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/usr/share/kwin/shaders/1.40/logout-blur.frag is in kwin-data 4:5.5.5-0ubuntu1.

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#version 140

uniform sampler2D sampler;
uniform float u_alphaProgress;

in vec2 varyingTexCoords;
out vec4 fragColor;

void main() {
    vec4 texel = texture(sampler, varyingTexCoords, 1.75);
    texel.a = u_alphaProgress;

    fragColor = texel;
}