// Upgrade NOTE: upgraded instancing buffer 'Props' to new syntax.

// Toony Colors Pro+Mobile 2
// (c) 2014-2018 Jean Moreno

Shader "Toony Colors Pro 2/User/2DToon"
{
    Properties
    {
    [TCP2HeaderHelp(BASE, Base Properties)]
        //TOONY COLORS
        _Color ("Color", Color) = (1,1,1,1)
        _HColor ("Highlight Color", Color) = (0.785,0.785,0.785,1.0)
        _SColor ("Shadow Color", Color) = (0.195,0.195,0.195,1.0)

        //DIFFUSE
        _MainTex ("Main Texture", 2D) = "white" {}
    [TCP2Separator]

        //TOONY COLORS RAMP
        [TCP2Header(RAMP SETTINGS)]

        _RampThreshold ("Ramp Threshold", Range(0,1)) = 0.5
        _RampSmooth ("Ramp Smoothing", Range(0.001,1)) = 0.1
    [TCP2Separator]

    [TCP2HeaderHelp(NORMAL MAPPING, Normal Bump Map)]
        //BUMP
        _BumpMap ("Normal map (RGB)", 2D) = "bump" {}
    [TCP2Separator]

    [TCP2HeaderHelp(TRANSPARENCY)]
        //Alpha Testing
        _Cutoff ("Alpha cutoff", Range(0,1)) = 0.5
    [TCP2Separator]


        //Avoid compile error if the properties are ending with a drawer
        [HideInInspector] __dummy__ ("unused", Float) = 0
    }

    SubShader
    {

        Tags {"Queue"="AlphaTest" "IgnoreProjector"="True" "RenderType"="TransparentCutout"}
        Cull Off

        CGPROGRAM

        #pragma surface surf ToonyColorsCustom  exclude_path:deferred exclude_path:prepass
        #pragma target 3.0

        //================================================================
        // VARIABLES

        fixed4 _Color;
        sampler2D _MainTex;
        sampler2D _BumpMap;
        fixed _Cutoff;

        struct Input
        {
            half2 uv_MainTex;
            half2 uv_BumpMap;
        };

        //================================================================
        // CUSTOM LIGHTING

        //Lighting-related variables
        fixed4 _HColor;
        fixed4 _SColor;
        half _RampThreshold;
        half _RampSmooth;

        // Instancing support for this shader. You need to check 'Enable Instancing' on materials that use the shader.
        // See https://docs.unity3d.com/Manual/GPUInstancing.html for more information about instancing.
        // #pragma instancing_options assumeuniformscaling
        UNITY_INSTANCING_BUFFER_START(Props)
            // put more per-instance properties here
        UNITY_INSTANCING_BUFFER_END(Props)

        //Custom SurfaceOutput
        struct SurfaceOutputCustom
        {
            half atten;
            fixed3 Albedo;
            fixed3 Normal;
            fixed3 Emission;
            half Specular;
            fixed Gloss;
            fixed Alpha;
        };

        inline half4 LightingToonyColorsCustom (inout SurfaceOutputCustom s, half3 viewDir, UnityGI gi)
        {
        #define IN_NORMAL s.Normal

            half3 lightDir = gi.light.dir;
        #if defined(UNITY_PASS_FORWARDBASE)
            half3 lightColor = _LightColor0.rgb;
            half atten = s.atten;
        #else
            half3 lightColor = gi.light.color.rgb;
            half atten = 1;
        #endif

            IN_NORMAL = normalize(IN_NORMAL);
            fixed ndl = max(0, dot(IN_NORMAL, lightDir));
            #define NDL ndl

            #define     RAMP_THRESHOLD  _RampThreshold
            #define     RAMP_SMOOTH     _RampSmooth

            fixed3 ramp = smoothstep(RAMP_THRESHOLD - RAMP_SMOOTH*0.5, RAMP_THRESHOLD + RAMP_SMOOTH*0.5, NDL);
        #if !(POINT) && !(SPOT)
            ramp *= atten;
        #endif
        #if !defined(UNITY_PASS_FORWARDBASE)
            _SColor = fixed4(0,0,0,1);
        #endif
            _SColor = lerp(_HColor, _SColor, _SColor.a);    //Shadows intensity through alpha
            ramp = lerp(_SColor.rgb, _HColor.rgb, ramp);
            fixed4 c;
            c.rgb = s.Albedo * lightColor.rgb * ramp;
            c.a = s.Alpha;

        #ifdef UNITY_LIGHT_FUNCTION_APPLY_INDIRECT
            c.rgb += s.Albedo * gi.indirect.diffuse;
        #endif

            return c;
        }

        void LightingToonyColorsCustom_GI(inout SurfaceOutputCustom s, UnityGIInput data, inout UnityGI gi)
        {
            gi = UnityGlobalIllumination(data, 1.0, IN_NORMAL);

            s.atten = data.atten;   //transfer attenuation to lighting function
            gi.light.color = _LightColor0.rgb;  //remove attenuation
        }

        //================================================================
        // SURFACE FUNCTION

        void surf(Input IN, inout SurfaceOutputCustom o)
        {
            fixed4 mainTex = tex2D(_MainTex, IN.uv_MainTex);
            o.Albedo = mainTex.rgb * _Color.rgb;
            o.Alpha = mainTex.a * _Color.a;

            //Cutout (Alpha Testing)
            clip (o.Alpha - _Cutoff);

            //Normal map
            half4 normalMap = tex2D(_BumpMap, IN.uv_BumpMap.xy);
            o.Normal = UnpackNormal(normalMap);
        }

        ENDCG
    }

    Fallback "Diffuse"
    CustomEditor "TCP2_MaterialInspector_SG"
}