cc68a136 |
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 |
55 | \r |
56 | \r |
57 | /* video stuff */\r |
58 | void gp2x_video_flip(void)\r |
59 | {\r |
60 | unsigned int address = gp2x_screenaddrs[screensel&3];\r |
61 | \r |
62 | /* test */\r |
63 | /* {\r |
64 | int i; char *p=gp2x_screen;\r |
65 | for (i=0; i < 240; i++) { memset(p+i*320, 0, 32); }\r |
66 | }*/\r |
67 | \r |
68 | gp2x_memregs[0x290E>>1]=(unsigned short)(address);\r |
69 | gp2x_memregs[0x2910>>1]=(unsigned short)(address >> 16);\r |
70 | gp2x_memregs[0x2912>>1]=(unsigned short)(address);\r |
71 | gp2x_memregs[0x2914>>1]=(unsigned short)(address >> 16);\r |
72 | \r |
73 | // jump to other buffer:\r |
74 | gp2x_screen = gp2x_screens[++screensel&3];\r |
75 | }\r |
76 | \r |
77 | \r |
78 | void gp2x_video_changemode(int bpp)\r |
79 | {\r |
80 | gp2x_memregs[0x28DA>>1]=(((bpp+1)/8)<<9)|0xAB; /*8/15/16/24bpp...*/\r |
81 | gp2x_memregs[0x290C>>1]=320*((bpp+1)/8); /*line width in bytes*/\r |
82 | \r |
83 | gp2x_memset_all_buffers(0, 0, 640*480);\r |
84 | gp2x_video_flip();\r |
85 | }\r |
86 | \r |
87 | \r |
88 | void gp2x_video_setpalette(int *pal, int len)\r |
89 | {\r |
90 | unsigned short *g=(unsigned short *)pal;\r |
91 | volatile unsigned short *memreg = &gp2x_memregs[0x295A>>1];\r |
92 | gp2x_memregs[0x2958>>1] = 0;\r |
93 | \r |
94 | len *= 2;\r |
95 | while(len--) *memreg=*g++;\r |
96 | }\r |
97 | \r |
98 | \r |
99 | // TV Compatible function //\r |
100 | void gp2x_video_RGB_setscaling(int W, int H)\r |
101 | {\r |
102 | float escalaw, escalah;\r |
103 | int bpp = (gp2x_memregs[0x28DA>>1]>>9)&0x3;\r |
104 | \r |
105 | escalaw = 1024.0; // RGB Horiz LCD\r |
106 | escalah = 320.0; // RGB Vert LCD\r |
107 | \r |
108 | if(gp2x_memregs[0x2800>>1]&0x100) //TV-Out\r |
109 | {\r |
110 | escalaw=489.0; // RGB Horiz TV (PAL, NTSC)\r |
111 | if (gp2x_memregs[0x2818>>1] == 287) //PAL\r |
112 | escalah=274.0; // RGB Vert TV PAL\r |
113 | else if (gp2x_memregs[0x2818>>1] == 239) //NTSC\r |
114 | escalah=331.0; // RGB Vert TV NTSC\r |
115 | }\r |
116 | \r |
117 | // scale horizontal\r |
118 | gp2x_memregs[0x2906>>1]=(unsigned short)((float)escalaw *(W/320.0));\r |
119 | // scale vertical\r |
120 | gp2x_memregl[0x2908>>2]=(unsigned long)((float)escalah *bpp *(H/240.0));\r |
121 | }\r |
122 | \r |
123 | \r |
124 | /* LCD updates @ 80Hz? */\r |
125 | void gp2x_video_wait_vsync(void)\r |
126 | {\r |
127 | gp2x_memregs[0x2846>>1] = 0x20|2; //(gp2x_memregs[0x2846>>1] | 0x20) & ~2;\r |
128 | while(!(gp2x_memregs[0x2846>>1] & 2));// usleep(1);\r |
129 | }\r |
130 | \r |
131 | \r |
132 | void gp2x_memcpy_all_buffers(void *data, int offset, int len)\r |
133 | {\r |
134 | memcpy((char *)gp2x_screens[0] + offset, data, len);\r |
135 | memcpy((char *)gp2x_screens[1] + offset, data, len);\r |
136 | memcpy((char *)gp2x_screens[2] + offset, data, len);\r |
137 | memcpy((char *)gp2x_screens[3] + offset, data, len);\r |
138 | }\r |
139 | \r |
140 | \r |
141 | void gp2x_memset_all_buffers(int offset, int byte, int len)\r |
142 | {\r |
143 | memset((char *)gp2x_screens[0] + offset, byte, len);\r |
144 | memset((char *)gp2x_screens[1] + offset, byte, len);\r |
145 | memset((char *)gp2x_screens[2] + offset, byte, len);\r |
146 | memset((char *)gp2x_screens[3] + offset, byte, len);\r |
147 | }\r |
148 | \r |
149 | \r |
150 | unsigned long gp2x_joystick_read(int allow_usb_joy)\r |
151 | {\r |
152 | int i;\r |
153 | unsigned long value=(gp2x_memregs[0x1198>>1] & 0x00FF);\r |
154 | if(value==0xFD) value=0xFA;\r |
155 | if(value==0xF7) value=0xEB;\r |
156 | if(value==0xDF) value=0xAF;\r |
157 | if(value==0x7F) value=0xBE;\r |
158 | value = ~((gp2x_memregs[0x1184>>1] & 0xFF00) | value | (gp2x_memregs[0x1186>>1] << 16));\r |
159 | \r |
160 | if (allow_usb_joy && num_of_joys > 0) {\r |
161 | // check the usb joy as well..\r |
162 | gp2x_usbjoy_update();\r |
163 | for (i = 0; i < num_of_joys; i++)\r |
164 | value |= gp2x_usbjoy_check(i);\r |
165 | }\r |
166 | \r |
167 | return value;\r |
168 | }\r |
169 | \r |
170 | static int s_oldrate = 0, s_oldbits = 0, s_oldstereo = 0;\r |
171 | \r |
172 | void gp2x_start_sound(int rate, int bits, int stereo)\r |
173 | {\r |
174 | int frag = 0, bsize, buffers;\r |
175 | \r |
176 | // if no settings change, we don't need to do anything\r |
177 | if (rate == s_oldrate && s_oldbits == bits && s_oldstereo == stereo) return;\r |
178 | \r |
179 | if (sounddev > 0) close(sounddev);\r |
180 | sounddev = open("/dev/dsp", O_WRONLY|O_ASYNC);\r |
181 | if (sounddev == -1)\r |
182 | printf("open(\"/dev/dsp\") failed with %i\n", errno);\r |
183 | \r |
184 | ioctl(sounddev, SNDCTL_DSP_SPEED, &rate);\r |
185 | ioctl(sounddev, SNDCTL_DSP_SETFMT, &bits);\r |
186 | ioctl(sounddev, SNDCTL_DSP_STEREO, &stereo);\r |
187 | // calculate buffer size\r |
188 | buffers = 16;\r |
189 | bsize = rate / 32;\r |
190 | if (rate > 22050) { bsize*=4; buffers*=2; } // 44k mode seems to be very demanding\r |
191 | while ((bsize>>=1)) frag++;\r |
192 | frag |= buffers<<16; // 16 buffers\r |
193 | ioctl(sounddev, SNDCTL_DSP_SETFRAGMENT, &frag);\r |
194 | printf("gp2x_set_sound: %i/%ibit/%s, %i buffers of %i bytes\n",\r |
195 | rate, bits, stereo?"stereo":"mono", frag>>16, 1<<(frag&0xffff));\r |
196 | \r |
197 | s_oldrate = rate; s_oldbits = bits; s_oldstereo = stereo;\r |
198 | usleep(100000);\r |
199 | }\r |
200 | \r |
201 | \r |
202 | void gp2x_sound_write(void *buff, int len)\r |
203 | {\r |
204 | write(sounddev, buff, len);\r |
205 | }\r |
206 | \r |
207 | \r |
208 | void gp2x_sound_volume(int l, int r)\r |
209 | {\r |
210 | l=l<0?0:l; l=l>255?255:l; r=r<0?0:r; r=r>255?255:r;\r |
211 | l<<=8; l|=r;\r |
212 | ioctl(mixerdev, SOUND_MIXER_WRITE_PCM, &l); /*SOUND_MIXER_WRITE_VOLUME*/\r |
213 | }\r |
214 | \r |
215 | \r |
216 | /* 940 */\r |
217 | void Pause940(int yes)\r |
218 | {\r |
219 | if(yes)\r |
220 | gp2x_memregs[0x0904>>1] &= 0xFFFE;\r |
221 | else\r |
222 | gp2x_memregs[0x0904>>1] |= 1;\r |
223 | }\r |
224 | \r |
225 | \r |
226 | void Reset940(int yes)\r |
227 | {\r |
228 | gp2x_memregs[0x3B48>>1] = ((yes&1) << 7) | (0x03); /* bank=3 */\r |
229 | }\r |
230 | \r |
231 | \r |
232 | \r |
233 | /* common */\r |
234 | void gp2x_init(void)\r |
235 | {\r |
236 | printf("entering init()\n"); fflush(stdout);\r |
237 | \r |
238 | memdev = open("/dev/mem", O_RDWR);\r |
239 | if (memdev == -1)\r |
240 | {\r |
241 | printf("open(\"/dev/mem\") failed with %i\n", errno);\r |
242 | exit(1);\r |
243 | }\r |
244 | \r |
245 | gp2x_memregs = mmap(0, 0x10000, PROT_READ|PROT_WRITE, MAP_SHARED, memdev, 0xc0000000);\r |
246 | printf("memregs are @ %p\n", gp2x_memregs);\r |
247 | if(gp2x_memregs == MAP_FAILED)\r |
248 | {\r |
249 | printf("mmap(memregs) failed with %i\n", errno);\r |
250 | exit(1);\r |
251 | }\r |
252 | gp2x_memregl = (unsigned long *) gp2x_memregs;\r |
253 | \r |
254 | gp2x_screens[3] = mmap(0, 640*480*4, PROT_WRITE, MAP_SHARED, memdev, FRAMEBUFF_ADDR3);\r |
255 | if(gp2x_screens[3] == MAP_FAILED)\r |
256 | {\r |
257 | printf("mmap(gp2x_screen) failed with %i\n", errno);\r |
258 | exit(1);\r |
259 | }\r |
260 | printf("framebuffers point to %p\n", gp2x_screens[3]);\r |
261 | gp2x_screens[2] = (char *) gp2x_screens[3]+640*480;\r |
262 | gp2x_screens[1] = (char *) gp2x_screens[2]+640*480;\r |
263 | gp2x_screens[0] = (char *) gp2x_screens[1]+640*480;\r |
264 | \r |
265 | gp2x_screen = gp2x_screens[0];\r |
266 | screensel = 0;\r |
267 | \r |
268 | // snd\r |
269 | mixerdev = open("/dev/mixer", O_RDWR);\r |
270 | if (mixerdev == -1)\r |
271 | printf("open(\"/dev/mixer\") failed with %i\n", errno);\r |
272 | \r |
273 | /* init usb joys -GnoStiC */\r |
274 | gp2x_usbjoy_init();\r |
275 | \r |
276 | printf("exitting init()\n"); fflush(stdout);\r |
277 | }\r |
278 | \r |
279 | char *ext_menu = 0, *ext_state = 0;\r |
280 | \r |
281 | void gp2x_deinit(void)\r |
282 | {\r |
283 | Reset940(1);\r |
284 | Pause940(1);\r |
285 | \r |
286 | gp2x_video_changemode(15);\r |
287 | munmap(gp2x_screens[0], 640*480*4);\r |
288 | munmap((void *)gp2x_memregs, 0x10000);\r |
289 | close(memdev);\r |
290 | close(mixerdev);\r |
291 | if (sounddev > 0) close(sounddev);\r |
292 | \r |
293 | gp2x_usbjoy_deinit();\r |
294 | \r |
295 | printf("all done, running ");\r |
296 | \r |
297 | // Zaq121's alternative frontend support from MAME\r |
298 | if(ext_menu && ext_state) {\r |
299 | printf("%s -state %s\n", ext_menu, ext_state);\r |
300 | execl(ext_menu, ext_menu, "-state", ext_state, NULL);\r |
301 | } else if(ext_menu) {\r |
302 | printf("%s\n", ext_menu);\r |
303 | execl(ext_menu, ext_menu, NULL);\r |
304 | } else {\r |
305 | printf("gp2xmenu\n");\r |
306 | chdir("/usr/gp2x");\r |
307 | execl("gp2xmenu", "gp2xmenu", NULL);\r |
308 | }\r |
309 | }\r |
310 | \r |
311 | \r |