音の波形を画面に描画するスクリプト

WaveVisualizer.cs

using UnityEngine;
using System.Collections;

[RequireComponent(typeof(Camera))]
public class WaveVisualizer : MonoBehaviour {

    public int dataLength = 128;
    public float waveHeightWeight = 0.1f;
    [Range(0f, 1f)]
    public float waveWidth = 0.8f;
    [Range(0f, 1f)]
    public float baseX = 0.1f;
    [Range(0f, 1f)]
    public float baseY = 0.4f;
    public float drawDepth = 10f;
    public Material lineMaterial;
    [Header("If size 0, automatically use AudioListener.")]
    public AudioSource[] sources;
    private Camera camera;
    private float[] data;

    void Awake() {
        camera = GetComponent<Camera>();
    }

    void Update() {
        data = new float[dataLength];
        if (sources.Length == 0) {
            AudioListener.GetOutputData(data, 0);
        } else {
            float[] buffer = new float[dataLength];
            foreach (AudioSource audio in sources) {
                audio.GetOutputData(buffer, 0);
                for (int idx = 0; idx < dataLength; idx++) {
                    data[idx] += buffer[idx] / sources.Length;
                }
            }
        }
    }

    void OnPostRender() {
        lineMaterial.SetPass(0);
        GL.Begin(GL.LINES);
        GL.Color(Color.white);
        float step = waveWidth / data.Length;
        for (int idx = 0; idx < data.Length - 1; idx++) {
            Vector3 v1 = camera.ViewportToWorldPoint(
                new Vector3(
                    baseX + step * idx, 
                    baseY + data[idx] * waveHeightWeight,
                    drawDepth));
            Vector3 v2 = camera.ViewportToWorldPoint(
                new Vector3(
                    baseX + step * (idx + 1), 
                    baseY + data[idx + 1] * waveHeightWeight,
                    drawDepth));
            GL.Vertex3(v1.x, v1.y, v1.z);
            GL.Vertex3(v2.x, v2.y, v2.z);
        }
        GL.End();
    }
}