Init.

P4 -> GitHub sync.

Assets/Shaders/CombineShader.shader

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+Shader "TextureCombiner/CombineShader"
+{
+    Properties
+    {
+        _MainTex("MainTex", 2D) = "white" {}
+        _Tex0("TexR", 2D) = "black" {}
+        _Tex1("TexG", 2D) = "black" {}
+        _Tex2("TexB", 2D) = "black" {}
+        _Tex3("TexA", 2D) = "black" {}
+        _Mask0("MaskR", Vector) = (0, 0, 0, 0)
+        _Mask1("MaskG", Vector) = (0, 0, 0, 0)
+        _Mask2("MaskB", Vector) = (0, 0, 0, 0)
+        _Mask3("MaskA", Vector) = (0, 0, 0, 0)
+        _Add("Add", Vector) = (0, 0, 0, 0)
+    }
+    SubShader
+    {
+        Tags { "RenderType"="Opaque" }
+        LOD 100
+
+        Pass
+        {
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+
+            #include "UnityCG.cginc"
+
+            struct appdata
+            {
+                float4 vertex : POSITION;
+                float2 uv : TEXCOORD0;
+            };
+
+            struct v2f
+            {
+                float2 uv : TEXCOORD0;
+                float4 vertex : SV_POSITION;
+            };
+
+            sampler2D _MainTex;
+            float4 _MainTex_ST;
+            sampler2D _Tex0;
+            sampler2D _Tex1;
+            sampler2D _Tex2;
+            sampler2D _Tex3;
+            float4 _Mask0;
+            float4 _Mask1;
+            float4 _Mask2;
+            float4 _Mask3;
+            float4 _Add;
+
+            v2f vert (appdata v)
+            {
+                v2f o;
+                o.vertex = UnityObjectToClipPos(v.vertex);
+                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
+                return o;
+            }
+
+            float GetChannelColor(float4 col, float4 mask)
+            {
+                return (col.r * mask.r) + (col.g * mask.g) + (col.b * mask.b) + (col.a * mask.a);
+            }
+
+            fixed4 frag(v2f i) : SV_Target
+            {
+                fixed4 col = fixed4(0, 0, 0, 0);
+
+                col.r = clamp(GetChannelColor(tex2D(_Tex0, i.uv).rgba, _Mask0) + _Add.r, 0, 1);
+                col.g = clamp(GetChannelColor(tex2D(_Tex1, i.uv).rgba, _Mask1) + _Add.g, 0, 1);
+                col.b = clamp(GetChannelColor(tex2D(_Tex2, i.uv).rgba, _Mask2) + _Add.b, 0, 1);
+                col.a = clamp(GetChannelColor(tex2D(_Tex3, i.uv).rgba, _Mask3) + _Add.a, 0, 1);
+
+                return col;
+            }
+            ENDCG
+        }
+    }
+}

Assets/Shaders/CombineShader.shader.meta

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+fileFormatVersion: 2
+guid: 549aae9fe3b32db48804f14851ff0f48
+ShaderImporter:
+  externalObjects: {}
+  defaultTextures: []
+  nonModifiableTextures: []
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: