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Merge pull request #38 from impiaaa/patch-1

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Partially revert fdbcc0c, rename "cross product" back to "outer product"
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Nicolas Noble 2022-06-29 19:25:35 -07:00 committed by GitHub
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docs/geometrytransformationenginegte.md
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@ -313,7 +313,7 @@ FFFF8900h (negative 16bit).<br/>
0xh - N/A 0xh - N/A
06h NCLIP 8 Normal clipping 06h NCLIP 8 Normal clipping
0xh - N/A 0xh - N/A
0Ch OP(sf) 6 Cross product of 2 vectors 0Ch OP(sf) 6 Outer product of 2 vectors
0xh - N/A 0xh - N/A
10h DPCS 8 Depth Cueing single 10h DPCS 8 Depth Cueing single
11h INTPL 8 Interpolation of a vector and far color vector 11h INTPL 8 Interpolation of a vector and far color vector
@ -374,7 +374,7 @@ sorted by their fake numbers gives a more or less well arranged list:<br/>
14h NCLIP 8 Normal clipping 14h NCLIP 8 Normal clipping
15h AVSZ3 5 Average of three Z values 15h AVSZ3 5 Average of three Z values
16h AVSZ4 6 Average of four Z values 16h AVSZ4 6 Average of four Z values
17h OP(sf) 6 Cross product of 2 vectors 17h OP(sf) 6 Outer product of 2 vectors
18h - N/A 18h - N/A
19h GPF(sf)5 General purpose interpolation 19h GPF(sf)5 General purpose interpolation
1Ah GPL(sf)5 General purpose interpolation with base 1Ah GPL(sf)5 General purpose interpolation with base
@ -488,14 +488,14 @@ matrix (with elements -60h, +60h, IR0, RT13, RT13, RT13, RT22, RT22, RT22).<br/>
Calculates the square of a vector. The result is, of course, always positive, Calculates the square of a vector. The result is, of course, always positive,
so the "lm" flag for negative saturation has no effect.<br/> so the "lm" flag for negative saturation has no effect.<br/>
#### COP2 170000Ch+sf\*80000h - 6 Cycles - OP(sf,lm) - Cross product of 2 vectors #### COP2 170000Ch+sf\*80000h - 6 Cycles - OP(sf,lm) - Outer product of 2 vectors
``` ```
[MAC1,MAC2,MAC3] = [IR3*D2-IR2*D3, IR1*D3-IR3*D1, IR2*D1-IR1*D2] SAR (sf*12) [MAC1,MAC2,MAC3] = [IR3*D2-IR2*D3, IR1*D3-IR3*D1, IR2*D1-IR1*D2] SAR (sf*12)
[IR1,IR2,IR3] = [MAC1,MAC2,MAC3] ;copy result [IR1,IR2,IR3] = [MAC1,MAC2,MAC3] ;copy result
``` ```
Calculates the cross product of two signed 16bit vectors. Note: D1,D2,D3 are Calculates the cross product of two signed 16bit vectors. Note: D1,D2,D3 are
meant to be the RT11,RT22,RT33 elements of the RT matrix "misused" as vector. meant to be the RT11,RT22,RT33 elements of the RT matrix "misused" as vector.
lm should be usually zero. The mnemonic refers to "outer product."<br/> lm should be usually zero.<br/>
#### LZCS/LZCR registers - ? Cycles - Count-Leading-Zeroes/Leading-Ones #### LZCS/LZCR registers - ? Cycles - Count-Leading-Zeroes/Leading-Ones
The LZCS/LZCR registers offer a Count-Leading-Zeroes/Leading-Ones function.<br/> The LZCS/LZCR registers offer a Count-Leading-Zeroes/Leading-Ones function.<br/>