Smoothing（平滑化）

画像の注目点から 8 近傍画素を使って平滑化する。
他の平滑化に関しては関連ブログ参照。
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precision highp float;
varying vec2 uv;
uniform sampler2D t;
uniform vec2 resolution;
vec4 textureBlur(){
    vec2 lr=vec2(1,0)/resolution;
    vec2 tb=vec2(0,1)/resolution;
    vec4 color=vec4(0);
    color+=texture2D(t,uv);
    color+=texture2D(t,uv+lr);
    color+=texture2D(t,uv-lr);
    color+=texture2D(t,uv+tb);
    color+=texture2D(t,uv-tb);
    color+=texture2D(t,uv+lr+tb);
    color+=texture2D(t,uv+lr-tb);
    color+=texture2D(t,uv-lr+tb);
    color+=texture2D(t,uv-lr-tb);
    return vec4(color.rgb/color.w,1);
}
void main(){
    gl_FragColor=textureBlur();
}
 
 
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