Add basic ui controller

Assets/Shaders/DecalsCommon.cginc

@@ -157,7 +157,6 @@ inline float SDFAA(float dist) {
     float ddist = length(float2(ddx(dist), ddy(dist)));
     float pixelDist = dist / ddist;
     return saturate(0.5-pixelDist);
-    return saturate(0.5 - dist);
 }
 
 #endif

Assets/Shaders/HSL.cginc

@@ -0,0 +1,11 @@
+#ifndef HSL_INCLUDED
+#define HSL_INCLUDED
+
+inline float3 HSL2RGB(float3 hsl) {
+    int3 n = int3(0, 8, 4);
+    float3 k = (n + hsl.x * 12) % 12;
+    float a = hsl.y * min(hsl.z, 1 - hsl.z);
+    return hsl.z - a * max(-1, min(k - 3, min(9 - k, 1)));
+}
+
+#endif

Assets/Shaders/HSLSlider.shader

@@ -0,0 +1,99 @@
+Shader "ConformalDecals/UI/HSLSlider"
+{
+    Properties
+    {
+        _StencilComp ("Stencil Comparison", Float) = 8
+        _Stencil ("Stencil ID", Float) = 0
+        _StencilOp ("Stencil Operation", Float) = 0
+        _StencilWriteMask ("Stencil Write Mask", Float) = 255
+        _StencilReadMask ("Stencil Read Mask", Float) = 255
+
+        _ColorMask ("Color Mask", Float) = 15
+
+        [Toggle(UNITY_UI_ALPHACLIP)] _UseUIAlphaClip ("Use Alpha Clip", Float) = 0
+    }
+    SubShader
+    {
+        Tags
+        {
+            "Queue"="Transparent"
+            "IgnoreProjector"="True"
+            "RenderType"="Transparent"
+            "PreviewType"="Plane"
+            "CanUseSpriteAtlas"="True"
+        }
+        Stencil
+        {
+            Ref [_Stencil]
+            Comp [_StencilComp]
+            Pass [_StencilOp]
+            ReadMask [_StencilReadMask]
+            WriteMask [_StencilWriteMask]
+        }
+        
+        Cull Off
+        Lighting Off
+        ZWrite Off
+        ZTest [unity_GUIZTestMode]
+        Blend SrcAlpha OneMinusSrcAlpha
+        ColorMask [_ColorMask]
+        
+        Pass
+        {
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+
+            #pragma require integers
+            
+            #include "UnityCG.cginc"
+            #include "UnityUI.cginc"
+            #include "HSL.cginc"
+            
+            #pragma multi_compile_local _ UNITY_UI_CLIP_RECT
+            #pragma multi_compile_local _ UNITY_UI_ALPHACLIP
+            
+            float4 _ClipRect;
+
+            struct appdata
+            {
+                float4 vertex : POSITION;
+                float2 uv : TEXCOORD0;
+            };
+
+            struct v2f
+            {
+                float4 vertex : SV_POSITION;
+                float2 uv : TEXCOORD0;
+                float4 worldPosition : TEXCOORD1;
+            };
+
+            v2f vert (appdata v)
+            {
+                v2f o;
+                o.vertex = UnityObjectToClipPos(v.vertex);
+                o.worldPosition = v.vertex;
+                o.uv = v.uv;
+                return o;
+            }
+            
+            fixed4 frag (v2f i) : SV_Target
+            {
+                // sample the texture
+                fixed4 color = 1;
+                color.rgb = HSL2RGB(float3(i.uv.y, 1, 0.5));
+                
+                #ifdef UNITY_UI_CLIP_RECT
+                    color.a *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect);
+                #endif
+
+                #ifdef UNITY_UI_ALPHACLIP
+                    clip (color.a - 0.001);
+                #endif
+                
+                return color;
+            }
+            ENDCG
+        }
+    }
+}

Assets/Shaders/HSLSquare.shader

@@ -0,0 +1,102 @@
+Shader "ConformalDecals/UI/HSLSquare"
+{
+    Properties
+    {
+        _Hue("Hue", Range(0,1)) = 0
+        
+        _StencilComp ("Stencil Comparison", Float) = 8
+        _Stencil ("Stencil ID", Float) = 0
+        _StencilOp ("Stencil Operation", Float) = 0
+        _StencilWriteMask ("Stencil Write Mask", Float) = 255
+        _StencilReadMask ("Stencil Read Mask", Float) = 255
+
+        _ColorMask ("Color Mask", Float) = 15
+
+        [Toggle(UNITY_UI_ALPHACLIP)] _UseUIAlphaClip ("Use Alpha Clip", Float) = 0
+    }
+    SubShader
+    {
+        Tags
+        {
+            "Queue"="Transparent"
+            "IgnoreProjector"="True"
+            "RenderType"="Transparent"
+            "PreviewType"="Plane"
+            "CanUseSpriteAtlas"="True"
+        }
+        Stencil
+        {
+            Ref [_Stencil]
+            Comp [_StencilComp]
+            Pass [_StencilOp]
+            ReadMask [_StencilReadMask]
+            WriteMask [_StencilWriteMask]
+        }
+        
+        Cull Off
+        Lighting Off
+        ZWrite Off
+        ZTest [unity_GUIZTestMode]
+        Blend SrcAlpha OneMinusSrcAlpha
+        ColorMask [_ColorMask]
+        
+        Pass
+        {
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+
+            #pragma require integers
+
+            #include "UnityCG.cginc"
+            #include "UnityUI.cginc"
+            #include "HSL.cginc"
+            
+            #pragma multi_compile_local _ UNITY_UI_CLIP_RECT
+            #pragma multi_compile_local _ UNITY_UI_ALPHACLIP
+            
+            float _Hue;
+            float4 _ClipRect;
+
+            struct appdata
+            {
+                float4 vertex : POSITION;
+                float2 uv : TEXCOORD0;
+            };
+
+            struct v2f
+            {
+                float4 vertex : SV_POSITION;
+                float2 uv : TEXCOORD0;
+                float4 worldPosition : TEXCOORD1;
+            };
+
+            v2f vert (appdata v)
+            {
+                v2f o;
+                o.vertex = UnityObjectToClipPos(v.vertex);
+                o.worldPosition = v.vertex;
+                o.uv = v.uv;
+                return o;
+            }
+            
+            fixed4 frag (v2f i) : SV_Target
+            {
+                // sample the texture
+                fixed4 color = 1;
+                color.rgb = HSL2RGB(float3(_Hue, i.uv.x, i.uv.y));
+                
+                #ifdef UNITY_UI_CLIP_RECT
+                    color.a *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect);
+                #endif
+
+                #ifdef UNITY_UI_ALPHACLIP
+                    clip (color.a - 0.001);
+                #endif
+                
+                return color;
+            }
+            ENDCG
+        }
+    }
+}