This file is indexed.

/usr/share/games/marsshooter/shaders/bump.frag is in marsshooter-data 0.7.5-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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uniform sampler2D Texture;
uniform sampler2D BumpMap;

uniform float Exposure;

void main(void) {
    vec2 TexCoord = vec2(gl_TexCoord[0]);
    vec2 distort  = vec2(texture2D(BumpMap, TexCoord).rb) - vec2(0.5f, 0.5f);

    gl_FragColor=vec4(texture2D(Texture, distort*0.02f +  TexCoord)*gl_Color*Exposure);
}