refactor: cleanup opengl

src/gui/viewport/ViewportGLWidget.h

@@ -0,0 +1,19 @@
+#include <GL/gl.h>
+#include <GL/glext.h>
+#include <QOpenGLWidget>
+#include <iostream>
+#include <QOpenGLFunctions_3_2_Core>
+
+class ViewportGLWidget : public QOpenGLWidget, protected QOpenGLFunctions_3_2_Core
+{
+public:
+    ViewportGLWidget(QWidget *parent) : QOpenGLWidget(parent) { }
+    QSize sizeHint() const override { return QSize(-1, -1); }
+    GLuint vao;
+    GLuint shaderProgram;
+
+protected:
+    void initializeGL() override;
+    void resizeGL(int w, int h) override;
+    void paintGL() override;
+};