initial libretro port

platform/libretro.c

@@ -0,0 +1,588 @@
+/*
+ * 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>
+#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)
+		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);
+}
+
+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|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_SVP_DRC
+		| POPT_ACC_SPRITES|POPT_EN_32X|POPT_EN_PWM
+		| POPT_DIS_32C_BORDER;
+	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();
+}