koobas.hobune.stream
2D Glow Shader
How to fixed Square to limit shader effect
Shader "Custom/BlurBox"
{
Properties
{
_MainTex ("Base (RGB), Alpha (A)", 2D) = "black" {}
_TexSize("Texture Size", vector) = (256,256,0,0)
_BlurOffset("Blur Offset", Range(1, 10)) = 1
}
SubShader
{
LOD 200
Tags
{
"Queue" = "Transparent"
"IgnoreProjector" = "True"
"RenderType" = "Transparent"
}
Pass
{
Cull Off
Lighting Off
ZWrite Off
Fog { Mode Off }
Offset -1, -1
Blend SrcAlpha OneMinusSrcAlpha
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
sampler2D _MainTex;
float4 _TexSize;
fixed _BlurOffset;
float4 _MainTex_ST;
struct appdata_t
{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
fixed4 color : COLOR;
};
struct v2f
{
float4 vertex : SV_POSITION;
half2 uv : TEXCOORD0;
fixed4 color : COLOR;
};
v2f vert (appdata_t v)
{
v2f o;
o.vertex = UnityObjectToClipPos(v.vertex);
o.uv = v.uv;
o.color = v.color;
return o;
}
//对图像做滤波操作
float4 filter(float3x3 filter, sampler2D tex, float2 coord, float2 texSize)
{
float4 outCol = float4(0,0,0,0);
for (int i = 0; i < 3; i++)
{
for (int j = 0; j < 3; j++)
{
//计算采样点，得到当前像素附近的像素的坐标
float2 newCoord = float2(coord.x + (i-1)*_BlurOffset, coord.y + (j-1)*_BlurOffset);
float2 newUV = float2(newCoord.x / texSize.x, newCoord.y / texSize.y);
//采样并乘以滤波器权重，然后累加
outCol += tex2D(tex, newUV) * filter[i][j];
}
}
return outCol;
}
fixed4 frag (v2f IN) : COLOR
{
float3x3 boxFilter =
{
1.0f/9, 1.0f/9, 1.0f/9,
1.0f/9, 1.0f/9, 1.0f/9,
1.0f/9, 1.0f/9, 1.0f/9,
};
float2 coord = float2(IN.uv.x * _TexSize.x, IN.uv.y * _TexSize.y);
return filter(boxFilter, _MainTex, coord, _TexSize);
}
ENDCG
}
}
SubShader
{
LOD 100
Tags
{
"Queue" = "Transparent"
"IgnoreProjector" = "True"
"RenderType" = "Transparent"
}
Pass
{
Cull Off
Lighting Off
ZWrite Off
Fog { Mode Off }
Offset -1, -1
ColorMask RGB
Blend SrcAlpha OneMinusSrcAlpha
ColorMaterial AmbientAndDiffuse
SetTexture [_MainTex]
{
Combine Texture * Primary
}
}
}
}
