Add RetroSuite-3D shader components

Assets/Shaders/RetroPixelMax.shader

@@ -0,0 +1,51 @@
+Shader "Oxysoft/RetroPixelMax" {
+	Properties {
+		_ColorCount ("Color Count", Int) = 8
+	 	_MainTex ("", 2D) = "white" {}
+	}
+
+	SubShader {
+		Lighting Off
+		ZTest Always
+		Cull Off
+		ZWrite Off
+		Fog { Mode Off }
+
+	 	Pass {
+	  		CGPROGRAM
+			// Upgrade NOTE: excluded shader from DX11, Xbox360, OpenGL ES 2.0 because it uses unsized arrays
+	  		#pragma exclude_renderers flash
+	  		#pragma vertex vert_img
+	  		#pragma fragment frag
+			#pragma fragmentoption ARB_precision_hint_fastest
+	  		#include "UnityCG.cginc"
+
+	  		uniform int _ColorCount;
+			uniform fixed4 _Colors[256];
+	  		uniform sampler2D _MainTex;
+
+	  		fixed4 frag (v2f_img i) : COLOR
+	  		{
+	   			fixed3 original = tex2D (_MainTex, i.uv).rgb;
+
+	   			fixed4 col = fixed4 (0,0,0,0);
+	   			fixed dist = 10000000.0;
+
+	   			for (int i = 0; i < _ColorCount; i++) {
+	   				fixed4 c = _Colors[i];
+	   				fixed d = distance(original, c);
+
+	   				if (d < dist) {
+	   					dist = d;
+	   					col = c;
+	   				}
+	   			}
+
+				return col;
+	  		}
+	  		ENDCG
+	 	}
+	}
+
+	FallBack "Diffuse"
+}