/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.
1 2 3 4 5 6 7 8 9 10 11 | 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);
}
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