RMS値によるビジュアライザを追加

Author: TyounanMOTI

Assets/AudioTexture/Examples/RMSVisualizer.meta

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+  m_Name: RMSVisualizer
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Assets/AudioTexture/Examples/RMSVisualizer/RMSVisualizer.mat

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+Shader "AudioTexture/RMSVisualizer"
+{
+	Properties
+	{
+		_MainTex ("Texture", 2D) = "white" {}
+		_SamplingFrequency ("Sampling Frequency", float) = 44100
+		_Color ("Color", Color) = (1, 1, 1, 0)
+		_Window ("Window Length (seconds)", float) = 0.01
+	}
+	SubShader
+	{
+		Tags { "RenderType"="Opaque" }
+		LOD 100
+
+		Pass
+		{
+			CGPROGRAM
+			#pragma vertex vert
+			#pragma fragment frag
+			// make fog work
+			#pragma multi_compile_fog
+			#pragma target 5.0
+
+			#include "UnityCG.cginc"
+
+			struct appdata
+			{
+				float4 vertex : POSITION;
+			};
+
+			struct v2f
+			{
+				UNITY_FOG_COORDS(1)
+				float4 vertex : SV_POSITION;
+			};
+
+			UNITY_DECLARE_TEX2D(_MainTex);
+			float _SamplingFrequency;
+			fixed4 _Color;
+			float _Window;
+			
+			v2f vert (appdata v)
+			{
+				float width, height;
+				_MainTex.GetDimensions(width, height);
+				float startTime = _Time.y - _Window;
+				float sum = 0.0;
+				[unroll(_Window * 48000)]
+				for (float audioSamplePos = startTime * _SamplingFrequency; audioSamplePos < _Time.y * _SamplingFrequency; audioSamplePos++) {
+					float2 uv = float2(fmod(audioSamplePos, width) / width, audioSamplePos / width / height);
+					float2 audio = _MainTex.SampleLevel(sampler_MainTex, uv, 0) * 2.0 - 1.0;
+					sum += audio.x * audio.x;
+				}
+				float rms = sqrt(sum / (_Window * _SamplingFrequency));
+
+				v2f o;
+				o.vertex = UnityObjectToClipPos(v.vertex * rms);
+				UNITY_TRANSFER_FOG(o,o.vertex);
+				return o;
+			}
+			
+			fixed4 frag (v2f i) : SV_Target
+			{
+				// sample the texture
+				fixed4 col = _Color;
+				// apply fog
+				UNITY_APPLY_FOG(i.fogCoord, col);
+				return col;
+			}
+			ENDCG
+		}
+	}
+}