Modify QMatrix4x4 and QQuaternion to use qreal internally

Some concerns were expressed about the float precision of QMatrix4x4,
which this change addresses by using qreal instead.

The QVector2D/3D/4D classes still use float internally, so that they
can be used directly in large arrays of vertex values to be uploaded
to an OpenGL server.

QQuaternion is a client-side class, and it should produce rotations
that are consistent with QMatrix4x4.  So its precision was changed too.

A consequence of this change is that the following no longer works
in a portable fashion:

    QMatrix4x4 mat;
    ...
    glLoadMatrixf(mat.constData());

The caller must now repack the argument to convert from qreal to GLfloat.

Reviewed-by: Michael Goddard
Reviewed-by: Andreas

1 files changed, 0 insertions, 3 deletions

diff --git a/src/gui/math3d/qvector3d.h b/src/gui/math3d/qvector3d.h
index 767517e..1e95865 100644
--- a/src/gui/math3d/qvector3d.h
+++ b/src/gui/math3d/qvector3d.h
@@ -54,7 +54,6 @@ QT_MODULE(Gui)
 class QMatrix4x4;
 class QVector2D;
 class QVector4D;
-class QQuaternion;
 
 #ifndef QT_NO_VECTOR3D
 
@@ -136,8 +135,6 @@ private:
 
     friend class QVector2D;
     friend class QVector4D;
-    friend class QQuaternion;
-    friend class QMatrix4x4;
 #ifndef QT_NO_MATRIX4X4
     friend QVector3D operator*(const QVector3D& vector, const QMatrix4x4& matrix);
     friend QVector3D operator*(const QMatrix4x4& matrix, const QVector3D& vector);