/usr/share/kde4/apps/kwin/shaders/1.40/lookingglass.frag is in kde-window-manager-common 4:4.11.8-0ubuntu6.
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 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | #version 140
uniform sampler2D sampler;
uniform vec2 u_cursor;
uniform float u_zoom;
uniform float u_radius;
uniform vec2 u_textureSize;
in vec2 varyingTexCoords;
out vec4 fragColor;
#define PI 3.14159
void main()
{
vec2 d = u_cursor - varyingTexCoords;
float dist = sqrt(d.x*d.x + d.y*d.y);
vec2 texcoord = varyingTexCoords;
if (dist < u_radius) {
float disp = sin(dist / u_radius * PI) * (u_zoom - 1.0) * 20.0;
texcoord += d / dist * disp;
}
texcoord = texcoord/u_textureSize;
texcoord.t = 1.0 - texcoord.t;
fragColor = texture(sampler, texcoord);
}
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