sound.cpp

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/*
 * This file is part of OpenTTD.
 * OpenTTD 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, version 2.
 * OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "stdafx.h"
#include "landscape.h"
#include "sound_type.h"
#include "soundloader_func.h"
#include "mixer.h"
#include "newgrf_sound.h"
#include "random_access_file_type.h"
#include "window_func.h"
#include "window_gui.h"
#include "vehicle_base.h"
 
/* The type of set we're replacing */
#define SET_TYPE "sounds"
#include "base_media_func.h"
 
#include "safeguards.h"
 
static std::array<SoundEntry, ORIGINAL_SAMPLE_COUNT> _original_sounds;
 
static void OpenBankFile(const std::string &filename)
{
  static std::unique_ptr<RandomAccessFile> original_sound_file;
 
  _original_sounds.fill({});
 
  /* If there is no sound file (nosound set), don't load anything */
  if (filename.empty()) return;
 
  original_sound_file = std::make_unique<RandomAccessFile>(filename, BASESET_DIR);
  size_t pos = original_sound_file->GetPos();
  uint count = original_sound_file->ReadDword();
 
  /* The new format has the highest bit always set */
  auto source = HasBit(count, 31) ? SoundSource::BasesetNewFormat : SoundSource::BasesetOldFormat;
  ClrBit(count, 31);
  count /= 8;
 
  /* Simple check for the correct number of original sounds. */
  if (count != ORIGINAL_SAMPLE_COUNT) {
    /* Corrupt sample data? Just leave the allocated memory as those tell
     * there is no sound to play (size = 0 due to calloc). Not allocating
     * the memory disables valid NewGRFs that replace sounds. */
    Debug(misc, 6, "Incorrect number of sounds in '{}', ignoring.", filename);
    return;
  }
 
  original_sound_file->SeekTo(pos, SEEK_SET);
 
  /* Read sound file positions. */
  for (auto &sound : _original_sounds) {
    sound.file = original_sound_file.get();
    sound.file_offset = GB(original_sound_file->ReadDword(), 0, 31) + pos;
    sound.file_size = original_sound_file->ReadDword();
    sound.source = source;
  }
}
 
static bool SetBankSource(MixerChannel *mc, SoundEntry *sound, SoundID sound_id)
{
  assert(sound != nullptr);
 
  if (sound->file != nullptr) {
    if (!LoadSound(*sound, sound_id)) {
      /* Mark as invalid. */
      sound->file = nullptr;
      return false;
    }
    sound->file = nullptr;
  }
 
  /* Check for valid sound. */
  if (sound->data->empty()) return false;
 
  MxSetChannelRawSrc(mc, sound->data, sound->rate, sound->bits_per_sample == 16);
 
  return true;
}
 
void InitializeSound()
{
  Debug(misc, 1, "Loading sound effects...");
  OpenBankFile(BaseSounds::GetUsedSet()->files->filename);
}
 
 
/* Low level sound player */
static void StartSound(SoundID sound_id, float pan, uint volume)
{
  if (volume == 0) return;
 
  SoundEntry *sound = GetSound(sound_id);
  if (sound == nullptr) return;
 
  if (sound->rate == 0) {
    /* If the sound's sample rate is not set then the sound needs to be loaded, but if the sound's file pointer
     * is empty then an attempt was already made to load the sound but it failed. We don't want to try again. */
    if (sound->file == nullptr) return;
  }
 
  MixerChannel *mc = MxAllocateChannel();
  if (mc == nullptr) return;
 
  if (!SetBankSource(mc, sound, sound_id)) return;
 
  /* Apply the sound effect's own volume. */
  volume = sound->volume * volume;
 
  MxSetChannelVolume(mc, volume, pan);
  MxActivateChannel(mc);
}
 
 
static const uint8_t _vol_factor_by_zoom[] = {255, 255, 255, 190, 134, 87};
static_assert(lengthof(_vol_factor_by_zoom) == ZOOM_LVL_END);
 
static const uint8_t _sound_base_vol[] = {
  128,  90, 128, 128, 128, 128, 128, 128,
  128,  90,  90, 128, 128, 128, 128, 128,
  128, 128, 128,  80, 128, 128, 128, 128,
  128, 128, 128, 128, 128, 128, 128, 128,
  128, 128,  90,  90,  90, 128,  90, 128,
  128,  90, 128, 128, 128,  90, 128, 128,
  128, 128, 128, 128,  90, 128, 128, 128,
  128,  90, 128, 128, 128, 128, 128, 128,
  128, 128,  90,  90,  90, 128, 128, 128,
   90,
};
 
static const uint8_t _sound_idx[] = {
   2,  3,  4,  5,  6,  7,  8,  9,
  10, 11, 12, 13, 14, 15, 16, 17,
  18, 19, 20, 21, 22, 23, 24, 25,
  26, 27, 28, 29, 30, 31, 32, 33,
  34, 35, 36, 37, 38, 39, 40,  0,
   1, 41, 42, 43, 44, 45, 46, 47,
  48, 49, 50, 51, 52, 53, 54, 55,
  56, 57, 58, 59, 60, 61, 62, 63,
  64, 65, 66, 67, 68, 69, 70, 71,
  72,
};
 
void SndCopyToPool()
{
  SoundEntry *sound = AllocateSound(ORIGINAL_SAMPLE_COUNT);
  for (uint i = 0; i < ORIGINAL_SAMPLE_COUNT; i++) {
    sound[i] = _original_sounds[_sound_idx[i]];
    sound[i].volume = _sound_base_vol[i];
    sound[i].priority = 0;
  }
}
 
void ChangeSoundSet(int index)
{
  if (BaseSounds::GetIndexOfUsedSet() == index) return;
 
  auto set = BaseSounds::GetSet(index);
  BaseSounds::ini_set = set->name;
  BaseSounds::SetSet(set);
 
  MxCloseAllChannels();
  InitializeSound();
 
  /* Replace baseset sounds in the pool with the updated original sounds. This is safe to do as
   * any sound still playing holds its own shared_ptr to the sample data. */
  for (uint i = 0; i < ORIGINAL_SAMPLE_COUNT; i++) {
    SoundEntry *sound = GetSound(i);
    /* GRF Container 0 means the sound comes from the baseset, and isn't overridden by NewGRF. */
    if (sound == nullptr || sound->grf_container_ver != 0) continue;
 
    *sound = _original_sounds[_sound_idx[i]];
    sound->volume = _sound_base_vol[i];
    sound->priority = 0;
  }
 
  InvalidateWindowData(WC_GAME_OPTIONS, WN_GAME_OPTIONS_GAME_OPTIONS, 0, true);
}
 
static void SndPlayScreenCoordFx(SoundID sound, int left, int right, int top, int bottom)
{
  /* Iterate from back, so that main viewport is checked first */
  for (const Window *w : Window::IterateFromBack()) {
    const Viewport *vp = w->viewport;
 
    if (vp != nullptr &&
        left < vp->virtual_left + vp->virtual_width && right > vp->virtual_left &&
        top < vp->virtual_top + vp->virtual_height && bottom > vp->virtual_top) {
      int screen_x = (left + right) / 2 - vp->virtual_left;
      int width = (vp->virtual_width == 0 ? 1 : vp->virtual_width);
      float panning = (float)screen_x / width;
 
      StartSound(
        sound,
        panning,
        _vol_factor_by_zoom[vp->zoom]
      );
      return;
    }
  }
}
 
void SndPlayTileFx(SoundID sound, TileIndex tile)
{
  /* emits sound from center of the tile */
  int x = std::min(Map::MaxX() - 1, TileX(tile)) * TILE_SIZE + TILE_SIZE / 2;
  int y = std::min(Map::MaxY() - 1, TileY(tile)) * TILE_SIZE - TILE_SIZE / 2;
  int z = (y < 0 ? 0 : GetSlopePixelZ(x, y));
  Point pt = RemapCoords(x, y, z);
  y += 2 * TILE_SIZE;
  Point pt2 = RemapCoords(x, y, GetSlopePixelZ(x, y));
  SndPlayScreenCoordFx(sound, pt.x, pt2.x, pt.y, pt2.y);
}
 
void SndPlayVehicleFx(SoundID sound, const Vehicle *v)
{
  SndPlayScreenCoordFx(sound,
    v->coord.left, v->coord.right,
    v->coord.top, v->coord.bottom
  );
}
 
void SndPlayFx(SoundID sound)
{
  StartSound(sound, 0.5, UINT8_MAX);
}
 
INSTANTIATE_BASE_MEDIA_METHODS(BaseMedia<SoundsSet>, SoundsSet)
 
 
static const char * const _sound_file_names[] = { "samples" };
 
 
template <class T, size_t Tnum_files, bool Tsearch_in_tars>
/* static */ const char * const *BaseSet<T, Tnum_files, Tsearch_in_tars>::file_names = _sound_file_names;
 
template <class Tbase_set>
/* static */ const char *BaseMedia<Tbase_set>::GetExtension()
{
  return ".obs"; // OpenTTD Base Sounds
}
 
template <class Tbase_set>
/* static */ bool BaseMedia<Tbase_set>::DetermineBestSet()
{
  if (BaseMedia<Tbase_set>::used_set != nullptr) return true;
 
  const Tbase_set *best = nullptr;
  for (const Tbase_set *c = BaseMedia<Tbase_set>::available_sets; c != nullptr; c = c->next) {
    /* Skip unusable sets */
    if (c->GetNumMissing() != 0) continue;
 
    if (best == nullptr ||
        (best->fallback && !c->fallback) ||
        best->valid_files < c->valid_files ||
        (best->valid_files == c->valid_files &&
          (best->shortname == c->shortname && best->version < c->version))) {
      best = c;
    }
  }
 
  BaseMedia<Tbase_set>::used_set = best;
  return BaseMedia<Tbase_set>::used_set != nullptr;
}