// Modified version of Unity built-in shader.

Shader "Hidden/TerrainEngine/Splatmap/Digger/Cuttable-Triplanar-AddPass" {
    Properties
    {
        // controls transparency to cut holes
        _TerrainHolesTexture ("Transparency Map (RGBA)", 2D) = "white" {}
        
        [HideInInspector] _TerrainWidthInv ("_TerrainWidthInv", float) = 1.0
        [HideInInspector] _TerrainHeightInv ("_TerrainHeightInv", float) = 1.0
    }
    SubShader {
        Tags {
            "Queue" = "Geometry-99"
            "IgnoreProjector"="True"
            "RenderType" = "Opaque"
        }

        CGPROGRAM
        #pragma surface surf Standard decal:add vertex:SplatmapVert finalcolor:SplatmapFinalColor finalgbuffer:SplatmapFinalGBuffer fullforwardshadows nometa
        #pragma instancing_options assumeuniformscaling nomatrices nolightprobe nolightmap forwardadd
        #pragma multi_compile_fog
        #pragma target 3.0
        // needs more than 8 texcoords
        #pragma exclude_renderers gles
        #include "UnityPBSLighting.cginc"

        #define _NORMALMAP
        #define TERRAIN_SPLAT_ADDPASS
        #define TERRAIN_STANDARD_SHADER
        #define TERRAIN_INSTANCED_PERPIXEL_NORMAL
        #define TERRAIN_SURFACE_OUTPUT SurfaceOutputStandard
        #include "TerrainSplatmapCuttableTriplanar.cginc"

        half _Metallic0;
        half _Metallic1;
        half _Metallic2;
        half _Metallic3;

        half _Smoothness0;
        half _Smoothness1;
        half _Smoothness2;
        half _Smoothness3;

        void surf (Input IN, inout SurfaceOutputStandard o) {
            half4 splat_control;
            half weight;
            fixed4 mixedDiffuse;
            half4 defaultSmoothness = half4(_Smoothness0, _Smoothness1, _Smoothness2, _Smoothness3);
            SplatmapMix(IN, defaultSmoothness, splat_control, weight, mixedDiffuse, o.Normal);
            o.Albedo = mixedDiffuse.rgb;
            o.Alpha = weight;
            o.Smoothness = mixedDiffuse.a;
            o.Metallic = dot(splat_control, half4(_Metallic0, _Metallic1, _Metallic2, _Metallic3));
        }
        ENDCG
    }

    Fallback "Hidden/TerrainEngine/Splatmap/Diffuse-AddPass"
}