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authorSamuel Rødal <samuel.rodal@nokia.com>2012-06-05 13:21:55 +0200
committerQt by Nokia <qt-info@nokia.com>2012-08-29 16:53:00 +0200
commitf3b45ffa6159bc8b7ecfb0578bbb5cb826de1338 (patch)
treec3a44c048086fc95081e8c19c3e5502c4f189ae0 /examples
parent49c251e0543ea80e69d1725bb08bb4dfe3f225ab (diff)
Added OpenGL example and documentation.
Change-Id: I2d9d4e52caf0a39fef9648d8a9e83a0c1328f650 Reviewed-by: Paul Olav Tvete <paul.tvete@nokia.com>
Diffstat (limited to 'examples')
-rw-r--r--examples/examples.pro1
-rw-r--r--examples/gui/gui.pro2
-rw-r--r--examples/gui/openglwindow/main.cpp179
-rw-r--r--examples/gui/openglwindow/openglwindow.cpp169
-rw-r--r--examples/gui/openglwindow/openglwindow.h83
-rw-r--r--examples/gui/openglwindow/openglwindow.pri3
-rw-r--r--examples/gui/openglwindow/openglwindow.pro7
7 files changed, 443 insertions, 1 deletions
diff --git a/examples/examples.pro b/examples/examples.pro
index 29eda7dff5..a0afb5613c 100644
--- a/examples/examples.pro
+++ b/examples/examples.pro
@@ -2,6 +2,7 @@ TEMPLATE = subdirs
CONFIG += no_docs_target
SUBDIRS = \
+ gui \
network \
threads \
xml \
diff --git a/examples/gui/gui.pro b/examples/gui/gui.pro
index 168379b4ea..baf5d7f3f3 100644
--- a/examples/gui/gui.pro
+++ b/examples/gui/gui.pro
@@ -2,4 +2,4 @@ TEMPLATE = subdirs
SUBDIRS += analogclock
SUBDIRS += rasterwindow
-
+SUBDIRS += openglwindow
diff --git a/examples/gui/openglwindow/main.cpp b/examples/gui/openglwindow/main.cpp
new file mode 100644
index 0000000000..554e54c2e7
--- /dev/null
+++ b/examples/gui/openglwindow/main.cpp
@@ -0,0 +1,179 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the documentation 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 Nokia Corporation 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 "openglwindow.h"
+
+#include <QtGui/QGuiApplication>
+#include <QtGui/QMatrix4x4>
+#include <QtGui/QOpenGLShaderProgram>
+#include <QtGui/QScreen>
+
+#include <QtCore/qmath.h>
+
+//! [1]
+class TriangleWindow : public OpenGLWindow
+{
+public:
+ TriangleWindow();
+
+ void initialize();
+ void render();
+
+private:
+ GLuint loadShader(GLenum type, const char *source);
+
+ GLuint m_posAttr;
+ GLuint m_colAttr;
+ GLuint m_matrixUniform;
+
+ QOpenGLShaderProgram *m_program;
+ int m_frame;
+};
+
+TriangleWindow::TriangleWindow()
+ : m_program(0)
+ , m_frame(0)
+{
+}
+//! [1]
+
+//! [2]
+int main(int argc, char **argv)
+{
+ QGuiApplication app(argc, argv);
+
+ QSurfaceFormat format;
+ format.setSamples(4);
+
+ TriangleWindow window;
+ window.setFormat(format);
+ window.resize(640, 480);
+ window.show();
+
+ window.setAnimating(true);
+
+ return app.exec();
+}
+//! [2]
+
+
+//! [3]
+static const char *vertexShaderSource =
+ "attribute highp vec4 posAttr;\n"
+ "attribute lowp vec4 colAttr;\n"
+ "varying lowp vec4 col;\n"
+ "uniform highp mat4 matrix;\n"
+ "void main() {\n"
+ " col = colAttr;\n"
+ " gl_Position = matrix * posAttr;\n"
+ "}\n";
+
+static const char *fragmentShaderSource =
+ "varying lowp vec4 col;\n"
+ "void main() {\n"
+ " gl_FragColor = col;\n"
+ "}\n";
+//! [3]
+
+//! [4]
+GLuint TriangleWindow::loadShader(GLenum type, const char *source)
+{
+ GLuint shader = glCreateShader(type);
+ glShaderSource(shader, 1, &source, 0);
+ glCompileShader(shader);
+ return shader;
+}
+
+void TriangleWindow::initialize()
+{
+ m_program = new QOpenGLShaderProgram(this);
+ m_program->addShaderFromSourceCode(QOpenGLShader::Vertex, vertexShaderSource);
+ m_program->addShaderFromSourceCode(QOpenGLShader::Fragment, fragmentShaderSource);
+ m_program->link();
+ m_posAttr = m_program->attributeLocation("posAttr");
+ m_colAttr = m_program->attributeLocation("colAttr");
+ m_matrixUniform = m_program->uniformLocation("matrix");
+}
+//! [4]
+
+//! [5]
+void TriangleWindow::render()
+{
+ glViewport(0, 0, width(), height());
+
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ m_program->bind();
+
+ QMatrix4x4 matrix;
+ matrix.perspective(60, 4.0/3.0, 0.1, 100.0);
+ matrix.translate(0, 0, -2);
+ matrix.rotate(100.0f * m_frame / screen()->refreshRate(), 0, 1, 0);
+
+ m_program->setUniformValue(m_matrixUniform, matrix);
+
+ GLfloat vertices[] = {
+ 0.0f, 0.707f,
+ -0.5f, -0.5f,
+ 0.5f, -0.5f
+ };
+
+ GLfloat colors[] = {
+ 1.0f, 0.0f, 0.0f,
+ 0.0f, 1.0f, 0.0f,
+ 0.0f, 0.0f, 1.0f
+ };
+
+ glVertexAttribPointer(m_posAttr, 2, GL_FLOAT, GL_FALSE, 0, vertices);
+ glVertexAttribPointer(m_colAttr, 3, GL_FLOAT, GL_FALSE, 0, colors);
+
+ glEnableVertexAttribArray(0);
+ glEnableVertexAttribArray(1);
+
+ glDrawArrays(GL_TRIANGLES, 0, 3);
+
+ glDisableVertexAttribArray(1);
+ glDisableVertexAttribArray(0);
+
+ m_program->release();
+
+ ++m_frame;
+}
+//! [5]
diff --git a/examples/gui/openglwindow/openglwindow.cpp b/examples/gui/openglwindow/openglwindow.cpp
new file mode 100644
index 0000000000..6a052c32e2
--- /dev/null
+++ b/examples/gui/openglwindow/openglwindow.cpp
@@ -0,0 +1,169 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the documentation 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 Nokia Corporation 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 "openglwindow.h"
+
+#include <QtCore/QCoreApplication>
+
+#include <QtGui/QOpenGLContext>
+#include <QtGui/QOpenGLPaintDevice>
+#include <QtGui/QPainter>
+
+//! [1]
+OpenGLWindow::OpenGLWindow(QWindow *parent)
+ : QWindow(parent)
+ , m_update_pending(false)
+ , m_animating(false)
+ , m_context(0)
+ , m_device(0)
+{
+ setSurfaceType(QWindow::OpenGLSurface);
+}
+//! [1]
+
+OpenGLWindow::~OpenGLWindow()
+{
+ delete m_device;
+}
+//! [2]
+void OpenGLWindow::render(QPainter *painter)
+{
+ Q_UNUSED(painter);
+}
+
+void OpenGLWindow::initialize()
+{
+}
+
+void OpenGLWindow::render()
+{
+ if (!m_device)
+ m_device = new QOpenGLPaintDevice;
+
+ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+
+ m_device->setSize(size());
+
+ QPainter painter(m_device);
+ render(&painter);
+}
+//! [2]
+
+//! [3]
+void OpenGLWindow::renderLater()
+{
+ if (!m_update_pending) {
+ m_update_pending = true;
+ QCoreApplication::postEvent(this, new QEvent(QEvent::UpdateRequest));
+ }
+}
+
+bool OpenGLWindow::event(QEvent *event)
+{
+ switch (event->type()) {
+ case QEvent::UpdateRequest:
+ renderNow();
+ return true;
+ default:
+ return QWindow::event(event);
+ }
+}
+
+void OpenGLWindow::exposeEvent(QExposeEvent *event)
+{
+ Q_UNUSED(event);
+
+ if (isExposed())
+ renderNow();
+}
+
+void OpenGLWindow::resizeEvent(QResizeEvent *event)
+{
+ Q_UNUSED(event);
+
+ if (isExposed())
+ renderNow();
+}
+//! [3]
+
+//! [4]
+void OpenGLWindow::renderNow()
+{
+ if (!isExposed())
+ return;
+
+ m_update_pending = false;
+
+ bool needsInitialize = false;
+
+ if (!m_context) {
+ m_context = new QOpenGLContext(this);
+ m_context->setFormat(requestedFormat());
+ m_context->create();
+
+ needsInitialize = true;
+ }
+
+ m_context->makeCurrent(this);
+
+ if (needsInitialize) {
+ initializeOpenGLFunctions();
+ initialize();
+ }
+
+ render();
+
+ m_context->swapBuffers(this);
+
+ if (m_animating)
+ renderLater();
+}
+//! [4]
+
+//! [5]
+void OpenGLWindow::setAnimating(bool animating)
+{
+ m_animating = animating;
+
+ if (animating)
+ renderLater();
+}
+//! [5]
+
diff --git a/examples/gui/openglwindow/openglwindow.h b/examples/gui/openglwindow/openglwindow.h
new file mode 100644
index 0000000000..aae797b680
--- /dev/null
+++ b/examples/gui/openglwindow/openglwindow.h
@@ -0,0 +1,83 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the documentation 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 Nokia Corporation 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 <QtGui/QWindow>
+#include <QtGui/QOpenGLFunctions>
+
+QT_BEGIN_NAMESPACE
+class QPainter;
+class QOpenGLContext;
+class QOpenGLPaintDevice;
+QT_END_NAMESPACE
+
+//! [1]
+class OpenGLWindow : public QWindow, protected QOpenGLFunctions
+{
+ Q_OBJECT
+public:
+ explicit OpenGLWindow(QWindow *parent = 0);
+ ~OpenGLWindow();
+
+ virtual void render(QPainter *painter);
+ virtual void render();
+
+ virtual void initialize();
+
+ void setAnimating(bool animating);
+
+public slots:
+ void renderLater();
+ void renderNow();
+
+protected:
+ bool event(QEvent *event);
+
+ void exposeEvent(QExposeEvent *event);
+ void resizeEvent(QResizeEvent *event);
+
+private:
+ bool m_update_pending;
+ bool m_animating;
+
+ QOpenGLContext *m_context;
+ QOpenGLPaintDevice *m_device;
+};
+//! [1]
+
diff --git a/examples/gui/openglwindow/openglwindow.pri b/examples/gui/openglwindow/openglwindow.pri
new file mode 100644
index 0000000000..45b0b0cd29
--- /dev/null
+++ b/examples/gui/openglwindow/openglwindow.pri
@@ -0,0 +1,3 @@
+INCLUDEPATH += $$PWD
+SOURCES += $$PWD/openglwindow.cpp
+HEADERS += $$PWD/openglwindow.h
diff --git a/examples/gui/openglwindow/openglwindow.pro b/examples/gui/openglwindow/openglwindow.pro
new file mode 100644
index 0000000000..c6b3f3c48a
--- /dev/null
+++ b/examples/gui/openglwindow/openglwindow.pro
@@ -0,0 +1,7 @@
+include(openglwindow.pri)
+
+OTHER_FILES += \
+ openglwindow.pri
+
+SOURCES += \
+ main.cpp