feat(viewport): basic proj and view matrix

src/gui/viewport/ViewportGLWidget.h

@@ -11,6 +11,7 @@ public:
     QSize sizeHint() const override { return QSize(-1, -1); }
     GLuint vao;
     GLuint shaderProgram;
+    float angle_ = 0.0f;
 
 protected:
     void initializeGL() override;