5621a7c501
While we will cover the entire surface with our textured quads, the clear is still necessary in order to make top-levels with TranslucentBackground render correctly: We don't want to blend transparent areas with undefined content that is in the surface's framebuffer. Blending is problematic for alpha values. We now prevent the blended alpha from being written out. This ensures that in examples like qquickviewcomparison, where the backingstore image contains an alpha of 0.5 while the QQuickWidget texture 1.0, the result is still an alpha value of 1.0 in the final image. Writing out an alpha of 0.5 would break on systems where windows get an alpha buffer by default. hellogl2 can now take a --transparent parameter which makes the QOpenGLWidget being cleared to transparent in order to verify it works in combination with Qt::WA_TranslucentBackground. The swapped red and blue problem is also corrected. RGBA8888 does not need swizzling. The only format that needs this is RGB32. Task-number: QTBUG-40716 Change-Id: I54a9fd3a91a1b59575b38cdb908835315514e40f Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>
105 lines
3.4 KiB
C++
105 lines
3.4 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
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** of its contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef GLWIDGET_H
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#define GLWIDGET_H
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#include <QOpenGLWidget>
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#include <QOpenGLFunctions>
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#include <QOpenGLVertexArrayObject>
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#include <QOpenGLBuffer>
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#include <QMatrix4x4>
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#include "logo.h"
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QT_FORWARD_DECLARE_CLASS(QOpenGLShaderProgram)
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class GLWidget : public QOpenGLWidget, protected QOpenGLFunctions
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{
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Q_OBJECT
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public:
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GLWidget(QWidget *parent = 0);
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~GLWidget();
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QSize minimumSizeHint() const Q_DECL_OVERRIDE;
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QSize sizeHint() const Q_DECL_OVERRIDE;
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public slots:
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void setXRotation(int angle);
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void setYRotation(int angle);
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void setZRotation(int angle);
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void cleanup();
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signals:
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void xRotationChanged(int angle);
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void yRotationChanged(int angle);
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void zRotationChanged(int angle);
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protected:
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void initializeGL() Q_DECL_OVERRIDE;
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void paintGL() Q_DECL_OVERRIDE;
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void resizeGL(int width, int height) Q_DECL_OVERRIDE;
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void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
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void mouseMoveEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
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private:
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void setupVertexAttribs();
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bool m_core;
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int m_xRot;
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int m_yRot;
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int m_zRot;
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QPoint m_lastPos;
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Logo m_logo;
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QOpenGLVertexArrayObject m_vao;
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QOpenGLBuffer m_logoVbo;
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QOpenGLShaderProgram *m_program;
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int m_projMatrixLoc;
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int m_mvMatrixLoc;
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int m_normalMatrixLoc;
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int m_lightPosLoc;
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QMatrix4x4 m_proj;
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QMatrix4x4 m_camera;
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QMatrix4x4 m_world;
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bool m_transparent;
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};
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#endif
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