[libpicofe.git] / gp2x / gp2x.c

/**\r
 * All this is mostly based on rlyeh's minimal library.\r
 * Copied here to review all his code and understand what's going on.\r
**/\r
\r
/*\r
\r
  GP2X minimal library v0.A by rlyeh, (c) 2005. emulnation.info@rlyeh (swap it!)\r
\r
  Thanks to Squidge, Robster, snaff, Reesy and NK, for the help & previous work! :-)\r
\r
  License\r
  =======\r
\r
  Free for non-commercial projects (it would be nice receiving a mail from you).\r
  Other cases, ask me first.\r
\r
  GamePark Holdings is not allowed to use this library and/or use parts from it.\r
\r
*/\r
\r
\r
#include <stdio.h>\r
#include <stdlib.h>\r
#include <string.h>\r
#include <unistd.h>\r
#include <sys/mman.h>\r
#include <sys/types.h>\r
#include <sys/stat.h>\r
#include <sys/ioctl.h>\r
#include <sys/soundcard.h>\r
#include <fcntl.h>\r
#include <errno.h>\r
\r
#include "gp2x.h"\r
#include "usbjoy.h"\r
\r
volatile unsigned short *gp2x_memregs;\r
//static\r
volatile unsigned long  *gp2x_memregl;\r
static void *gp2x_screens[4];\r
static int screensel = 0;\r
//static\r
int memdev = 0;\r
static int sounddev = 0, mixerdev = 0;\r
\r
void *gp2x_screen;\r
\r
#define FRAMEBUFF_WHOLESIZE (0x30000*4) // 320*240*2 + some more\r
#define FRAMEBUFF_ADDR0 (0x4000000-FRAMEBUFF_WHOLESIZE)\r
#define FRAMEBUFF_ADDR1 (FRAMEBUFF_ADDR0+0x30000)\r
#define FRAMEBUFF_ADDR2 (FRAMEBUFF_ADDR1+0x30000)\r
#define FRAMEBUFF_ADDR3 (FRAMEBUFF_ADDR2+0x30000)\r
\r
static const int gp2x_screenaddrs[4] = { FRAMEBUFF_ADDR0, FRAMEBUFF_ADDR1, FRAMEBUFF_ADDR2, FRAMEBUFF_ADDR3 };\r
static int gp2x_screenaddrs_use[4];\r
static unsigned short gp2x_screenaddr_old[4];\r
\r
\r
/* video stuff */\r
void gp2x_video_flip(void)\r
{\r
	unsigned short lsw = (unsigned short) gp2x_screenaddrs_use[screensel&3];\r
	unsigned short msw = (unsigned short)(gp2x_screenaddrs_use[screensel&3] >> 16);\r
\r
  	gp2x_memregs[0x2910>>1] = msw;\r
  	gp2x_memregs[0x2914>>1] = msw;\r
	gp2x_memregs[0x290E>>1] = lsw;\r
  	gp2x_memregs[0x2912>>1] = lsw;\r
\r
	// jump to other buffer:\r
	gp2x_screen = gp2x_screens[++screensel&3];\r
}\r
\r
/* doulblebuffered flip */\r
void gp2x_video_flip2(void)\r
{\r
	unsigned short msw = (unsigned short)(gp2x_screenaddrs_use[screensel&1] >> 16);\r
\r
  	gp2x_memregs[0x2910>>1] = msw;\r
  	gp2x_memregs[0x2914>>1] = msw;\r
	gp2x_memregs[0x290E>>1] = 0;\r
  	gp2x_memregs[0x2912>>1] = 0;\r
\r
	// jump to other buffer:\r
	gp2x_screen = gp2x_screens[++screensel&1];\r
}\r
\r
\r
void gp2x_video_changemode2(int bpp)\r
{\r
  	gp2x_memregs[0x28DA>>1]=(((bpp+1)/8)<<9)|0xAB; /*8/15/16/24bpp...*/\r
  	gp2x_memregs[0x290C>>1]=320*((bpp+1)/8); /*line width in bytes*/\r
}\r
\r
\r
void gp2x_video_changemode(int bpp)\r
{\r
	gp2x_video_changemode2(bpp);\r
\r
  	gp2x_memset_all_buffers(0, 0, 320*240*2);\r
	gp2x_video_flip();\r
}\r
\r
\r
void gp2x_video_setpalette(int *pal, int len)\r
{\r
	unsigned short *g=(unsigned short *)pal;\r
	volatile unsigned short *memreg = &gp2x_memregs[0x295A>>1];\r
	gp2x_memregs[0x2958>>1] = 0;\r
\r
	len *= 2;\r
	while(len--) *memreg=*g++;\r
}\r
\r
\r
// TV Compatible function //\r
void gp2x_video_RGB_setscaling(int ln_offs, int W, int H)\r
{\r
	float escalaw, escalah;\r
	int bpp = (gp2x_memregs[0x28DA>>1]>>9)&0x3;\r
	unsigned short scalw;\r
\r
	// set offset\r
	gp2x_screenaddrs_use[0] = gp2x_screenaddrs[0] + ln_offs * 320 * bpp;\r
	gp2x_screenaddrs_use[1] = gp2x_screenaddrs[1] + ln_offs * 320 * bpp;\r
	gp2x_screenaddrs_use[2] = gp2x_screenaddrs[2] + ln_offs * 320 * bpp;\r
	gp2x_screenaddrs_use[3] = gp2x_screenaddrs[3] + ln_offs * 320 * bpp;\r
\r
	escalaw = 1024.0; // RGB Horiz LCD\r
	escalah = 320.0; // RGB Vert LCD\r
\r
	if(gp2x_memregs[0x2800>>1]&0x100) //TV-Out\r
	{\r
		escalaw=489.0; // RGB Horiz TV (PAL, NTSC)\r
		if (gp2x_memregs[0x2818>>1]  == 287) //PAL\r
			escalah=274.0; // RGB Vert TV PAL\r
		else if (gp2x_memregs[0x2818>>1]  == 239) //NTSC\r
			escalah=331.0; // RGB Vert TV NTSC\r
	}\r
\r
	// scale horizontal\r
	scalw = (unsigned short)((float)escalaw *(W/320.0));\r
	/* if there is no horizontal scaling, vertical doesn't work. Here is a nasty wrokaround... */\r
	if (H != 240 && W == 320) scalw--;\r
	gp2x_memregs[0x2906>>1]=scalw;\r
	// scale vertical\r
	gp2x_memregl[0x2908>>2]=(unsigned long)((float)escalah *bpp *(H/240.0));\r
}\r
\r
\r
/* LCD updates @ 80Hz? */\r
void gp2x_video_wait_vsync(void)\r
{\r
	gp2x_memregs[0x2846>>1] = 0x20|2; //(gp2x_memregs[0x2846>>1] | 0x20) & ~2;\r
	while(!(gp2x_memregs[0x2846>>1] & 2));// usleep(1);\r
}\r
\r
\r
void gp2x_memcpy_buffers(int buffers, void *data, int offset, int len)\r
{\r
	if (buffers & (1<<0)) memcpy((char *)gp2x_screens[0] + offset, data, len);\r
	if (buffers & (1<<1)) memcpy((char *)gp2x_screens[1] + offset, data, len);\r
	if (buffers & (1<<2)) memcpy((char *)gp2x_screens[2] + offset, data, len);\r
	if (buffers & (1<<3)) memcpy((char *)gp2x_screens[3] + offset, data, len);\r
}\r
\r
\r
void gp2x_memcpy_all_buffers(void *data, int offset, int len)\r
{\r
	gp2x_memcpy_buffers(0xf, data, offset, len);\r
}\r
\r
\r
void gp2x_memset_all_buffers(int offset, int byte, int len)\r
{\r
	memset((char *)gp2x_screens[0] + offset, byte, len);\r
	memset((char *)gp2x_screens[1] + offset, byte, len);\r
	memset((char *)gp2x_screens[2] + offset, byte, len);\r
	memset((char *)gp2x_screens[3] + offset, byte, len);\r
}\r
\r
\r
void gp2x_pd_clone_buffer2(void)\r
{\r
	memcpy(gp2x_screen, gp2x_screens[2], 320*240);\r
	memset(gp2x_screen, 0xe0, 320*8);\r
	memset(gp2x_screen + 320*232, 0xe0, 320*8);\r
}\r
\r
\r
unsigned long gp2x_joystick_read(int allow_usb_joy)\r
{\r
	int i;\r
  	unsigned long value=(gp2x_memregs[0x1198>>1] & 0x00FF);\r
  	if(value==0xFD) value=0xFA;\r
  	if(value==0xF7) value=0xEB;\r
  	if(value==0xDF) value=0xAF;\r
  	if(value==0x7F) value=0xBE;\r
  	value = ~((gp2x_memregs[0x1184>>1] & 0xFF00) | value | (gp2x_memregs[0x1186>>1] << 16));\r
\r
	if (allow_usb_joy && num_of_joys > 0) {\r
		// check the usb joy as well..\r
		gp2x_usbjoy_update();\r
		for (i = 0; i < num_of_joys; i++)\r
			value |= gp2x_usbjoy_check(i);\r
	}\r
\r
	return value;\r
}\r
\r
static int s_oldrate = 0, s_oldbits = 0, s_oldstereo = 0;\r
\r
void gp2x_start_sound(int rate, int bits, int stereo)\r
{\r
	int frag = 0, bsize, buffers;\r
\r
	// if no settings change, we don't need to do anything\r
	if (rate == s_oldrate && s_oldbits == bits && s_oldstereo == stereo) return;\r
\r
	if (sounddev > 0) close(sounddev);\r
	sounddev = open("/dev/dsp", O_WRONLY|O_ASYNC);\r
	if (sounddev == -1)\r
		printf("open(\"/dev/dsp\") failed with %i\n", errno);\r
\r
	ioctl(sounddev, SNDCTL_DSP_SPEED,  &rate);\r
	ioctl(sounddev, SNDCTL_DSP_SETFMT, &bits);\r
	ioctl(sounddev, SNDCTL_DSP_STEREO, &stereo);\r
	// calculate buffer size\r
	buffers = 16;\r
	bsize = rate / 32;\r
	if (rate > 22050) { bsize*=4; buffers*=2; } // 44k mode seems to be very demanding\r
	while ((bsize>>=1)) frag++;\r
	frag |= buffers<<16; // 16 buffers\r
	ioctl(sounddev, SNDCTL_DSP_SETFRAGMENT, &frag);\r
	printf("gp2x_set_sound: %i/%ibit/%s, %i buffers of %i bytes\n",\r
		rate, bits, stereo?"stereo":"mono", frag>>16, 1<<(frag&0xffff));\r
\r
	s_oldrate = rate; s_oldbits = bits; s_oldstereo = stereo;\r
	usleep(100000);\r
}\r
\r
\r
void gp2x_sound_write(void *buff, int len)\r
{\r
	write(sounddev, buff, len);\r
}\r
\r
void gp2x_sound_sync(void)\r
{\r
	ioctl(sounddev, SOUND_PCM_SYNC, 0);\r
}\r
\r
void gp2x_sound_volume(int l, int r)\r
{\r
 	l=l<0?0:l; l=l>255?255:l; r=r<0?0:r; r=r>255?255:r;\r
 	l<<=8; l|=r;\r
 	ioctl(mixerdev, SOUND_MIXER_WRITE_PCM, &l); /*SOUND_MIXER_WRITE_VOLUME*/\r
}\r
\r
\r
/* 940 */\r
void Pause940(int yes)\r
{\r
	if(yes)\r
		gp2x_memregs[0x0904>>1] &= 0xFFFE;\r
	else\r
		gp2x_memregs[0x0904>>1] |= 1;\r
}\r
\r
\r
void Reset940(int yes, int bank)\r
{\r
	gp2x_memregs[0x3B48>>1] = ((yes&1) << 7) | (bank & 0x03);\r
}\r
\r
\r
\r
/* common */\r
void gp2x_init(void)\r
{\r
	printf("entering init()\n"); fflush(stdout);\r
\r
  	memdev = open("/dev/mem", O_RDWR);\r
	if (memdev == -1)\r
	{\r
		printf("open(\"/dev/mem\") failed with %i\n", errno);\r
		exit(1);\r
	}\r
\r
	gp2x_memregs = mmap(0, 0x10000, PROT_READ|PROT_WRITE, MAP_SHARED, memdev, 0xc0000000);\r
	printf("memregs are @ %p\n", gp2x_memregs);\r
	if(gp2x_memregs == MAP_FAILED)\r
	{\r
		printf("mmap(memregs) failed with %i\n", errno);\r
		exit(1);\r
	}\r
	gp2x_memregl = (unsigned long *) gp2x_memregs;\r
\r
  	gp2x_screens[0] = mmap(0, FRAMEBUFF_WHOLESIZE, PROT_WRITE, MAP_SHARED, memdev, FRAMEBUFF_ADDR0);\r
	if(gp2x_screens[0] == MAP_FAILED)\r
	{\r
		printf("mmap(gp2x_screen) failed with %i\n", errno);\r
		exit(1);\r
	}\r
	printf("framebuffers point to %p\n", gp2x_screens[0]);\r
	gp2x_screens[1] = (char *) gp2x_screens[0]+0x30000;\r
	gp2x_screens[2] = (char *) gp2x_screens[1]+0x30000;\r
	gp2x_screens[3] = (char *) gp2x_screens[2]+0x30000;\r
\r
	gp2x_screen = gp2x_screens[0];\r
	screensel = 0;\r
\r
	gp2x_screenaddr_old[0] = gp2x_memregs[0x290E>>1];\r
	gp2x_screenaddr_old[1] = gp2x_memregs[0x2910>>1];\r
	gp2x_screenaddr_old[2] = gp2x_memregs[0x2912>>1];\r
	gp2x_screenaddr_old[3] = gp2x_memregs[0x2914>>1];\r
\r
	memcpy(gp2x_screenaddrs_use, gp2x_screenaddrs, sizeof(gp2x_screenaddrs));\r
	gp2x_memset_all_buffers(0, 0, 320*240*2);\r
\r
	// snd\r
  	mixerdev = open("/dev/mixer", O_RDWR);\r
	if (mixerdev == -1)\r
		printf("open(\"/dev/mixer\") failed with %i\n", errno);\r
\r
	/* init usb joys -GnoStiC */\r
	gp2x_usbjoy_init();\r
\r
	printf("exitting init()\n"); fflush(stdout);\r
}\r
\r
char *ext_menu = 0, *ext_state = 0;\r
\r
void gp2x_deinit(void)\r
{\r
	Reset940(1, 3);\r
	Pause940(1);\r
\r
	gp2x_video_changemode(15);\r
	gp2x_memregs[0x290E>>1] = gp2x_screenaddr_old[0];\r
	gp2x_memregs[0x2910>>1] = gp2x_screenaddr_old[1];\r
	gp2x_memregs[0x2912>>1] = gp2x_screenaddr_old[2];\r
	gp2x_memregs[0x2914>>1] = gp2x_screenaddr_old[3];\r
\r
	munmap(gp2x_screens[0], FRAMEBUFF_WHOLESIZE);\r
	munmap((void *)gp2x_memregs, 0x10000);\r
	close(memdev);\r
	close(mixerdev);\r
	if (sounddev > 0) close(sounddev);\r
\r
	gp2x_usbjoy_deinit();\r
\r
	printf("all done, running ");\r
\r
	// Zaq121's alternative frontend support from MAME\r
	if(ext_menu && ext_state) {\r
		printf("%s -state %s\n", ext_menu, ext_state);\r
		execl(ext_menu, ext_menu, "-state", ext_state, NULL);\r
	} else if(ext_menu) {\r
		printf("%s\n", ext_menu);\r
		execl(ext_menu, ext_menu, NULL);\r
	} else {\r
		printf("gp2xmenu\n");\r
		chdir("/usr/gp2x");\r
		execl("gp2xmenu", "gp2xmenu", NULL);\r
	}\r
}\r
\r
\r
Commit	Line	Data
	1	/**\r
	2	* All this is mostly based on rlyeh's minimal library.\r
	3	* Copied here to review all his code and understand what's going on.\r
	4	**/\r
	5	\r
	6	/*\r
	7	\r
	8	GP2X minimal library v0.A by rlyeh, (c) 2005. emulnation.info@rlyeh (swap it!)\r
	9	\r
	10	Thanks to Squidge, Robster, snaff, Reesy and NK, for the help & previous work! :-)\r
	11	\r
	12	License\r
	13	=======\r
	14	\r
	15	Free for non-commercial projects (it would be nice receiving a mail from you).\r
	16	Other cases, ask me first.\r
	17	\r
	18	GamePark Holdings is not allowed to use this library and/or use parts from it.\r
	19	\r
	20	*/\r
	21	\r
	22	\r
	23	#include <stdio.h>\r
	24	#include <stdlib.h>\r
	25	#include <string.h>\r
	26	#include <unistd.h>\r
	27	#include <sys/mman.h>\r
	28	#include <sys/types.h>\r
	29	#include <sys/stat.h>\r
	30	#include <sys/ioctl.h>\r
	31	#include <sys/soundcard.h>\r
	32	#include <fcntl.h>\r
	33	#include <errno.h>\r
	34	\r
	35	#include "gp2x.h"\r
	36	#include "usbjoy.h"\r
	37	\r
	38	volatile unsigned short *gp2x_memregs;\r
	39	//static\r
	40	volatile unsigned long *gp2x_memregl;\r
	41	static void *gp2x_screens[4];\r
	42	static int screensel = 0;\r
	43	//static\r
	44	int memdev = 0;\r
	45	static int sounddev = 0, mixerdev = 0;\r
	46	\r
	47	void *gp2x_screen;\r
	48	\r
	49	#define FRAMEBUFF_WHOLESIZE (0x300004) // 320240*2 + some more\r
	50	#define FRAMEBUFF_ADDR0 (0x4000000-FRAMEBUFF_WHOLESIZE)\r
	51	#define FRAMEBUFF_ADDR1 (FRAMEBUFF_ADDR0+0x30000)\r
	52	#define FRAMEBUFF_ADDR2 (FRAMEBUFF_ADDR1+0x30000)\r
	53	#define FRAMEBUFF_ADDR3 (FRAMEBUFF_ADDR2+0x30000)\r
	54	\r
	55	static const int gp2x_screenaddrs[4] = { FRAMEBUFF_ADDR0, FRAMEBUFF_ADDR1, FRAMEBUFF_ADDR2, FRAMEBUFF_ADDR3 };\r
	56	static int gp2x_screenaddrs_use[4];\r
	57	static unsigned short gp2x_screenaddr_old[4];\r
	58	\r
	59	\r
	60	/* video stuff */\r
	61	void gp2x_video_flip(void)\r
	62	{\r
	63	unsigned short lsw = (unsigned short) gp2x_screenaddrs_use[screensel&3];\r
	64	unsigned short msw = (unsigned short)(gp2x_screenaddrs_use[screensel&3] >> 16);\r
	65	\r
	66	gp2x_memregs[0x2910>>1] = msw;\r
	67	gp2x_memregs[0x2914>>1] = msw;\r
	68	gp2x_memregs[0x290E>>1] = lsw;\r
	69	gp2x_memregs[0x2912>>1] = lsw;\r
	70	\r
	71	// jump to other buffer:\r
	72	gp2x_screen = gp2x_screens[++screensel&3];\r
	73	}\r
	74	\r
	75	/* doulblebuffered flip */\r
	76	void gp2x_video_flip2(void)\r
	77	{\r
	78	unsigned short msw = (unsigned short)(gp2x_screenaddrs_use[screensel&1] >> 16);\r
	79	\r
	80	gp2x_memregs[0x2910>>1] = msw;\r
	81	gp2x_memregs[0x2914>>1] = msw;\r
	82	gp2x_memregs[0x290E>>1] = 0;\r
	83	gp2x_memregs[0x2912>>1] = 0;\r
	84	\r
	85	// jump to other buffer:\r
	86	gp2x_screen = gp2x_screens[++screensel&1];\r
	87	}\r
	88	\r
	89	\r
	90	void gp2x_video_changemode2(int bpp)\r
	91	{\r
	92	gp2x_memregs[0x28DA>>1]=(((bpp+1)/8)<<9)\|0xAB; /8/15/16/24bpp.../\r
	93	gp2x_memregs[0x290C>>1]=320((bpp+1)/8); /line width in bytes*/\r
	94	}\r
	95	\r
	96	\r
	97	void gp2x_video_changemode(int bpp)\r
	98	{\r
	99	gp2x_video_changemode2(bpp);\r
	100	\r
	101	gp2x_memset_all_buffers(0, 0, 3202402);\r
	102	gp2x_video_flip();\r
	103	}\r
	104	\r
	105	\r
	106	void gp2x_video_setpalette(int *pal, int len)\r
	107	{\r
	108	unsigned short g=(unsigned short )pal;\r
	109	volatile unsigned short *memreg = &gp2x_memregs[0x295A>>1];\r
	110	gp2x_memregs[0x2958>>1] = 0;\r
	111	\r
	112	len *= 2;\r
	113	while(len--) memreg=g++;\r
	114	}\r
	115	\r
	116	\r
	117	// TV Compatible function //\r
	118	void gp2x_video_RGB_setscaling(int ln_offs, int W, int H)\r
	119	{\r
	120	float escalaw, escalah;\r
	121	int bpp = (gp2x_memregs[0x28DA>>1]>>9)&0x3;\r
	122	unsigned short scalw;\r
	123	\r
	124	// set offset\r
	125	gp2x_screenaddrs_use[0] = gp2x_screenaddrs[0] + ln_offs * 320 * bpp;\r
	126	gp2x_screenaddrs_use[1] = gp2x_screenaddrs[1] + ln_offs * 320 * bpp;\r
	127	gp2x_screenaddrs_use[2] = gp2x_screenaddrs[2] + ln_offs * 320 * bpp;\r
	128	gp2x_screenaddrs_use[3] = gp2x_screenaddrs[3] + ln_offs * 320 * bpp;\r
	129	\r
	130	escalaw = 1024.0; // RGB Horiz LCD\r
	131	escalah = 320.0; // RGB Vert LCD\r
	132	\r
	133	if(gp2x_memregs[0x2800>>1]&0x100) //TV-Out\r
	134	{\r
	135	escalaw=489.0; // RGB Horiz TV (PAL, NTSC)\r
	136	if (gp2x_memregs[0x2818>>1] == 287) //PAL\r
	137	escalah=274.0; // RGB Vert TV PAL\r
	138	else if (gp2x_memregs[0x2818>>1] == 239) //NTSC\r
	139	escalah=331.0; // RGB Vert TV NTSC\r
	140	}\r
	141	\r
	142	// scale horizontal\r
	143	scalw = (unsigned short)((float)escalaw *(W/320.0));\r
	144	/* if there is no horizontal scaling, vertical doesn't work. Here is a nasty wrokaround... */\r
	145	if (H != 240 && W == 320) scalw--;\r
	146	gp2x_memregs[0x2906>>1]=scalw;\r
	147	// scale vertical\r
	148	gp2x_memregl[0x2908>>2]=(unsigned long)((float)escalah bpp (H/240.0));\r
	149	}\r
	150	\r
	151	\r
	152	/* LCD updates @ 80Hz? */\r
	153	void gp2x_video_wait_vsync(void)\r
	154	{\r
	155	gp2x_memregs[0x2846>>1] = 0x20\|2; //(gp2x_memregs[0x2846>>1] \| 0x20) & ~2;\r
	156	while(!(gp2x_memregs[0x2846>>1] & 2));// usleep(1);\r
	157	}\r
	158	\r
	159	\r
	160	void gp2x_memcpy_buffers(int buffers, void *data, int offset, int len)\r
	161	{\r
	162	if (buffers & (1<<0)) memcpy((char *)gp2x_screens[0] + offset, data, len);\r
	163	if (buffers & (1<<1)) memcpy((char *)gp2x_screens[1] + offset, data, len);\r
	164	if (buffers & (1<<2)) memcpy((char *)gp2x_screens[2] + offset, data, len);\r
	165	if (buffers & (1<<3)) memcpy((char *)gp2x_screens[3] + offset, data, len);\r
	166	}\r
	167	\r
	168	\r
	169	void gp2x_memcpy_all_buffers(void *data, int offset, int len)\r
	170	{\r
	171	gp2x_memcpy_buffers(0xf, data, offset, len);\r
	172	}\r
	173	\r
	174	\r
	175	void gp2x_memset_all_buffers(int offset, int byte, int len)\r
	176	{\r
	177	memset((char *)gp2x_screens[0] + offset, byte, len);\r
	178	memset((char *)gp2x_screens[1] + offset, byte, len);\r
	179	memset((char *)gp2x_screens[2] + offset, byte, len);\r
	180	memset((char *)gp2x_screens[3] + offset, byte, len);\r
	181	}\r
	182	\r
	183	\r
	184	void gp2x_pd_clone_buffer2(void)\r
	185	{\r
	186	memcpy(gp2x_screen, gp2x_screens[2], 320*240);\r
	187	memset(gp2x_screen, 0xe0, 320*8);\r
	188	memset(gp2x_screen + 320232, 0xe0, 3208);\r
	189	}\r
	190	\r
	191	\r
	192	unsigned long gp2x_joystick_read(int allow_usb_joy)\r
	193	{\r
	194	int i;\r
	195	unsigned long value=(gp2x_memregs[0x1198>>1] & 0x00FF);\r
	196	if(value==0xFD) value=0xFA;\r
	197	if(value==0xF7) value=0xEB;\r
	198	if(value==0xDF) value=0xAF;\r
	199	if(value==0x7F) value=0xBE;\r
	200	value = ~((gp2x_memregs[0x1184>>1] & 0xFF00) \| value \| (gp2x_memregs[0x1186>>1] << 16));\r
	201	\r
	202	if (allow_usb_joy && num_of_joys > 0) {\r
	203	// check the usb joy as well..\r
	204	gp2x_usbjoy_update();\r
	205	for (i = 0; i < num_of_joys; i++)\r
	206	value \|= gp2x_usbjoy_check(i);\r
	207	}\r
	208	\r
	209	return value;\r
	210	}\r
	211	\r
	212	static int s_oldrate = 0, s_oldbits = 0, s_oldstereo = 0;\r
	213	\r
	214	void gp2x_start_sound(int rate, int bits, int stereo)\r
	215	{\r
	216	int frag = 0, bsize, buffers;\r
	217	\r
	218	// if no settings change, we don't need to do anything\r
	219	if (rate == s_oldrate && s_oldbits == bits && s_oldstereo == stereo) return;\r
	220	\r
	221	if (sounddev > 0) close(sounddev);\r
	222	sounddev = open("/dev/dsp", O_WRONLY\|O_ASYNC);\r
	223	if (sounddev == -1)\r
	224	printf("open(\"/dev/dsp\") failed with %i\n", errno);\r
	225	\r
	226	ioctl(sounddev, SNDCTL_DSP_SPEED, &rate);\r
	227	ioctl(sounddev, SNDCTL_DSP_SETFMT, &bits);\r
	228	ioctl(sounddev, SNDCTL_DSP_STEREO, &stereo);\r
	229	// calculate buffer size\r
	230	buffers = 16;\r
	231	bsize = rate / 32;\r
	232	if (rate > 22050) { bsize=4; buffers=2; } // 44k mode seems to be very demanding\r
	233	while ((bsize>>=1)) frag++;\r
	234	frag \|= buffers<<16; // 16 buffers\r
	235	ioctl(sounddev, SNDCTL_DSP_SETFRAGMENT, &frag);\r
	236	printf("gp2x_set_sound: %i/%ibit/%s, %i buffers of %i bytes\n",\r
	237	rate, bits, stereo?"stereo":"mono", frag>>16, 1<<(frag&0xffff));\r
	238	\r
	239	s_oldrate = rate; s_oldbits = bits; s_oldstereo = stereo;\r
	240	usleep(100000);\r
	241	}\r
	242	\r
	243	\r
	244	void gp2x_sound_write(void *buff, int len)\r
	245	{\r
	246	write(sounddev, buff, len);\r
	247	}\r
	248	\r
	249	void gp2x_sound_sync(void)\r
	250	{\r
	251	ioctl(sounddev, SOUND_PCM_SYNC, 0);\r
	252	}\r
	253	\r
	254	void gp2x_sound_volume(int l, int r)\r
	255	{\r
	256	l=l<0?0:l; l=l>255?255:l; r=r<0?0:r; r=r>255?255:r;\r
	257	l<<=8; l\|=r;\r
	258	ioctl(mixerdev, SOUND_MIXER_WRITE_PCM, &l); /SOUND_MIXER_WRITE_VOLUME/\r
	259	}\r
	260	\r
	261	\r
	262	/* 940 */\r
	263	void Pause940(int yes)\r
	264	{\r
	265	if(yes)\r
	266	gp2x_memregs[0x0904>>1] &= 0xFFFE;\r
	267	else\r
	268	gp2x_memregs[0x0904>>1] \|= 1;\r
	269	}\r
	270	\r
	271	\r
	272	void Reset940(int yes, int bank)\r
	273	{\r
	274	gp2x_memregs[0x3B48>>1] = ((yes&1) << 7) \| (bank & 0x03);\r
	275	}\r
	276	\r
	277	\r
	278	\r
	279	/* common */\r
	280	void gp2x_init(void)\r
	281	{\r
	282	printf("entering init()\n"); fflush(stdout);\r
	283	\r
	284	memdev = open("/dev/mem", O_RDWR);\r
	285	if (memdev == -1)\r
	286	{\r
	287	printf("open(\"/dev/mem\") failed with %i\n", errno);\r
	288	exit(1);\r
	289	}\r
	290	\r
	291	gp2x_memregs = mmap(0, 0x10000, PROT_READ\|PROT_WRITE, MAP_SHARED, memdev, 0xc0000000);\r
	292	printf("memregs are @ %p\n", gp2x_memregs);\r
	293	if(gp2x_memregs == MAP_FAILED)\r
	294	{\r
	295	printf("mmap(memregs) failed with %i\n", errno);\r
	296	exit(1);\r
	297	}\r
	298	gp2x_memregl = (unsigned long *) gp2x_memregs;\r
	299	\r
	300	gp2x_screens[0] = mmap(0, FRAMEBUFF_WHOLESIZE, PROT_WRITE, MAP_SHARED, memdev, FRAMEBUFF_ADDR0);\r
	301	if(gp2x_screens[0] == MAP_FAILED)\r
	302	{\r
	303	printf("mmap(gp2x_screen) failed with %i\n", errno);\r
	304	exit(1);\r
	305	}\r
	306	printf("framebuffers point to %p\n", gp2x_screens[0]);\r
	307	gp2x_screens[1] = (char *) gp2x_screens[0]+0x30000;\r
	308	gp2x_screens[2] = (char *) gp2x_screens[1]+0x30000;\r
	309	gp2x_screens[3] = (char *) gp2x_screens[2]+0x30000;\r
	310	\r
	311	gp2x_screen = gp2x_screens[0];\r
	312	screensel = 0;\r
	313	\r
	314	gp2x_screenaddr_old[0] = gp2x_memregs[0x290E>>1];\r
	315	gp2x_screenaddr_old[1] = gp2x_memregs[0x2910>>1];\r
	316	gp2x_screenaddr_old[2] = gp2x_memregs[0x2912>>1];\r
	317	gp2x_screenaddr_old[3] = gp2x_memregs[0x2914>>1];\r
	318	\r
	319	memcpy(gp2x_screenaddrs_use, gp2x_screenaddrs, sizeof(gp2x_screenaddrs));\r
	320	gp2x_memset_all_buffers(0, 0, 3202402);\r
	321	\r
	322	// snd\r
	323	mixerdev = open("/dev/mixer", O_RDWR);\r
	324	if (mixerdev == -1)\r
	325	printf("open(\"/dev/mixer\") failed with %i\n", errno);\r
	326	\r
	327	/* init usb joys -GnoStiC */\r
	328	gp2x_usbjoy_init();\r
	329	\r
	330	printf("exitting init()\n"); fflush(stdout);\r
	331	}\r
	332	\r
	333	char ext_menu = 0, ext_state = 0;\r
	334	\r
	335	void gp2x_deinit(void)\r
	336	{\r
	337	Reset940(1, 3);\r
	338	Pause940(1);\r
	339	\r
	340	gp2x_video_changemode(15);\r
	341	gp2x_memregs[0x290E>>1] = gp2x_screenaddr_old[0];\r
	342	gp2x_memregs[0x2910>>1] = gp2x_screenaddr_old[1];\r
	343	gp2x_memregs[0x2912>>1] = gp2x_screenaddr_old[2];\r
	344	gp2x_memregs[0x2914>>1] = gp2x_screenaddr_old[3];\r
	345	\r
	346	munmap(gp2x_screens[0], FRAMEBUFF_WHOLESIZE);\r
	347	munmap((void *)gp2x_memregs, 0x10000);\r
	348	close(memdev);\r
	349	close(mixerdev);\r
	350	if (sounddev > 0) close(sounddev);\r
	351	\r
	352	gp2x_usbjoy_deinit();\r
	353	\r
	354	printf("all done, running ");\r
	355	\r
	356	// Zaq121's alternative frontend support from MAME\r
	357	if(ext_menu && ext_state) {\r
	358	printf("%s -state %s\n", ext_menu, ext_state);\r
	359	execl(ext_menu, ext_menu, "-state", ext_state, NULL);\r
	360	} else if(ext_menu) {\r
	361	printf("%s\n", ext_menu);\r
	362	execl(ext_menu, ext_menu, NULL);\r
	363	} else {\r
	364	printf("gp2xmenu\n");\r
	365	chdir("/usr/gp2x");\r
	366	execl("gp2xmenu", "gp2xmenu", NULL);\r
	367	}\r
	368	}\r
	369	\r
	370	\r