Initial commit

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/audio.cpp

@@ -0,0 +1,170 @@
+#include "audio.h"
+#include "common.h"
+#include <SDL3/SDL.h>
+
+#include <stb_vorbis.c>
+
+constexpr float PITCH_VARIANCE = 0.06f;
+constexpr Uint64 SOUND_GAP = 40 * SDL_NS_PER_MS;
+constexpr const char* SOUND_NAMES[SOUND_COUNT] = {
+    "beam",
+    "blast",
+    "boomerang",
+    "boomerang_heavy",
+    "bounce",
+    "bow",
+    "bow_heavy",
+    "break",
+    "cast",
+    "charge",
+    "chat",
+    "crawl",
+    "dash",
+    "death",
+    "detonate",
+    "detonate_empty",
+    "duck",
+    "echo",
+    "equip",
+    "explosion",
+    "fall",
+    "finish",
+    "fireball",
+    "flail",
+    "flail_heavy",
+    "flail_land",
+    "flame",
+    "grapple",
+    "grapple_heavy",
+    "hit_blunt",
+    "hit_blunt_heavy",
+    "hit_bullet",
+    "hit_bullet_heavy",
+    "hit_energy",
+    "hit_energy_heavy",
+    "hit_explosive",
+    "hit_explosive_heavy",
+    "hit_fire",
+    "hit_fire_heavy",
+    "hit_lash",
+    "hit_lash_heavy",
+    "hit_magic",
+    "hit_magic_heavy",
+    "hit_pierce",
+    "hit_pierce_heavy",
+    "hit_slash",
+    "hit_slash_heavy",
+    "impact_arrow",
+    "impact_blaster",
+    "impact_boomerang",
+    "impact_bullet",
+    "impact_mine",
+    "jump",
+    "land",
+    "latch",
+    "level_down",
+    "level_up",
+    "mine",
+    "poke",
+    "poke_heavy",
+    "pound",
+    "punch",
+    "ready",
+    "ricochet",
+    "rocket",
+    "rocket_heavy",
+    "roll",
+    "select",
+    "shotgun",
+    "shotgun_heavy",
+    "slam",
+    "slash",
+    "slash_heavy",
+    "step",
+    "swap",
+    "swing",
+    "swing_heavy",
+    "teleport",
+    "teleport_warp",
+    "unduck",
+    "unequip",
+    "uppercut",
+    "uzi",
+    "uzi_heavy",
+    "whip",
+    "whip_heavy",
+    "wisp",
+    "zap",
+};
+
+void Audio::init()
+{
+    if (SDL_InitSubSystem(SDL_INIT_AUDIO))
+        device = SDL_OpenAudioDevice(SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK, nullptr);
+    if (!device)
+    {
+        SDL_Log("Failed to open audio: %s", SDL_GetError());
+        return;
+    }
+
+    for (int i = 0; i < SOUND_COUNT; i++)
+    {
+        std::string path = path_get("sfx/") + SOUND_NAMES[i] + ".ogg";
+        Sound& sound = sounds[i];
+        sound.frames = stb_vorbis_decode_filename(path.c_str(), &sound.channels, &sound.rate, &sound.samples);
+        if (sound.frames <= 0)
+            SDL_Log("Failed to load %s", path.c_str());
+    }
+
+    SDL_AudioSpec deviceSpec = {};
+    SDL_GetAudioDeviceFormat(device, &deviceSpec, nullptr);
+    for (SDL_AudioStream*& voice : voices)
+    {
+        voice = SDL_CreateAudioStream(&deviceSpec, &deviceSpec);
+        SDL_BindAudioStream(device, voice);
+    }
+}
+
+// Plays a sound with a slight random pitch and returns the voice used, or -1 if it was skipped.
+int Audio::play(SoundId id)
+{
+    if (id == SOUND_NONE)
+        return -1;
+    Sound& sound = sounds[id];
+    Uint64 now = SDL_GetTicksNS();
+    if (!device || sound.frames <= 0 || isMuted || now - sound.played < SOUND_GAP)
+        return -1;
+    sound.played = now;
+
+    int voice = voiceNext;
+    for (int i = 0; i < VOICE_COUNT; i++)
+    {
+        if (SDL_GetAudioStreamQueued(voices[i]) == 0)
+        {
+            voice = i;
+            break;
+        }
+    }
+    voiceNext = (voice + 1) % VOICE_COUNT;
+
+    SDL_AudioStream* stream = voices[voice];
+    SDL_AudioSpec spec = {SDL_AUDIO_S16, sound.channels, sound.rate};
+    SDL_ClearAudioStream(stream);
+    SDL_SetAudioStreamFormat(stream, &spec, nullptr);
+    SDL_SetAudioStreamFrequencyRatio(stream, random_get(1 - PITCH_VARIANCE, 1 + PITCH_VARIANCE));
+    SDL_PutAudioStreamData(stream, sound.samples, sound.frames * sound.channels * sizeof(short));
+    return voice;
+}
+
+// Sets the volume of everything played, from silent at 0 to full at 1.
+void Audio::gain_set(float gain)
+{
+    if (device)
+        SDL_SetAudioDeviceGain(device, gain);
+}
+
+void Audio::stop(int voice)
+{
+    if (voice >= 0)
+        SDL_ClearAudioStream(voices[voice]);
+}