group entity updates in as few packets as possible

[blank.git] / src / audio / audio.cpp

diff --git a/src/audio/audio.cpp b/src/audio/audio.cpp
index eed5dac170e514999074ca7948ec803c90328c1a..426745f7912b60383f16b32739c151f486e24f6b 100644 (file)
--- a/src/audio/audio.cpp
+++ b/src/audio/audio.cpp
@@ -92,14 +92,23 @@ void Audio::Play(
        const glm::vec3 &vel,
        const glm::vec3 &dir
 ) noexcept {
-       // TODO: find next free source
-       ALuint src = source[0];
+       int i = NextFree();
+       if (i < 0) {
+               std::cerr << "unable to find free audio source" << std::endl;
+               return;
+       }
+
+       ALuint src = source[i];
+       IntervalTimer &t = timer[i];
 
        sound.Bind(src);
        alSourcefv(src, AL_POSITION, glm::value_ptr(pos));
        alSourcefv(src, AL_VELOCITY, glm::value_ptr(vel));
        alSourcefv(src, AL_DIRECTION, glm::value_ptr(dir));
        alSourcePlay(src);
+
+       t = IntervalTimer(sound.Duration());
+       t.Start();
 }
 
 void Audio::StopAll() noexcept {
@@ -109,9 +118,35 @@ void Audio::StopAll() noexcept {
        }
 }
 
+void Audio::Update(int dt) noexcept {
+       for (std::size_t i = 0; i < NUM_SRC; ++i) {
+               timer[i].Update(dt);
+               if (timer[i].HitOnce()) {
+                       timer[i].Stop();
+                       alSourceStop(source[i]);
+                       alSourcei(source[i], AL_BUFFER, AL_NONE);
+                       last_free = i;
+               }
+       }
+}
+
+int Audio::NextFree() noexcept {
+       if (!timer[last_free].Running()) {
+               return last_free;
+       }
+       for (int i = (last_free + 1) % NUM_SRC; i != last_free; i = (i + 1) % NUM_SRC) {
+               if (!timer[i].Running()) {
+                       last_free = i;
+                       return i;
+               }
+       }
+       return -1;
+}
+
 
 Sound::Sound()
-: handle(AL_NONE) {
+: handle(AL_NONE)
+, duration(0) {
        alGenBuffers(1, &handle);
        ALenum err = alGetError();
        if (err != AL_NO_ERROR) {
@@ -124,6 +159,14 @@ Sound::Sound(const char *file)
        if (handle == AL_NONE) {
                throw ALError(alGetError(), "alutCreateBufferFromFile");
        }
+
+       ALint size, channels, bits, freq;
+       alGetBufferi(handle, AL_SIZE, &size);
+       alGetBufferi(handle, AL_CHANNELS, &channels);
+       alGetBufferi(handle, AL_BITS, &bits);
+       alGetBufferi(handle, AL_FREQUENCY, &freq);
+
+       duration = size * 8 * 1000 / (channels * bits * freq);
 }
 
 Sound::~Sound() {