From e48737ae778b8ef5e8e905825a2787b97deea23d Mon Sep 17 00:00:00 2001 From: Laszlo Agocs Date: Thu, 20 Mar 2014 12:58:22 +0100 Subject: Introduce QOpenGLWindow [ChangeLog] Added QOpenGLWindow. This serves as a convenience class for creating windows showing OpenGL content via an API similar to QGLWidget and without any widget dependencies. Done-with: Jorgen Lind Task-number: QTBUG-36899 Change-Id: I52e9bc61acb129dbfd3841b3adeffab2dbcf7f05 Reviewed-by: Gunnar Sletta --- .../opengl/qopenglwindow/background_renderer.cpp | 201 +++++++++++++++++++++ 1 file changed, 201 insertions(+) create mode 100644 examples/opengl/qopenglwindow/background_renderer.cpp (limited to 'examples/opengl/qopenglwindow/background_renderer.cpp') diff --git a/examples/opengl/qopenglwindow/background_renderer.cpp b/examples/opengl/qopenglwindow/background_renderer.cpp new file mode 100644 index 0000000000..6cec6666b6 --- /dev/null +++ b/examples/opengl/qopenglwindow/background_renderer.cpp @@ -0,0 +1,201 @@ +/**************************************************************************** +** +** 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 "background_renderer.h" + +#include +#include +#include + +#include +#include +#include + +#include + +static const char vertex_shader[] = + "attribute highp vec3 vertexCoord;" + "void main() {" + " gl_Position = vec4(vertexCoord,1.0);" + "}"; + +static const char fragment_shader[] = + "void main() {" + " gl_FragColor = vec4(0.0,1.0,0.0,1.0);" + "}"; + +static const float vertices[] = { -1, -1, 0, + -1, 1, 0, + 1, -1, 0, + 1, 1, 0 }; + +FragmentToy::FragmentToy(const QString &fragmentSource, QObject *parent) + : QObject(parent) + , m_recompile_shaders(true) +{ + if (QFile::exists(fragmentSource)) { + QFileInfo info(fragmentSource); + m_fragment_file_last_modified = info.lastModified(); + m_fragment_file = fragmentSource; +#ifndef QT_NO_FILESYSTEMWATCHER + m_watcher.addPath(info.canonicalFilePath()); + QObject::connect(&m_watcher, &QFileSystemWatcher::fileChanged, this, &FragmentToy::fileChanged); +#endif + } +} + +void FragmentToy::draw(const QSize &windowSize) +{ + if (!m_program) + initializeOpenGLFunctions(); + + glDisable(GL_STENCIL_TEST); + glDisable(GL_DEPTH_TEST); + + glClearColor(0,0,0,0); + glClear(GL_COLOR_BUFFER_BIT); + if (!m_vao.isCreated()) + m_vao.create(); + + m_vao.bind(); + + if (!m_vertex_buffer.isCreated()) { + m_vertex_buffer.create(); + m_vertex_buffer.bind(); + m_vertex_buffer.allocate(vertices, sizeof(vertices)); + m_vertex_buffer.release(); + } + + if (!m_program) { + m_program.reset(new QOpenGLShaderProgram); + m_program->create(); + m_vertex_shader.reset(new QOpenGLShader(QOpenGLShader::Vertex)); + if (!m_vertex_shader->compileSourceCode(vertex_shader)) { + qWarning() << "Failed to compile the vertex shader:" << m_vertex_shader->log(); + } + if (!m_program->addShader(m_vertex_shader.data())) { + qWarning() << "Failed to add vertex shader to program:" << m_program->log(); + } + } + + if (!m_fragment_shader) { + QByteArray data; + if (m_fragment_file.size()) { + QFile file(m_fragment_file); + if (file.open(QIODevice::ReadOnly)) { + data = file.readAll(); + } else { + qWarning() << "Failed to load input file, falling back to default"; + data = QByteArray::fromRawData(fragment_shader, sizeof(fragment_shader)); + } + } else { + QFile qrcFile(":/background.frag"); + if (qrcFile.open(QIODevice::ReadOnly)) + data = qrcFile.readAll(); + else + data = QByteArray::fromRawData(fragment_shader, sizeof(fragment_shader)); + } + if (data.size()) { + m_fragment_shader.reset(new QOpenGLShader(QOpenGLShader::Fragment)); + if (!m_fragment_shader->compileSourceCode(data)) { + qWarning() << "Failed to compile fragment shader:" << m_fragment_shader->log(); + m_fragment_shader.reset(Q_NULLPTR); + } + } else { + qWarning() << "Unknown error, no fragment shader"; + } + + if (m_fragment_shader) { + if (!m_program->addShader(m_fragment_shader.data())) { + qWarning() << "Failed to add fragment shader to program:" << m_program->log(); + } + } + } + + if (m_recompile_shaders) { + m_recompile_shaders = false; + + if (m_program->link()) { + m_vertex_coord_pos = m_program->attributeLocation("vertexCoord"); + } else { + qWarning() << "Failed to link shader program" << m_program->log(); + } + + } + + m_program->bind(); + + m_vertex_buffer.bind(); + m_program->setAttributeBuffer("vertexCoord", GL_FLOAT, 0, 3, 0); + m_program->enableAttributeArray("vertexCoord"); + m_vertex_buffer.release(); + + float radiens = (QTime::currentTime().msecsSinceStartOfDay() / 60) / (2 * M_PI); + m_program->setUniformValue("currentTime", (uint) QDateTime::currentDateTime().toMSecsSinceEpoch()); + m_program->setUniformValue("radiens", radiens); + m_program->setUniformValue("windowSize", windowSize); + + QOpenGLContext::currentContext()->functions()->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); + + m_program->release(); + m_vao.release(); +} + +void FragmentToy::fileChanged(const QString &path) +{ + Q_UNUSED(path); + if (QFile::exists(m_fragment_file)) { + QFileInfo fragment_source(m_fragment_file); + if (fragment_source.lastModified() > m_fragment_file_last_modified) { + m_fragment_file_last_modified = fragment_source.lastModified(); + m_recompile_shaders = true; + if (m_program) { + m_program->removeShader(m_fragment_shader.data()); + m_fragment_shader.reset(Q_NULLPTR); + } + } + } else { + m_recompile_shaders = true; + if (m_program) { + m_program->removeShader(m_fragment_shader.data()); + m_fragment_shader.reset(Q_NULLPTR); + } + } +} -- cgit v1.2.3