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port math function from Viewport FX 

mul_v4_m4v3(r, M, v) means r = M * vec4(v, 1.0)
Based on rB194998766c65
This commit is contained in:
Mike Erwin 2016-09-25 19:01:18 +02:00
parent 9bea012b8c
commit a731c75442
2 changed files with 10 additions and 0 deletions
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1
source/blender/blenlib/BLI_math_matrix.h
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@ -121,6 +121,7 @@ void mul_mat3_m4_v3(const float M[4][4], float r[3]);
void mul_v3_mat3_m4v3(float r[3], const float M[4][4], const float v[3]);
void mul_m4_v4(const float M[4][4], float r[4]);
void mul_v4_m4v4(float r[4], const float M[4][4], const float v[4]);
void mul_v4_m4v3(float r[4], const float M[4][4], const float v[3]); /* v has implicit w = 1.0f */
void mul_project_m4_v3(const float M[4][4], float vec[3]);
void mul_v3_project_m4_v3(float r[3], const float mat[4][4], const float vec[3]);
void mul_v2_project_m4_v3(float r[2], const float M[4][4], const float vec[3]);

9
source/blender/blenlib/intern/math_matrix.c
View File

@ -623,6 +623,15 @@ void mul_m4_v4d(const float mat[4][4], double r[4])
mul_v4d_m4v4d(r, mat, r);
}
void mul_v4_m4v3(float r[4], const float M[4][4], const float v[3])
{
/* v has implicit w = 1.0f */
r[0] = v[0] * M[0][0] + v[1] * M[1][0] + M[2][0] * v[2] + M[3][0];
r[1] = v[0] * M[0][1] + v[1] * M[1][1] + M[2][1] * v[2] + M[3][1];
r[2] = v[0] * M[0][2] + v[1] * M[1][2] + M[2][2] * v[2] + M[3][2];
r[3] = v[0] * M[0][3] + v[1] * M[1][3] + M[2][3] * v[2] + M[3][3];
}
void mul_v3_m3v3(float r[3], const float M[3][3], const float a[3])
{
BLI_assert(r != a);