Initial commit

Assets/Procedural Worlds/Gaia/Shaders/Terrain Operations/CombineCollisionMasks.shader

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+Shader "Hidden/Gaia/CombineCollisionMasks" {
+
+	Properties{
+	//The input texture
+	_InputTex("Input Texture", any) = "" {}
+	//The image mask texture
+	_ImageMaskTex("Image Mask Texture", any) = "" {}
+	//V4 to store width & height dimensions of textures: x,y=_InputTex z,w=_ImageMaskText
+	_Dimensions("Texture Dimensions", Vector) = (1,1,1,1)
+	//Flag to determine whether the Mask is inverted or not
+	_Invert("Invert Distance Mask", Int) = 0
+	//Strength from 0 to 1 to determine how "strong" the image mask effect is applied
+	_Strength("Strength", Float) = 0
+
+
+	}
+
+		SubShader{
+
+			ZTest Always Cull Off ZWrite Off
+
+			CGINCLUDE
+
+				#include "UnityCG.cginc"
+				#include "TerrainTool.cginc"
+
+				sampler2D _InputTex;
+				sampler2D _ImageMaskTex;
+				int _Invert;
+				float _Strength;
+				float4 _Dimensions;
+
+				float4 _MainTex_TexelSize;      // 1/width, 1/height, width, height
+
+
+
+				struct appdata_t {
+					float4 vertex : POSITION;
+					float2 pcUV : TEXCOORD0;
+				};
+
+				struct v2f {
+					float4 vertex : SV_POSITION;
+					float2 pcUV : TEXCOORD0;
+				};
+
+				v2f vert(appdata_t v)
+				{
+					v2f o;
+					o.vertex = UnityObjectToClipPos(v.vertex);
+					o.pcUV = v.pcUV;
+					return o;
+				}
+			ENDCG
+
+
+			Pass    // 1 Filter Image Greater Than
+			{
+				Name "Filter Image Greater Than"
+
+				CGPROGRAM
+				#pragma vertex vert
+				#pragma fragment FilterImageGreaterThan
+
+				float4 FilterImageGreaterThan(v2f i) : SV_Target
+				{
+					float col = UnpackHeightmap(tex2D(_InputTex, i.pcUV));
+					//scale the UV input according to the size difference so that the image mask tex
+					float2 relativeUV = i.pcUV;
+					relativeUV.x = i.pcUV.x * 1.0f;// (_Dimensions.z / _Dimensions.x);
+					relativeUV.y = i.pcUV.y * 1.0f; // (_Dimensions.w / _Dimensions.y);
+					float col2 = UnpackHeightmap(tex2D(_ImageMaskTex, relativeUV));
+
+
+
+					if (_Invert > 0)
+					{
+						col2 = (1.0f - col2);
+					}
+
+					float result = col;
+					if (col2 < col)
+					{
+						result = col2;
+					}
+
+					return PackHeightmap(result);
+					//return PackHeightmap(lerp(col,result,_Strength));
+				}
+				ENDCG
+			}
+
+
+	}
+		Fallback Off
+}