/usr/share/kde4/apps/kwin/coverswitch-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 9 | uniform vec4 u_frontColor;
uniform vec4 u_backColor;
varying vec2 varyingTexCoords;
void main()
{
gl_FragColor = u_frontColor*(1.0-varyingTexCoords.s) + u_backColor*varyingTexCoords.s;
}
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