[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)
{
    HANDLE fmh;
	void *base_addr;
	SECURITY_ATTRIBUTES sa;
	sa.nLength = sizeof(sa);
	sa.lpSecurityDescriptor = NULL;
	sa.bInheritHandle = TRUE;
	fmh = CreateFileMapping(fd, &sa, PAGE_WRITECOPY , 0, len, NULL);
	if (fmh == NULL){ return NULL; }
    base_addr = MapViewOfFileEx(fmh, FILE_MAP_WRITE|FILE_MAP_READ, 0, off, len, desired_addr);
	CloseHandle(fmh);
	return base_addr;
}

void munmap(
	void *base_addr,
	size_t len
)
{
	UnmapViewOfFile(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	{
e8b61936	81	HANDLE fmh;
	82	void *base_addr;
	83	SECURITY_ATTRIBUTES sa;
	84	sa.nLength = sizeof(sa);
	85	sa.lpSecurityDescriptor = NULL;
	86	sa.bInheritHandle = TRUE;
	87	fmh = CreateFileMapping(fd, &sa, PAGE_WRITECOPY , 0, len, NULL);
	88	if (fmh == NULL){ return NULL; }
	89	base_addr = MapViewOfFileEx(fmh, FILE_MAP_WRITE\|FILE_MAP_READ, 0, off, len, desired_addr);
	90	CloseHandle(fmh);
	91	return base_addr;
	92	}
2446536b	93
e8b61936	94	void munmap(
	95	void *base_addr,
	96	size_t len
	97	)
	98	{
	99	UnmapViewOfFile(base_addr);
	100	}
	101	#define MAP_FAILED 0
	102	#define PROT_READ 0
	103	#define PROT_WRITE 0
	104	#define MAP_PRIVATE 0
	105	#define MAP_ANONYMOUS 0
	106	#endif
	107	void *plat_mmap(unsigned long addr, size_t size, int need_exec, int is_fixed)
	108	{
	109	#ifndef _WIN32
	110	int flags = 0;
	111	void ret = mmap((void)addr,size,PROT_READ \| PROT_WRITE, flags, -1, 0);
	112	if (addr != 0 && ret != (void *)addr) {
	113	lprintf("warning: wanted to map @%08lx, got %p\n",
	114	addr, ret);
	115
	116	if (is_fixed) {
	117	munmap(ret, size);
	118	return NULL;
	119	}
	120	}
	121	#else
	122	int flags = MAP_PRIVATE \| MAP_ANONYMOUS;
	123	void req, ret;
	124
	125	req = (void *)addr;
	126	ret = mmap(req, size, PROT_READ \| PROT_WRITE, flags, -1, 0);
	127	if (ret == MAP_FAILED) {
	128	lprintf("mmap(%08lx, %zd) failed: %d\n", addr, size, errno);
	129	return NULL;
	130	}
	131
	132	if (addr != 0 && ret != (void *)addr) {
	133	lprintf("warning: wanted to map @%08lx, got %p\n",
	134	addr, ret);
	135
	136	if (is_fixed) {
	137	munmap(ret, size);
	138	return NULL;
	139	}
	140	}
	141	#endif
2446536b	142
	143	return ret;
	144	}
	145
	146	void plat_mremap(void ptr, size_t oldsize, size_t newsize)
	147	{
8c8b7284	148	#ifdef __linux__
2446536b	149	void *ret = mremap(ptr, oldsize, newsize, 0);
	150	if (ret == MAP_FAILED)
	151	return NULL;
	152
	153	return ret;
8c8b7284	154	#else
	155	void tmp, ret;
	156	size_t preserve_size;
	157
	158	preserve_size = oldsize;
	159	if (preserve_size > newsize)
	160	preserve_size = newsize;
	161	tmp = malloc(preserve_size);
	162	if (tmp == NULL)
	163	return NULL;
	164	memcpy(tmp, ptr, preserve_size);
	165
	166	munmap(ptr, oldsize);
	167	ret = mmap(ptr, newsize, PROT_READ \| PROT_WRITE,
	168	MAP_PRIVATE \| MAP_ANONYMOUS, -1, 0);
	169	if (ret == MAP_FAILED) {
	170	free(tmp);
	171	return NULL;
	172	}
	173	memcpy(ret, tmp, preserve_size);
	174	free(tmp);
	175	return ret;
	176	#endif
2446536b	177	}
	178
	179	void plat_munmap(void *ptr, size_t size)
	180	{
	181	if (ptr != NULL)
	182	munmap(ptr, size);
	183	}
	184
c25d78ee	185	int plat_mem_set_exec(void *ptr, size_t size)
c25d78ee	186	{
e8b61936	187	#ifdef _WIN32
	188	int ret = VirtualProtect(ptr,size,PAGE_EXECUTE_READWRITE,0);
	189	if (ret == 0)
	190	lprintf("mprotect(%p, %zd) failed: %d\n", ptr, size, 0);
	191	#else
	192	int ret = mprotect(ptr, size, PROT_READ \| PROT_WRITE \| PROT_EXEC);
	193	if (ret != 0)
	194	lprintf("mprotect(%p, %zd) failed: %d\n", ptr, size, errno);
	195	#endif
c25d78ee	196	return ret;
	197	}
	198
2446536b	199	void emu_video_mode_change(int start_line, int line_count, int is_32cols)
	200	{
	201	memset(vout_buf, 0, 320 * 240 * 2);
	202	vout_width = is_32cols ? 256 : 320;
	203	PicoDrawSetOutBuf(vout_buf, vout_width * 2);
	204	}
	205
	206	void emu_32x_startup(void)
	207	{
2446536b	208	}
	209
	210	#ifndef ANDROID
	211
	212	void lprintf(const char *fmt, ...)
	213	{
	214	va_list list;
	215
	216	va_start(list, fmt);
	217	fprintf(emu_log, "PicoDrive: ");
	218	vfprintf(emu_log, fmt, list);
	219	va_end(list);
	220	fflush(emu_log);
	221	}
	222
	223	#else
	224
	225	#include <android/log.h>
	226
	227	void lprintf(const char *fmt, ...)
	228	{
	229	va_list list;
	230
	231	va_start(list, fmt);
	232	__android_log_vprint(ANDROID_LOG_INFO, "PicoDrive", fmt, list);
	233	va_end(list);
	234	}
	235
	236	#endif
	237
	238	/* libretro */
	239	void retro_set_environment(retro_environment_t cb)
	240	{
	241	static const struct retro_variable vars[] = {
	242	//{ "region", "Region; Auto\|NTSC\|PAL" },
	243	{ NULL, NULL },
	244	};
	245
	246	environ_cb = cb;
	247
	248	cb(RETRO_ENVIRONMENT_SET_VARIABLES, (void *)vars);
	249	}
	250
	251	void retro_set_video_refresh(retro_video_refresh_t cb) { video_cb = cb; }
	252	void retro_set_audio_sample(retro_audio_sample_t cb) { (void)cb; }
	253	void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb) { audio_batch_cb = cb; }
	254	void retro_set_input_poll(retro_input_poll_t cb) { input_poll_cb = cb; }
	255	void retro_set_input_state(retro_input_state_t cb) { input_state_cb = cb; }
	256
	257	unsigned retro_api_version(void)
	258	{
	259	return RETRO_API_VERSION;
	260	}
	261
	262	void retro_set_controller_port_device(unsigned port, unsigned device)
	263	{
	264	}
	265
	266	void retro_get_system_info(struct retro_system_info *info)
	267	{
	268	memset(info, 0, sizeof(*info));
	269	info->library_name = "PicoDrive";
	270	info->library_version = VERSION;
53b2e51c	271	info->valid_extensions = "bin\|gen\|smd\|md\|32x\|cue\|iso\|sms";
2446536b	272	info->need_fullpath = true;
	273	}
	274
	275	void retro_get_system_av_info(struct retro_system_av_info *info)
	276	{
	277	memset(info, 0, sizeof(*info));
	278	info->timing.fps = Pico.m.pal ? 50 : 60;
	279	info->timing.sample_rate = 44100;
	280	info->geometry.base_width = 320;
	281	info->geometry.base_height = 240;
	282	info->geometry.max_width = VOUT_MAX_WIDTH;
	283	info->geometry.max_height = VOUT_MAX_HEIGHT;
	284	info->geometry.aspect_ratio = 4.0 / 3.0;
	285	}
	286
86b38dc4	287	/* savestates */
	288	struct savestate_state {
	289	const char *load_buf;
	290	char *save_buf;
	291	size_t size;
	292	size_t pos;
	293	};
	294
	295	size_t state_read(void p, size_t size, size_t nmemb, void file)
	296	{
	297	struct savestate_state *state = file;
	298	size_t bsize = size * nmemb;
	299
	300	if (state->pos + bsize > state->size) {
	301	lprintf("savestate error: %u/%u\n",
	302	state->pos + bsize, state->size);
	303	bsize = state->size - state->pos;
	304	if ((int)bsize <= 0)
	305	return 0;
	306	}
	307
	308	memcpy(p, state->load_buf + state->pos, bsize);
	309	state->pos += bsize;
	310	return bsize;
	311	}
	312
	313	size_t state_write(void p, size_t size, size_t nmemb, void file)
	314	{
	315	struct savestate_state *state = file;
	316	size_t bsize = size * nmemb;
	317
	318	if (state->pos + bsize > state->size) {
	319	lprintf("savestate error: %u/%u\n",
	320	state->pos + bsize, state->size);
	321	bsize = state->size - state->pos;
	322	if ((int)bsize <= 0)
	323	return 0;
	324	}
	325
	326	memcpy(state->save_buf + state->pos, p, bsize);
	327	state->pos += bsize;
	328	return bsize;
	329	}
	330
	331	size_t state_skip(void p, size_t size, size_t nmemb, void file)
	332	{
	333	struct savestate_state *state = file;
	334	size_t bsize = size * nmemb;
	335
	336	state->pos += bsize;
	337	return bsize;
	338	}
	339
	340	size_t state_eof(void *file)
	341	{
	342	struct savestate_state *state = file;
	343
	344	return state->pos >= state->size;
	345	}
	346
	347	int state_fseek(void *file, long offset, int whence)
	348	{
	349	struct savestate_state *state = file;
	350
351	switch (whence) {
352	case SEEK_SET:
353	state->pos = offset;
354	break;
355	case SEEK_CUR:
356	state->pos += offset;
357	break;
358	case SEEK_END:
359	state->pos = state->size + offset;
360	break;
361	}
362	return (int)state->pos;
363	}
364
365	/* savestate sizes vary wildly depending if cd/32x or
366	* carthw is active, so run the whole thing to get size */
2446536b	367	size_t retro_serialize_size(void)
2446536b	368	{
86b38dc4	369	struct savestate_state state = { 0, };
	370	int ret;
	371
	372	ret = PicoStateFP(&state, 1, NULL, state_skip, NULL, state_fseek);
	373	if (ret != 0)
	374	return 0;
	375
	376	return state.pos;
2446536b	377	}
	378
	379	bool retro_serialize(void *data, size_t size)
	380	{
86b38dc4	381	struct savestate_state state = { 0, };
	382	int ret;
	383
	384	state.save_buf = data;
	385	state.size = size;
	386	state.pos = 0;
	387
	388	ret = PicoStateFP(&state, 1, NULL, state_write,
	389	NULL, state_fseek);
	390	return ret == 0;
2446536b	391	}
	392
	393	bool retro_unserialize(const void *data, size_t size)
	394	{
86b38dc4	395	struct savestate_state state = { 0, };
	396	int ret;
	397
	398	state.load_buf = data;
	399	state.size = size;
	400	state.pos = 0;
	401
	402	ret = PicoStateFP(&state, 0, state_read, NULL,
	403	state_eof, state_fseek);
	404	return ret == 0;
2446536b	405	}
	406
	407	/* cheats - TODO */
	408	void retro_cheat_reset(void)
	409	{
	410	}
	411
	412	void retro_cheat_set(unsigned index, bool enabled, const char *code)
	413	{
	414	}
	415
	416	/* multidisk support */
	417	static bool disk_ejected;
	418	static unsigned int disk_current_index;
	419	static unsigned int disk_count;
	420	static struct disks_state {
	421	char *fname;
	422	} disks[8];
	423
	424	static bool disk_set_eject_state(bool ejected)
	425	{
	426	// TODO?
	427	disk_ejected = ejected;
	428	return true;
	429	}
	430
	431	static bool disk_get_eject_state(void)
	432	{
	433	return disk_ejected;
	434	}
	435
	436	static unsigned int disk_get_image_index(void)
	437	{
	438	return disk_current_index;
	439	}
	440
	441	static bool disk_set_image_index(unsigned int index)
	442	{
	443	cd_img_type cd_type;
	444	int ret;
	445
	446	if (index >= sizeof(disks) / sizeof(disks[0]))
	447	return false;
	448
	449	if (disks[index].fname == NULL) {
	450	lprintf("missing disk #%u\n", index);
	451
	452	// RetroArch specifies "no disk" with index == count,
	453	// so don't fail here..
	454	disk_current_index = index;
	455	return true;
	456	}
	457
	458	lprintf("switching to disk %u: \"%s\"\n", index,
	459	disks[index].fname);
	460
	461	ret = -1;
	462	cd_type = PicoCdCheck(disks[index].fname, NULL);
	463	if (cd_type != CIT_NOT_CD)
	464	ret = Insert_CD(disks[index].fname, cd_type);
	465	if (ret != 0) {
	466	lprintf("Load failed, invalid CD image?\n");
	467	return 0;
	468	}
469
470	disk_current_index = index;
471	return true;
472	}
473
474	static unsigned int disk_get_num_images(void)
475	{
476	return disk_count;
477	}
478
479	static bool disk_replace_image_index(unsigned index,
480	const struct retro_game_info *info)
481	{
482	bool ret = true;
483
484	if (index >= sizeof(disks) / sizeof(disks[0]))
485	return false;
486
487	if (disks[index].fname != NULL)
488	free(disks[index].fname);
489	disks[index].fname = NULL;
490
491	if (info != NULL) {
492	disks[index].fname = strdup(info->path);
493	if (index == disk_current_index)
494	ret = disk_set_image_index(index);
495	}
496
497	return ret;
498	}
499
500	static bool disk_add_image_index(void)
501	{
502	if (disk_count >= sizeof(disks) / sizeof(disks[0]))
503	return false;
504
505	disk_count++;
506	return true;
507	}
508
509	static struct retro_disk_control_callback disk_control = {
510	.set_eject_state = disk_set_eject_state,
511	.get_eject_state = disk_get_eject_state,
512	.get_image_index = disk_get_image_index,
513	.set_image_index = disk_set_image_index,
514	.get_num_images = disk_get_num_images,
515	.replace_image_index = disk_replace_image_index,
516	.add_image_index = disk_add_image_index,
517	};
518
519	static void disk_tray_open(void)
520	{
521	lprintf("cd tray open\n");
522	disk_ejected = 1;
523	}
524
525	static void disk_tray_close(void)
526	{
527	lprintf("cd tray close\n");
528	disk_ejected = 0;
529	}
530
531
532	static const char * const biosfiles_us[] = {
533	"us_scd1_9210", "us_scd2_9306", "SegaCDBIOS9303", "bios_CD_U"
534	};
535	static const char * const biosfiles_eu[] = {
536	"eu_mcd1_9210", "eu_mcd2_9306", "eu_mcd2_9303", "bios_CD_E"
537	};
538	static const char * const biosfiles_jp[] = {
539	"jp_mcd1_9112", "jp_mcd1_9111", "bios_CD_J"
540	};
541
542	static void make_system_path(char *buf, size_t buf_size,
543	const char name, const char ext)
544	{
545	const char *dir = NULL;
546
547	if (environ_cb(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &dir) && dir) {
548	snprintf(buf, buf_size, "%s%c%s%s", dir, SLASH, name, ext);
549	}
550	else {
551	snprintf(buf, buf_size, "%s%s", name, ext);
552	}
553	}
554
555	static const char find_bios(int region, const char *cd_fname)
556	{
557	const char * const *files;
558	static char path[256];
559	int i, count;
560	FILE *f = NULL;
561
562	if (*region == 4) { // US
563	files = biosfiles_us;
564	count = sizeof(biosfiles_us) / sizeof(char *);
565	} else if (*region == 8) { // EU
566	files = biosfiles_eu;
567	count = sizeof(biosfiles_eu) / sizeof(char *);
568	} else if (region == 1 \|\| region == 2) {
569	files = biosfiles_jp;
570	count = sizeof(biosfiles_jp) / sizeof(char *);
571	} else {
572	return NULL;
573	}
574
575	for (i = 0; i < count; i++)
576	{
577	make_system_path(path, sizeof(path), files[i], ".bin");
578	f = fopen(path, "rb");
579	if (f != NULL)
580	break;
581
582	make_system_path(path, sizeof(path), files[i], ".zip");
583	f = fopen(path, "rb");
584	if (f != NULL)
585	break;
586	}
587
588	if (f != NULL) {
589	lprintf("using bios: %s\n", path);
590	fclose(f);
591	return path;
592	}
593
594	return NULL;
595	}
596
597	bool retro_load_game(const struct retro_game_info *info)
598	{
599	enum media_type_e media_type;
600	static char carthw_path[256];
601	size_t i;
602
603	enum retro_pixel_format fmt = RETRO_PIXEL_FORMAT_RGB565;
604	if (!environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt)) {
605	lprintf("RGB565 suppot required, sorry\n");
606	return false;
607	}
608
609	if (info == NULL \|\| info->path == NULL) {
610	lprintf("info->path required\n");
611	return false;
612	}
613
614	for (i = 0; i < sizeof(disks) / sizeof(disks[0]); i++) {
615	if (disks[i].fname != NULL) {
616	free(disks[i].fname);
617	disks[i].fname = NULL;
618	}
619	}
620
621	disk_current_index = 0;
622	disk_count = 1;
623	disks[0].fname = strdup(info->path);
624
625	make_system_path(carthw_path, sizeof(carthw_path), "carthw", ".cfg");
626
627	media_type = PicoLoadMedia(info->path, carthw_path,
628	find_bios, NULL);
629
630	switch (media_type) {
631	case PM_BAD_DETECT:
632	lprintf("Failed to detect ROM/CD image type.\n");
633	return false;
634	case PM_BAD_CD:
635	lprintf("Invalid CD image\n");
636	return false;
637	case PM_BAD_CD_NO_BIOS:
638	lprintf("Missing BIOS\n");
639	return false;
640	case PM_ERROR:
641	lprintf("Load error\n");
642	return false;
643	default:
644	break;
645	}
646
647	PicoLoopPrepare();
648
649	PicoWriteSound = snd_write;
650	memset(sndBuffer, 0, sizeof(sndBuffer));
651	PsndOut = sndBuffer;
652	PsndRerate(1);
653
654	return true;
655	}
656
657	bool retro_load_game_special(unsigned game_type, const struct retro_game_info *info, size_t num_info)
658	{
659	return false;
660	}
661
662	void retro_unload_game(void)
663	{
664	}
665
666	unsigned retro_get_region(void)
667	{
668	return Pico.m.pal ? RETRO_REGION_PAL : RETRO_REGION_NTSC;
669	}
670
671	void *retro_get_memory_data(unsigned id)
672	{
673	if (id != RETRO_MEMORY_SAVE_RAM)
674	return NULL;
675
676	if (PicoAHW & PAHW_MCD)
677	return Pico_mcd->bram;
678	else
679	return SRam.data;
680	}
681
682	size_t retro_get_memory_size(unsigned id)
683	{
684	if (id != RETRO_MEMORY_SAVE_RAM)
685	return 0;
686
687	if (PicoAHW & PAHW_MCD)
688	// bram
689	return 0x2000;
690	else
691	return SRam.size;
692	}
693
694	void retro_reset(void)
695	{
696	PicoReset();
697	}
698
699	static const unsigned short retro_pico_map[] = {
700	[RETRO_DEVICE_ID_JOYPAD_B] = 1 << GBTN_B,
701	[RETRO_DEVICE_ID_JOYPAD_Y] = 1 << GBTN_A,
702	[RETRO_DEVICE_ID_JOYPAD_SELECT] = 1 << GBTN_MODE,
703	[RETRO_DEVICE_ID_JOYPAD_START] = 1 << GBTN_START,
704	[RETRO_DEVICE_ID_JOYPAD_UP] = 1 << GBTN_UP,
705	[RETRO_DEVICE_ID_JOYPAD_DOWN] = 1 << GBTN_DOWN,
706	[RETRO_DEVICE_ID_JOYPAD_LEFT] = 1 << GBTN_LEFT,
707	[RETRO_DEVICE_ID_JOYPAD_RIGHT] = 1 << GBTN_RIGHT,
708	[RETRO_DEVICE_ID_JOYPAD_A] = 1 << GBTN_C,
709	[RETRO_DEVICE_ID_JOYPAD_X] = 1 << GBTN_Y,
710	[RETRO_DEVICE_ID_JOYPAD_L] = 1 << GBTN_X,
711	[RETRO_DEVICE_ID_JOYPAD_R] = 1 << GBTN_Z,
712	};
713	#define RETRO_PICO_MAP_LEN (sizeof(retro_pico_map) / sizeof(retro_pico_map[0]))
714
715	static void snd_write(int len)
716	{
717	audio_batch_cb(PsndOut, len / 4);
718	}
719
720	void retro_run(void)
721	{
722	bool updated = false;
723	int pad, i;
724
725	if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
726	; //update_variables(true);
727
728	input_poll_cb();
729
730	PicoPad[0] = PicoPad[1] = 0;
731	for (pad = 0; pad < 2; pad++)
732	for (i = 0; i < RETRO_PICO_MAP_LEN; i++)
733	if (input_state_cb(pad, RETRO_DEVICE_JOYPAD, 0, i))
734	PicoPad[pad] \|= retro_pico_map[i];
735
736	PicoFrame();
737
738	video_cb(vout_buf, vout_width, vout_height, vout_width * 2);
739	}
740
741	void retro_init(void)
742	{
743	int level;
744
745	#ifdef IOS
746	emu_log = fopen("/User/Documents/PicoDrive.log", "w");
747	if (emu_log == NULL)
748	emu_log = fopen("PicoDrive.log", "w");
749	if (emu_log == NULL)
750	#endif
751	emu_log = stdout;
752
753	level = 0;
754	environ_cb(RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL, &level);
755
756	environ_cb(RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE, &disk_control);
757
758	PicoOpt = POPT_EN_STEREO\|POPT_EN_FM\|POPT_EN_PSG\|POPT_EN_Z80
720bfc5d	759	\| POPT_EN_MCD_PCM\|POPT_EN_MCD_CDDA\|POPT_EN_MCD_GFX
	760	\| POPT_EN_32X\|POPT_EN_PWM
	761	\| POPT_ACC_SPRITES\|POPT_DIS_32C_BORDER;
	762	#ifdef __arm__
	763	PicoOpt \|= POPT_EN_SVP_DRC;
	764	#endif
2446536b	765	PsndRate = 44100;
	766	PicoAutoRgnOrder = 0x184; // US, EU, JP
	767	PicoCDBuffers = 0;
	768
2446536b	769	vout_width = 320;
	770	vout_height = 240;
	771	vout_buf = malloc(VOUT_MAX_WIDTH * VOUT_MAX_HEIGHT * 2);
	772
	773	PicoInit();
41946d70	774	PicoDrawSetOutFormat(PDF_RGB555, 0);
2446536b	775	PicoDrawSetOutBuf(vout_buf, vout_width * 2);
	776
	777	//PicoMessage = plat_status_msg_busy_next;
	778	PicoMCDopenTray = disk_tray_open;
	779	PicoMCDcloseTray = disk_tray_close;
	780	}
	781
	782	void retro_deinit(void)
	783	{
	784	PicoExit();
	785	}