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osystem_sfx.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#include <malloc.h>

#include "osystem.h"

#define SFX_THREAD_STACKSIZE (1024 * 128)
#define SFX_THREAD_PRIO 80
#define SFX_THREAD_FRAG_SIZE 4096

static lwpq_t sfx_queue;
static lwp_t sfx_thread;
static u8 *sfx_stack;
static bool sfx_thread_running = false;
static bool sfx_thread_quit = false;

static u8 sb = 0;
static u8 *sound_buffer[2];

static void audio_switch_buffers() {
      AUDIO_StopDMA();
      AUDIO_InitDMA((u32) sound_buffer[sb], SFX_THREAD_FRAG_SIZE);
      AUDIO_StartDMA();

      LWP_ThreadSignal(sfx_queue);
}

static void * sfx_thread_func(void *arg) {
      Audio::MixerImpl *mixer = (Audio::MixerImpl *) arg;
      u8 next_sb;

      while (true) {
            LWP_ThreadSleep(sfx_queue);

            if (sfx_thread_quit)
                  break;

            next_sb = sb ^ 1;
            mixer->mixCallback(sound_buffer[next_sb], SFX_THREAD_FRAG_SIZE);
            DCFlushRange(sound_buffer[next_sb], SFX_THREAD_FRAG_SIZE);

            sb = next_sb;
      }

      return NULL;
}

void OSystem_Wii::initSfx() {
      sfx_thread_running = false;
      sfx_thread_quit = false;

      sfx_stack = (u8 *) memalign(32, SFX_THREAD_STACKSIZE);

      if (sfx_stack) {
            memset(sfx_stack, 0, SFX_THREAD_STACKSIZE);

            LWP_InitQueue(&sfx_queue);

            s32 res = LWP_CreateThread(&sfx_thread, sfx_thread_func, _mixer, sfx_stack,
                                                      SFX_THREAD_STACKSIZE, SFX_THREAD_PRIO);

            if (res) {
                  printf("ERROR creating sfx thread: %d\n", res);
                  LWP_CloseQueue(sfx_queue);
                  return;
            }

            sfx_thread_running = true;
      }

      sound_buffer[0] = (u8 *) memalign(32, SFX_THREAD_FRAG_SIZE);
      sound_buffer[1] = (u8 *) memalign(32, SFX_THREAD_FRAG_SIZE);

      memset(sound_buffer[0], 0, SFX_THREAD_FRAG_SIZE);
      memset(sound_buffer[1], 0, SFX_THREAD_FRAG_SIZE);

      DCFlushRange(sound_buffer[0], SFX_THREAD_FRAG_SIZE);
      DCFlushRange(sound_buffer[1], SFX_THREAD_FRAG_SIZE);

      _mixer->setOutputRate(48000);
      _mixer->setReady(true);

      AUDIO_SetDSPSampleRate(AI_SAMPLERATE_48KHZ);
      AUDIO_RegisterDMACallback(audio_switch_buffers);

      audio_switch_buffers();
}

void OSystem_Wii::deinitSfx() {
      if (_mixer)
            _mixer->setReady(false);

      AUDIO_StopDMA();
      AUDIO_RegisterDMACallback(NULL);

      if (sfx_thread_running) {
            sfx_thread_quit = true;
            LWP_ThreadBroadcast(sfx_queue);

            LWP_JoinThread(sfx_thread, NULL);
            LWP_CloseQueue(sfx_queue);

            free(sfx_stack);
            sfx_thread_running = false;

            free(sound_buffer[0]);
            free(sound_buffer[1]);
      }
}


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