Unity3D-CG-programming/blur.shader at master · ParsGameLab/Unity3D-CG-programming · GitHub

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Shader "Blur"

{

Properties

{

_MainTex ("Texture", 2D) = "black" {}

_radius ("Blur radius", Range (0.01,2.0)) = 0.5

}

SubShader

{

Pass

{

CGPROGRAM

#pragma vertex vertex_shader

#pragma fragment pixel_shader

#pragma target 5.0

float _radius;

sampler2D _MainTex;

float4 _MainTex_TexelSize;

struct structure

{

float4 vertex:SV_POSITION;

float2 uv : TEXCOORD0;

};

void vertex_shader(float4 vertex:POSITION,float2 uv:TEXCOORD0,out structure vs)

{

vs.vertex = UnityObjectToClipPos(vertex);

vs.uv = uv;

}

float4 surface (sampler2D input, float2 uv)

{

return tex2D(input,uv);

}

float3 blur(float2 uv,float radius)

{

float2x2 m = float2x2(-0.736717,0.6762,-0.6762,-0.736717);

float3 total = float3(0.0,0.0,0.0);

float2 s = _MainTex_TexelSize.zw;

float2 texel = float2(0.002*s.x/s.y,0.002);

float2 angle = float2(0.0,radius);

radius = 1.0;

for (int j=0;j<80;j++)

{

radius += rcp(radius); //sm 5.0 fast reciprocal function

angle = mul(angle,m);

float3 color = surface(_MainTex,uv+texel*(radius-1.0)*angle).rgb;

total += color;

}

return total/80.0;

}

void pixel_shader(in structure ps, out float4 fragColor:SV_Target0)

{

float2 uv = ps.uv.xy;

fragColor = float4(blur(uv,_radius),1.0);

}

ENDCG

}

Unity3D-CG-programming/blur.shader at master · ParsGameLab/Unity3D-CG-programming · GitHub

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