From f3b45ffa6159bc8b7ecfb0578bbb5cb826de1338 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Samuel=20R=C3=B8dal?= Date: Tue, 5 Jun 2012 13:21:55 +0200 Subject: Added OpenGL example and documentation. Change-Id: I2d9d4e52caf0a39fef9648d8a9e83a0c1328f650 Reviewed-by: Paul Olav Tvete --- examples/examples.pro | 1 + examples/gui/gui.pro | 2 +- examples/gui/openglwindow/main.cpp | 179 +++++++++++++++++++++++++++++ examples/gui/openglwindow/openglwindow.cpp | 169 +++++++++++++++++++++++++++ examples/gui/openglwindow/openglwindow.h | 83 +++++++++++++ examples/gui/openglwindow/openglwindow.pri | 3 + examples/gui/openglwindow/openglwindow.pro | 7 ++ 7 files changed, 443 insertions(+), 1 deletion(-) create mode 100644 examples/gui/openglwindow/main.cpp create mode 100644 examples/gui/openglwindow/openglwindow.cpp create mode 100644 examples/gui/openglwindow/openglwindow.h create mode 100644 examples/gui/openglwindow/openglwindow.pri create mode 100644 examples/gui/openglwindow/openglwindow.pro (limited to 'examples') 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 +#include +#include +#include + +#include + +//! [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 + +#include +#include +#include + +//! [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 +#include + +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 -- cgit v1.2.3