/usr/share/kde4/apps/kwin/cube-reflection.glsl is in kde-window-manager-common 4:4.8.2a-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | uniform float u_alpha;
varying vec2 varyingTexCoords;
void main()
{
gl_FragColor = vec4(0.0, 0.0, 0.0, u_alpha*varyingTexCoords.s);
}
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