/usr/share/games/trackballs/shaders/ui.frag is in trackballs-data 1.2.4-1.
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 | #version 130
#ifdef GL_ES
precision mediump float;
#endif
uniform sampler2D tex;
varying vec4 color;
varying vec2 texco;
void main(void) { gl_FragColor = color * texture(tex, texco); }
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