This file is indexed.

/usr/share/fs-uae/shaders/curvature.shader is in fs-uae 2.4.1+ds-3.

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

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<shader language="GLSL">
  <fragment filter="linear"><![CDATA[
    uniform sampler2D rubyTexture;
    uniform vec2 rubyInputSize;
    uniform vec2 rubyTextureSize;

    // Tweak this parameter for more / less distortion
    #define distortion 0.2

    vec2 radialDistortion(vec2 coord) {
      coord *= rubyTextureSize / rubyInputSize;
      vec2 cc = coord - vec2(0.5);
      float dist = dot(cc, cc) * distortion;
      return (coord + cc * (1.0 + dist) * dist) * rubyInputSize / rubyTextureSize;
    }

    void main(void) {
      gl_FragColor = texture2D(rubyTexture, radialDistortion(gl_TexCoord[0].xy));
    }
  ]]></fragment>
</shader>