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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
38volatile unsigned short *gp2x_memregs;\r
39//static\r
40volatile unsigned long *gp2x_memregl;\r
41static void *gp2x_screens[4];\r
42static int screensel = 0;\r
43//static\r
44int memdev = 0;\r
45static int sounddev = 0, mixerdev = 0;\r
46\r
47void *gp2x_screen;\r
48\r
49#define FRAMEBUFF_ADDR0 0x4000000-640*480\r
50#define FRAMEBUFF_ADDR1 0x4000000-640*480*2\r
51#define FRAMEBUFF_ADDR2 0x4000000-640*480*3\r
52#define FRAMEBUFF_ADDR3 0x4000000-640*480*4\r
53\r
54static const int gp2x_screenaddrs[] = { FRAMEBUFF_ADDR0, FRAMEBUFF_ADDR1, FRAMEBUFF_ADDR2, FRAMEBUFF_ADDR3 };\r
55static unsigned short gp2x_screenaddr_old[4];\r
56\r
57\r
58/* video stuff */\r
59void gp2x_video_flip(void)\r
60{\r
61 unsigned int address = gp2x_screenaddrs[screensel&3];\r
62 unsigned short msb16 = (unsigned short)(address >> 16);\r
63 unsigned short lsb16 = (unsigned short)(address);\r
64\r
65 gp2x_memregs[0x290E>>1] = lsb16;\r
66 gp2x_memregs[0x2910>>1] = msb16;\r
67 gp2x_memregs[0x2912>>1] = lsb16;\r
68 gp2x_memregs[0x2914>>1] = msb16;\r
69\r
70 // jump to other buffer:\r
71 gp2x_screen = gp2x_screens[++screensel&3];\r
72}\r
73\r
74/* doulblebuffered flip */\r
75void gp2x_video_flip2(void)\r
76{\r
77 unsigned int address = gp2x_screenaddrs[screensel&1];\r
78 unsigned short msb16 = (unsigned short)(address >> 16);\r
79 unsigned short lsb16 = (unsigned short)(address);\r
80\r
81 gp2x_memregs[0x290E>>1] = lsb16;\r
82 gp2x_memregs[0x2910>>1] = msb16;\r
83 gp2x_memregs[0x2912>>1] = lsb16;\r
84 gp2x_memregs[0x2914>>1] = msb16;\r
85\r
86 // jump to other buffer:\r
87 gp2x_screen = gp2x_screens[++screensel&1];\r
88}\r
89\r
90\r
91void gp2x_video_changemode2(int bpp)\r
92{\r
93 gp2x_memregs[0x28DA>>1]=(((bpp+1)/8)<<9)|0xAB; /*8/15/16/24bpp...*/\r
94 gp2x_memregs[0x290C>>1]=320*((bpp+1)/8); /*line width in bytes*/\r
95}\r
96\r
97\r
98void gp2x_video_changemode(int bpp)\r
99{\r
100 gp2x_video_changemode2(bpp);\r
101\r
102 gp2x_memset_all_buffers(0, 0, 640*480);\r
103 gp2x_video_flip();\r
104}\r
105\r
106\r
107void gp2x_video_setpalette(int *pal, int len)\r
108{\r
109 unsigned short *g=(unsigned short *)pal;\r
110 volatile unsigned short *memreg = &gp2x_memregs[0x295A>>1];\r
111 gp2x_memregs[0x2958>>1] = 0;\r
112\r
113 len *= 2;\r
114 while(len--) *memreg=*g++;\r
115}\r
116\r
117\r
118// TV Compatible function //\r
119void gp2x_video_RGB_setscaling(int W, int H)\r
120{\r
121 float escalaw, escalah;\r
122 int bpp = (gp2x_memregs[0x28DA>>1]>>9)&0x3;\r
123\r
124 escalaw = 1024.0; // RGB Horiz LCD\r
125 escalah = 320.0; // RGB Vert LCD\r
126\r
127 if(gp2x_memregs[0x2800>>1]&0x100) //TV-Out\r
128 {\r
129 escalaw=489.0; // RGB Horiz TV (PAL, NTSC)\r
130 if (gp2x_memregs[0x2818>>1] == 287) //PAL\r
131 escalah=274.0; // RGB Vert TV PAL\r
132 else if (gp2x_memregs[0x2818>>1] == 239) //NTSC\r
133 escalah=331.0; // RGB Vert TV NTSC\r
134 }\r
135\r
136 // scale horizontal\r
137 gp2x_memregs[0x2906>>1]=(unsigned short)((float)escalaw *(W/320.0));\r
138 // scale vertical\r
139 gp2x_memregl[0x2908>>2]=(unsigned long)((float)escalah *bpp *(H/240.0));\r
140}\r
141\r
142\r
143/* LCD updates @ 80Hz? */\r
144void gp2x_video_wait_vsync(void)\r
145{\r
146 gp2x_memregs[0x2846>>1] = 0x20|2; //(gp2x_memregs[0x2846>>1] | 0x20) & ~2;\r
147 while(!(gp2x_memregs[0x2846>>1] & 2));// usleep(1);\r
148}\r
149\r
150\r
151void gp2x_memcpy_all_buffers(void *data, int offset, int len)\r
152{\r
153 memcpy((char *)gp2x_screens[0] + offset, data, len);\r
154 memcpy((char *)gp2x_screens[1] + offset, data, len);\r
155 memcpy((char *)gp2x_screens[2] + offset, data, len);\r
156 memcpy((char *)gp2x_screens[3] + offset, data, len);\r
157}\r
158\r
159\r
160void gp2x_memset_all_buffers(int offset, int byte, int len)\r
161{\r
162 memset((char *)gp2x_screens[0] + offset, byte, len);\r
163 memset((char *)gp2x_screens[1] + offset, byte, len);\r
164 memset((char *)gp2x_screens[2] + offset, byte, len);\r
165 memset((char *)gp2x_screens[3] + offset, byte, len);\r
166}\r
167\r
168\r
169void gp2x_pd_clone_buffer2(void)\r
170{\r
171 memcpy(gp2x_screen, gp2x_screens[2], 320*240);\r
172 memset(gp2x_screen, 0xe0, 320*8);\r
173 memset(gp2x_screen + 320*232, 0xe0, 320*8);\r
174}\r
175\r
176\r
177unsigned long gp2x_joystick_read(int allow_usb_joy)\r
178{\r
179 int i;\r
180 unsigned long value=(gp2x_memregs[0x1198>>1] & 0x00FF);\r
181 if(value==0xFD) value=0xFA;\r
182 if(value==0xF7) value=0xEB;\r
183 if(value==0xDF) value=0xAF;\r
184 if(value==0x7F) value=0xBE;\r
185 value = ~((gp2x_memregs[0x1184>>1] & 0xFF00) | value | (gp2x_memregs[0x1186>>1] << 16));\r
186\r
187 if (allow_usb_joy && num_of_joys > 0) {\r
188 // check the usb joy as well..\r
189 gp2x_usbjoy_update();\r
190 for (i = 0; i < num_of_joys; i++)\r
191 value |= gp2x_usbjoy_check(i);\r
192 }\r
193\r
194 return value;\r
195}\r
196\r
197static int s_oldrate = 0, s_oldbits = 0, s_oldstereo = 0;\r
198\r
199void gp2x_start_sound(int rate, int bits, int stereo)\r
200{\r
201 int frag = 0, bsize, buffers;\r
202\r
203 // if no settings change, we don't need to do anything\r
204 if (rate == s_oldrate && s_oldbits == bits && s_oldstereo == stereo) return;\r
205\r
206 if (sounddev > 0) close(sounddev);\r
207 sounddev = open("/dev/dsp", O_WRONLY|O_ASYNC);\r
208 if (sounddev == -1)\r
209 printf("open(\"/dev/dsp\") failed with %i\n", errno);\r
210\r
211 ioctl(sounddev, SNDCTL_DSP_SPEED, &rate);\r
212 ioctl(sounddev, SNDCTL_DSP_SETFMT, &bits);\r
213 ioctl(sounddev, SNDCTL_DSP_STEREO, &stereo);\r
214 // calculate buffer size\r
215 buffers = 16;\r
216 bsize = rate / 32;\r
217 if (rate > 22050) { bsize*=4; buffers*=2; } // 44k mode seems to be very demanding\r
218 while ((bsize>>=1)) frag++;\r
219 frag |= buffers<<16; // 16 buffers\r
220 ioctl(sounddev, SNDCTL_DSP_SETFRAGMENT, &frag);\r
221 printf("gp2x_set_sound: %i/%ibit/%s, %i buffers of %i bytes\n",\r
222 rate, bits, stereo?"stereo":"mono", frag>>16, 1<<(frag&0xffff));\r
223\r
224 s_oldrate = rate; s_oldbits = bits; s_oldstereo = stereo;\r
225 usleep(100000);\r
226}\r
227\r
228\r
229void gp2x_sound_write(void *buff, int len)\r
230{\r
231 write(sounddev, buff, len);\r
232}\r
233\r
234void gp2x_sound_sync(void)\r
235{\r
236 ioctl(sounddev, SOUND_PCM_SYNC, 0);\r
237}\r
238\r
239void gp2x_sound_volume(int l, int r)\r
240{\r
241 l=l<0?0:l; l=l>255?255:l; r=r<0?0:r; r=r>255?255:r;\r
242 l<<=8; l|=r;\r
243 ioctl(mixerdev, SOUND_MIXER_WRITE_PCM, &l); /*SOUND_MIXER_WRITE_VOLUME*/\r
244}\r
245\r
246\r
247/* 940 */\r
248void Pause940(int yes)\r
249{\r
250 if(yes)\r
251 gp2x_memregs[0x0904>>1] &= 0xFFFE;\r
252 else\r
253 gp2x_memregs[0x0904>>1] |= 1;\r
254}\r
255\r
256\r
257void Reset940(int yes, int bank)\r
258{\r
259 gp2x_memregs[0x3B48>>1] = ((yes&1) << 7) | (bank & 0x03); /* bank=3 */\r
260}\r
261\r
262\r
263\r
264/* common */\r
265void gp2x_init(void)\r
266{\r
267 printf("entering init()\n"); fflush(stdout);\r
268\r
269 memdev = open("/dev/mem", O_RDWR);\r
270 if (memdev == -1)\r
271 {\r
272 printf("open(\"/dev/mem\") failed with %i\n", errno);\r
273 exit(1);\r
274 }\r
275\r
276 gp2x_memregs = mmap(0, 0x10000, PROT_READ|PROT_WRITE, MAP_SHARED, memdev, 0xc0000000);\r
277 printf("memregs are @ %p\n", gp2x_memregs);\r
278 if(gp2x_memregs == MAP_FAILED)\r
279 {\r
280 printf("mmap(memregs) failed with %i\n", errno);\r
281 exit(1);\r
282 }\r
283 gp2x_memregl = (unsigned long *) gp2x_memregs;\r
284\r
285 gp2x_screens[3] = mmap(0, 640*480*4, PROT_WRITE, MAP_SHARED, memdev, FRAMEBUFF_ADDR3);\r
286 if(gp2x_screens[3] == MAP_FAILED)\r
287 {\r
288 printf("mmap(gp2x_screen) failed with %i\n", errno);\r
289 exit(1);\r
290 }\r
291 printf("framebuffers point to %p\n", gp2x_screens[3]);\r
292 gp2x_screens[2] = (char *) gp2x_screens[3]+640*480;\r
293 gp2x_screens[1] = (char *) gp2x_screens[2]+640*480;\r
294 gp2x_screens[0] = (char *) gp2x_screens[1]+640*480;\r
295\r
296 gp2x_screen = gp2x_screens[0];\r
297 screensel = 0;\r
298\r
299 gp2x_screenaddr_old[0] = gp2x_memregs[0x290E>>1];\r
300 gp2x_screenaddr_old[1] = gp2x_memregs[0x2910>>1];\r
301 gp2x_screenaddr_old[2] = gp2x_memregs[0x2912>>1];\r
302 gp2x_screenaddr_old[3] = gp2x_memregs[0x2914>>1];\r
303\r
304 // snd\r
305 mixerdev = open("/dev/mixer", O_RDWR);\r
306 if (mixerdev == -1)\r
307 printf("open(\"/dev/mixer\") failed with %i\n", errno);\r
308\r
309 /* init usb joys -GnoStiC */\r
310 gp2x_usbjoy_init();\r
311\r
312 printf("exitting init()\n"); fflush(stdout);\r
313}\r
314\r
315char *ext_menu = 0, *ext_state = 0;\r
316\r
317void gp2x_deinit(void)\r
318{\r
319 Reset940(1, 3);\r
320 Pause940(1);\r
321\r
322 gp2x_video_changemode(15);\r
323 gp2x_memregs[0x290E>>1] = gp2x_screenaddr_old[0];\r
324 gp2x_memregs[0x2910>>1] = gp2x_screenaddr_old[1];\r
325 gp2x_memregs[0x2912>>1] = gp2x_screenaddr_old[2];\r
326 gp2x_memregs[0x2914>>1] = gp2x_screenaddr_old[3];\r
327\r
328 munmap(gp2x_screens[0], 640*480*4);\r
329 munmap((void *)gp2x_memregs, 0x10000);\r
330 close(memdev);\r
331 close(mixerdev);\r
332 if (sounddev > 0) close(sounddev);\r
333\r
334 gp2x_usbjoy_deinit();\r
335\r
336 printf("all done, running ");\r
337\r
338 // Zaq121's alternative frontend support from MAME\r
339 if(ext_menu && ext_state) {\r
340 printf("%s -state %s\n", ext_menu, ext_state);\r
341 execl(ext_menu, ext_menu, "-state", ext_state, NULL);\r
342 } else if(ext_menu) {\r
343 printf("%s\n", ext_menu);\r
344 execl(ext_menu, ext_menu, NULL);\r
345 } else {\r
346 printf("gp2xmenu\n");\r
347 chdir("/usr/gp2x");\r
348 execl("gp2xmenu", "gp2xmenu", NULL);\r
349 }\r
350}\r
351\r
352\r
fast MegaDrive/MegaCD/32X emulator