Initial commit

Assets/Procedural Worlds/Gaia/Shaders/PW General/PW_ChannelCombine.shader

@@ -0,0 +1,71 @@
+// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
+
+Shader "Hidden/Gaia/CombineColorChannels"
+{
+    Properties
+    {
+        // we have removed support for texture tiling/offset,
+        // so make them not be displayed in material inspector
+        [NoScaleOffset] _RedChannelTex ("Texture", 2D) = "black" {}
+        [NoScaleOffset] _GreenChannelTex ("Texture", 2D) = "black" {}
+        [NoScaleOffset] _BlueChannelTex ("Texture", 2D) = "black" {}
+        [NoScaleOffset] _AlphaChannelTex ("Texture", 2D) = "black" {}
+    }
+    SubShader
+    {
+        Pass
+        {
+            CGPROGRAM
+            // use "vert" function as the vertex shader
+            #pragma vertex vert
+            // use "frag" function as the __pixel__ (fragment) shader
+            #pragma fragment frag
+
+            // vertex shader inputs
+            struct appdata
+            {
+                float4 vertex : POSITION; // vertex position
+                float2 uv : TEXCOORD0; // texture coordinate
+            };
+
+            // vertex shader outputs ("vertex to fragment")
+            struct v2f
+            {
+                float2 uv : TEXCOORD0; // texture coordinate
+                float4 vertex : SV_POSITION; // clip space position
+            };
+
+            // vertex shader
+            v2f vert (appdata v)
+            {
+                v2f o;
+                // transform position to clip space
+                // (multiply with model*view*projection matrix)
+                o.vertex = UnityObjectToClipPos(v.vertex);
+                // just pass the texture coordinate
+                o.uv = v.uv;
+                return o;
+            }
+            
+            // textures we will sample
+            sampler2D _RedChannelTex;
+            sampler2D _GreenChannelTex;
+            sampler2D _BlueChannelTex;
+            sampler2D _AlphaChannelTex;
+
+            // pixel shader; returns low precision ("fixed4" type)
+            // color ("SV_Target" semantic)
+            fixed4 frag (v2f i) : SV_Target
+            {
+                // sample texture and return it
+                fixed4 col = float4(0.0f, 0.0f, 0.0f, 0.0f);
+                col.r = tex2D(_RedChannelTex, i.uv);
+                col.g = tex2D(_GreenChannelTex, i.uv);
+                col.b = tex2D(_BlueChannelTex, i.uv);
+                col.a = tex2D(_AlphaChannelTex, i.uv);
+                return col;
+            }
+            ENDCG
+        }
+    }
+}