/usr/share/celestia/shaders/simple.vp is in celestia-common 1.6.1+dfsg-3.
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 7 8 9 10 11 12 | !!VP1.0
# c[0]..c[3] contains the concatenation of the modelview and projection matrices.
# Transform the vertex by the modelview matrix
DP4 o[HPOS].x, c[0], v[OPOS];
DP4 o[HPOS].y, c[1], v[OPOS];
DP4 o[HPOS].z, c[2], v[OPOS];
DP4 o[HPOS].w, c[3], v[OPOS];
MOV o[TEX0], v[TEX0];
END
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