[libpicofe.git] / linux / emu.c

// (c) Copyright 2006-2009 notaz, All rights reserved.\r
// Free for non-commercial use.\r
\r
// For commercial use, separate licencing terms must be obtained.\r
\r
#include <stdio.h>\r
#include <unistd.h>\r
\r
#include "../common/emu.h"\r
#include "../common/menu.h"\r
#include "../common/plat.h"\r
#include "../common/arm_utils.h"\r
#include "../linux/sndout_oss.h"\r
#include "version.h"\r
\r
#include <pico/pico_int.h>\r
\r
\r
static short __attribute__((aligned(4))) sndBuffer[2*44100/50];\r
const char *renderer_names[] = { "16bit accurate", " 8bit accurate", " 8bit fast", NULL };\r
const char *renderer_names32x[] = { "accurate", "faster", "fastest", NULL };\r
enum renderer_types { RT_16BIT, RT_8BIT_ACC, RT_8BIT_FAST, RT_COUNT };\r
\r
\r
void pemu_prep_defconfig(void)\r
{\r
}\r
\r
void pemu_validate_config(void)\r
{\r
	extern int PicoOpt;\r
//	PicoOpt &= ~POPT_EXT_FM;\r
	PicoOpt &= ~POPT_EN_SVP_DRC;\r
}\r
\r
// FIXME: dupes from GP2X, need cleanup\r
static void (*osd_text)(int x, int y, const char *text);\r
\r
/*\r
static void osd_text8(int x, int y, const char *text)\r
{\r
	int len = strlen(text)*8;\r
	int *p, i, h, offs;\r
\r
	len = (len+3) >> 2;\r
	for (h = 0; h < 8; h++) {\r
		offs = (x + g_screen_width * (y+h)) & ~3;\r
		p = (int *) ((char *)g_screen_ptr + offs);\r
		for (i = len; i; i--, p++)\r
			*p = 0xe0e0e0e0;\r
	}\r
	emu_text_out8(x, y, text);\r
}\r
*/\r
\r
static void osd_text16(int x, int y, const char *text)\r
{\r
	int len = strlen(text)*8;\r
	int *p, i, h, offs;\r
\r
	len = (len+1) >> 1;\r
	for (h = 0; h < 8; h++) {\r
		offs = (x + g_screen_width * (y+h)) & ~1;\r
		p = (int *) ((short *)g_screen_ptr + offs);\r
		for (i = len; i; i--, p++)\r
			*p = (*p >> 2) & 0x39e7;\r
	}\r
	emu_text_out16(x, y, text);\r
}\r
\r
static void draw_cd_leds(void)\r
{\r
	int led_reg, pitch, scr_offs, led_offs;\r
	led_reg = Pico_mcd->s68k_regs[0];\r
\r
	pitch = 320;\r
	led_offs = 4;\r
	scr_offs = pitch * 2 + 4;\r
\r
	if (currentConfig.renderer != RT_16BIT) {\r
	#define p(x) px[(x) >> 2]\r
		// 8-bit modes\r
		unsigned int *px = (unsigned int *)((char *)g_screen_ptr + scr_offs);\r
		unsigned int col_g = (led_reg & 2) ? 0xc0c0c0c0 : 0xe0e0e0e0;\r
		unsigned int col_r = (led_reg & 1) ? 0xd0d0d0d0 : 0xe0e0e0e0;\r
		p(pitch*0) = p(pitch*1) = p(pitch*2) = col_g;\r
		p(pitch*0 + led_offs) = p(pitch*1 + led_offs) = p(pitch*2 + led_offs) = col_r;\r
	#undef p\r
	} else {\r
	#define p(x) px[(x)*2 >> 2] = px[((x)*2 >> 2) + 1]\r
		// 16-bit modes\r
		unsigned int *px = (unsigned int *)((short *)g_screen_ptr + scr_offs);\r
		unsigned int col_g = (led_reg & 2) ? 0x06000600 : 0;\r
		unsigned int col_r = (led_reg & 1) ? 0xc000c000 : 0;\r
		p(pitch*0) = p(pitch*1) = p(pitch*2) = col_g;\r
		p(pitch*0 + led_offs) = p(pitch*1 + led_offs) = p(pitch*2 + led_offs) = col_r;\r
	#undef p\r
	}\r
}\r
\r
void pemu_finalize_frame(const char *fps, const char *notice)\r
{\r
	if (currentConfig.renderer != RT_16BIT && !(PicoAHW & PAHW_32X)) {\r
		unsigned short *pd = (unsigned short *)g_screen_ptr + 8 * g_screen_width;\r
		unsigned char *ps = PicoDraw2FB + 328*8 + 8;\r
		unsigned short *pal = HighPal;\r
		int i, x;\r
		if (Pico.m.dirtyPal)\r
			PicoDrawUpdateHighPal();\r
		for (i = 0; i < 224; i++, ps += 8)\r
			for (x = 0; x < 320; x++)\r
				*pd++ = pal[*ps++];\r
	}\r
\r
	if (notice || (currentConfig.EmuOpt & EOPT_SHOW_FPS)) {\r
		if (notice)\r
			osd_text(4, g_screen_height - 8, notice);\r
		if (currentConfig.EmuOpt & EOPT_SHOW_FPS)\r
			osd_text(g_screen_width - 60, g_screen_height - 8, fps);\r
	}\r
	if ((PicoAHW & PAHW_MCD) && (currentConfig.EmuOpt & EOPT_EN_CD_LEDS))\r
		draw_cd_leds();\r
}\r
\r
static void apply_renderer(void)\r
{\r
	switch (currentConfig.renderer) {\r
	case RT_16BIT:\r
		PicoOpt &= ~POPT_ALT_RENDERER;\r
		PicoDrawSetOutFormat(PDF_RGB555, 0);\r
		PicoDrawSetOutBuf(g_screen_ptr, g_screen_width * 2);\r
		break;\r
	case RT_8BIT_ACC:\r
		PicoOpt &= ~POPT_ALT_RENDERER;\r
		PicoDrawSetOutFormat(PDF_8BIT, 0);\r
		PicoDrawSetOutBuf(PicoDraw2FB + 8, 328);\r
		break;\r
	case RT_8BIT_FAST:\r
		PicoOpt |=  POPT_ALT_RENDERER;\r
		PicoDrawSetOutFormat(PDF_NONE, 0);\r
		break;\r
	}\r
\r
	if (PicoAHW & PAHW_32X) {\r
		int only_32x = 0;\r
		if (currentConfig.renderer == RT_16BIT)\r
			only_32x = 1;\r
		else\r
			PicoDrawSetOutFormat(PDF_NONE, 0);\r
		PicoDraw32xSetFrameMode(1, only_32x);\r
		PicoDrawSetOutBuf(g_screen_ptr, g_screen_width * 2);\r
	}\r
	//PicoDraw32xSetFrameMode(0, 0);\r
	//PicoDrawSetOutFormat(PDF_RGB555, 1);\r
}\r
\r
void plat_video_toggle_renderer(int change, int is_menu)\r
{\r
	currentConfig.renderer += change;\r
	if      (currentConfig.renderer >= RT_COUNT)\r
		currentConfig.renderer = 0;\r
	else if (currentConfig.renderer < 0)\r
		currentConfig.renderer = RT_COUNT - 1;\r
\r
	if (!is_menu)\r
		apply_renderer();\r
\r
	emu_status_msg(renderer_names[currentConfig.renderer]);\r
}\r
\r
void plat_video_menu_enter(int is_rom_loaded)\r
{\r
}\r
\r
void plat_video_menu_begin(void)\r
{\r
	memcpy32(g_screen_ptr, g_menubg_ptr, g_screen_width * g_screen_height * 2 / 4);\r
	g_menuscreen_ptr = g_screen_ptr;\r
}\r
\r
void plat_video_menu_end(void)\r
{\r
	plat_video_flip();\r
}\r
\r
void plat_status_msg_clear(void)\r
{\r
	unsigned short *d = (unsigned short *)g_screen_ptr + g_screen_width * g_screen_height;\r
	int l = g_screen_width * 8;\r
	memset32((int *)(d - l), 0, l * 2 / 4);\r
}\r
\r
void plat_status_msg_busy_next(const char *msg)\r
{\r
	plat_status_msg_clear();\r
	pemu_finalize_frame("", msg);\r
	plat_video_flip();\r
	emu_status_msg("");\r
	reset_timing = 1;\r
}\r
\r
void plat_status_msg_busy_first(const char *msg)\r
{\r
//	memset32(g_screen_ptr, 0, g_screen_width * g_screen_height * 2 / 4);\r
	plat_status_msg_busy_next(msg);\r
}\r
\r
void plat_update_volume(int has_changed, int is_up)\r
{\r
}\r
\r
void pemu_forced_frame(int opts, int no_scale)\r
{\r
	int po_old = PicoOpt;\r
	int eo_old = currentConfig.EmuOpt;\r
\r
	PicoOpt &= ~POPT_ALT_RENDERER;\r
	PicoOpt |= opts|POPT_ACC_SPRITES; // acc_sprites\r
\r
	PicoDrawSetOutFormat(PDF_RGB555, 1);\r
	PicoDrawSetOutBuf(g_screen_ptr, g_screen_width * 2);\r
	PicoDraw32xSetFrameMode(0, 0);\r
\r
	Pico.m.dirtyPal = 1;\r
	PicoFrameDrawOnly();\r
\r
	PicoOpt = po_old;\r
	currentConfig.EmuOpt = eo_old;\r
}\r
\r
static void updateSound(int len)\r
{\r
	len <<= 1;\r
	if (PicoOpt & POPT_EN_STEREO)\r
		len <<= 1;\r
\r
	if ((currentConfig.EmuOpt & EOPT_NO_FRMLIMIT) && !sndout_oss_can_write(len))\r
		return;\r
\r
	/* avoid writing audio when lagging behind to prevent audio lag */\r
	if (PicoSkipFrame != 2)\r
		sndout_oss_write(PsndOut, len);\r
}\r
\r
void pemu_sound_start(void)\r
{\r
	int target_fps = Pico.m.pal ? 50 : 60;\r
\r
	PsndOut = NULL;\r
\r
	if (currentConfig.EmuOpt & EOPT_EN_SOUND)\r
	{\r
		int snd_excess_add, frame_samples;\r
		int is_stereo = (PicoOpt & POPT_EN_STEREO) ? 1 : 0;\r
\r
		PsndRerate(Pico.m.frame_count ? 1 : 0);\r
\r
		frame_samples = PsndLen;\r
		snd_excess_add = ((PsndRate - PsndLen * target_fps)<<16) / target_fps;\r
		if (snd_excess_add != 0)\r
			frame_samples++;\r
\r
		printf("starting audio: %i len: %i (ex: %04x) stereo: %i, pal: %i\n",\r
			PsndRate, PsndLen, snd_excess_add, is_stereo, Pico.m.pal);\r
		sndout_oss_start(PsndRate, frame_samples, is_stereo);\r
		sndout_oss_setvol(currentConfig.volume, currentConfig.volume);\r
		PicoWriteSound = updateSound;\r
		plat_update_volume(0, 0);\r
		memset(sndBuffer, 0, sizeof(sndBuffer));\r
		PsndOut = sndBuffer;\r
	}\r
}\r
\r
void pemu_sound_stop(void)\r
{\r
}\r
\r
void pemu_sound_wait(void)\r
{\r
	// don't need to do anything, writes will block by themselves\r
}\r
\r
void plat_debug_cat(char *str)\r
{\r
}\r
\r
void emu_video_mode_change(int start_line, int line_count, int is_32cols)\r
{\r
	// clear whole screen in all buffers\r
	memset32(g_screen_ptr, 0, g_screen_width * g_screen_height * 2 / 4);\r
}\r
\r
void pemu_loop_prep(void)\r
{\r
	apply_renderer();\r
	osd_text = osd_text16;\r
\r
	pemu_sound_start();\r
}\r
\r
void pemu_loop_end(void)\r
{\r
	int po_old = PicoOpt;\r
	int eo_old = currentConfig.EmuOpt;\r
\r
	pemu_sound_stop();\r
	memset32(g_screen_ptr, 0, g_screen_width * g_screen_height * 2 / 4);\r
\r
	/* do one more frame for menu bg */\r
	PicoOpt &= ~POPT_ALT_RENDERER;\r
	PicoOpt |= POPT_EN_SOFTSCALE|POPT_ACC_SPRITES;\r
\r
	PicoDrawSetOutFormat(PDF_RGB555, 1);\r
	PicoDrawSetOutBuf(g_screen_ptr, g_screen_width * 2);\r
	PicoDraw32xSetFrameMode(0, 0);\r
	Pico.m.dirtyPal = 1;\r
	PicoFrame();\r
\r
	PicoOpt = po_old;\r
	currentConfig.EmuOpt = eo_old;\r
}\r
\r
void plat_wait_till_us(unsigned int us_to)\r
{\r
	unsigned int now;\r
\r
	now = plat_get_ticks_us();\r
\r
	while ((signed int)(us_to - now) > 512)\r
	{\r
		usleep(1024);\r
		now = plat_get_ticks_us();\r
	}\r
}\r
\r
const char *plat_get_credits(void)\r
{\r
	return "PicoDrive v" VERSION " (c) notaz, 2006-2009\n\n\n"\r
		"Credits:\n"\r
		"fDave: Cyclone 68000 core,\n"\r
		"      base code of PicoDrive\n"\r
		"Reesy & FluBBa: DrZ80 core\n"\r
		"MAME devs: YM2612 and SN76496 cores\n"\r
		"rlyeh and others: minimal SDK\n"\r
		"Squidge: mmuhack\n"\r
		"Dzz: ARM940 sample\n"\r
		"GnoStiC / Puck2099: USB joy code\n"\r
		"craigix: GP2X hardware\n"\r
		"ketchupgun: skin design\n"\r
		"\n"\r
		"special thanks (for docs, ideas):\n"\r
		" Charles MacDonald, Haze,\n"\r
		" Stephane Dallongeville,\n"\r
		" Lordus, Exophase, Rokas,\n"\r
		" Nemesis, Tasco Deluxe";\r
}\r
Commit	Line	Data
d2f29611	1	// (c) Copyright 2006-2009 notaz, All rights reserved.\r
	2	// Free for non-commercial use.\r
	3	\r
	4	// For commercial use, separate licencing terms must be obtained.\r
	5	\r
	6	#include <stdio.h>\r
	7	#include <unistd.h>\r
	8	\r
	9	#include "../common/emu.h"\r
	10	#include "../common/menu.h"\r
	11	#include "../common/plat.h"\r
	12	#include "../common/arm_utils.h"\r
	13	#include "../linux/sndout_oss.h"\r
	14	#include "version.h"\r
	15	\r
	16	#include <pico/pico_int.h>\r
	17	\r
	18	\r
	19	static short __attribute__((aligned(4))) sndBuffer[2*44100/50];\r
0c9ae592	20	const char *renderer_names[] = { "16bit accurate", " 8bit accurate", " 8bit fast", NULL };\r
0c9ae592	21	const char *renderer_names32x[] = { "accurate", "faster", "fastest", NULL };\r
662e622b	22	enum renderer_types { RT_16BIT, RT_8BIT_ACC, RT_8BIT_FAST, RT_COUNT };\r
d2f29611	23	\r
d2f29611	24	\r
	25	void pemu_prep_defconfig(void)\r
	26	{\r
d2f29611	27	}\r
	28	\r
	29	void pemu_validate_config(void)\r
	30	{\r
	31	extern int PicoOpt;\r
	32	// PicoOpt &= ~POPT_EXT_FM;\r
	33	PicoOpt &= ~POPT_EN_SVP_DRC;\r
	34	}\r
	35	\r
	36	// FIXME: dupes from GP2X, need cleanup\r
	37	static void (osd_text)(int x, int y, const char text);\r
	38	\r
b188c2b6	39	/*\r
d2f29611	40	static void osd_text8(int x, int y, const char *text)\r
	41	{\r
	42	int len = strlen(text)*8;\r
	43	int *p, i, h, offs;\r
	44	\r
	45	len = (len+3) >> 2;\r
	46	for (h = 0; h < 8; h++) {\r
	47	offs = (x + g_screen_width * (y+h)) & ~3;\r
	48	p = (int ) ((char )g_screen_ptr + offs);\r
	49	for (i = len; i; i--, p++)\r
	50	*p = 0xe0e0e0e0;\r
	51	}\r
	52	emu_text_out8(x, y, text);\r
	53	}\r
b188c2b6	54	*/\r
d2f29611	55	\r
	56	static void osd_text16(int x, int y, const char *text)\r
	57	{\r
	58	int len = strlen(text)*8;\r
	59	int *p, i, h, offs;\r
	60	\r
	61	len = (len+1) >> 1;\r
	62	for (h = 0; h < 8; h++) {\r
	63	offs = (x + g_screen_width * (y+h)) & ~1;\r
	64	p = (int ) ((short )g_screen_ptr + offs);\r
	65	for (i = len; i; i--, p++)\r
	66	p = (p >> 2) & 0x39e7;\r
	67	}\r
	68	emu_text_out16(x, y, text);\r
	69	}\r
	70	\r
	71	static void draw_cd_leds(void)\r
	72	{\r
	73	int led_reg, pitch, scr_offs, led_offs;\r
	74	led_reg = Pico_mcd->s68k_regs[0];\r
	75	\r
	76	pitch = 320;\r
	77	led_offs = 4;\r
	78	scr_offs = pitch * 2 + 4;\r
	79	\r
662e622b	80	if (currentConfig.renderer != RT_16BIT) {\r
d2f29611	81	#define p(x) px[(x) >> 2]\r
	82	// 8-bit modes\r
	83	unsigned int px = (unsigned int )((char *)g_screen_ptr + scr_offs);\r
	84	unsigned int col_g = (led_reg & 2) ? 0xc0c0c0c0 : 0xe0e0e0e0;\r
	85	unsigned int col_r = (led_reg & 1) ? 0xd0d0d0d0 : 0xe0e0e0e0;\r
	86	p(pitch0) = p(pitch1) = p(pitch*2) = col_g;\r
	87	p(pitch0 + led_offs) = p(pitch1 + led_offs) = p(pitch*2 + led_offs) = col_r;\r
	88	#undef p\r
	89	} else {\r
	90	#define p(x) px[(x)2 >> 2] = px[((x)2 >> 2) + 1]\r
	91	// 16-bit modes\r
	92	unsigned int px = (unsigned int )((short *)g_screen_ptr + scr_offs);\r
	93	unsigned int col_g = (led_reg & 2) ? 0x06000600 : 0;\r
	94	unsigned int col_r = (led_reg & 1) ? 0xc000c000 : 0;\r
	95	p(pitch0) = p(pitch1) = p(pitch*2) = col_g;\r
	96	p(pitch0 + led_offs) = p(pitch1 + led_offs) = p(pitch*2 + led_offs) = col_r;\r
	97	#undef p\r
	98	}\r
	99	}\r
	100	\r
b188c2b6	101	void pemu_finalize_frame(const char fps, const char notice)\r
d2f29611	102	{\r
662e622b	103	if (currentConfig.renderer != RT_16BIT && !(PicoAHW & PAHW_32X)) {\r
	104	unsigned short pd = (unsigned short )g_screen_ptr + 8 * g_screen_width;\r
	105	unsigned char ps = PicoDraw2FB + 3288 + 8;\r
	106	unsigned short *pal = HighPal;\r
	107	int i, x;\r
	108	if (Pico.m.dirtyPal)\r
	109	PicoDrawUpdateHighPal();\r
	110	for (i = 0; i < 224; i++, ps += 8)\r
	111	for (x = 0; x < 320; x++)\r
	112	pd++ = pal[ps++];\r
	113	}\r
	114	\r
d2f29611	115	if (notice \|\| (currentConfig.EmuOpt & EOPT_SHOW_FPS)) {\r
	116	if (notice)\r
	117	osd_text(4, g_screen_height - 8, notice);\r
	118	if (currentConfig.EmuOpt & EOPT_SHOW_FPS)\r
b188c2b6	119	osd_text(g_screen_width - 60, g_screen_height - 8, fps);\r
d2f29611	120	}\r
	121	if ((PicoAHW & PAHW_MCD) && (currentConfig.EmuOpt & EOPT_EN_CD_LEDS))\r
	122	draw_cd_leds();\r
d2f29611	123	}\r
d2f29611	124	\r
662e622b	125	static void apply_renderer(void)\r
662e622b	126	{\r
662e622b	127	switch (currentConfig.renderer) {\r
	128	case RT_16BIT:\r
	129	PicoOpt &= ~POPT_ALT_RENDERER;\r
	130	PicoDrawSetOutFormat(PDF_RGB555, 0);\r
	131	PicoDrawSetOutBuf(g_screen_ptr, g_screen_width * 2);\r
	132	break;\r
	133	case RT_8BIT_ACC:\r
	134	PicoOpt &= ~POPT_ALT_RENDERER;\r
	135	PicoDrawSetOutFormat(PDF_8BIT, 0);\r
	136	PicoDrawSetOutBuf(PicoDraw2FB + 8, 328);\r
	137	break;\r
	138	case RT_8BIT_FAST:\r
	139	PicoOpt \|= POPT_ALT_RENDERER;\r
	140	PicoDrawSetOutFormat(PDF_NONE, 0);\r
	141	break;\r
	142	}\r
	143	\r
	144	if (PicoAHW & PAHW_32X) {\r
	145	int only_32x = 0;\r
	146	if (currentConfig.renderer == RT_16BIT)\r
	147	only_32x = 1;\r
	148	else\r
	149	PicoDrawSetOutFormat(PDF_NONE, 0);\r
	150	PicoDraw32xSetFrameMode(1, only_32x);\r
	151	PicoDrawSetOutBuf(g_screen_ptr, g_screen_width * 2);\r
	152	}\r
a41b3b44	153	//PicoDraw32xSetFrameMode(0, 0);\r
a41b3b44	154	//PicoDrawSetOutFormat(PDF_RGB555, 1);\r
662e622b	155	}\r
	156	\r
	157	void plat_video_toggle_renderer(int change, int is_menu)\r
d2f29611	158	{\r
662e622b	159	currentConfig.renderer += change;\r
	160	if (currentConfig.renderer >= RT_COUNT)\r
	161	currentConfig.renderer = 0;\r
	162	else if (currentConfig.renderer < 0)\r
	163	currentConfig.renderer = RT_COUNT - 1;\r
	164	\r
	165	if (!is_menu)\r
	166	apply_renderer();\r
	167	\r
	168	emu_status_msg(renderer_names[currentConfig.renderer]);\r
d2f29611	169	}\r
	170	\r
	171	void plat_video_menu_enter(int is_rom_loaded)\r
	172	{\r
	173	}\r
	174	\r
	175	void plat_video_menu_begin(void)\r
	176	{\r
	177	memcpy32(g_screen_ptr, g_menubg_ptr, g_screen_width * g_screen_height * 2 / 4);\r
c4046e6e	178	g_menuscreen_ptr = g_screen_ptr;\r
d2f29611	179	}\r
	180	\r
	181	void plat_video_menu_end(void)\r
	182	{\r
b188c2b6	183	plat_video_flip();\r
d2f29611	184	}\r
	185	\r
	186	void plat_status_msg_clear(void)\r
	187	{\r
	188	unsigned short d = (unsigned short )g_screen_ptr + g_screen_width * g_screen_height;\r
	189	int l = g_screen_width * 8;\r
	190	memset32((int )(d - l), 0, l 2 / 4);\r
	191	}\r
	192	\r
	193	void plat_status_msg_busy_next(const char *msg)\r
	194	{\r
	195	plat_status_msg_clear();\r
b188c2b6	196	pemu_finalize_frame("", msg);\r
b188c2b6	197	plat_video_flip();\r
d2f29611	198	emu_status_msg("");\r
	199	reset_timing = 1;\r
	200	}\r
	201	\r
	202	void plat_status_msg_busy_first(const char *msg)\r
	203	{\r
	204	// memset32(g_screen_ptr, 0, g_screen_width * g_screen_height * 2 / 4);\r
	205	plat_status_msg_busy_next(msg);\r
	206	}\r
	207	\r
	208	void plat_update_volume(int has_changed, int is_up)\r
	209	{\r
	210	}\r
	211	\r
209a7eff	212	void pemu_forced_frame(int opts, int no_scale)\r
d2f29611	213	{\r
	214	int po_old = PicoOpt;\r
	215	int eo_old = currentConfig.EmuOpt;\r
	216	\r
	217	PicoOpt &= ~POPT_ALT_RENDERER;\r
	218	PicoOpt \|= opts\|POPT_ACC_SPRITES; // acc_sprites\r
d2f29611	219	\r
a41b3b44	220	PicoDrawSetOutFormat(PDF_RGB555, 1);\r
	221	PicoDrawSetOutBuf(g_screen_ptr, g_screen_width * 2);\r
	222	PicoDraw32xSetFrameMode(0, 0);\r
d2f29611	223	\r
	224	Pico.m.dirtyPal = 1;\r
	225	PicoFrameDrawOnly();\r
	226	\r
	227	PicoOpt = po_old;\r
	228	currentConfig.EmuOpt = eo_old;\r
	229	}\r
	230	\r
	231	static void updateSound(int len)\r
	232	{\r
	233	len <<= 1;\r
	234	if (PicoOpt & POPT_EN_STEREO)\r
	235	len <<= 1;\r
	236	\r
	237	if ((currentConfig.EmuOpt & EOPT_NO_FRMLIMIT) && !sndout_oss_can_write(len))\r
	238	return;\r
	239	\r
	240	/* avoid writing audio when lagging behind to prevent audio lag */\r
	241	if (PicoSkipFrame != 2)\r
	242	sndout_oss_write(PsndOut, len);\r
	243	}\r
	244	\r
	245	void pemu_sound_start(void)\r
	246	{\r
d2f29611	247	int target_fps = Pico.m.pal ? 50 : 60;\r
	248	\r
	249	PsndOut = NULL;\r
	250	\r
	251	if (currentConfig.EmuOpt & EOPT_EN_SOUND)\r
	252	{\r
b188c2b6	253	int snd_excess_add, frame_samples;\r
	254	int is_stereo = (PicoOpt & POPT_EN_STEREO) ? 1 : 0;\r
	255	\r
	256	PsndRerate(Pico.m.frame_count ? 1 : 0);\r
	257	\r
	258	frame_samples = PsndLen;\r
	259	snd_excess_add = ((PsndRate - PsndLen * target_fps)<<16) / target_fps;\r
	260	if (snd_excess_add != 0)\r
	261	frame_samples++;\r
d2f29611	262	\r
d2f29611	263	printf("starting audio: %i len: %i (ex: %04x) stereo: %i, pal: %i\n",\r
b188c2b6	264	PsndRate, PsndLen, snd_excess_add, is_stereo, Pico.m.pal);\r
b188c2b6	265	sndout_oss_start(PsndRate, frame_samples, is_stereo);\r
d2f29611	266	sndout_oss_setvol(currentConfig.volume, currentConfig.volume);\r
	267	PicoWriteSound = updateSound;\r
	268	plat_update_volume(0, 0);\r
	269	memset(sndBuffer, 0, sizeof(sndBuffer));\r
	270	PsndOut = sndBuffer;\r
d2f29611	271	}\r
	272	}\r
	273	\r
	274	void pemu_sound_stop(void)\r
	275	{\r
	276	}\r
	277	\r
	278	void pemu_sound_wait(void)\r
	279	{\r
	280	// don't need to do anything, writes will block by themselves\r
	281	}\r
	282	\r
	283	void plat_debug_cat(char *str)\r
	284	{\r
	285	}\r
	286	\r
	287	void emu_video_mode_change(int start_line, int line_count, int is_32cols)\r
	288	{\r
d2f29611	289	// clear whole screen in all buffers\r
	290	memset32(g_screen_ptr, 0, g_screen_width * g_screen_height * 2 / 4);\r
	291	}\r
	292	\r
	293	void pemu_loop_prep(void)\r
	294	{\r
662e622b	295	apply_renderer();\r
d2f29611	296	osd_text = osd_text16;\r
	297	\r
	298	pemu_sound_start();\r
	299	}\r
	300	\r
	301	void pemu_loop_end(void)\r
	302	{\r
	303	int po_old = PicoOpt;\r
	304	int eo_old = currentConfig.EmuOpt;\r
	305	\r
	306	pemu_sound_stop();\r
	307	memset32(g_screen_ptr, 0, g_screen_width * g_screen_height * 2 / 4);\r
	308	\r
	309	/* do one more frame for menu bg */\r
	310	PicoOpt &= ~POPT_ALT_RENDERER;\r
	311	PicoOpt \|= POPT_EN_SOFTSCALE\|POPT_ACC_SPRITES;\r
d2f29611	312	\r
a41b3b44	313	PicoDrawSetOutFormat(PDF_RGB555, 1);\r
	314	PicoDrawSetOutBuf(g_screen_ptr, g_screen_width * 2);\r
	315	PicoDraw32xSetFrameMode(0, 0);\r
d2f29611	316	Pico.m.dirtyPal = 1;\r
	317	PicoFrame();\r
	318	\r
	319	PicoOpt = po_old;\r
	320	currentConfig.EmuOpt = eo_old;\r
	321	}\r
	322	\r
	323	void plat_wait_till_us(unsigned int us_to)\r
	324	{\r
	325	unsigned int now;\r
	326	\r
	327	now = plat_get_ticks_us();\r
	328	\r
	329	while ((signed int)(us_to - now) > 512)\r
	330	{\r
	331	usleep(1024);\r
	332	now = plat_get_ticks_us();\r
	333	}\r
	334	}\r
	335	\r
d2f29611	336	const char *plat_get_credits(void)\r
	337	{\r
	338	return "PicoDrive v" VERSION " (c) notaz, 2006-2009\n\n\n"\r
	339	"Credits:\n"\r
	340	"fDave: Cyclone 68000 core,\n"\r
	341	" base code of PicoDrive\n"\r
	342	"Reesy & FluBBa: DrZ80 core\n"\r
	343	"MAME devs: YM2612 and SN76496 cores\n"\r
	344	"rlyeh and others: minimal SDK\n"\r
	345	"Squidge: mmuhack\n"\r
	346	"Dzz: ARM940 sample\n"\r
	347	"GnoStiC / Puck2099: USB joy code\n"\r
	348	"craigix: GP2X hardware\n"\r
	349	"ketchupgun: skin design\n"\r
	350	"\n"\r
	351	"special thanks (for docs, ideas):\n"\r
	352	" Charles MacDonald, Haze,\n"\r
	353	" Stephane Dallongeville,\n"\r
	354	" Lordus, Exophase, Rokas,\n"\r
	355	" Nemesis, Tasco Deluxe";\r
	356	}\r