This file is indexed.

/usr/share/gazebo-9/media/materials/programs/depth_map.vert is in gazebo9-common 9.0.0+dfsg5-3ubuntu1.

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 vec4 texelOffsets;

varying float depth;

void main()
{
  gl_Position = ftransform();
  gl_Position.xy += texelOffsets.zw * gl_Position.w;
  //depth = -(gl_ModelViewMatrix * gl_Vertex).z; // ???
  depth = gl_Position.w; // copied from old gazebo
}