[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
char cpu_clk_name[] = "unused";\r
const char *renderer_names_[] = { "16bit accurate", " 8bit accurate", "     8bit fast", NULL };\r
const char *renderer_names32x_[] = { "accurate", "faster  ", "fastest ", NULL };\r
const char **renderer_names = renderer_names_;\r
const char **renderer_names32x = renderer_names32x_;\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
	PicoScanBegin = NULL;\r
	PicoScanEnd = NULL;\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
}\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
}\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)\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, 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, 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
d2f29611	20	char cpu_clk_name[] = "unused";\r
662e622b	21	const char *renderer_names_[] = { "16bit accurate", " 8bit accurate", " 8bit fast", NULL };\r
	22	const char *renderer_names32x_[] = { "accurate", "faster ", "fastest ", NULL };\r
	23	const char **renderer_names = renderer_names_;\r
	24	const char **renderer_names32x = renderer_names32x_;\r
	25	enum renderer_types { RT_16BIT, RT_8BIT_ACC, RT_8BIT_FAST, RT_COUNT };\r
d2f29611	26	\r
d2f29611	27	\r
	28	void pemu_prep_defconfig(void)\r
	29	{\r
d2f29611	30	}\r
	31	\r
	32	void pemu_validate_config(void)\r
	33	{\r
	34	extern int PicoOpt;\r
	35	// PicoOpt &= ~POPT_EXT_FM;\r
	36	PicoOpt &= ~POPT_EN_SVP_DRC;\r
	37	}\r
	38	\r
	39	// FIXME: dupes from GP2X, need cleanup\r
	40	static void (osd_text)(int x, int y, const char text);\r
	41	\r
b188c2b6	42	/*\r
d2f29611	43	static void osd_text8(int x, int y, const char *text)\r
	44	{\r
	45	int len = strlen(text)*8;\r
	46	int *p, i, h, offs;\r
	47	\r
	48	len = (len+3) >> 2;\r
	49	for (h = 0; h < 8; h++) {\r
	50	offs = (x + g_screen_width * (y+h)) & ~3;\r
	51	p = (int ) ((char )g_screen_ptr + offs);\r
	52	for (i = len; i; i--, p++)\r
	53	*p = 0xe0e0e0e0;\r
	54	}\r
	55	emu_text_out8(x, y, text);\r
	56	}\r
b188c2b6	57	*/\r
d2f29611	58	\r
	59	static void osd_text16(int x, int y, const char *text)\r
	60	{\r
	61	int len = strlen(text)*8;\r
	62	int *p, i, h, offs;\r
	63	\r
	64	len = (len+1) >> 1;\r
	65	for (h = 0; h < 8; h++) {\r
	66	offs = (x + g_screen_width * (y+h)) & ~1;\r
	67	p = (int ) ((short )g_screen_ptr + offs);\r
	68	for (i = len; i; i--, p++)\r
	69	p = (p >> 2) & 0x39e7;\r
	70	}\r
	71	emu_text_out16(x, y, text);\r
	72	}\r
	73	\r
	74	static void draw_cd_leds(void)\r
	75	{\r
	76	int led_reg, pitch, scr_offs, led_offs;\r
	77	led_reg = Pico_mcd->s68k_regs[0];\r
	78	\r
	79	pitch = 320;\r
	80	led_offs = 4;\r
	81	scr_offs = pitch * 2 + 4;\r
	82	\r
662e622b	83	if (currentConfig.renderer != RT_16BIT) {\r
d2f29611	84	#define p(x) px[(x) >> 2]\r
	85	// 8-bit modes\r
	86	unsigned int px = (unsigned int )((char *)g_screen_ptr + scr_offs);\r
	87	unsigned int col_g = (led_reg & 2) ? 0xc0c0c0c0 : 0xe0e0e0e0;\r
	88	unsigned int col_r = (led_reg & 1) ? 0xd0d0d0d0 : 0xe0e0e0e0;\r
	89	p(pitch0) = p(pitch1) = p(pitch*2) = col_g;\r
	90	p(pitch0 + led_offs) = p(pitch1 + led_offs) = p(pitch*2 + led_offs) = col_r;\r
	91	#undef p\r
	92	} else {\r
	93	#define p(x) px[(x)2 >> 2] = px[((x)2 >> 2) + 1]\r
	94	// 16-bit modes\r
	95	unsigned int px = (unsigned int )((short *)g_screen_ptr + scr_offs);\r
	96	unsigned int col_g = (led_reg & 2) ? 0x06000600 : 0;\r
	97	unsigned int col_r = (led_reg & 1) ? 0xc000c000 : 0;\r
	98	p(pitch0) = p(pitch1) = p(pitch*2) = col_g;\r
	99	p(pitch0 + led_offs) = p(pitch1 + led_offs) = p(pitch*2 + led_offs) = col_r;\r
	100	#undef p\r
	101	}\r
	102	}\r
	103	\r
b188c2b6	104	void pemu_finalize_frame(const char fps, const char notice)\r
d2f29611	105	{\r
662e622b	106	if (currentConfig.renderer != RT_16BIT && !(PicoAHW & PAHW_32X)) {\r
	107	unsigned short pd = (unsigned short )g_screen_ptr + 8 * g_screen_width;\r
	108	unsigned char ps = PicoDraw2FB + 3288 + 8;\r
	109	unsigned short *pal = HighPal;\r
	110	int i, x;\r
	111	if (Pico.m.dirtyPal)\r
	112	PicoDrawUpdateHighPal();\r
	113	for (i = 0; i < 224; i++, ps += 8)\r
	114	for (x = 0; x < 320; x++)\r
	115	pd++ = pal[ps++];\r
	116	}\r
	117	\r
d2f29611	118	if (notice \|\| (currentConfig.EmuOpt & EOPT_SHOW_FPS)) {\r
	119	if (notice)\r
	120	osd_text(4, g_screen_height - 8, notice);\r
	121	if (currentConfig.EmuOpt & EOPT_SHOW_FPS)\r
b188c2b6	122	osd_text(g_screen_width - 60, g_screen_height - 8, fps);\r
d2f29611	123	}\r
	124	if ((PicoAHW & PAHW_MCD) && (currentConfig.EmuOpt & EOPT_EN_CD_LEDS))\r
	125	draw_cd_leds();\r
d2f29611	126	}\r
d2f29611	127	\r
662e622b	128	static void apply_renderer(void)\r
	129	{\r
	130	PicoScanBegin = NULL;\r
	131	PicoScanEnd = NULL;\r
	132	\r
	133	switch (currentConfig.renderer) {\r
	134	case RT_16BIT:\r
	135	PicoOpt &= ~POPT_ALT_RENDERER;\r
	136	PicoDrawSetOutFormat(PDF_RGB555, 0);\r
	137	PicoDrawSetOutBuf(g_screen_ptr, g_screen_width * 2);\r
	138	break;\r
	139	case RT_8BIT_ACC:\r
	140	PicoOpt &= ~POPT_ALT_RENDERER;\r
	141	PicoDrawSetOutFormat(PDF_8BIT, 0);\r
	142	PicoDrawSetOutBuf(PicoDraw2FB + 8, 328);\r
	143	break;\r
	144	case RT_8BIT_FAST:\r
	145	PicoOpt \|= POPT_ALT_RENDERER;\r
	146	PicoDrawSetOutFormat(PDF_NONE, 0);\r
	147	break;\r
	148	}\r
	149	\r
	150	if (PicoAHW & PAHW_32X) {\r
	151	int only_32x = 0;\r
	152	if (currentConfig.renderer == RT_16BIT)\r
	153	only_32x = 1;\r
	154	else\r
	155	PicoDrawSetOutFormat(PDF_NONE, 0);\r
	156	PicoDraw32xSetFrameMode(1, only_32x);\r
	157	PicoDrawSetOutBuf(g_screen_ptr, g_screen_width * 2);\r
	158	}\r
	159	}\r
	160	\r
	161	void plat_video_toggle_renderer(int change, int is_menu)\r
d2f29611	162	{\r
662e622b	163	currentConfig.renderer += change;\r
	164	if (currentConfig.renderer >= RT_COUNT)\r
	165	currentConfig.renderer = 0;\r
	166	else if (currentConfig.renderer < 0)\r
	167	currentConfig.renderer = RT_COUNT - 1;\r
	168	\r
	169	if (!is_menu)\r
	170	apply_renderer();\r
	171	\r
	172	emu_status_msg(renderer_names[currentConfig.renderer]);\r
d2f29611	173	}\r
	174	\r
	175	void plat_video_menu_enter(int is_rom_loaded)\r
	176	{\r
	177	}\r
	178	\r
	179	void plat_video_menu_begin(void)\r
	180	{\r
	181	memcpy32(g_screen_ptr, g_menubg_ptr, g_screen_width * g_screen_height * 2 / 4);\r
	182	}\r
	183	\r
	184	void plat_video_menu_end(void)\r
	185	{\r
b188c2b6	186	plat_video_flip();\r
d2f29611	187	}\r
	188	\r
	189	void plat_status_msg_clear(void)\r
	190	{\r
	191	unsigned short d = (unsigned short )g_screen_ptr + g_screen_width * g_screen_height;\r
	192	int l = g_screen_width * 8;\r
	193	memset32((int )(d - l), 0, l 2 / 4);\r
	194	}\r
	195	\r
	196	void plat_status_msg_busy_next(const char *msg)\r
	197	{\r
	198	plat_status_msg_clear();\r
b188c2b6	199	pemu_finalize_frame("", msg);\r
b188c2b6	200	plat_video_flip();\r
d2f29611	201	emu_status_msg("");\r
	202	reset_timing = 1;\r
	203	}\r
	204	\r
	205	void plat_status_msg_busy_first(const char *msg)\r
	206	{\r
	207	// memset32(g_screen_ptr, 0, g_screen_width * g_screen_height * 2 / 4);\r
	208	plat_status_msg_busy_next(msg);\r
	209	}\r
	210	\r
	211	void plat_update_volume(int has_changed, int is_up)\r
	212	{\r
	213	}\r
	214	\r
	215	void pemu_forced_frame(int opts)\r
	216	{\r
	217	int po_old = PicoOpt;\r
	218	int eo_old = currentConfig.EmuOpt;\r
	219	\r
	220	PicoOpt &= ~POPT_ALT_RENDERER;\r
	221	PicoOpt \|= opts\|POPT_ACC_SPRITES; // acc_sprites\r
d2f29611	222	\r
662e622b	223	PicoDrawSetOutFormat(PDF_RGB555, 0);\r
d2f29611	224	\r
	225	Pico.m.dirtyPal = 1;\r
	226	PicoFrameDrawOnly();\r
	227	\r
	228	PicoOpt = po_old;\r
	229	currentConfig.EmuOpt = eo_old;\r
	230	}\r
	231	\r
	232	static void updateSound(int len)\r
	233	{\r
	234	len <<= 1;\r
	235	if (PicoOpt & POPT_EN_STEREO)\r
	236	len <<= 1;\r
	237	\r
	238	if ((currentConfig.EmuOpt & EOPT_NO_FRMLIMIT) && !sndout_oss_can_write(len))\r
	239	return;\r
	240	\r
	241	/* avoid writing audio when lagging behind to prevent audio lag */\r
	242	if (PicoSkipFrame != 2)\r
	243	sndout_oss_write(PsndOut, len);\r
	244	}\r
	245	\r
	246	void pemu_sound_start(void)\r
	247	{\r
d2f29611	248	int target_fps = Pico.m.pal ? 50 : 60;\r
	249	\r
	250	PsndOut = NULL;\r
	251	\r
	252	if (currentConfig.EmuOpt & EOPT_EN_SOUND)\r
	253	{\r
b188c2b6	254	int snd_excess_add, frame_samples;\r
	255	int is_stereo = (PicoOpt & POPT_EN_STEREO) ? 1 : 0;\r
	256	\r
	257	PsndRerate(Pico.m.frame_count ? 1 : 0);\r
	258	\r
	259	frame_samples = PsndLen;\r
	260	snd_excess_add = ((PsndRate - PsndLen * target_fps)<<16) / target_fps;\r
	261	if (snd_excess_add != 0)\r
	262	frame_samples++;\r
d2f29611	263	\r
d2f29611	264	printf("starting audio: %i len: %i (ex: %04x) stereo: %i, pal: %i\n",\r
b188c2b6	265	PsndRate, PsndLen, snd_excess_add, is_stereo, Pico.m.pal);\r
b188c2b6	266	sndout_oss_start(PsndRate, frame_samples, is_stereo);\r
d2f29611	267	sndout_oss_setvol(currentConfig.volume, currentConfig.volume);\r
	268	PicoWriteSound = updateSound;\r
	269	plat_update_volume(0, 0);\r
	270	memset(sndBuffer, 0, sizeof(sndBuffer));\r
	271	PsndOut = sndBuffer;\r
d2f29611	272	}\r
	273	}\r
	274	\r
	275	void pemu_sound_stop(void)\r
	276	{\r
	277	}\r
	278	\r
	279	void pemu_sound_wait(void)\r
	280	{\r
	281	// don't need to do anything, writes will block by themselves\r
	282	}\r
	283	\r
	284	void plat_debug_cat(char *str)\r
	285	{\r
	286	}\r
	287	\r
	288	void emu_video_mode_change(int start_line, int line_count, int is_32cols)\r
	289	{\r
d2f29611	290	// clear whole screen in all buffers\r
	291	memset32(g_screen_ptr, 0, g_screen_width * g_screen_height * 2 / 4);\r
	292	}\r
	293	\r
	294	void pemu_loop_prep(void)\r
	295	{\r
662e622b	296	apply_renderer();\r
d2f29611	297	osd_text = osd_text16;\r
	298	\r
	299	pemu_sound_start();\r
	300	}\r
	301	\r
	302	void pemu_loop_end(void)\r
	303	{\r
	304	int po_old = PicoOpt;\r
	305	int eo_old = currentConfig.EmuOpt;\r
	306	\r
	307	pemu_sound_stop();\r
	308	memset32(g_screen_ptr, 0, g_screen_width * g_screen_height * 2 / 4);\r
	309	\r
	310	/* do one more frame for menu bg */\r
	311	PicoOpt &= ~POPT_ALT_RENDERER;\r
	312	PicoOpt \|= POPT_EN_SOFTSCALE\|POPT_ACC_SPRITES;\r
d2f29611	313	\r
662e622b	314	PicoDrawSetOutFormat(PDF_RGB555, 0);\r
d2f29611	315	Pico.m.dirtyPal = 1;\r
	316	PicoFrame();\r
	317	\r
	318	PicoOpt = po_old;\r
	319	currentConfig.EmuOpt = eo_old;\r
	320	}\r
	321	\r
	322	void plat_wait_till_us(unsigned int us_to)\r
	323	{\r
	324	unsigned int now;\r
	325	\r
	326	now = plat_get_ticks_us();\r
	327	\r
	328	while ((signed int)(us_to - now) > 512)\r
	329	{\r
	330	usleep(1024);\r
	331	now = plat_get_ticks_us();\r
	332	}\r
	333	}\r
	334	\r
d2f29611	335	const char *plat_get_credits(void)\r
	336	{\r
	337	return "PicoDrive v" VERSION " (c) notaz, 2006-2009\n\n\n"\r
	338	"Credits:\n"\r
	339	"fDave: Cyclone 68000 core,\n"\r
	340	" base code of PicoDrive\n"\r
	341	"Reesy & FluBBa: DrZ80 core\n"\r
	342	"MAME devs: YM2612 and SN76496 cores\n"\r
	343	"rlyeh and others: minimal SDK\n"\r
	344	"Squidge: mmuhack\n"\r
	345	"Dzz: ARM940 sample\n"\r
	346	"GnoStiC / Puck2099: USB joy code\n"\r
	347	"craigix: GP2X hardware\n"\r
	348	"ketchupgun: skin design\n"\r
	349	"\n"\r
	350	"special thanks (for docs, ideas):\n"\r
	351	" Charles MacDonald, Haze,\n"\r
	352	" Stephane Dallongeville,\n"\r
	353	" Lordus, Exophase, Rokas,\n"\r
	354	" Nemesis, Tasco Deluxe";\r
	355	}\r