Initial commit

OpenGLHandler.cpp

@@ -0,0 +1,481 @@
+#include <QImageReader>
+#include <QOpenGLFunctions>
+#include <QOpenGLBuffer>
+
+#include "OpenGLHandler.h"
+
+OpenGLHandler::OpenGLHandler() : _texture(QOpenGLTexture::Target2D)
+{
+    if(!_context.create())
+    {
+        qDebug() << "Can't create GL _context.";
+
+        return;
+    }
+    _surface.setFormat(_context.format());
+    _surface.create();
+
+    if(!_surface.isValid())
+    {
+        qDebug() << "_surface not valid.";
+
+        return;
+    }
+
+    if(!_context.makeCurrent(&_surface))
+    {
+        qDebug() << "Can't make _context current.";
+
+        return;
+    }
+    _image = new QImage("/home/mmt/Desktop/Projects/OpenGLOffscreen/sono.jpg");
+    _fbo = new QOpenGLFramebufferObject(_image->size());
+
+    _context.functions()->glViewport(0, 0, _image->width(), _image->height());
+    fun = new QOpenGLFunctions_3_3_Core();
+
+    if(!fun->initializeOpenGLFunctions())
+    {
+        qDebug() << "Can't init GL functions.";
+
+        return;
+    }
+    _shader = new QOpenGLShaderProgram(&_context);
+    loadChars();
+}
+
+bool OpenGLHandler::prepareShader(QString vertexShader, QString fragmentShader)
+{
+    if(!_shader->addCacheableShaderFromSourceCode(QOpenGLShader::Vertex, vertexShader))
+    {
+        qDebug() << "Can't add vertex shader.";
+
+        return false;
+    }
+    if(!_shader->addCacheableShaderFromSourceCode(QOpenGLShader::Fragment, fragmentShader))
+    {
+        qDebug() << "Can't add fragment shader.";
+
+        return {};
+    }
+    if(!_shader->link())
+    {
+        qDebug() << "Can't link program.";
+
+        return false;
+    }
+    if(!_shader->bind())
+    {
+        qDebug() << "Can't bind program.";
+
+        return false;
+    }
+
+    return true;
+}
+
+bool OpenGLHandler::prepareTexture(const QImage& image)
+{
+    _texture.setData(image);
+    _texture.bind();
+    if(!_texture.isBound())
+    {
+        qDebug() << "Texture not bound.";
+
+        return false;
+    }
+
+    return true;
+}
+
+bool OpenGLHandler::prepareCoords(QOpenGLBuffer vertexBuf, QOpenGLBuffer indexBuf)
+{
+    VertexData vertices[] =
+    {
+        {{ -0.5f, +0.5f }, { 0.0f, 0.0f }}, //top-left
+        {{ +0.5f, +0.5f }, { 1.0f, 0.0f }}, //top-right
+        {{ -0.5f, -0.5f }, { 0.0f, 1.0f }}, //bottom-left
+        {{ +0.5f, -0.5f }, { 1.0f, 1.0f }} //bottom-right
+//{{ -0.5f, +0.5f }, { 0.0f, 0.0f }}, //top-left
+//{{ +0.5f, +0.5f }, { 1.0f, 0.0f }}, //top-right
+//{{ -0.5f, -0.5f }, { 0.0f, 1.0f }}, //bottom-left
+//{{ +0.5f, -0.5f }, { 1.0f, 1.0f }} //bottom-right
+    };
+
+    GLuint indices[] =
+    {
+        0, 1, 2, 3
+    };
+
+    if(!vertexBuf.create())
+    {
+        qDebug() << "Can't create vertex buffer.";
+
+        return {};
+    }
+
+    if(!indexBuf.create())
+    {
+        qDebug() << "Can't create index buffer.";
+
+        return {};
+    }
+
+    if(!vertexBuf.bind())
+    {
+        qDebug() << "Can't bind vertex buffer.";
+
+        return {};
+    }
+    vertexBuf.allocate(vertices, 4 * sizeof(VertexData));
+    if(!indexBuf.bind())
+    {
+        qDebug() << "Can't bind index buffer.";
+
+        return {};
+    }
+    indexBuf.allocate(indices, 4 * sizeof(GLuint));
+
+    return true;
+}
+
+void OpenGLHandler::loadChars()
+{
+    if(FT_Init_FreeType(&_ft))
+    {
+        qDebug() << "ERROR::FREETYPE: Could not init FreeType Library";
+    }
+
+    if(FT_New_Face(_ft, "/home/mmt/.fonts/Roboto-Black.ttf", 0, &_face))
+    {
+        qDebug() << "ERROR::FREETYPE: Failed to load font";
+    }
+    FT_Set_Pixel_Sizes(_face, 0, 48);
+    if(FT_Load_Char(_face, 'X', FT_LOAD_RENDER))
+    {
+        qDebug() << "ERROR::FREETYTPE: Failed to load Glyph";
+    }
+
+    glPixelStorei(GL_UNPACK_ALIGNMENT, 1); //disable byte-alignment restriction
+
+    int i = 0;
+    for(unsigned char c = 0; c < 128; c++)
+    {
+        //load character glyph
+        if(FT_Load_Char(_face, c, FT_LOAD_RENDER))
+        {
+            qDebug() << "ERROR::FREETYTPE: Failed to load Glyph\n";
+            continue;
+        }
+//// generate texture
+        unsigned int texture;
+        glGenTextures(1, &texture);
+        glBindTexture(GL_TEXTURE_2D, texture);
+        glTexImage2D(
+            GL_TEXTURE_2D,
+            0,
+            GL_RED,
+            _face->glyph->bitmap.width,
+            _face->glyph->bitmap.rows,
+            0,
+            GL_RED,
+            GL_UNSIGNED_BYTE,
+            _face->glyph->bitmap.buffer
+            );
+//qDebug() << _face->glyph->bitmap.palette_mode;
+//QImage chImage(_face->glyph->bitmap.buffer, _face->glyph->bitmap.width,
+//_face->glyph->bitmap.rows,
+//QImage::Format::Format_Grayscale8);
+//chImage.save("/home/mmt/Desktop/chr/" + static_cast<QString>(i++) + ".png");
+
+//// set texture options
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+        //now store character for later use
+        Character character = {
+            texture,
+            glm::ivec2(_face->glyph->bitmap.width, _face->glyph->bitmap.rows),
+            glm::ivec2(_face->glyph->bitmap_left, _face->glyph->bitmap_top),
+            _face->glyph->advance.x
+        };
+        _characters.insert(c, character);
+    }
+    glBindTexture(GL_TEXTURE_2D, 0);
+    FT_Done_Face(_face);
+    FT_Done_FreeType(_ft);
+}
+
+void OpenGLHandler::processText()
+{
+    QString vertexShadre =
+        "#version 330 core\n"
+        "layout (location = 4) in vec4 vertex;"
+        "out vec2 TexCoords;"
+        "uniform mat4 projection;"
+        "void main()"
+        "{"
+        "    gl_Position = projection * vec4(vertex.xy, 0.0, 1.0);"
+        "    TexCoords.x = vertex.z;"
+        "    TexCoords.y = vertex.w;"
+        "}";
+    QString fragShadre =
+        "#version 330 core\n"
+        "in vec2 TexCoords;"
+        "out vec4 color;"
+        "uniform sampler2D text;"
+        "uniform vec3 textColor;"
+        "void main()"
+        "{"
+        "    vec4 sampled = vec4(1.0, 1.0, 1.0, texture(text, TexCoords).r);"
+        "    color = vec4(textColor, 1.00) * sampled;"
+        "}";
+    prepareShader(vertexShadre, fragShadre);
+//_shader->link();
+//_shader->bind();
+//fun->glEnable(GL_CULL_FACE);
+    fun->glEnable(GL_BLEND);
+//glBlendFunc(GL_ONE, GL_ZERO);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    QMatrix4x4 qProjection;
+    QRect temp(0.0f, static_cast<float>(320), 0.0f, static_cast<float>(480));
+    qProjection.ortho(temp);
+    _shader->setUniformValueArray(_shader->uniformLocation("projection"), &qProjection, 1);
+    fun->glGenVertexArrays(1, &chVAO);
+    fun->glGenBuffers(1, &chVBO);
+    fun->glBindVertexArray(chVAO);
+    fun->glBindBuffer(GL_ARRAY_BUFFER, chVBO);
+    fun->glBufferData(GL_ARRAY_BUFFER, sizeof(float) * 6 * 4, NULL, GL_DYNAMIC_DRAW);
+    fun->glEnableVertexAttribArray(4);
+    fun->glVertexAttribPointer(4, 4, GL_FLOAT, GL_FALSE, 4 * sizeof(float), 0);
+    fun->glBindBuffer(GL_ARRAY_BUFFER, 0);
+    fun->glBindVertexArray(0);
+
+    RenderText("This is sample text", -0.8f, -.8f, .003f, glm::vec3(0.5, 0.8f, 0.2f));
+    RenderText("(C) LearnOpenGL.com", -0.5f, 0.00f, 0.005f, glm::vec3(0.3, 0.7f, 0.9f));
+    //glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
+    //-------------------------------------------------------------------------------
+//glfwSwapBuffers(_window);
+//glfwPollEvents();
+    auto log = _shader->log();
+    if(log != "")
+    {
+        qDebug() << "log : " << log;
+    }
+
+    fun->glDeleteVertexArrays(1, &chVAO);
+    fun->glDeleteBuffers(1, &chVBO);
+    _shader->removeAllShaders();
+    fun->glDisable(GL_BLEND);
+    glDisable(GL_CULL_FACE);
+}
+
+void OpenGLHandler::RenderText(std::string text, float x, float y, float scale, glm::vec3 color)
+{
+    //activate corresponding render state
+    _shader->setUniformValue(_shader->uniformLocation("textColor"), color.x, color.y, color.z);
+    glActiveTexture(GL_TEXTURE0);
+    fun->glBindVertexArray(chVAO);
+
+    //iterate through all characters
+    std::string::const_iterator c;
+    for(c = text.begin(); c != text.end(); c++)
+    {
+//qDebug() << "here";
+        Character ch = _characters[*c];
+
+        float xpos = x + ch.Bearing.x * scale;
+        float ypos = y - (ch.Size.y - ch.Bearing.y) * scale;
+        //qDebug() << "xpos = " << xpos;
+        float w = ch.Size.x * scale;
+        float h = ch.Size.y * scale;
+//qDebug() << ypos + h;
+        //update VBO for each character
+        float vertices[6][4] = {
+            { xpos, ypos + h, 0.0f, 0.0f },
+            { xpos, ypos, 0.0f, 1.0f },
+            { xpos + w, ypos, 1.0f, 1.0f },
+
+            { xpos, ypos + h, 0.0f, 0.0f },
+            { xpos + w, ypos, 1.0f, 1.0f },
+            { xpos + w, ypos + h, 1.0f, 0.0f }
+        };
+        //render glyph texture over quad
+        glBindTexture(GL_TEXTURE_2D, ch.TextureID);
+        //update content of VBO memory
+        fun->glBindBuffer(GL_ARRAY_BUFFER, chVBO);
+        fun->glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertices), vertices); //be sure to use
+        //glBufferSubData and not
+        //glBufferData
+
+        fun->glBindBuffer(GL_ARRAY_BUFFER, 0);
+        //render quad
+        glDrawArrays(GL_TRIANGLES, 0, 6);
+        //now advance cursors for next glyph (note that advance is number of 1/64 pixels)
+        x += (ch.Advance >> 6) * scale; //bitshift by 6 to get value in pixels (2^6 = 64 (divide
+                                        //amount of 1/64th pixels by 64 to get amount of pixels))
+    }
+    fun->glBindVertexArray(0);
+    glBindTexture(GL_TEXTURE_2D, 0);
+}
+
+bool OpenGLHandler::prepareCoords2(QOpenGLBuffer vertexBuf, QOpenGLBuffer indexBuf)
+{
+    VertexData vertices[] =
+    {
+        {{ -1.0f, +1.0f }, { 0.0f, 1.0f }}, //top-left
+        {{ +1.0f, +1.0f }, { 1.0f, 1.0f }},     //top-right
+        {{ -1.0f, -1.0f }, { 0.0f, 0.0f }},     //bottom-left
+        {{ +1.0f, -1.0f }, { 1.0f, 0.0f }}      //bottom-right
+    };
+
+    GLuint indices[] =
+    {
+        0, 1, 2, 3
+    };
+
+    if(!vertexBuf.create())
+    {
+        qDebug() << "Can't create vertex buffer.";
+
+        return {};
+    }
+
+    if(!indexBuf.create())
+    {
+        qDebug() << "Can't create index buffer.";
+
+        return {};
+    }
+
+    if(!vertexBuf.bind())
+    {
+        qDebug() << "Can't bind vertex buffer.";
+
+        return {};
+    }
+    vertexBuf.allocate(vertices, 4 * sizeof(VertexData));
+    if(!indexBuf.bind())
+    {
+        qDebug() << "Can't bind index buffer.";
+
+        return {};
+    }
+    indexBuf.allocate(indices, 4 * sizeof(GLuint));
+
+    return true;
+}
+
+QString OpenGLHandler::getImage(QImage img)
+{
+    QByteArray byteArray;
+    QBuffer buffer(&byteArray);
+    buffer.open(QIODevice::WriteOnly);
+    img.save(&buffer, "png");
+    //save image data in string
+    QString image("data:image/png;base64,");
+    image.append(QString::fromLatin1(byteArray.toBase64().data()));
+
+    return image;
+}
+
+OpenGLHandler::~OpenGLHandler()
+{
+    delete _image;
+    delete _fbo;
+    delete _shader;
+}
+
+void OpenGLHandler::processImage(const QImage& image,
+                                 const QString& vertexShader,
+                                 const QString& fragmentShader,
+                                 const QString& textureVar,
+                                 const QString& vertexPosVar,
+                                 const QString& textureCoordVar)
+{
+//fun->glEnable(GL_BLEND);
+    bool a;
+    QOpenGLBuffer vertexBuf(QOpenGLBuffer::VertexBuffer);
+    QOpenGLBuffer indexBuf(QOpenGLBuffer::IndexBuffer);
+    a = prepareShader(vertexShader, fragmentShader);
+    a = prepareTexture(image);
+    a = prepareCoords(vertexBuf, indexBuf);
+
+    int offset = 0;
+    _shader->enableAttributeArray(vertexPosVar.toLatin1().data());
+    _shader->setAttributeBuffer(vertexPosVar.toLatin1().data(), GL_FLOAT, offset, 2,
+                                sizeof(VertexData));
+    offset += sizeof(QVector2D);
+    _shader->enableAttributeArray(textureCoordVar.toLatin1().data());
+    _shader->setAttributeBuffer(textureCoordVar.toLatin1().data(), GL_FLOAT, offset, 2,
+                                sizeof(VertexData));
+
+    _shader->setUniformValue(textureVar.toLatin1().data(), 0);
+
+    fun->glDrawElements(GL_TRIANGLE_STRIP, 4, GL_UNSIGNED_INT, Q_NULLPTR);
+
+    _shader->disableAttributeArray(vertexPosVar.toLatin1().data());
+    _shader->disableAttributeArray(textureCoordVar.toLatin1().data());
+    _shader->disableAttributeArray(textureVar.toLatin1().data());
+
+    _shader->removeAllShaders();
+}
+
+void OpenGLHandler::flipImage()
+{
+    QString textureVar = "texture";
+    QString vertexPosVar = "aPosition";
+    QString textureCoordVar = "aTexCoord";
+    QString flipVertexShader =
+        "attribute vec4 aPosition;\n"
+        "attribute vec2 aTexCoord;\n"
+        "varying vec2 vTexCoord;\n"
+        "void main()\n"
+        "{\n"
+        "   gl_Position = aPosition;\n"
+        "   vTexCoord.x = -aTexCoord.x;\n"
+        "   vTexCoord.y = aTexCoord.y;\n"
+        "}";
+    QString flipFragmentShader =
+        "uniform sampler2D texture;\n"
+        "varying vec2 vTexCoord;\n"
+        "void main()\n"
+        "{\n"
+        "   gl_FragColor = texture2D(texture, vTexCoord);\n"
+        "}";
+    prepareShader(flipVertexShader, "");
+    QOpenGLBuffer vertexBuf(QOpenGLBuffer::VertexBuffer);
+    QOpenGLBuffer indexBuf(QOpenGLBuffer::IndexBuffer);
+    prepareCoords2(vertexBuf, indexBuf);
+
+    int offset = 0;
+    _shader->enableAttributeArray(vertexPosVar.toLatin1().data());
+    _shader->setAttributeBuffer(vertexPosVar.toLatin1().data(), GL_FLOAT, offset, 2,
+                                sizeof(VertexData));
+    offset += sizeof(QVector2D);
+    _shader->enableAttributeArray(textureCoordVar.toLatin1().data());
+    _shader->setAttributeBuffer(textureCoordVar.toLatin1().data(), GL_FLOAT, offset, 2,
+                                sizeof(VertexData));
+
+    _shader->setUniformValue(textureVar.toLatin1().data(), 0);
+    fun->glDrawElements(GL_TRIANGLE_STRIP, 4, GL_UNSIGNED_INT, Q_NULLPTR);
+    _shader->disableAttributeArray(vertexPosVar.toLatin1().data());
+    _shader->disableAttributeArray(textureCoordVar.toLatin1().data());
+    _shader->disableAttributeArray(textureVar.toLatin1().data());
+    _shader->removeAllShaders();
+}
+
+void OpenGLHandler::run()
+{
+//fun->glClearColor(0, 1, 1, 1);
+//fun->glClear(GL_COLOR_BUFFER_BIT);
+    processImage(*_image, vertexShader, fragmentShader, "texture", "aPosition",
+                 "aTexCoord");
+    processText();
+//flipImage();
+    auto ret = _fbo->toImage(true);
+//auto address = getImage(ret);
+
+    ret.save("/home/mmt/Desktop/test.png");
+}

OpenGLHandler.h

@@ -0,0 +1,90 @@
+#ifndef OPENGLHANDLER_H
+#define OPENGLHANDLER_H
+
+#include <QtCore>
+#include <QImage>
+#include <QOpenGLContext>
+#include <QOffscreenSurface>
+#include <QOpenGLFramebufferObject>
+#include <QOpenGLShaderProgram>
+#include <QOpenGLTexture>
+#include <QOpenGLBuffer>
+#include <ft2build.h>
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+#include <QtGui/QOpenGLFunctions_3_3_Core>
+
+#include FT_FREETYPE_H
+
+struct VertexData
+{
+    QVector2D position;
+    QVector2D texCoord;
+};
+
+struct Character {
+    unsigned int TextureID;  //ID handle of the glyph texture
+    glm::ivec2 Size;         //Size of glyph
+    glm::ivec2 Bearing;      //Offset from baseline to left/top of glyph
+    long Advance;    //Offset to advance to next glyph
+};
+
+class OpenGLHandler
+{
+public:
+    OpenGLHandler();
+    ~OpenGLHandler();
+
+    void run();
+    void processImage(const QImage& image,
+                      const QString& vertexShader,
+                      const QString& fragmentShader,
+                      const QString& textureVar,
+                      const QString& vertexPosVar,
+                      const QString& textureCoordVar);
+
+private:
+    QOpenGLFunctions_3_3_Core* fun;
+    QOpenGLContext _context;
+    QOffscreenSurface _surface;
+    QOpenGLFramebufferObject* _fbo;
+    QImage* _image;
+    QOpenGLShaderProgram* _shader;
+    QOpenGLTexture _texture;
+    FT_Library _ft;
+    FT_Face _face;
+    QMap<char, Character> _characters;
+
+    QString vertexShader =
+        "attribute vec4 aPosition;\n"
+        "attribute vec2 aTexCoord;\n"
+        "varying vec2 vTexCoord;\n"
+        "void main()\n"
+        "{\n"
+        "   gl_Position = aPosition;\n"
+        "   vTexCoord = aTexCoord;\n"
+        "}";
+
+    QString fragmentShader =
+        "uniform sampler2D texture;\n"
+        "varying vec2 vTexCoord;\n"
+        "void main()\n"
+        "{\n"
+        "   gl_FragColor = texture2D(texture, vTexCoord);\n"
+        "}";
+
+    unsigned int chVAO, chVBO;
+    bool prepareShader(QString vertexShader, QString fragmentShader);
+    bool prepareTexture(const QImage& image);
+    bool prepareCoords(QOpenGLBuffer vertexBuf, QOpenGLBuffer indexBuf);
+
+    void loadChars();
+    void processText();
+    void RenderText(std::string text, float x, float y, float scale, glm::vec3 color);
+    bool prepareCoords2(QOpenGLBuffer vertexBuf, QOpenGLBuffer indexBuf);
+    void flipImage();
+    QString getImage(QImage img);
+};
+
+#endif //OPENGLHANDLER_H

OpenGLOffscreen.pro

@@ -0,0 +1,38 @@
+QT += quick
+
+CONFIG += c++11
+
+# The following define makes your compiler emit warnings if you use
+# any Qt feature that has been marked deprecated (the exact warnings
+# depend on your compiler). Refer to the documentation for the
+# deprecated API to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+# You can also make your code fail to compile if it uses deprecated APIs.
+# In order to do so, uncomment the following line.
+# You can also select to disable deprecated APIs only up to a certain version of Qt.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
+SOURCES += \
+        OpenGLHandler.cpp \
+        main.cpp
+
+RESOURCES += qml.qrc
+
+# Additional import path used to resolve QML modules in Qt Creator's code model
+QML_IMPORT_PATH =
+
+# Additional import path used to resolve QML modules just for Qt Quick Designer
+QML_DESIGNER_IMPORT_PATH =
+
+# Default rules for deployment.
+qnx: target.path = /tmp/$${TARGET}/bin
+else: unix:!android: target.path = /opt/$${TARGET}/bin
+!isEmpty(target.path): INSTALLS += target
+
+HEADERS += \
+    OpenGLHandler.h
+
+unix|win32: LIBS += -lfreetype
+
+unix|win32: LIBS += -lglfw

OpenGLOffscreen.pro.user

@@ -0,0 +1,335 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE QtCreatorProject>
+<!-- Written by QtCreator 4.10.1, 2021-05-18T14:05:05. -->
+<qtcreator>
+ <data>
+  <variable>EnvironmentId</variable>
+  <value type="QByteArray">{b555296d-4153-4375-9ee0-d02c6b22be92}</value>
+ </data>
+ <data>
+  <variable>ProjectExplorer.Project.ActiveTarget</variable>
+  <value type="int">0</value>
+ </data>
+ <data>
+  <variable>ProjectExplorer.Project.EditorSettings</variable>
+  <valuemap type="QVariantMap">
+   <value type="bool" key="EditorConfiguration.AutoIndent">true</value>
+   <value type="bool" key="EditorConfiguration.AutoSpacesForTabs">false</value>
+   <value type="bool" key="EditorConfiguration.CamelCaseNavigation">true</value>
+   <valuemap type="QVariantMap" key="EditorConfiguration.CodeStyle.0">
+    <value type="QString" key="language">Cpp</value>
+    <valuemap type="QVariantMap" key="value">
+     <value type="QByteArray" key="CurrentPreferences">CppGlobal</value>
+    </valuemap>
+   </valuemap>
+   <valuemap type="QVariantMap" key="EditorConfiguration.CodeStyle.1">
+    <value type="QString" key="language">QmlJS</value>
+    <valuemap type="QVariantMap" key="value">
+     <value type="QByteArray" key="CurrentPreferences">QmlJSGlobal</value>
+    </valuemap>
+   </valuemap>
+   <value type="int" key="EditorConfiguration.CodeStyle.Count">2</value>
+   <value type="QByteArray" key="EditorConfiguration.Codec">UTF-8</value>
+   <value type="bool" key="EditorConfiguration.ConstrainTooltips">false</value>
+   <value type="int" key="EditorConfiguration.IndentSize">4</value>
+   <value type="bool" key="EditorConfiguration.KeyboardTooltips">false</value>
+   <value type="int" key="EditorConfiguration.MarginColumn">80</value>
+   <value type="bool" key="EditorConfiguration.MouseHiding">true</value>
+   <value type="bool" key="EditorConfiguration.MouseNavigation">true</value>
+   <value type="int" key="EditorConfiguration.PaddingMode">1</value>
+   <value type="bool" key="EditorConfiguration.ScrollWheelZooming">true</value>
+   <value type="bool" key="EditorConfiguration.ShowMargin">false</value>
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+</qtcreator>

main.cpp

@@ -0,0 +1,27 @@
+#include <QGuiApplication>
+#include <QQmlApplicationEngine>
+
+#include "OpenGLHandler.h"
+
+int main(int argc, char* argv[])
+{
+    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+
+    QGuiApplication app(argc, argv);
+
+    QQmlApplicationEngine engine;
+    const QUrl url(QStringLiteral("qrc:/main.qml"));
+    QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
+                     &app, [url](QObject* obj, const QUrl& objUrl) {
+        if(!obj && url == objUrl)
+        {
+            QCoreApplication::exit(-1);
+        }
+    }, Qt::QueuedConnection);
+    engine.load(url);
+
+    OpenGLHandler op;
+    op.run();
+
+    return app.exec();
+}

main.qml

@@ -0,0 +1,9 @@
+import QtQuick 2.13
+import QtQuick.Window 2.13
+
+Window {
+    visible: true
+    width: 640
+    height: 480
+    title: qsTr("Hello World")
+}

qml.qrc

@@ -0,0 +1,5 @@
+<RCC>
+    <qresource prefix="/">
+        <file>main.qml</file>
+    </qresource>
+</RCC>