diff options
Diffstat (limited to 'src/gui/math3d/qmatrix4x4.cpp')
| -rw-r--r-- | src/gui/math3d/qmatrix4x4.cpp | 76 |
1 files changed, 57 insertions, 19 deletions
diff --git a/src/gui/math3d/qmatrix4x4.cpp b/src/gui/math3d/qmatrix4x4.cpp index 0b3c5b4cb9..c8a036918c 100644 --- a/src/gui/math3d/qmatrix4x4.cpp +++ b/src/gui/math3d/qmatrix4x4.cpp @@ -1,40 +1,32 @@ /**************************************************************************** ** -** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies). +** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies). ** Contact: http://www.qt-project.org/legal ** ** This file is part of the QtGui module of the Qt Toolkit. ** -** $QT_BEGIN_LICENSE:LGPL$ +** $QT_BEGIN_LICENSE:LGPL21$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in -** a written agreement between you and Digia. For licensing terms and -** conditions see http://qt.digia.com/licensing. For further information +** a written agreement between you and Digia. For licensing terms and +** conditions see http://qt.digia.com/licensing. For further information ** use the contact form at http://qt.digia.com/contact-us. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser -** General Public License version 2.1 as published by the Free Software -** Foundation and appearing in the file LICENSE.LGPL included in the -** packaging of this file. Please review the following information to -** ensure the GNU Lesser General Public License version 2.1 requirements -** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** General Public License version 2.1 or version 3 as published by the Free +** Software Foundation and appearing in the file LICENSE.LGPLv21 and +** LICENSE.LGPLv3 included in the packaging of this file. Please review the +** following information to ensure the GNU Lesser General Public License +** requirements will be met: https://www.gnu.org/licenses/lgpl.html and +** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** In addition, as a special exception, Digia gives you certain additional -** rights. These rights are described in the Digia Qt LGPL Exception +** rights. These rights are described in the Digia Qt LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** -** GNU General Public License Usage -** Alternatively, this file may be used under the terms of the GNU -** General Public License version 3.0 as published by the Free Software -** Foundation and appearing in the file LICENSE.GPL included in the -** packaging of this file. Please review the following information to -** ensure the GNU General Public License version 3.0 requirements will be -** met: http://www.gnu.org/copyleft/gpl.html. -** -** ** $QT_END_LICENSE$ ** ****************************************************************************/ @@ -1542,6 +1534,52 @@ void QMatrix4x4::lookAt(const QVector3D& eye, const QVector3D& center, const QVe #endif /*! + \fn void QMatrix4x4::viewport(const QRectF &rect) + \overload + + Sets up viewport transform for viewport bounded by \a rect and with near and far set + to 0 and 1 respectively. +*/ + +/*! + Multiplies this matrix by another that performs the scale and bias + transformation used by OpenGL to transform from normalized device + coordinates (NDC) to viewport (window) coordinates. That is it maps + points from the cube ranging over [-1, 1] in each dimension to the + viewport with it's near-lower-left corner at (\a left, \a bottom, \a nearPlane) + and with size (\a width, \a height, \a farPlane - \a nearPlane). + + This matches the transform used by the fixed function OpenGL viewport + transform controlled by the functions glViewport() and glDepthRange(). + */ +void QMatrix4x4::viewport(float left, float bottom, float width, float height, float nearPlane, float farPlane) +{ + const float w2 = width / 2.0f; + const float h2 = height / 2.0f; + + QMatrix4x4 m(1); + m.m[0][0] = w2; + m.m[1][0] = 0.0f; + m.m[2][0] = 0.0f; + m.m[3][0] = left + w2; + m.m[0][1] = 0.0f; + m.m[1][1] = h2; + m.m[2][1] = 0.0f; + m.m[3][1] = bottom + h2; + m.m[0][2] = 0.0f; + m.m[1][2] = 0.0f; + m.m[2][2] = (farPlane - nearPlane) / 2.0f; + m.m[3][2] = (nearPlane + farPlane) / 2.0f; + m.m[0][3] = 0.0f; + m.m[1][3] = 0.0f; + m.m[2][3] = 0.0f; + m.m[3][3] = 1.0f; + m.flagBits = General; + + *this *= m; +} + +/*! \deprecated Flips between right-handed and left-handed coordinate systems |