Add text decal shader

Assets/Shaders/SDF.cginc

@@ -29,10 +29,17 @@ float sdRoundedUVBox( float2 uv, float r ) {
     return sdRoundedBox(pos, halfDim, r);
 }
 
-float SDFAA(float dist) {
-    float ddist = length(float2(ddx(dist), ddy(dist)));
+inline float SDFdDist(float dist) {
+    return length(float2(ddx(dist), ddy(dist)));
+}
+
+inline float SDFAA(float dist, float ddist) {
     float pixelDist = dist / ddist;
     return saturate(0.5-pixelDist);
 }
 
+inline float SDFAA(float dist) {
+    return SDFAA(dist, SDFdDist(dist));
+}
+
 #endif

Assets/Shaders/TextDecal.cginc

@@ -0,0 +1,41 @@
+float4 _DecalColor;
+float _Weight;
+
+float4 _OutlineColor;
+float _OutlineWidth;
+
+void surf(DecalSurfaceInput IN, inout SurfaceOutput o) {
+    float4 color = _DecalColor;
+
+    float bias = _Cutoff - (_Weight / 4);
+    #ifdef DECAL_OUTLINE
+        bias -= _OutlineWidth * 0.25;
+    #endif
+    float dist = bias - tex2D(_Decal, IN.uv_decal).r;
+    float ddist = SDFdDist(dist);
+    
+    #ifdef DECAL_OUTLINE
+        float outlineDist = (_OutlineWidth * 0.5) + dist;
+        float outline = SDFAA(outlineDist, -ddist);
+        color = lerp(color, _OutlineColor, outline);
+    #endif
+    
+    o.Albedo = UnderwaterFog(IN.worldPosition, color).rgb;
+    o.Alpha =  _DecalOpacity * SDFAA(dist, ddist);
+
+    #ifdef DECAL_BASE_NORMAL
+        float3 normal = IN.normal;
+        float wearFactor = 1 - normal.z;
+        float wearFactorAlpha = saturate(_EdgeWearStrength * wearFactor);
+        o.Alpha *= saturate(1 + _EdgeWearOffset - saturate(_EdgeWearStrength * wearFactor));
+    #endif
+
+    #ifdef DECAL_SPECMAP
+        float4 specular = tex2D(_SpecMap, IN.uv_specmap);
+        o.Gloss = specular.r;
+        o.Specular = _Shininess;
+    #endif
+
+    half rim = 1.0 - saturate(dot(normalize(IN.viewDir), o.Normal));
+    o.Emission = (_RimColor.rgb * pow(rim, _RimFalloff)) * _RimColor.a;
+}

Assets/Shaders/TextDecal.shader

@@ -0,0 +1,109 @@
+Shader "ConformalDecals/Decal/Text"
+{
+    Properties
+    {
+        [Header(Decal)]
+        _Decal("Decal Texture", 2D) = "gray" {}
+        _DecalColor("Decal Color", Color) = (1,1,1,1)
+        
+        _Weight("Text Weight", Range(0,1)) = 0
+        
+        [Header(Outline)]
+        [Toggle(DECAL_OUTLINE)] _Outline ("Outline", int) = 0
+        _OutlineColor("Outline Color", Color) = (0,0,0,1)
+        _OutlineWidth("Outline Width", Range(0,1)) = 0.1
+
+        [Header(Normal)]
+        [Toggle(DECAL_BASE_NORMAL)] _BaseNormal ("Use Base Normal", int) = 0
+        _BumpMap("Bump Map", 2D) = "bump" {}
+        _EdgeWearStrength("Edge Wear Strength", Range(0,500)) = 100
+        _EdgeWearOffset("Edge Wear Offset", Range(0,1)) = 0.1
+    
+        [Header(Specularity)]
+        [Toggle(DECAL_SPECMAP)] _Decal_SpecMap ("Has SpecMap", int) = 0
+        _SpecMap ("Specular Map)", 2D) = "black" {}
+        _SpecColor ("_SpecColor", Color) = (0.25, 0.25, 0.25, 1)
+        _Shininess ("Shininess", Range (0.03, 10)) = 0.3
+
+        _Cutoff ("Alpha cutoff", Range(0,1)) = 0.5
+        _DecalOpacity("Opacity", Range(0,1) ) = 1
+        _Background("Background Color", Color) = (0.9,0.9,0.9,0.7)
+        
+        [Enum(UnityEngine.Rendering.CullMode)] _Cull ("Cull", int) = 2
+        [Toggle] _ZWrite ("ZWrite", Float) = 1.0
+
+        [Toggle(DECAL_PREVIEW)] _Preview ("Preview", int) = 0
+
+        [Header(Effects)]
+        [PerRendererData]_Opacity("_Opacity", Range(0,1) ) = 1
+        _Color("_Color", Color) = (1,1,1,1)
+        [PerRendererData]_RimFalloff("_RimFalloff", Range(0.01,5) ) = 0.1
+        [PerRendererData]_RimColor("_RimColor", Color) = (0,0,0,0)
+        [PerRendererData]_UnderwaterFogFactor ("Underwater Fog Factor", Range(0,1)) = 0
+    }
+    SubShader
+    {
+        Tags { "Queue" = "Geometry+100" "IgnoreProjector" = "true" "DisableBatching" = "true"}
+        Cull [_Cull]
+        
+        Pass
+        {
+            Name "FORWARD"
+            Tags { "LightMode" = "ForwardBase" }
+            ZWrite [_ZWrite] 
+            ZTest LEqual  
+            Blend SrcAlpha OneMinusSrcAlpha
+
+            CGPROGRAM
+            #pragma vertex vert_forward
+            #pragma fragment frag_forward
+
+            #pragma multi_compile_fwdbase nolightmap nodirlightmap nodynlightmap
+            #pragma skip_variants SHADOWS_DEPTH SHADOWS_CUBE SHADOWS_SHADOWMASK LIGHTMAP_SHADOW_MIXING POINT_COOKIE
+            #pragma multi_compile_local __ DECAL_PREVIEW
+            #pragma multi_compile_local __ DECAL_BASE_NORMAL
+            #pragma multi_compile_local __ DECAL_SPECMAP
+            #pragma multi_compile_local __ DECAL_OUTLINE
+
+            #include "UnityCG.cginc"
+            #include "DecalsCommon.cginc"
+            #include "DecalsSurface.cginc"
+            #include "SDF.cginc"
+            #include "TextDecal.cginc"
+ 
+            ENDCG
+        } 
+        
+        Pass
+        {
+            Name "FORWARD"
+            Tags { "LightMode" = "ForwardAdd" }
+            ZWrite Off
+            ZTest LEqual  
+            Blend One One
+            Offset -1, -1
+
+            CGPROGRAM
+            #pragma vertex vert_forward
+            #pragma fragment frag_forward
+
+            #pragma multi_compile_fwdadd nolightmap nodirlightmap nodynlightmap
+            #pragma skip_variants SHADOWS_DEPTH SHADOWS_CUBE SHADOWS_SHADOWMASK LIGHTMAP_SHADOW_MIXING POINT_COOKIE
+            #pragma multi_compile_local __ DECAL_PREVIEW
+            #pragma multi_compile_local __ DECAL_BASE_NORMAL
+            #pragma multi_compile_local __ DECAL_SPECMAP
+            #pragma multi_compile_local __ DECAL_OUTLINE
+  
+            #include "UnityCG.cginc"
+            #include "DecalsCommon.cginc"
+            #include "DecalsSurface.cginc"
+            #include "SDF.cginc"
+            #include "TextDecal.cginc"
+
+            ENDCG
+        } 
+        
+        // shadow casting support
+        UsePass "Legacy Shaders/VertexLit/SHADOWCASTER"
+    }
+}