diff options
Diffstat (limited to 'src/mesa/math/m_matrix.h')
| -rw-r--r-- | src/mesa/math/m_matrix.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/mesa/math/m_matrix.h b/src/mesa/math/m_matrix.h index e8303f3ac5..a8d9000e89 100644 --- a/src/mesa/math/m_matrix.h +++ b/src/mesa/math/m_matrix.h @@ -189,6 +189,18 @@ do { \ } while (0) +/** + * Transform a direction by a matrix. + */ +#define TRANSFORM_DIRECTION( TO, DIR, MAT ) \ +do { \ + TO[0] = DIR[0] * MAT[0] + DIR[1] * MAT[4] + DIR[2] * MAT[8]; \ + TO[1] = DIR[0] * MAT[1] + DIR[1] * MAT[5] + DIR[2] * MAT[9]; \ + TO[2] = DIR[0] * MAT[2] + DIR[1] * MAT[6] + DIR[2] * MAT[10];\ +} while (0) + + + /*@}*/ |