// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'

Shader "Outlined/Silhouetted Diffuse" {
    Properties{
        _Color("Main Color", Color) = (1,1,1,1)
        _OutlineColor("Outline Color", Color) = (1,0,0,1)  //改变这个能改变轮廓边的颜色  
        _Outline("Outline width", Range(0.0, 0.03)) = 0.0008   //改变这个能改变轮廓边的粗细  
        _MainTex("Base (RGB)", 2D) = "white" { }
    }

        CGINCLUDE
#include "UnityCG.cginc"  

        struct appdata {
        float4 vertex : POSITION;
        float3 normal : NORMAL;
    };

    struct v2f {
        float4 pos : POSITION;
        float4 color : COLOR;
    };

    uniform float _Outline;
    uniform float4 _OutlineColor;

    v2f vert(appdata v) {
        // just make a copy of incoming vertex data but scaled according to normal direction  
        v2f o;
        o.pos = UnityObjectToClipPos(v.vertex);

        float3 norm = mul((float3x3)UNITY_MATRIX_IT_MV, v.normal);
        float2 offset = TransformViewToProjection(norm.xy);

        o.pos.xy += offset * o.pos.z * _Outline;
        o.color = _OutlineColor;
        return o;
    }
    ENDCG

        SubShader{
            Tags { "Queue" = "Transparent" }

            // note that a vertex shader is specified here but its using the one above  
            Pass {
                Name "OUTLINE"
                Tags { "LightMode" = "Always" }
                Cull Off
                ZWrite Off
                ZTest Always
                ColorMask RGB // alpha not used  

                // you can choose what kind of blending mode you want for the outline  
                Blend SrcAlpha OneMinusSrcAlpha // Normal  
                //Blend One One // Additive  
                //Blend One OneMinusDstColor // Soft Additive  
                //Blend DstColor Zero // Multiplicative  
                //Blend DstColor SrcColor // 2x Multiplicative  

    CGPROGRAM
    #pragma vertex vert  
    #pragma fragment frag  

    half4 frag(v2f i) :COLOR {
        return i.color;
    }
    ENDCG
            }
            Pass {
                Name "BASE"
                ZWrite On
                ZTest LEqual
                Blend SrcAlpha OneMinusSrcAlpha
                Material {
                    Diffuse[_Color]
                    Ambient[_Color]
                }
                Lighting On
                SetTexture[_MainTex] {
                    ConstantColor[_Color]
                    Combine texture * constant
                }
                SetTexture[_MainTex] {
                    Combine previous * primary DOUBLE
                }
            }
    }

        SubShader{
            Tags { "Queue" = "Transparent" }

            Pass {
                Name "OUTLINE"
                Tags { "LightMode" = "Always" }
                Cull Front
                ZWrite Off
                ZTest Always
                ColorMask RGB

        // you can choose what kind of blending mode you want for the outline  
        Blend SrcAlpha OneMinusSrcAlpha // Normal  
        //Blend One One // Additive  
        //Blend One OneMinusDstColor // Soft Additive  
        //Blend DstColor Zero // Multiplicative  
        //Blend DstColor SrcColor // 2x Multiplicative  

        CGPROGRAM
        #pragma vertex vert  
        #pragma exclude_renderers gles xbox360 ps3  
        ENDCG
        SetTexture[_MainTex] { combine primary }
    }

    Pass {
        Name "BASE"
        ZWrite On
        ZTest LEqual
        Blend SrcAlpha OneMinusSrcAlpha
        Material {
            Diffuse[_Color]
            Ambient[_Color]
        }
        Lighting On
        SetTexture[_MainTex] {
            ConstantColor[_Color]
            Combine texture * constant
        }
        SetTexture[_MainTex] {
            Combine previous * primary DOUBLE
        }
    }
    }
}