This file is indexed.

/usr/share/games/pink-pony/GLSL/heightmap.vert is in pink-pony-data 1.4.1-2.1.

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

The actual contents of the file can be viewed below.

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varying vec3 eye;
varying vec3 light;
varying vec3 normal; 
varying vec3 world_coord;


void main (void)
{
    normal = gl_NormalMatrix * gl_Normal;

    vec4 light_position = gl_LightSource[0].position;
    light = normalize(light_position.xyz);

    world_coord = gl_Vertex.xyz;
    //gl_ClipVertex = gl_Vertex;
    
    gl_Position = ftransform();

    eye = (gl_ModelViewMatrix * gl_Vertex).xyz;
}