/usr/share/celestia/shaders/bumpdiffuse.vp is in celestia-common 1.6.1+dfsg-3.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Compute the surface space light vectors for diffuse bump mapping
# c[0]..c[3] contains the concatenation of the modelview and projection matrices.
# c[4]..c[7] contains the inverse transpose of the modelview
# c[15] contains the eye position in object space
# c[16] contains the light direction in object space
# c[17] contains H, the normalized sum of the eye and light direction
# c[20] contains the light color * object color
# c[32] contains the ambient light color * object color
# c[33] contains the haze color
# c[40] contains (0, 1, 0.5, specPower)
# v[6] contains the tangent vector
# 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 R1, v[NRML];
MOV R2, v[6];
# Compute the binormal--cross product of normal and tangent
MUL R3, R1.zxyw, R2.yzxw;
MAD R3, R1.yzxw, R2.zxyw, -R3;
# Assume that the tangent and normal are orthonormal; otherwise
# we need to normalize R3
#DP3 R0.w, R3, R3;
#RSQ R0.w, R0.w;
#MUL R3.xyz, R3, R0.w;
# Transform the light direction from object space into surface space
DP3 R0.x, R2, c[16];
DP3 R0.y, -R3, c[16];
DP3 R0.z, R1, c[16];
# Compress the light direction to fit in the primary color and output it
MOV R5, c[40];
MAD o[COL0], R0, R5.z, R5.z;
# Output the texture coordinates. Use different coordinates for
# the decal (texture 0) and the bump map (texture 1)
MOV o[TEX0], v[TEX0];
MOV o[TEX1], v[TEX1];
END
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