Method valid

src/visualizer/gui/gui_manager.cpp:364–367

            glm::ivec2 render_size{0};

            [[nodiscard]] bool valid() const {
                return viewport != nullptr && size.x > 0.0f && size.y > 0.0f &&
                       render_size.x > 0 && render_size.y > 0;
            }
        };

        [[nodiscard]] glm::vec4 guideColor(const ImVec4& color, const float alpha) {