cc68a136 |
1 | // This is part of Pico Library\r |
2 | \r |
3 | // (c) Copyright 2004 Dave, All rights reserved.\r |
4 | // (c) Copyright 2006 notaz, All rights reserved.\r |
5 | // Free for non-commercial use.\r |
6 | \r |
7 | // For commercial use, separate licencing terms must be obtained.\r |
8 | \r |
9 | \r |
10 | #include <string.h>\r |
11 | #include "sound.h"\r |
12 | #include "ym2612.h"\r |
13 | #include "sn76496.h"\r |
14 | \r |
15 | #ifndef __GNUC__\r |
16 | #pragma warning (disable:4244)\r |
17 | #endif\r |
18 | \r |
19 | #if defined(_USE_MZ80)\r |
20 | #include "../../cpu/mz80/mz80.h"\r |
21 | #elif defined(_USE_DRZ80)\r |
22 | #include "../../cpu/DrZ80/drz80.h"\r |
23 | #endif\r |
24 | \r |
25 | #include "../PicoInt.h"\r |
26 | \r |
27 | \r |
28 | //int z80CycleAim = 0;\r |
29 | \r |
30 | // dac\r |
31 | short *dac_out;\r |
32 | unsigned short dac_info[312]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample\r |
33 | \r |
34 | // for Pico\r |
35 | int PsndRate=0;\r |
36 | int PsndLen=0; // number of mono samples, multiply by 2 for stereo\r |
37 | short *PsndOut=NULL; // PCM data buffer\r |
38 | \r |
39 | // from ym2612.c\r |
40 | extern int *ym2612_dacen;\r |
41 | extern INT32 *ym2612_dacout;\r |
42 | void YM2612TimerHandler(int c,int cnt);\r |
43 | \r |
44 | // sn76496\r |
45 | extern int *sn76496_regs;\r |
46 | \r |
47 | \r |
48 | static void dac_recalculate()\r |
49 | {\r |
50 | int i, dac_cnt, pos, len, lines = Pico.m.pal ? 312 : 262, mid = Pico.m.pal ? 68 : 93;\r |
51 | \r |
52 | if(PsndLen <= lines) {\r |
53 | // shrinking algo\r |
54 | dac_cnt = 0;//lines - PsndLen;\r |
55 | len=1; pos=0;\r |
56 | dac_info[225] = 1;\r |
57 | \r |
58 | for(i=226; i != 225; i++) {\r |
59 | if (i >= lines) i = 0;\r |
60 | len = 0;\r |
61 | if(dac_cnt < 0) {\r |
62 | len=1;\r |
63 | pos++;\r |
64 | dac_cnt += lines;\r |
65 | }\r |
66 | dac_cnt -= PsndLen;\r |
67 | dac_info[i] = (pos<<4)|len;\r |
68 | }\r |
69 | } else {\r |
70 | // stretching\r |
71 | dac_cnt = PsndLen/2;\r |
72 | pos=0;\r |
73 | for(i = 225; i != 224; i++) {\r |
74 | if (i >= lines) i = 0;\r |
75 | len=0;\r |
76 | while(dac_cnt >= 0) {\r |
77 | dac_cnt -= lines;\r |
78 | len++;\r |
79 | }\r |
80 | if (i == mid) // midpoint\r |
81 | while(pos+len < PsndLen/2) {\r |
82 | dac_cnt -= lines;\r |
83 | len++;\r |
84 | }\r |
85 | dac_cnt += PsndLen;\r |
86 | dac_info[i] = (pos<<4)|len;\r |
87 | pos+=len;\r |
88 | }\r |
89 | // last sample\r |
90 | for(len = 0, i = pos; i < PsndLen; i++) len++;\r |
91 | dac_info[224] = (pos<<4)|len;\r |
92 | }\r |
93 | // dprintf("rate is %i, len %i", PsndRate, PsndLen);\r |
94 | // for(i=0; i < lines; i++)\r |
95 | // dprintf("%03i : %03i : %i", i, dac_info[i]>>4, dac_info[i]&0xf);\r |
96 | //exit(8);\r |
97 | }\r |
98 | \r |
99 | \r |
100 | void sound_reset()\r |
101 | {\r |
102 | extern int z80stopCycle;\r |
103 | void *ym2612_regs;\r |
104 | \r |
105 | // init even if we are not going to use them, just in case we ever enable it\r |
106 | YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);\r |
107 | // also clear the internal registers+addr line\r |
108 | ym2612_regs = YM2612GetRegs();\r |
109 | memset(ym2612_regs, 0, 0x200+4);\r |
110 | \r |
111 | SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);\r |
112 | \r |
113 | // calculate PsndLen\r |
114 | PsndLen=PsndRate/(Pico.m.pal ? 50 : 60);\r |
115 | \r |
116 | // recalculate dac info\r |
117 | dac_recalculate();\r |
118 | z80stopCycle = 0;\r |
119 | }\r |
120 | \r |
121 | \r |
122 | // to be called after changing sound rate or chips\r |
123 | void sound_rerate()\r |
124 | {\r |
125 | unsigned int state[28];\r |
126 | \r |
127 | YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);\r |
128 | // feed it back it's own registers, just like after loading state\r |
129 | YM2612PicoStateLoad();\r |
130 | \r |
131 | memcpy(state, sn76496_regs, 28*4); // remember old state\r |
132 | SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);\r |
133 | memcpy(sn76496_regs, state, 28*4); // restore old state\r |
134 | \r |
135 | // calculate PsndLen\r |
136 | PsndLen=PsndRate/(Pico.m.pal ? 50 : 60);\r |
137 | \r |
138 | // recalculate dac info\r |
139 | dac_recalculate();\r |
140 | }\r |
141 | \r |
142 | \r |
143 | // This is called once per raster (aka line), but not necessarily for every line\r |
144 | int sound_timers_and_dac(int raster)\r |
145 | {\r |
146 | if(raster >= 0 && PsndOut && (PicoOpt&1) && *ym2612_dacen) {\r |
147 | short dout = (short) *ym2612_dacout;\r |
148 | int pos=dac_info[raster], len=pos&0xf;\r |
149 | short *d;\r |
150 | pos>>=4;\r |
151 | \r |
152 | if(PicoOpt&8) { // only left channel for stereo (will be copied to right by ym2612 mixing code)\r |
153 | d=PsndOut+pos*2;\r |
154 | while(len--) { *d = dout; d += 2; }\r |
155 | } else {\r |
156 | d=PsndOut+pos;\r |
157 | while(len--) *d++ = dout;\r |
158 | }\r |
159 | }\r |
160 | \r |
161 | //dprintf("s: %03i", raster);\r |
162 | \r |
163 | // Our raster lasts 63.61323/64.102564 microseconds (NTSC/PAL)\r |
164 | YM2612PicoTick(1);\r |
165 | \r |
166 | return 0;\r |
167 | }\r |
168 | \r |
169 | \r |
170 | int sound_render(int offset, int length)\r |
171 | {\r |
172 | int stereo = (PicoOpt & 8) >> 3;\r |
173 | offset <<= stereo;\r |
174 | \r |
175 | // PSG\r |
176 | if(PicoOpt & 2)\r |
177 | SN76496Update(PsndOut+offset, length, stereo);\r |
178 | \r |
179 | // Add in the stereo FM buffer\r |
180 | if(PicoOpt & 1) {\r |
181 | YM2612UpdateOne(PsndOut+offset, length, stereo);\r |
182 | } else {\r |
183 | // YM2612 upmixes to stereo, so we have to do this manually here\r |
184 | int i;\r |
185 | short *s = PsndOut+offset;\r |
186 | for (i = 0; i < length; i++) {\r |
187 | *(s+1) = *s; s+=2;\r |
188 | }\r |
189 | }\r |
190 | \r |
191 | return 0;\r |
192 | }\r |
193 | \r |
194 | \r |
195 | \r |
196 | #if defined(_USE_MZ80)\r |
197 | \r |
198 | // memhandlers for mz80 core\r |
199 | unsigned char mz80_read(UINT32 a, struct MemoryReadByte *w) { return z80_read(a); }\r |
200 | void mz80_write(UINT32 a, UINT8 d, struct MemoryWriteByte *w) { z80_write(d, a); }\r |
201 | \r |
202 | // structures for mz80 core\r |
203 | static struct MemoryReadByte mz80_mem_read[]=\r |
204 | {\r |
205 | {0x0000,0xffff,mz80_read},\r |
206 | {(UINT32) -1,(UINT32) -1,NULL}\r |
207 | };\r |
208 | static struct MemoryWriteByte mz80_mem_write[]=\r |
209 | {\r |
210 | {0x0000,0xffff,mz80_write},\r |
211 | {(UINT32) -1,(UINT32) -1,NULL}\r |
212 | };\r |
213 | static struct z80PortRead mz80_io_read[] ={\r |
214 | {(UINT16) -1,(UINT16) -1,NULL}\r |
215 | };\r |
216 | static struct z80PortWrite mz80_io_write[]={\r |
217 | {(UINT16) -1,(UINT16) -1,NULL}\r |
218 | };\r |
219 | \r |
220 | #elif defined(_USE_DRZ80)\r |
221 | \r |
222 | static struct DrZ80 drZ80;\r |
223 | \r |
224 | static unsigned int DrZ80_rebasePC(unsigned short a)\r |
225 | {\r |
226 | drZ80.Z80PC_BASE = (unsigned int) Pico.zram;\r |
227 | return drZ80.Z80PC_BASE + a;\r |
228 | }\r |
229 | \r |
230 | static unsigned int DrZ80_rebaseSP(unsigned short a)\r |
231 | {\r |
232 | drZ80.Z80SP_BASE = (unsigned int) Pico.zram;\r |
233 | return drZ80.Z80SP_BASE + a;\r |
234 | }\r |
235 | \r |
236 | static unsigned char DrZ80_in(unsigned short p)\r |
237 | {\r |
238 | return 0xff;\r |
239 | }\r |
240 | \r |
241 | static void DrZ80_out(unsigned short p,unsigned char d)\r |
242 | {\r |
243 | }\r |
244 | \r |
245 | static void DrZ80_irq_callback()\r |
246 | {\r |
247 | drZ80.Z80_IRQ = 0; // lower irq when accepted\r |
248 | }\r |
249 | \r |
250 | #endif\r |
251 | \r |
252 | // z80 functionality wrappers\r |
253 | void z80_init()\r |
254 | {\r |
255 | #if defined(_USE_MZ80)\r |
256 | struct mz80context z80;\r |
257 | \r |
258 | // z80\r |
259 | mz80init();\r |
260 | // Modify the default context\r |
261 | mz80GetContext(&z80);\r |
262 | \r |
263 | // point mz80 stuff\r |
264 | z80.z80Base=Pico.zram;\r |
265 | z80.z80MemRead=mz80_mem_read;\r |
266 | z80.z80MemWrite=mz80_mem_write;\r |
267 | z80.z80IoRead=mz80_io_read;\r |
268 | z80.z80IoWrite=mz80_io_write;\r |
269 | \r |
270 | mz80SetContext(&z80);\r |
271 | \r |
272 | #elif defined(_USE_DRZ80)\r |
273 | \r |
274 | memset(&drZ80, 0, sizeof(struct DrZ80));\r |
275 | drZ80.z80_rebasePC=DrZ80_rebasePC;\r |
276 | drZ80.z80_rebaseSP=DrZ80_rebaseSP;\r |
277 | drZ80.z80_read8 =z80_read;\r |
278 | drZ80.z80_read16 =z80_read16;\r |
279 | drZ80.z80_write8 =z80_write;\r |
280 | drZ80.z80_write16 =z80_write16;\r |
281 | drZ80.z80_in =DrZ80_in;\r |
282 | drZ80.z80_out =DrZ80_out;\r |
283 | drZ80.z80_irq_callback=DrZ80_irq_callback;\r |
284 | #endif\r |
285 | }\r |
286 | \r |
287 | void z80_reset()\r |
288 | {\r |
289 | #if defined(_USE_MZ80)\r |
290 | mz80reset();\r |
291 | #elif defined(_USE_DRZ80)\r |
292 | memset(&drZ80, 0, 0x54);\r |
293 | drZ80.Z80F = (1<<2); // set ZFlag\r |
294 | drZ80.Z80F2 = (1<<2); // set ZFlag\r |
295 | drZ80.Z80IX = 0xFFFF << 16;\r |
296 | drZ80.Z80IY = 0xFFFF << 16;\r |
297 | drZ80.Z80IM = 0; // 1?\r |
298 | drZ80.Z80PC = drZ80.z80_rebasePC(0);\r |
299 | drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ?\r |
300 | #endif\r |
301 | Pico.m.z80_fakeval = 0; // for faking when Z80 is disabled\r |
302 | }\r |
303 | \r |
304 | void z80_resetCycles()\r |
305 | {\r |
306 | #if defined(_USE_MZ80)\r |
307 | mz80GetElapsedTicks(1);\r |
308 | #endif\r |
309 | }\r |
310 | \r |
311 | void z80_int()\r |
312 | {\r |
313 | #if defined(_USE_MZ80)\r |
314 | mz80int(0);\r |
315 | #elif defined(_USE_DRZ80)\r |
316 | drZ80.z80irqvector = 0xFF; // default IRQ vector RST opcode\r |
317 | drZ80.Z80_IRQ = 1;\r |
318 | #endif\r |
319 | }\r |
320 | \r |
321 | // returns number of cycles actually executed\r |
322 | int z80_run(int cycles)\r |
323 | {\r |
324 | #if defined(_USE_MZ80)\r |
325 | int ticks_pre = mz80GetElapsedTicks(0);\r |
326 | mz80exec(cycles);\r |
327 | return mz80GetElapsedTicks(0) - ticks_pre;\r |
328 | #elif defined(_USE_DRZ80)\r |
329 | return cycles - DrZ80Run(&drZ80, cycles);\r |
330 | #else\r |
331 | return cycles;\r |
332 | #endif\r |
333 | }\r |
334 | \r |
335 | void z80_pack(unsigned char *data)\r |
336 | {\r |
337 | #if defined(_USE_MZ80)\r |
338 | struct mz80context mz80;\r |
339 | *(int *)data = 0x00005A6D; // "mZ"\r |
340 | mz80GetContext(&mz80);\r |
341 | memcpy(data+4, &mz80.z80clockticks, sizeof(mz80)-5*4); // don't save base&memhandlers\r |
342 | #elif defined(_USE_DRZ80)\r |
343 | *(int *)data = 0x015A7244; // "DrZ" v1\r |
344 | drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);\r |
345 | drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);\r |
346 | memcpy(data+4, &drZ80, 0x54);\r |
347 | #endif\r |
348 | }\r |
349 | \r |
350 | void z80_unpack(unsigned char *data)\r |
351 | {\r |
352 | #if defined(_USE_MZ80)\r |
353 | if(*(int *)data == 0x00005A6D) { // "mZ" save?\r |
354 | struct mz80context mz80;\r |
355 | mz80GetContext(&mz80);\r |
356 | memcpy(&mz80.z80clockticks, data+4, sizeof(mz80)-5*4);\r |
357 | mz80SetContext(&mz80);\r |
358 | } else {\r |
359 | z80_reset();\r |
360 | z80_int();\r |
361 | }\r |
362 | #elif defined(_USE_DRZ80)\r |
363 | if(*(int *)data == 0x015A7244) { // "DrZ" v1 save?\r |
364 | memcpy(&drZ80, data+4, 0x54);\r |
365 | // update bases\r |
366 | drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);\r |
367 | drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);\r |
368 | } else {\r |
369 | z80_reset();\r |
370 | drZ80.Z80IM = 1;\r |
371 | z80_int(); // try to goto int handler, maybe we won't execute trash there?\r |
372 | }\r |
373 | #endif\r |
374 | }\r |
375 | \r |
376 | void z80_exit()\r |
377 | {\r |
378 | #if defined(_USE_MZ80)\r |
379 | mz80shutdown();\r |
380 | #endif\r |
381 | }\r |
382 | \r |
383 | #if defined(__DEBUG_PRINT) || defined(WIN32)\r |
384 | void z80_debug(char *dstr)\r |
385 | {\r |
386 | #if defined(_USE_DRZ80)\r |
387 | sprintf(dstr, "%sZ80 state: PC: %04x SP: %04x\n", dstr, drZ80.Z80PC-drZ80.Z80PC_BASE, drZ80.Z80SP-drZ80.Z80SP_BASE);\r |
388 | #endif\r |
389 | }\r |
390 | #endif\r |