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-rw-r--r--src/mesa/math/m_matrix.h12
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)
+
+
+
/*@}*/