diff options
Diffstat (limited to 'tests/manual/examples/opengl/qopenglwindow')
7 files changed, 467 insertions, 0 deletions
diff --git a/tests/manual/examples/opengl/qopenglwindow/CMakeLists.txt b/tests/manual/examples/opengl/qopenglwindow/CMakeLists.txt new file mode 100644 index 0000000000..be3cb45152 --- /dev/null +++ b/tests/manual/examples/opengl/qopenglwindow/CMakeLists.txt @@ -0,0 +1,49 @@ +# Copyright (C) 2022 The Qt Company Ltd. +# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +cmake_minimum_required(VERSION 3.16) +project(qopenglwindow LANGUAGES CXX) + +if(NOT DEFINED INSTALL_EXAMPLESDIR) + set(INSTALL_EXAMPLESDIR "examples") +endif() + +set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/opengl/qopenglwindow") + +find_package(Qt6 REQUIRED COMPONENTS Core Gui OpenGL) + +qt_standard_project_setup() + +qt_add_executable(qopenglwindow + background_renderer.cpp background_renderer.h + main.cpp +) + +set_target_properties(qopenglwindow PROPERTIES + WIN32_EXECUTABLE TRUE + MACOSX_BUNDLE TRUE +) + +target_link_libraries(qopenglwindow PRIVATE + Qt6::Core + Qt6::Gui + Qt6::OpenGL +) + +# Resources: +set(shaders_resource_files + "background.frag" +) + +qt_add_resources(qopenglwindow "shaders" + PREFIX + "/" + FILES + ${shaders_resource_files} +) + +install(TARGETS qopenglwindow + RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}" + BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}" + LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}" +) diff --git a/tests/manual/examples/opengl/qopenglwindow/background.frag b/tests/manual/examples/opengl/qopenglwindow/background.frag new file mode 100644 index 0000000000..4af85aae8e --- /dev/null +++ b/tests/manual/examples/opengl/qopenglwindow/background.frag @@ -0,0 +1,30 @@ +#define M_PI 3.14159265358979323846 +#define SPEED 10000.0 + +uniform int currentTime; +uniform highp vec2 windowSize; + +highp float noise(highp vec2 co) +{ + return 0.5 * fract(sin(dot(co.xy, vec2(12.9898,78.233))) * 43758.5453); +} + +highp float curvSpeed() +{ + return (mod(float(currentTime), SPEED) / SPEED) * (2.0 * M_PI); +} + +highp float curv(int curvCount) +{ + highp float curv_y = 0.1 *(cos((gl_FragCoord.x / windowSize.x) * (float(curvCount * 2) * M_PI) - curvSpeed())) + 0.5; + highp float frag_y = gl_FragCoord.y / windowSize.y; + return 1.0 - abs(curv_y - frag_y); +} + +void main() +{ + highp float coordNoise = noise(gl_FragCoord.xy); + highp float proximity = smoothstep(0.85, 1.0, (curv(6) + 1.0) * (coordNoise )); + highp vec3 color = vec3(coordNoise) * proximity; + gl_FragColor = vec4(color, 1.0); +} diff --git a/tests/manual/examples/opengl/qopenglwindow/background_renderer.cpp b/tests/manual/examples/opengl/qopenglwindow/background_renderer.cpp new file mode 100644 index 0000000000..5939894dfe --- /dev/null +++ b/tests/manual/examples/opengl/qopenglwindow/background_renderer.cpp @@ -0,0 +1,167 @@ +// Copyright (C) 2016 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +#include "background_renderer.h" + +#include <qmath.h> +#include <QFileInfo> +#include <QTime> + +#include <QOpenGLShaderProgram> +#include <QOpenGLContext> +#include <QOpenGLFunctions> + +#include <math.h> + +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; +#if QT_CONFIG(filesystemwatcher) + m_watcher.addPath(info.canonicalPath()); + QObject::connect(&m_watcher, &QFileSystemWatcher::directoryChanged, this, &FragmentToy::fileChanged); +#endif + } +} + +FragmentToy::~FragmentToy() + = default; + +void FragmentToy::draw(const QSize &windowSize) +{ + if (!m_program) + initializeOpenGLFunctions(); + + glDisable(GL_STENCIL_TEST); + glDisable(GL_DEPTH_TEST); + + glClearColor(0, 0, 0, 1); + glClear(GL_COLOR_BUFFER_BIT); + if (!m_vao.isCreated()) + m_vao.create(); + + QOpenGLVertexArrayObject::Binder binder(&m_vao); + + 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.get())) { + qWarning() << "Failed to add vertex shader to program:" << m_program->log(); + } + } + + if (!m_fragment_shader && m_recompile_shaders) { + 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(nullptr); + } + } else { + qWarning() << "Unknown error, no fragment shader"; + } + + if (m_fragment_shader) { + if (!m_program->addShader(m_fragment_shader.get())) { + 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(); + } + + } + + if (!m_program->isLinked()) + return; + + m_program->bind(); + + m_vertex_buffer.bind(); + m_program->setAttributeBuffer("vertexCoord", GL_FLOAT, 0, 3, 0); + m_program->enableAttributeArray("vertexCoord"); + m_vertex_buffer.release(); + + m_program->setUniformValue("currentTime", (uint) QDateTime::currentMSecsSinceEpoch()); + m_program->setUniformValue("windowSize", windowSize); + + QOpenGLContext::currentContext()->functions()->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); + + m_program->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.get()); + m_fragment_shader.reset(nullptr); + } + } + } else { + m_recompile_shaders = true; + if (m_program) { + m_program->removeShader(m_fragment_shader.get()); + m_fragment_shader.reset(nullptr); + } + } +} diff --git a/tests/manual/examples/opengl/qopenglwindow/background_renderer.h b/tests/manual/examples/opengl/qopenglwindow/background_renderer.h new file mode 100644 index 0000000000..76c0bec6a8 --- /dev/null +++ b/tests/manual/examples/opengl/qopenglwindow/background_renderer.h @@ -0,0 +1,46 @@ +// Copyright (C) 2016 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +#ifndef FRAGMENT_TOY_H +#define FRAGMENT_TOY_H + +#include <QObject> +#include <QFile> +#include <QDateTime> +#if QT_CONFIG(filesystemwatcher) +#include <QFileSystemWatcher> +#endif +#include <QOpenGLVertexArrayObject> +#include <QOpenGLBuffer> +#include <QOpenGLShaderProgram> +#include <QOpenGLFunctions> + +#include <memory> + +class FragmentToy : public QObject, protected QOpenGLFunctions +{ + Q_OBJECT +public: + explicit FragmentToy(const QString &fragmentSource, QObject *parent = nullptr); + ~FragmentToy(); + + void draw(const QSize &windowSize); + +private: + void fileChanged(const QString &path); + bool m_recompile_shaders; +#if QT_CONFIG(filesystemwatcher) + QFileSystemWatcher m_watcher; +#endif + QString m_fragment_file; + QDateTime m_fragment_file_last_modified; + + std::unique_ptr<QOpenGLShaderProgram> m_program; + std::unique_ptr<QOpenGLShader> m_vertex_shader; + std::unique_ptr<QOpenGLShader> m_fragment_shader; + QOpenGLVertexArrayObject m_vao; + QOpenGLBuffer m_vertex_buffer; + GLuint m_vertex_coord_pos; +}; + +#endif //FRAGMENT_TOY_H diff --git a/tests/manual/examples/opengl/qopenglwindow/main.cpp b/tests/manual/examples/opengl/qopenglwindow/main.cpp new file mode 100644 index 0000000000..44810a4ecf --- /dev/null +++ b/tests/manual/examples/opengl/qopenglwindow/main.cpp @@ -0,0 +1,154 @@ +// Copyright (C) 2016 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +#include <QOpenGLWindow> +#include <QScreen> +#include <QPainter> +#include <QPainterPath> +#include <QGuiApplication> +#include <QMatrix4x4> +#include <QStaticText> +#include <QKeyEvent> + +#include "background_renderer.h" + +static QPainterPath painterPathForTriangle() +{ + static const QPointF bottomLeft(-1.0, -1.0); + static const QPointF top(0.0, 1.0); + static const QPointF bottomRight(1.0, -1.0); + + QPainterPath path(bottomLeft); + path.lineTo(top); + path.lineTo(bottomRight); + path.closeSubpath(); + return path; +} + +class OpenGLWindow : public QOpenGLWindow +{ + Q_OBJECT + +public: + OpenGLWindow(); + +protected: + void paintGL() override; + void resizeGL(int w, int h) override; + void keyPressEvent(QKeyEvent *e) override; + +private: + void setAnimating(bool enabled); + + QMatrix4x4 m_window_normalised_matrix; + QMatrix4x4 m_window_painter_matrix; + QMatrix4x4 m_projection; + QMatrix4x4 m_view; + QMatrix4x4 m_model_triangle; + QMatrix4x4 m_model_text; + + FragmentToy m_fragment_toy; + QStaticText m_text_layout; + bool m_animate; +}; + +// Use NoPartialUpdate. This means that all the rendering goes directly to +// the window surface, no additional framebuffer object stands in the +// middle. This is fine since we will clear the entire framebuffer on each +// paint. Under the hood this means that the behavior is equivalent to the +// manual makeCurrent - perform OpenGL calls - swapBuffers loop that is +// typical in pure QWindow-based applications. +OpenGLWindow::OpenGLWindow() + : QOpenGLWindow(QOpenGLWindow::NoPartialUpdate) + , m_fragment_toy("./background.frag") + , m_text_layout("The triangle and this text is rendered with QPainter") + , m_animate(true) +{ + setGeometry(300, 300, 500, 500); + + m_view.lookAt(QVector3D(3,1,1), + QVector3D(0,0,0), + QVector3D(0,1,0)); + + setAnimating(m_animate); +} + +void OpenGLWindow::paintGL() +{ + m_fragment_toy.draw(size()); + + QPainter p(this); + p.setWorldTransform(m_window_normalised_matrix.toTransform()); + + QMatrix4x4 mvp = m_projection * m_view * m_model_triangle; + p.setTransform(mvp.toTransform(), true); + + p.fillPath(painterPathForTriangle(), QBrush(QGradient(QGradient::NightFade))); + + QTransform text_transform = (m_window_painter_matrix * m_view * m_model_text).toTransform(); + p.setTransform(text_transform, false); + p.setPen(QPen(Qt::black)); + m_text_layout.prepare(text_transform); + qreal x = - (m_text_layout.size().width() / 2); + qreal y = 0; + p.drawStaticText(x, y, m_text_layout); + + m_model_triangle.rotate(-1, 0, 1, 0); + m_model_text.rotate(1, 0, 1, 0); +} + +void OpenGLWindow::resizeGL(int w, int h) +{ + m_window_normalised_matrix.setToIdentity(); + m_window_normalised_matrix.translate(w / 2.0, h / 2.0); + m_window_normalised_matrix.scale(w / 2.0, -h / 2.0); + + m_window_painter_matrix.setToIdentity(); + m_window_painter_matrix.translate(w / 2.0, h / 2.0); + + m_text_layout.setTextWidth(std::max(w * 0.2, 80.0)); + + m_projection.setToIdentity(); + m_projection.perspective(45.f, qreal(w) / qreal(h), 0.1f, 100.f); +} + +void OpenGLWindow::keyPressEvent(QKeyEvent *e) +{ + if (e->key() == Qt::Key_P) { // pause + m_animate = !m_animate; + setAnimating(m_animate); + } +} + +void OpenGLWindow::setAnimating(bool enabled) +{ + if (enabled) { + // Animate continuously, throttled by the blocking swapBuffers() call the + // QOpenGLWindow internally executes after each paint. Once that is done + // (frameSwapped signal is emitted), we schedule a new update. This + // obviously assumes that the swap interval (see + // QSurfaceFormat::setSwapInterval()) is non-zero. + connect(this, &QOpenGLWindow::frameSwapped, + this, QOverload<>::of(&QPaintDeviceWindow::update)); + update(); + } else { + disconnect(this, &QOpenGLWindow::frameSwapped, + this, QOverload<>::of(&QPaintDeviceWindow::update)); + } +} + +int main(int argc, char **argv) +{ + QGuiApplication app(argc, argv); + + OpenGLWindow window; + QSurfaceFormat fmt; + fmt.setDepthBufferSize(24); + fmt.setStencilBufferSize(8); + window.setFormat(fmt); + window.show(); + + return app.exec(); +} + +#include "main.moc" diff --git a/tests/manual/examples/opengl/qopenglwindow/qopenglwindow.pro b/tests/manual/examples/opengl/qopenglwindow/qopenglwindow.pro new file mode 100644 index 0000000000..e7073a324b --- /dev/null +++ b/tests/manual/examples/opengl/qopenglwindow/qopenglwindow.pro @@ -0,0 +1,16 @@ +TEMPLATE = app +TARGET = qopenglwindow +INCLUDEPATH += . +QT += opengl + +RESOURCES += shaders.qrc + +SOURCES += \ + main.cpp \ + background_renderer.cpp + +HEADERS += \ + background_renderer.h + +target.path = $$[QT_INSTALL_EXAMPLES]/opengl/qopenglwindow +INSTALLS += target diff --git a/tests/manual/examples/opengl/qopenglwindow/shaders.qrc b/tests/manual/examples/opengl/qopenglwindow/shaders.qrc new file mode 100644 index 0000000000..64eefe2c70 --- /dev/null +++ b/tests/manual/examples/opengl/qopenglwindow/shaders.qrc @@ -0,0 +1,5 @@ +<!DOCTYPE RCC><RCC version="1.0"> +<qresource> + <file>background.frag</file> +</qresource> +</RCC> |