blur shader (built-in PR)
2023. 6. 14. 17:50ㆍUnity/Shader
Shader "Custom/Blur"
{
Properties
{
_MainTex("Texture", 2D) = "white" {}
_Blur("Blur", Float) = 10
}
SubShader
{
Tags{ "Queue" = "Transparent" }
GrabPass
{
}
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
struct appdata
{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
fixed4 color : COLOR;
};
struct v2f
{
float4 grabPos : TEXCOORD0;
float4 pos : SV_POSITION;
float4 vertColor : COLOR;
};
v2f vert(appdata v)
{
v2f o;
o.pos = UnityObjectToClipPos(v.vertex);
o.grabPos = ComputeGrabScreenPos(o.pos);
o.vertColor = v.color;
return o;
}
sampler2D _GrabTexture;
fixed4 _GrabTexture_TexelSize;
float _Blur;
half4 frag(v2f i) : SV_Target
{
float blur = _Blur;
blur = max(1, blur);
fixed4 col = fixed4(0, 0, 0, 0);
float weight_total = 0;
[loop]
for (float x = -blur; x <= blur; x += 1)
{
float distance_normalized = abs(x / blur);
float weight = exp(-0.5 * pow(distance_normalized, 2) * 5.0);
weight_total += weight;
col += tex2Dproj(_GrabTexture, i.grabPos + float4(x * _GrabTexture_TexelSize.x, 0, 0, 0)) * weight;
}
col /= weight_total;
return col;
}
ENDCG
}
GrabPass
{
}
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
struct appdata
{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
fixed4 color : COLOR;
};
struct v2f
{
float4 grabPos : TEXCOORD0;
float4 pos : SV_POSITION;
float4 vertColor : COLOR;
};
v2f vert(appdata v)
{
v2f o;
o.pos = UnityObjectToClipPos(v.vertex);
o.grabPos = ComputeGrabScreenPos(o.pos);
o.vertColor = v.color;
return o;
}
sampler2D _GrabTexture;
fixed4 _GrabTexture_TexelSize;
float _Blur;
half4 frag(v2f i) : SV_Target
{
float blur = _Blur;
blur = max(1, blur);
fixed4 col = fixed4(0, 0, 0, 0);
float weight_total = 0;
[loop]
for (float y = -blur; y <= blur; y += 1)
{
float distance_normalized = abs(y / blur);
float weight = exp(-0.5 * pow(distance_normalized, 2) * 5.0);
weight_total += weight;
col += tex2Dproj(_GrabTexture, i.grabPos + float4(0, y * _GrabTexture_TexelSize.y, 0, 0)) * weight;
}
col /= weight_total;
return col;
}
ENDCG
}
}
}