像素网格描边 Pixel Grid Outline

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shader_type canvas_item;
uniform float size=20.0;
void fragment(){
    vec2 g=fract(UV*size);
    float edge=step(0.95,g.x)+step(0.95,g.y);
    COLOR=mix(texture(TEXTURE,UV),vec4(0,0,0,1),clamp(edge,0.0,1.0));
}