2823a4c8 |
1 | /* gameplaySP |
2 | * |
3 | * Copyright (C) 2006 Exophase <exophase@gmail.com> |
4 | * |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as |
7 | * published by the Free Software Foundation; either version 2 of |
8 | * the License, or (at your option) any later version. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | * General Public License for more details. |
14 | * |
15 | * You should have received a copy of the GNU General Public License |
16 | * along with this program; if not, write to the Free Software |
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
18 | */ |
19 | |
20 | |
21 | #include "common.h" |
22 | #include <SDL.h> |
23 | u32 global_enable_audio = 1; |
24 | |
25 | direct_sound_struct direct_sound_channel[2]; |
26 | gbc_sound_struct gbc_sound_channel[4]; |
27 | |
28 | #if defined(GP2X_BUILD) || defined(TAVI_BUILD) |
29 | u32 sound_frequency = 44100; |
30 | #else |
31 | u32 sound_frequency = 44100; |
32 | #endif |
33 | |
34 | SDL_AudioSpec sound_settings; |
35 | SDL_mutex *sound_mutex; |
36 | SDL_cond *sound_cv; |
37 | |
38 | #ifndef PSP_BUILD |
39 | u32 audio_buffer_size_number = 7; |
40 | #else |
41 | u32 audio_buffer_size_number = 1; |
42 | #endif |
43 | |
44 | u32 audio_buffer_size; |
45 | u32 sound_on = 0; |
46 | s16 sound_buffer[BUFFER_SIZE]; |
47 | u32 sound_buffer_base = 0; |
48 | |
49 | u32 sound_last_cpu_ticks = 0; |
50 | fixed16_16 gbc_sound_tick_step; |
51 | |
52 | // Queue 1, 2, or 4 samples to the top of the DS FIFO, wrap around circularly |
53 | |
54 | #define sound_timer_queue(size, value) \ |
55 | *((s##size *)(ds->fifo + ds->fifo_top)) = value; \ |
56 | ds->fifo_top = (ds->fifo_top + 1) % 32; \ |
57 | |
58 | void sound_timer_queue8(u32 channel, u8 value) |
59 | { |
60 | direct_sound_struct *ds = direct_sound_channel + channel; |
61 | sound_timer_queue(8, value); |
62 | } |
63 | |
64 | void sound_timer_queue16(u32 channel, u16 value) |
65 | { |
66 | direct_sound_struct *ds = direct_sound_channel + channel; |
67 | sound_timer_queue(8, value & 0xFF); |
68 | sound_timer_queue(8, value >> 8); |
69 | } |
70 | |
71 | void sound_timer_queue32(u32 channel, u32 value) |
72 | { |
73 | direct_sound_struct *ds = direct_sound_channel + channel; |
74 | |
75 | sound_timer_queue(8, value & 0xFF); |
76 | sound_timer_queue(8, (value >> 8) & 0xFF); |
77 | sound_timer_queue(8, (value >> 16) & 0xFF); |
78 | sound_timer_queue(8, value >> 24); |
79 | } |
80 | |
81 | // Unqueue 1 sample from the base of the DS FIFO and place it on the audio |
82 | // buffer for as many samples as necessary. If the DS FIFO is 16 bytes or |
83 | // smaller and if DMA is enabled for the sound channel initiate a DMA transfer |
84 | // to the DS FIFO. |
85 | |
86 | #define render_sample_null() \ |
87 | |
88 | #define render_sample_left() \ |
89 | sound_buffer[buffer_index] += current_sample + \ |
90 | fp16_16_to_u32((next_sample - current_sample) * fifo_fractional) \ |
91 | |
92 | #define render_sample_right() \ |
93 | sound_buffer[buffer_index + 1] += current_sample + \ |
94 | fp16_16_to_u32((next_sample - current_sample) * fifo_fractional) \ |
95 | |
96 | #define render_sample_both() \ |
97 | dest_sample = current_sample + \ |
98 | fp16_16_to_u32((next_sample - current_sample) * fifo_fractional); \ |
99 | sound_buffer[buffer_index] += dest_sample; \ |
100 | sound_buffer[buffer_index + 1] += dest_sample \ |
101 | |
102 | #define render_samples(type) \ |
103 | while(fifo_fractional <= 0xFFFF) \ |
104 | { \ |
105 | render_sample_##type(); \ |
106 | fifo_fractional += frequency_step; \ |
107 | buffer_index = (buffer_index + 2) % BUFFER_SIZE; \ |
108 | } \ |
109 | |
110 | void sound_timer(fixed16_16 frequency_step, u32 channel) |
111 | { |
112 | direct_sound_struct *ds = direct_sound_channel + channel; |
113 | |
114 | fixed16_16 fifo_fractional = ds->fifo_fractional; |
115 | u32 buffer_index = ds->buffer_index; |
116 | s16 current_sample, next_sample, dest_sample; |
117 | |
118 | current_sample = ds->fifo[ds->fifo_base] << 4; |
119 | ds->fifo_base = (ds->fifo_base + 1) % 32; |
120 | next_sample = ds->fifo[ds->fifo_base] << 4; |
121 | |
122 | if(sound_on == 1) |
123 | { |
124 | if(ds->volume == DIRECT_SOUND_VOLUME_50) |
125 | { |
126 | current_sample >>= 1; |
127 | next_sample >>= 1; |
128 | } |
129 | |
130 | switch(ds->status) |
131 | { |
132 | case DIRECT_SOUND_INACTIVE: |
133 | render_samples(null); |
134 | break; |
135 | |
136 | case DIRECT_SOUND_RIGHT: |
137 | render_samples(right); |
138 | break; |
139 | |
140 | case DIRECT_SOUND_LEFT: |
141 | render_samples(left); |
142 | break; |
143 | |
144 | case DIRECT_SOUND_LEFTRIGHT: |
145 | render_samples(both); |
146 | break; |
147 | } |
148 | } |
149 | else |
150 | { |
151 | render_samples(null); |
152 | } |
153 | |
154 | ds->buffer_index = buffer_index; |
155 | ds->fifo_fractional = fp16_16_fractional_part(fifo_fractional); |
156 | |
157 | if(((ds->fifo_top - ds->fifo_base) % 32) <= 16) |
158 | { |
159 | if(dma[1].direct_sound_channel == channel) |
160 | dma_transfer(dma + 1); |
161 | |
162 | if(dma[2].direct_sound_channel == channel) |
163 | dma_transfer(dma + 2); |
164 | } |
165 | } |
166 | |
167 | void sound_reset_fifo(u32 channel) |
168 | { |
169 | direct_sound_struct *ds = direct_sound_channel; |
170 | |
171 | memset(ds->fifo, 0, 32); |
172 | } |
173 | |
174 | // Initial pattern data = 4bits (signed) |
175 | // Channel volume = 12bits |
176 | // Envelope volume = 14bits |
177 | // Master volume = 2bits |
178 | |
179 | // Recalculate left and right volume as volume changes. |
180 | // To calculate the current sample, use (sample * volume) >> 16 |
181 | |
182 | // Square waves range from -8 (low) to 7 (high) |
183 | |
184 | s8 square_pattern_duty[4][8] = |
185 | { |
186 | { 0xF8, 0xF8, 0xF8, 0xF8, 0x07, 0xF8, 0xF8, 0xF8 }, |
187 | { 0xF8, 0xF8, 0xF8, 0xF8, 0x07, 0x07, 0xF8, 0xF8 }, |
188 | { 0xF8, 0xF8, 0x07, 0x07, 0x07, 0x07, 0xF8, 0xF8 }, |
189 | { 0x07, 0x07, 0x07, 0x07, 0xF8, 0xF8, 0x07, 0x07 }, |
190 | }; |
191 | |
192 | s8 wave_samples[64]; |
193 | |
194 | u32 noise_table15[1024]; |
195 | u32 noise_table7[4]; |
196 | |
197 | u32 gbc_sound_master_volume_table[4] = { 1, 2, 4, 0 }; |
198 | |
199 | u32 gbc_sound_channel_volume_table[8] = |
200 | { |
201 | fixed_div(0, 7, 12), |
202 | fixed_div(1, 7, 12), |
203 | fixed_div(2, 7, 12), |
204 | fixed_div(3, 7, 12), |
205 | fixed_div(4, 7, 12), |
206 | fixed_div(5, 7, 12), |
207 | fixed_div(6, 7, 12), |
208 | fixed_div(7, 7, 12) |
209 | }; |
210 | |
211 | u32 gbc_sound_envelope_volume_table[16] = |
212 | { |
213 | fixed_div(0, 15, 14), |
214 | fixed_div(1, 15, 14), |
215 | fixed_div(2, 15, 14), |
216 | fixed_div(3, 15, 14), |
217 | fixed_div(4, 15, 14), |
218 | fixed_div(5, 15, 14), |
219 | fixed_div(6, 15, 14), |
220 | fixed_div(7, 15, 14), |
221 | fixed_div(8, 15, 14), |
222 | fixed_div(9, 15, 14), |
223 | fixed_div(10, 15, 14), |
224 | fixed_div(11, 15, 14), |
225 | fixed_div(12, 15, 14), |
226 | fixed_div(13, 15, 14), |
227 | fixed_div(14, 15, 14), |
228 | fixed_div(15, 15, 14) |
229 | }; |
230 | |
231 | u32 gbc_sound_buffer_index = 0; |
232 | u32 gbc_sound_last_cpu_ticks = 0; |
233 | u32 gbc_sound_partial_ticks = 0; |
234 | |
235 | u32 gbc_sound_master_volume_left; |
236 | u32 gbc_sound_master_volume_right; |
237 | u32 gbc_sound_master_volume; |
238 | |
239 | #define update_volume_channel_envelope(channel) \ |
240 | volume_##channel = gbc_sound_envelope_volume_table[envelope_volume] * \ |
241 | gbc_sound_channel_volume_table[gbc_sound_master_volume_##channel] * \ |
242 | gbc_sound_master_volume_table[gbc_sound_master_volume] \ |
243 | |
244 | #define update_volume_channel_noenvelope(channel) \ |
245 | volume_##channel = gs->wave_volume * \ |
246 | gbc_sound_channel_volume_table[gbc_sound_master_volume_##channel] * \ |
247 | gbc_sound_master_volume_table[gbc_sound_master_volume] \ |
248 | |
249 | #define update_volume(type) \ |
250 | update_volume_channel_##type(left); \ |
251 | update_volume_channel_##type(right) \ |
252 | |
253 | #define update_tone_sweep() \ |
254 | if(gs->sweep_status) \ |
255 | { \ |
256 | u32 sweep_ticks = gs->sweep_ticks - 1; \ |
257 | \ |
258 | if(sweep_ticks == 0) \ |
259 | { \ |
260 | u32 rate = gs->rate; \ |
261 | \ |
262 | if(gs->sweep_direction) \ |
263 | rate = rate - (rate >> gs->sweep_shift); \ |
264 | else \ |
265 | rate = rate + (rate >> gs->sweep_shift); \ |
266 | \ |
267 | if(rate > 2048) \ |
268 | rate = 2048; \ |
269 | \ |
270 | frequency_step = float_to_fp16_16(((131072.0 / (2048 - rate)) * 8.0) / \ |
271 | sound_frequency); \ |
272 | \ |
273 | gs->frequency_step = frequency_step; \ |
274 | gs->rate = rate; \ |
275 | \ |
276 | sweep_ticks = gs->sweep_initial_ticks; \ |
277 | } \ |
278 | gs->sweep_ticks = sweep_ticks; \ |
279 | } \ |
280 | |
281 | #define update_tone_nosweep() \ |
282 | |
283 | #define update_tone_envelope() \ |
284 | if(gs->envelope_status) \ |
285 | { \ |
286 | u32 envelope_ticks = gs->envelope_ticks - 1; \ |
287 | envelope_volume = gs->envelope_volume; \ |
288 | \ |
289 | if(envelope_ticks == 0) \ |
290 | { \ |
291 | if(gs->envelope_direction) \ |
292 | { \ |
293 | if(envelope_volume != 15) \ |
294 | envelope_volume = gs->envelope_volume + 1; \ |
295 | } \ |
296 | else \ |
297 | { \ |
298 | if(envelope_volume != 0) \ |
299 | envelope_volume = gs->envelope_volume - 1; \ |
300 | } \ |
301 | \ |
302 | update_volume(envelope); \ |
303 | \ |
304 | gs->envelope_volume = envelope_volume; \ |
305 | gs->envelope_ticks = gs->envelope_initial_ticks; \ |
306 | } \ |
307 | else \ |
308 | { \ |
309 | gs->envelope_ticks = envelope_ticks; \ |
310 | } \ |
311 | } \ |
312 | |
313 | #define update_tone_noenvelope() \ |
314 | |
315 | #define gbc_sound_synchronize() \ |
316 | while(((gbc_sound_buffer_index - sound_buffer_base) % BUFFER_SIZE) > \ |
317 | (audio_buffer_size * 2)) \ |
318 | { \ |
319 | SDL_CondWait(sound_cv, sound_mutex); \ |
320 | } \ |
321 | |
322 | #define update_tone_counters(envelope_op, sweep_op) \ |
323 | tick_counter += gbc_sound_tick_step; \ |
324 | if(tick_counter > 0xFFFF) \ |
325 | { \ |
326 | if(gs->length_status) \ |
327 | { \ |
328 | u32 length_ticks = gs->length_ticks - 1; \ |
329 | gs->length_ticks = length_ticks; \ |
330 | \ |
331 | if(length_ticks == 0) \ |
332 | { \ |
333 | gs->active_flag = 0; \ |
334 | break; \ |
335 | } \ |
336 | } \ |
337 | \ |
338 | update_tone_##envelope_op(); \ |
339 | update_tone_##sweep_op(); \ |
340 | \ |
341 | tick_counter &= 0xFFFF; \ |
342 | } \ |
343 | |
344 | #define gbc_sound_render_sample_right() \ |
345 | sound_buffer[buffer_index + 1] += (current_sample * volume_right) >> 22 \ |
346 | |
347 | #define gbc_sound_render_sample_left() \ |
348 | sound_buffer[buffer_index] += (current_sample * volume_left) >> 22 \ |
349 | |
350 | #define gbc_sound_render_sample_both() \ |
351 | gbc_sound_render_sample_right(); \ |
352 | gbc_sound_render_sample_left() \ |
353 | |
354 | #define gbc_sound_render_samples(type, sample_length, envelope_op, sweep_op) \ |
355 | for(i = 0; i < buffer_ticks; i++) \ |
356 | { \ |
357 | current_sample = \ |
358 | sample_data[fp16_16_to_u32(sample_index) % sample_length]; \ |
359 | gbc_sound_render_sample_##type(); \ |
360 | \ |
361 | sample_index += frequency_step; \ |
362 | buffer_index = (buffer_index + 2) % BUFFER_SIZE; \ |
363 | \ |
364 | update_tone_counters(envelope_op, sweep_op); \ |
365 | } \ |
366 | |
367 | #define gbc_noise_wrap_full 32767 |
368 | |
369 | #define gbc_noise_wrap_half 126 |
370 | |
371 | #define get_noise_sample_full() \ |
372 | current_sample = \ |
373 | ((s32)(noise_table15[fp16_16_to_u32(sample_index) >> 5] << \ |
374 | (fp16_16_to_u32(sample_index) & 0x1F)) >> 31) & 0x0F \ |
375 | |
376 | #define get_noise_sample_half() \ |
377 | current_sample = \ |
378 | ((s32)(noise_table7[fp16_16_to_u32(sample_index) >> 5] << \ |
379 | (fp16_16_to_u32(sample_index) & 0x1F)) >> 31) & 0x0F \ |
380 | |
381 | #define gbc_sound_render_noise(type, noise_type, envelope_op, sweep_op) \ |
382 | for(i = 0; i < buffer_ticks; i++) \ |
383 | { \ |
384 | get_noise_sample_##noise_type(); \ |
385 | gbc_sound_render_sample_##type(); \ |
386 | \ |
387 | sample_index += frequency_step; \ |
388 | \ |
389 | if(sample_index >= u32_to_fp16_16(gbc_noise_wrap_##noise_type)) \ |
390 | sample_index -= u32_to_fp16_16(gbc_noise_wrap_##noise_type); \ |
391 | \ |
392 | buffer_index = (buffer_index + 2) % BUFFER_SIZE; \ |
393 | update_tone_counters(envelope_op, sweep_op); \ |
394 | } \ |
395 | |
396 | #define gbc_sound_render_channel(type, sample_length, envelope_op, sweep_op) \ |
397 | buffer_index = gbc_sound_buffer_index; \ |
398 | sample_index = gs->sample_index; \ |
399 | frequency_step = gs->frequency_step; \ |
400 | tick_counter = gs->tick_counter; \ |
401 | \ |
402 | update_volume(envelope_op); \ |
403 | \ |
404 | switch(gs->status) \ |
405 | { \ |
406 | case GBC_SOUND_INACTIVE: \ |
407 | break; \ |
408 | \ |
409 | case GBC_SOUND_LEFT: \ |
410 | gbc_sound_render_##type(left, sample_length, envelope_op, sweep_op); \ |
411 | break; \ |
412 | \ |
413 | case GBC_SOUND_RIGHT: \ |
414 | gbc_sound_render_##type(right, sample_length, envelope_op, sweep_op); \ |
415 | break; \ |
416 | \ |
417 | case GBC_SOUND_LEFTRIGHT: \ |
418 | gbc_sound_render_##type(both, sample_length, envelope_op, sweep_op); \ |
419 | break; \ |
420 | } \ |
421 | \ |
422 | gs->sample_index = sample_index; \ |
423 | gs->tick_counter = tick_counter; \ |
424 | |
425 | #define gbc_sound_load_wave_ram(bank) \ |
426 | wave_bank = wave_samples + (bank * 32); \ |
427 | for(i = 0, i2 = 0; i < 16; i++, i2 += 2) \ |
428 | { \ |
429 | current_sample = wave_ram[i]; \ |
430 | wave_bank[i2] = (((current_sample >> 4) & 0x0F) - 8); \ |
431 | wave_bank[i2 + 1] = ((current_sample & 0x0F) - 8); \ |
432 | } \ |
433 | |
434 | void synchronize_sound() |
435 | { |
436 | SDL_LockMutex(sound_mutex); |
437 | |
438 | gbc_sound_synchronize(); |
439 | |
440 | SDL_UnlockMutex(sound_mutex); |
441 | } |
442 | |
443 | void update_gbc_sound(u32 cpu_ticks) |
444 | { |
445 | fixed16_16 buffer_ticks = float_to_fp16_16(((float)(cpu_ticks - |
446 | gbc_sound_last_cpu_ticks) * sound_frequency) / 16777216.0); |
447 | u32 i, i2; |
448 | gbc_sound_struct *gs = gbc_sound_channel; |
449 | fixed16_16 sample_index, frequency_step; |
450 | fixed16_16 tick_counter; |
451 | u32 buffer_index; |
452 | s32 volume_left, volume_right; |
453 | u32 envelope_volume; |
454 | s32 current_sample; |
455 | u32 sound_status = address16(io_registers, 0x84) & 0xFFF0; |
456 | s8 *sample_data; |
457 | s8 *wave_bank; |
458 | u8 *wave_ram = ((u8 *)io_registers) + 0x90; |
459 | |
460 | gbc_sound_partial_ticks += fp16_16_fractional_part(buffer_ticks); |
461 | buffer_ticks = fp16_16_to_u32(buffer_ticks); |
462 | |
463 | if(gbc_sound_partial_ticks > 0xFFFF) |
464 | { |
465 | buffer_ticks += 1; |
466 | gbc_sound_partial_ticks &= 0xFFFF; |
467 | } |
468 | |
469 | SDL_LockMutex(sound_mutex); |
470 | if(synchronize_flag) |
471 | { |
472 | if(((gbc_sound_buffer_index - sound_buffer_base) % BUFFER_SIZE) > |
473 | (audio_buffer_size * 3 / 2)) |
474 | { |
475 | while(((gbc_sound_buffer_index - sound_buffer_base) % BUFFER_SIZE) > |
476 | (audio_buffer_size * 3 / 2)) |
477 | { |
478 | SDL_CondWait(sound_cv, sound_mutex); |
479 | } |
480 | |
481 | #ifdef PSP_BUILD |
482 | if(current_frameskip_type == auto_frameskip) |
483 | { |
484 | sceDisplayWaitVblankStart(); |
485 | real_frame_count = 0; |
486 | virtual_frame_count = 0; |
487 | } |
488 | #endif |
489 | |
490 | /* |
491 | |
492 | #ifdef GP2X_BUILD |
493 | if(current_frameskip_type == auto_frameskip) |
494 | { |
495 | u64 current_ticks; |
496 | u64 next_ticks; |
497 | get_ticks_us(¤t_ticks); |
498 | |
499 | next_ticks = ((current_ticks + 16666) / 16667) * 16667; |
500 | delay_us(next_ticks - current_ticks); |
501 | |
502 | get_ticks_us(&frame_count_initial_timestamp); |
503 | real_frame_count = 0; |
504 | virtual_frame_count = 0; |
505 | } |
506 | #endif |
507 | |
508 | */ |
509 | } |
510 | } |
511 | if(sound_on == 1) |
512 | { |
513 | gs = gbc_sound_channel + 0; |
514 | if(gs->active_flag) |
515 | { |
516 | sound_status |= 0x01; |
517 | sample_data = gs->sample_data; |
518 | envelope_volume = gs->envelope_volume; |
519 | gbc_sound_render_channel(samples, 8, envelope, sweep); |
520 | } |
521 | |
522 | gs = gbc_sound_channel + 1; |
523 | if(gs->active_flag) |
524 | { |
525 | sound_status |= 0x02; |
526 | sample_data = gs->sample_data; |
527 | envelope_volume = gs->envelope_volume; |
528 | gbc_sound_render_channel(samples, 8, envelope, nosweep); |
529 | } |
530 | |
531 | gs = gbc_sound_channel + 2; |
532 | if(gbc_sound_wave_update) |
533 | { |
534 | if(gs->wave_bank == 1) |
535 | { |
536 | gbc_sound_load_wave_ram(1); |
537 | } |
538 | else |
539 | { |
540 | gbc_sound_load_wave_ram(0); |
541 | } |
542 | |
543 | gbc_sound_wave_update = 0; |
544 | } |
545 | |
546 | if((gs->active_flag) && (gs->master_enable)) |
547 | { |
548 | sound_status |= 0x04; |
549 | sample_data = wave_samples; |
550 | if(gs->wave_type == 0) |
551 | { |
552 | if(gs->wave_bank == 1) |
553 | sample_data += 32; |
554 | |
555 | gbc_sound_render_channel(samples, 32, noenvelope, nosweep); |
556 | } |
557 | else |
558 | { |
559 | gbc_sound_render_channel(samples, 64, noenvelope, nosweep); |
560 | } |
561 | } |
562 | |
563 | gs = gbc_sound_channel + 3; |
564 | if(gs->active_flag) |
565 | { |
566 | sound_status |= 0x08; |
567 | envelope_volume = gs->envelope_volume; |
568 | |
569 | if(gs->noise_type == 1) |
570 | { |
571 | gbc_sound_render_channel(noise, half, envelope, nosweep); |
572 | } |
573 | else |
574 | { |
575 | gbc_sound_render_channel(noise, full, envelope, nosweep); |
576 | } |
577 | } |
578 | } |
579 | |
580 | address16(io_registers, 0x84) = sound_status; |
581 | |
2823a4c8 |
582 | gbc_sound_last_cpu_ticks = cpu_ticks; |
583 | gbc_sound_buffer_index = |
584 | (gbc_sound_buffer_index + (buffer_ticks * 2)) % BUFFER_SIZE; |
e9c7b137 |
585 | |
586 | SDL_UnlockMutex(sound_mutex); |
587 | |
588 | SDL_CondSignal(sound_cv); |
2823a4c8 |
589 | } |
590 | |
591 | #define sound_copy_normal() \ |
592 | current_sample = source[i] \ |
593 | |
594 | #define sound_copy(source_offset, length, render_type) \ |
595 | _length = (length) / 2; \ |
596 | source = (s16 *)(sound_buffer + source_offset); \ |
597 | for(i = 0; i < _length; i++) \ |
598 | { \ |
599 | sound_copy_##render_type(); \ |
600 | if(current_sample > 2047) \ |
601 | current_sample = 2047; \ |
602 | if(current_sample < -2048) \ |
603 | current_sample = -2048; \ |
604 | \ |
605 | stream_base[i] = current_sample << 4; \ |
606 | source[i] = 0; \ |
607 | } \ |
608 | |
609 | #define sound_copy_null(source_offset, length) \ |
610 | _length = (length) / 2; \ |
611 | source = (s16 *)(sound_buffer + source_offset); \ |
612 | for(i = 0; i < _length; i++) \ |
613 | { \ |
614 | stream_base[i] = 0; \ |
615 | source[i] = 0; \ |
616 | } \ |
617 | |
618 | |
619 | void sound_callback(void *userdata, Uint8 *stream, int length) |
620 | { |
621 | u32 sample_length = length / 2; |
622 | u32 _length; |
623 | u32 i; |
624 | s16 *stream_base = (s16 *)stream; |
625 | s16 *source; |
626 | s32 current_sample; |
627 | |
628 | SDL_LockMutex(sound_mutex); |
629 | |
630 | while(((gbc_sound_buffer_index - sound_buffer_base) % BUFFER_SIZE) < |
631 | length) |
632 | { |
633 | SDL_CondWait(sound_cv, sound_mutex); |
634 | } |
635 | |
636 | if(global_enable_audio) |
637 | { |
638 | if((sound_buffer_base + sample_length) >= BUFFER_SIZE) |
639 | { |
640 | u32 partial_length = (BUFFER_SIZE - sound_buffer_base) * 2; |
641 | sound_copy(sound_buffer_base, partial_length, normal); |
642 | source = (s16 *)sound_buffer; |
643 | sound_copy(0, length - partial_length, normal); |
644 | sound_buffer_base = (length - partial_length) / 2; |
645 | } |
646 | else |
647 | { |
648 | sound_copy(sound_buffer_base, length, normal); |
649 | sound_buffer_base += sample_length; |
650 | } |
651 | } |
652 | else |
653 | { |
654 | if((sound_buffer_base + sample_length) >= BUFFER_SIZE) |
655 | { |
656 | u32 partial_length = (BUFFER_SIZE - sound_buffer_base) * 2; |
657 | sound_copy_null(sound_buffer_base, partial_length); |
658 | source = (s16 *)sound_buffer; |
659 | sound_copy(0, length - partial_length, normal); |
660 | sound_buffer_base = (length - partial_length) / 2; |
661 | } |
662 | else |
663 | { |
664 | sound_copy_null(sound_buffer_base, length); |
665 | sound_buffer_base += sample_length; |
666 | } |
667 | } |
668 | |
669 | SDL_CondSignal(sound_cv); |
670 | |
671 | SDL_UnlockMutex(sound_mutex); |
672 | } |
673 | |
674 | // Special thanks to blarrg for the LSFR frequency used in Meridian, as posted |
675 | // on the forum at http://meridian.overclocked.org: |
676 | // http://meridian.overclocked.org/cgi-bin/wwwthreads/showpost.pl?Board=merid |
677 | // angeneraldiscussion&Number=2069&page=0&view=expanded&mode=threaded&sb=4 |
678 | // Hope you don't mind me borrowing it ^_- |
679 | |
680 | void init_noise_table(u32 *table, u32 period, u32 bit_length) |
681 | { |
682 | u32 shift_register = 0xFF; |
683 | u32 mask = ~(1 << bit_length); |
684 | s32 table_pos, bit_pos; |
685 | u32 current_entry; |
686 | u32 table_period = (period + 31) / 32; |
687 | |
688 | // Bits are stored in reverse order so they can be more easily moved to |
689 | // bit 31, for sign extended shift down. |
690 | |
691 | for(table_pos = 0; table_pos < table_period; table_pos++) |
692 | { |
693 | current_entry = 0; |
694 | for(bit_pos = 31; bit_pos >= 0; bit_pos--) |
695 | { |
696 | current_entry |= (shift_register & 0x01) << bit_pos; |
697 | |
698 | shift_register = |
699 | ((1 & (shift_register ^ (shift_register >> 1))) << bit_length) | |
700 | ((shift_register >> 1) & mask); |
701 | } |
702 | |
703 | table[table_pos] = current_entry; |
704 | } |
705 | } |
706 | |
707 | void reset_sound() |
708 | { |
709 | direct_sound_struct *ds = direct_sound_channel; |
710 | gbc_sound_struct *gs = gbc_sound_channel; |
711 | u32 i; |
712 | |
713 | sound_on = 0; |
714 | sound_buffer_base = 0; |
715 | sound_last_cpu_ticks = 0; |
716 | memset(sound_buffer, 0, audio_buffer_size); |
717 | |
718 | for(i = 0; i < 2; i++, ds++) |
719 | { |
720 | ds->buffer_index = 0; |
721 | ds->status = DIRECT_SOUND_INACTIVE; |
722 | ds->fifo_top = 0; |
723 | ds->fifo_base = 0; |
724 | ds->fifo_fractional = 0; |
725 | ds->last_cpu_ticks = 0; |
726 | memset(ds->fifo, 0, 32); |
727 | } |
728 | |
729 | gbc_sound_buffer_index = 0; |
730 | gbc_sound_last_cpu_ticks = 0; |
731 | gbc_sound_partial_ticks = 0; |
732 | |
733 | gbc_sound_master_volume_left = 0; |
734 | gbc_sound_master_volume_right = 0; |
735 | gbc_sound_master_volume = 0; |
736 | memset(wave_samples, 0, 64); |
737 | |
738 | for(i = 0; i < 4; i++, gs++) |
739 | { |
740 | gs->status = GBC_SOUND_INACTIVE; |
741 | gs->sample_data = square_pattern_duty[2]; |
742 | gs->active_flag = 0; |
743 | } |
744 | } |
745 | |
746 | void sound_exit() |
747 | { |
748 | gbc_sound_buffer_index = |
749 | (sound_buffer_base + audio_buffer_size) % BUFFER_SIZE; |
750 | SDL_PauseAudio(1); |
751 | SDL_CondSignal(sound_cv); |
752 | } |
753 | |
754 | void init_sound() |
755 | { |
756 | #ifdef PSP_BUILD |
757 | audio_buffer_size = (audio_buffer_size_number * 1024) + 3072; |
758 | #elif defined(TAVI_BUILD) || defined(ARM_ARCH) |
759 | audio_buffer_size = 16 << audio_buffer_size_number; |
760 | // audio_buffer_size = 16384; |
761 | #else |
762 | audio_buffer_size = 16384; |
763 | #endif |
764 | |
765 | SDL_AudioSpec desired_spec = |
766 | { |
767 | sound_frequency, |
768 | AUDIO_S16, |
769 | 2, |
770 | 0, |
771 | audio_buffer_size / 4, |
772 | 0, |
773 | 0, |
774 | sound_callback, |
775 | NULL |
776 | }; |
777 | |
778 | gbc_sound_tick_step = |
779 | float_to_fp16_16(256.0 / sound_frequency); |
780 | |
781 | init_noise_table(noise_table15, 32767, 14); |
782 | init_noise_table(noise_table7, 127, 6); |
783 | |
784 | reset_sound(); |
785 | |
786 | SDL_OpenAudio(&desired_spec, &sound_settings); |
787 | sound_frequency = sound_settings.freq; |
788 | sound_mutex = SDL_CreateMutex(); |
789 | sound_cv = SDL_CreateCond(); |
790 | SDL_PauseAudio(0); |
791 | } |
792 | |
793 | #define sound_savestate_builder(type) \ |
794 | void sound_##type##_savestate(file_tag_type savestate_file) \ |
795 | { \ |
796 | file_##type##_variable(savestate_file, sound_on); \ |
797 | file_##type##_variable(savestate_file, sound_buffer_base); \ |
798 | file_##type##_variable(savestate_file, sound_last_cpu_ticks); \ |
799 | file_##type##_variable(savestate_file, gbc_sound_buffer_index); \ |
800 | file_##type##_variable(savestate_file, gbc_sound_last_cpu_ticks); \ |
801 | file_##type##_variable(savestate_file, gbc_sound_partial_ticks); \ |
802 | file_##type##_variable(savestate_file, gbc_sound_master_volume_left); \ |
803 | file_##type##_variable(savestate_file, gbc_sound_master_volume_right); \ |
804 | file_##type##_variable(savestate_file, gbc_sound_master_volume); \ |
805 | file_##type##_array(savestate_file, wave_samples); \ |
806 | file_##type##_array(savestate_file, direct_sound_channel); \ |
807 | file_##type##_array(savestate_file, gbc_sound_channel); \ |
808 | } \ |
809 | |
810 | sound_savestate_builder(read); |
811 | sound_savestate_builder(write_mem); |
812 | |