| 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 | u32 sound_frequency = 44100; |
| 29 | |
| 30 | SDL_mutex *sound_mutex; |
| 31 | static SDL_cond *sound_cv; |
| 32 | |
| 33 | #ifdef PSP_BUILD |
| 34 | u32 audio_buffer_size_number = 1; |
| 35 | #elif defined(POLLUX_BUILD) |
| 36 | u32 audio_buffer_size_number = 7; |
| 37 | #else |
| 38 | u32 audio_buffer_size_number = 8; |
| 39 | #endif |
| 40 | |
| 41 | u32 sound_on; |
| 42 | static u32 audio_buffer_size; |
| 43 | static s16 sound_buffer[BUFFER_SIZE]; |
| 44 | static u32 sound_buffer_base; |
| 45 | |
| 46 | static u32 sound_last_cpu_ticks; |
| 47 | static fixed16_16 gbc_sound_tick_step; |
| 48 | |
| 49 | static u32 sound_exit_flag; |
| 50 | |
| 51 | // Queue 1, 2, or 4 samples to the top of the DS FIFO, wrap around circularly |
| 52 | |
| 53 | #define sound_timer_queue(size, value) \ |
| 54 | *((s##size *)(ds->fifo + ds->fifo_top)) = value; \ |
| 55 | ds->fifo_top = (ds->fifo_top + 1) % 32; \ |
| 56 | |
| 57 | void sound_timer_queue8(u32 channel, u8 value) |
| 58 | { |
| 59 | direct_sound_struct *ds = direct_sound_channel + channel; |
| 60 | sound_timer_queue(8, value); |
| 61 | } |
| 62 | |
| 63 | void sound_timer_queue16(u32 channel, u16 value) |
| 64 | { |
| 65 | direct_sound_struct *ds = direct_sound_channel + channel; |
| 66 | sound_timer_queue(8, value & 0xFF); |
| 67 | sound_timer_queue(8, value >> 8); |
| 68 | } |
| 69 | |
| 70 | void sound_timer_queue32(u32 channel, u32 value) |
| 71 | { |
| 72 | direct_sound_struct *ds = direct_sound_channel + channel; |
| 73 | |
| 74 | sound_timer_queue(8, value & 0xFF); |
| 75 | sound_timer_queue(8, (value >> 8) & 0xFF); |
| 76 | sound_timer_queue(8, (value >> 16) & 0xFF); |
| 77 | sound_timer_queue(8, value >> 24); |
| 78 | } |
| 79 | |
| 80 | // Unqueue 1 sample from the base of the DS FIFO and place it on the audio |
| 81 | // buffer for as many samples as necessary. If the DS FIFO is 16 bytes or |
| 82 | // smaller and if DMA is enabled for the sound channel initiate a DMA transfer |
| 83 | // to the DS FIFO. |
| 84 | |
| 85 | #define render_sample_null() \ |
| 86 | |
| 87 | #define render_sample_left() \ |
| 88 | sound_buffer[buffer_index] += current_sample + \ |
| 89 | fp16_16_to_u32((next_sample - current_sample) * (fifo_fractional >> 8)) \ |
| 90 | |
| 91 | #define render_sample_right() \ |
| 92 | sound_buffer[buffer_index + 1] += current_sample + \ |
| 93 | fp16_16_to_u32((next_sample - current_sample) * (fifo_fractional >> 8)) \ |
| 94 | |
| 95 | #define render_sample_both() \ |
| 96 | dest_sample = current_sample + \ |
| 97 | fp16_16_to_u32((next_sample - current_sample) * (fifo_fractional >> 8)); \ |
| 98 | sound_buffer[buffer_index] += dest_sample; \ |
| 99 | sound_buffer[buffer_index + 1] += dest_sample \ |
| 100 | |
| 101 | #define render_samples(type) \ |
| 102 | while(fifo_fractional <= 0xFFFFFF) \ |
| 103 | { \ |
| 104 | render_sample_##type(); \ |
| 105 | fifo_fractional += frequency_step; \ |
| 106 | buffer_index = (buffer_index + 2) % BUFFER_SIZE; \ |
| 107 | } \ |
| 108 | |
| 109 | void sound_timer(fixed8_24 frequency_step, u32 channel) |
| 110 | { |
| 111 | direct_sound_struct *ds = direct_sound_channel + channel; |
| 112 | |
| 113 | fixed8_24 fifo_fractional = ds->fifo_fractional; |
| 114 | u32 buffer_index = ds->buffer_index; |
| 115 | s16 current_sample, next_sample, dest_sample; |
| 116 | |
| 117 | current_sample = ds->fifo[ds->fifo_base] << 4; |
| 118 | ds->fifo_base = (ds->fifo_base + 1) % 32; |
| 119 | next_sample = ds->fifo[ds->fifo_base] << 4; |
| 120 | |
| 121 | if(sound_on == 1) |
| 122 | { |
| 123 | if(ds->volume == DIRECT_SOUND_VOLUME_50) |
| 124 | { |
| 125 | current_sample >>= 1; |
| 126 | next_sample >>= 1; |
| 127 | } |
| 128 | |
| 129 | switch(ds->status) |
| 130 | { |
| 131 | case DIRECT_SOUND_INACTIVE: |
| 132 | render_samples(null); |
| 133 | break; |
| 134 | |
| 135 | case DIRECT_SOUND_RIGHT: |
| 136 | render_samples(right); |
| 137 | break; |
| 138 | |
| 139 | case DIRECT_SOUND_LEFT: |
| 140 | render_samples(left); |
| 141 | break; |
| 142 | |
| 143 | case DIRECT_SOUND_LEFTRIGHT: |
| 144 | render_samples(both); |
| 145 | break; |
| 146 | } |
| 147 | } |
| 148 | else |
| 149 | { |
| 150 | render_samples(null); |
| 151 | } |
| 152 | |
| 153 | ds->buffer_index = buffer_index; |
| 154 | ds->fifo_fractional = fp8_24_fractional_part(fifo_fractional); |
| 155 | |
| 156 | if(((ds->fifo_top - ds->fifo_base) % 32) <= 16) |
| 157 | { |
| 158 | if(dma[1].direct_sound_channel == channel) |
| 159 | dma_transfer(dma + 1); |
| 160 | |
| 161 | if(dma[2].direct_sound_channel == channel) |
| 162 | dma_transfer(dma + 2); |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | void sound_reset_fifo(u32 channel) |
| 167 | { |
| 168 | direct_sound_struct *ds = direct_sound_channel; |
| 169 | |
| 170 | memset(ds->fifo, 0, 32); |
| 171 | } |
| 172 | |
| 173 | // Initial pattern data = 4bits (signed) |
| 174 | // Channel volume = 12bits |
| 175 | // Envelope volume = 14bits |
| 176 | // Master volume = 2bits |
| 177 | |
| 178 | // Recalculate left and right volume as volume changes. |
| 179 | // To calculate the current sample, use (sample * volume) >> 16 |
| 180 | |
| 181 | // Square waves range from -8 (low) to 7 (high) |
| 182 | |
| 183 | s8 square_pattern_duty[4][8] = |
| 184 | { |
| 185 | { 0xF8, 0xF8, 0xF8, 0xF8, 0x07, 0xF8, 0xF8, 0xF8 }, |
| 186 | { 0xF8, 0xF8, 0xF8, 0xF8, 0x07, 0x07, 0xF8, 0xF8 }, |
| 187 | { 0xF8, 0xF8, 0x07, 0x07, 0x07, 0x07, 0xF8, 0xF8 }, |
| 188 | { 0x07, 0x07, 0x07, 0x07, 0xF8, 0xF8, 0x07, 0x07 }, |
| 189 | }; |
| 190 | |
| 191 | s8 wave_samples[64]; |
| 192 | |
| 193 | u32 noise_table15[1024]; |
| 194 | u32 noise_table7[4]; |
| 195 | |
| 196 | u32 gbc_sound_master_volume_table[4] = { 1, 2, 4, 0 }; |
| 197 | |
| 198 | u32 gbc_sound_channel_volume_table[8] = |
| 199 | { |
| 200 | fixed_div(0, 7, 12), |
| 201 | fixed_div(1, 7, 12), |
| 202 | fixed_div(2, 7, 12), |
| 203 | fixed_div(3, 7, 12), |
| 204 | fixed_div(4, 7, 12), |
| 205 | fixed_div(5, 7, 12), |
| 206 | fixed_div(6, 7, 12), |
| 207 | fixed_div(7, 7, 12) |
| 208 | }; |
| 209 | |
| 210 | u32 gbc_sound_envelope_volume_table[16] = |
| 211 | { |
| 212 | fixed_div(0, 15, 14), |
| 213 | fixed_div(1, 15, 14), |
| 214 | fixed_div(2, 15, 14), |
| 215 | fixed_div(3, 15, 14), |
| 216 | fixed_div(4, 15, 14), |
| 217 | fixed_div(5, 15, 14), |
| 218 | fixed_div(6, 15, 14), |
| 219 | fixed_div(7, 15, 14), |
| 220 | fixed_div(8, 15, 14), |
| 221 | fixed_div(9, 15, 14), |
| 222 | fixed_div(10, 15, 14), |
| 223 | fixed_div(11, 15, 14), |
| 224 | fixed_div(12, 15, 14), |
| 225 | fixed_div(13, 15, 14), |
| 226 | fixed_div(14, 15, 14), |
| 227 | fixed_div(15, 15, 14) |
| 228 | }; |
| 229 | |
| 230 | u32 gbc_sound_buffer_index = 0; |
| 231 | u32 gbc_sound_last_cpu_ticks = 0; |
| 232 | u32 gbc_sound_partial_ticks = 0; |
| 233 | |
| 234 | u32 gbc_sound_master_volume_left; |
| 235 | u32 gbc_sound_master_volume_right; |
| 236 | u32 gbc_sound_master_volume; |
| 237 | |
| 238 | #define update_volume_channel_envelope(channel) \ |
| 239 | volume_##channel = gbc_sound_envelope_volume_table[envelope_volume] * \ |
| 240 | gbc_sound_channel_volume_table[gbc_sound_master_volume_##channel] * \ |
| 241 | gbc_sound_master_volume_table[gbc_sound_master_volume] \ |
| 242 | |
| 243 | #define update_volume_channel_noenvelope(channel) \ |
| 244 | volume_##channel = gs->wave_volume * \ |
| 245 | gbc_sound_channel_volume_table[gbc_sound_master_volume_##channel] * \ |
| 246 | gbc_sound_master_volume_table[gbc_sound_master_volume] \ |
| 247 | |
| 248 | #define update_volume(type) \ |
| 249 | update_volume_channel_##type(left); \ |
| 250 | update_volume_channel_##type(right) \ |
| 251 | |
| 252 | #define update_tone_sweep() \ |
| 253 | if(gs->sweep_status) \ |
| 254 | { \ |
| 255 | u32 sweep_ticks = gs->sweep_ticks - 1; \ |
| 256 | \ |
| 257 | if(sweep_ticks == 0) \ |
| 258 | { \ |
| 259 | u32 rate = gs->rate; \ |
| 260 | \ |
| 261 | if(gs->sweep_direction) \ |
| 262 | rate = rate - (rate >> gs->sweep_shift); \ |
| 263 | else \ |
| 264 | rate = rate + (rate >> gs->sweep_shift); \ |
| 265 | \ |
| 266 | if(rate > 2048) \ |
| 267 | rate = 2048; \ |
| 268 | \ |
| 269 | frequency_step = float_to_fp16_16(((131072.0f / (2048 - rate)) * 8.0f) \ |
| 270 | / sound_frequency); \ |
| 271 | \ |
| 272 | gs->frequency_step = frequency_step; \ |
| 273 | gs->rate = rate; \ |
| 274 | \ |
| 275 | sweep_ticks = gs->sweep_initial_ticks; \ |
| 276 | } \ |
| 277 | gs->sweep_ticks = sweep_ticks; \ |
| 278 | } \ |
| 279 | |
| 280 | #define update_tone_nosweep() \ |
| 281 | |
| 282 | #define update_tone_envelope() \ |
| 283 | if(gs->envelope_status) \ |
| 284 | { \ |
| 285 | u32 envelope_ticks = gs->envelope_ticks - 1; \ |
| 286 | envelope_volume = gs->envelope_volume; \ |
| 287 | \ |
| 288 | if(envelope_ticks == 0) \ |
| 289 | { \ |
| 290 | if(gs->envelope_direction) \ |
| 291 | { \ |
| 292 | if(envelope_volume != 15) \ |
| 293 | envelope_volume = gs->envelope_volume + 1; \ |
| 294 | } \ |
| 295 | else \ |
| 296 | { \ |
| 297 | if(envelope_volume != 0) \ |
| 298 | envelope_volume = gs->envelope_volume - 1; \ |
| 299 | } \ |
| 300 | \ |
| 301 | update_volume(envelope); \ |
| 302 | \ |
| 303 | gs->envelope_volume = envelope_volume; \ |
| 304 | gs->envelope_ticks = gs->envelope_initial_ticks; \ |
| 305 | } \ |
| 306 | else \ |
| 307 | { \ |
| 308 | gs->envelope_ticks = envelope_ticks; \ |
| 309 | } \ |
| 310 | } \ |
| 311 | |
| 312 | #define update_tone_noenvelope() \ |
| 313 | |
| 314 | #define update_tone_counters(envelope_op, sweep_op) \ |
| 315 | tick_counter += gbc_sound_tick_step; \ |
| 316 | if(tick_counter > 0xFFFF) \ |
| 317 | { \ |
| 318 | if(gs->length_status) \ |
| 319 | { \ |
| 320 | u32 length_ticks = gs->length_ticks - 1; \ |
| 321 | gs->length_ticks = length_ticks; \ |
| 322 | \ |
| 323 | if(length_ticks == 0) \ |
| 324 | { \ |
| 325 | gs->active_flag = 0; \ |
| 326 | break; \ |
| 327 | } \ |
| 328 | } \ |
| 329 | \ |
| 330 | update_tone_##envelope_op(); \ |
| 331 | update_tone_##sweep_op(); \ |
| 332 | \ |
| 333 | tick_counter &= 0xFFFF; \ |
| 334 | } \ |
| 335 | |
| 336 | #define gbc_sound_render_sample_right() \ |
| 337 | sound_buffer[buffer_index + 1] += (current_sample * volume_right) >> 22 \ |
| 338 | |
| 339 | #define gbc_sound_render_sample_left() \ |
| 340 | sound_buffer[buffer_index] += (current_sample * volume_left) >> 22 \ |
| 341 | |
| 342 | #define gbc_sound_render_sample_both() \ |
| 343 | gbc_sound_render_sample_right(); \ |
| 344 | gbc_sound_render_sample_left() \ |
| 345 | |
| 346 | #define gbc_sound_render_samples(type, sample_length, envelope_op, sweep_op) \ |
| 347 | for(i = 0; i < buffer_ticks; i++) \ |
| 348 | { \ |
| 349 | current_sample = \ |
| 350 | sample_data[fp16_16_to_u32(sample_index) % sample_length]; \ |
| 351 | gbc_sound_render_sample_##type(); \ |
| 352 | \ |
| 353 | sample_index += frequency_step; \ |
| 354 | buffer_index = (buffer_index + 2) % BUFFER_SIZE; \ |
| 355 | \ |
| 356 | update_tone_counters(envelope_op, sweep_op); \ |
| 357 | } \ |
| 358 | |
| 359 | #define gbc_noise_wrap_full 32767 |
| 360 | |
| 361 | #define gbc_noise_wrap_half 126 |
| 362 | |
| 363 | #define get_noise_sample_full() \ |
| 364 | current_sample = \ |
| 365 | ((s32)(noise_table15[fp16_16_to_u32(sample_index) >> 5] << \ |
| 366 | (fp16_16_to_u32(sample_index) & 0x1F)) >> 31) & 0x0F \ |
| 367 | |
| 368 | #define get_noise_sample_half() \ |
| 369 | current_sample = \ |
| 370 | ((s32)(noise_table7[fp16_16_to_u32(sample_index) >> 5] << \ |
| 371 | (fp16_16_to_u32(sample_index) & 0x1F)) >> 31) & 0x0F \ |
| 372 | |
| 373 | #define gbc_sound_render_noise(type, noise_type, envelope_op, sweep_op) \ |
| 374 | for(i = 0; i < buffer_ticks; i++) \ |
| 375 | { \ |
| 376 | get_noise_sample_##noise_type(); \ |
| 377 | gbc_sound_render_sample_##type(); \ |
| 378 | \ |
| 379 | sample_index += frequency_step; \ |
| 380 | \ |
| 381 | if(sample_index >= u32_to_fp16_16(gbc_noise_wrap_##noise_type)) \ |
| 382 | sample_index -= u32_to_fp16_16(gbc_noise_wrap_##noise_type); \ |
| 383 | \ |
| 384 | buffer_index = (buffer_index + 2) % BUFFER_SIZE; \ |
| 385 | update_tone_counters(envelope_op, sweep_op); \ |
| 386 | } \ |
| 387 | |
| 388 | #define gbc_sound_render_channel(type, sample_length, envelope_op, sweep_op) \ |
| 389 | buffer_index = gbc_sound_buffer_index; \ |
| 390 | sample_index = gs->sample_index; \ |
| 391 | frequency_step = gs->frequency_step; \ |
| 392 | tick_counter = gs->tick_counter; \ |
| 393 | \ |
| 394 | update_volume(envelope_op); \ |
| 395 | \ |
| 396 | switch(gs->status) \ |
| 397 | { \ |
| 398 | case GBC_SOUND_INACTIVE: \ |
| 399 | break; \ |
| 400 | \ |
| 401 | case GBC_SOUND_LEFT: \ |
| 402 | gbc_sound_render_##type(left, sample_length, envelope_op, sweep_op); \ |
| 403 | break; \ |
| 404 | \ |
| 405 | case GBC_SOUND_RIGHT: \ |
| 406 | gbc_sound_render_##type(right, sample_length, envelope_op, sweep_op); \ |
| 407 | break; \ |
| 408 | \ |
| 409 | case GBC_SOUND_LEFTRIGHT: \ |
| 410 | gbc_sound_render_##type(both, sample_length, envelope_op, sweep_op); \ |
| 411 | break; \ |
| 412 | } \ |
| 413 | \ |
| 414 | gs->sample_index = sample_index; \ |
| 415 | gs->tick_counter = tick_counter; \ |
| 416 | |
| 417 | #define gbc_sound_load_wave_ram(bank) \ |
| 418 | wave_bank = wave_samples + (bank * 32); \ |
| 419 | for(i = 0, i2 = 0; i < 16; i++, i2 += 2) \ |
| 420 | { \ |
| 421 | current_sample = wave_ram[i]; \ |
| 422 | wave_bank[i2] = (((current_sample >> 4) & 0x0F) - 8); \ |
| 423 | wave_bank[i2 + 1] = ((current_sample & 0x0F) - 8); \ |
| 424 | } \ |
| 425 | |
| 426 | void update_gbc_sound(u32 cpu_ticks) |
| 427 | { |
| 428 | fixed16_16 buffer_ticks = float_to_fp16_16((float)(cpu_ticks - |
| 429 | gbc_sound_last_cpu_ticks) * sound_frequency / GBC_BASE_RATE); |
| 430 | u32 i, i2; |
| 431 | gbc_sound_struct *gs = gbc_sound_channel; |
| 432 | fixed16_16 sample_index, frequency_step; |
| 433 | fixed16_16 tick_counter; |
| 434 | u32 buffer_index; |
| 435 | s32 volume_left, volume_right; |
| 436 | u32 envelope_volume; |
| 437 | s32 current_sample; |
| 438 | u32 sound_status = address16(io_registers, 0x84) & 0xFFF0; |
| 439 | s8 *sample_data; |
| 440 | s8 *wave_bank; |
| 441 | u8 *wave_ram = ((u8 *)io_registers) + 0x90; |
| 442 | |
| 443 | gbc_sound_partial_ticks += fp16_16_fractional_part(buffer_ticks); |
| 444 | buffer_ticks = fp16_16_to_u32(buffer_ticks); |
| 445 | |
| 446 | if(gbc_sound_partial_ticks > 0xFFFF) |
| 447 | { |
| 448 | buffer_ticks += 1; |
| 449 | gbc_sound_partial_ticks &= 0xFFFF; |
| 450 | } |
| 451 | |
| 452 | SDL_LockMutex(sound_mutex); |
| 453 | if(synchronize_flag) |
| 454 | { |
| 455 | if(((gbc_sound_buffer_index - sound_buffer_base) % BUFFER_SIZE) >= |
| 456 | (audio_buffer_size * 2)) |
| 457 | { |
| 458 | while(((gbc_sound_buffer_index - sound_buffer_base) % BUFFER_SIZE) > |
| 459 | (audio_buffer_size * 3 / 2)) |
| 460 | { |
| 461 | SDL_CondWait(sound_cv, sound_mutex); |
| 462 | } |
| 463 | |
| 464 | #ifdef PSP_BUILD |
| 465 | if(current_frameskip_type == auto_frameskip) |
| 466 | { |
| 467 | sceDisplayWaitVblankStart(); |
| 468 | real_frame_count = 0; |
| 469 | virtual_frame_count = 0; |
| 470 | } |
| 471 | #else |
| 472 | if(current_frameskip_type == auto_frameskip) |
| 473 | { |
| 474 | /* |
| 475 | u64 current_ticks; |
| 476 | u64 next_ticks; |
| 477 | get_ticks_us(¤t_ticks); |
| 478 | |
| 479 | next_ticks = ((current_ticks + 16666) / 16667) * 16667; |
| 480 | delay_us(next_ticks - current_ticks); |
| 481 | |
| 482 | get_ticks_us(&frame_count_initial_timestamp); |
| 483 | */ |
| 484 | /* prevent frameskip, or it will cause more audio, |
| 485 | * then more waiting here, then frame skip again, ... */ |
| 486 | num_skipped_frames = 100; |
| 487 | } |
| 488 | #endif |
| 489 | |
| 490 | } |
| 491 | } |
| 492 | if(sound_on == 1) |
| 493 | { |
| 494 | gs = gbc_sound_channel + 0; |
| 495 | if(gs->active_flag) |
| 496 | { |
| 497 | sound_status |= 0x01; |
| 498 | sample_data = gs->sample_data; |
| 499 | envelope_volume = gs->envelope_volume; |
| 500 | gbc_sound_render_channel(samples, 8, envelope, sweep); |
| 501 | } |
| 502 | |
| 503 | gs = gbc_sound_channel + 1; |
| 504 | if(gs->active_flag) |
| 505 | { |
| 506 | sound_status |= 0x02; |
| 507 | sample_data = gs->sample_data; |
| 508 | envelope_volume = gs->envelope_volume; |
| 509 | gbc_sound_render_channel(samples, 8, envelope, nosweep); |
| 510 | } |
| 511 | |
| 512 | gs = gbc_sound_channel + 2; |
| 513 | if(gbc_sound_wave_update) |
| 514 | { |
| 515 | if(gs->wave_bank == 1) |
| 516 | { |
| 517 | gbc_sound_load_wave_ram(1); |
| 518 | } |
| 519 | else |
| 520 | { |
| 521 | gbc_sound_load_wave_ram(0); |
| 522 | } |
| 523 | |
| 524 | gbc_sound_wave_update = 0; |
| 525 | } |
| 526 | |
| 527 | if((gs->active_flag) && (gs->master_enable)) |
| 528 | { |
| 529 | sound_status |= 0x04; |
| 530 | sample_data = wave_samples; |
| 531 | if(gs->wave_type == 0) |
| 532 | { |
| 533 | if(gs->wave_bank == 1) |
| 534 | sample_data += 32; |
| 535 | |
| 536 | gbc_sound_render_channel(samples, 32, noenvelope, nosweep); |
| 537 | } |
| 538 | else |
| 539 | { |
| 540 | gbc_sound_render_channel(samples, 64, noenvelope, nosweep); |
| 541 | } |
| 542 | } |
| 543 | |
| 544 | gs = gbc_sound_channel + 3; |
| 545 | if(gs->active_flag) |
| 546 | { |
| 547 | sound_status |= 0x08; |
| 548 | envelope_volume = gs->envelope_volume; |
| 549 | |
| 550 | if(gs->noise_type == 1) |
| 551 | { |
| 552 | gbc_sound_render_channel(noise, half, envelope, nosweep); |
| 553 | } |
| 554 | else |
| 555 | { |
| 556 | gbc_sound_render_channel(noise, full, envelope, nosweep); |
| 557 | } |
| 558 | } |
| 559 | } |
| 560 | |
| 561 | address16(io_registers, 0x84) = sound_status; |
| 562 | |
| 563 | gbc_sound_last_cpu_ticks = cpu_ticks; |
| 564 | gbc_sound_buffer_index = |
| 565 | (gbc_sound_buffer_index + (buffer_ticks * 2)) % BUFFER_SIZE; |
| 566 | |
| 567 | SDL_UnlockMutex(sound_mutex); |
| 568 | |
| 569 | SDL_CondSignal(sound_cv); |
| 570 | } |
| 571 | |
| 572 | #define sound_copy_normal() \ |
| 573 | current_sample = source[i] \ |
| 574 | |
| 575 | #define sound_copy(source_offset, length, render_type) \ |
| 576 | _length = (length) / 2; \ |
| 577 | source = (s16 *)(sound_buffer + source_offset); \ |
| 578 | for(i = 0; i < _length; i++) \ |
| 579 | { \ |
| 580 | sound_copy_##render_type(); \ |
| 581 | if(current_sample > 2047) \ |
| 582 | current_sample = 2047; \ |
| 583 | if(current_sample < -2048) \ |
| 584 | current_sample = -2048; \ |
| 585 | \ |
| 586 | stream_base[i] = current_sample << 4; \ |
| 587 | source[i] = 0; \ |
| 588 | } \ |
| 589 | |
| 590 | #define sound_copy_null(source_offset, length) \ |
| 591 | _length = (length) / 2; \ |
| 592 | source = (s16 *)(sound_buffer + source_offset); \ |
| 593 | for(i = 0; i < _length; i++) \ |
| 594 | { \ |
| 595 | stream_base[i] = 0; \ |
| 596 | source[i] = 0; \ |
| 597 | } \ |
| 598 | |
| 599 | |
| 600 | void sound_callback(void *userdata, Uint8 *stream, int length) |
| 601 | { |
| 602 | u32 sample_length = length / 2; |
| 603 | u32 _length; |
| 604 | u32 i; |
| 605 | s16 *stream_base = (s16 *)stream; |
| 606 | s16 *source; |
| 607 | s32 current_sample; |
| 608 | |
| 609 | SDL_LockMutex(sound_mutex); |
| 610 | |
| 611 | while(((gbc_sound_buffer_index - sound_buffer_base) % BUFFER_SIZE) < |
| 612 | length && !sound_exit_flag) |
| 613 | { |
| 614 | SDL_CondWait(sound_cv, sound_mutex); |
| 615 | } |
| 616 | |
| 617 | if(global_enable_audio) |
| 618 | { |
| 619 | if((sound_buffer_base + sample_length) >= BUFFER_SIZE) |
| 620 | { |
| 621 | u32 partial_length = (BUFFER_SIZE - sound_buffer_base) * 2; |
| 622 | sound_copy(sound_buffer_base, partial_length, normal); |
| 623 | source = (s16 *)sound_buffer; |
| 624 | sound_copy(0, length - partial_length, normal); |
| 625 | sound_buffer_base = (length - partial_length) / 2; |
| 626 | } |
| 627 | else |
| 628 | { |
| 629 | sound_copy(sound_buffer_base, length, normal); |
| 630 | sound_buffer_base += sample_length; |
| 631 | } |
| 632 | } |
| 633 | else |
| 634 | { |
| 635 | if((sound_buffer_base + sample_length) >= BUFFER_SIZE) |
| 636 | { |
| 637 | u32 partial_length = (BUFFER_SIZE - sound_buffer_base) * 2; |
| 638 | sound_copy_null(sound_buffer_base, partial_length); |
| 639 | source = (s16 *)sound_buffer; |
| 640 | sound_copy(0, length - partial_length, normal); |
| 641 | sound_buffer_base = (length - partial_length) / 2; |
| 642 | } |
| 643 | else |
| 644 | { |
| 645 | sound_copy_null(sound_buffer_base, length); |
| 646 | sound_buffer_base += sample_length; |
| 647 | } |
| 648 | } |
| 649 | |
| 650 | SDL_CondSignal(sound_cv); |
| 651 | |
| 652 | SDL_UnlockMutex(sound_mutex); |
| 653 | } |
| 654 | |
| 655 | // Special thanks to blarrg for the LSFR frequency used in Meridian, as posted |
| 656 | // on the forum at http://meridian.overclocked.org: |
| 657 | // http://meridian.overclocked.org/cgi-bin/wwwthreads/showpost.pl?Board=merid |
| 658 | // angeneraldiscussion&Number=2069&page=0&view=expanded&mode=threaded&sb=4 |
| 659 | // Hope you don't mind me borrowing it ^_- |
| 660 | |
| 661 | void init_noise_table(u32 *table, u32 period, u32 bit_length) |
| 662 | { |
| 663 | u32 shift_register = 0xFF; |
| 664 | u32 mask = ~(1 << bit_length); |
| 665 | s32 table_pos, bit_pos; |
| 666 | u32 current_entry; |
| 667 | u32 table_period = (period + 31) / 32; |
| 668 | |
| 669 | // Bits are stored in reverse order so they can be more easily moved to |
| 670 | // bit 31, for sign extended shift down. |
| 671 | |
| 672 | for(table_pos = 0; table_pos < table_period; table_pos++) |
| 673 | { |
| 674 | current_entry = 0; |
| 675 | for(bit_pos = 31; bit_pos >= 0; bit_pos--) |
| 676 | { |
| 677 | current_entry |= (shift_register & 0x01) << bit_pos; |
| 678 | |
| 679 | shift_register = |
| 680 | ((1 & (shift_register ^ (shift_register >> 1))) << bit_length) | |
| 681 | ((shift_register >> 1) & mask); |
| 682 | } |
| 683 | |
| 684 | table[table_pos] = current_entry; |
| 685 | } |
| 686 | } |
| 687 | |
| 688 | void reset_sound() |
| 689 | { |
| 690 | direct_sound_struct *ds = direct_sound_channel; |
| 691 | gbc_sound_struct *gs = gbc_sound_channel; |
| 692 | u32 i; |
| 693 | |
| 694 | SDL_LockMutex(sound_mutex); |
| 695 | |
| 696 | sound_on = 0; |
| 697 | sound_buffer_base = 0; |
| 698 | sound_last_cpu_ticks = 0; |
| 699 | memset(sound_buffer, 0, sizeof(sound_buffer)); |
| 700 | |
| 701 | for(i = 0; i < 2; i++, ds++) |
| 702 | { |
| 703 | ds->buffer_index = 0; |
| 704 | ds->status = DIRECT_SOUND_INACTIVE; |
| 705 | ds->fifo_top = 0; |
| 706 | ds->fifo_base = 0; |
| 707 | ds->fifo_fractional = 0; |
| 708 | ds->last_cpu_ticks = 0; |
| 709 | memset(ds->fifo, 0, 32); |
| 710 | } |
| 711 | |
| 712 | gbc_sound_buffer_index = 0; |
| 713 | gbc_sound_last_cpu_ticks = 0; |
| 714 | gbc_sound_partial_ticks = 0; |
| 715 | |
| 716 | gbc_sound_master_volume_left = 0; |
| 717 | gbc_sound_master_volume_right = 0; |
| 718 | gbc_sound_master_volume = 0; |
| 719 | memset(wave_samples, 0, 64); |
| 720 | |
| 721 | for(i = 0; i < 4; i++, gs++) |
| 722 | { |
| 723 | gs->status = GBC_SOUND_INACTIVE; |
| 724 | gs->sample_data = square_pattern_duty[2]; |
| 725 | gs->active_flag = 0; |
| 726 | } |
| 727 | |
| 728 | SDL_UnlockMutex(sound_mutex); |
| 729 | } |
| 730 | |
| 731 | void sound_exit() |
| 732 | { |
| 733 | gbc_sound_buffer_index = |
| 734 | (sound_buffer_base + audio_buffer_size) % BUFFER_SIZE; |
| 735 | SDL_PauseAudio(1); |
| 736 | sound_exit_flag = 1; |
| 737 | SDL_CondSignal(sound_cv); |
| 738 | SDL_CloseAudio(); |
| 739 | SDL_Delay(200); |
| 740 | SDL_DestroyMutex(sound_mutex); |
| 741 | sound_mutex = NULL; |
| 742 | SDL_DestroyCond(sound_cv); |
| 743 | sound_cv = NULL; |
| 744 | } |
| 745 | |
| 746 | void init_sound(int need_reset) |
| 747 | { |
| 748 | SDL_AudioSpec sound_settings; |
| 749 | |
| 750 | sound_exit_flag = 0; |
| 751 | #ifdef PSP_BUILD |
| 752 | audio_buffer_size = (audio_buffer_size_number * 1024) + 3072; |
| 753 | #else |
| 754 | audio_buffer_size = 16 << audio_buffer_size_number; |
| 755 | // audio_buffer_size = 16384; |
| 756 | #endif |
| 757 | |
| 758 | SDL_AudioSpec desired_spec = |
| 759 | { |
| 760 | sound_frequency, |
| 761 | AUDIO_S16, |
| 762 | 2, |
| 763 | 0, |
| 764 | audio_buffer_size / 4, |
| 765 | 0, |
| 766 | 0, |
| 767 | sound_callback, |
| 768 | NULL |
| 769 | }; |
| 770 | |
| 771 | sound_mutex = SDL_CreateMutex(); |
| 772 | sound_cv = SDL_CreateCond(); |
| 773 | |
| 774 | SDL_OpenAudio(&desired_spec, &sound_settings); |
| 775 | sound_frequency = sound_settings.freq; |
| 776 | audio_buffer_size = sound_settings.size; |
| 777 | u32 i = audio_buffer_size / 16; |
| 778 | for (audio_buffer_size_number = 0; i && (i & 1) == 0; i >>= 1) |
| 779 | audio_buffer_size_number++; |
| 780 | #ifndef PSP_BUILD |
| 781 | printf("audio: freq %d, size %d\n", sound_frequency, audio_buffer_size); |
| 782 | #endif |
| 783 | |
| 784 | gbc_sound_tick_step = |
| 785 | float_to_fp16_16(256.0f / sound_frequency); |
| 786 | |
| 787 | init_noise_table(noise_table15, 32767, 14); |
| 788 | init_noise_table(noise_table7, 127, 6); |
| 789 | |
| 790 | if (need_reset) |
| 791 | reset_sound(); |
| 792 | |
| 793 | SDL_PauseAudio(0); |
| 794 | } |
| 795 | |
| 796 | #define sound_savestate_builder(type) \ |
| 797 | void sound_##type##_savestate(file_tag_type savestate_file) \ |
| 798 | { \ |
| 799 | file_##type##_variable(savestate_file, sound_on); \ |
| 800 | file_##type##_variable(savestate_file, sound_buffer_base); \ |
| 801 | file_##type##_variable(savestate_file, sound_last_cpu_ticks); \ |
| 802 | file_##type##_variable(savestate_file, gbc_sound_buffer_index); \ |
| 803 | file_##type##_variable(savestate_file, gbc_sound_last_cpu_ticks); \ |
| 804 | file_##type##_variable(savestate_file, gbc_sound_partial_ticks); \ |
| 805 | file_##type##_variable(savestate_file, gbc_sound_master_volume_left); \ |
| 806 | file_##type##_variable(savestate_file, gbc_sound_master_volume_right); \ |
| 807 | file_##type##_variable(savestate_file, gbc_sound_master_volume); \ |
| 808 | file_##type##_array(savestate_file, wave_samples); \ |
| 809 | file_##type##_array(savestate_file, direct_sound_channel); \ |
| 810 | file_##type##_array(savestate_file, gbc_sound_channel); \ |
| 811 | } \ |
| 812 | |
| 813 | sound_savestate_builder(read); |
| 814 | sound_savestate_builder(write_mem); |
| 815 | |