func AddSource(in snd.Sound) error {
switch in.Channels() {
case 1:
hwa.format = al.FormatMono16
case 2:
hwa.format = al.FormatStereo16
default:
return fmt.Errorf("snd/al: can't handle input with channels(%v)", in.Channels())
}
hwa.in = in
hwa.out = make([]byte, in.BufferLen()*2)
s := al.GenSources(1)
if code := al.Error(); code != 0 {
return fmt.Errorf("snd/al: generate source failed [err=%v]", code)
}
hwa.source = s[0]
hwa.buf.src = s[0]
log.Println("snd/al: software latency", SoftLatency())
hwa.inputs = snd.GetInputs(in)
return nil
}
// TODO just how many samples do we want/need to display something useful?
func NewWaveform(ctx gl.Context, n int, in snd.Sound) (*Waveform, error) {
wf := &Waveform{Material: env.NewMaterial(ctx), Sound: in}
wf.Drawer = wf.Draw
wf.outs = make([][]float64, n)
for i := range wf.outs {
wf.outs[i] = make([]float64, in.BufferLen()*in.Channels())
}
wf.samples = make([]float64, in.BufferLen()*in.Channels()*n)
wf.verts = make([]float32, len(wf.samples)*2)
wf.prg.CreateAndLink(ctx,
glutil.ShaderAsset(gl.VERTEX_SHADER, "basic-vert.glsl"),
glutil.ShaderAsset(gl.FRAGMENT_SHADER, "basic-frag.glsl"))
wf.vbuf = glutil.NewFloatBuffer(ctx, wf.verts, gl.STREAM_DRAW)
wf.uw = wf.prg.Uniform(ctx, "world")
wf.uv = wf.prg.Uniform(ctx, "view")
wf.up = wf.prg.Uniform(ctx, "proj")
wf.uc = wf.prg.Uniform(ctx, "color")
wf.ap = wf.prg.Attrib(ctx, "position")
return wf, nil
}