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

// Shader created with Shader Forge v1.26 
// Shader Forge (c) Neat Corporation / Joachim Holmer - http://www.acegikmo.com/shaderforge/
// Note: Manually altering this data may prevent you from opening it in Shader Forge
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Shader "Rhino/A3_SimpleDistortion" {
    Properties {
        _Refraction ("Refraction", 2D) = "white" {}
        _RefractionIntensity ("Refraction Intensity", Range(0, 1)) = 1
        [HideInInspector]_Cutoff ("Alpha cutoff", Range(0,1)) = 0.5
    }
    SubShader {
        Tags {
            "IgnoreProjector"="True"
            "Queue"="Transparent"
            "RenderType"="Transparent"
        }
        LOD 200
        GrabPass{ }
        Pass {
            Name "FORWARD"
            Tags {
                "LightMode"="ForwardBase"
            }
            Blend One OneMinusSrcAlpha
            Cull Off
            ZWrite Off
            
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #define UNITY_PASS_FORWARDBASE
            #include "UnityCG.cginc"
            #pragma multi_compile_fwdbase
            #pragma exclude_renderers xbox360 ps3 
            #pragma target 3.0
            uniform sampler2D _GrabTexture;
            uniform sampler2D _Refraction; uniform float4 _Refraction_ST;
            uniform float _RefractionIntensity;
            struct VertexInput {
                float4 vertex : POSITION;
                float2 texcoord0 : TEXCOORD0;
                float4 vertexColor : COLOR;
            };
            struct VertexOutput {
                float4 pos : SV_POSITION;
                float2 uv0 : TEXCOORD0;
                float4 screenPos : TEXCOORD1;
                float4 vertexColor : COLOR;
            };
            VertexOutput vert (VertexInput v) {
                VertexOutput o = (VertexOutput)0;
                o.uv0 = v.texcoord0;
                o.vertexColor = v.vertexColor;
                o.pos = UnityObjectToClipPos(v.vertex );
                o.screenPos = o.pos;
                return o;
            }
            float4 frag(VertexOutput i, float facing : VFACE) : COLOR {
                float isFrontFace = ( facing >= 0 ? 1 : 0 );
                float faceSign = ( facing >= 0 ? 1 : -1 );
                #if UNITY_UV_STARTS_AT_TOP
                    float grabSign = -_ProjectionParams.x;
                #else
                    float grabSign = _ProjectionParams.x;
                #endif
                i.screenPos = float4( i.screenPos.xy / i.screenPos.w, 0, 0 );
                i.screenPos.y *= _ProjectionParams.x;
                float4 _Refraction_var = tex2D(_Refraction,TRANSFORM_TEX(i.uv0, _Refraction));
                float2 sceneUVs = float2(1,grabSign)*i.screenPos.xy*0.5+0.5 + (_Refraction_var.rgb.rg*i.vertexColor.a*_RefractionIntensity);
                float4 sceneColor = tex2D(_GrabTexture, sceneUVs);
////// Lighting:
////// Emissive:
                float3 emissive = (_Refraction_var.rgb*i.vertexColor.rgb);
                float3 finalColor = emissive;
                return fixed4(lerp(sceneColor.rgb, finalColor,(_Refraction_var.rgb*i.vertexColor.a)),1);
            }
            ENDCG
        }
    }
    FallBack "Diffuse"
    CustomEditor "ShaderForgeMaterialInspector"
}