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-rw-r--r--source/saw/main.c45
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