Waveform visualizer

WaveformDisplay.cs

using System;
using System.Collections;
using System.Threading;
using UnityEngine;

class WaveformDisplay : MonoBehaviour
{
	public Tracker Tracker;

	public int LineSegments;
	[Range(0, 16384)]
	public int SampleWindow;

	static Material lineMaterial;

	float[] buffer;

	static void EnsureLineMaterial()
	{
		if (!lineMaterial)
		{
			lineMaterial = new Material("Shader \"Lines/Colored Blended\" {" +
			                            "SubShader { Pass { " +
			                            "    Blend SrcAlpha OneMinusSrcAlpha " +
			                            "    ZWrite Off Cull Off Fog { Mode Off } " +
			                            "    BindChannels {" +
			                            "      Bind \"vertex\", vertex Bind \"color\", color }" +
			                            "} } }");
			lineMaterial.hideFlags = HideFlags.HideAndDontSave;
			lineMaterial.shader.hideFlags = HideFlags.HideAndDontSave;
		}
	}

	void OnGUI()
	{
		if (buffer == null || buffer.Length != SampleWindow)
			buffer = new float[SampleWindow];
		Tracker.audio.GetOutputData(buffer, 0);

		EnsureLineMaterial();

		lineMaterial.SetPass(0);
		GL.Begin(GL.LINES);
		GL.Color(new Color(1, 1, 1, 1));

		float screenOffset = transform.position.x;
		float width = transform.localScale.x;
		float height = transform.localScale.y;

		for (int i = 0; i < LineSegments; i++)
		{
			int fromSample = Mathf.RoundToInt((float)i / LineSegments * SampleWindow);
			int toSample = Mathf.RoundToInt((float)(i + 1) / LineSegments * SampleWindow);

			float fromValue = buffer[Mathf.Clamp(fromSample, 0, buffer.Length - 1)];
			float toValue = buffer[Mathf.Clamp(toSample, 0, buffer.Length - 1)];

			GL.Vertex3(((float)i / LineSegments) * width + screenOffset, fromValue * height, 0);
			GL.Vertex3(((float)(i + 1) / LineSegments) * width + screenOffset, toValue * height, 0);
		}
		GL.End();
	}
}