build base for mixer

src/audio/audio.jai

@@ -1,19 +1,6 @@
 #load "backend.jai";
 #load "load.jai";
-
-Mixer_Bus :: enum {
-    MUSIC;
-    SOUND_EFFECT;
-    DIALOGUE;
-}
-
-Mixer :: struct {
-    
-}
-
-mixer_get_samples :: (buffer: *float, mixer: *Mixer, sampleCount: s32, channelCount: s32) {
-    
-}
+#load "mixer.jai";
 
 audio_init :: () {
     load_wav_file();

src/audio/load.jai

@@ -1,3 +1,7 @@
+Audio_Data :: struct {
+    
+}
+
 Wav :: #import "Wav_File";
 
 audio_info : Wav.Waveformatex;

src/audio/mixer.jai

@@ -0,0 +1,87 @@
+#if OS != .WASM {
+    Thread :: #import "Thread";
+}
+
+Mixer_Bus :: enum {
+    MUSIC;
+    SOUND_EFFECT;
+    DIALOGUE;
+}
+
+Play_Mode :: enum {
+    ONESHOT;
+    REPEAT;
+}
+
+Mixer_Play_Task :: struct {
+    audio     : *Audio_Data;
+    bus       : Mixer_Bus;
+    mode      : Play_Mode;
+    curSample : s64;
+
+    startTime           : float64;
+    delay               : float64;
+    silenceBeforeRepeat : float64;
+}
+
+Mixer_Config :: struct {
+    masterVolume       : float = 0.5; @Slider,0,1,0.1
+    dialogueVolume     : float = 0.5; @Slider,0,1,0.1
+    soundEffectVolume  : float = 0.5; @Slider,0,1,0.1
+}
+
+Mixer :: struct {
+    #if OS != .WASM {
+        // If we are on WASM, the Thread module mutex does not work.
+        // Fortunately we don't need a mutex for this, since sokol does
+        // not do multithreading for audio on WASM.
+        //
+        // Let's just have the mutex as a part of the struct on all platforms
+        // except WASM. It would probably be a good idea to have a mutex wrapper
+        // thing that would use the Thread module Mutex or a mutex that works with
+        // WASM. :NoMutexForWasm
+        mutex : Thread.Mutex;
+    }
+
+    config     : Mixer_Config;
+    tasks      : [..]Mixer_Play_Task;
+}
+
+// Removes tasks from the mixer's task list that
+// no longer have a reason to be on the task list.
+// Eg. a sound that is .ONESHOT but has already been played.
+mixer_clean_tasks :: (mixer: *Mixer) {
+    mixer_lock(mixer);
+    defer mixer_unlock(mixer);
+    
+}
+
+mixer_add_task :: (mixer: *Mixer, task: Mixer_Play_Task) {
+    mixer_lock(mixer);
+    defer mixer_unlock(mixer);
+    
+}
+
+mixer_get_samples :: (mixer: *Mixer, samples: *float, sampleCount: s32, channelCount: s32) {
+    mixer_lock(mixer);
+    defer mixer_unlock(mixer);
+
+    
+}
+
+mixer_lock :: (mixer: *Mixer) {
+    #if OS != .WASM {
+        Thread.lock(*mixer.mutex);
+    } else {
+        return; // On WASM this is a no-op. See :NoMutexForWasm
+    }
+}
+
+mixer_unlock :: (mixer: *Mixer) {
+    #if OS != .WASM {
+        Thread.unlock(*mixer.mutex);
+    } else {
+        return; // On WASM this is a no-op. See :NoMutexForWasm
+    }
+    
+}