summaryrefslogtreecommitdiffstats
path: root/src/gui/math3d/qmatrix4x4.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/gui/math3d/qmatrix4x4.cpp')
-rw-r--r--src/gui/math3d/qmatrix4x4.cpp16
1 files changed, 16 insertions, 0 deletions
diff --git a/src/gui/math3d/qmatrix4x4.cpp b/src/gui/math3d/qmatrix4x4.cpp
index 837bd519b8..cef92af66b 100644
--- a/src/gui/math3d/qmatrix4x4.cpp
+++ b/src/gui/math3d/qmatrix4x4.cpp
@@ -55,6 +55,20 @@ QT_BEGIN_NAMESPACE
\since 4.6
\ingroup painting-3D
+ The QMatrix4x4 class in general is treated as a row-major matrix, in that the
+ constructors and operator() functions take data in row-major format, as is
+ familiar in C-style usage.
+
+ Internally the data is stored as column-major format, so as to be optimal for
+ passing to OpenGL functions, which expect column-major data.
+
+ When using these functions be aware that they return data in \bold{column-major}
+ format:
+ \list
+ \o data()
+ \o constData()
+ \endlist
+
\sa QVector3D, QGenericMatrix
*/
@@ -1725,6 +1739,7 @@ QRectF QMatrix4x4::mapRect(const QRectF& rect) const
\fn const qreal *QMatrix4x4::data() const
Returns a constant pointer to the raw data of this matrix.
+ This raw data is stored in column-major format.
\sa constData()
*/
@@ -1733,6 +1748,7 @@ QRectF QMatrix4x4::mapRect(const QRectF& rect) const
\fn const qreal *QMatrix4x4::constData() const
Returns a constant pointer to the raw data of this matrix.
+ This raw data is stored in column-major format.
\sa data()
*/