Basic audio system start

src/dusk/audio/DuskAudioSystem.cpp

@@ -0,0 +1,82 @@
+#include "dusk/audio/DuskAudioSystem.h"
+
+#include <SDL3/SDL_init.h>
+#include <array>
+
+#include "JSystem/JAudio2/JASAiCtrl.h"
+#include "JSystem/JAudio2/JASChannel.h"
+#include "JSystem/JAudio2/JASCriticalSection.h"
+#include "JSystem/JAudio2/JASDSPChannel.h"
+#include "JSystem/JAudio2/JASHeapCtrl.h"
+
+#include "DuskDsp.hpp"
+
+static DspSubframe AllSubframeBuffers[DSP_OUTPUT_CHANNELS];
+
+static SDL_AudioStream* PlaybackStream;
+
+static void SDLCALL GetNewAudio(
+    void *userdata,
+    SDL_AudioStream *stream,
+    int additional_amount,
+    int total_amount);
+
+static int RenderNewAudioFrame();
+static void RenderAudioSubframe();
+
+static void InitSDL3Output() {
+    SDL_Init(SDL_INIT_AUDIO);
+
+    constexpr SDL_AudioSpec spec = {
+        SDL_AUDIO_S16,
+        1,
+        32000,
+    };
+    PlaybackStream = SDL_OpenAudioDeviceStream(
+        SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK,
+        &spec,
+        &GetNewAudio,
+        nullptr);
+}
+
+void DuskAudioInitialize() {
+    InitSDL3Output();
+
+    JASDsp::initBuffer();
+    JASDSPChannel::initAll();
+
+    JASPoolAllocObject_MultiThreaded<JASChannel>::newMemPool(0x48);
+
+    SDL_ResumeAudioStreamDevice(PlaybackStream);
+}
+
+void SDLCALL GetNewAudio(
+    void*,
+    SDL_AudioStream*,
+    int,
+    int total_amount) {
+    while (total_amount > 0) {
+        const int rendered = RenderNewAudioFrame();
+        total_amount -= rendered;
+    }
+}
+
+int RenderNewAudioFrame() {
+    JASCriticalSection section;
+    const u32 countSubframes = JASDriver::getSubFrames();
+
+    for (u32 i = 0; i < countSubframes; i++) {
+        RenderAudioSubframe();
+    }
+
+    return static_cast<u16>(countSubframes) * DSP_SUBFRAME_SIZE;
+}
+
+void RenderAudioSubframe() {
+    DspSubframe& subFrame = AllSubframeBuffers[0];
+
+    JASDriver::updateDSP();
+    DuskDspRender(subFrame);
+
+    SDL_PutAudioStreamData(PlaybackStream, &subFrame, sizeof(subFrame));
+}