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optimize mat3 scalar inv

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Recep Aslantas
2024-03-29 20:59:54 +03:00
parent edfb5e3984
commit 30b4ea80a9
1 changed files with 13 additions and 15 deletions
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28
include/cglm/mat3.h
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@@ -334,7 +334,7 @@ glm_mat3_det(mat3 mat) {
d = mat[1][0], e = mat[1][1], f = mat[1][2],
g = mat[2][0], h = mat[2][1], i = mat[2][2];
return a * (e * i - h * f) - d * (b * i - c * h) + g * (b * f - c * e);
return a * (e * i - h * f) - d * (b * i - h * c) + g * (b * f - e * c);
}
/*!
@@ -346,24 +346,22 @@ glm_mat3_det(mat3 mat) {
CGLM_INLINE
void
glm_mat3_inv(mat3 mat, mat3 dest) {
float det;
float a = mat[0][0], b = mat[0][1], c = mat[0][2],
d = mat[1][0], e = mat[1][1], f = mat[1][2],
g = mat[2][0], h = mat[2][1], i = mat[2][2];
g = mat[2][0], h = mat[2][1], i = mat[2][2],
dest[0][0] = e * i - f * h;
dest[0][1] = -(b * i - h * c);
dest[0][2] = b * f - e * c;
dest[1][0] = -(d * i - g * f);
dest[1][1] = a * i - c * g;
dest[1][2] = -(a * f - d * c);
dest[2][0] = d * h - g * e;
dest[2][1] = -(a * h - g * b);
dest[2][2] = a * e - b * d;
c1 = e * i - f * h, c2 = d * i - g * f, c3 = d * h - g * e,
idt = 1.0f / (a * c1 - b * c2 + c * c3), ndt = -idt;
det = 1.0f / (a * dest[0][0] + b * dest[1][0] + c * dest[2][0]);
glm_mat3_scale(dest, det);
dest[0][0] = idt * c1;
dest[0][1] = ndt * (b * i - h * c);
dest[0][2] = idt * (b * f - e * c);
dest[1][0] = ndt * c2;
dest[1][1] = idt * (a * i - g * c);
dest[1][2] = ndt * (a * f - d * c);
dest[2][0] = idt * c3;
dest[2][1] = ndt * (a * h - g * b);
dest[2][2] = idt * (a * e - d * b);
}
/*!