starfighter/src/audio.c

236 lines
5.0 KiB
C

/*
Copyright (C) 2003 Parallel Realities
Copyright (C) 2011, 2012 Guus Sliepen
Copyright (C) 2015-2019 Julie Marchant <onpon4@riseup.net>
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 3
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, see <http://www.gnu.org/licenses/>.
*/
#include <math.h>
#ifndef NOSOUND
#include "SDL_mixer.h"
#endif
#include "defs.h"
#include "structs.h"
#include "game.h"
#include "engine.h"
#include "screen.h"
#ifndef NOSOUND
static Mix_Chunk *sound[SFX_MAX];
static Mix_Music *music = NULL;
#endif
void audio_loadSounds()
{
#ifndef NOSOUND
sound[SFX_EXPLOSION] = Mix_LoadWAV("sound/explode.ogg");
sound[SFX_HIT] = Mix_LoadWAV("sound/explode2.ogg");
sound[SFX_DEATH] = Mix_LoadWAV("sound/maledeath.ogg");
sound[SFX_MISSILE] = Mix_LoadWAV("sound/missile.ogg");
sound[SFX_PLASMA] = Mix_LoadWAV("sound/plasma.ogg");
sound[SFX_CLOCK] = Mix_LoadWAV("sound/clock.ogg");
sound[SFX_FLY] = Mix_LoadWAV("sound/flyby.ogg");
sound[SFX_ENERGYRAY] = Mix_LoadWAV("sound/beamLaser.ogg");
sound[SFX_PICKUP] = Mix_LoadWAV("sound/item.ogg");
sound[SFX_SHIELDUP] = Mix_LoadWAV("sound/shield.ogg");
sound[SFX_CLOAK] = Mix_LoadWAV("sound/cloak.ogg");
sound[SFX_DEBRIS] = Mix_LoadWAV("sound/explode3.ogg");
sound[SFX_DEBRIS2] = Mix_LoadWAV("sound/explode4.ogg");
sound[SFX_LASER] = Mix_LoadWAV("sound/laser.ogg");
sound[SFX_PLASMA2] = Mix_LoadWAV("sound/plasma2.ogg");
sound[SFX_PLASMA3] = Mix_LoadWAV("sound/plasma3.ogg");
#endif
}
void audio_playSound(int sid, float x, float y)
{
#ifndef NOSOUND
int channel = -1;
static int freechannel = 4;
static int channelVolume[4] = {0, 0, 0, 0};
int angle = atanf((x - (screen->w / 2)) / (screen->w / 2)) * 180 / M_PI;
int attenuation = fabsf(x - (screen->w / 2)) / (screen->w / 20);
float distance = sqrtf(powf(fabsf(x - (screen->w / 2)), 2) + powf(fabsf(y - (screen->h / 2)), 2));
int volume = MIX_MAX_VOLUME - (MIX_MAX_VOLUME * distance / (3 * screen->w));
if ((!engine.useSound) || (!engine.useAudio) || (volume <= 0))
return;
switch(sid)
{
case SFX_DEATH:
case SFX_CLOCK:
case SFX_FLY:
case SFX_SHIELDUP:
case SFX_PICKUP:
case SFX_CLOAK:
case SFX_PLASMA2:
case SFX_PLASMA3:
channel = -1;
break;
case SFX_PLASMA:
case SFX_LASER:
channel = 0;
break;
case SFX_ENERGYRAY:
case SFX_MISSILE:
channel = 1;
break;
case SFX_HIT:
channel = 2;
break;
case SFX_EXPLOSION:
case SFX_DEBRIS:
case SFX_DEBRIS2:
channel = 3;
break;
}
if (channel == -1)
{
channel = freechannel++;
if (freechannel >= 8)
freechannel = 4;
}
else
{
if (Mix_Playing(channel) && (volume <= MIX_MAX_VOLUME / 4) &&
(channelVolume[channel] >= MIX_MAX_VOLUME * 3 / 4))
return;
else
channelVolume[channel] = volume;
}
angle %= 360;
if (angle < 0)
angle += 360;
if (attenuation > 255)
attenuation = 255;
Mix_SetPosition(channel, angle, attenuation);
Mix_Volume(channel, volume);
Mix_PlayChannel(channel, sound[sid], 0);
#endif
}
void audio_haltMusic()
{
#ifndef NOSOUND
if (Mix_PlayingMusic())
{
Mix_ResumeMusic();
Mix_HaltMusic();
}
if (music != NULL)
{
Mix_FreeMusic(music);
music = NULL;
}
#endif
}
void audio_pauseMusic()
{
#ifndef NOSOUND
if (Mix_PlayingMusic() && !Mix_PausedMusic())
Mix_PauseMusic();
#endif
}
void audio_resumeMusic()
{
#ifndef NOSOUND
Mix_ResumeMusic();
#endif
}
void audio_setMusicVolume(int volume)
{
#ifndef NOSOUND
if (engine.useMusic && engine.useAudio)
Mix_VolumeMusic(volume);
#endif
}
void audio_playMusic(const char *filename, int loops)
{
#ifndef NOSOUND
if (engine.useMusic && engine.useAudio)
{
audio_haltMusic();
music = Mix_LoadMUS(filename);
audio_setMusicVolume(100);
Mix_PlayMusic(music, loops);
}
#endif
}
void audio_playRandomTrack()
{
#ifndef NOSOUND
if ((!engine.useMusic) || (!engine.useAudio))
return;
int tracks = 4;
char track[][64] = {
"music/railjet_short.ogg", "music/space_dimensions.ogg",
"music/frozen_jam.ogg", "music/sound_and_silence.ogg"
};
switch(game.area)
{
case MISN_START:
audio_playMusic("music/railjet_short.ogg", -1);
break;
case MISN_MOEBO:
case MISN_ELAMALE:
case MISN_ELLESH:
case MISN_EARTH:
audio_playMusic("music/orbital_colossus.ogg", -1);
break;
case MISN_VENUS:
audio_playMusic("music/RE.ogg", -1);
break;
default:
audio_playMusic(track[rand() % tracks], -1);
}
#endif
}
void audio_free()
{
#ifndef NOSOUND
for (int i = 0 ; i < SFX_MAX ; i++)
{
if (sound[i] != NULL)
{
Mix_FreeChunk(sound[i]);
sound[i] = NULL;
}
}
if (music != NULL)
{
Mix_FreeMusic(music);
music = NULL;
}
#endif
}