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Modernize the OpenGL examples

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Change them to use QOpenGLWidget and QOpenGLTexture.
Advocate also the usage of VBOs.

Hopeless examples, that rely on the fixed pipeline and will
not compile or work in ES and dynamic builds, are moved to
a "legacy" directory. The documentation pages for these are
removed. This long due change avoids the confusion newcomers
experience when trying to get started with Qt 5 and OpenGL.

hellowindow's behavior is changed to open a single window only
by default. The old default behavior, that opened three windows
on platforms that supported both MultipleWindows & ThreadedOpenGL,
can be requested by passing --multiple. --single is removed since it
is the default now. This plays much nicer with drivers that have
issues with threading.

In addition, say hello to hellogl2.

This is the old hellogl example updated to use QOpenGLWidget and
OpenGL 2. It also has a mainwindow with multiple (un)dockable widgets
containing the OpenGL widgets. This helps testing the behavior when
the top-level of the QOpenGLWidget changes and provides a very
important example of how to do proper resource management in this case.
(must use aboutToBeDestroyed() of the context, since the context goes
away and is replaced by a new one on every dock/undock)

As a bonus, the logo is now real 3D, no more orthographic nonsense.

Launch with --multisample to request 4x MSAA.

Launch with --coreprofile to request 3.2 Core. In this particular example
the shaders are present in both versions and there is a VAO so the application
is functional with core profile contexts.

Change-Id: Id780a80cb0708ef164cc172450ed74050f065596
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>
This commit is contained in:
Laszlo Agocs 2014-08-02 19:42:15 +02:00
parent 338f9c4f7c
commit 611558d877
106 changed files with 1590 additions and 1174 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
examples/opengl/2dpainting/2dpainting.pro
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@ -1,4 +1,4 @@
QT += opengl widgets QT += widgets
HEADERS = glwidget.h \ HEADERS = glwidget.h \
helper.h \ helper.h \

5
examples/opengl/2dpainting/glwidget.cpp
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@ -41,11 +41,12 @@
#include "glwidget.h" #include "glwidget.h"
#include "helper.h" #include "helper.h"
#include <QPainter>
#include <QTimer> #include <QTimer>
//! [0] //! [0]
GLWidget::GLWidget(Helper *helper, QWidget *parent) GLWidget::GLWidget(Helper *helper, QWidget *parent)
: QGLWidget(QGLFormat(QGL::SampleBuffers), parent), helper(helper) : QOpenGLWidget(parent), helper(helper)
{ {
elapsed = 0; elapsed = 0;
setFixedSize(200, 200); setFixedSize(200, 200);
@ -57,7 +58,7 @@ GLWidget::GLWidget(Helper *helper, QWidget *parent)
void GLWidget::animate() void GLWidget::animate()
{ {
elapsed = (elapsed + qobject_cast<QTimer*>(sender())->interval()) % 1000; elapsed = (elapsed + qobject_cast<QTimer*>(sender())->interval()) % 1000;
repaint(); update();
} }
//! [1] //! [1]

4
examples/opengl/2dpainting/glwidget.h
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@ -41,12 +41,12 @@
#ifndef GLWIDGET_H #ifndef GLWIDGET_H
#define GLWIDGET_H #define GLWIDGET_H
#include <QGLWidget> #include <QOpenGLWidget>
//! [0] //! [0]
class Helper; class Helper;
class GLWidget : public QGLWidget class GLWidget : public QOpenGLWidget
{ {
Q_OBJECT Q_OBJECT

6
examples/opengl/2dpainting/main.cpp
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@ -41,10 +41,16 @@
#include "window.h" #include "window.h"
#include <QApplication> #include <QApplication>
#include <QSurfaceFormat>
int main(int argc, char *argv[]) int main(int argc, char *argv[])
{ {
QApplication app(argc, argv); QApplication app(argc, argv);
QSurfaceFormat fmt;
fmt.setSamples(4);
QSurfaceFormat::setDefaultFormat(fmt);
Window window; Window window;
window.show(); window.show();
return app.exec(); return app.exec();

2
examples/opengl/2dpainting/widget.cpp
View File

@ -57,7 +57,7 @@ Widget::Widget(Helper *helper, QWidget *parent)
void Widget::animate() void Widget::animate()
{ {
elapsed = (elapsed + qobject_cast<QTimer*>(sender())->interval()) % 1000; elapsed = (elapsed + qobject_cast<QTimer*>(sender())->interval()) % 1000;
repaint(); update();
} }
//! [1] //! [1]

21
examples/opengl/cube/cube.pro
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@ -5,20 +5,17 @@ TEMPLATE = app
SOURCES += main.cpp SOURCES += main.cpp
qtHaveModule(opengl) { SOURCES += \
QT += opengl mainwidget.cpp \
geometryengine.cpp
SOURCES += mainwidget.cpp \ HEADERS += \
geometryengine.cpp mainwidget.h \
geometryengine.h
HEADERS += \ RESOURCES += \
mainwidget.h \ shaders.qrc \
geometryengine.h textures.qrc
RESOURCES += \
shaders.qrc \
textures.qrc
}
# install # install
target.path = $$[QT_INSTALL_EXAMPLES]/opengl/cube target.path = $$[QT_INSTALL_EXAMPLES]/opengl/cube

46
examples/opengl/cube/geometryengine.cpp
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@ -1,6 +1,6 @@
/**************************************************************************** /****************************************************************************
** **
** 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 ** Contact: http://www.qt-project.org/legal
** **
** This file is part of the QtCore module of the Qt Toolkit. ** This file is part of the QtCore module of the Qt Toolkit.
@ -49,29 +49,27 @@ struct VertexData
QVector2D texCoord; QVector2D texCoord;
}; };
//! [0]
GeometryEngine::GeometryEngine() GeometryEngine::GeometryEngine()
: indexBuf(QOpenGLBuffer::IndexBuffer)
{ {
} initializeOpenGLFunctions();
GeometryEngine::~GeometryEngine()
{
glDeleteBuffers(2, vboIds);
}
void GeometryEngine::init()
{
initializeGLFunctions();
//! [0]
// Generate 2 VBOs // Generate 2 VBOs
glGenBuffers(2, vboIds); arrayBuf.create();
indexBuf.create();
//! [0]
// Initializes cube geometry and transfers it to VBOs // Initializes cube geometry and transfers it to VBOs
initCubeGeometry(); initCubeGeometry();
} }
GeometryEngine::~GeometryEngine()
{
arrayBuf.destroy();
indexBuf.destroy();
}
//! [0]
void GeometryEngine::initCubeGeometry() void GeometryEngine::initCubeGeometry()
{ {
// For cube we would need only 8 vertices but we have to // For cube we would need only 8 vertices but we have to
@ -133,21 +131,21 @@ void GeometryEngine::initCubeGeometry()
//! [1] //! [1]
// Transfer vertex data to VBO 0 // Transfer vertex data to VBO 0
glBindBuffer(GL_ARRAY_BUFFER, vboIds[0]); arrayBuf.bind();
glBufferData(GL_ARRAY_BUFFER, 24 * sizeof(VertexData), vertices, GL_STATIC_DRAW); arrayBuf.allocate(vertices, 24 * sizeof(VertexData));
// Transfer index data to VBO 1 // Transfer index data to VBO 1
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vboIds[1]); indexBuf.bind();
glBufferData(GL_ELEMENT_ARRAY_BUFFER, 34 * sizeof(GLushort), indices, GL_STATIC_DRAW); indexBuf.allocate(indices, 34 * sizeof(GLushort));
//! [1] //! [1]
} }
//! [2] //! [2]
void GeometryEngine::drawCubeGeometry(QGLShaderProgram *program) void GeometryEngine::drawCubeGeometry(QOpenGLShaderProgram *program)
{ {
// Tell OpenGL which VBOs to use // Tell OpenGL which VBOs to use
glBindBuffer(GL_ARRAY_BUFFER, vboIds[0]); arrayBuf.bind();
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vboIds[1]); indexBuf.bind();
// Offset for position // Offset for position
quintptr offset = 0; quintptr offset = 0;
@ -155,7 +153,7 @@ void GeometryEngine::drawCubeGeometry(QGLShaderProgram *program)
// Tell OpenGL programmable pipeline how to locate vertex position data // Tell OpenGL programmable pipeline how to locate vertex position data
int vertexLocation = program->attributeLocation("a_position"); int vertexLocation = program->attributeLocation("a_position");
program->enableAttributeArray(vertexLocation); program->enableAttributeArray(vertexLocation);
glVertexAttribPointer(vertexLocation, 3, GL_FLOAT, GL_FALSE, sizeof(VertexData), (const void *)offset); program->setAttributeBuffer(vertexLocation, GL_FLOAT, offset, 3, sizeof(VertexData));
// Offset for texture coordinate // Offset for texture coordinate
offset += sizeof(QVector3D); offset += sizeof(QVector3D);
@ -163,7 +161,7 @@ void GeometryEngine::drawCubeGeometry(QGLShaderProgram *program)
// Tell OpenGL programmable pipeline how to locate vertex texture coordinate data // Tell OpenGL programmable pipeline how to locate vertex texture coordinate data
int texcoordLocation = program->attributeLocation("a_texcoord"); int texcoordLocation = program->attributeLocation("a_texcoord");
program->enableAttributeArray(texcoordLocation); program->enableAttributeArray(texcoordLocation);
glVertexAttribPointer(texcoordLocation, 2, GL_FLOAT, GL_FALSE, sizeof(VertexData), (const void *)offset); program->setAttributeBuffer(texcoordLocation, GL_FLOAT, offset, 2, sizeof(VertexData));
// Draw cube geometry using indices from VBO 1 // Draw cube geometry using indices from VBO 1
glDrawElements(GL_TRIANGLE_STRIP, 34, GL_UNSIGNED_SHORT, 0); glDrawElements(GL_TRIANGLE_STRIP, 34, GL_UNSIGNED_SHORT, 0);

15
examples/opengl/cube/geometryengine.h
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@ -1,6 +1,6 @@
/**************************************************************************** /****************************************************************************
** **
** 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 ** Contact: http://www.qt-project.org/legal
** **
** This file is part of the QtCore module of the Qt Toolkit. ** This file is part of the QtCore module of the Qt Toolkit.
@ -41,22 +41,23 @@
#ifndef GEOMETRYENGINE_H #ifndef GEOMETRYENGINE_H
#define GEOMETRYENGINE_H #define GEOMETRYENGINE_H
#include <QGLFunctions> #include <QOpenGLFunctions>
#include <QGLShaderProgram> #include <QOpenGLShaderProgram>
#include <QOpenGLBuffer>
class GeometryEngine : protected QGLFunctions class GeometryEngine : protected QOpenGLFunctions
{ {
public: public:
GeometryEngine(); GeometryEngine();
virtual ~GeometryEngine(); virtual ~GeometryEngine();
void init(); void drawCubeGeometry(QOpenGLShaderProgram *program);
void drawCubeGeometry(QGLShaderProgram *program);
private: private:
void initCubeGeometry(); void initCubeGeometry();
GLuint vboIds[2]; QOpenGLBuffer arrayBuf;
QOpenGLBuffer indexBuf;
}; };
#endif // GEOMETRYENGINE_H #endif // GEOMETRYENGINE_H

8
examples/opengl/cube/main.cpp
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@ -1,6 +1,6 @@
/**************************************************************************** /****************************************************************************
** **
** 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 ** Contact: http://www.qt-project.org/legal
** **
** This file is part of the QtCore module of the Qt Toolkit. ** This file is part of the QtCore module of the Qt Toolkit.
@ -40,6 +40,7 @@
#include <QApplication> #include <QApplication>
#include <QLabel> #include <QLabel>
#include <QSurfaceFormat>
#ifndef QT_NO_OPENGL #ifndef QT_NO_OPENGL
#include "mainwidget.h" #include "mainwidget.h"
@ -48,6 +49,11 @@
int main(int argc, char *argv[]) int main(int argc, char *argv[])
{ {
QApplication app(argc, argv); QApplication app(argc, argv);
QSurfaceFormat format;
format.setDepthBufferSize(24);
QSurfaceFormat::setDefaultFormat(format);
app.setApplicationName("cube"); app.setApplicationName("cube");
app.setApplicationVersion("0.1"); app.setApplicationVersion("0.1");
#ifndef QT_NO_OPENGL #ifndef QT_NO_OPENGL

46
examples/opengl/cube/mainwidget.cpp
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@ -1,6 +1,6 @@
/**************************************************************************** /****************************************************************************
** **
** 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 ** Contact: http://www.qt-project.org/legal
** **
** This file is part of the QtCore module of the Qt Toolkit. ** This file is part of the QtCore module of the Qt Toolkit.
@ -45,14 +45,21 @@
#include <math.h> #include <math.h>
MainWidget::MainWidget(QWidget *parent) : MainWidget::MainWidget(QWidget *parent) :
QGLWidget(parent), QOpenGLWidget(parent),
geometries(0),
texture(0),
angularSpeed(0) angularSpeed(0)
{ {
} }
MainWidget::~MainWidget() MainWidget::~MainWidget()
{ {
deleteTexture(texture); // Make sure the context is current when deleting the texture
// and the buffers.
makeCurrent();
delete texture;
delete geometries;
doneCurrent();
} }
//! [0] //! [0]
@ -95,16 +102,18 @@ void MainWidget::timerEvent(QTimerEvent *)
// Update rotation // Update rotation
rotation = QQuaternion::fromAxisAndAngle(rotationAxis, angularSpeed) * rotation; rotation = QQuaternion::fromAxisAndAngle(rotationAxis, angularSpeed) * rotation;
// Update scene // Request an update
updateGL(); update();
} }
} }
//! [1] //! [1]
void MainWidget::initializeGL() void MainWidget::initializeGL()
{ {
initializeGLFunctions(); initializeOpenGLFunctions();
qglClearColor(Qt::black);
glClearColor(0, 0, 0, 1);
initShaders(); initShaders();
initTextures(); initTextures();
@ -116,7 +125,7 @@ void MainWidget::initializeGL()
glEnable(GL_CULL_FACE); glEnable(GL_CULL_FACE);
//! [2] //! [2]
geometries.init(); geometries = new GeometryEngine;
// Use QBasicTimer because its faster than QTimer // Use QBasicTimer because its faster than QTimer
timer.start(12, this); timer.start(12, this);
@ -126,11 +135,11 @@ void MainWidget::initializeGL()
void MainWidget::initShaders() void MainWidget::initShaders()
{ {
// Compile vertex shader // Compile vertex shader
if (!program.addShaderFromSourceFile(QGLShader::Vertex, ":/vshader.glsl")) if (!program.addShaderFromSourceFile(QOpenGLShader::Vertex, ":/vshader.glsl"))
close(); close();
// Compile fragment shader // Compile fragment shader
if (!program.addShaderFromSourceFile(QGLShader::Fragment, ":/fshader.glsl")) if (!program.addShaderFromSourceFile(QOpenGLShader::Fragment, ":/fshader.glsl"))
close(); close();
// Link shader pipeline // Link shader pipeline
@ -147,28 +156,23 @@ void MainWidget::initShaders()
void MainWidget::initTextures() void MainWidget::initTextures()
{ {
// Load cube.png image // Load cube.png image
glEnable(GL_TEXTURE_2D); texture = new QOpenGLTexture(QImage(":/cube.png").mirrored());
texture = bindTexture(QImage(":/cube.png"));
// Set nearest filtering mode for texture minification // Set nearest filtering mode for texture minification
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); texture->setMinificationFilter(QOpenGLTexture::Nearest);
// Set bilinear filtering mode for texture magnification // Set bilinear filtering mode for texture magnification
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); texture->setMagnificationFilter(QOpenGLTexture::Linear);
// Wrap texture coordinates by repeating // Wrap texture coordinates by repeating
// f.ex. texture coordinate (1.1, 1.2) is same as (0.1, 0.2) // f.ex. texture coordinate (1.1, 1.2) is same as (0.1, 0.2)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); texture->setWrapMode(QOpenGLTexture::Repeat);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
} }
//! [4] //! [4]
//! [5] //! [5]
void MainWidget::resizeGL(int w, int h) void MainWidget::resizeGL(int w, int h)
{ {
// Set OpenGL viewport to cover whole widget
glViewport(0, 0, w, h);
// Calculate aspect ratio // Calculate aspect ratio
qreal aspect = qreal(w) / qreal(h ? h : 1); qreal aspect = qreal(w) / qreal(h ? h : 1);
@ -188,6 +192,8 @@ void MainWidget::paintGL()
// Clear color and depth buffer // Clear color and depth buffer
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
texture->bind();
//! [6] //! [6]
// Calculate model view transformation // Calculate model view transformation
QMatrix4x4 matrix; QMatrix4x4 matrix;
@ -202,5 +208,5 @@ void MainWidget::paintGL()
program.setUniformValue("texture", 0); program.setUniformValue("texture", 0);
// Draw cube geometry // Draw cube geometry
geometries.drawCubeGeometry(&program); geometries->drawCubeGeometry(&program);
} }

18
examples/opengl/cube/mainwidget.h
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@ -1,6 +1,6 @@
/**************************************************************************** /****************************************************************************
** **
** 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 ** Contact: http://www.qt-project.org/legal
** **
** This file is part of the QtCore module of the Qt Toolkit. ** This file is part of the QtCore module of the Qt Toolkit.
@ -43,18 +43,18 @@
#include "geometryengine.h" #include "geometryengine.h"
#include <QGLWidget> #include <QOpenGLWidget>
#include <QGLFunctions> #include <QOpenGLFunctions>
#include <QMatrix4x4> #include <QMatrix4x4>
#include <QQuaternion> #include <QQuaternion>
#include <QVector2D> #include <QVector2D>
#include <QBasicTimer> #include <QBasicTimer>
#include <QGLShaderProgram> #include <QOpenGLShaderProgram>
#include <QOpenGLTexture>
class GeometryEngine; class GeometryEngine;
class MainWidget : public QGLWidget, protected QGLFunctions class MainWidget : public QOpenGLWidget, protected QOpenGLFunctions
{ {
Q_OBJECT Q_OBJECT
@ -76,10 +76,10 @@ protected:
private: private:
QBasicTimer timer; QBasicTimer timer;
QGLShaderProgram program; QOpenGLShaderProgram program;
GeometryEngine geometries; GeometryEngine *geometries;
GLuint texture; QOpenGLTexture *texture;
QMatrix4x4 projection; QMatrix4x4 projection;

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4
examples/opengl/doc/src/cube.qdoc
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@ -117,7 +117,9 @@
aren't facing towards screen. aren't facing towards screen.
Creating vertex buffer objects and transferring data to them is quite simple using Creating vertex buffer objects and transferring data to them is quite simple using
OpenGL provided functions. QOpenGLBuffer. MainWidget makes sure the GeometryEngine instance is created and
destroyed with the OpenGL context current. This way we can use OpenGL resources
in the constructor and perform proper cleanup in the destructor.
\snippet cube/geometryengine.cpp 0 \snippet cube/geometryengine.cpp 0

38
examples/opengl/doc/src/framebufferobject2.qdoc
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@ -1,38 +0,0 @@
/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:FDL$
** 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
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Free Documentation License Usage
** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of
** this file. Please review the following information to ensure
** the GNU Free Documentation License version 1.3 requirements
** will be met: http://www.gnu.org/copyleft/fdl.html.
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\example framebufferobject2
\title Framebuffer Object 2 Example
\ingroup examples-widgets-opengl
\brief The Framebuffer Object 2 example demonstrates how to use the
QGLFramebufferObject class to render into an off-screen buffer and
use the contents as a texture in a QGLWidget.
\image framebufferobject2-example.png
*/

36
examples/opengl/doc/src/grabber.qdoc
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@ -1,36 +0,0 @@
/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:FDL$
** 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
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Free Documentation License Usage
** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of
** this file. Please review the following information to ensure
** the GNU Free Documentation License version 1.3 requirements
** will be met: http://www.gnu.org/copyleft/fdl.html.
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\example grabber
\title Grabber Example
\ingroup examples-widgets-opengl
\brief The Grabber examples shows how to retrieve the contents of an OpenGL framebuffer.
\image grabber-example.png
*/

320
examples/opengl/doc/src/hellogl.qdoc
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@ -1,320 +0,0 @@
/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:FDL$
** 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
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Free Documentation License Usage
** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of
** this file. Please review the following information to ensure
** the GNU Free Documentation License version 1.3 requirements
** will be met: http://www.gnu.org/copyleft/fdl.html.
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\example hellogl
\title Hello GL Example
\ingroup examples-widgets-opengl
\brief The Hello GL example demonstrates the basic use of the OpenGL-related classes
provided with Qt.
\image hellogl-example.png
Qt provides the QGLWidget class to enable OpenGL graphics to be rendered within
a standard application user interface. By subclassing this class, and providing
reimplementations of event handler functions, 3D scenes can be displayed on
widgets that can be placed in layouts, connected to other objects using signals
and slots, and manipulated like any other widget.
\tableofcontents
\section1 GLWidget Class Definition
The \c GLWidget class contains some standard public definitions for the
constructor, destructor, \l{QWidget::sizeHint()}{sizeHint()}, and
\l{QWidget::minimumSizeHint()}{minimumSizeHint()} functions:
\snippet hellogl/glwidget.h 0
We use a destructor to ensure that any OpenGL-specific data structures
are deleted when the widget is no longer needed (although in this case nothing
needs cleaning up).
\snippet hellogl/glwidget.h 1
The signals and slots are used to allow other objects to interact with the
3D scene.
\snippet hellogl/glwidget.h 2
OpenGL initialization, viewport resizing, and painting are handled by
reimplementing the QGLWidget::initializeGL(), QGLWidget::resizeGL(), and
QGLWidget::paintGL() handler functions. To enable the user to interact
directly with the scene using the mouse, we reimplement
QWidget::mousePressEvent() and QWidget::mouseMoveEvent().
\snippet hellogl/glwidget.h 3
The rest of the class contains utility functions and variables that are
used to construct and hold orientation information for the scene. The
\c logo variable will be used to hold a pointer to the QtLogo object which
contains all the geometry.
\section1 GLWidget Class Implementation
In this example, we split the class into groups of functions and describe
them separately. This helps to illustrate the differences between subclasses
of native widgets (such as QWidget and QFrame) and QGLWidget subclasses.
\section2 Widget Construction and Sizing
The constructor provides default rotation angles for the scene, sets
the pointer to the QtLogo object to null, and sets up some colors for
later use.
\snippet hellogl/glwidget.cpp 0
We also implement a destructor to release OpenGL-related resources when the
widget is deleted:
\snippet hellogl/glwidget.cpp 1
In this case nothing requires cleaning up.
We provide size hint functions to ensure that the widget is shown at a
reasonable size:
\snippet hellogl/glwidget.cpp 2
\codeline
\snippet hellogl/glwidget.cpp 3
\snippet hellogl/glwidget.cpp 4
The widget provides three slots that enable other components in the
example to change the orientation of the scene:
\snippet hellogl/glwidget.cpp 5
In the above slot, the \c xRot variable is updated only if the new angle is
different to the old one, the \c xRotationChanged() signal is emitted to
allow other components to be updated, and an update is scheduled.
Note that the widget's \l{QGLWidget::updateGL()}{updateGL()} function is not
called directly from here. Triggering rendering and buffer swaps directly
from the input event handlers is not desirable. Such events may, depending
on the platform, occur at a high frequency, and calling a potentially
blocking function like \l{QOpenGLContext::swapBuffers()}{swapBuffers} may
lead to unexpected results due to the main thread not being able to process
the input events at a proper rate.
Instead, update() is used. This will eventually lead to a paint event, which
will in turn invoke paintGL(). Multiple calls to update() in a row will make
no difference while the event is still pending. This way the UI will perform
equally well with blocking swaps, that is, a a
\l{QGLFormat::swapInterval()}{swap interval} of 1, and non-vsynced
configurations.
The \c setYRotation() and \c setZRotation() slots perform the same task for
rotations measured by the \c yRot and \c zRot variables.
\section2 OpenGL Initialization
The \l{QGLWidget::initializeGL()}{initializeGL()} function is used to
perform useful initialization tasks that are needed to render the 3D scene.
These often involve defining colors and materials, enabling and disabling
certain rendering flags, and setting other properties used to customize the
rendering process.
\snippet hellogl/glwidget.cpp 6
In this example, we reimplement the function to set the background color,
create a QtLogo object instance which will contain all the geometry to
display, and set up the rendering process to use a particular shading model
and rendering flags.
\section2 Resizing the Viewport
The \l{QGLWidget::resizeGL()}{resizeGL()} function is used to ensure that
the OpenGL implementation renders the scene onto a viewport that matches the
size of the widget, using the correct transformation from 3D coordinates to
2D viewport coordinates.
The function is called whenever the widget's dimensions change, and is
supplied with the new width and height. Here, we define a square viewport
based on the length of the smallest side of the widget to ensure that
the scene is not distorted if the widget has sides of unequal length:
\snippet hellogl/glwidget.cpp 8
A discussion of the projection transformation used is outside the scope of
this example. Please consult the OpenGL reference documentation for an
explanation of projection matrices.
\section2 Painting the Scene
The \l{QGLWidget::paintGL()}{paintGL()} function is used to paint the
contents of the scene onto the widget. For widgets that only need to be
decorated with pure OpenGL content, we reimplement QGLWidget::paintGL()
\e instead of reimplementing QWidget::paintEvent():
\snippet hellogl/glwidget.cpp 7
In this example, we clear the widget using the background color that
we defined in the \l{QGLWidget::initializeGL()}{initializeGL()} function,
set up the frame of reference for the geometry we want to display, and
call the draw method of the QtLogo object to render the scene.
\section2 Mouse Handling
Just as in subclasses of native widgets, mouse events are handled by
reimplementing functions such as QWidget::mousePressEvent() and
QWidget::mouseMoveEvent().
The \l{QWidget::mousePressEvent()}{mousePressEvent()} function simply
records the position of the mouse when a button is initially pressed:
\snippet hellogl/glwidget.cpp 9
The \l{QWidget::mouseMoveEvent()}{mouseMoveEvent()} function uses the
previous location of the mouse cursor to determine how much the object
in the scene should be rotated, and in which direction:
\snippet hellogl/glwidget.cpp 10
Since the user is expected to hold down the mouse button and drag the
cursor to rotate the object, the cursor's position is updated every time
a move event is received.
\section1 QtLogo Class
This class encapsulates the OpenGL geometry data which will be rendered
in the basic 3D scene.
\snippet shared/qtlogo.h 0
The geometry is divided into a list of parts which may be rendered in
different ways. The data itself is contained in a Geometry structure that
includes the vertices, their lighting normals and index values which
point into the vertices, grouping them into faces.
\snippet shared/qtlogo.cpp 0
The data in the Geometry class is stored in QVector<QVector3D> members
which are convenient for use with OpenGL because they expose raw
contiguous floating point values via the constData() method. Methods
are included for adding new vertex data, either with smooth normals, or
facetted normals; and for enabling the geometry ready for rendering.
\snippet shared/qtlogo.cpp 1
The higher level Patch class has methods for accumulating the geometry
one face at a time, and treating collections of faces or "patches" with
transformations, applying different colors or smoothing. Although faces
may be added as triangles or quads, at the OpenGL level all data is
treated as triangles for compatibility with OpenGL/ES.
\snippet shared/qtlogo.cpp 2
Drawing a Patch is simply acheived by applying any transformation,
and material effect, then drawing the data using the index range for
the patch. The model-view matrix is saved and then restored so that
any transformation does not affect other parts of the scene.
\snippet shared/qtlogo.cpp 3
The geometry is built once on construction of the QtLogo, and it is
paramaterized on a number of divisions - which controls how "chunky" the
curved section of the logo looks - and on a scale, so larger and smaller
QtLogo objects can be created without having to use OpenGL scaling
(which would force normal recalculation).
The building process is done by helper classes (read the source for full
details) which only exist during the build phase, to assemble the parts
of the scene.
\snippet shared/qtlogo.cpp 4
Finally the complete QtLogo scene is simply drawn by enabling the data arrays
and then iterating over the parts, calling draw() on each one.
\section1 Window Class Definition
The \c Window class is used as a container for the \c GLWidget used to
display the scene:
\snippet hellogl/window.h 0
In addition, it contains sliders that are used to change the orientation
of the object in the scene.
\section1 Window Class Implementation
The constructor constructs an instance of the \c GLWidget class and some
sliders to manipulate its contents.
\snippet hellogl/window.cpp 0
We connect the \l{QAbstractSlider::valueChanged()}{valueChanged()} signal
from each of the sliders to the appropriate slots in \c{glWidget}.
This allows the user to change the orientation of the object by dragging
the sliders.
We also connect the \c xRotationChanged(), \c yRotationChanged(), and
\c zRotationChanged() signals from \c glWidget to the
\l{QAbstractSlider::setValue()}{setValue()} slots in the
corresponding sliders.
\snippet hellogl/window.cpp 1
The sliders are placed horizontally in a layout alongside the \c GLWidget,
and initialized with suitable default values.
The \c createSlider() utility function constructs a QSlider, and ensures
that it is set up with a suitable range, step value, tick interval, and
page step value before returning it to the calling function:
\snippet hellogl/window.cpp 2
\section1 Summary
The \c GLWidget class implementation shows how to subclass QGLWidget for
the purposes of rendering a 3D scene using OpenGL calls. Since QGLWidget
is a subclass of QWidget, subclasses of QGLWidget can be placed in layouts
and provided with interactive features just like normal custom widgets.
We ensure that the widget is able to correctly render the scene using OpenGL
by reimplementing the following functions:
\list
\li QGLWidget::initializeGL() sets up resources needed by the OpenGL implementation
to render the scene.
\li QGLWidget::resizeGL() resizes the viewport so that the rendered scene fits onto
the widget, and sets up a projection matrix to map 3D coordinates to 2D viewport
coordinates.
\li QGLWidget::paintGL() performs painting operations using OpenGL calls.
\endlist
Since QGLWidget is a subclass of QWidget, it can also be used
as a normal paint device, allowing 2D graphics to be drawn with QPainter.
This use of QGLWidget is discussed in the \l{2D Painting Example}{2D Painting}
example.
More advanced users may want to paint over parts of a scene rendered using
OpenGL. QGLWidget allows pure OpenGL rendering to be mixed with QPainter
calls, but care must be taken to maintain the state of the OpenGL implementation.
See the \l{Overpainting Example}{Overpainting} example for more information.
*/

21
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@ -1,6 +1,6 @@
/**************************************************************************** /****************************************************************************
** **
** 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 ** Contact: http://www.qt-project.org/legal
** **
** This file is part of the documentation of the Qt Toolkit. ** This file is part of the documentation of the Qt Toolkit.
@ -26,13 +26,18 @@
****************************************************************************/ ****************************************************************************/
/*! /*!
\example pbuffers \example hellogl2
\title Pixel Buffers Example \title Hello GL2 Example
\ingroup examples-widgets-opengl \ingroup examples-widgets-opengl
\brief The Pixel Buffers example demonstrates how to use the
QGLPixelBuffer class to render into an off-screen buffer and use
the contents as a dynamic texture in a QGLWidget.
\image pbuffers-example.png \brief The Hello GL2 example demonstrates the basic use of the OpenGL-related classes
provided with Qt.
\image hellogl2-example.png
Qt provides the QOpenGLWidget class to enable OpenGL graphics to be rendered
within a standard application user interface. By subclassing this class, and
providing reimplementations of event handler functions, 3D scenes can be
displayed on widgets that can be placed in layouts, connected to other
objects using signals and slots, and manipulated like any other widget.
*/ */

244
examples/opengl/doc/src/overpainting.qdoc
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@ -1,244 +0,0 @@
/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:FDL$
** 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
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Free Documentation License Usage
** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of
** this file. Please review the following information to ensure
** the GNU Free Documentation License version 1.3 requirements
** will be met: http://www.gnu.org/copyleft/fdl.html.
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\example overpainting
\title Overpainting Example
\ingroup examples-widgets-opengl
\brief The Overpainting example shows how QPainter can be used
to overpaint a scene rendered using OpenGL in a QGLWidget.
\image overpainting-example.png
QGLWidget provides a widget with integrated OpenGL graphics support
that enables 3D graphics to be displayed using normal OpenGL calls,
yet also behaves like any other standard Qt widget with support for
signals and slots, properties, and Qt's action system.
Usually, QGLWidget is subclassed to display a pure 3D scene. The
developer reimplements \l{QGLWidget::initializeGL()}{initializeGL()}
to initialize any required resources, \l{QGLWidget::resizeGL()}{resizeGL()}
to set up the projection and viewport, and
\l{QGLWidget::paintGL()}{paintGL()} to perform the OpenGL calls needed
to render the scene. However, it is possible to subclass QGLWidget
differently to allow 2D graphics, drawn using QPainter, to be
painted over a scene rendered using OpenGL.
In this example, we demonstrate how this is done by reusing the code
from the \l{Hello GL Example}{Hello GL} example to provide a 3D scene,
and painting over it with some translucent 2D graphics. Instead of
examining each class in detail, we only cover the parts of the
\c GLWidget class that enable overpainting, and provide more detailed
discussion in the final section of this document.
\section1 GLWidget Class Definition
The \c GLWidget class is a subclass of QGLWidget, based on the one used
in the \l{Hello GL Example}{Hello GL} example. Rather than describe the
class as a whole, we show the first few lines of the class and only
discuss the changes we have made to the rest of it:
\snippet overpainting/glwidget.h 0
\dots
\snippet overpainting/glwidget.h 1
\dots
\snippet overpainting/glwidget.h 4
As usual, the widget uses \l{QGLWidget::initializeGL()}{initializeGL()}
to set up geometry for our scene and perform OpenGL initialization tasks.
The \l{QGLWidget::resizeGL()}{resizeGL()} function is used to ensure that
the 3D graphics in the scene are transformed correctly to the 2D viewport
displayed in the widget.
Instead of implementing \l{QGLWidget::paintGL()}{paintGL()} to handle updates
to the widget, we implement a normal QWidget::paintEvent(). This
allows us to mix OpenGL calls and QPainter operations in a controlled way.
In this example, we also implement QWidget::showEvent() to help with the
initialization of the 2D graphics used.
The new private member functions and variables relate exclusively to the
2D graphics and animation. The \c animate() slot is called periodically by the
\c animationTimer to update the widget; the \c createBubbles() function
initializes the \c bubbles list with instances of a helper class used to
draw the animation; the \c drawInstructions() function is responsible for
a semi-transparent message that is also overpainted onto the OpenGL scene.
\section1 GLWidget Class Implementation
Again, we only show the parts of the \c GLWidget implementation that are
relevant to this example. In the constructor, we initialize a QTimer to
control the animation:
\snippet overpainting/glwidget.cpp 0
We turn off the widget's \l{QWidget::autoFillBackground}{autoFillBackground} property to
instruct OpenGL not to paint a background for the widget when
\l{QPainter::begin()}{QPainter::begin()} is called.
As in the \l{Hello GL Example}{Hello GL} example, the destructor is responsible
for freeing any OpenGL-related resources:
\snippet overpainting/glwidget.cpp 1
The \c initializeGL() function is fairly minimal, only setting up the QtLogo
object used in the scene. See the \l{Hello GL Example}{Hello GL} example
for details of the QtLogo class.
\snippet overpainting/glwidget.cpp 2
To cooperate fully with QPainter, we defer matrix stack operations and attribute
initialization until the widget needs to be updated.
In this example, we implement \l{QWidget::paintEvent()}{paintEvent()} rather
than \l{QGLWidget::paintGL()}{paintGL()} to render
our scene. When drawing on a QGLWidget, the paint engine used by QPainter
performs certain operations that change the states of the OpenGL
implementation's matrix and property stacks. Therefore, it is necessary to
make all the OpenGL calls to display the 3D graphics before we construct
a QPainter to draw the 2D overlay.
We render a 3D scene by setting up model and projection transformations
and other attributes. We use an OpenGL stack operation to preserve the
original matrix state, allowing us to recover it later:
\snippet overpainting/glwidget.cpp 4
We define a color to use for the widget's background, and set up various
attributes that define how the scene will be rendered.
\snippet overpainting/glwidget.cpp 6
We call the \c setupViewport() private function to set up the
projection used for the scene. This is unnecessary in OpenGL
examples that implement the \l{QGLWidget::paintGL()}{paintGL()}
function because the matrix stacks are usually unmodified between
calls to \l{QGLWidget::resizeGL()}{resizeGL()} and
\l{QGLWidget::paintGL()}{paintGL()}.
Since the widget's background is not drawn by the system or by Qt, we use
an OpenGL call to paint it before positioning the object defined earlier
in the scene:
\snippet overpainting/glwidget.cpp 7
Once the QtLogo object's draw method has been executed, the GL
states we changed and the matrix stack needs to be restored to its
original state at the start of this function before we can begin
overpainting:
\snippet overpainting/glwidget.cpp 8
With the 3D graphics done, we construct a QPainter for use on the widget
and simply overpaint the widget with 2D graphics; in this case, using a
helper class to draw a number of translucent bubbles onto the widget,
and calling \c drawInstructions() to overlay some instructions:
\snippet overpainting/glwidget.cpp 10
When QPainter::end() is called, suitable OpenGL-specific calls are made to
write the scene, and its additional contents, onto the widget.
With \l{QGLWidget::paintGL()}{paintGL()} the
\l{QGLWidget::swapBuffers()}{swapBuffers()} call is done for us. But an explicit
call to swapBuffers() is still not required because in the
\l{QWidget::paintEvent()}{paintEvent()} method the QPainter on the OpenGL
widget takes care of this for us.
The implementation of the \l{QGLWidget::resizeGL()}{resizeGL()} function
sets up the dimensions of the viewport and defines a projection
transformation:
\snippet overpainting/glwidget.cpp 11
Ideally, we want to arrange the 2D graphics to suit the widget's dimensions.
To achieve this, we implement the \l{QWidget::showEvent()}{showEvent()} handler,
creating new graphic elements (bubbles) if necessary at appropriate positions
in the widget.
\snippet overpainting/glwidget.cpp 12
This function only has an effect if less than 20 bubbles have already been
created.
The \c animate() slot is called every time the widget's \c animationTimer emits
the \l{QTimer::timeout()}{timeout()} signal. This keeps the bubbles moving
around.
\snippet overpainting/glwidget.cpp 13
We simply iterate over the bubbles in the \c bubbles list, updating the
widget before and after each of them is moved.
The \c setupViewport() function is called from \c paintEvent()
and \c resizeGL().
\snippet overpainting/glwidget.cpp 14
The \c drawInstructions() function is used to prepare some basic
instructions that will be painted with the other 2D graphics over
the 3D scene.
\snippet overpainting/glwidget.cpp 15
\section1 Summary
When overpainting 2D content onto 3D content, we need to use a QPainter
\e and make OpenGL calls to achieve the desired effect. Since QPainter
itself uses OpenGL calls when used on a QGLWidget subclass, we need to
preserve the state of various OpenGL stacks when we perform our own
calls, using the following approach:
\list
\li Reimplement QGLWidget::initializeGL(), but only perform minimal
initialization. QPainter will perform its own initialization
routines, modifying the matrix and property stacks, so it is better
to defer certain initialization tasks until just before you render
the 3D scene.
\li Reimplement QGLWidget::resizeGL() as in the pure 3D case.
\li Reimplement QWidget::paintEvent() to draw both 2D and 3D graphics.
\endlist
The \l{QWidget::paintEvent()}{paintEvent()} implementation performs the
following tasks:
\list
\li Push the current OpenGL modelview matrix onto a stack.
\li Perform initialization tasks usually done in the
\l{QGLWidget::initializeGL()}{initializeGL()} function.
\li Perform code that would normally be located in the widget's
\l{QGLWidget::resizeGL()}{resizeGL()} function to set the correct
perspective transformation and set up the viewport.
\li Render the scene using OpenGL calls.
\li Pop the OpenGL modelview matrix off the stack.
\li Construct a QPainter object.
\li Initialize it for use on the widget with the QPainter::begin() function.
\li Draw primitives using QPainter's member functions.
\li Call QPainter::end() to finish painting.
\endlist
*/

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@ -1,38 +0,0 @@
/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:FDL$
** 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
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Free Documentation License Usage
** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of
** this file. Please review the following information to ensure
** the GNU Free Documentation License version 1.3 requirements
** will be met: http://www.gnu.org/copyleft/fdl.html.
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\example pbuffers2
\title Pixel Buffers 2 Example
\ingroup examples-widgets-opengl
\brief The Pixel Buffers 2 example demonstrates how to use the
QGLPixelBuffer class to render into an off-screen buffer and use
the contents as a dynamic texture in a QGLWidget.
\image pbuffers2-example.png
*/

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@ -1,37 +0,0 @@
/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:FDL$
** 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
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Free Documentation License Usage
** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of
** this file. Please review the following information to ensure
** the GNU Free Documentation License version 1.3 requirements
** will be met: http://www.gnu.org/copyleft/fdl.html.
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\example samplebuffers
\title Sample Buffers Example
\ingroup examples-widgets-opengl
\brief The Sample Buffers example demonstrates how to use and enable
sample buffers in a QGLWidget.
\image samplebuffers-example.png
*/

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@ -0,0 +1,283 @@
/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "glwidget.h"
#include <QMouseEvent>
#include <QOpenGLShaderProgram>
#include <QCoreApplication>
#include <math.h>
GLWidget::GLWidget(QWidget *parent)
: QOpenGLWidget(parent),
m_xRot(0),
m_yRot(0),
m_zRot(0),
m_program(0)
{
m_core = QCoreApplication::arguments().contains(QStringLiteral("--coreprofile"));
}
GLWidget::~GLWidget()
{
cleanup();
}
QSize GLWidget::minimumSizeHint() const
{
return QSize(50, 50);
}
QSize GLWidget::sizeHint() const
{
return QSize(400, 400);
}
static void qNormalizeAngle(int &angle)
{
while (angle < 0)
angle += 360 * 16;
while (angle > 360 * 16)
angle -= 360 * 16;
}
void GLWidget::setXRotation(int angle)
{
qNormalizeAngle(angle);
if (angle != m_xRot) {
m_xRot = angle;
emit xRotationChanged(angle);
update();
}
}
void GLWidget::setYRotation(int angle)
{
qNormalizeAngle(angle);
if (angle != m_yRot) {
m_yRot = angle;
emit yRotationChanged(angle);
update();
}
}
void GLWidget::setZRotation(int angle)
{
qNormalizeAngle(angle);
if (angle != m_zRot) {
m_zRot = angle;
emit zRotationChanged(angle);
update();
}
}
void GLWidget::cleanup()
{
makeCurrent();
m_logoVbo.destroy();
delete m_program;
m_program = 0;
doneCurrent();
}
static const char *vertexShaderSourceCore =
"#version 150\n"
"in vec4 vertex;\n"
"in vec3 normal;\n"
"out vec3 vert;\n"
"out vec3 vertNormal;\n"
"uniform mat4 projMatrix;\n"
"uniform mat4 mvMatrix;\n"
"uniform mat3 normalMatrix;\n"
"void main() {\n"
" vert = vertex.xyz;\n"
" vertNormal = normalMatrix * normal;\n"
" gl_Position = projMatrix * mvMatrix * vertex;\n"
"}\n";
static const char *fragmentShaderSourceCore =
"#version 150\n"
"in highp vec3 vert;\n"
"in highp vec3 vertNormal;\n"
"out highp vec4 fragColor;\n"
"uniform highp vec3 lightPos;\n"
"void main() {\n"
" highp vec3 L = normalize(lightPos - vert);\n"
" highp float NL = max(dot(normalize(vertNormal), L), 0.0);\n"
" highp vec3 color = vec3(0.39, 1.0, 0.0);\n"
" highp vec3 col = clamp(color * 0.2 + color * 0.8 * NL, 0.0, 1.0);\n"
" fragColor = vec4(col, 1.0);\n"
"}\n";
static const char *vertexShaderSource =
"attribute vec4 vertex;\n"
"attribute vec3 normal;\n"
"varying vec3 vert;\n"
"varying vec3 vertNormal;\n"
"uniform mat4 projMatrix;\n"
"uniform mat4 mvMatrix;\n"
"uniform mat3 normalMatrix;\n"
"void main() {\n"
" vert = vertex.xyz;\n"
" vertNormal = normalMatrix * normal;\n"
" gl_Position = projMatrix * mvMatrix * vertex;\n"
"}\n";
static const char *fragmentShaderSource =
"varying highp vec3 vert;\n"
"varying highp vec3 vertNormal;\n"
"uniform highp vec3 lightPos;\n"
"void main() {\n"
" highp vec3 L = normalize(lightPos - vert);\n"
" highp float NL = max(dot(normalize(vertNormal), L), 0.0);\n"
" highp vec3 color = vec3(0.39, 1.0, 0.0);\n"
" highp vec3 col = clamp(color * 0.2 + color * 0.8 * NL, 0.0, 1.0);\n"
" gl_FragColor = vec4(col, 1.0);\n"
"}\n";
void GLWidget::initializeGL()
{
// In this example the widget's corresponding top-level window can change
// several times during the widget's lifetime. Whenever this happens, the
// QOpenGLWidget's associated context is destroyed and a new one is created.
// Therefore we have to be prepared to clean up the resources on the
// aboutToBeDestroyed() signal, instead of the destructor. The emission of
// the signal will be followed by an invocation of initializeGL() where we
// can recreate all resources.
connect(context(), &QOpenGLContext::aboutToBeDestroyed, this, &GLWidget::cleanup);
initializeOpenGLFunctions();
m_program = new QOpenGLShaderProgram;
m_program->addShaderFromSourceCode(QOpenGLShader::Vertex, m_core ? vertexShaderSourceCore : vertexShaderSource);
m_program->addShaderFromSourceCode(QOpenGLShader::Fragment, m_core ? fragmentShaderSourceCore : fragmentShaderSource);
m_program->bindAttributeLocation("vertex", 0);
m_program->bindAttributeLocation("normal", 1);
m_program->link();
m_program->bind();
m_projMatrixLoc = m_program->uniformLocation("projMatrix");
m_mvMatrixLoc = m_program->uniformLocation("mvMatrix");
m_normalMatrixLoc = m_program->uniformLocation("normalMatrix");
m_lightPosLoc = m_program->uniformLocation("lightPos");
// Create a vertex array object. In OpenGL ES 2.0 and OpenGL 2.x
// implementations this is optional and support may not be present
// at all. Nonetheless the below code works in all cases and makes
// sure there is a VAO when one is needed.
m_vao.create();
QOpenGLVertexArrayObject::Binder vaoBinder(&m_vao);
// Setup our vertex buffer object.
m_logoVbo.create();
m_logoVbo.bind();
m_logoVbo.allocate(m_logo.constData(), m_logo.count() * sizeof(GLfloat));
// Store the vertex attribute bindings for the program.
setupVertexAttribs();
// Our camera never changes in this example.
m_camera.setToIdentity();
m_camera.translate(0, 0, -1);
// Light position is fixed.
m_program->setUniformValue(m_lightPosLoc, QVector3D(0, 0, 70));
m_program->release();
}
void GLWidget::setupVertexAttribs()
{
m_logoVbo.bind();
QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
f->glEnableVertexAttribArray(0);
f->glEnableVertexAttribArray(1);
f->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), 0);
f->glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), reinterpret_cast<void *>(3 * sizeof(GLfloat)));
m_logoVbo.release();
}
void GLWidget::paintGL()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
m_world.setToIdentity();
m_world.rotate(180.0f - (m_xRot / 16.0f), 1, 0, 0);
m_world.rotate(m_yRot / 16.0f, 0, 1, 0);
m_world.rotate(m_zRot / 16.0f, 0, 0, 1);
QOpenGLVertexArrayObject::Binder vaoBinder(&m_vao);
m_program->bind();
m_program->setUniformValue(m_projMatrixLoc, m_proj);
m_program->setUniformValue(m_mvMatrixLoc, m_camera * m_world);
QMatrix3x3 normalMatrix = m_world.normalMatrix();
m_program->setUniformValue(m_normalMatrixLoc, normalMatrix);
glDrawArrays(GL_TRIANGLES, 0, m_logo.vertexCount());
m_program->release();
}
void GLWidget::resizeGL(int w, int h)
{
m_proj.setToIdentity();
m_proj.perspective(45.0f, GLfloat(w) / h, 0.01f, 100.0f);
}
void GLWidget::mousePressEvent(QMouseEvent *event)
{
m_lastPos = event->pos();
}
void GLWidget::mouseMoveEvent(QMouseEvent *event)
{
int dx = event->x() - m_lastPos.x();
int dy = event->y() - m_lastPos.y();
if (event->buttons() & Qt::LeftButton) {
setXRotation(m_xRot + 8 * dy);
setYRotation(m_yRot + 8 * dx);
} else if (event->buttons() & Qt::RightButton) {
setXRotation(m_xRot + 8 * dy);
setZRotation(m_zRot + 8 * dx);
}
m_lastPos = event->pos();
}

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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef GLWIDGET_H
#define GLWIDGET_H
#include <QOpenGLWidget>
#include <QOpenGLFunctions>
#include <QOpenGLVertexArrayObject>
#include <QOpenGLBuffer>
#include <QMatrix4x4>
#include "logo.h"
QT_FORWARD_DECLARE_CLASS(QOpenGLShaderProgram)
class GLWidget : public QOpenGLWidget, protected QOpenGLFunctions
{
Q_OBJECT
public:
GLWidget(QWidget *parent = 0);
~GLWidget();
QSize minimumSizeHint() const Q_DECL_OVERRIDE;
QSize sizeHint() const Q_DECL_OVERRIDE;
public slots:
void setXRotation(int angle);
void setYRotation(int angle);
void setZRotation(int angle);
void cleanup();
signals:
void xRotationChanged(int angle);
void yRotationChanged(int angle);
void zRotationChanged(int angle);
protected:
void initializeGL() Q_DECL_OVERRIDE;
void paintGL() Q_DECL_OVERRIDE;
void resizeGL(int width, int height) Q_DECL_OVERRIDE;
void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
void mouseMoveEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
private:
void setupVertexAttribs();
bool m_core;
int m_xRot;
int m_yRot;
int m_zRot;
QPoint m_lastPos;
Logo m_logo;
QOpenGLVertexArrayObject m_vao;
QOpenGLBuffer m_logoVbo;
QOpenGLShaderProgram *m_program;
int m_projMatrixLoc;
int m_mvMatrixLoc;
int m_normalMatrixLoc;
int m_lightPosLoc;
QMatrix4x4 m_proj;
QMatrix4x4 m_camera;
QMatrix4x4 m_world;
};
#endif

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HEADERS = glwidget.h \
window.h \
mainwindow.h \
logo.h
SOURCES = glwidget.cpp \
main.cpp \
window.cpp \
mainwindow.cpp \
logo.cpp
QT += widgets
# install
target.path = $$[QT_INSTALL_EXAMPLES]/opengl/hellogl2
INSTALLS += target

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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "logo.h"
#include <qmath.h>
Logo::Logo()
: m_count(0)
{
m_data.resize(2500 * 6);
const GLfloat x1 = +0.06f;
const GLfloat y1 = -0.14f;
const GLfloat x2 = +0.14f;
const GLfloat y2 = -0.06f;
const GLfloat x3 = +0.08f;
const GLfloat y3 = +0.00f;
const GLfloat x4 = +0.30f;
const GLfloat y4 = +0.22f;
quad(x1, y1, x2, y2, y2, x2, y1, x1);
quad(x3, y3, x4, y4, y4, x4, y3, x3);
extrude(x1, y1, x2, y2);
extrude(x2, y2, y2, x2);
extrude(y2, x2, y1, x1);
extrude(y1, x1, x1, y1);
extrude(x3, y3, x4, y4);
extrude(x4, y4, y4, x4);
extrude(y4, x4, y3, x3);
const int NumSectors = 100;
for (int i = 0; i < NumSectors; ++i) {
GLfloat angle = (i * 2 * M_PI) / NumSectors;
GLfloat angleSin = qSin(angle);
GLfloat angleCos = qCos(angle);
const GLfloat x5 = 0.30f * angleSin;
const GLfloat y5 = 0.30f * angleCos;
const GLfloat x6 = 0.20f * angleSin;
const GLfloat y6 = 0.20f * angleCos;
angle = ((i + 1) * 2 * M_PI) / NumSectors;
angleSin = qSin(angle);
angleCos = qCos(angle);
const GLfloat x7 = 0.20f * angleSin;
const GLfloat y7 = 0.20f * angleCos;
const GLfloat x8 = 0.30f * angleSin;
const GLfloat y8 = 0.30f * angleCos;
quad(x5, y5, x6, y6, x7, y7, x8, y8);
extrude(x6, y6, x7, y7);
extrude(x8, y8, x5, y5);
}
}
void Logo::add(const QVector3D &v, const QVector3D &n)
{
GLfloat *p = m_data.data() + m_count;
*p++ = v.x();
*p++ = v.y();
*p++ = v.z();
*p++ = n.x();
*p++ = n.y();
*p++ = n.z();
m_count += 6;
}
void Logo::quad(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2, GLfloat x3, GLfloat y3, GLfloat x4, GLfloat y4)
{
QVector3D n = QVector3D::normal(QVector3D(x4 - x1, y4 - y1, 0.0f), QVector3D(x2 - x1, y2 - y1, 0.0f));
add(QVector3D(x1, y1, -0.05f), n);
add(QVector3D(x4, y4, -0.05f), n);
add(QVector3D(x2, y2, -0.05f), n);
add(QVector3D(x3, y3, -0.05f), n);
add(QVector3D(x2, y2, -0.05f), n);
add(QVector3D(x4, y4, -0.05f), n);
n = QVector3D::normal(QVector3D(x1 - x4, y1 - y4, 0.0f), QVector3D(x2 - x4, y2 - y4, 0.0f));
add(QVector3D(x4, y4, 0.05f), n);
add(QVector3D(x1, y1, 0.05f), n);
add(QVector3D(x2, y2, 0.05f), n);
add(QVector3D(x2, y2, 0.05f), n);
add(QVector3D(x3, y3, 0.05f), n);
add(QVector3D(x4, y4, 0.05f), n);
}
void Logo::extrude(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2)
{
QVector3D n = QVector3D::normal(QVector3D(0.0f, 0.0f, -0.1f), QVector3D(x2 - x1, y2 - y1, 0.0f));
add(QVector3D(x1, y1, +0.05f), n);
add(QVector3D(x1, y1, -0.05f), n);
add(QVector3D(x2, y2, +0.05f), n);
add(QVector3D(x2, y2, -0.05f), n);
add(QVector3D(x2, y2, +0.05f), n);
add(QVector3D(x1, y1, -0.05f), n);
}

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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef LOGO_H
#define LOGO_H
#include <qopengl.h>
#include <QVector>
#include <QVector3D>
class Logo
{
public:
Logo();
const GLfloat *constData() const { return m_data.constData(); }
int count() const { return m_count; }
int vertexCount() const { return m_count / 6; }
private:
void quad(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2, GLfloat x3, GLfloat y3, GLfloat x4, GLfloat y4);
void extrude(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2);
void add(const QVector3D &v, const QVector3D &n);
QVector<GLfloat> m_data;
int m_count;
};
#endif // LOGO_H

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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QApplication>
#include <QDesktopWidget>
#include <QSurfaceFormat>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QSurfaceFormat fmt;
fmt.setDepthBufferSize(24);
if (QCoreApplication::arguments().contains(QStringLiteral("--multisample")))
fmt.setSamples(4);
if (QCoreApplication::arguments().contains(QStringLiteral("--coreprofile"))) {
fmt.setVersion(3, 2);
fmt.setProfile(QSurfaceFormat::CoreProfile);
}
QSurfaceFormat::setDefaultFormat(fmt);
MainWindow mainWindow;
mainWindow.resize(mainWindow.sizeHint());
int desktopArea = QApplication::desktop()->width() *
QApplication::desktop()->height();
int widgetArea = mainWindow.width() * mainWindow.height();
if (((float)widgetArea / (float)desktopArea) < 0.75f)
mainWindow.show();
else
mainWindow.showMaximized();
return app.exec();
}

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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "mainwindow.h"
#include "window.h"
#include <QMenuBar>
#include <QMenu>
#include <QMessageBox>
MainWindow::MainWindow()
{
QMenuBar *menuBar = new QMenuBar;
QMenu *menuWindow = menuBar->addMenu(tr("&Window"));
QAction *addNew = new QAction(menuWindow);
addNew->setText(tr("Add new"));
menuWindow->addAction(addNew);
connect(addNew, SIGNAL(triggered()), this, SLOT(onAddNew()));
setMenuBar(menuBar);
onAddNew();
}
void MainWindow::onAddNew()
{
if (!centralWidget())
setCentralWidget(new Window(this));
else
QMessageBox::information(0, tr("Cannot add new window"), tr("Already occupied. Undock first."));
}

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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow();
private slots:
void onAddNew();
};
#endif

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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "glwidget.h"
#include "window.h"
#include "mainwindow.h"
#include <QSlider>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QKeyEvent>
#include <QPushButton>
#include <QDesktopWidget>
#include <QApplication>
#include <QMessageBox>
Window::Window(MainWindow *mw)
: mainWindow(mw)
{
glWidget = new GLWidget;
xSlider = createSlider();
ySlider = createSlider();
zSlider = createSlider();
connect(xSlider, SIGNAL(valueChanged(int)), glWidget, SLOT(setXRotation(int)));
connect(glWidget, SIGNAL(xRotationChanged(int)), xSlider, SLOT(setValue(int)));
connect(ySlider, SIGNAL(valueChanged(int)), glWidget, SLOT(setYRotation(int)));
connect(glWidget, SIGNAL(yRotationChanged(int)), ySlider, SLOT(setValue(int)));
connect(zSlider, SIGNAL(valueChanged(int)), glWidget, SLOT(setZRotation(int)));
connect(glWidget, SIGNAL(zRotationChanged(int)), zSlider, SLOT(setValue(int)));
QVBoxLayout *mainLayout = new QVBoxLayout;
QHBoxLayout *container = new QHBoxLayout;
container->addWidget(glWidget);
container->addWidget(xSlider);
container->addWidget(ySlider);
container->addWidget(zSlider);
QWidget *w = new QWidget;
w->setLayout(container);
mainLayout->addWidget(w);
dockBtn = new QPushButton(tr("Undock"), this);
connect(dockBtn, SIGNAL(clicked()), this, SLOT(dockUndock()));
mainLayout->addWidget(dockBtn);
setLayout(mainLayout);
xSlider->setValue(15 * 16);
ySlider->setValue(345 * 16);
zSlider->setValue(0 * 16);
setWindowTitle(tr("Hello GL"));
}
QSlider *Window::createSlider()
{
QSlider *slider = new QSlider(Qt::Vertical);
slider->setRange(0, 360 * 16);
slider->setSingleStep(16);
slider->setPageStep(15 * 16);
slider->setTickInterval(15 * 16);
slider->setTickPosition(QSlider::TicksRight);
return slider;
}
void Window::keyPressEvent(QKeyEvent *e)
{
if (e->key() == Qt::Key_Escape)
close();
else
QWidget::keyPressEvent(e);
}
void Window::dockUndock()
{
if (parent()) {
setParent(0);
setAttribute(Qt::WA_DeleteOnClose);
move(QApplication::desktop()->width() / 2 - width() / 2,
QApplication::desktop()->height() / 2 - height() / 2);
dockBtn->setText(tr("Dock"));
show();
} else {
if (!mainWindow->centralWidget()) {
if (mainWindow->isVisible()) {
setAttribute(Qt::WA_DeleteOnClose, false);
dockBtn->setText(tr("Undock"));
mainWindow->setCentralWidget(this);
} else {
QMessageBox::information(0, tr("Cannot dock"), tr("Main window already closed"));
}
} else {
QMessageBox::information(0, tr("Cannot dock"), tr("Main window already occupied"));
}
}
}

78
examples/opengl/hellogl2/window.h Normal file
View File

@ -0,0 +1,78 @@
/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef WINDOW_H
#define WINDOW_H
#include <QWidget>
QT_BEGIN_NAMESPACE
class QSlider;
class QPushButton;
QT_END_NAMESPACE
class GLWidget;
class MainWindow;
class Window : public QWidget
{
Q_OBJECT
public:
Window(MainWindow *mw);
protected:
void keyPressEvent(QKeyEvent *event) Q_DECL_OVERRIDE;
private slots:
void dockUndock();
private:
QSlider *createSlider();
GLWidget *glWidget;
QSlider *xSlider;
QSlider *ySlider;
QSlider *zSlider;
QPushButton *dockBtn;
MainWindow *mainWindow;
};
#endif

46
examples/opengl/hellowindow/hellowindow.cpp
View File

@ -1,6 +1,6 @@
/**************************************************************************** /****************************************************************************
** **
** 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 ** Contact: http://www.qt-project.org/legal
** **
** This file is part of the examples of the Qt Toolkit. ** This file is part of the examples of the Qt Toolkit.
@ -145,29 +145,18 @@ void Renderer::render()
QOpenGLFunctions *f = m_context->functions(); QOpenGLFunctions *f = m_context->functions();
f->glViewport(0, 0, viewSize.width() * surface->devicePixelRatio(), viewSize.height() * surface->devicePixelRatio()); f->glViewport(0, 0, viewSize.width() * surface->devicePixelRatio(), viewSize.height() * surface->devicePixelRatio());
f->glClearColor(0.1f, 0.1f, 0.2f, 1.0f);
f->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); f->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
f->glFrontFace(GL_CW);
f->glCullFace(GL_FRONT);
f->glEnable(GL_CULL_FACE);
f->glEnable(GL_DEPTH_TEST);
QMatrix4x4 modelview; QMatrix4x4 modelview;
modelview.rotate(m_fAngle, 0.0f, 1.0f, 0.0f); modelview.rotate(m_fAngle, 0.0f, 1.0f, 0.0f);
modelview.rotate(m_fAngle, 1.0f, 0.0f, 0.0f); modelview.rotate(m_fAngle, 1.0f, 0.0f, 0.0f);
modelview.rotate(m_fAngle, 0.0f, 0.0f, 1.0f); modelview.rotate(m_fAngle, 0.0f, 0.0f, 1.0f);
modelview.translate(0.0f, -0.2f, 0.0f); modelview.translate(0.0f, -0.2f, 0.0f);
m_program->bind();
m_program->setUniformValue(matrixUniform, modelview); m_program->setUniformValue(matrixUniform, modelview);
m_program->setUniformValue(colorUniform, color); m_program->setUniformValue(colorUniform, color);
paintQtLogo();
m_program->release();
f->glDisable(GL_DEPTH_TEST); m_context->functions()->glDrawArrays(GL_TRIANGLES, 0, vertices.size());
f->glDisable(GL_CULL_FACE);
m_context->swapBuffers(surface); m_context->swapBuffers(surface);
@ -176,17 +165,6 @@ void Renderer::render()
QTimer::singleShot(0, this, SLOT(render())); QTimer::singleShot(0, this, SLOT(render()));
} }
void Renderer::paintQtLogo()
{
m_program->enableAttributeArray(normalAttr);
m_program->enableAttributeArray(vertexAttr);
m_program->setAttributeArray(vertexAttr, vertices.constData());
m_program->setAttributeArray(normalAttr, normals.constData());
m_context->functions()->glDrawArrays(GL_TRIANGLES, 0, vertices.size());
m_program->disableAttributeArray(normalAttr);
m_program->disableAttributeArray(vertexAttr);
}
void Renderer::initialize() void Renderer::initialize()
{ {
QOpenGLShader *vshader = new QOpenGLShader(QOpenGLShader::Vertex, this); QOpenGLShader *vshader = new QOpenGLShader(QOpenGLShader::Vertex, this);
@ -218,6 +196,7 @@ void Renderer::initialize()
m_program->addShader(vshader); m_program->addShader(vshader);
m_program->addShader(fshader); m_program->addShader(fshader);
m_program->link(); m_program->link();
m_program->bind();
vertexAttr = m_program->attributeLocation("vertex"); vertexAttr = m_program->attributeLocation("vertex");
normalAttr = m_program->attributeLocation("normal"); normalAttr = m_program->attributeLocation("normal");
@ -226,6 +205,25 @@ void Renderer::initialize()
m_fAngle = 0; m_fAngle = 0;
createGeometry(); createGeometry();
m_vbo.create();
m_vbo.bind();
const int verticesSize = vertices.count() * 3 * sizeof(GLfloat);
m_vbo.allocate(verticesSize * 2);
m_vbo.write(0, vertices.constData(), verticesSize);
m_vbo.write(verticesSize, normals.constData(), verticesSize);
QOpenGLFunctions *f = m_context->functions();
f->glClearColor(0.1f, 0.1f, 0.2f, 1.0f);
f->glFrontFace(GL_CW);
f->glCullFace(GL_FRONT);
f->glEnable(GL_CULL_FACE);
f->glEnable(GL_DEPTH_TEST);
m_program->enableAttributeArray(vertexAttr);
m_program->enableAttributeArray(normalAttr);
m_program->setAttributeBuffer(vertexAttr, GL_FLOAT, 0, 3);
m_program->setAttributeBuffer(normalAttr, GL_FLOAT, verticesSize, 3);
} }
void Renderer::createGeometry() void Renderer::createGeometry()

10
examples/opengl/hellowindow/hellowindow.h
View File

@ -1,6 +1,6 @@
/**************************************************************************** /****************************************************************************
** **
** 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 ** Contact: http://www.qt-project.org/legal
** **
** This file is part of the examples of the Qt Toolkit. ** This file is part of the examples of the Qt Toolkit.
@ -43,6 +43,7 @@
#include <QColor> #include <QColor>
#include <QMutex> #include <QMutex>
#include <QOpenGLShaderProgram> #include <QOpenGLShaderProgram>
#include <QOpenGLBuffer>
#include <QSharedPointer> #include <QSharedPointer>
#include <QTimer> #include <QTimer>
@ -65,13 +66,13 @@ private slots:
private: private:
void initialize(); void initialize();
qreal m_fAngle;
bool m_showBubbles;
void paintQtLogo();
void createGeometry(); void createGeometry();
void createBubbles(int number); void createBubbles(int number);
void quad(qreal x1, qreal y1, qreal x2, qreal y2, qreal x3, qreal y3, qreal x4, qreal y4); void quad(qreal x1, qreal y1, qreal x2, qreal y2, qreal x3, qreal y3, qreal x4, qreal y4);
void extrude(qreal x1, qreal y1, qreal x2, qreal y2); void extrude(qreal x1, qreal y1, qreal x2, qreal y2);
qreal m_fAngle;
QVector<QVector3D> vertices; QVector<QVector3D> vertices;
QVector<QVector3D> normals; QVector<QVector3D> normals;
int vertexAttr; int vertexAttr;
@ -83,6 +84,7 @@ private:
QSurfaceFormat m_format; QSurfaceFormat m_format;
QOpenGLContext *m_context; QOpenGLContext *m_context;
QOpenGLShaderProgram *m_program; QOpenGLShaderProgram *m_program;
QOpenGLBuffer m_vbo;
QList<HelloWindow *> m_windows; QList<HelloWindow *> m_windows;
int m_currentWindow; int m_currentWindow;

6
examples/opengl/hellowindow/main.cpp
View File

@ -41,7 +41,6 @@
#include "hellowindow.h" #include "hellowindow.h"
#include <qpa/qplatformintegration.h> #include <qpa/qplatformintegration.h>
#include <private/qguiapplication_p.h>
#include <QGuiApplication> #include <QGuiApplication>
#include <QScreen> #include <QScreen>
@ -51,10 +50,7 @@ int main(int argc, char *argv[])
{ {
QGuiApplication app(argc, argv); QGuiApplication app(argc, argv);
QPlatformIntegration *integ = QGuiApplicationPrivate::platformIntegration(); const bool multipleWindows = QGuiApplication::arguments().contains(QStringLiteral("--multiple"));
const bool multipleWindows = integ->hasCapability(QPlatformIntegration::ThreadedOpenGL)
&& integ->hasCapability(QPlatformIntegration::WindowManagement)
&& !QGuiApplication::arguments().contains(QStringLiteral("--single"));
QScreen *screen = QGuiApplication::primaryScreen(); QScreen *screen = QGuiApplication::primaryScreen();

4
examples/opengl/legacy/README Normal file
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@ -0,0 +1,4 @@
This directory contains legacy examples that use the fixed pipeline
and thus are not compatible with OpenGL ES 2.0+ and the core profile of
OpenGL 3.0+. They also rely on the Qt OpenGL module (e.g. QGLWidget) which
is not advisable in new application.

0
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0
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0
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0
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16
examples/opengl/legacy/legacy.pro Normal file
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@ -0,0 +1,16 @@
requires(qtHaveModule(opengl))
TEMPLATE = subdirs
!contains(QT_CONFIG, dynamicgl): !contains(QT_CONFIG, opengles2) {
# legacy desktop-only examples, no dynamic GL support
SUBDIRS = \
grabber \
hellogl \
overpainting \
pbuffers \
framebufferobject2 \
samplebuffers
}
EXAMPLE_FILES = shared

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0
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0
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40
examples/opengl/opengl.pro
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@ -1,30 +1,16 @@
requires(qtHaveModule(opengl))
TEMPLATE = subdirs TEMPLATE = subdirs
contains(QT_CONFIG, dynamicgl) { SUBDIRS = hellowindow \
SUBDIRS = hellowindow \ paintedwindow \
contextinfo \ qopenglwindow
qopenglwidget \
threadedqopenglwidget \ qtHaveModule(widgets) {
qopenglwindow SUBDIRS += contextinfo \
} else: !contains(QT_CONFIG, opengles2) { threadedqopenglwidget \
SUBDIRS = 2dpainting \ 2dpainting \
grabber \ hellogl2
hellogl \
overpainting \ !wince*: SUBDIRS += qopenglwidget \
pbuffers \ cube \
framebufferobject2 \ textures
samplebuffers
} }
!contains(QT_CONFIG, dynamicgl): SUBDIRS += hellowindow \
paintedwindow \
contextinfo \
cube \
textures \
qopenglwidget \
threadedqopenglwidget \
qopenglwindow
EXAMPLE_FILES = shared

6
examples/opengl/qopenglwidget/bubble.cpp
View File

@ -56,15 +56,15 @@ void Bubble::updateCache()
{ {
if (cache) if (cache)
delete cache; delete cache;
cache = new QImage(qRound(radius * 2 + 2), qRound(radius * 2 + 2), QImage::Format_ARGB32); cache = new QImage(qRound(radius * 2 + 2), qRound(radius * 2 + 2), QImage::Format_ARGB32_Premultiplied);
cache->fill(0x00000000); cache->fill(0x00000000);
QPainter p(cache); QPainter p(cache);
p.setRenderHint(QPainter::HighQualityAntialiasing); p.setRenderHint(QPainter::Antialiasing);
QPen pen(Qt::white); QPen pen(Qt::white);
pen.setWidth(2); pen.setWidth(2);
p.setPen(pen); p.setPen(pen);
p.setBrush(brush); p.setBrush(brush);
p.drawEllipse(0, 0, int(2*radius), int(2*radius)); p.drawEllipse(1, 1, int(2*radius), int(2*radius));
} }
//! [0] //! [0]

482
examples/opengl/qopenglwidget/glwidget.cpp
View File

@ -1,46 +1,49 @@
/**************************************************************************** /****************************************************************************
** **
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies). ** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal ** Contact: http://www.qt-project.org/legal
** **
** This file is part of the examples of the Qt Toolkit. ** This file is part of the examples of the Qt Toolkit.
** **
** $QT_BEGIN_LICENSE:BSD$ ** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows: ** You may use this file under the terms of the BSD license as follows:
** **
** "Redistribution and use in source and binary forms, with or without ** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are ** modification, are permitted provided that the following conditions are
** met: ** met:
** * Redistributions of source code must retain the above copyright ** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer. ** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright ** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in ** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the ** the documentation and/or other materials provided with the
** distribution. ** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names ** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived ** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission. ** from this software without specific prior written permission.
** **
** **
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
** **
** $QT_END_LICENSE$ ** $QT_END_LICENSE$
** **
****************************************************************************/ ****************************************************************************/
#include "glwidget.h" #include "glwidget.h"
#include <QPainter> #include <QPainter>
#include <QPaintEngine> #include <QPaintEngine>
#include <QOpenGLShaderProgram>
#include <QOpenGLTexture>
#include <QCoreApplication>
#include <math.h> #include <math.h>
#include "mainwindow.h" #include "mainwindow.h"
@ -50,143 +53,175 @@ const int bubbleNum = 8;
GLWidget::GLWidget(MainWindow *mw, bool button, const QColor &background) GLWidget::GLWidget(MainWindow *mw, bool button, const QColor &background)
: m_mainWindow(mw), : m_mainWindow(mw),
m_showBubbles(true),
m_qtLogo(true),
m_frames(0),
m_program1(0),
m_program2(0),
m_texture(0),
m_transparent(false), m_transparent(false),
m_btn(0), m_btn(0),
m_hasButton(button), m_hasButton(button),
m_background(background) m_background(background)
{ {
QSurfaceFormat format;
format.setDepthBufferSize(24);
format.setStencilBufferSize(8);
setFormat(format);
qtLogo = true;
frames = 0;
m_showBubbles = true;
setMinimumSize(300, 250); setMinimumSize(300, 250);
} }
GLWidget::~GLWidget() GLWidget::~GLWidget()
{ {
qDeleteAll(m_bubbles);
// And now release all OpenGL resources.
makeCurrent();
delete m_texture;
delete m_program1;
delete m_program2;
delete m_vshader1;
delete m_fshader1;
delete m_vshader2;
delete m_fshader2;
m_vbo1.destroy();
m_vbo2.destroy();
doneCurrent();
} }
void GLWidget::setScaling(int scale) { void GLWidget::setScaling(int scale)
{
if (scale > 30) if (scale > 30)
m_fScale = 1 + qreal(scale - 30) / 30 * 0.25; m_fScale = 1 + qreal(scale - 30) / 30 * 0.25;
else if (scale < 30) else if (scale < 30)
m_fScale = 1 - (qreal(30 - scale) / 30 * 0.25); m_fScale = 1 - (qreal(30 - scale) / 30 * 0.25);
else else
m_fScale = 1; m_fScale = 1;
} }
void GLWidget::setLogo() { void GLWidget::setLogo()
qtLogo = true;
}
void GLWidget::setTexture() {
qtLogo = false;
}
void GLWidget::showBubbles(bool bubbles)
{ {
m_showBubbles = bubbles; m_qtLogo = true;
}
void GLWidget::setTexture()
{
m_qtLogo = false;
}
void GLWidget::setShowBubbles(bool bubbles)
{
m_showBubbles = bubbles;
} }
void GLWidget::paintQtLogo() void GLWidget::paintQtLogo()
{ {
program1.enableAttributeArray(normalAttr1); m_program1->enableAttributeArray(m_vertexAttr1);
program1.enableAttributeArray(vertexAttr1); m_program1->enableAttributeArray(m_normalAttr1);
program1.setAttributeArray(vertexAttr1, vertices.constData());
program1.setAttributeArray(normalAttr1, normals.constData()); m_vbo1.bind();
glDrawArrays(GL_TRIANGLES, 0, vertices.size()); // The data in the buffer is placed like this:
program1.disableAttributeArray(normalAttr1); // vertex1.x, vertex1.y, vertex1.z, normal1.x, normal1.y, normal1.z, vertex2.x, ...
program1.disableAttributeArray(vertexAttr1); m_program1->setAttributeBuffer(m_vertexAttr1, GL_FLOAT, 0, 3, 6 * sizeof(GLfloat));
m_program1->setAttributeBuffer(m_normalAttr1, GL_FLOAT, 3 * sizeof(GLfloat), 3, 6 * sizeof(GLfloat));
m_vbo1.release();
glDrawArrays(GL_TRIANGLES, 0, m_vertices.size());
m_program1->disableAttributeArray(m_normalAttr1);
m_program1->disableAttributeArray(m_vertexAttr1);
} }
void GLWidget::paintTexturedCube() void GLWidget::paintTexturedCube()
{ {
glBindTexture(GL_TEXTURE_2D, m_uiTexture); m_texture->bind();
GLfloat afVertices[] = {
-0.5, 0.5, 0.5, 0.5,-0.5,0.5,-0.5,-0.5,0.5,
0.5, -0.5, 0.5, -0.5,0.5,0.5,0.5,0.5,0.5,
-0.5, -0.5, -0.5, 0.5,-0.5,-0.5,-0.5,0.5,-0.5,
0.5, 0.5, -0.5, -0.5,0.5,-0.5,0.5,-0.5,-0.5,
0.5, -0.5, -0.5, 0.5,-0.5,0.5,0.5,0.5,-0.5, if (!m_vbo2.isCreated()) {
0.5, 0.5, 0.5, 0.5,0.5,-0.5,0.5,-0.5,0.5, static GLfloat afVertices[] = {
-0.5, 0.5, -0.5, -0.5,-0.5,0.5,-0.5,-0.5,-0.5, -0.5, 0.5, 0.5, 0.5,-0.5,0.5,-0.5,-0.5,0.5,
-0.5, -0.5, 0.5, -0.5,0.5,-0.5,-0.5,0.5,0.5, 0.5, -0.5, 0.5, -0.5,0.5,0.5,0.5,0.5,0.5,
-0.5, -0.5, -0.5, 0.5,-0.5,-0.5,-0.5,0.5,-0.5,
0.5, 0.5, -0.5, -0.5,0.5,-0.5,0.5,-0.5,-0.5,
0.5, 0.5, -0.5, -0.5, 0.5, 0.5, -0.5, 0.5, -0.5, 0.5, -0.5, -0.5, 0.5,-0.5,0.5,0.5,0.5,-0.5,
-0.5, 0.5, 0.5, 0.5, 0.5, -0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5,0.5,-0.5,0.5,-0.5,0.5,
-0.5, -0.5, -0.5, -0.5, -0.5, 0.5, 0.5, -0.5, -0.5, -0.5, 0.5, -0.5, -0.5,-0.5,0.5,-0.5,-0.5,-0.5,
0.5, -0.5, 0.5, 0.5, -0.5, -0.5, -0.5, -0.5, 0.5 -0.5, -0.5, 0.5, -0.5,0.5,-0.5,-0.5,0.5,0.5,
};
program2.setAttributeArray(vertexAttr2, afVertices, 3);
GLfloat afTexCoord[] = { 0.5, 0.5, -0.5, -0.5, 0.5, 0.5, -0.5, 0.5, -0.5,
0.0f,0.0f, 1.0f,1.0f, 1.0f,0.0f, -0.5, 0.5, 0.5, 0.5, 0.5, -0.5, 0.5, 0.5, 0.5,
1.0f,1.0f, 0.0f,0.0f, 0.0f,1.0f, -0.5, -0.5, -0.5, -0.5, -0.5, 0.5, 0.5, -0.5, -0.5,
1.0f,1.0f, 1.0f,0.0f, 0.0f,1.0f, 0.5, -0.5, 0.5, 0.5, -0.5, -0.5, -0.5, -0.5, 0.5
0.0f,0.0f, 0.0f,1.0f, 1.0f,0.0f, };
1.0f,1.0f, 1.0f,0.0f, 0.0f,1.0f, static GLfloat afTexCoord[] = {
0.0f,0.0f, 0.0f,1.0f, 1.0f,0.0f, 0.0f,0.0f, 1.0f,1.0f, 1.0f,0.0f,
0.0f,0.0f, 1.0f,1.0f, 1.0f,0.0f, 1.0f,1.0f, 0.0f,0.0f, 0.0f,1.0f,
1.0f,1.0f, 0.0f,0.0f, 0.0f,1.0f, 1.0f,1.0f, 1.0f,0.0f, 0.0f,1.0f,
0.0f,0.0f, 0.0f,1.0f, 1.0f,0.0f,
0.0f,1.0f, 1.0f,0.0f, 1.0f,1.0f, 1.0f,1.0f, 1.0f,0.0f, 0.0f,1.0f,
1.0f,0.0f, 0.0f,1.0f, 0.0f,0.0f, 0.0f,0.0f, 0.0f,1.0f, 1.0f,0.0f,
1.0f,0.0f, 1.0f,1.0f, 0.0f,0.0f, 0.0f,0.0f, 1.0f,1.0f, 1.0f,0.0f,
0.0f,1.0f, 0.0f,0.0f, 1.0f,1.0f 1.0f,1.0f, 0.0f,0.0f, 0.0f,1.0f,
};
program2.setAttributeArray(texCoordAttr2, afTexCoord, 2);
GLfloat afNormals[] = { 0.0f,1.0f, 1.0f,0.0f, 1.0f,1.0f,
1.0f,0.0f, 0.0f,1.0f, 0.0f,0.0f,
1.0f,0.0f, 1.0f,1.0f, 0.0f,0.0f,
0.0f,1.0f, 0.0f,0.0f, 1.0f,1.0f
};
0,0,-1, 0,0,-1, 0,0,-1, GLfloat afNormals[] = {
0,0,-1, 0,0,-1, 0,0,-1,
0,0,1, 0,0,1, 0,0,1,
0,0,1, 0,0,1, 0,0,1,
-1,0,0, -1,0,0, -1,0,0, 0,0,-1, 0,0,-1, 0,0,-1,
-1,0,0, -1,0,0, -1,0,0, 0,0,-1, 0,0,-1, 0,0,-1,
1,0,0, 1,0,0, 1,0,0, 0,0,1, 0,0,1, 0,0,1,
1,0,0, 1,0,0, 1,0,0, 0,0,1, 0,0,1, 0,0,1,
0,-1,0, 0,-1,0, 0,-1,0, -1,0,0, -1,0,0, -1,0,0,
0,-1,0, 0,-1,0, 0,-1,0, -1,0,0, -1,0,0, -1,0,0,
0,1,0, 0,1,0, 0,1,0, 1,0,0, 1,0,0, 1,0,0,
0,1,0, 0,1,0, 0,1,0 1,0,0, 1,0,0, 1,0,0,
};
program2.setAttributeArray(normalAttr2, afNormals, 3);
program2.setUniformValue(textureUniform2, 0); // use texture unit 0 0,-1,0, 0,-1,0, 0,-1,0,
0,-1,0, 0,-1,0, 0,-1,0,
0,1,0, 0,1,0, 0,1,0,
0,1,0, 0,1,0, 0,1,0
};
program2.enableAttributeArray(vertexAttr2); m_vbo2.create();
program2.enableAttributeArray(normalAttr2); m_vbo2.bind();
program2.enableAttributeArray(texCoordAttr2); m_vbo2.allocate(36 * 8 * sizeof(GLfloat));
m_vbo2.write(0, afVertices, sizeof(afVertices));
m_vbo2.write(sizeof(afVertices), afTexCoord, sizeof(afTexCoord));
m_vbo2.write(sizeof(afVertices) + sizeof(afTexCoord), afNormals, sizeof(afNormals));
m_vbo2.release();
}
m_program2->setUniformValue(m_textureUniform2, 0); // use texture unit 0
m_program2->enableAttributeArray(m_vertexAttr2);
m_program2->enableAttributeArray(m_normalAttr2);
m_program2->enableAttributeArray(m_texCoordAttr2);
m_vbo2.bind();
// In the buffer we first have 36 vertices (3 floats for each), then 36 texture
// coordinates (2 floats for each), then 36 normals (3 floats for each).
m_program2->setAttributeBuffer(m_vertexAttr2, GL_FLOAT, 0, 3);
m_program2->setAttributeBuffer(m_texCoordAttr2, GL_FLOAT, 36 * 3 * sizeof(GLfloat), 2);
m_program2->setAttributeBuffer(m_normalAttr2, GL_FLOAT, 36 * 5 * sizeof(GLfloat), 3);
m_vbo2.release();
glDrawArrays(GL_TRIANGLES, 0, 36); glDrawArrays(GL_TRIANGLES, 0, 36);
program2.disableAttributeArray(vertexAttr2); m_program2->disableAttributeArray(m_vertexAttr2);
program2.disableAttributeArray(normalAttr2); m_program2->disableAttributeArray(m_normalAttr2);
program2.disableAttributeArray(texCoordAttr2); m_program2->disableAttributeArray(m_texCoordAttr2);
} }
void GLWidget::initializeGL () void GLWidget::initializeGL()
{ {
initializeOpenGLFunctions(); initializeOpenGLFunctions();
glGenTextures(1, &m_uiTexture); m_texture = new QOpenGLTexture(QImage(":/qt.png"));
QImage img = QImage(":/qt.png").convertToFormat(QImage::Format_RGBA8888);
glBindTexture(GL_TEXTURE_2D, m_uiTexture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, img.width(), img.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, img.constBits());
QOpenGLShader *vshader1 = new QOpenGLShader(QOpenGLShader::Vertex, this); m_vshader1 = new QOpenGLShader(QOpenGLShader::Vertex);
const char *vsrc1 = const char *vsrc1 =
"attribute highp vec4 vertex;\n" "attribute highp vec4 vertex;\n"
"attribute mediump vec3 normal;\n" "attribute mediump vec3 normal;\n"
@ -201,26 +236,27 @@ void GLWidget::initializeGL ()
" color = clamp(color, 0.0, 1.0);\n" " color = clamp(color, 0.0, 1.0);\n"
" gl_Position = matrix * vertex;\n" " gl_Position = matrix * vertex;\n"
"}\n"; "}\n";
vshader1->compileSourceCode(vsrc1); m_vshader1->compileSourceCode(vsrc1);
QOpenGLShader *fshader1 = new QOpenGLShader(QOpenGLShader::Fragment, this); m_fshader1 = new QOpenGLShader(QOpenGLShader::Fragment);
const char *fsrc1 = const char *fsrc1 =
"varying mediump vec4 color;\n" "varying mediump vec4 color;\n"
"void main(void)\n" "void main(void)\n"
"{\n" "{\n"
" gl_FragColor = color;\n" " gl_FragColor = color;\n"
"}\n"; "}\n";
fshader1->compileSourceCode(fsrc1); m_fshader1->compileSourceCode(fsrc1);
program1.addShader(vshader1); m_program1 = new QOpenGLShaderProgram;
program1.addShader(fshader1); m_program1->addShader(m_vshader1);
program1.link(); m_program1->addShader(m_fshader1);
m_program1->link();
vertexAttr1 = program1.attributeLocation("vertex"); m_vertexAttr1 = m_program1->attributeLocation("vertex");
normalAttr1 = program1.attributeLocation("normal"); m_normalAttr1 = m_program1->attributeLocation("normal");
matrixUniform1 = program1.uniformLocation("matrix"); m_matrixUniform1 = m_program1->uniformLocation("matrix");
QOpenGLShader *vshader2 = new QOpenGLShader(QOpenGLShader::Vertex); m_vshader2 = new QOpenGLShader(QOpenGLShader::Vertex);
const char *vsrc2 = const char *vsrc2 =
"attribute highp vec4 vertex;\n" "attribute highp vec4 vertex;\n"
"attribute highp vec4 texCoord;\n" "attribute highp vec4 texCoord;\n"
@ -235,9 +271,9 @@ void GLWidget::initializeGL ()
" gl_Position = matrix * vertex;\n" " gl_Position = matrix * vertex;\n"
" texc = texCoord;\n" " texc = texCoord;\n"
"}\n"; "}\n";
vshader2->compileSourceCode(vsrc2); m_vshader2->compileSourceCode(vsrc2);
QOpenGLShader *fshader2 = new QOpenGLShader(QOpenGLShader::Fragment); m_fshader2 = new QOpenGLShader(QOpenGLShader::Fragment);
const char *fsrc2 = const char *fsrc2 =
"varying highp vec4 texc;\n" "varying highp vec4 texc;\n"
"uniform sampler2D tex;\n" "uniform sampler2D tex;\n"
@ -248,35 +284,59 @@ void GLWidget::initializeGL ()
" color = color * 0.2 + color * 0.8 * angle;\n" " color = color * 0.2 + color * 0.8 * angle;\n"
" gl_FragColor = vec4(clamp(color, 0.0, 1.0), 1.0);\n" " gl_FragColor = vec4(clamp(color, 0.0, 1.0), 1.0);\n"
"}\n"; "}\n";
fshader2->compileSourceCode(fsrc2); m_fshader2->compileSourceCode(fsrc2);
program2.addShader(vshader2); m_program2 = new QOpenGLShaderProgram;
program2.addShader(fshader2); m_program2->addShader(m_vshader2);
program2.link(); m_program2->addShader(m_fshader2);
m_program2->link();
vertexAttr2 = program2.attributeLocation("vertex"); m_vertexAttr2 = m_program2->attributeLocation("vertex");
normalAttr2 = program2.attributeLocation("normal"); m_normalAttr2 = m_program2->attributeLocation("normal");
texCoordAttr2 = program2.attributeLocation("texCoord"); m_texCoordAttr2 = m_program2->attributeLocation("texCoord");
matrixUniform2 = program2.uniformLocation("matrix"); m_matrixUniform2 = m_program2->uniformLocation("matrix");
textureUniform2 = program2.uniformLocation("tex"); m_textureUniform2 = m_program2->uniformLocation("tex");
m_fAngle = 0; m_fAngle = 0;
m_fScale = 1; m_fScale = 1;
createGeometry(); createGeometry();
createBubbles(bubbleNum - bubbles.count());
// Use a vertex buffer object. Client-side pointers are old-school and should be avoided.
m_vbo1.create();
m_vbo1.bind();
// For the cube all the data belonging to the texture coordinates and
// normals is placed separately, after the vertices. Here, for the Qt logo,
// let's do something different and potentially more efficient: create a
// properly interleaved data set.
const int vertexCount = m_vertices.count();
QVector<GLfloat> buf;
buf.resize(vertexCount * 3 * 2);
GLfloat *p = buf.data();
for (int i = 0; i < vertexCount; ++i) {
*p++ = m_vertices[i].x();
*p++ = m_vertices[i].y();
*p++ = m_vertices[i].z();
*p++ = m_normals[i].x();
*p++ = m_normals[i].y();
*p++ = m_normals[i].z();
}
m_vbo1.allocate(buf.constData(), buf.count() * sizeof(GLfloat));
m_vbo1.release();
createBubbles(bubbleNum - m_bubbles.count());
} }
void GLWidget::paintGL() void GLWidget::paintGL()
{ {
createBubbles(bubbleNum - bubbles.count()); createBubbles(bubbleNum - m_bubbles.count());
QPainter painter; QPainter painter;
painter.begin(this); painter.begin(this);
painter.beginNativePainting(); painter.beginNativePainting();
glClearColor(m_background.red() / 255.0f, m_background.green() / 255.0f, glClearColor(m_background.redF(), m_background.greenF(), m_background.blueF(), m_transparent ? 0.0f : 1.0f);
m_background.blue() / 255.0f, m_transparent ? 0.0f : 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glFrontFace(GL_CW); glFrontFace(GL_CW);
@ -291,16 +351,16 @@ void GLWidget::paintGL()
modelview.scale(m_fScale); modelview.scale(m_fScale);
modelview.translate(0.0f, -0.2f, 0.0f); modelview.translate(0.0f, -0.2f, 0.0f);
if (qtLogo) { if (m_qtLogo) {
program1.bind(); m_program1->bind();
program1.setUniformValue(matrixUniform1, modelview); m_program1->setUniformValue(m_matrixUniform1, modelview);
paintQtLogo(); paintQtLogo();
program1.release(); m_program1->release();
} else { } else {
program2.bind(); m_program2->bind();
program1.setUniformValue(matrixUniform2, modelview); m_program2->setUniformValue(m_matrixUniform2, modelview);
paintTexturedCube(); paintTexturedCube();
program2.release(); m_program2->release();
} }
glDisable(GL_DEPTH_TEST); glDisable(GL_DEPTH_TEST);
@ -309,50 +369,50 @@ void GLWidget::paintGL()
painter.endNativePainting(); painter.endNativePainting();
if (m_showBubbles) if (m_showBubbles)
foreach (Bubble *bubble, bubbles) { foreach (Bubble *bubble, m_bubbles) {
bubble->drawBubble(&painter); bubble->drawBubble(&painter);
} }
if (const int elapsed = time.elapsed()) { if (const int elapsed = m_time.elapsed()) {
QString framesPerSecond; QString framesPerSecond;
framesPerSecond.setNum(frames /(elapsed / 1000.0), 'f', 2); framesPerSecond.setNum(m_frames /(elapsed / 1000.0), 'f', 2);
painter.setPen(m_transparent ? Qt::black : Qt::white); painter.setPen(m_transparent ? Qt::black : Qt::white);
painter.drawText(20, 40, framesPerSecond + " paintGL calls / s"); painter.drawText(20, 40, framesPerSecond + " paintGL calls / s");
} }
painter.end(); painter.end();
QMutableListIterator<Bubble*> iter(bubbles); QMutableListIterator<Bubble*> iter(m_bubbles);
while (iter.hasNext()) { while (iter.hasNext()) {
Bubble *bubble = iter.next(); Bubble *bubble = iter.next();
bubble->move(rect()); bubble->move(rect());
} }
if (!(frames % 100)) { if (!(m_frames % 100)) {
time.start(); m_time.start();
frames = 0; m_frames = 0;
} }
m_fAngle += 1.0f; m_fAngle += 1.0f;
frames ++; ++m_frames;
} }
void GLWidget::createBubbles(int number) void GLWidget::createBubbles(int number)
{ {
for (int i = 0; i < number; ++i) { for (int i = 0; i < number; ++i) {
QPointF position(width()*(0.1 + (0.8*qrand()/(RAND_MAX+1.0))), QPointF position(width()*(0.1 + (0.8*qrand()/(RAND_MAX+1.0))),
height()*(0.1 + (0.8*qrand()/(RAND_MAX+1.0)))); height()*(0.1 + (0.8*qrand()/(RAND_MAX+1.0))));
qreal radius = qMin(width(), height())*(0.0175 + 0.0875*qrand()/(RAND_MAX+1.0)); qreal radius = qMin(width(), height())*(0.0175 + 0.0875*qrand()/(RAND_MAX+1.0));
QPointF velocity(width()*0.0175*(-0.5 + qrand()/(RAND_MAX+1.0)), QPointF velocity(width()*0.0175*(-0.5 + qrand()/(RAND_MAX+1.0)),
height()*0.0175*(-0.5 + qrand()/(RAND_MAX+1.0))); height()*0.0175*(-0.5 + qrand()/(RAND_MAX+1.0)));
bubbles.append(new Bubble(position, radius, velocity)); m_bubbles.append(new Bubble(position, radius, velocity));
} }
} }
void GLWidget::createGeometry() void GLWidget::createGeometry()
{ {
vertices.clear(); m_vertices.clear();
normals.clear(); m_normals.clear();
qreal x1 = +0.06f; qreal x1 = +0.06f;
qreal y1 = -0.14f; qreal y1 = -0.14f;
@ -396,71 +456,71 @@ void GLWidget::createGeometry()
extrude(x8, y8, x5, y5); extrude(x8, y8, x5, y5);
} }
for (int i = 0;i < vertices.size();i++) for (int i = 0;i < m_vertices.size();i++)
vertices[i] *= 2.0f; m_vertices[i] *= 2.0f;
} }
void GLWidget::quad(qreal x1, qreal y1, qreal x2, qreal y2, qreal x3, qreal y3, qreal x4, qreal y4) void GLWidget::quad(qreal x1, qreal y1, qreal x2, qreal y2, qreal x3, qreal y3, qreal x4, qreal y4)
{ {
vertices << QVector3D(x1, y1, -0.05f); m_vertices << QVector3D(x1, y1, -0.05f);
vertices << QVector3D(x2, y2, -0.05f); m_vertices << QVector3D(x2, y2, -0.05f);
vertices << QVector3D(x4, y4, -0.05f); m_vertices << QVector3D(x4, y4, -0.05f);
vertices << QVector3D(x3, y3, -0.05f); m_vertices << QVector3D(x3, y3, -0.05f);
vertices << QVector3D(x4, y4, -0.05f); m_vertices << QVector3D(x4, y4, -0.05f);
vertices << QVector3D(x2, y2, -0.05f); m_vertices << QVector3D(x2, y2, -0.05f);
QVector3D n = QVector3D::normal QVector3D n = QVector3D::normal
(QVector3D(x2 - x1, y2 - y1, 0.0f), QVector3D(x4 - x1, y4 - y1, 0.0f)); (QVector3D(x2 - x1, y2 - y1, 0.0f), QVector3D(x4 - x1, y4 - y1, 0.0f));
normals << n; m_normals << n;
normals << n; m_normals << n;
normals << n; m_normals << n;
normals << n; m_normals << n;
normals << n; m_normals << n;
normals << n; m_normals << n;
vertices << QVector3D(x4, y4, 0.05f); m_vertices << QVector3D(x4, y4, 0.05f);
vertices << QVector3D(x2, y2, 0.05f); m_vertices << QVector3D(x2, y2, 0.05f);
vertices << QVector3D(x1, y1, 0.05f); m_vertices << QVector3D(x1, y1, 0.05f);
vertices << QVector3D(x2, y2, 0.05f); m_vertices << QVector3D(x2, y2, 0.05f);
vertices << QVector3D(x4, y4, 0.05f); m_vertices << QVector3D(x4, y4, 0.05f);
vertices << QVector3D(x3, y3, 0.05f); m_vertices << QVector3D(x3, y3, 0.05f);
n = QVector3D::normal n = QVector3D::normal
(QVector3D(x2 - x4, y2 - y4, 0.0f), QVector3D(x1 - x4, y1 - y4, 0.0f)); (QVector3D(x2 - x4, y2 - y4, 0.0f), QVector3D(x1 - x4, y1 - y4, 0.0f));
normals << n; m_normals << n;
normals << n; m_normals << n;
normals << n; m_normals << n;
normals << n; m_normals << n;
normals << n; m_normals << n;
normals << n; m_normals << n;
} }
void GLWidget::extrude(qreal x1, qreal y1, qreal x2, qreal y2) void GLWidget::extrude(qreal x1, qreal y1, qreal x2, qreal y2)
{ {
vertices << QVector3D(x1, y1, +0.05f); m_vertices << QVector3D(x1, y1, +0.05f);
vertices << QVector3D(x2, y2, +0.05f); m_vertices << QVector3D(x2, y2, +0.05f);
vertices << QVector3D(x1, y1, -0.05f); m_vertices << QVector3D(x1, y1, -0.05f);
vertices << QVector3D(x2, y2, -0.05f); m_vertices << QVector3D(x2, y2, -0.05f);
vertices << QVector3D(x1, y1, -0.05f); m_vertices << QVector3D(x1, y1, -0.05f);
vertices << QVector3D(x2, y2, +0.05f); m_vertices << QVector3D(x2, y2, +0.05f);
QVector3D n = QVector3D::normal QVector3D n = QVector3D::normal
(QVector3D(x2 - x1, y2 - y1, 0.0f), QVector3D(0.0f, 0.0f, -0.1f)); (QVector3D(x2 - x1, y2 - y1, 0.0f), QVector3D(0.0f, 0.0f, -0.1f));
normals << n; m_normals << n;
normals << n; m_normals << n;
normals << n; m_normals << n;
normals << n; m_normals << n;
normals << n; m_normals << n;
normals << n; m_normals << n;
} }
void GLWidget::setTransparent(bool transparent) void GLWidget::setTransparent(bool transparent)

57
examples/opengl/qopenglwidget/glwidget.h
View File

@ -43,7 +43,7 @@
#include <QOpenGLWidget> #include <QOpenGLWidget>
#include <QOpenGLFunctions> #include <QOpenGLFunctions>
#include <QOpenGLShaderProgram> #include <QOpenGLBuffer>
#include <QVector3D> #include <QVector3D>
#include <QMatrix4x4> #include <QMatrix4x4>
#include <QTime> #include <QTime>
@ -53,6 +53,10 @@
class Bubble; class Bubble;
class MainWindow; class MainWindow;
QT_FORWARD_DECLARE_CLASS(QOpenGLTexture)
QT_FORWARD_DECLARE_CLASS(QOpenGLShader)
QT_FORWARD_DECLARE_CLASS(QOpenGLShaderProgram)
class GLWidget : public QOpenGLWidget, protected QOpenGLFunctions class GLWidget : public QOpenGLWidget, protected QOpenGLFunctions
{ {
Q_OBJECT Q_OBJECT
@ -64,7 +68,7 @@ public slots:
void setScaling(int scale); void setScaling(int scale);
void setLogo(); void setLogo();
void setTexture(); void setTexture();
void showBubbles(bool); void setShowBubbles(bool);
void setTransparent(bool transparent); void setTransparent(bool transparent);
private slots: private slots:
@ -76,33 +80,40 @@ protected:
void initializeGL() Q_DECL_OVERRIDE; void initializeGL() Q_DECL_OVERRIDE;
private: private:
MainWindow *m_mainWindow;
GLuint m_uiTexture;
qreal m_fAngle;
qreal m_fScale;
bool m_showBubbles;
void paintTexturedCube(); void paintTexturedCube();
void paintQtLogo(); void paintQtLogo();
void createGeometry(); void createGeometry();
void createBubbles(int number); void createBubbles(int number);
void quad(qreal x1, qreal y1, qreal x2, qreal y2, qreal x3, qreal y3, qreal x4, qreal y4); void quad(qreal x1, qreal y1, qreal x2, qreal y2, qreal x3, qreal y3, qreal x4, qreal y4);
void extrude(qreal x1, qreal y1, qreal x2, qreal y2); void extrude(qreal x1, qreal y1, qreal x2, qreal y2);
QVector<QVector3D> vertices;
QVector<QVector3D> normals; MainWindow *m_mainWindow;
bool qtLogo; qreal m_fAngle;
QList<Bubble*> bubbles; qreal m_fScale;
int frames; bool m_showBubbles;
QTime time; QVector<QVector3D> m_vertices;
QOpenGLShaderProgram program1; QVector<QVector3D> m_normals;
QOpenGLShaderProgram program2; bool m_qtLogo;
int vertexAttr1; QList<Bubble *> m_bubbles;
int normalAttr1; int m_frames;
int matrixUniform1; QTime m_time;
int vertexAttr2; QOpenGLShader *m_vshader1;
int normalAttr2; QOpenGLShader *m_fshader1;
int texCoordAttr2; QOpenGLShader *m_vshader2;
int matrixUniform2; QOpenGLShader *m_fshader2;
int textureUniform2; QOpenGLShaderProgram *m_program1;
QOpenGLShaderProgram *m_program2;
QOpenGLTexture *m_texture;
QOpenGLBuffer m_vbo1;
QOpenGLBuffer m_vbo2;
int m_vertexAttr1;
int m_normalAttr1;
int m_matrixUniform1;
int m_vertexAttr2;
int m_normalAttr2;
int m_texCoordAttr2;
int m_matrixUniform2;
int m_textureUniform2;
bool m_transparent; bool m_transparent;
QPushButton *m_btn; QPushButton *m_btn;
bool m_hasButton; bool m_hasButton;

9
examples/opengl/qopenglwidget/main.cpp
View File

@ -40,12 +40,21 @@
#include <QApplication> #include <QApplication>
#include <QMainWindow> #include <QMainWindow>
#include <QSurfaceFormat>
#include "mainwindow.h" #include "mainwindow.h"
int main( int argc, char ** argv ) int main( int argc, char ** argv )
{ {
Q_INIT_RESOURCE(texture); Q_INIT_RESOURCE(texture);
QApplication a( argc, argv ); QApplication a( argc, argv );
QSurfaceFormat format;
format.setDepthBufferSize(24);
format.setStencilBufferSize(8);
if (QCoreApplication::arguments().contains(QStringLiteral("--multisample")))
format.setSamples(4);
QSurfaceFormat::setDefaultFormat(format);
MainWindow mw; MainWindow mw;
mw.showMaximized(); mw.showMaximized();
return a.exec(); return a.exec();

2
examples/opengl/qopenglwidget/mainwindow.cpp
View File

@ -121,7 +121,7 @@ MainWindow::MainWindow()
connect(showLogo, SIGNAL(triggered(bool)), glwidget, SLOT(setLogo())); connect(showLogo, SIGNAL(triggered(bool)), glwidget, SLOT(setLogo()));
connect(showTexture, SIGNAL(triggered(bool)), glwidget, SLOT(setTexture())); connect(showTexture, SIGNAL(triggered(bool)), glwidget, SLOT(setTexture()));
connect(showBubbles, SIGNAL(triggered(bool)), glwidget, SLOT(showBubbles(bool))); connect(showBubbles, SIGNAL(triggered(bool)), glwidget, SLOT(setShowBubbles(bool)));
connect(slider, SIGNAL(valueChanged(int)), glwidget, SLOT(setScaling(int))); connect(slider, SIGNAL(valueChanged(int)), glwidget, SLOT(setScaling(int)));
connect(transparent, &QCheckBox::toggled, glwidget, &GLWidget::setTransparent); connect(transparent, &QCheckBox::toggled, glwidget, &GLWidget::setTransparent);

76
examples/opengl/textures/glwidget.cpp
View File

@ -1,6 +1,6 @@
/**************************************************************************** /****************************************************************************
** **
** 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 ** Contact: http://www.qt-project.org/legal
** **
** This file is part of the examples of the Qt Toolkit. ** This file is part of the examples of the Qt Toolkit.
@ -38,23 +38,30 @@
** **
****************************************************************************/ ****************************************************************************/
#include <QtWidgets>
#include <QtOpenGL>
#include "glwidget.h" #include "glwidget.h"
#include <QOpenGLShaderProgram>
#include <QOpenGLTexture>
#include <QMouseEvent>
GLWidget::GLWidget(QWidget *parent, QGLWidget *shareWidget) GLWidget::GLWidget(QWidget *parent)
: QGLWidget(parent, shareWidget) : QOpenGLWidget(parent),
clearColor(Qt::black),
xRot(0),
yRot(0),
zRot(0),
program(0)
{ {
clearColor = Qt::black; memset(textures, 0, sizeof(textures));
xRot = 0;
yRot = 0;
zRot = 0;
program = 0;
} }
GLWidget::~GLWidget() GLWidget::~GLWidget()
{ {
makeCurrent();
vbo.destroy();
for (int i = 0; i < 6; ++i)
delete textures[i];
delete program;
doneCurrent();
} }
QSize GLWidget::minimumSizeHint() const QSize GLWidget::minimumSizeHint() const
@ -72,13 +79,13 @@ void GLWidget::rotateBy(int xAngle, int yAngle, int zAngle)
xRot += xAngle; xRot += xAngle;
yRot += yAngle; yRot += yAngle;
zRot += zAngle; zRot += zAngle;
updateGL(); update();
} }
void GLWidget::setClearColor(const QColor &color) void GLWidget::setClearColor(const QColor &color)
{ {
clearColor = color; clearColor = color;
updateGL(); update();
} }
void GLWidget::initializeGL() void GLWidget::initializeGL()
@ -89,14 +96,11 @@ void GLWidget::initializeGL()
glEnable(GL_DEPTH_TEST); glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE); glEnable(GL_CULL_FACE);
#ifdef GL_TEXTURE_2D
glEnable(GL_TEXTURE_2D);
#endif
#define PROGRAM_VERTEX_ATTRIBUTE 0 #define PROGRAM_VERTEX_ATTRIBUTE 0
#define PROGRAM_TEXCOORD_ATTRIBUTE 1 #define PROGRAM_TEXCOORD_ATTRIBUTE 1
QGLShader *vshader = new QGLShader(QGLShader::Vertex, this); QOpenGLShader *vshader = new QOpenGLShader(QOpenGLShader::Vertex, this);
const char *vsrc = const char *vsrc =
"attribute highp vec4 vertex;\n" "attribute highp vec4 vertex;\n"
"attribute mediump vec4 texCoord;\n" "attribute mediump vec4 texCoord;\n"
@ -109,7 +113,7 @@ void GLWidget::initializeGL()
"}\n"; "}\n";
vshader->compileSourceCode(vsrc); vshader->compileSourceCode(vsrc);
QGLShader *fshader = new QGLShader(QGLShader::Fragment, this); QOpenGLShader *fshader = new QOpenGLShader(QOpenGLShader::Fragment, this);
const char *fsrc = const char *fsrc =
"uniform sampler2D texture;\n" "uniform sampler2D texture;\n"
"varying mediump vec4 texc;\n" "varying mediump vec4 texc;\n"
@ -119,7 +123,7 @@ void GLWidget::initializeGL()
"}\n"; "}\n";
fshader->compileSourceCode(fsrc); fshader->compileSourceCode(fsrc);
program = new QGLShaderProgram(this); program = new QOpenGLShaderProgram;
program->addShader(vshader); program->addShader(vshader);
program->addShader(fshader); program->addShader(fshader);
program->bindAttributeLocation("vertex", PROGRAM_VERTEX_ATTRIBUTE); program->bindAttributeLocation("vertex", PROGRAM_VERTEX_ATTRIBUTE);
@ -132,7 +136,7 @@ void GLWidget::initializeGL()
void GLWidget::paintGL() void GLWidget::paintGL()
{ {
qglClearColor(clearColor); glClearColor(clearColor.redF(), clearColor.greenF(), clearColor.blueF(), clearColor.alphaF());
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
QMatrix4x4 m; QMatrix4x4 m;
@ -145,17 +149,14 @@ void GLWidget::paintGL()
program->setUniformValue("matrix", m); program->setUniformValue("matrix", m);
program->enableAttributeArray(PROGRAM_VERTEX_ATTRIBUTE); program->enableAttributeArray(PROGRAM_VERTEX_ATTRIBUTE);
program->enableAttributeArray(PROGRAM_TEXCOORD_ATTRIBUTE); program->enableAttributeArray(PROGRAM_TEXCOORD_ATTRIBUTE);
program->setAttributeArray program->setAttributeBuffer(PROGRAM_VERTEX_ATTRIBUTE, GL_FLOAT, 0, 3, 5 * sizeof(GLfloat));
(PROGRAM_VERTEX_ATTRIBUTE, vertices.constData()); program->setAttributeBuffer(PROGRAM_TEXCOORD_ATTRIBUTE, GL_FLOAT, 3 * sizeof(GLfloat), 2, 5 * sizeof(GLfloat));
program->setAttributeArray
(PROGRAM_TEXCOORD_ATTRIBUTE, texCoords.constData());
for (int i = 0; i < 6; ++i) { for (int i = 0; i < 6; ++i) {
glBindTexture(GL_TEXTURE_2D, textures[i]); textures[i]->bind();
glDrawArrays(GL_TRIANGLE_FAN, i * 4, 4); glDrawArrays(GL_TRIANGLE_FAN, i * 4, 4);
} }
} }
void GLWidget::resizeGL(int width, int height) void GLWidget::resizeGL(int width, int height)
{ {
int side = qMin(width, height); int side = qMin(width, height);
@ -196,18 +197,23 @@ void GLWidget::makeObject()
{ { -1, -1, +1 }, { +1, -1, +1 }, { +1, +1, +1 }, { -1, +1, +1 } } { { -1, -1, +1 }, { +1, -1, +1 }, { +1, +1, +1 }, { -1, +1, +1 } }
}; };
for (int j=0; j < 6; ++j) { for (int j = 0; j < 6; ++j)
textures[j] = bindTexture textures[j] = new QOpenGLTexture(QImage(QString(":/images/side%1.png").arg(j + 1)).mirrored());
(QPixmap(QString(":/images/side%1.png").arg(j + 1)), GL_TEXTURE_2D);
}
QVector<GLfloat> vertData;
for (int i = 0; i < 6; ++i) { for (int i = 0; i < 6; ++i) {
for (int j = 0; j < 4; ++j) { for (int j = 0; j < 4; ++j) {
texCoords.append // vertex position
(QVector2D(j == 0 || j == 3, j == 0 || j == 1)); vertData.append(0.2 * coords[i][j][0]);
vertices.append vertData.append(0.2 * coords[i][j][1]);
(QVector3D(0.2 * coords[i][j][0], 0.2 * coords[i][j][1], vertData.append(0.2 * coords[i][j][2]);
0.2 * coords[i][j][2])); // texture coordinate
vertData.append(j == 0 || j == 3);
vertData.append(j == 0 || j == 1);
} }
} }
vbo.create();
vbo.bind();
vbo.allocate(vertData.constData(), vertData.count() * sizeof(GLfloat));
} }

20
examples/opengl/textures/glwidget.h
View File

@ -1,6 +1,6 @@
/**************************************************************************** /****************************************************************************
** **
** 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 ** Contact: http://www.qt-project.org/legal
** **
** This file is part of the examples of the Qt Toolkit. ** This file is part of the examples of the Qt Toolkit.
@ -41,18 +41,19 @@
#ifndef GLWIDGET_H #ifndef GLWIDGET_H
#define GLWIDGET_H #define GLWIDGET_H
#include <QtWidgets> #include <QOpenGLWidget>
#include <QGLWidget>
#include <QOpenGLFunctions> #include <QOpenGLFunctions>
#include <QOpenGLBuffer>
QT_FORWARD_DECLARE_CLASS(QGLShaderProgram); QT_FORWARD_DECLARE_CLASS(QOpenGLShaderProgram);
QT_FORWARD_DECLARE_CLASS(QOpenGLTexture)
class GLWidget : public QGLWidget, protected QOpenGLFunctions class GLWidget : public QOpenGLWidget, protected QOpenGLFunctions
{ {
Q_OBJECT Q_OBJECT
public: public:
explicit GLWidget(QWidget *parent = 0, QGLWidget *shareWidget = 0); explicit GLWidget(QWidget *parent = 0);
~GLWidget(); ~GLWidget();
QSize minimumSizeHint() const Q_DECL_OVERRIDE; QSize minimumSizeHint() const Q_DECL_OVERRIDE;
@ -79,10 +80,9 @@ private:
int xRot; int xRot;
int yRot; int yRot;
int zRot; int zRot;
GLuint textures[6]; QOpenGLTexture *textures[6];
QVector<QVector3D> vertices; QOpenGLShaderProgram *program;
QVector<QVector2D> texCoords; QOpenGLBuffer vbo;
QGLShaderProgram *program;
}; };
#endif #endif

8
examples/opengl/textures/main.cpp
View File

@ -1,6 +1,6 @@
/**************************************************************************** /****************************************************************************
** **
** 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 ** Contact: http://www.qt-project.org/legal
** **
** This file is part of the examples of the Qt Toolkit. ** This file is part of the examples of the Qt Toolkit.
@ -39,6 +39,7 @@
****************************************************************************/ ****************************************************************************/
#include <QApplication> #include <QApplication>
#include <QSurfaceFormat>
#include "window.h" #include "window.h"
@ -47,6 +48,11 @@ int main(int argc, char *argv[])
Q_INIT_RESOURCE(textures); Q_INIT_RESOURCE(textures);
QApplication app(argc, argv); QApplication app(argc, argv);
QSurfaceFormat format;
format.setDepthBufferSize(24);
QSurfaceFormat::setDefaultFormat(format);
Window window; Window window;
window.show(); window.show();
return app.exec(); return app.exec();

4
examples/opengl/textures/textures.pro
View File

@ -3,8 +3,10 @@ HEADERS = glwidget.h \
SOURCES = glwidget.cpp \ SOURCES = glwidget.cpp \
main.cpp \ main.cpp \
window.cpp window.cpp
RESOURCES = textures.qrc RESOURCES = textures.qrc
QT += opengl widgets
QT += widgets
# install # install
target.path = $$[QT_INSTALL_EXAMPLES]/opengl/textures target.path = $$[QT_INSTALL_EXAMPLES]/opengl/textures

4
examples/opengl/textures/window.cpp
View File

@ -1,6 +1,6 @@
/**************************************************************************** /****************************************************************************
** **
** 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 ** Contact: http://www.qt-project.org/legal
** **
** This file is part of the examples of the Qt Toolkit. ** This file is part of the examples of the Qt Toolkit.
@ -54,7 +54,7 @@ Window::Window()
/ (NumRows * NumColumns - 1), / (NumRows * NumColumns - 1),
255, 63); 255, 63);
glWidgets[i][j] = new GLWidget(0, 0); glWidgets[i][j] = new GLWidget;
glWidgets[i][j]->setClearColor(clearColor); glWidgets[i][j]->setClearColor(clearColor);
glWidgets[i][j]->rotateBy(+42 * 16, +42 * 16, -21 * 16); glWidgets[i][j]->rotateBy(+42 * 16, +42 * 16, -21 * 16);
mainLayout->addWidget(glWidgets[i][j], i, j); mainLayout->addWidget(glWidgets[i][j], i, j);

2
examples/opengl/textures/window.h
View File

@ -1,6 +1,6 @@
/**************************************************************************** /****************************************************************************
** **
** 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 ** Contact: http://www.qt-project.org/legal
** **
** This file is part of the examples of the Qt Toolkit. ** This file is part of the examples of the Qt Toolkit.

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