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/usr/share/kwin/shaders/1.40/cube-reflection.glsl is in kwin-data 4:5.5.5-0ubuntu1.

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#version 140
uniform float u_alpha;

in vec2 varyingTexCoords;

out vec4 fragColor;

void main()
{
    fragColor = vec4(0.0, 0.0, 0.0, u_alpha*varyingTexCoords.s);
}