Got the sound

1 files changed, 45 insertions, 0 deletions

diff --git a/source/saw/main.c b/source/saw/main.c
index 691307a..d32188f 100644
--- a/source/saw/main.c
+++ b/source/saw/main.c
@@ -26,7 +26,34 @@
 #define MINIAUDIO_IMPLEMENTATION
 #include "../thirdparty/miniaudio.h"
 
+#include "../kit/math.h"
+
+enum {
+  SAW_CHANNEL_COUNT = 2,
+  SAW_SAMPLE_RATE   = 44100,
+};
+
 static struct NVGcontext *saw_nvg;
+static ma_device          saw_ma;
+
+static void saw_audio(ma_device *device, void *void_out_,
+                      void const *void_in_, ma_uint32 frame_count) {
+  static i64 t = 0;
+
+  f64 period    = M_PI * 2.;
+  f64 amplitude = .2;
+  f64 frequency = 240.;
+
+  f32 *out = (f32 *) void_out_;
+
+  for (i64 i = 0; i < frame_count; i++) {
+    f64 k          = (period * frequency) / SAW_SAMPLE_RATE;
+    out[i * 2]     = (f32) (sin(k * t) * amplitude);
+    out[i * 2 + 1] = (f32) (sin(k * t) * amplitude);
+
+    t++;
+  }
+}
 
 static void saw_init(void) {
 #ifdef SOKOL_GLCORE33
@@ -34,6 +61,22 @@ static void saw_init(void) {
 #else
   saw_nvg = nvgCreateGLES3(NVG_ANTIALIAS | NVG_STENCIL_STROKES);
 #endif
+
+  ma_device_config config = ma_device_config_init(
+      ma_device_type_playback);
+
+  config.playback.format   = ma_format_f32;
+  config.playback.channels = SAW_CHANNEL_COUNT;
+  config.sampleRate        = SAW_SAMPLE_RATE;
+  config.dataCallback      = saw_audio;
+  config.pUserData         = NULL;
+
+  if (ma_device_init(NULL, &config, &saw_ma) != MA_SUCCESS) {
+    printf("ma_device_init failed.\n");
+    return;
+  }
+
+  ma_device_start(&saw_ma);
 }
 
 static void saw_frame(void) {
@@ -57,6 +100,8 @@ static void saw_frame(void) {
 }
 
 static void saw_cleanup(void) {
+  ma_device_uninit(&saw_ma);
+
 #ifdef SOKOL_GLCORE33
   nvgDeleteGL3(saw_nvg);
 #else