//////////////////////////////////////////////
/// 2DxFX v3 - by VETASOFT 2018 //
//////////////////////////////////////////////


//////////////////////////////////////////////

Shader "2DxFX_Extra_Shaders/InnerGlow"
{
Properties
{
[PerRendererData] _MainTex("Sprite Texture", 2D) = "white" {}
_InnerGlowHQ_Intensity_1("_InnerGlowHQ_Intensity_1", Range(1, 16)) = 6.457
_InnerGlowHQ_Size_1("_InnerGlowHQ_Size_1", Range(1, 16)) = 1.114
_InnerGlowHQ_Color_1("_InnerGlowHQ_Color_1", COLOR) = (1,1,0,1)
_SpriteFade("SpriteFade", Range(0, 1)) = 1.0

// required for UI.Mask
[HideInInspector]_StencilComp("Stencil Comparison", Float) = 8
[HideInInspector]_Stencil("Stencil ID", Float) = 0
[HideInInspector]_StencilOp("Stencil Operation", Float) = 0
[HideInInspector]_StencilWriteMask("Stencil Write Mask", Float) = 255
[HideInInspector]_StencilReadMask("Stencil Read Mask", Float) = 255
[HideInInspector]_ColorMask("Color Mask", Float) = 15

}

SubShader
{

Tags {"Queue" = "Transparent" "IgnoreProjector" = "true" "RenderType" = "Transparent" "PreviewType"="Plane" "CanUseSpriteAtlas"="True" }
ZWrite Off Blend SrcAlpha OneMinusSrcAlpha Cull Off

// required for UI.Mask
Stencil
{
Ref [_Stencil]
Comp [_StencilComp]
Pass [_StencilOp]
ReadMask [_StencilReadMask]
WriteMask [_StencilWriteMask]
}

Pass
{

CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma fragmentoption ARB_precision_hint_fastest
#include "UnityCG.cginc"

struct appdata_t{
float4 vertex   : POSITION;
float4 color    : COLOR;
float2 texcoord : TEXCOORD0;
};

struct v2f
{
float2 texcoord  : TEXCOORD0;
float4 vertex   : SV_POSITION;
float4 color    : COLOR;
};

sampler2D _MainTex;
float _SpriteFade;
float _InnerGlowHQ_Intensity_1;
float _InnerGlowHQ_Size_1;
float4 _InnerGlowHQ_Color_1;

v2f vert(appdata_t IN)
{
v2f OUT;
OUT.vertex = UnityObjectToClipPos(IN.vertex);
OUT.texcoord = IN.texcoord;
OUT.color = IN.color;
return OUT;
}


float InnerGlowAlpha(sampler2D source, float2 uv)
{
return (1 - tex2D(source, uv).a);
}
float4 InnerGlow(float2 uv, sampler2D source, float Intensity, float size, float4 color)
{
float step1 = 0.00390625f * size*2;
float step2 = step1 * 2;
float4 result = float4 (0, 0, 0, 0);
float2 texCoord = float2(0, 0);
texCoord = uv + float2(-step2, -step2); result += InnerGlowAlpha(source, texCoord);
texCoord = uv + float2(-step1, -step2); result += 4.0 * InnerGlowAlpha(source, texCoord);
texCoord = uv + float2(0, -step2); result += 6.0 * InnerGlowAlpha(source, texCoord);
texCoord = uv + float2(step1, -step2); result += 4.0 * InnerGlowAlpha(source, texCoord);
texCoord = uv + float2(step2, -step2); result += InnerGlowAlpha(source, texCoord);
texCoord = uv + float2(-step2, -step1); result += 4.0 * InnerGlowAlpha(source, texCoord);
texCoord = uv + float2(-step1, -step1); result += 16.0 * InnerGlowAlpha(source, texCoord);
texCoord = uv + float2(0, -step1); result += 24.0 * InnerGlowAlpha(source, texCoord);
texCoord = uv + float2(step1, -step1); result += 16.0 * InnerGlowAlpha(source, texCoord);
texCoord = uv + float2(step2, -step1); result += 4.0 * InnerGlowAlpha(source, texCoord);
texCoord = uv + float2(-step2, 0); result += 6.0 * InnerGlowAlpha(source, texCoord);
texCoord = uv + float2(-step1, 0); result += 24.0 * InnerGlowAlpha(source, texCoord);
texCoord = uv; result += 36.0 * InnerGlowAlpha(source, texCoord);
texCoord = uv + float2(step1, 0); result += 24.0 * InnerGlowAlpha(source, texCoord);
texCoord = uv + float2(step2, 0); result += 6.0 * InnerGlowAlpha(source, texCoord);
texCoord = uv + float2(-step2, step1); result += 4.0 * InnerGlowAlpha(source, texCoord);
texCoord = uv + float2(-step1, step1); result += 16.0 * InnerGlowAlpha(source, texCoord);
texCoord = uv + float2(0, step1); result += 24.0 * InnerGlowAlpha(source, texCoord);
texCoord = uv + float2(step1, step1); result += 16.0 * InnerGlowAlpha(source, texCoord);
texCoord = uv + float2(step2, step1); result += 4.0 * InnerGlowAlpha(source, texCoord);
texCoord = uv + float2(-step2, step2); result += InnerGlowAlpha(source, texCoord);
texCoord = uv + float2(-step1, step2); result += 4.0 * InnerGlowAlpha(source, texCoord);
texCoord = uv + float2(0, step2); result += 6.0 * InnerGlowAlpha(source, texCoord);
texCoord = uv + float2(step1, step2); result += 4.0 * InnerGlowAlpha(source, texCoord);
texCoord = uv + float2(step2, step2); result += InnerGlowAlpha(source, texCoord);
result = result*0.00390625;
result = lerp(tex2D(source,uv),color*Intensity,result*color.a);
result.a = tex2D(source, uv).a;
return saturate(result);
}
float4 frag (v2f i) : COLOR
{
float4 _InnerGlowHQ_1 = InnerGlow(i.texcoord,_MainTex,_InnerGlowHQ_Intensity_1,_InnerGlowHQ_Size_1,_InnerGlowHQ_Color_1);
float4 FinalResult = _InnerGlowHQ_1;
FinalResult.rgb *= i.color.rgb;
FinalResult.a = FinalResult.a * _SpriteFade * i.color.a;
return FinalResult;
}

ENDCG
}
}
Fallback "Sprites/Default"
}