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 < 500 { soundbuffer[idx] = sintone(20, frame, num_frames) } else if ms < 1000 { soundbuffer[idx] = sintone(25, frame, num_frames) } else if ms < 1500 { soundbuffer[idx] *= sintone(22, frame, num_frames) } else { soundbuffer[idx] = sintone(25, frame, num_frames) } } } } } fn main() { audio.setup({ stream_cb: my_audio_stream_callback }) time.sleep_ms(2500) audio.shutdown() }