/usr/share/openmsx/shaders/fill.frag is in openmsx-data 0.12.0-1build1.
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 | varying vec4 v_color;
void main()
{
gl_FragColor = v_color;
}
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