path: root/src/gui/math3d/qmatrix4x4.h
diff options
authorSean Harmer <>2014-04-19 16:36:35 +0100
committerThe Qt Project <>2014-05-16 09:53:58 +0200
commitca15825ed4a1d4c8642c2292760726ebdcda863b (patch)
treeca28f9e9d3938386379b3c963d475382fca86166 /src/gui/math3d/qmatrix4x4.h
parent71fb3633e8d909e9a91e1bee6eaf53c146f25998 (diff)
Add viewport transform to QMatrix4x4
This allows to easily create a matrix that performs the transformation used by OpenGL fixed function to go from normalized device coordinates to window coordinates. This comes in useful if you need to perform the NDC->window coordinate conversion inside a shader. Change-Id: I183b3545bfb3eb1e8b13fc3172911b46926fcbb7 Reviewed-by: Paul Lemire <> Reviewed-by: Laszlo Agocs <>
Diffstat (limited to 'src/gui/math3d/qmatrix4x4.h')
1 files changed, 7 insertions, 0 deletions
diff --git a/src/gui/math3d/qmatrix4x4.h b/src/gui/math3d/qmatrix4x4.h
index d4ba7d64d8..c42ccc2dc5 100644
--- a/src/gui/math3d/qmatrix4x4.h
+++ b/src/gui/math3d/qmatrix4x4.h
@@ -148,6 +148,8 @@ public:
#ifndef QT_NO_VECTOR3D
void lookAt(const QVector3D& eye, const QVector3D& center, const QVector3D& up);
+ void viewport(const QRectF &rect);
+ void viewport(float left, float bottom, float width, float height, float nearPlane = 0.0f, float farPlane = 1.0f);
void flipCoordinates();
void copyDataTo(float *values) const;
@@ -1077,6 +1079,11 @@ inline float *QMatrix4x4::data()
return *m;
+inline void QMatrix4x4::viewport(const QRectF &rect)
+ viewport(rect.x(), rect.y(), rect.width(), rect.height());
Q_GUI_EXPORT QDebug operator<<(QDebug dbg, const QMatrix4x4 &m);