This file is indexed.

/usr/share/sludge/yuv.vert is in sludge-engine 2.2.1-2+b1.

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

The actual contents of the file can be viewed below.

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attribute vec4 myVertex;
attribute vec2 myUV0;

uniform mat4 myPMVMatrix;

varying vec2 varCoord;

void main()
{
	gl_Position = myPMVMatrix * myVertex;
	varCoord = myUV0.st;
}