riangleInOneFile_Qt5OpenGLES20Cpp (with a link to a version in WebGL 1.0 and TypeScript), C++ (gcc)

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// Minimal OpenGL example that works on Notebook and Android
// Add to .pro file: win32: LIBS += -lopengl32

// Version in WebGL 1.0, TypeScript: https://plnkr.co/edit/gAfPR7ZIKjJXulDI?open=main.ts&preview

#ifdef _WIN32
#include <windows.h>
extern "C" __declspec(dllexport) DWORD NvOptimusEnablement = 0x00000001;
extern "C" __declspec(dllexport) DWORD AmdPowerXpressRequestHighPerformance = 0x00000001;
#endif

#include <QApplication>
#include <QOpenGLWidget>
#include <QOpenGLShaderProgram>
#include <QOpenGLBuffer>

class Widget : public QOpenGLWidget {
    Q_OBJECT
public:
    Widget(QWidget *parent = nullptr) : QOpenGLWidget(parent) { }
private:
    QOpenGLShaderProgram m_program;
    QOpenGLBuffer m_vertPosBuffer;

void initializeGL() override {
        glClearColor(0.5f, 0.8f, 0.7f, 1.f);
        resize(400, 500);
        const char *vertShaderSrc =
                "attribute vec3 aPosition"
                "void main()"
                "{"
                "    gl_Position = vec4(aPosition, 1.0);"
                "}";
        const char *fragShaderSrc =
                "void main()"
                "{"
                "    gl_FragColor = vec4(0.5, 0.2, 0.9, 1.0);"
                "}";
        m_program.addShaderFromSourceCode(QOpenGLShader::Vertex, vertShaderSrc);
        m_program.addShaderFromSourceCode(QOpenGLShader::Fragment, fragShaderSrc);
        m_program.link();
        m_program.bind();
        float vertPositions[] = {
            -0.5f, -0.5f, 0.f,
            0.5f, -0.5f, 0.f,
            0.f, 0.5f, 0.f
        };
        m_vertPosBuffer.create();
        m_vertPosBuffer.bind();
        m_vertPosBuffer.allocate(vertPositions, sizeof(vertPositions));
        m_program.bindAttributeLocation("aPosition", 0);
        m_program.setAttributeBuffer(0, GL_FLOAT, 0, 3);
        m_program.enableAttributeArray(0);
    }
    void paintGL() override {
        glClear(GL_COLOR_BUFFER_BIT);
        glDrawArrays(GL_TRIANGLES, 0, 3);
    }
    void resizeGL(int w, int h) override {
        glViewport(0, 0, w, h);
    }
};

#include "main.moc"

int main(int argc, char *argv[]) {
    QApplication a(argc, argv);
    Widget w;
    w.show();
    return a.exec();
}

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riangleInOneFile_Qt5OpenGLES20Cpp (with a link to a version in WebGL 1...