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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 | |
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28 | u32 sound_frequency = 44100; |
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29 | |
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30 | SDL_mutex *sound_mutex; |
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31 | static SDL_cond *sound_cv; |
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32 | |
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33 | #ifdef PSP_BUILD |
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34 | u32 audio_buffer_size_number = 1; |
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35 | #else |
36 | u32 audio_buffer_size_number = 8; |
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37 | #endif |
38 | |
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39 | u32 sound_on; |
40 | static u32 audio_buffer_size; |
41 | static s16 sound_buffer[BUFFER_SIZE]; |
42 | static u32 sound_buffer_base; |
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43 | |
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44 | static u32 sound_last_cpu_ticks; |
45 | static fixed16_16 gbc_sound_tick_step; |
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46 | |
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47 | static u32 sound_exit_flag; |
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48 | |
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49 | // Queue 1, 2, or 4 samples to the top of the DS FIFO, wrap around circularly |
50 | |
51 | #define sound_timer_queue(size, value) \ |
52 | *((s##size *)(ds->fifo + ds->fifo_top)) = value; \ |
53 | ds->fifo_top = (ds->fifo_top + 1) % 32; \ |
54 | |
55 | void sound_timer_queue8(u32 channel, u8 value) |
56 | { |
57 | direct_sound_struct *ds = direct_sound_channel + channel; |
58 | sound_timer_queue(8, value); |
59 | } |
60 | |
61 | void sound_timer_queue16(u32 channel, u16 value) |
62 | { |
63 | direct_sound_struct *ds = direct_sound_channel + channel; |
64 | sound_timer_queue(8, value & 0xFF); |
65 | sound_timer_queue(8, value >> 8); |
66 | } |
67 | |
68 | void sound_timer_queue32(u32 channel, u32 value) |
69 | { |
70 | direct_sound_struct *ds = direct_sound_channel + channel; |
71 | |
72 | sound_timer_queue(8, value & 0xFF); |
73 | sound_timer_queue(8, (value >> 8) & 0xFF); |
74 | sound_timer_queue(8, (value >> 16) & 0xFF); |
75 | sound_timer_queue(8, value >> 24); |
76 | } |
77 | |
78 | // Unqueue 1 sample from the base of the DS FIFO and place it on the audio |
79 | // buffer for as many samples as necessary. If the DS FIFO is 16 bytes or |
80 | // smaller and if DMA is enabled for the sound channel initiate a DMA transfer |
81 | // to the DS FIFO. |
82 | |
83 | #define render_sample_null() \ |
84 | |
85 | #define render_sample_left() \ |
86 | sound_buffer[buffer_index] += current_sample + \ |
87 | fp16_16_to_u32((next_sample - current_sample) * fifo_fractional) \ |
88 | |
89 | #define render_sample_right() \ |
90 | sound_buffer[buffer_index + 1] += current_sample + \ |
91 | fp16_16_to_u32((next_sample - current_sample) * fifo_fractional) \ |
92 | |
93 | #define render_sample_both() \ |
94 | dest_sample = current_sample + \ |
95 | fp16_16_to_u32((next_sample - current_sample) * fifo_fractional); \ |
96 | sound_buffer[buffer_index] += dest_sample; \ |
97 | sound_buffer[buffer_index + 1] += dest_sample \ |
98 | |
99 | #define render_samples(type) \ |
100 | while(fifo_fractional <= 0xFFFF) \ |
101 | { \ |
102 | render_sample_##type(); \ |
103 | fifo_fractional += frequency_step; \ |
104 | buffer_index = (buffer_index + 2) % BUFFER_SIZE; \ |
105 | } \ |
106 | |
107 | void sound_timer(fixed16_16 frequency_step, u32 channel) |
108 | { |
109 | direct_sound_struct *ds = direct_sound_channel + channel; |
110 | |
111 | fixed16_16 fifo_fractional = ds->fifo_fractional; |
112 | u32 buffer_index = ds->buffer_index; |
113 | s16 current_sample, next_sample, dest_sample; |
114 | |
115 | current_sample = ds->fifo[ds->fifo_base] << 4; |
116 | ds->fifo_base = (ds->fifo_base + 1) % 32; |
117 | next_sample = ds->fifo[ds->fifo_base] << 4; |
118 | |
119 | if(sound_on == 1) |
120 | { |
121 | if(ds->volume == DIRECT_SOUND_VOLUME_50) |
122 | { |
123 | current_sample >>= 1; |
124 | next_sample >>= 1; |
125 | } |
126 | |
127 | switch(ds->status) |
128 | { |
129 | case DIRECT_SOUND_INACTIVE: |
130 | render_samples(null); |
131 | break; |
132 | |
133 | case DIRECT_SOUND_RIGHT: |
134 | render_samples(right); |
135 | break; |
136 | |
137 | case DIRECT_SOUND_LEFT: |
138 | render_samples(left); |
139 | break; |
140 | |
141 | case DIRECT_SOUND_LEFTRIGHT: |
142 | render_samples(both); |
143 | break; |
144 | } |
145 | } |
146 | else |
147 | { |
148 | render_samples(null); |
149 | } |
150 | |
151 | ds->buffer_index = buffer_index; |
152 | ds->fifo_fractional = fp16_16_fractional_part(fifo_fractional); |
153 | |
154 | if(((ds->fifo_top - ds->fifo_base) % 32) <= 16) |
155 | { |
156 | if(dma[1].direct_sound_channel == channel) |
157 | dma_transfer(dma + 1); |
158 | |
159 | if(dma[2].direct_sound_channel == channel) |
160 | dma_transfer(dma + 2); |
161 | } |
162 | } |
163 | |
164 | void sound_reset_fifo(u32 channel) |
165 | { |
166 | direct_sound_struct *ds = direct_sound_channel; |
167 | |
168 | memset(ds->fifo, 0, 32); |
169 | } |
170 | |
171 | // Initial pattern data = 4bits (signed) |
172 | // Channel volume = 12bits |
173 | // Envelope volume = 14bits |
174 | // Master volume = 2bits |
175 | |
176 | // Recalculate left and right volume as volume changes. |
177 | // To calculate the current sample, use (sample * volume) >> 16 |
178 | |
179 | // Square waves range from -8 (low) to 7 (high) |
180 | |
181 | s8 square_pattern_duty[4][8] = |
182 | { |
183 | { 0xF8, 0xF8, 0xF8, 0xF8, 0x07, 0xF8, 0xF8, 0xF8 }, |
184 | { 0xF8, 0xF8, 0xF8, 0xF8, 0x07, 0x07, 0xF8, 0xF8 }, |
185 | { 0xF8, 0xF8, 0x07, 0x07, 0x07, 0x07, 0xF8, 0xF8 }, |
186 | { 0x07, 0x07, 0x07, 0x07, 0xF8, 0xF8, 0x07, 0x07 }, |
187 | }; |
188 | |
189 | s8 wave_samples[64]; |
190 | |
191 | u32 noise_table15[1024]; |
192 | u32 noise_table7[4]; |
193 | |
194 | u32 gbc_sound_master_volume_table[4] = { 1, 2, 4, 0 }; |
195 | |
196 | u32 gbc_sound_channel_volume_table[8] = |
197 | { |
198 | fixed_div(0, 7, 12), |
199 | fixed_div(1, 7, 12), |
200 | fixed_div(2, 7, 12), |
201 | fixed_div(3, 7, 12), |
202 | fixed_div(4, 7, 12), |
203 | fixed_div(5, 7, 12), |
204 | fixed_div(6, 7, 12), |
205 | fixed_div(7, 7, 12) |
206 | }; |
207 | |
208 | u32 gbc_sound_envelope_volume_table[16] = |
209 | { |
210 | fixed_div(0, 15, 14), |
211 | fixed_div(1, 15, 14), |
212 | fixed_div(2, 15, 14), |
213 | fixed_div(3, 15, 14), |
214 | fixed_div(4, 15, 14), |
215 | fixed_div(5, 15, 14), |
216 | fixed_div(6, 15, 14), |
217 | fixed_div(7, 15, 14), |
218 | fixed_div(8, 15, 14), |
219 | fixed_div(9, 15, 14), |
220 | fixed_div(10, 15, 14), |
221 | fixed_div(11, 15, 14), |
222 | fixed_div(12, 15, 14), |
223 | fixed_div(13, 15, 14), |
224 | fixed_div(14, 15, 14), |
225 | fixed_div(15, 15, 14) |
226 | }; |
227 | |
228 | u32 gbc_sound_buffer_index = 0; |
229 | u32 gbc_sound_last_cpu_ticks = 0; |
230 | u32 gbc_sound_partial_ticks = 0; |
231 | |
232 | u32 gbc_sound_master_volume_left; |
233 | u32 gbc_sound_master_volume_right; |
234 | u32 gbc_sound_master_volume; |
235 | |
236 | #define update_volume_channel_envelope(channel) \ |
237 | volume_##channel = gbc_sound_envelope_volume_table[envelope_volume] * \ |
238 | gbc_sound_channel_volume_table[gbc_sound_master_volume_##channel] * \ |
239 | gbc_sound_master_volume_table[gbc_sound_master_volume] \ |
240 | |
241 | #define update_volume_channel_noenvelope(channel) \ |
242 | volume_##channel = gs->wave_volume * \ |
243 | gbc_sound_channel_volume_table[gbc_sound_master_volume_##channel] * \ |
244 | gbc_sound_master_volume_table[gbc_sound_master_volume] \ |
245 | |
246 | #define update_volume(type) \ |
247 | update_volume_channel_##type(left); \ |
248 | update_volume_channel_##type(right) \ |
249 | |
250 | #define update_tone_sweep() \ |
251 | if(gs->sweep_status) \ |
252 | { \ |
253 | u32 sweep_ticks = gs->sweep_ticks - 1; \ |
254 | \ |
255 | if(sweep_ticks == 0) \ |
256 | { \ |
257 | u32 rate = gs->rate; \ |
258 | \ |
259 | if(gs->sweep_direction) \ |
260 | rate = rate - (rate >> gs->sweep_shift); \ |
261 | else \ |
262 | rate = rate + (rate >> gs->sweep_shift); \ |
263 | \ |
264 | if(rate > 2048) \ |
265 | rate = 2048; \ |
266 | \ |
267 | frequency_step = float_to_fp16_16(((131072.0 / (2048 - rate)) * 8.0) / \ |
268 | sound_frequency); \ |
269 | \ |
270 | gs->frequency_step = frequency_step; \ |
271 | gs->rate = rate; \ |
272 | \ |
273 | sweep_ticks = gs->sweep_initial_ticks; \ |
274 | } \ |
275 | gs->sweep_ticks = sweep_ticks; \ |
276 | } \ |
277 | |
278 | #define update_tone_nosweep() \ |
279 | |
280 | #define update_tone_envelope() \ |
281 | if(gs->envelope_status) \ |
282 | { \ |
283 | u32 envelope_ticks = gs->envelope_ticks - 1; \ |
284 | envelope_volume = gs->envelope_volume; \ |
285 | \ |
286 | if(envelope_ticks == 0) \ |
287 | { \ |
288 | if(gs->envelope_direction) \ |
289 | { \ |
290 | if(envelope_volume != 15) \ |
291 | envelope_volume = gs->envelope_volume + 1; \ |
292 | } \ |
293 | else \ |
294 | { \ |
295 | if(envelope_volume != 0) \ |
296 | envelope_volume = gs->envelope_volume - 1; \ |
297 | } \ |
298 | \ |
299 | update_volume(envelope); \ |
300 | \ |
301 | gs->envelope_volume = envelope_volume; \ |
302 | gs->envelope_ticks = gs->envelope_initial_ticks; \ |
303 | } \ |
304 | else \ |
305 | { \ |
306 | gs->envelope_ticks = envelope_ticks; \ |
307 | } \ |
308 | } \ |
309 | |
310 | #define update_tone_noenvelope() \ |
311 | |
312 | #define gbc_sound_synchronize() \ |
313 | while(((gbc_sound_buffer_index - sound_buffer_base) % BUFFER_SIZE) > \ |
314 | (audio_buffer_size * 2)) \ |
315 | { \ |
316 | SDL_CondWait(sound_cv, sound_mutex); \ |
317 | } \ |
318 | |
319 | #define update_tone_counters(envelope_op, sweep_op) \ |
320 | tick_counter += gbc_sound_tick_step; \ |
321 | if(tick_counter > 0xFFFF) \ |
322 | { \ |
323 | if(gs->length_status) \ |
324 | { \ |
325 | u32 length_ticks = gs->length_ticks - 1; \ |
326 | gs->length_ticks = length_ticks; \ |
327 | \ |
328 | if(length_ticks == 0) \ |
329 | { \ |
330 | gs->active_flag = 0; \ |
331 | break; \ |
332 | } \ |
333 | } \ |
334 | \ |
335 | update_tone_##envelope_op(); \ |
336 | update_tone_##sweep_op(); \ |
337 | \ |
338 | tick_counter &= 0xFFFF; \ |
339 | } \ |
340 | |
341 | #define gbc_sound_render_sample_right() \ |
342 | sound_buffer[buffer_index + 1] += (current_sample * volume_right) >> 22 \ |
343 | |
344 | #define gbc_sound_render_sample_left() \ |
345 | sound_buffer[buffer_index] += (current_sample * volume_left) >> 22 \ |
346 | |
347 | #define gbc_sound_render_sample_both() \ |
348 | gbc_sound_render_sample_right(); \ |
349 | gbc_sound_render_sample_left() \ |
350 | |
351 | #define gbc_sound_render_samples(type, sample_length, envelope_op, sweep_op) \ |
352 | for(i = 0; i < buffer_ticks; i++) \ |
353 | { \ |
354 | current_sample = \ |
355 | sample_data[fp16_16_to_u32(sample_index) % sample_length]; \ |
356 | gbc_sound_render_sample_##type(); \ |
357 | \ |
358 | sample_index += frequency_step; \ |
359 | buffer_index = (buffer_index + 2) % BUFFER_SIZE; \ |
360 | \ |
361 | update_tone_counters(envelope_op, sweep_op); \ |
362 | } \ |
363 | |
364 | #define gbc_noise_wrap_full 32767 |
365 | |
366 | #define gbc_noise_wrap_half 126 |
367 | |
368 | #define get_noise_sample_full() \ |
369 | current_sample = \ |
370 | ((s32)(noise_table15[fp16_16_to_u32(sample_index) >> 5] << \ |
371 | (fp16_16_to_u32(sample_index) & 0x1F)) >> 31) & 0x0F \ |
372 | |
373 | #define get_noise_sample_half() \ |
374 | current_sample = \ |
375 | ((s32)(noise_table7[fp16_16_to_u32(sample_index) >> 5] << \ |
376 | (fp16_16_to_u32(sample_index) & 0x1F)) >> 31) & 0x0F \ |
377 | |
378 | #define gbc_sound_render_noise(type, noise_type, envelope_op, sweep_op) \ |
379 | for(i = 0; i < buffer_ticks; i++) \ |
380 | { \ |
381 | get_noise_sample_##noise_type(); \ |
382 | gbc_sound_render_sample_##type(); \ |
383 | \ |
384 | sample_index += frequency_step; \ |
385 | \ |
386 | if(sample_index >= u32_to_fp16_16(gbc_noise_wrap_##noise_type)) \ |
387 | sample_index -= u32_to_fp16_16(gbc_noise_wrap_##noise_type); \ |
388 | \ |
389 | buffer_index = (buffer_index + 2) % BUFFER_SIZE; \ |
390 | update_tone_counters(envelope_op, sweep_op); \ |
391 | } \ |
392 | |
393 | #define gbc_sound_render_channel(type, sample_length, envelope_op, sweep_op) \ |
394 | buffer_index = gbc_sound_buffer_index; \ |
395 | sample_index = gs->sample_index; \ |
396 | frequency_step = gs->frequency_step; \ |
397 | tick_counter = gs->tick_counter; \ |
398 | \ |
399 | update_volume(envelope_op); \ |
400 | \ |
401 | switch(gs->status) \ |
402 | { \ |
403 | case GBC_SOUND_INACTIVE: \ |
404 | break; \ |
405 | \ |
406 | case GBC_SOUND_LEFT: \ |
407 | gbc_sound_render_##type(left, sample_length, envelope_op, sweep_op); \ |
408 | break; \ |
409 | \ |
410 | case GBC_SOUND_RIGHT: \ |
411 | gbc_sound_render_##type(right, sample_length, envelope_op, sweep_op); \ |
412 | break; \ |
413 | \ |
414 | case GBC_SOUND_LEFTRIGHT: \ |
415 | gbc_sound_render_##type(both, sample_length, envelope_op, sweep_op); \ |
416 | break; \ |
417 | } \ |
418 | \ |
419 | gs->sample_index = sample_index; \ |
420 | gs->tick_counter = tick_counter; \ |
421 | |
422 | #define gbc_sound_load_wave_ram(bank) \ |
423 | wave_bank = wave_samples + (bank * 32); \ |
424 | for(i = 0, i2 = 0; i < 16; i++, i2 += 2) \ |
425 | { \ |
426 | current_sample = wave_ram[i]; \ |
427 | wave_bank[i2] = (((current_sample >> 4) & 0x0F) - 8); \ |
428 | wave_bank[i2 + 1] = ((current_sample & 0x0F) - 8); \ |
429 | } \ |
430 | |
431 | void synchronize_sound() |
432 | { |
433 | SDL_LockMutex(sound_mutex); |
434 | |
435 | gbc_sound_synchronize(); |
436 | |
437 | SDL_UnlockMutex(sound_mutex); |
438 | } |
439 | |
440 | void update_gbc_sound(u32 cpu_ticks) |
441 | { |
442 | fixed16_16 buffer_ticks = float_to_fp16_16(((float)(cpu_ticks - |
443 | gbc_sound_last_cpu_ticks) * sound_frequency) / 16777216.0); |
444 | u32 i, i2; |
445 | gbc_sound_struct *gs = gbc_sound_channel; |
446 | fixed16_16 sample_index, frequency_step; |
447 | fixed16_16 tick_counter; |
448 | u32 buffer_index; |
449 | s32 volume_left, volume_right; |
450 | u32 envelope_volume; |
451 | s32 current_sample; |
452 | u32 sound_status = address16(io_registers, 0x84) & 0xFFF0; |
453 | s8 *sample_data; |
454 | s8 *wave_bank; |
455 | u8 *wave_ram = ((u8 *)io_registers) + 0x90; |
456 | |
457 | gbc_sound_partial_ticks += fp16_16_fractional_part(buffer_ticks); |
458 | buffer_ticks = fp16_16_to_u32(buffer_ticks); |
459 | |
460 | if(gbc_sound_partial_ticks > 0xFFFF) |
461 | { |
462 | buffer_ticks += 1; |
463 | gbc_sound_partial_ticks &= 0xFFFF; |
464 | } |
465 | |
466 | SDL_LockMutex(sound_mutex); |
467 | if(synchronize_flag) |
468 | { |
469 | if(((gbc_sound_buffer_index - sound_buffer_base) % BUFFER_SIZE) > |
470 | (audio_buffer_size * 3 / 2)) |
471 | { |
472 | while(((gbc_sound_buffer_index - sound_buffer_base) % BUFFER_SIZE) > |
473 | (audio_buffer_size * 3 / 2)) |
474 | { |
475 | SDL_CondWait(sound_cv, sound_mutex); |
476 | } |
477 | |
478 | #ifdef PSP_BUILD |
479 | if(current_frameskip_type == auto_frameskip) |
480 | { |
481 | sceDisplayWaitVblankStart(); |
482 | real_frame_count = 0; |
483 | virtual_frame_count = 0; |
484 | } |
2455b6a3 |
485 | #else |
2823a4c8 |
486 | if(current_frameskip_type == auto_frameskip) |
487 | { |
2455b6a3 |
488 | /* |
2823a4c8 |
489 | u64 current_ticks; |
490 | u64 next_ticks; |
491 | get_ticks_us(¤t_ticks); |
492 | |
493 | next_ticks = ((current_ticks + 16666) / 16667) * 16667; |
494 | delay_us(next_ticks - current_ticks); |
495 | |
496 | get_ticks_us(&frame_count_initial_timestamp); |
2455b6a3 |
497 | */ |
498 | /* prevent frameskip, or it will cause more audio, |
499 | * then more waiting here, then frame skip again, ... */ |
500 | num_skipped_frames = 100; |
2823a4c8 |
501 | } |
502 | #endif |
503 | |
2823a4c8 |
504 | } |
505 | } |
506 | if(sound_on == 1) |
507 | { |
508 | gs = gbc_sound_channel + 0; |
509 | if(gs->active_flag) |
510 | { |
511 | sound_status |= 0x01; |
512 | sample_data = gs->sample_data; |
513 | envelope_volume = gs->envelope_volume; |
514 | gbc_sound_render_channel(samples, 8, envelope, sweep); |
515 | } |
516 | |
517 | gs = gbc_sound_channel + 1; |
518 | if(gs->active_flag) |
519 | { |
520 | sound_status |= 0x02; |
521 | sample_data = gs->sample_data; |
522 | envelope_volume = gs->envelope_volume; |
523 | gbc_sound_render_channel(samples, 8, envelope, nosweep); |
524 | } |
525 | |
526 | gs = gbc_sound_channel + 2; |
527 | if(gbc_sound_wave_update) |
528 | { |
529 | if(gs->wave_bank == 1) |
530 | { |
531 | gbc_sound_load_wave_ram(1); |
532 | } |
533 | else |
534 | { |
535 | gbc_sound_load_wave_ram(0); |
536 | } |
537 | |
538 | gbc_sound_wave_update = 0; |
539 | } |
540 | |
541 | if((gs->active_flag) && (gs->master_enable)) |
542 | { |
543 | sound_status |= 0x04; |
544 | sample_data = wave_samples; |
545 | if(gs->wave_type == 0) |
546 | { |
547 | if(gs->wave_bank == 1) |
548 | sample_data += 32; |
549 | |
550 | gbc_sound_render_channel(samples, 32, noenvelope, nosweep); |
551 | } |
552 | else |
553 | { |
554 | gbc_sound_render_channel(samples, 64, noenvelope, nosweep); |
555 | } |
556 | } |
557 | |
558 | gs = gbc_sound_channel + 3; |
559 | if(gs->active_flag) |
560 | { |
561 | sound_status |= 0x08; |
562 | envelope_volume = gs->envelope_volume; |
563 | |
564 | if(gs->noise_type == 1) |
565 | { |
566 | gbc_sound_render_channel(noise, half, envelope, nosweep); |
567 | } |
568 | else |
569 | { |
570 | gbc_sound_render_channel(noise, full, envelope, nosweep); |
571 | } |
572 | } |
573 | } |
574 | |
575 | address16(io_registers, 0x84) = sound_status; |
576 | |
2823a4c8 |
577 | gbc_sound_last_cpu_ticks = cpu_ticks; |
578 | gbc_sound_buffer_index = |
579 | (gbc_sound_buffer_index + (buffer_ticks * 2)) % BUFFER_SIZE; |
e9c7b137 |
580 | |
581 | SDL_UnlockMutex(sound_mutex); |
582 | |
583 | SDL_CondSignal(sound_cv); |
2823a4c8 |
584 | } |
585 | |
586 | #define sound_copy_normal() \ |
587 | current_sample = source[i] \ |
588 | |
589 | #define sound_copy(source_offset, length, render_type) \ |
590 | _length = (length) / 2; \ |
591 | source = (s16 *)(sound_buffer + source_offset); \ |
592 | for(i = 0; i < _length; i++) \ |
593 | { \ |
594 | sound_copy_##render_type(); \ |
595 | if(current_sample > 2047) \ |
596 | current_sample = 2047; \ |
597 | if(current_sample < -2048) \ |
598 | current_sample = -2048; \ |
599 | \ |
600 | stream_base[i] = current_sample << 4; \ |
601 | source[i] = 0; \ |
602 | } \ |
603 | |
604 | #define sound_copy_null(source_offset, length) \ |
605 | _length = (length) / 2; \ |
606 | source = (s16 *)(sound_buffer + source_offset); \ |
607 | for(i = 0; i < _length; i++) \ |
608 | { \ |
609 | stream_base[i] = 0; \ |
610 | source[i] = 0; \ |
611 | } \ |
612 | |
613 | |
614 | void sound_callback(void *userdata, Uint8 *stream, int length) |
615 | { |
616 | u32 sample_length = length / 2; |
617 | u32 _length; |
618 | u32 i; |
619 | s16 *stream_base = (s16 *)stream; |
620 | s16 *source; |
621 | s32 current_sample; |
622 | |
623 | SDL_LockMutex(sound_mutex); |
624 | |
625 | while(((gbc_sound_buffer_index - sound_buffer_base) % BUFFER_SIZE) < |
2455b6a3 |
626 | length && !sound_exit_flag) |
2823a4c8 |
627 | { |
628 | SDL_CondWait(sound_cv, sound_mutex); |
629 | } |
630 | |
631 | if(global_enable_audio) |
632 | { |
633 | if((sound_buffer_base + sample_length) >= BUFFER_SIZE) |
634 | { |
635 | u32 partial_length = (BUFFER_SIZE - sound_buffer_base) * 2; |
636 | sound_copy(sound_buffer_base, partial_length, normal); |
637 | source = (s16 *)sound_buffer; |
638 | sound_copy(0, length - partial_length, normal); |
639 | sound_buffer_base = (length - partial_length) / 2; |
640 | } |
641 | else |
642 | { |
643 | sound_copy(sound_buffer_base, length, normal); |
644 | sound_buffer_base += sample_length; |
645 | } |
646 | } |
647 | else |
648 | { |
649 | if((sound_buffer_base + sample_length) >= BUFFER_SIZE) |
650 | { |
651 | u32 partial_length = (BUFFER_SIZE - sound_buffer_base) * 2; |
652 | sound_copy_null(sound_buffer_base, partial_length); |
653 | source = (s16 *)sound_buffer; |
654 | sound_copy(0, length - partial_length, normal); |
655 | sound_buffer_base = (length - partial_length) / 2; |
656 | } |
657 | else |
658 | { |
659 | sound_copy_null(sound_buffer_base, length); |
660 | sound_buffer_base += sample_length; |
661 | } |
662 | } |
663 | |
664 | SDL_CondSignal(sound_cv); |
665 | |
666 | SDL_UnlockMutex(sound_mutex); |
667 | } |
668 | |
669 | // Special thanks to blarrg for the LSFR frequency used in Meridian, as posted |
670 | // on the forum at http://meridian.overclocked.org: |
671 | // http://meridian.overclocked.org/cgi-bin/wwwthreads/showpost.pl?Board=merid |
672 | // angeneraldiscussion&Number=2069&page=0&view=expanded&mode=threaded&sb=4 |
673 | // Hope you don't mind me borrowing it ^_- |
674 | |
675 | void init_noise_table(u32 *table, u32 period, u32 bit_length) |
676 | { |
677 | u32 shift_register = 0xFF; |
678 | u32 mask = ~(1 << bit_length); |
679 | s32 table_pos, bit_pos; |
680 | u32 current_entry; |
681 | u32 table_period = (period + 31) / 32; |
682 | |
683 | // Bits are stored in reverse order so they can be more easily moved to |
684 | // bit 31, for sign extended shift down. |
685 | |
686 | for(table_pos = 0; table_pos < table_period; table_pos++) |
687 | { |
688 | current_entry = 0; |
689 | for(bit_pos = 31; bit_pos >= 0; bit_pos--) |
690 | { |
691 | current_entry |= (shift_register & 0x01) << bit_pos; |
692 | |
693 | shift_register = |
694 | ((1 & (shift_register ^ (shift_register >> 1))) << bit_length) | |
695 | ((shift_register >> 1) & mask); |
696 | } |
697 | |
698 | table[table_pos] = current_entry; |
699 | } |
700 | } |
701 | |
702 | void reset_sound() |
703 | { |
704 | direct_sound_struct *ds = direct_sound_channel; |
705 | gbc_sound_struct *gs = gbc_sound_channel; |
706 | u32 i; |
707 | |
708 | sound_on = 0; |
709 | sound_buffer_base = 0; |
710 | sound_last_cpu_ticks = 0; |
711 | memset(sound_buffer, 0, audio_buffer_size); |
712 | |
713 | for(i = 0; i < 2; i++, ds++) |
714 | { |
715 | ds->buffer_index = 0; |
716 | ds->status = DIRECT_SOUND_INACTIVE; |
717 | ds->fifo_top = 0; |
718 | ds->fifo_base = 0; |
719 | ds->fifo_fractional = 0; |
720 | ds->last_cpu_ticks = 0; |
721 | memset(ds->fifo, 0, 32); |
722 | } |
723 | |
724 | gbc_sound_buffer_index = 0; |
725 | gbc_sound_last_cpu_ticks = 0; |
726 | gbc_sound_partial_ticks = 0; |
727 | |
728 | gbc_sound_master_volume_left = 0; |
729 | gbc_sound_master_volume_right = 0; |
730 | gbc_sound_master_volume = 0; |
731 | memset(wave_samples, 0, 64); |
732 | |
733 | for(i = 0; i < 4; i++, gs++) |
734 | { |
735 | gs->status = GBC_SOUND_INACTIVE; |
736 | gs->sample_data = square_pattern_duty[2]; |
737 | gs->active_flag = 0; |
738 | } |
739 | } |
740 | |
741 | void sound_exit() |
742 | { |
743 | gbc_sound_buffer_index = |
744 | (sound_buffer_base + audio_buffer_size) % BUFFER_SIZE; |
745 | SDL_PauseAudio(1); |
2455b6a3 |
746 | sound_exit_flag = 1; |
2823a4c8 |
747 | SDL_CondSignal(sound_cv); |
2455b6a3 |
748 | SDL_CloseAudio(); |
2823a4c8 |
749 | } |
750 | |
751 | void init_sound() |
752 | { |
bbba3209 |
753 | SDL_AudioSpec sound_settings; |
754 | |
2823a4c8 |
755 | #ifdef PSP_BUILD |
756 | audio_buffer_size = (audio_buffer_size_number * 1024) + 3072; |
2455b6a3 |
757 | #else |
2823a4c8 |
758 | audio_buffer_size = 16 << audio_buffer_size_number; |
759 | // audio_buffer_size = 16384; |
2823a4c8 |
760 | #endif |
761 | |
762 | SDL_AudioSpec desired_spec = |
763 | { |
764 | sound_frequency, |
765 | AUDIO_S16, |
766 | 2, |
767 | 0, |
768 | audio_buffer_size / 4, |
769 | 0, |
770 | 0, |
771 | sound_callback, |
772 | NULL |
773 | }; |
774 | |
775 | gbc_sound_tick_step = |
776 | float_to_fp16_16(256.0 / sound_frequency); |
777 | |
778 | init_noise_table(noise_table15, 32767, 14); |
779 | init_noise_table(noise_table7, 127, 6); |
780 | |
781 | reset_sound(); |
782 | |
2823a4c8 |
783 | sound_mutex = SDL_CreateMutex(); |
784 | sound_cv = SDL_CreateCond(); |
2455b6a3 |
785 | |
786 | SDL_OpenAudio(&desired_spec, &sound_settings); |
787 | sound_frequency = sound_settings.freq; |
788 | audio_buffer_size = sound_settings.size; |
789 | u32 i = audio_buffer_size / 16; |
790 | for (audio_buffer_size_number = 0; i && (i & 1) == 0; i >>= 1) |
791 | audio_buffer_size_number++; |
792 | #ifndef PSP_BUILD |
793 | printf("audio: freq %d, size %d\n", sound_frequency, audio_buffer_size); |
794 | #endif |
795 | |
2823a4c8 |
796 | SDL_PauseAudio(0); |
797 | } |
798 | |
799 | #define sound_savestate_builder(type) \ |
800 | void sound_##type##_savestate(file_tag_type savestate_file) \ |
801 | { \ |
802 | file_##type##_variable(savestate_file, sound_on); \ |
803 | file_##type##_variable(savestate_file, sound_buffer_base); \ |
804 | file_##type##_variable(savestate_file, sound_last_cpu_ticks); \ |
805 | file_##type##_variable(savestate_file, gbc_sound_buffer_index); \ |
806 | file_##type##_variable(savestate_file, gbc_sound_last_cpu_ticks); \ |
807 | file_##type##_variable(savestate_file, gbc_sound_partial_ticks); \ |
808 | file_##type##_variable(savestate_file, gbc_sound_master_volume_left); \ |
809 | file_##type##_variable(savestate_file, gbc_sound_master_volume_right); \ |
810 | file_##type##_variable(savestate_file, gbc_sound_master_volume); \ |
811 | file_##type##_array(savestate_file, wave_samples); \ |
812 | file_##type##_array(savestate_file, direct_sound_channel); \ |
813 | file_##type##_array(savestate_file, gbc_sound_channel); \ |
814 | } \ |
815 | |
816 | sound_savestate_builder(read); |
817 | sound_savestate_builder(write_mem); |
818 | |