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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 |
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_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 |
54 | static const int gp2x_screenaddrs[] = { FRAMEBUFF_ADDR0, FRAMEBUFF_ADDR1, FRAMEBUFF_ADDR2, FRAMEBUFF_ADDR3 };\r |
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55 | static unsigned short gp2x_screenaddr_old[4];\r |
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56 | \r |
57 | \r |
58 | /* video stuff */\r |
59 | void gp2x_video_flip(void)\r |
60 | {\r |
61 | unsigned int address = gp2x_screenaddrs[screensel&3];\r |
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62 | unsigned short msb16 = (unsigned short)(address >> 16);\r |
63 | unsigned short lsb16 = (unsigned short)(address);\r |
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64 | \r |
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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 |
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69 | \r |
70 | // jump to other buffer:\r |
71 | gp2x_screen = gp2x_screens[++screensel&3];\r |
72 | }\r |
73 | \r |
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74 | /* doulblebuffered flip */\r |
75 | void 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 |
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80 | \r |
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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 |
91 | void gp2x_video_changemode2(int bpp)\r |
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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 |
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95 | }\r |
96 | \r |
97 | \r |
98 | void gp2x_video_changemode(int bpp)\r |
99 | {\r |
100 | gp2x_video_changemode2(bpp);\r |
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101 | \r |
102 | gp2x_memset_all_buffers(0, 0, 640*480);\r |
103 | gp2x_video_flip();\r |
104 | }\r |
105 | \r |
106 | \r |
107 | void 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 |
119 | void 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 |
144 | void 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 |
151 | void 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 |
160 | void 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 |
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169 | void 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 |
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177 | unsigned 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 |
197 | static int s_oldrate = 0, s_oldbits = 0, s_oldstereo = 0;\r |
198 | \r |
199 | void 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 |
229 | void gp2x_sound_write(void *buff, int len)\r |
230 | {\r |
231 | write(sounddev, buff, len);\r |
232 | }\r |
233 | \r |
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234 | void gp2x_sound_sync(void)\r |
235 | {\r |
236 | ioctl(sounddev, SOUND_PCM_SYNC, 0);\r |
237 | }\r |
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238 | \r |
239 | void 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 |
248 | void 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 |
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257 | void Reset940(int yes, int bank)\r |
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258 | {\r |
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259 | gp2x_memregs[0x3B48>>1] = ((yes&1) << 7) | (bank & 0x03); /* bank=3 */\r |
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260 | }\r |
261 | \r |
262 | \r |
263 | \r |
264 | /* common */\r |
265 | void 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 |
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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 |
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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 |
315 | char *ext_menu = 0, *ext_state = 0;\r |
316 | \r |
317 | void gp2x_deinit(void)\r |
318 | {\r |
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319 | Reset940(1, 3);\r |
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320 | Pause940(1);\r |
321 | \r |
322 | gp2x_video_changemode(15);\r |
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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 |
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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 |