feat: add opengl widget

src/gui/viewport/OpenGLWidget.h

@@ -0,0 +1,31 @@
+#include <QOpenGLWidget>
+#include <QOpenGLFunctions>
+
+class MyGLWidget : public QOpenGLWidget
+{
+public:
+    MyGLWidget(QWidget *parent) : QOpenGLWidget(parent) { }
+
+protected:
+    void initializeGL() override
+    {
+        // Set up the rendering context, load shaders and other resources, etc.:
+        QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
+        f->glClearColor(0.16f, 0.16f, 0.16f, 1.0f);
+    }
+
+    void resizeGL(int w, int h) override
+    {
+        // // Update projection matrix and other size related settings:
+        // m_projection.setToIdentity();
+        // m_projection.perspective(45.0f, w / float(h), 0.01f, 100.0f);
+    }
+
+    void paintGL() override
+    {
+        // Draw the scene:
+        QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
+        f->glClear(GL_COLOR_BUFFER_BIT);
+    }
+
+};