audio_play_sound_spatialized.lua

-- Spatialized sound

hg = require("harfang")

hg.InputInit()
hg.AudioInit()

hg.AddAssetsFolder("resources_compiled")

snd_ref = hg.LoadWAVSoundAsset("sounds/metro_announce.wav")
src_ref = hg.PlaySpatialized(snd_ref, hg.SpatializedSourceState(hg.Mat4.Identity, 1, hg.SR_Loop))

angle = 0

while not hg.ReadKeyboard('raw'):Key(hg.K_Escape) do
	dt = hg.TickClock()
	dt_sec_f = hg.time_to_sec_f(dt)  -- delta frame in seconds

	-- compute the source old and new position in world
	src_old_pos = hg.Vec3(math.sin(angle), 0, math.cos(angle)) * 5
	angle = angle + hg.time_to_sec_f(hg.TickClock()) * 45
	src_new_pos = hg.Vec3(math.sin(angle), 0, math.cos(angle)) * 5

	-- source velocity in m.s-1
	src_vel = (src_new_pos - src_old_pos) / dt_sec_f

	-- update source properties
	hg.SetSourceTransform(src_ref, hg.TranslationMat4(src_new_pos), src_vel)
end

hg.AudioShutdown()
hg.InputShutdown()