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 | |
2823a4c8 |
28 | u32 sound_frequency = 44100; |
2823a4c8 |
29 | |
30 | SDL_AudioSpec sound_settings; |
31 | SDL_mutex *sound_mutex; |
32 | SDL_cond *sound_cv; |
33 | |
2455b6a3 |
34 | #ifdef PSP_BUILD |
2823a4c8 |
35 | u32 audio_buffer_size_number = 1; |
2455b6a3 |
36 | #else |
37 | u32 audio_buffer_size_number = 8; |
2823a4c8 |
38 | #endif |
39 | |
40 | u32 audio_buffer_size; |
41 | u32 sound_on = 0; |
42 | s16 sound_buffer[BUFFER_SIZE]; |
43 | u32 sound_buffer_base = 0; |
44 | |
45 | u32 sound_last_cpu_ticks = 0; |
46 | fixed16_16 gbc_sound_tick_step; |
47 | |
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48 | u32 sound_exit_flag; |
49 | |
2823a4c8 |
50 | // Queue 1, 2, or 4 samples to the top of the DS FIFO, wrap around circularly |
51 | |
52 | #define sound_timer_queue(size, value) \ |
53 | *((s##size *)(ds->fifo + ds->fifo_top)) = value; \ |
54 | ds->fifo_top = (ds->fifo_top + 1) % 32; \ |
55 | |
56 | void sound_timer_queue8(u32 channel, u8 value) |
57 | { |
58 | direct_sound_struct *ds = direct_sound_channel + channel; |
59 | sound_timer_queue(8, value); |
60 | } |
61 | |
62 | void sound_timer_queue16(u32 channel, u16 value) |
63 | { |
64 | direct_sound_struct *ds = direct_sound_channel + channel; |
65 | sound_timer_queue(8, value & 0xFF); |
66 | sound_timer_queue(8, value >> 8); |
67 | } |
68 | |
69 | void sound_timer_queue32(u32 channel, u32 value) |
70 | { |
71 | direct_sound_struct *ds = direct_sound_channel + channel; |
72 | |
73 | sound_timer_queue(8, value & 0xFF); |
74 | sound_timer_queue(8, (value >> 8) & 0xFF); |
75 | sound_timer_queue(8, (value >> 16) & 0xFF); |
76 | sound_timer_queue(8, value >> 24); |
77 | } |
78 | |
79 | // Unqueue 1 sample from the base of the DS FIFO and place it on the audio |
80 | // buffer for as many samples as necessary. If the DS FIFO is 16 bytes or |
81 | // smaller and if DMA is enabled for the sound channel initiate a DMA transfer |
82 | // to the DS FIFO. |
83 | |
84 | #define render_sample_null() \ |
85 | |
86 | #define render_sample_left() \ |
87 | sound_buffer[buffer_index] += current_sample + \ |
88 | fp16_16_to_u32((next_sample - current_sample) * fifo_fractional) \ |
89 | |
90 | #define render_sample_right() \ |
91 | sound_buffer[buffer_index + 1] += current_sample + \ |
92 | fp16_16_to_u32((next_sample - current_sample) * fifo_fractional) \ |
93 | |
94 | #define render_sample_both() \ |
95 | dest_sample = current_sample + \ |
96 | fp16_16_to_u32((next_sample - current_sample) * fifo_fractional); \ |
97 | sound_buffer[buffer_index] += dest_sample; \ |
98 | sound_buffer[buffer_index + 1] += dest_sample \ |
99 | |
100 | #define render_samples(type) \ |
101 | while(fifo_fractional <= 0xFFFF) \ |
102 | { \ |
103 | render_sample_##type(); \ |
104 | fifo_fractional += frequency_step; \ |
105 | buffer_index = (buffer_index + 2) % BUFFER_SIZE; \ |
106 | } \ |
107 | |
108 | void sound_timer(fixed16_16 frequency_step, u32 channel) |
109 | { |
110 | direct_sound_struct *ds = direct_sound_channel + channel; |
111 | |
112 | fixed16_16 fifo_fractional = ds->fifo_fractional; |
113 | u32 buffer_index = ds->buffer_index; |
114 | s16 current_sample, next_sample, dest_sample; |
115 | |
116 | current_sample = ds->fifo[ds->fifo_base] << 4; |
117 | ds->fifo_base = (ds->fifo_base + 1) % 32; |
118 | next_sample = ds->fifo[ds->fifo_base] << 4; |
119 | |
120 | if(sound_on == 1) |
121 | { |
122 | if(ds->volume == DIRECT_SOUND_VOLUME_50) |
123 | { |
124 | current_sample >>= 1; |
125 | next_sample >>= 1; |
126 | } |
127 | |
128 | switch(ds->status) |
129 | { |
130 | case DIRECT_SOUND_INACTIVE: |
131 | render_samples(null); |
132 | break; |
133 | |
134 | case DIRECT_SOUND_RIGHT: |
135 | render_samples(right); |
136 | break; |
137 | |
138 | case DIRECT_SOUND_LEFT: |
139 | render_samples(left); |
140 | break; |
141 | |
142 | case DIRECT_SOUND_LEFTRIGHT: |
143 | render_samples(both); |
144 | break; |
145 | } |
146 | } |
147 | else |
148 | { |
149 | render_samples(null); |
150 | } |
151 | |
152 | ds->buffer_index = buffer_index; |
153 | ds->fifo_fractional = fp16_16_fractional_part(fifo_fractional); |
154 | |
155 | if(((ds->fifo_top - ds->fifo_base) % 32) <= 16) |
156 | { |
157 | if(dma[1].direct_sound_channel == channel) |
158 | dma_transfer(dma + 1); |
159 | |
160 | if(dma[2].direct_sound_channel == channel) |
161 | dma_transfer(dma + 2); |
162 | } |
163 | } |
164 | |
165 | void sound_reset_fifo(u32 channel) |
166 | { |
167 | direct_sound_struct *ds = direct_sound_channel; |
168 | |
169 | memset(ds->fifo, 0, 32); |
170 | } |
171 | |
172 | // Initial pattern data = 4bits (signed) |
173 | // Channel volume = 12bits |
174 | // Envelope volume = 14bits |
175 | // Master volume = 2bits |
176 | |
177 | // Recalculate left and right volume as volume changes. |
178 | // To calculate the current sample, use (sample * volume) >> 16 |
179 | |
180 | // Square waves range from -8 (low) to 7 (high) |
181 | |
182 | s8 square_pattern_duty[4][8] = |
183 | { |
184 | { 0xF8, 0xF8, 0xF8, 0xF8, 0x07, 0xF8, 0xF8, 0xF8 }, |
185 | { 0xF8, 0xF8, 0xF8, 0xF8, 0x07, 0x07, 0xF8, 0xF8 }, |
186 | { 0xF8, 0xF8, 0x07, 0x07, 0x07, 0x07, 0xF8, 0xF8 }, |
187 | { 0x07, 0x07, 0x07, 0x07, 0xF8, 0xF8, 0x07, 0x07 }, |
188 | }; |
189 | |
190 | s8 wave_samples[64]; |
191 | |
192 | u32 noise_table15[1024]; |
193 | u32 noise_table7[4]; |
194 | |
195 | u32 gbc_sound_master_volume_table[4] = { 1, 2, 4, 0 }; |
196 | |
197 | u32 gbc_sound_channel_volume_table[8] = |
198 | { |
199 | fixed_div(0, 7, 12), |
200 | fixed_div(1, 7, 12), |
201 | fixed_div(2, 7, 12), |
202 | fixed_div(3, 7, 12), |
203 | fixed_div(4, 7, 12), |
204 | fixed_div(5, 7, 12), |
205 | fixed_div(6, 7, 12), |
206 | fixed_div(7, 7, 12) |
207 | }; |
208 | |
209 | u32 gbc_sound_envelope_volume_table[16] = |
210 | { |
211 | fixed_div(0, 15, 14), |
212 | fixed_div(1, 15, 14), |
213 | fixed_div(2, 15, 14), |
214 | fixed_div(3, 15, 14), |
215 | fixed_div(4, 15, 14), |
216 | fixed_div(5, 15, 14), |
217 | fixed_div(6, 15, 14), |
218 | fixed_div(7, 15, 14), |
219 | fixed_div(8, 15, 14), |
220 | fixed_div(9, 15, 14), |
221 | fixed_div(10, 15, 14), |
222 | fixed_div(11, 15, 14), |
223 | fixed_div(12, 15, 14), |
224 | fixed_div(13, 15, 14), |
225 | fixed_div(14, 15, 14), |
226 | fixed_div(15, 15, 14) |
227 | }; |
228 | |
229 | u32 gbc_sound_buffer_index = 0; |
230 | u32 gbc_sound_last_cpu_ticks = 0; |
231 | u32 gbc_sound_partial_ticks = 0; |
232 | |
233 | u32 gbc_sound_master_volume_left; |
234 | u32 gbc_sound_master_volume_right; |
235 | u32 gbc_sound_master_volume; |
236 | |
237 | #define update_volume_channel_envelope(channel) \ |
238 | volume_##channel = gbc_sound_envelope_volume_table[envelope_volume] * \ |
239 | gbc_sound_channel_volume_table[gbc_sound_master_volume_##channel] * \ |
240 | gbc_sound_master_volume_table[gbc_sound_master_volume] \ |
241 | |
242 | #define update_volume_channel_noenvelope(channel) \ |
243 | volume_##channel = gs->wave_volume * \ |
244 | gbc_sound_channel_volume_table[gbc_sound_master_volume_##channel] * \ |
245 | gbc_sound_master_volume_table[gbc_sound_master_volume] \ |
246 | |
247 | #define update_volume(type) \ |
248 | update_volume_channel_##type(left); \ |
249 | update_volume_channel_##type(right) \ |
250 | |
251 | #define update_tone_sweep() \ |
252 | if(gs->sweep_status) \ |
253 | { \ |
254 | u32 sweep_ticks = gs->sweep_ticks - 1; \ |
255 | \ |
256 | if(sweep_ticks == 0) \ |
257 | { \ |
258 | u32 rate = gs->rate; \ |
259 | \ |
260 | if(gs->sweep_direction) \ |
261 | rate = rate - (rate >> gs->sweep_shift); \ |
262 | else \ |
263 | rate = rate + (rate >> gs->sweep_shift); \ |
264 | \ |
265 | if(rate > 2048) \ |
266 | rate = 2048; \ |
267 | \ |
268 | frequency_step = float_to_fp16_16(((131072.0 / (2048 - rate)) * 8.0) / \ |
269 | sound_frequency); \ |
270 | \ |
271 | gs->frequency_step = frequency_step; \ |
272 | gs->rate = rate; \ |
273 | \ |
274 | sweep_ticks = gs->sweep_initial_ticks; \ |
275 | } \ |
276 | gs->sweep_ticks = sweep_ticks; \ |
277 | } \ |
278 | |
279 | #define update_tone_nosweep() \ |
280 | |
281 | #define update_tone_envelope() \ |
282 | if(gs->envelope_status) \ |
283 | { \ |
284 | u32 envelope_ticks = gs->envelope_ticks - 1; \ |
285 | envelope_volume = gs->envelope_volume; \ |
286 | \ |
287 | if(envelope_ticks == 0) \ |
288 | { \ |
289 | if(gs->envelope_direction) \ |
290 | { \ |
291 | if(envelope_volume != 15) \ |
292 | envelope_volume = gs->envelope_volume + 1; \ |
293 | } \ |
294 | else \ |
295 | { \ |
296 | if(envelope_volume != 0) \ |
297 | envelope_volume = gs->envelope_volume - 1; \ |
298 | } \ |
299 | \ |
300 | update_volume(envelope); \ |
301 | \ |
302 | gs->envelope_volume = envelope_volume; \ |
303 | gs->envelope_ticks = gs->envelope_initial_ticks; \ |
304 | } \ |
305 | else \ |
306 | { \ |
307 | gs->envelope_ticks = envelope_ticks; \ |
308 | } \ |
309 | } \ |
310 | |
311 | #define update_tone_noenvelope() \ |
312 | |
313 | #define gbc_sound_synchronize() \ |
314 | while(((gbc_sound_buffer_index - sound_buffer_base) % BUFFER_SIZE) > \ |
315 | (audio_buffer_size * 2)) \ |
316 | { \ |
317 | SDL_CondWait(sound_cv, sound_mutex); \ |
318 | } \ |
319 | |
320 | #define update_tone_counters(envelope_op, sweep_op) \ |
321 | tick_counter += gbc_sound_tick_step; \ |
322 | if(tick_counter > 0xFFFF) \ |
323 | { \ |
324 | if(gs->length_status) \ |
325 | { \ |
326 | u32 length_ticks = gs->length_ticks - 1; \ |
327 | gs->length_ticks = length_ticks; \ |
328 | \ |
329 | if(length_ticks == 0) \ |
330 | { \ |
331 | gs->active_flag = 0; \ |
332 | break; \ |
333 | } \ |
334 | } \ |
335 | \ |
336 | update_tone_##envelope_op(); \ |
337 | update_tone_##sweep_op(); \ |
338 | \ |
339 | tick_counter &= 0xFFFF; \ |
340 | } \ |
341 | |
342 | #define gbc_sound_render_sample_right() \ |
343 | sound_buffer[buffer_index + 1] += (current_sample * volume_right) >> 22 \ |
344 | |
345 | #define gbc_sound_render_sample_left() \ |
346 | sound_buffer[buffer_index] += (current_sample * volume_left) >> 22 \ |
347 | |
348 | #define gbc_sound_render_sample_both() \ |
349 | gbc_sound_render_sample_right(); \ |
350 | gbc_sound_render_sample_left() \ |
351 | |
352 | #define gbc_sound_render_samples(type, sample_length, envelope_op, sweep_op) \ |
353 | for(i = 0; i < buffer_ticks; i++) \ |
354 | { \ |
355 | current_sample = \ |
356 | sample_data[fp16_16_to_u32(sample_index) % sample_length]; \ |
357 | gbc_sound_render_sample_##type(); \ |
358 | \ |
359 | sample_index += frequency_step; \ |
360 | buffer_index = (buffer_index + 2) % BUFFER_SIZE; \ |
361 | \ |
362 | update_tone_counters(envelope_op, sweep_op); \ |
363 | } \ |
364 | |
365 | #define gbc_noise_wrap_full 32767 |
366 | |
367 | #define gbc_noise_wrap_half 126 |
368 | |
369 | #define get_noise_sample_full() \ |
370 | current_sample = \ |
371 | ((s32)(noise_table15[fp16_16_to_u32(sample_index) >> 5] << \ |
372 | (fp16_16_to_u32(sample_index) & 0x1F)) >> 31) & 0x0F \ |
373 | |
374 | #define get_noise_sample_half() \ |
375 | current_sample = \ |
376 | ((s32)(noise_table7[fp16_16_to_u32(sample_index) >> 5] << \ |
377 | (fp16_16_to_u32(sample_index) & 0x1F)) >> 31) & 0x0F \ |
378 | |
379 | #define gbc_sound_render_noise(type, noise_type, envelope_op, sweep_op) \ |
380 | for(i = 0; i < buffer_ticks; i++) \ |
381 | { \ |
382 | get_noise_sample_##noise_type(); \ |
383 | gbc_sound_render_sample_##type(); \ |
384 | \ |
385 | sample_index += frequency_step; \ |
386 | \ |
387 | if(sample_index >= u32_to_fp16_16(gbc_noise_wrap_##noise_type)) \ |
388 | sample_index -= u32_to_fp16_16(gbc_noise_wrap_##noise_type); \ |
389 | \ |
390 | buffer_index = (buffer_index + 2) % BUFFER_SIZE; \ |
391 | update_tone_counters(envelope_op, sweep_op); \ |
392 | } \ |
393 | |
394 | #define gbc_sound_render_channel(type, sample_length, envelope_op, sweep_op) \ |
395 | buffer_index = gbc_sound_buffer_index; \ |
396 | sample_index = gs->sample_index; \ |
397 | frequency_step = gs->frequency_step; \ |
398 | tick_counter = gs->tick_counter; \ |
399 | \ |
400 | update_volume(envelope_op); \ |
401 | \ |
402 | switch(gs->status) \ |
403 | { \ |
404 | case GBC_SOUND_INACTIVE: \ |
405 | break; \ |
406 | \ |
407 | case GBC_SOUND_LEFT: \ |
408 | gbc_sound_render_##type(left, sample_length, envelope_op, sweep_op); \ |
409 | break; \ |
410 | \ |
411 | case GBC_SOUND_RIGHT: \ |
412 | gbc_sound_render_##type(right, sample_length, envelope_op, sweep_op); \ |
413 | break; \ |
414 | \ |
415 | case GBC_SOUND_LEFTRIGHT: \ |
416 | gbc_sound_render_##type(both, sample_length, envelope_op, sweep_op); \ |
417 | break; \ |
418 | } \ |
419 | \ |
420 | gs->sample_index = sample_index; \ |
421 | gs->tick_counter = tick_counter; \ |
422 | |
423 | #define gbc_sound_load_wave_ram(bank) \ |
424 | wave_bank = wave_samples + (bank * 32); \ |
425 | for(i = 0, i2 = 0; i < 16; i++, i2 += 2) \ |
426 | { \ |
427 | current_sample = wave_ram[i]; \ |
428 | wave_bank[i2] = (((current_sample >> 4) & 0x0F) - 8); \ |
429 | wave_bank[i2 + 1] = ((current_sample & 0x0F) - 8); \ |
430 | } \ |
431 | |
432 | void synchronize_sound() |
433 | { |
434 | SDL_LockMutex(sound_mutex); |
435 | |
436 | gbc_sound_synchronize(); |
437 | |
438 | SDL_UnlockMutex(sound_mutex); |
439 | } |
440 | |
441 | void update_gbc_sound(u32 cpu_ticks) |
442 | { |
443 | fixed16_16 buffer_ticks = float_to_fp16_16(((float)(cpu_ticks - |
444 | gbc_sound_last_cpu_ticks) * sound_frequency) / 16777216.0); |
445 | u32 i, i2; |
446 | gbc_sound_struct *gs = gbc_sound_channel; |
447 | fixed16_16 sample_index, frequency_step; |
448 | fixed16_16 tick_counter; |
449 | u32 buffer_index; |
450 | s32 volume_left, volume_right; |
451 | u32 envelope_volume; |
452 | s32 current_sample; |
453 | u32 sound_status = address16(io_registers, 0x84) & 0xFFF0; |
454 | s8 *sample_data; |
455 | s8 *wave_bank; |
456 | u8 *wave_ram = ((u8 *)io_registers) + 0x90; |
457 | |
458 | gbc_sound_partial_ticks += fp16_16_fractional_part(buffer_ticks); |
459 | buffer_ticks = fp16_16_to_u32(buffer_ticks); |
460 | |
461 | if(gbc_sound_partial_ticks > 0xFFFF) |
462 | { |
463 | buffer_ticks += 1; |
464 | gbc_sound_partial_ticks &= 0xFFFF; |
465 | } |
466 | |
467 | SDL_LockMutex(sound_mutex); |
468 | if(synchronize_flag) |
469 | { |
470 | if(((gbc_sound_buffer_index - sound_buffer_base) % BUFFER_SIZE) > |
471 | (audio_buffer_size * 3 / 2)) |
472 | { |
473 | while(((gbc_sound_buffer_index - sound_buffer_base) % BUFFER_SIZE) > |
474 | (audio_buffer_size * 3 / 2)) |
475 | { |
476 | SDL_CondWait(sound_cv, sound_mutex); |
477 | } |
478 | |
479 | #ifdef PSP_BUILD |
480 | if(current_frameskip_type == auto_frameskip) |
481 | { |
482 | sceDisplayWaitVblankStart(); |
483 | real_frame_count = 0; |
484 | virtual_frame_count = 0; |
485 | } |
2455b6a3 |
486 | #else |
2823a4c8 |
487 | if(current_frameskip_type == auto_frameskip) |
488 | { |
2455b6a3 |
489 | /* |
2823a4c8 |
490 | u64 current_ticks; |
491 | u64 next_ticks; |
492 | get_ticks_us(¤t_ticks); |
493 | |
494 | next_ticks = ((current_ticks + 16666) / 16667) * 16667; |
495 | delay_us(next_ticks - current_ticks); |
496 | |
497 | get_ticks_us(&frame_count_initial_timestamp); |
2455b6a3 |
498 | */ |
499 | /* prevent frameskip, or it will cause more audio, |
500 | * then more waiting here, then frame skip again, ... */ |
501 | num_skipped_frames = 100; |
2823a4c8 |
502 | } |
503 | #endif |
504 | |
2823a4c8 |
505 | } |
506 | } |
507 | if(sound_on == 1) |
508 | { |
509 | gs = gbc_sound_channel + 0; |
510 | if(gs->active_flag) |
511 | { |
512 | sound_status |= 0x01; |
513 | sample_data = gs->sample_data; |
514 | envelope_volume = gs->envelope_volume; |
515 | gbc_sound_render_channel(samples, 8, envelope, sweep); |
516 | } |
517 | |
518 | gs = gbc_sound_channel + 1; |
519 | if(gs->active_flag) |
520 | { |
521 | sound_status |= 0x02; |
522 | sample_data = gs->sample_data; |
523 | envelope_volume = gs->envelope_volume; |
524 | gbc_sound_render_channel(samples, 8, envelope, nosweep); |
525 | } |
526 | |
527 | gs = gbc_sound_channel + 2; |
528 | if(gbc_sound_wave_update) |
529 | { |
530 | if(gs->wave_bank == 1) |
531 | { |
532 | gbc_sound_load_wave_ram(1); |
533 | } |
534 | else |
535 | { |
536 | gbc_sound_load_wave_ram(0); |
537 | } |
538 | |
539 | gbc_sound_wave_update = 0; |
540 | } |
541 | |
542 | if((gs->active_flag) && (gs->master_enable)) |
543 | { |
544 | sound_status |= 0x04; |
545 | sample_data = wave_samples; |
546 | if(gs->wave_type == 0) |
547 | { |
548 | if(gs->wave_bank == 1) |
549 | sample_data += 32; |
550 | |
551 | gbc_sound_render_channel(samples, 32, noenvelope, nosweep); |
552 | } |
553 | else |
554 | { |
555 | gbc_sound_render_channel(samples, 64, noenvelope, nosweep); |
556 | } |
557 | } |
558 | |
559 | gs = gbc_sound_channel + 3; |
560 | if(gs->active_flag) |
561 | { |
562 | sound_status |= 0x08; |
563 | envelope_volume = gs->envelope_volume; |
564 | |
565 | if(gs->noise_type == 1) |
566 | { |
567 | gbc_sound_render_channel(noise, half, envelope, nosweep); |
568 | } |
569 | else |
570 | { |
571 | gbc_sound_render_channel(noise, full, envelope, nosweep); |
572 | } |
573 | } |
574 | } |
575 | |
576 | address16(io_registers, 0x84) = sound_status; |
577 | |
2823a4c8 |
578 | gbc_sound_last_cpu_ticks = cpu_ticks; |
579 | gbc_sound_buffer_index = |
580 | (gbc_sound_buffer_index + (buffer_ticks * 2)) % BUFFER_SIZE; |
e9c7b137 |
581 | |
582 | SDL_UnlockMutex(sound_mutex); |
583 | |
584 | SDL_CondSignal(sound_cv); |
2823a4c8 |
585 | } |
586 | |
587 | #define sound_copy_normal() \ |
588 | current_sample = source[i] \ |
589 | |
590 | #define sound_copy(source_offset, length, render_type) \ |
591 | _length = (length) / 2; \ |
592 | source = (s16 *)(sound_buffer + source_offset); \ |
593 | for(i = 0; i < _length; i++) \ |
594 | { \ |
595 | sound_copy_##render_type(); \ |
596 | if(current_sample > 2047) \ |
597 | current_sample = 2047; \ |
598 | if(current_sample < -2048) \ |
599 | current_sample = -2048; \ |
600 | \ |
601 | stream_base[i] = current_sample << 4; \ |
602 | source[i] = 0; \ |
603 | } \ |
604 | |
605 | #define sound_copy_null(source_offset, length) \ |
606 | _length = (length) / 2; \ |
607 | source = (s16 *)(sound_buffer + source_offset); \ |
608 | for(i = 0; i < _length; i++) \ |
609 | { \ |
610 | stream_base[i] = 0; \ |
611 | source[i] = 0; \ |
612 | } \ |
613 | |
614 | |
615 | void sound_callback(void *userdata, Uint8 *stream, int length) |
616 | { |
617 | u32 sample_length = length / 2; |
618 | u32 _length; |
619 | u32 i; |
620 | s16 *stream_base = (s16 *)stream; |
621 | s16 *source; |
622 | s32 current_sample; |
623 | |
624 | SDL_LockMutex(sound_mutex); |
625 | |
626 | while(((gbc_sound_buffer_index - sound_buffer_base) % BUFFER_SIZE) < |
2455b6a3 |
627 | length && !sound_exit_flag) |
2823a4c8 |
628 | { |
629 | SDL_CondWait(sound_cv, sound_mutex); |
630 | } |
631 | |
632 | if(global_enable_audio) |
633 | { |
634 | if((sound_buffer_base + sample_length) >= BUFFER_SIZE) |
635 | { |
636 | u32 partial_length = (BUFFER_SIZE - sound_buffer_base) * 2; |
637 | sound_copy(sound_buffer_base, partial_length, normal); |
638 | source = (s16 *)sound_buffer; |
639 | sound_copy(0, length - partial_length, normal); |
640 | sound_buffer_base = (length - partial_length) / 2; |
641 | } |
642 | else |
643 | { |
644 | sound_copy(sound_buffer_base, length, normal); |
645 | sound_buffer_base += sample_length; |
646 | } |
647 | } |
648 | else |
649 | { |
650 | if((sound_buffer_base + sample_length) >= BUFFER_SIZE) |
651 | { |
652 | u32 partial_length = (BUFFER_SIZE - sound_buffer_base) * 2; |
653 | sound_copy_null(sound_buffer_base, partial_length); |
654 | source = (s16 *)sound_buffer; |
655 | sound_copy(0, length - partial_length, normal); |
656 | sound_buffer_base = (length - partial_length) / 2; |
657 | } |
658 | else |
659 | { |
660 | sound_copy_null(sound_buffer_base, length); |
661 | sound_buffer_base += sample_length; |
662 | } |
663 | } |
664 | |
665 | SDL_CondSignal(sound_cv); |
666 | |
667 | SDL_UnlockMutex(sound_mutex); |
668 | } |
669 | |
670 | // Special thanks to blarrg for the LSFR frequency used in Meridian, as posted |
671 | // on the forum at http://meridian.overclocked.org: |
672 | // http://meridian.overclocked.org/cgi-bin/wwwthreads/showpost.pl?Board=merid |
673 | // angeneraldiscussion&Number=2069&page=0&view=expanded&mode=threaded&sb=4 |
674 | // Hope you don't mind me borrowing it ^_- |
675 | |
676 | void init_noise_table(u32 *table, u32 period, u32 bit_length) |
677 | { |
678 | u32 shift_register = 0xFF; |
679 | u32 mask = ~(1 << bit_length); |
680 | s32 table_pos, bit_pos; |
681 | u32 current_entry; |
682 | u32 table_period = (period + 31) / 32; |
683 | |
684 | // Bits are stored in reverse order so they can be more easily moved to |
685 | // bit 31, for sign extended shift down. |
686 | |
687 | for(table_pos = 0; table_pos < table_period; table_pos++) |
688 | { |
689 | current_entry = 0; |
690 | for(bit_pos = 31; bit_pos >= 0; bit_pos--) |
691 | { |
692 | current_entry |= (shift_register & 0x01) << bit_pos; |
693 | |
694 | shift_register = |
695 | ((1 & (shift_register ^ (shift_register >> 1))) << bit_length) | |
696 | ((shift_register >> 1) & mask); |
697 | } |
698 | |
699 | table[table_pos] = current_entry; |
700 | } |
701 | } |
702 | |
703 | void reset_sound() |
704 | { |
705 | direct_sound_struct *ds = direct_sound_channel; |
706 | gbc_sound_struct *gs = gbc_sound_channel; |
707 | u32 i; |
708 | |
709 | sound_on = 0; |
710 | sound_buffer_base = 0; |
711 | sound_last_cpu_ticks = 0; |
712 | memset(sound_buffer, 0, audio_buffer_size); |
713 | |
714 | for(i = 0; i < 2; i++, ds++) |
715 | { |
716 | ds->buffer_index = 0; |
717 | ds->status = DIRECT_SOUND_INACTIVE; |
718 | ds->fifo_top = 0; |
719 | ds->fifo_base = 0; |
720 | ds->fifo_fractional = 0; |
721 | ds->last_cpu_ticks = 0; |
722 | memset(ds->fifo, 0, 32); |
723 | } |
724 | |
725 | gbc_sound_buffer_index = 0; |
726 | gbc_sound_last_cpu_ticks = 0; |
727 | gbc_sound_partial_ticks = 0; |
728 | |
729 | gbc_sound_master_volume_left = 0; |
730 | gbc_sound_master_volume_right = 0; |
731 | gbc_sound_master_volume = 0; |
732 | memset(wave_samples, 0, 64); |
733 | |
734 | for(i = 0; i < 4; i++, gs++) |
735 | { |
736 | gs->status = GBC_SOUND_INACTIVE; |
737 | gs->sample_data = square_pattern_duty[2]; |
738 | gs->active_flag = 0; |
739 | } |
740 | } |
741 | |
742 | void sound_exit() |
743 | { |
744 | gbc_sound_buffer_index = |
745 | (sound_buffer_base + audio_buffer_size) % BUFFER_SIZE; |
746 | SDL_PauseAudio(1); |
2455b6a3 |
747 | sound_exit_flag = 1; |
2823a4c8 |
748 | SDL_CondSignal(sound_cv); |
2455b6a3 |
749 | SDL_CloseAudio(); |
2823a4c8 |
750 | } |
751 | |
752 | void init_sound() |
753 | { |
754 | #ifdef PSP_BUILD |
755 | audio_buffer_size = (audio_buffer_size_number * 1024) + 3072; |
2455b6a3 |
756 | #else |
2823a4c8 |
757 | audio_buffer_size = 16 << audio_buffer_size_number; |
758 | // audio_buffer_size = 16384; |
2823a4c8 |
759 | #endif |
760 | |
761 | SDL_AudioSpec desired_spec = |
762 | { |
763 | sound_frequency, |
764 | AUDIO_S16, |
765 | 2, |
766 | 0, |
767 | audio_buffer_size / 4, |
768 | 0, |
769 | 0, |
770 | sound_callback, |
771 | NULL |
772 | }; |
773 | |
774 | gbc_sound_tick_step = |
775 | float_to_fp16_16(256.0 / sound_frequency); |
776 | |
777 | init_noise_table(noise_table15, 32767, 14); |
778 | init_noise_table(noise_table7, 127, 6); |
779 | |
780 | reset_sound(); |
781 | |
2823a4c8 |
782 | sound_mutex = SDL_CreateMutex(); |
783 | sound_cv = SDL_CreateCond(); |
2455b6a3 |
784 | |
785 | SDL_OpenAudio(&desired_spec, &sound_settings); |
786 | sound_frequency = sound_settings.freq; |
787 | audio_buffer_size = sound_settings.size; |
788 | u32 i = audio_buffer_size / 16; |
789 | for (audio_buffer_size_number = 0; i && (i & 1) == 0; i >>= 1) |
790 | audio_buffer_size_number++; |
791 | #ifndef PSP_BUILD |
792 | printf("audio: freq %d, size %d\n", sound_frequency, audio_buffer_size); |
793 | #endif |
794 | |
2823a4c8 |
795 | SDL_PauseAudio(0); |
796 | } |
797 | |
798 | #define sound_savestate_builder(type) \ |
799 | void sound_##type##_savestate(file_tag_type savestate_file) \ |
800 | { \ |
801 | file_##type##_variable(savestate_file, sound_on); \ |
802 | file_##type##_variable(savestate_file, sound_buffer_base); \ |
803 | file_##type##_variable(savestate_file, sound_last_cpu_ticks); \ |
804 | file_##type##_variable(savestate_file, gbc_sound_buffer_index); \ |
805 | file_##type##_variable(savestate_file, gbc_sound_last_cpu_ticks); \ |
806 | file_##type##_variable(savestate_file, gbc_sound_partial_ticks); \ |
807 | file_##type##_variable(savestate_file, gbc_sound_master_volume_left); \ |
808 | file_##type##_variable(savestate_file, gbc_sound_master_volume_right); \ |
809 | file_##type##_variable(savestate_file, gbc_sound_master_volume); \ |
810 | file_##type##_array(savestate_file, wave_samples); \ |
811 | file_##type##_array(savestate_file, direct_sound_channel); \ |
812 | file_##type##_array(savestate_file, gbc_sound_channel); \ |
813 | } \ |
814 | |
815 | sound_savestate_builder(read); |
816 | sound_savestate_builder(write_mem); |
817 | |