This information is only for the ones of you who are interested and have a bit of programming experience as well as a minimal understanding of 3D math.
These are the instructions:
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Instruction
Parameters
Action
nop
Row 0 - Cell 1
do nothing
mov
dest, src
move
mul
dest, src1, rc2
Set dest to the product of src1 and src2
add
dest, src1, rc2
Add src1 to src2. [And the optional negation creates subtraction]
mad
dest, src1, rc2, rc3
Multiply src1 by src2 and add src3 - into dst
rsq
dest, src
Reciprocal square root of src (much more useful than straight 'square root').dest.x = dest.y = dest.z = dest.w = 1/sqrt(src)
dp3
dest, src1, src2
3 Component dot product
dp4
dest, src1, src2
4 Component dot product
dst
dest, src1, src2
Calculate distance vector. src1 vector is (NA,d*d,d*d,NA) and src2 is (NA,1/d,NA,1/d).dest is set to (1,d,d*d,1/d)
lit
dest, src
Calculates lighting coefficients from two dot products and a power. src is:src.x = n o l (unit normal and light vectors)src.y = n o h (unit normal and halfangle vectors)src.z is unusedsrc.w = power (in range +128 to -128)
These few instructions are already quite powerful. To make the handling easier, NVIDIA added a few more features, 'costless' negation and swizzling...
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