;
461	return true;
462	}
463
464	static unsigned int disk_get_num_images(void)
465	{
466	return disk_count;
467	}
468
469	static bool disk_replace_image_index(unsigned index,
470	const struct retro_game_info *info)
471	{
472	bool ret = true;
473
474	if (index >= sizeof(disks) / sizeof(disks[0]))
475	return false;
476
477	if (disks[index].fname != NULL)
478	free(disks[index].fname);
479	disks[index].fname = NULL;
480
481	if (info != NULL) {
482	disks[index].fname = strdup(info->path);
483	if (index == disk_current_index)
484	ret = disk_set_image_index(index);
485	}
486
487	return ret;
488	}
489
490	static bool disk_add_image_index(void)
491	{
492	if (disk_count >= sizeof(disks) / sizeof(disks[0]))
493	return false;
494
495	disk_count++;
496	return true;
497	}
498
499	static struct retro_disk_control_callback disk_control = {
500	.set_eject_state = disk_set_eject_state,
501	.get_eject_state = disk_get_eject_state,
502	.get_image_index = disk_get_image_index,
503	.set_image_index = disk_set_image_index,
504	.get_num_images = disk_get_num_images,
505	.replace_image_index = disk_replace_image_index,
506	.add_image_index = disk_add_image_index,
507	};
508
509	static void disk_tray_open(void)
510	{
511	lprintf("cd tray open\n");
512	disk_ejected = 1;
513	}
514
515	static void disk_tray_close(void)
516	{
517	lprintf("cd tray close\n");
518	disk_ejected = 0;
519	}
520
521
522	static const char * const biosfiles_us[] = {
523	"us_scd1_9210", "us_scd2_9306", "SegaCDBIOS9303", "bios_CD_U"
524	};
525	static const char * const biosfiles_eu[] = {
526	"eu_mcd1_9210", "eu_mcd2_9306", "eu_mcd2_9303", "bios_CD_E"
527	};
528	static const char * const biosfiles_jp[] = {
529	"jp_mcd1_9112", "jp_mcd1_9111", "bios_CD_J"
530	};
531
532	static void make_system_path(char *buf, size_t buf_size,
533	const char name, const char ext)
534	{
535	const char *dir = NULL;
536
537	if (environ_cb(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &dir) && dir) {
538	snprintf(buf, buf_size, "%s%c%s%s", dir, SLASH, name, ext);
539	}
540	else {
541	snprintf(buf, buf_size, "%s%s", name, ext);
542	}
543	}
544
545	static const char find_bios(int region, const char *cd_fname)
546	{
547	const char * const *files;
548	static char path[256];
549	int i, count;
550	FILE *f = NULL;
551
552	if (*region == 4) { // US
553	files = biosfiles_us;
554	count = sizeof(biosfiles_us) / sizeof(char *);
555	} else if (*region == 8) { // EU
556	files = biosfiles_eu;
557	count = sizeof(biosfiles_eu) / sizeof(char *);
558	} else if (region == 1 \|\| region == 2) {
559	files = biosfiles_jp;
560	count = sizeof(biosfiles_jp) / sizeof(char *);
561	} else {
562	return NULL;
563	}
564
565	for (i = 0; i < count; i++)
566	{
567	make_system_path(path, sizeof(path), files[i], ".bin");
568	f = fopen(path, "rb");
569	if (f != NULL)
570	break;
571
572	make_system_path(path, sizeof(path), files[i], ".zip");
573	f = fopen(path, "rb");
574	if (f != NULL)
575	break;
576	}
577
578	if (f != NULL) {
579	lprintf("using bios: %s\n", path);
580	fclose(f);
581	return path;
582	}
583
584	return NULL;
585	}
586
587	bool retro_load_game(const struct retro_game_info *info)
588	{
589	enum media_type_e media_type;
590	static char carthw_path[256];
591	size_t i;
592
593	enum retro_pixel_format fmt = RETRO_PIXEL_FORMAT_RGB565;
594	if (!environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt)) {
595	lprintf("RGB565 suppot required, sorry\n");
596	return false;
597	}
598
599	if (info == NULL \|\| info->path == NULL) {
600	lprintf("info->path required\n");
601	return false;
602	}
603
604	for (i = 0; i < sizeof(disks) / sizeof(disks[0]); i++) {
605	if (disks[i].fname != NULL) {
606	free(disks[i].fname);
607	disks[i].fname = NULL;
608	}
609	}
610
611	disk_current_index = 0;
612	disk_count = 1;
613	disks[0].fname = strdup(info->path);
614
615	make_system_path(carthw_path, sizeof(carthw_path), "carthw", ".cfg");
616
617	media_type = PicoLoadMedia(info->path, carthw_path,
618	find_bios, NULL);
619
620	switch (media_type) {
621	case PM_BAD_DETECT:
622	lprintf("Failed to detect ROM/CD image type.\n");
623	return false;
624	case PM_BAD_CD:
625	lprintf("Invalid CD image\n");
626	return false;
627	case PM_BAD_CD_NO_BIOS:
628	lprintf("Missing BIOS\n");
629	return false;
630	case PM_ERROR:
631	lprintf("Load error\n");
632	return false;
633	default:
634	break;
635	}
636
637	PicoLoopPrepare();
638
639	PicoWriteSound = snd_write;
640	memset(sndBuffer, 0, sizeof(sndBuffer));
641	PsndOut = sndBuffer;
642	PsndRerate(1);
643
644	return true;
645	}
646
647	bool retro_load_game_special(unsigned game_type, const struct retro_game_info *info, size_t num_info)
648	{
649	return false;
650	}
651
652	void retro_unload_game(void)
653	{
654	}
655
656	unsigned retro_get_region(void)
657	{
658	return Pico.m.pal ? RETRO_REGION_PAL : RETRO_REGION_NTSC;
659	}
660
661	void *retro_get_memory_data(unsigned id)
662	{
663	if (id != RETRO_MEMORY_SAVE_RAM)
664	return NULL;
665
666	if (PicoAHW & PAHW_MCD)
667	return Pico_mcd->bram;
668	else
669	return SRam.data;
670	}
671
672	size_t retro_get_memory_size(unsigned id)
673	{
674	if (id != RETRO_MEMORY_SAVE_RAM)
675	return 0;
676
677	if (PicoAHW & PAHW_MCD)
678	// bram
679	return 0x2000;
680	else
681	return SRam.size;
682	}
683
684	void retro_reset(void)
685	{
686	PicoReset();
687	}
688
689	static const unsigned short retro_pico_map[] = {
690	[RETRO_DEVICE_ID_JOYPAD_B] = 1 << GBTN_B,
691	[RETRO_DEVICE_ID_JOYPAD_Y] = 1 << GBTN_A,
692	[RETRO_DEVICE_ID_JOYPAD_SELECT] = 1 << GBTN_MODE,
693	[RETRO_DEVICE_ID_JOYPAD_START] = 1 << GBTN_START,
694	[RETRO_DEVICE_ID_JOYPAD_UP] = 1 << GBTN_UP,
695	[RETRO_DEVICE_ID_JOYPAD_DOWN] = 1 << GBTN_DOWN,
696	[RETRO_DEVICE_ID_JOYPAD_LEFT] = 1 << GBTN_LEFT,
697	[RETRO_DEVICE_ID_JOYPAD_RIGHT] = 1 << GBTN_RIGHT,
698	[RETRO_DEVICE_ID_JOYPAD_A] = 1 << GBTN_C,
699	[RETRO_DEVICE_ID_JOYPAD_X] = 1 << GBTN_Y,
700	[RETRO_DEVICE_ID_JOYPAD_L] = 1 << GBTN_X,
701	[RETRO_DEVICE_ID_JOYPAD_R] = 1 << GBTN_Z,
702	};
703	#define RETRO_PICO_MAP_LEN (sizeof(retro_pico_map) / sizeof(retro_pico_map[0]))
704
705	static void snd_write(int len)
706	{
707	audio_batch_cb(PsndOut, len / 4);
708	}
709
710	void retro_run(void)
711	{
712	bool updated = false;
713	int pad, i;
714
715	if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
716	; //update_variables(true);
717
718	input_poll_cb();
719
720	PicoPad[0] = PicoPad[1] = 0;
721	for (pad = 0; pad < 2; pad++)
722	for (i = 0; i < RETRO_PICO_MAP_LEN; i++)
723	if (input_state_cb(pad, RETRO_DEVICE_JOYPAD, 0, i))
724	PicoPad[pad] \|= retro_pico_map[i];
725
726	PicoFrame();
727
728	video_cb(vout_buf, vout_width, vout_height, vout_width * 2);
729	}
730
731	void retro_init(void)
732	{
733	int level;
734
735	#ifdef IOS
736	emu_log = fopen("/User/Documents/PicoDrive.log", "w");
737	if (emu_log == NULL)
738	emu_log = fopen("PicoDrive.log", "w");
739	if (emu_log == NULL)
740	#endif
741	emu_log = stdout;
742
743	level = 0;
744	environ_cb(RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL, &level);
745
746	environ_cb(RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE, &disk_control);
747
748	PicoOpt = POPT_EN_STEREO\|POPT_EN_FM\|POPT_EN_PSG\|POPT_EN_Z80
720bfc5d	749	\| POPT_EN_MCD_PCM\|POPT_EN_MCD_CDDA\|POPT_EN_MCD_GFX
	750	\| POPT_EN_32X\|POPT_EN_PWM
	751	\| POPT_ACC_SPRITES\|POPT_DIS_32C_BORDER;
	752	#ifdef __arm__
	753	PicoOpt \|= POPT_EN_SVP_DRC;
	754	#endif
2446536b	755	PsndRate = 44100;
	756	PicoAutoRgnOrder = 0x184; // US, EU, JP
	757	PicoCDBuffers = 0;
	758
2446536b	759	vout_width = 320;
	760	vout_height = 240;
	761	vout_buf = malloc(VOUT_MAX_WIDTH * VOUT_MAX_HEIGHT * 2);
	762
	763	PicoInit();
41946d70	764	PicoDrawSetOutFormat(PDF_RGB555, 0);
2446536b	765	PicoDrawSetOutBuf(vout_buf, vout_width * 2);
	766
	767	//PicoMessage = plat_status_msg_busy_next;
	768	PicoMCDopenTray = disk_tray_open;
	769	PicoMCDcloseTray = disk_tray_close;
	770	}
	771
	772	void retro_deinit(void)
	773	{
	774	PicoExit();
	775	}