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[gatest] Fix up layout issues for null vectors

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e0 is created only if there are null vectors in the algebra, and the 3d
and 2d basis groups have been rearranged to compensate in the changed
ordering in the basis blade array.
This commit is contained in:
Bill Currie 2023-06-08 22:13:23 +09:00
parent a40fee2513
commit 0fbcd90e37
1 changed files with 15 additions and 9 deletions
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24
ruamoko/gatest/algebra.r
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@ -33,6 +33,12 @@
for (int i = 0; i < a.num_components; i++) {
int grade = count_bits (i);
int ind = indices[grade]++;
unsigned mask = i;
if (!z) {
// e0 is best for the null vector, but this geometry has no null
// vectors, so skip it;
mask <<= 1;
}
blades[ind] = [BasisBlade basis:i];
}
@ -47,13 +53,13 @@
// 3d PGA (w squares to 0, x y z square to +1):
// : x y z w
// : yz zx xy 1
// : xw yw zw xyzw
// : zyw xzw yxw xyz
// : wx wy wz wxyz
// : wzy wxz wyx xyz
BasisBlade *pga_blades[16] = {
blades[1], blades[2], blades[3], blades[4],
blades[7], blades[6], blades[5], blades[0],
blades[8], blades[9], blades[10], blades[15],
blades[14], blades[13], blades[12], blades[11],
blades[2], blades[3], blades[4], blades[1],
blades[10], blades[9], blades[7], blades[0],
blades[5], blades[6], blades[8], blades[15],
blades[13], blades[12], blades[11], blades[14],
};
BasisGroup *pga_groups[4] = {
[BasisGroup new:4 basis:pga_blades + 0],
@ -65,10 +71,10 @@
} else if (p == 2 && m == 0 && z == 1) {
// 2d PGA (w squares to 0, x y square to +1):
// : x y w 1
// : yw wx xy xyw
// : yw wx xy wxy
BasisBlade *pga_blades[8] = {
blades[1], blades[2], blades[3], blades[0],
blades[6], blades[5], blades[4], blades[7],
blades[2], blades[3], blades[1], blades[0],
blades[5], blades[4], blades[6], blades[7],
};
BasisGroup *pga_groups[2] = {
[BasisGroup new:4 basis:pga_blades + 0],