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Add Mat4as3MultVec.

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to transform a vertex without the translation (eg, for normals) without
having to have separate matrices.
This commit is contained in:
Bill Currie 2012-05-20 15:20:18 +09:00
parent 0fbaa2a88a
commit b5add680f7
2 changed files with 12 additions and 0 deletions
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1
include/QF/mathlib.h
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@ -632,6 +632,7 @@ void Mat4Transpose (const mat4_t a, mat4_t b);
int Mat4Inverse (const mat4_t a, mat4_t b);
void Mat4Mult (const mat4_t a, const mat4_t b, mat4_t c);
void Mat4MultVec (const mat4_t a, const vec3_t b, vec3_t c);
void Mat4as3MultVec (const mat4_t a, const vec3_t b, vec3_t c);
/** Decompose a column major matrix into its component transformations.
This gives the matrix's rotation as a quaternion, shear, scale

11
libs/util/mathlib.c
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@ -920,6 +920,17 @@ Mat4MultVec (const mat4_t a, const vec3_t b, vec3_t c)
c[i] = a[i + 0] * tb[0] + a[i + 4] * b[1] + a[i + 8] * b[2] + a[i +12];
}
void
Mat4as3MultVec (const mat4_t a, const vec3_t b, vec3_t c)
{
int i;
vec3_t tb;
VectorCopy (b, tb);
for (i = 0; i < 3; i++)
c[i] = a[i + 0] * tb[0] + a[i + 4] * b[1] + a[i + 8] * b[2];
}
int
Mat4Decompose (const mat4_t mat, quat_t rot, vec3_t shear, vec3_t scale,
vec3_t trans)