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import time
import math
import sokol.audio
const (
sw = time.new_stopwatch()
sw_start_ms = sw.elapsed().milliseconds()
)
[inline]
fn sintone(periods int, frame int, num_frames int) f32 {
return math.sinf(f32(periods) * (2 * math.pi) * f32(frame) / f32(num_frames))
}
fn my_audio_stream_callback(buffer &f32, num_frames int, num_channels int) {
ms := sw.elapsed().milliseconds() - sw_start_ms
unsafe {
mut soundbuffer := buffer
for frame := 0; frame < num_frames; frame++ {
for ch := 0; ch < num_channels; ch++ {
idx := frame * num_channels + ch
if ms < 250 {
soundbuffer[idx] = 0.5 * sintone(20, frame, num_frames)
} else if ms < 300 {
soundbuffer[idx] = 0.5 * sintone(25, frame, num_frames)
} else if ms < 1500 {
soundbuffer[idx] *= sintone(22, frame, num_frames)
} else {
soundbuffer[idx] = 0.5 * sintone(25, frame, num_frames)
}
}
}
}
}
fn main() {
audio.setup(
stream_cb: my_audio_stream_callback
)
time.sleep(2000 * time.millisecond)
audio.shutdown()
}
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